Best Crucible Act 3 Summary

Best Crucible Act 3 Summary SAT / ACT Prep Online Guides and Tips In Act 3 of The Crucible, we meet the judges who have been conducting the witch trials. John Proctor and Mary Warren finally confront the court with the truth, but, as you'll see, the truth has limited currency when it doesn't align with what people have already chosen to believe. I'll include short and long summaries of Act 3, a list of the most important quotes, and a thematic analysis covering the events of this part of the play. The Crucible Act 3 Summary - Short Version Judge Hathorne is questioning Martha Corey off-stage. Giles Corey interrupts the proceedings to defend his wife, and he is dragged into a room off of the court (on stage) by Marshal Herrick. They are accompanied by Judge Hathorne, Governor Danforth, Reverend Parris and Reverend Hale, Francis Nurse, and Ezekiel Cheever. After a short discussion where the truth of the accusers’ claims is disputed by Francis Nurse and Giles Corey, Mary Warren and John Proctor enter the room. Mary admits to Danforth that she and the other girls were faking the whole time. Danforth is not convinced that this is the truth based on the evidence of witchcraft he's seen in court (people being choked by familiar spirits and slashed with daggers). Proctor presents a petition signed by 91 people who are willing to vouch for the good character of Elizabeth Proctor, Rebecca Nurse, and Martha Corey. Danforth orders warrants drawn up for all the people who signed the petition. Proctor then presents a statement from Giles Corey where Corey testifies that Thomas Putnam encouraged his daughter, Ruth Putnam, to make accusations against George Jacobs so Putnam could snatch up Jacobs’ land.However, Giles refuses to reveal who gave him this information, so he is arrested for contempt of court and his accusations are dismissed. Finally, Proctor gives Danforth Mary Warren’s statement where she admits in writing that she and the other girls were faking. The girls are brought in from the courtroom for questioning by Danforth. Abigail denies Mary’s accusations.The judges doubt Mary even more when she is unable to pretend to faint like she says she did in the courtroom. Abigail then says she feels a spirit in the room, which enrages Proctor. He calls her a whore and admits that they had an affair so that she will be discredited. Danforth brings Elizabeth Proctor in for questioning on this issue, but she covers up the affair to protect John’s reputation. She is unaware that he has already confessed. John’s accusations are subsequently dismissed. Abigail claims to see a bird on the rafters that she insists is Mary Warren’s spirit poised to attack her. The other girls follow Abigail’s lead and gang up on Mary. A terrified Mary breaks down under the pressure of these accusations and confesses that John forced her to work for the Devil. Proctor and Corey are arrested, and Hale quits the court in disgust at this blatant display of irrationality. You probably saw this coming. John Proctor wasn't going to get away with being so Devilishly handsome for much longer (ew sorry). The Crucible Act 3 Summary - Long Version This act takes place in the vestry room of Salem meeting house, which is right outside the courtroom.The audience hears Judge Hathorne questioning Martha Corey off stage (in court).He asks her a series of leading questions in an attempt to get her to confess to witchcraft.Giles Corey tries to interrupt, claiming that the accusations are just a product of Thomas Putnam’s greed for land.Giles is dragged from the courtroom and into the vestry room (on stage) by Marshal Herrick. They arefollowed by Francis Nurse, Reverend Hale, Judge Hathorne, Deputy Governor Danforth, Ezekiel Cheever and Reverend Parris.Danforth admonishes Giles for interrupting the court proceedings. He insists that if Giles wishes to submit evidence in his wife’s defense, he must follow procedure and submit an affidavit.Francis Nurse says he has proof that the girls are frauds.This claim is disturbing to Danforth because he has already condemned many people based on their testimony. At this time, John Proctor leads Mary Warren into the vestry room.Mary doesn’t speak at first, but Proctor tells Danforth that she has signed a deposition indicating that she never saw any spirits.Mary hesitantly tells Danforth that the girls were faking the whole time.Danforth warns Proctor that he had better be sure this new evidence is truthful and questions him about his intentions.Proctor says he has no desire to undermine the court, and his only goal is to save his wife. Cheever reveals that Proctor tore up the arrest warrant when they came to take his wife, and Danforth becomes suspicious again.He asks Proctor a couple of questions about his religious devotion and his lapses in church attendance, and Proctor reiterates that he hasn’t been to church lately because he hates Parris.Danforth still feels that the girls must be telling the truth because he's seen them stabbed with pins and choked by spirits in court.Proctor counters by pointing out how weird it is that all these people who always had great reputations are now suddenly being accused of witchcraft.Danforth and Hawthorne then tell John that Elizabeth is pregnant, meaning they will spare her at least until the child is born.Proctor refuses to drop his accusations of perjury against the girls even though his wife is safe.His friends' wives are still in danger, and he is determined to expose Abigail as a liar. Danforth agrees to look at Proctor’s evidence, which is a petition signed by 91 respectable people testifying to Rebecca Nurse, Martha Corey, and Elizabeth Proctor’s good characters.Parris insists that those who signed the petition should be summoned for questioning.Danforth orders warrants drawn up for their arrest, to the horror of Francis Nurse, who promised the people who signed the petition that there would be no negative repercussions for them.Danforth says they should have nothing to fear if they’re truly good Christians. Proctor then gives Danforth Giles Corey’s deposition.Corey says that Putnam told his daughter, Ruth, to accuse George Jacobs of witchcraft so Putnam could take Jacobs’ land.However, Corey refuses to tell Danforth the name of the person who gave him this information, and when Putnam is asked directly, he denies it. Hale says that Giles can’t be faulted for preserving the anonymity of his informant because everyone in town is terrified of the court.Danforth insists that innocent people have no reason to be afraid.Giles is placed under arrest for contempt of court. Proctor tries to calm everyone down and gives Mary Warren’s deposition to Danforth.It states that she never saw the Devil or any other spirits, and the other girls are lying.Before Danforth takes the deposition, Hale tries to talk him into letting a lawyer argue Proctor’s evidence in court rather than asking Proctor to defend it alone.Danforth says witchcraft is an invisible crime, so the witch and the victim are the only real witnesses.That means only the victim is left for reliable testimony in court (since obviously the witch can't be trusted), so lawyers are unnecessary. Upon reading the deposition, Danforth asks Mary if Proctor threatened her to get her to change her testimony.Mary says no, she is telling the truth now.Danforth orders the other girls brought into the room.Danforth informs them of the charges Mary has made against them, andAbigail denies Mary’s accusations vehemently.Proctor points out that there’s no reason for Mary to make these claims unless she’s telling the truth. Heurges Mary to tell Danforth about the girls dancing in the woods.Parris is forced to admit that he discovered them dancing, and Hale corroborates.Danforth is disturbed by this information and becomes less trusting of Abigail. Hathorne then questions Mary about her past behavior in court in light of her new testimony.Mary says she was faking when she fainted in court before.Hathorne and Parris tell Mary to pretend to faint again right now if she’s such a good actress.Mary is unable to pretend to faint outside of the courtroom environment. Danforth asks Abigail if it’s possible that the spirits could have been all in her head.Abigail is insulted by these accusations, pointing out how much she has suffered at the hands of witches.She stops talking suddenly and claims to feel a spirit in the room.The other girls imitate her.Danforth buys into the act and immediately suspects Mary of witchcraft, which is Abigail’s intention.Mary tries to run away, fearing for her life if the other girls accuse her.Proctor stops Mary from leaving and grabs Abigail by the hair in fury, calling her a whore.He admits to their affair and explains that Abigail accused his wife of witchcraft because she wants to be with him.Danforth is horrified, and Abigail refuses to respond to the accusations, which disturbs Danforth even further. Danforth orders Elizabeth Proctor brought in for questioning on this issue after John insists that Elizabeth is incapable of lying.John and Abigail are both forced to turn their backs to her as she is questioned, so she doesn't know that John has already confessed to the affair.Elizabeth says she dismissed Abigail because she was suspicious of Abigail’s close relationship with her husband. When questioned further, she lies and says that her suspicions were unfounded to protect John's reputation. Danforth takes this as proof that Proctor is lying about the affair and dismisses Elizabeth.Hale points out that it makes complete sense that Elizabeth would lie to protect her husband’s reputation. He believes Proctor is telling the truth. Abigail prevents further rational conversation by pretending to see and talk to a bird that she claims is Mary Warren’s spirit.All the girls start repeating everything Mary says.Danforth once again is convinced by this charade.He pressures Mary to confess that she’s in league with the Devil.Mary is terrified for her life, so she blurts out that Proctor is the Devil’s man and has coerced her into witchcraft (to be fair, he did pressure her into changing her testimony).Danforth asks Proctor a couple of accusatory questions. Proctor condemns Danforth for contributing to fear and ignorance by failing to expose the girls as frauds. He also blames himself for hesitating to come forward with the truth. He sees that the darker tendencies within himself and others have led to this calamity, and they will all go to Hell in the end.Danforth orders Proctor and Corey arrested and sent to jail.Hale is disgusted with the way Danforth has conducted the investigation and refuses to be a part of the proceedings any longer. This is how I picture Mary Warren's fake bird-spirit. She's kind of a chicken. The Crucible Act 3 Quotes Here's a list of the key quotes that are most relevant to the thematic developments that unfold in Act 3. I'll briefly explain the significance of each in context. For a more expansive take, check out our full list of key quotes from all four acts. â€Å"But you must understand, sir, that a person is either with this court or he must be counted against it, there be no road between. This is a sharp time, now, a precise time - we live no longer in the dusky afternoon when evil mixed itself with good and befuddled the world.† Danforth, pg. 87 Here, Danforth affirms the black and white nature of the court’s viewpoint.Anyone who isn’t fully supportive of the court's actions is considered suspicious.The judges can’t afford to have any ambiguity or doubt infecting their decisions because their authority will suffer overall.To maintain control, they seek to create an illusion of precision in the sentencing process.It’s an illusion created as much for themselves as for the rest of Salem.They want to feel secure in the knowledge that they’re doing the right thing, and they can only do that by completely crushing all of their uncertainties. â€Å"In an ordinary crime, how does one defend the accused? One calls up witnesses to prove his innocence. But witchcraft is ipso facto, on its face and by its nature, an invisible crime, is it not? Therefore, who may possibly be witness to it? The witch and the victim. None other. Now we cannot hope the witch will accuse herself; granted? Therefore, we must rely upon her victims - and they do testify, the children certainly do testify. As for the witches, none will deny that we are most eager for all their confessions. Therefore, what is left for a lawyer to bring out?† Danforth, pg. 93 This quote shows Danforth’s rationale for the way these trials have been conducted.It gives us insight into the twisted logic that court officials have adopted in the face of hysteria.Since the crime is invisible, there are no unbiased witnesses available; the only people who can testify to what really happened are the â€Å"witch† and her victim.This means every case is inevitably a he-said-she-said situation where the accused person is immediately mistrusted and coerced into confessing without any chance to defend herself. The terror surrounding witchcraft and the Devil is so great that officials ignore the fact that the accusers might have reasons to lie about their experiences. â€Å"I heard the other girls screaming and you, your honor, you seemed to believe them, and I - It were only sport in the beginning, sir, but then the whole world cried spirits, spirits, and I - I promise you, Mr. Danforth, I only thought I saw them but I did not.† Mary Warren, pg. 100 Mary Warren attempts to explain her actions earlier in the play with limited success. She is faced with skepticism from the judges after such a drastic change in her testimony.There’s no consideration of the psychological elements at play in all of the girls’ testimony and how peer pressure and the approval of powerful adults might encourage their behavior.Mary tries to describe getting swept up in the experience of being in the courtroom. All of her friends were screaming about witches, Danforth believed them, and then the town believed them as well.It’s easy to see how a person like Mary, who is portrayed as an impressionable follower, would mirror the actions and beliefs of others to fit in and feel valued. â€Å"A fire, a fire is burning! I hear the boot of Lucifer, I see his filthy face! And it is my face, and yours, Danforth! For them that quail to bring men out of ignorance, as I have quailed, and as you quail now when you know in all your black hearts that this be fraud - God damns our kind especially, and we will burn, we will burn together!†Proctor, pg. 1 John Proctor is at his wit’s end by the time this act is over because he’s so frustrated with the way the court officials have chosen to shut their eyes to the lies being told right in front of them.This has become a matter of pride for them. They don’t have any real desire for justice; they just want to be proven right.John describes a vision of Hell in which the Devil’s face is merely a reflection of his own face and the faces of all the others who have allowed this tragedy to happen.He delayed disclosing his knowledge of Abigail’s lies to the court, and the officials continued to trust the accusers.They have all actively chosen to encourage ignorance and paranoia out of self-interest rather than inject critical thinking and logic into the proceedings. There's no turning back now. The Crucible Act 3 Thematic Analysis In this section, I'll provide a brief analysis of each of the major themes that show up in act 3 of The Crucible. I'm working on a full thematic analysis that should be coming out soon, so stay tuned! Irony When Hathorne questions Martha Corey, she says she can’t be a witch because "I know not what a witch is" (pg. 77).Hathorne counters by saying that if she doesn’t know what a witch is, she can’t know for sure that she isn’t one.While the officials purport to be on a mission to discover the truth, they’re really just weaving a narrative out of lies that fit their biases while ignoring everything the accused person says. There is also an instance of tragic irony at the end of this act when Elizabeth is brought in for questioning after John confesses to his affair with Abigail.Not knowing that he has already confessed, she lies to protect him. She portrays herself as an irrationally jealous wife, "I came to think he fancied her. And so one night I lost my wits, I think, and put her out on the highroad" (pg. 105).The one time when the perpetually honest Elizabeth chose to lie also happened to be the time when it was most critical for her to tell the truth.Both she and John take actions to protect each other in different ways, but they end up worsening the situation because their priorities are misaligned. Hysteria The hysteria on display in The Crucible reaches its peak during Act 3. Throughout, there are examples of the court officials ignoring logic and evidence in favor of ignorance and paranoia.It becomes clear that the court has chosen to believe the accusers, and any evidence presented indicating that they are frauds is discounted. When the petition testifying to the good character of the accused women is presented, the reaction from Danforth, Hathorne, and Parris is to arrest the people who signed it rather than consider that this might indicate the women's innocence.Danforth is convinced that â€Å"there is a moving plot to topple Christ in the country!† (pg. 91), and anyone who doubts the decisions of the court is potentially involved.The power of mass hysteria is further revealed when Mary can't pretend to faint outside of the emotionally charged courtroom environment.She believed she had seen spirits before because she was caught up in the delusions of those around her. Abigail also distracts the judges from any rational investigation in this act by playing into the mass hysteria.Danforth, who has the most authority, is also the most sold on her act, and it only takes a few screams to persuade him that he’s in the presence of witchcraft.This leads to Mary’s hysterical accusation of Proctor after she realizes she will be consumed by the hysteria monster if she doesn’t contribute to it. Reputation John Proctor sabotages his reputation because he realizes it’s the only way he can reliably discredit Abigail.This is not a decision that is made lightly in a town where reputation is so important.John accepts that he has officially â€Å"rung the doom of [his] good name† (pg. 103).Elizabeth, however, doesn’t realize that he cares enough about her to sabotage his reputation to save her life. She acts under the assumption that his reputation is still of paramount importance and does not reveal the affair. Concern for reputation is also expressed in this act by Danforth and Hale, who both reference the decisions they have already made condemning people to death or imprisonment.Danforth doesn’t want to accept Mary’s testimony because if it is true, it would mean that he made a lot of mistakes, which could destroy his credibility.Hale is more willing to consider that he made a mistake ("I beg you, stop now before another is condemned!" (pg. 105), but he’s very concerned with amending his decisions to align with the truth. He doesn't want his name to end up on the ignorant side of history. Power and Authority Desires to preserve power and authority play a prominent role in the actions of characters in this act, particularly the judges. Danforth and Hathorne refuse to hear Giles Corey’s evidence because he doesn’t present it through the proper channels.Disruptions to the court are treated with great suspicion.John Proctor is immediately asked whether he intends to overthrow the court when he attempts to present contradictory testimony.The people in positions of power have no ability to see things from another perspective because their focus is so concentrated on maintaining their authority.As evidence is presented, it becomes clear that the court is more concerned with preserving an air of infallibility than making just decisions. Deception John Proctor admonishes Mary Warren to tell the truth about the fraudulent nature of the witchcraft accusations, citing examples from scripture to encourage her to do the right thing.At the same time, he has not yet come forward with the truth about his affair, which would give Mary’s charges against Abigail more credibility.Although he eventually does so, it’s interesting to think about how the course of events may have differed if he hadn’t taken so long to reveal the truth to the court. It’s clear that in Salem, sweeping things under the rug or disguising them behind facades of propriety is a way of life.When the truth is finally revealed, it is alien to the judges.How is Mary capable of pretending to faint in the courtroom but not now? How could Abigail Williams, Innocent Teen Victim, have an affair with John Proctor, Forthright Farmer and Family Man? And how could she be devious enough to pull off such dramatic false accusations? These sorts of layers in people’s psychology and behavior are confusing because they typically remain concealed. No one who's in a position to reverse the course of events figures out the truth of what's lurking under the metaphorical floorboards in Salem until it's too late. The Crucible Act 3 Recap Now for a quick reviewof what happened in Act 3. Cue bullet points! Martha Corey is questioned by Danforth. Giles Corey objects to this and argues with the judges, insisting that the accusations against her are phony. Mary and John arrive, and Mary reveals that she didn't actually see any spirits. John presents a petition as evidence of the good character of Elizabeth Proctor, Rebecca Nurse, and Martha Corey, but it backfires; Danforth has warrants drawn up for the signees. Giles informs Danforth that Thomas Putnam told Ruth Putnam to accuse George Jacobs so Putnam could get Jacobs' land. However, Giles won't reveal who told him this, so he's arrested for contempt of court. Danforth reviews Mary's deposition where she testifies that the girls were faking. The girls are brought in and questioned, and Abigail denies the accusations. Mary is unable to pretend to faint on command, which makes Danforth, Parris, and Hathorne doubt her revised testimony. John admits to his affair with Abigail in desperation, but the usually truthful Elizabeth does not corroborate his claims because she doesn't know he's already confessed. Abigail and the other girls act like they are being bewitched by Mary, who accuses John of working for the Devil out of fear that she will be condemned by the court. John Proctor and Giles Corey are arrested, and Hale quits the court. Act 3 makes it clear that the court officials are not willing to see reason. However, there's still a question of who will ultimately face the death penalty over these false accusations and what the fallout of the trials will be in Salem. All this and more will be revealed in Act 4, the final chapter. What's Next? Check out our Act 4 summary or, if you want a recap of the entire story, our summary of the full plot of The Crucible, complete with character descriptions and a list of themes. The events in Act 3 incorporate some key character developments. For more insight, read these in-depth character analyses of John Proctor, Mary Warren, Giles Corey, and Abigail Williams (all coming soon). We've also written short articles on confusing questions that often come up when students study The Crucible. These articles should help you understand why Elizabeth asks John to go to Salem in Act 2 and why Reverend Hale ultimately returns to Salem in Act 4. Want to improve your SAT score by 160 points or your ACT score by 4 points?We've written a guide for each test about the top 5 strategies you must be using to have a shot at improving your score. Download it for free now:

The Coriolis effect Essay Example

The Coriolis effect Essay Example The Coriolis effect Paper The Coriolis effect Paper Galileus corrected this view by explaining the path of such a projectile as a parabola, where a continual downward motion acts on the object, that being the pull of gravity. Newton furthered Galileus argument in showing mathematically, that the impetus was not used up, rather gravity restricted the cannons range by altering the shape to that of a parabola. Newton would argue that when sufficient force is given to the shell, the projectile would fall all the way around the Earth, never touching the ground, prescribing an elliptical orbit. But here is a contradiction. The trajectory of a projectile must follow the arc of an ellipse, not that of a parabola. The curve of a parabola is totally different to an ellipse, so, why then, does Science maintain such a basic false belief? Newton did not realise that he copied an error. It is obvious he did not understand the effects of atmospheric drag, cross-winds, tail winds, chemical behaviour, supersonic melting, and the rotation of the Earth, (the Coriolis effect) because these effects were scientific mysteries at that time. Since Newtons time, much has been discovered and alterations made to Newtons theory. But these changes were at great cost. Although new words and definitions clarified Newtons laws, the nineteenth century scientists and mathematicians who resolved Newtons initial mistakes and omissions, feared scientific outrage, for Newton, the legend, grew more powerful in death. Many who although correct and for the correct reasons, attacked The Great Newton, became ostracised by the scientific community. Credit was rarely bestowed on them, leaving them in historys void. One can pick up virtually any Physics book (this one included) to discover unique translations and understandings of Newtons laws by each author. In Newtons Principia (1726) , the three laws of motion are written as; Law 1. Every body perseveres in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by force impressed thereon. Law 11. The alteration of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed. Law 111. To every action there is always opposed an equal reaction; or the mutual actions of two bodies upon each other are always equal, and directed to contrary parts. The second law is perhaps the most changed through translation. There are so many interpretations of this law that the situation becomes rather confusing. The following are three common variations on Newtons theme. The force required to accelerate a body is proportional to the product of its mass and its acceleration. (Various authors)that if an unbalanced force acts upon a body, the body will be accelerated; the magnitude of the acceleration is proportional to the magnitude of the unbalanced force, and in the direction of the acceleration is in the direction of the unbalanced force. (H. Semat) The acceleration caused by one or many forces acting on a body is proportional in magnitude to the resultant of the forces, and parallel to its direction, and is inversely proportional to the mass of the body. (Resnick Halliday) But these translations seem to have different meanings. In the Principia, Newtons words describe this second law with If any force generates a motion, a double force will generate double the motion, a triple force triple the motion, whether that force be impressed altogether and at once, or gradually and successively. And this motion (being always directed the same way with the generating force), if the body moved before, is added to or subducted from the former motion, according as they directly conspire with or are directly contrary to each other; or obliquely joined, when they are oblique, so as to produce a new motion compounded from the determination of both. Newtons second law seems to be in contradiction to his third law, though there is something in the third law which many fail to see. Again, from Newtons Principia, the description of the third law is If a body impinges upon another, and by its force change the motion of the other, that body also (because of the equality of the mutual pressure) will undergo an equal change, in its own motion, towards the contrary part. The changes made by these actions are equal, not in the velocities but in the motion of bodies; that is to say, if the bodies are not hindered by any other impediments. For, because the motions are equally changed, the changes of the velocities made towards contrary parts are reciprocally proportional to the bodies. Both Newton and Galileus noticed that the outcome bore an inverse proportionality to the body (the mass) of the object. Yet, none of the equations involve the square root of the mass, or the mass squared. In mathematics, when two or more variables are proportional, then the mathematics reflects that concern by the use of the symbol ? . Normally, Newton calls equal proportions, equal, but here he does not and none of the translations do. Universally, they must use the word proportional, not equal. The equation written as F = m a, does not state any proportionality, rather the emphatic is bluntly stated using the operand equals. This equation fails to imply proportionality or that the force is directly proportional, or for that matter, that there is a reciprocity in proportions between the components. Should not the equation be written as F ? m a or perhaps, F = m2 a If F = m2 a happens to be true, it would create a disaster in many areas, for it does not answer (at this moment) any questions, rather it would create a million problems. Proving such as true, would mean that the standards and definitions currently accepted by Physics and the other sciences, (those that rely on the accuracy of Newtons equation F = m a ) would need to be replaced and reworked. Newtons laws of motion relate to linear motion, to all motion in a straight line, when such motion is not found, not possible on the Earth. The cosmological planet Earth is turning on its axis in 23 hours 56 minutes 4. 1 seconds, a rotational speed of 0. 0000116057615 rps. This may be slow, but it is rotating, for even Galileos last words And the Earth still moves made this message clear. The rotation on the Sun is much slower for one revolution takes about 28 days, giving a rotational speed of 0. 0000004145 rps. Jupiters rotation is the most rapid of all the planets completing a single rotation in 9 hours 50 minutes, a rotational speed of 0. 0000282485875 rps. The equatorial tip-speed of astronomical objects, even at low rotational speeds can be an awesome number, due to the radius of the object. A galaxy just a thousand light years across, having a circumference of 3,141. 59 light years does not need to rotate very quickly for the tip-speed to present a red-shift approaching light speed. An annual difference in position of a light year would need to equal the distance light travels in that year, so, the galaxy would need to turn just once in 3,141. 59 years, at which point the outer stars and nebulosity would reach light speed. Generally, galaxies rotate very slowly, but this does not make them any different to normal matter, for the Laws of Nature apply across and throughout the Universe. The major forces involved in a galaxy are rotational. Although magnetism and gravity are far less powerful forces, they shape the galaxy, promoting other fantastic effects. The source of cosmological rotational energy can originate from near-miss gravitational interactions, such as when a galactic body of stars is pulled towards a passing galaxy, the gravitational disturbance produces a sling-shot-effect and the distribution of energy causes both galactic bodies to respond to such motion. But to understand a galaxy means understanding rotation. Foucaults gyroscope is the most amazing scientific toy to observe rotational energy. The toy can be purchased from most toy stores, newsagents and educational supply companies for less than $20. The basic gyroscope can be made for less than a dollar from odds and ends, constructed by attaching a small shaft through the centre of a balanced disk. All spinning objects are gyroscopes; a trucks spinning tyre; a spinning thumb tack; a childs top; a motor; the flywheel and the turbine. As a disk is spun at a high rotational speed, several strange events will be noticed, but be careful, basic safety procedures should be observed, for spinning objects have a habit of breaking apart, grabbing hair, causing deep wounds, and racing across the floor, possessing a definite tendency to break the most expensive piece of pottery in the house. Murpheys laws apply. There are many observational illusions that lurk in rotating devices. With the axis vertical, merely placing the stationary gyroscope on the floor, shows the force of gravity, for it falls over. However, when the disk is spun as rapidly as possible, the device defies gravitys pull, standing upright without falling over, yet the spinning disk and its frame have the same weight. The spinning disk may develop a strange wobble, where the top-most point of the axis seems to follow a circular path, but no matter what is done, this precession follows the direction of rotation. This is the precession of the axis. There seems to be no way of making the precession travel in the reverse direction to the rotation. One can shake, vibrate, thump it, flick or attack the frame, without any change to the direction of precession. It could be easy to argue using simple observations to conclude that precession has something to do with the direction of rotation, gravity, or the bearing drag, but this is not so. Turning the spinning gyroscope upside-down or making it spin in the opposite direction, does not alter the direction of precession for it still follows the direction of spin. Most Physics educators fall head-first into the because-it-is-done-this-way trap, because an observational illusion dictates the mathematics and international scientific agreement alters the truth, hiding the mechanism. The method locks the bottom axle bearing to a hypothetical x-y-z coordinate point in relating precession to the force of gravity on the entire structure acting at that point. This is not the true reference point for the gyroscope is not a terrestrially referenced device, yet the terrestrial frame of reference is repeatedly used. The gyroscopes frame of reference is Universal. To prove this, it is necessary to do something so trivial, the feat escapes the attention of the most observant. Simply pick the spinning gyroscope up by the top-most bearing and it is seen to precess in the opposite direction to the spin! Immediately, all gravitational and bearing drag effects have been eliminated. An obvious observational error has introduced a nasty knowledge virus into Science where all observations of the gyroscope use the terrestrial frame of reference. The mathematical explanations of the gyroscope and its precession are illusions with physical manifestations producing complex physical properties! The gyroscope precesses around the gyroscopes axial centre, not the bottom-most bearing or the centre of mass. Mass irregularities between the axial centre and the centre of mass result in several commonly observed gyroscopic effects. If precession were a terrestrial event, then it would present opposite motion in each hemisphere, but then the Earth also precesses so where is the gravity pulling the Earth? Figure 14-1 changes the mathematical explanations in a single blow. Having realised the error, the mechanism must be found. But what happens when two disks are fixed to the same shaft? A train has such wheels, where a steel axle shaft supports a gyroscopic tyre on each end. Effectively, two independent gyroscopes are connected to a common shaft. The direction and speed of both gyroscopes can only be identical, where any differences will result from the mass distribution and balance of the tyres. The axle is connected to the bogie frame supporting each end of the shaft with a bearing. As the two disks rotate together, the left hand gyroscope has a precession clockwise on the left side and anti-clockwise to the right side. The right hand gyroscope is identical, meaning that along the centre shaft, there is a conflict in precession. The left wheel is twisting the shaft anti-clockwise, while the right wheel is twisting the shaft clockwise. At certain speeds, dangerous resonances occur in the shaft as the dual precession twists and strains the shaft. Figure 14-1 Reversing precession The complete bogie mounts two or more independent axle-wheel pairs. As the axles roll on the track, the left side wheels are twisting with a clockwise precession, while the right hand wheels are twisting with an anti-clockwise precession to the outside. Each wheel may be precessing at different rates. Bogie-slap is the term sometimes used to describe this effect, for no matter how well balanced the wheels may be, the bogie will wobble between the rails so erratically, it is to the discomfort of passengers, knocking the tracks apart, which, if not corrected can lead to a derailment. The solution to bogie-slap is to independently support inclined wheels on their own axles (figure 14-2). Figure 14-2 The Method of Correcting the dangerous gyroscopic instabilities in train wheels What happens when one continually flexes a thin wire? Even though the shaft may be 20 cm diameter machined steel, with time it must suffer metal fatigue, a molecular failure. The broken axle is generally attributed to mechanical failure not gyroscopically produced metal fatigue. Figure 14-2 illustrates this effect where the dual gyroscope action causes flexing, bending and distortion of the axle. When a motor is connected to a pulley, it forms the same dual structure with the same inherent twisting and resonance problems. As the motor spins up in speed, the connecting shaft enters regular periods of stability and instability as the twisting forces resonate through the shaft. This effect has nothing to do with gravity! With high speed drink mixers, the motors rotation passes through a speed-up gear system. The drive shaft of the high speed blender, has at one end, a very small gear coupled to a large motor gear. The beauty of this design is that it reduces the dual gyroscope effect, allowing the blender to reach speeds in excess of 10,000 rpm (166. 6 rps). Geologists have a great deal of trouble explaining why the Earths interior is hot. They believe that the internal temperature is related absolutely to the breakdown of atoms through nuclear events, where radioactive decay is the only accepted explanation. If this were the case, evidence should be found to substantiate the claim, like, everyone living near an active volcano should suffer radiation sickness and have mutant children. Radioactive decay need not be the full picture, for the rotating Earth must be considered as a rotating object, not as a static object. Any sphere can be considered as made up of many parallel balanced disk pairs, layer by layer, mounted on the axis. Each pair of disks forms the dual gyroscopic structure where the twisting forces are at loggerheads with each other, causing flexure, heating and stirring in the Earths interior. As long as the Earth turns on its axis, it will remain hot. Once a planet loses it rotation it will rapidly cool and solidify. Such dead non-rotating planets include Venus, Mercury and The Moon. Seismically, these dead planetary objects, when struck would all ring-like-a-bell. Massive dark objects, perhaps greater in size and mass than the Sun, will be found to exist in the Galaxy, as collapsed, non-rotating dead-stars. Such objects would contain normal matter, with normal densities, perhaps with a crust much like the Earth, of silicates and frozen gasses, water, Helium, Hydrogen, and Carbon structures. Gravitational differentiation (settling and separation of different mass molecules) in the cooling stellar mass may lead to critical mass conditions developing unstable shells at particular radial distances within the mass, causing an explosion that may regularly blow the dead-star apart, in many supernova events forming dangerous dark rubble-stars. Effectively, as the Earth is slowing down, it is losing heat ever so slightly. The current rate of slow down may be a second every century, but it is still a slow down. Back when the dinosaurs existed, the Earth would have experienced a much faster rotation. Perhaps, when the primordial Coriolis blob formed the Sun and Earth, the rotation may have been once every eight hours. This leads to a problem, because mankind is attempting to extract electrical power from geothermal sources. The greater the rate that power is removed, the cooler the Earth will become and the greater the rate of slow-down. Rotational energy does not work like gravity. It is not related to the actual or inferred centre of mass. The centre of mass is only a hypothetical point of maximum signal strength used in gravitational-feedback calculations. Nature does not work through calculations, rather she works with cause and effect, selectively evolving through survivors. Over-and-over-again, Nature will try the same experiment, even though failures occur, but one experiment will create a survivor. Many survivors create a colony. The key needed to solve Natures rotational trick is the direction of the axis itself. With any rotating object, a sphere, shell, cube, box, cylinder or, tube, prism or block, the axis must be considered as having no mass. The axle may have a mass, but the axis itself has zero mass. The axis is a hypothetical line joining all positions of zero motion, about which centrifugal forces radiate. Relativity shows there are actually two primary forces involved here, the centripetal force and the centrifugal force. The centripetal force holds matter together and allows energy to be transferred from the axis to the circumference of the object or vice versa. The centrifugal force is the radial spin-out force remaining perpendicular to the axis, from the particular axial height to the circumference at that height in the perpendicular direction. The gyroscope is not defying gravity, rather it is locking onto a fixed universal stationary direction, having a slipping plane direction. Figure 14-3 addresses the attributes of the gyroscope. Figure 14-3 The Gyroscopes forces. One demonstration of this is the nylon fibre lawn edge trimmer, where a single strand of 8 or 10 gauge nylon thread is twirled around a central hub so rapidly that it takes on the resilience of blade steel. Slow motion images of this cord show it to be absolutely taut, at an angle perpendicular to the axis of rotation. Equally, when a thin plastic disk is rotated, even at relatively low speeds, the disk takes on a rigidity perpendicular to the axis. Typical applications of this include the floppy disk drive and CD player. A soft plastic disk when rotated can be used to cut through much harder materials, due to the change in molecular strength. Describe the motion of a spinning woollen pom-pom with respect to the rotation. Across the surface of a rotating disk, the atmosphere is pulled around with the disk to be spun off creating a super high speed wind immediately above the disks surface. So powerful is this molecular wind, it is capable of holding tightly sprung disk-drive heads well apart and away from the surface of the floppy disk. A method of killing a disk drive is to evacuate the disk-head chamber. The same occurs in the hard disk drive (HDA), but rather than having one disk, the computers HDA may have as many as twenty four pancaked disks. The disk drive heads are virtually clamped together, but as the head assembly approaches the disk, the wind opens the heads and blows them apart, holding then at a constant height at that radius. The slower the disk speed (towards the centre), the closer the heads are to the surface. A particle of smoke hitting the head can cause gyroscopic instabilities between the head and the platter resulting in a head crash. This does not normally eventuate, though, when it does, the event is to be remembered, for nothing much remains. Typically, the head crash causes the disk to be cut away near the axis whereupon the disk sheers away. Needless to say, all the data stored on that disk drive is lost. Due to the seek times and storage needed in major mainframe computer installations, removable disk platters were used. Some of these drives spun the 8 plate 30cm diameter platters at speeds above 5,000 rpm ( 83. 3 rps producing a tip speed of some 178. 53 m/s or 282 Km/h). The head crash could cut the disk from the platter in a second. Once airborne, the disk would smash through the protective housing, the casing, flying-off across the computer room to bury itself edge-wise into any distant object, with such an impact force, chemical reactions take place between the disk and the object it entered. These disks do not strike objects, they enter them and form chemical bonds. As the gyroscope spins, it passes through periods of absolute stability, followed by periods of instability. As the disk slows, the precession becomes more and more pronounced. Eventually as the rotation fails, the force of gravity grounds the gyroscope. This effect indicates an atomic and molecular resonance in the gyroscope, where the centrifugal and centripetal forces are continually compensating. A magnetic shock travels along the axis and rebounds, but in the mean time, the disk has rotated. If the reflection point is immediately below or 180 degrees out of phase, stability exists in the gyroscope, however, as the reflection point drifts out of phase, the systems instability increases as the axis is knocked from the vertical position and then precession follows the rotation. The precession may cause the object to violently wobble when the phase shift is 90 degrees. This is a molecular resonance effect and is different between different materials. This is the G-wave, an effect caused by matters elasticity. The effect can be seen and heard during instability where the forces are so great, bearing grab presents a drag force causing maximum axial deviation and the observed precession. As the disk precesses, the bearings are pushed and pulled sideways with greater friction, transferring considerable rotation to the mounting frame. At high speeds the bearing drag pulls the gyroscopes mounting frame around rapidly but as soon as stability returns the frame ceases to be dragged around. With the on-set of stability, the pressure on the bearings is constant and minimal while the energy losses to the mounting frame are minimised. A worst case scenario is called bike-slap. It is a problem that has killed many expert motor bike riders. This is not a rider error, it is a serious motor bike problem. The effect results from numerous design errors in both the design and manufacture of the bike frame. It is a manufacturing fault and as such the manufacturers should be made to pay compensation to the families of those they have murdered and maimed through negligence. There is no justification for an inferior design in the market place, however one often observes the effect during motor bike races (to the amusement of the crowd). Basically, the frame holds the motor and its flywheel (the first gyroscope). As the steering geometry changes at speed, a small displacement in the angle of the front forks caused by a twist in the front wheel (the second gyroscope) to a slightly different angle to the real wheel (the third gyroscope) and the engine. The frame is allowed to flex within reason and within certain tolerances. The frame absorbs and stores the twisting forces as the rider enters a corner with the power on. As the corner is negotiated, the power applied to the back wheel is changed, but then without any warning, the twist forces stored in the frame suddenly release causing the bike to slap to one side, immediately throwing the front and rear wheels sideways, initiating precession at different rates in different respective directions, violently establishing an uncontrollable buckling oscillation in the bike, causing each gyroscope to slip, creating an effect much like sitting on a bucking bull. The rider can be lucky riding this bull and be thrown clear. Then again, one can be thrown under the oncoming traffic, into a curb, or have the bike come crashing down on top of oneself. This is not a pleasant experience and may occur by simply turning a corner at slow speed. Some very interesting effects are noted when the gyroscopes curved steel frame is supported by a moderately strong bar magnet (figure 14-4). An electrical eddy current flows in the spinning disk, effectively holding the gyroscope against the precession forces. To walk the square pole piece of the magnet into a different supporting position, (without touching the frame with the hands) is quite difficult. The bearings apply changing forces on the spinning mass, causing the axis to precess differently. One can hear the bearings grab as the axis attempts to remain pointing in the same direction. The energy transfer from the frame to the disk and back to the frame causes sudden and rapid axial direction changes. Moving the support position towards the axis reverses the precession while moving the support from the axis to the circumference produces a normal but temporary precession. In each case, the precession is sudden, and locks to a new direction. But there is more. Figure 14-4 Hanging the Gyroscope When the bar magnet is hung from 35 cm of string or wire, so that the magnet is vertical and away from any nearby obstruction, just hanging in space, the gyroscopes precession oscillates, due to the interaction between the magnet, the Earths rotation and magnetic field as well as the support position changes taking place. A small 1. 5 cm steel ball bearing placed in the magnetic circuit between the pole piece and the support housing removes the support position component caused by the square face of the magnet. With this change, normal precession is still resisted, giving a wobble until the disk starts to slow down. A great deal of bearing grab is heard as the gyroscope twists the string. With the axis slipping to the vertical, a great deal of vibration will be seen in the string. When prevented from slipping, the vibration in the string becomes pronounced. This stored twist force does not release until the rotation virtually ceases. The Gaxis seems to favour coming to rest pointing more vertically in the East-West direction. A well known childs toy, called the topsy-turvey-top, establishes a scientific problem of the first order. This has been addressed in several outstanding scientific papers. Basically, the top is weighted differently so that when spun between the fingers, it lands on the surface on its point, as do most other tops, but then completely does a back-flip to spin in the opposite direction, without any loss of rotational speed, balancing on the tops top point with stability. This is not really balancing as such. This is a demonstration of the conflict between rotational energy and gravity. How is the direction reversed? To change the direction of a gyroscope involves overcoming the centrifugal forces holding the axis in place. Once sufficient force is obtained, the axis can be made to move, to slip or yaw, rolling over so that the rotation of the axis is in the opposite direction, so any precession reverses, being relative to the direction of motion around the axis. For a locomotive pulling a train, travelling on a single track to change direction, requires slowing down, stopping completely and then pushing the train in the opposite direction. The same happens when a ball strikes a wall. Particle reflection takes a great deal of time and uses considerable energy to reverse the direction. However, the train may travel.

River flowing through a village - High Atlas mountains in Morocco Essay

River flowing through a village - High Atlas mountains in Morocco - Essay Example But this transportation depends upon the how much area is available to the river for carrying the water downstream. The High Atlas is the biggest mountain range in North Africa. This area covers some of the most beautiful regions of Morocco, Algeria and Tunisia. There are a number of streams flowing with volumes of water downstream. Cross section of the channel of stream can be depicted as in fig-1 below; As the stream approaches leaves the hill areas and reaches the plain areas its width tend to increase owing to spread of the river. But at the same the depth also varies. The depth may become more or slightly less, but generally there is no drastic reduction in depth. In addition the average speed of the river also slows down in plain areas. Efficiency of a water channel is determined by the amount of water it carries along. The channel works as a conduit for water. Cross Sectional Shape of the channel keeps varying with position in the stream, and discharge. The channel becomes deep at places where the velocity of river is high and results in deeper penetration. In general both width and depth increase downstream with increase in discharge downstream. The channel will be termed as most efficient at places where it can carry the maximum amount of water. Tourism plays an important role in understanding the region, the country, its people and the region. Tourism is also an integral part of the economy of Morocco. After the terrorist attacks against Casablanca Moroccan economy was badly hit as the inflow of tourists decreased. The country is now gradually recouping the lost opportunities with gains in this major industry. i.e. The first direct economic consequences of the terrorist attacks against Casablanca are already visible in Morocco's major industry; the tourism trade. The High Atlas Mountains in Morocco are a major attraction for tourism and trekking events. The Atlas Mountains and Morocco's imperial cities are the main centres of attractions for Morocco. Besides the continuing efforts of the local government, in 2003, a USAID contractor (Chemonics International), selected southern High Atlas Mounta

Analytical essay on Mesopotamian art and architecture

Analytical on Mesopotamian art and architecture - Essay Example Additionally, Assyrian art design was different from the structure of Babylonian art, which eventually became the main modern designs in Mesopotamia, resurfaced during the 1500 BC and prevailed until the end of Nineveh reign in 612 BC. Generally, the main aspect of Assyrian art design was the chopped stone relief of polychrome structure that was used to festoon imperial arts. The clearly delineated reliefs symbolized royal affairs, mainly hunting and organizing for successful battles. The art predominantly captures animal designs, especially a horse and lion; these were elegantly portrayed in the art in a comprehensive manner (Begemann et al 135-169). Additionally, though, important personalities are fairly rigid they are also benignly represented, as in victorious scenes of operations, wars, and individual military contribution. Assyrian reliefs that apparently popular include the lion-hunt sculptures depicting Assurbanipal of 7th century BC and Assurbanipal II of the 9th century BC (Ulrichsen 349-377). Both carvings are archived by the British. Guardian nature composed of lions and other flying wildlife with hairy human face. The models were presented in incomplete curves for strong regal entrances. It is notable, though, that Nimrud-carved elephant tusks and bronze plates were located by archaeologists. The items are colored in the Assyrian form, and were the brainchild of and Aramaic and Phoenician artisans (Landes, Mokyr, and Baumol 164-168). Mesopotamia’s structural designs are the earliest designs of the society of the Mesopotamia region, which is popular for the Tigris and Euphrates rivers. The designs include several unique cultures and lasting between the 10th millennium BC and the 6th century BC when the oldest structures were erected. Notably, the Mesopotamian architectural achievements encompass the growth of towns through proper structuring techniques, the

World Religions - Psychology of Mystical Experience Term Paper

World Religions - Psychology of Mystical Experience - Term Paper Example Within the Bible, saints, mystics, and sages blessed with an intimate God’s knowledge have existed since the beginning of ages. Mystical experiences are opposite of the numinous experiences in a number of ways. All ‘otherness’ in mystical experience disappears while the believer becomes one entity with the transcendent. Through this, the believer discovers his/her similarity with the deity, cosmos, or other reality. According to Zaehner, quoted by James William (17), there are 2 typically varied mystical experiences: religious and natural mystical experiences. These two modes of mystical experience vary in their nature and scope with the natural mysticism being free from any particular tradition link like the religious mysticism. Actually, religious mystics are common among us today. For over the last 100 years, researchers in religious scientific study have had the ability of determining that God’s mystical experiences are actually not so rare (Vincent 1). The purpose of this paper is to interpret the mystical experiences using the approaches and theories of Freud and Jung. This paper wil l offer some social science and personal evidence that will aid in expanding this phenomenon’s understanding.

Evolution of Australian Flora: Hymenopteran Visual Systems

Evolution of Australian Flora: Hymenopteran Visual Systems Abstract Very little work has been done on the evolution of floral colour diversity, outside of Europe and the Middle East. In particular, we know almost nothing about the evolution of the Australian flora in the context of hymenopteran visual systems. Such a study is likely to be important due to the geologically long isolation of the Australian flora and the high proportion of endemic plant species. The aims of this study were to investigate the colour of Australian native flowers in the context of hymenopteran visual systems, the innate colour preferences of Australian native bees (Trigona carbonaria), and the interactions between native bees and a food deceptive orchid (Caladenia carnea). Firstly, I found that the discrimination thresholds of hymenopterans match up with floral colour diversity and that hymenopterans appear to have been a major contributor to flower colour evolution in Australia. Secondly, I found that Trigona carbonaria has innate preferences for wavelengths of 422, 437 a nd 530 nm. Thirdly, I found that bees were able to habituate to orchid flowers based on colour, thus potentially explaining the colour polymorphism of Caladenia carnea. Together, my study suggests that the evolution of the Australian flora has been influenced by hymenopterans. 1. Introduction Plant-pollinator interactions The mutual interactions between pollinators and plants have been suspected in driving angiosperm radiation and diversification in the past (Regal 1977; Crepet 1984; McPeek 1996). The obvious mutual benefit is that pollinators depend on the pollen and/or nectar of flowering plants for food and, in return, partake in the incidental transfer of pollen necessary for plant reproduction (Faegri and van der Pijl 1978; Harder, Williams et al. 2001). Worldwide, it is estimated that more than 67% of angiosperm plants rely on pollination by insects (Tepedino 1979). Hence, pollinators play a critical role in the persistence and survival of flowering plants, which are of high value to the human food chain (Kearns and Inouye 1997; Klein, Vaissiere et al. 2007). Flower colour signals and sensory exploitation Colour is the result of the visible light being absorbed or reflected off objects and then processed by the eye and brain of an animal (Le Grand 1968). Light is part of the electromagnetic spectrum, and can be quantified by the wavelength of different photons of energy (Bueche 1986). The wavelengths reflected off the object are perceived by a visual system as the object’s colour. For example, light that appears blue to a human observer can be described by a dominant wavelength of 400nm, whilst light that appears red is 700nm. Ultraviolet light falls between 300-400nm and can be seen by bees, but not humans. Flower colours have been influenced by the sensory receptors of insects, including their colour vision, which is different to human vision. Humans have a red, blue and green receptor (Chittka and Wells 2004). In contrast insects have a UV, green and blue receptor (Chittka and Wells 2004). As human vision is very different to a hymenopterans’ colour visual system, one cannot discuss a bees’ colour perception according to human colour terms such as red or blue. Therefore, this thesis will discuss colours according to wavelength. Colour is one of the most important floral signals plants use to communicate information to insect pollinators (Giurfa, Vorobyev et al. 1996; Dyer, Spaethe et al. 2008). Although it is known that pollinators select flowers based on morphology, nectar availability, size, and odour (Giurfa, Nà ºÃƒ ±ez et al. 1994; Kunze and Gumbert 2001; Spaethe, Tautz et al. 2001; Whitney and Glover 2007), colour is known to play a critical role in enabling pollinators to detect and discriminate target flowers from a biologically important distance of up to 50 cm (Giurfa, Vorobyev et al. 1996; Dyer, Spaethe et al. 2008). Our understanding of the evolution of colour vision in insects has advanced considerably in recent years. In the past, studies of colour perception were limited due to little information on the colour visual system of insects (Frisch 1914; Daumer 1956). It is now possible to evaluate how flower visual signals appear to the visual system of hymenopteran pollinators, using spectrophotometer and colorimetry techniques, which allows quantitative evaluations of how complex colour information is perceived by insect pollinators (Chittka 1992) (fig. 1). Previous research has revealed that colour discrimination in hymenopterans is phylogenetically ancient, with different hymenopterans sharing similar colour perception (Helversen 1972; Chittka and Menzel 1992). Importantly, colour discrimination in the hymenoptera is known to predate the evolution of floral colour diversity (Chittka 1996). Here, recent research has revealed remarkable convergence in the evolution and distribution of floral colours in different parts of the world. Specifically, in a seminal paper, Chittka (1996) showed that flowering plants in both Europe and the Middle East have adapted their colour signals to the visual systems of bees, with flower colours in these regions closely matched to the visual receptors of hymenopterans (Chittka 1996). However, outside of Europe and the Middle East, very little work has been done on the evolution of floral colour diversity. In particular, we know almost nothing about the evolution of the Australian flora in the context of hy menopteran visual systems. This is an important question to investigate due to the long isolation of the Australian flora and the high proportion of endemic plant species. I hypothesise that the Australian floral coloration will closely match the discrimination thresholds of hymenopterans as recent evidence suggests that insect pollinators supported the early spread of flowering plants (Hu, Dilcher et al. 2008). Innate colour preferences of bees Charles Darwin was the first to state that innate preferences could allow an inexperienced pollinator to find a food source (Darwin 1877). Pollinators may use certain traits of flowers such as morphology, scent, temperature and colour to locate food (Heinrich 1979; Menzel 1985; Dyer, Whitney et al. 2006; Raine, Ings et al. 2006). Previous studies evaluating innate colour preferences have tended to focus on two species: the European honey bee (Apis mellifera) and bumblebee (Bombus terrestris). By contrast, no studies have looked at the innate colour preferences of Australian bees and how this affects their choices for flowers. We know that European bumblebees and honeybees show strong preferences for violet and blue (400-420nm) throughout their geographic range (Chittka, Ings et al. 2004) ,which interestingly correlates with the most profitable food sources (Lunau and Maier 1995; Chittka and Raine 2006). These preferences are likely to have had an impact on the relative success of dif ferent flower colours in regions where these bees are dominant pollinators (Chittka and Wells 2004). Consequently, information on the innate preferences of Australian bees will be important to understand hymenopteran plant interactions in the Australian context. Pollinator learning and food deceptive orchids Most plants reward their pollinators with nectar or pollen. However, some species do not offer floral rewards and, instead, employ a range of deceptive techniques to trick insects into performing the task of pollination. Deceptive pollination strategies are particularly well known and widespread among orchids (Jersà ¡kovà ¡, Johnson et al. 2006). For instance, approximately 400 orchid species are known to achieve pollination through sexual deceit, luring unsuspecting male insects to the flower through olfactory, visual and tactile mimicry of potential mates. More common are food deceptive orchids which are believed to number as many as 6,000 species (one-third of orchids) (Jersà ¡kovà ¡, Johnson et al. 2009). Food mimicking orchids employ bright colours to falsely advertise the presence of a reward to attract naive pollinators (Ackerman 1986; Nilsson 1992; Jersà ¡kovà ¡, Johnson et al. 2006). The common occurrence of food deception in orchids suggests that this form of pollinat ion by deception is an extremely successful evolutionary strategy (Cozzolino and Widmer 2005). Visits by pollinators to deceptive plants are influenced by pollinator learning. In the case of sexual deception, previous research shows that insects quickly learn unrewarding flower decoys and avoid them. For example, male insects learn to avoid areas containing sexually deceptive orchids (Peakall 1990; Wong and Schiestl 2002). However, whether insects can learn to avoid food deceptive orchids remains to be investigated. In addition, high levels of variability in floral traits, particularly flower colour and floral scent, may interrupt the associative learning of insects by preventing their ability to become familiar with deceptive flowers (Schiestl 2005). Indeed, variation in colour, shape and fragrance is evident in non-model food-deceptive orchids (Moya and Ackerman 1993; Aragà ³n and Ackerman 2004; Salzmann, Nardella et al. 2007). However, previous studies have only looked at pollinator preference for colour morphs (Koivisto, Vallius et al. 2002), rather than assessing if vari able flower colour slows down the ability of naive pollinators to learn unrewarding flower decoys. Furthermore, there is a need to incorporate a combination of colour vision science and behavioural ecology to understand how a bee perceives the orchid flowers, as bees have a different visual system to humans. Although humans cannot see ultra-violet light, UV sensitivity is common in some animals (Tovà ©e 1995). UV sensitivity has been found in insects, birds, fish and reptiles (Marshall, Jones et al. 1996; Neumeyer and Kitschmann 1998; Cuthill, Partridge et al. 2000; Briscoe and Chittka 2001). Studies on UV vision in an ecological context have mainly focused on species specific signalling and mate choice (Bennett, Cuthill et al. 1996; Bennett, Cuthill et al. 1997; Pearn 2001; Cummings, Garc et al. 2006). However, few studies have looked at the role of UV signals in attracting bees to orchids. Previous studies have shown that the presence of UV reflecting crab spiders attracts honeybees to daisies (Heiling, Herberstein et al. 2003). In a similar study, Australian native bees (Austroplebia australis) were attracted but did not land on flowers with UV reflecting crab spiders (Heiling and Herberstein 2004). However, the role of UV signals in orchids is not well studied. In particular, it is not known if the UV signal is important in attracting naive bees to food deceptive orchids. Thus, it will be useful to know if UV signals might also serve to lure naive pollinators to deceptive flowers to understand deceptive pollination. Aims This project will investigate Australian flower colour diversity in the context of hymenopteran visual systems, the innate colour preferences of Australian native bees (Trigona carbonaria) and their interactions with a food deceptive orchid (Caladenia carnea). This study aims to address the following questions: 1. Is there a link between hymenopteran vision and Australian floral coloration? 2. Does an Australian native bee (Trigona carbonaria) have innate colour preferences? 3. Does a food deceptive orchid (Caladenia carnea) exploit the innate colour preferences of Trigona carbonar 2. Methods Part 1. Is there a link between hymenopteran vision and Australian floral coloration? Flower collection and spectral reflectance functions of Australian native plant flowers Australian native flowers were collected from Maranoa Gardens, Balwyn (melway ref 46 F7). Maranoa Gardens was chosen due to the diverse collection of species from all over Australia. Flowers were collected once a month, from May to January. A colour photograph was taken of the flower for identification. I also took a UV photograph for all flowers, using a digital UV camera [Fuji Finepix Pro S3 UVIR modified CCD for UV imaging] with calibrated UV-vis grey scales (Dyer, Muir et al. 2004). As UV rays are invisible to the human eye (Menzel and Blakers 1976; Dyer 2001), this photo enabled any UV reflectance areas of the flower to be measured by the spectrophotometer (Indsto, Weston et al. 2006). The spectral reflection functions of flowers were calculated from 300 to 700 nm using a spectrophotometer(S2000) with a PX-2 pulsed xenon light source attached to a PC running SpectraSuite software (Ocean Optics Inc., Dunedin, FL, USA). The spectrophotometer was used to quantify the colour of the flower as wavelength. The white standard was a freshly pressed pellet of dry BaSO4, used to calibrate the spectrophotometer. A minimum of three flowers from each plant were used for each spectral analysis. I evaluated a sample of 111 spectral measurements from Australian flowering plants, encompassing a representative variety of plant families (fig. 2). Correlations between spectral reflectance functions of different plant flowers and trichomatic vision of the honeybees To understand if there is a link between hymenopteran vision and Australian native flowers, I used the methodology used by Chittka and Menzel (1992). In that study, Chittka and Menzel looked for correlations between flower spectra sharp steps of different plant flowers and trichomatic vision of the honeybees. Sharp steps are a rapid change in the spectra wavelength (Chittka and Menzel 1992) (see fig. 3 for an example of a sharp step). These steps cross over different receptors, thereby producing vivid colours that stand out from the background. Furthermore, a colour signal will be more distinguishable to a pollinator if the sharp steps match up with the overlap of receptors in a visual system. Thus, the main feature of a flower wavelength is a sharp step. For this study, I defined a sharp step as a change of greater than 20 % reflectance in less than 50 nm of the bee visual spectrum. The midpoint of the slope was determined by eyesight as described by Chittka and Menzel (1992), as th e nature of curves varied with each flower. The absolute numbers of sharp steps within each flower spectra were counted. The frequencies are shown in fig. 4b. As hybrid plants are artificially selected by humans, hybrid flowers were not included in the analyses. Generating a Hexagon colour space To evaluate how flower colours are seen by bees, I plotted the flower colour positions in a colour hexagon space. A colour space is a numerical representation of an insect’s colour perception that is suitable for a wide range of hymenopteran species (Chittka 1992). In a colour space, the distances between locations of a two colour objects link with the insect’s capacity to differentiate those colours. To make the colour space, the spectral reflectance of the colour objects were required, as well as the receptor sensitivities of the insect. For Trigona carbonaria, the exact photoreceptors are currently unknown, but hymenopteran trichromatic vision is very similar between species as the colour photoreceptors are phylogenetically ancient (Chittka 1996). Thus, it is possible to model hymenopteran vision with a vitamin A1 visual template (Stavenga, Smits et al. 1993) as described by Dyer (1999). I then predicted how the brain processed these colour signals by using the avera ge reflectance from each flower, and calculating the photoreceptor excitation (E) values, according to the UV, blue and green receptor sensitivities (Briscoe and Chittka 2001) using the methods explained by Chittka (1992). The UV, blue and green E-values of flower spectra were used as coordinates and plotted in a colour space (Chittka 1992). The colour difference as perceived by a bee was calculated by the Euclidean distance between two objects locations in the colour hexagon space (Chittka 1992). Modelling the distributions of Australian flower colours according to bees’ perception I analysed the most frequent flower colour according to a bees’ colour perception using the methods of Chittka, Shmida et al. (1994). I plotted the Australian flower colours in a colour space (Fig 5a). A colour space is a graphical representation of a bees’ colour perception. A radial grid of 10 degree sectors was placed over the distribution of colour loci and the number of floral colour loci within each sector was counted(fig. 5b). Part 2. Does an Australian native bee (Trigona carbonaria) have innate colour preferences? Insect model and housing Trigona carbonaria is an Australian native stingless bee that lives in colonies of 4000-10000 individuals (Heard 1988). In the wild, stingless bees live in hollows inside trees (Dollin, Dollin et al. 1997). Trigona carbonaria has a similar social structure to the honeybee (Wille 1983). They are common to North Eastern Australia and are a potentially important pollinator for several major commercial crops (Heard 1999). A research colony (ca. 4000 adults and 800 foraging individuals) of T. carbonaria was propagated for the experiments by Dr Tim Heard (CSIRO Entomology, 120 Meiers Rd, Indooroopilly 4068, Australia) as described in the paper by Heard (1988). Bees were maintained in laboratory conditions so that no previous contact with flowers had been made. For this study, a colony was placed in a pine nest box (27.5 x 20 x 31 cm; LWH) and connected to the foraging arena by a 16 cm plexiglass tube, containing individual shutters to control bee movements. All laboratory experiments were conducted in a Controlled Temperature Laboratory (CTL) at Monash University, Clayton, School of Biological Sciences (CTL room G12C dimensions 3 x 5m), during the months of July 2009- January 2010. Relative humidity (RH) was set to 30%, and the temperature was set to 27  °C (SPER-Scientific Hygrometer, Arizona, USA), as this set up approximately matches conditions in Queensland for insect pollinators (Heard and Hendrikz 1993). Illumination (10/14 hr day/night) was provided by four Phillips Master TLS HE slimline 28W/865 UV+ daylight fluorescent tubes (Holland) with specially fitted high frequency (>1200Hz) ATEC Jupiter EGF PMD2x14-35 electronic dimmable ballasts which closely matches daylight conditions for trichromatic hymenoptera (Dyer and Chittka 2004). The flight arena (1.2 x 0.6 x 0.5m; LWH) was made of a coated steel frame with laminated white wooden side panels. The arena floor was painted foliage green, and the arena lid was covered with UV transparent plexiglass. Experimen ts were conducted from 1pm-3pm to control for time of day, as this is when bees are most active (Heard and Hendrikz 1993). Pre-training Bees were habituated to the flight arena for seven days. Naive foragers (i.e. bees that had never encountered real or artificial flowers) were initially pre-trained to forage in the flight arena on three rewarding aluminium sanded disks (25 mm in diameter), with a 10-ÃŽ ¼l droplet of 15% (w/w) sucrose solution placed in the centre. The disks were placed on vertical plastic cylinders (diameter = 25 mm, height = 100 mm), to raise them above the floor of the flight arena so that bees learnt to fly to the disks. Pre-training allows bees to become habituated to visiting artificial flowers for further experiments. The aluminium sanded disks were chosen as neutral stimuli because they have an even spectral reflectance curve in the spectral visual range of the bees, fig. 6. The sucrose solution reward on these training disks was refilled using a pipette after it was consumed by foraging bees. The spatial positions of these training disks were pseudo randomised, so that bees would not learn t o associate particular locations with reward. Bees were allowed a minimum of two hours to forage on the pre-training disks before data collection Innate colour preference testing To test the innate colour preferences of naive bees, I performed simultaneous choice experiments with flower-naive bees using artificial flowers that simulated the floral colours of natural flowers. The aluminum rewarding disks were replaced by the ten unrewarding, coloured artificial disks in the original flight arena. Artificial flower stimuli were cut in a circle (70 mm diameter) from standardized colour papers of the HKS-N-series (Hostmann-Steinberg K+E Druckfarben, H. Schmincke Co., Germany). In each experiment the same set of ten test colours (1N pale yellow, 3N saturated yellow, 21N light pink, 32N pink, 33N purple, 50N blue, 68N green, 82N brown, 92N grey, back of 92N white) were used. These colours were chosen as they have been used in innate colour experiments with other hymenopterans (Giurfa, Nà ºÃƒ ±ez et al. 1995; Kelber 1997; Gumbert 2000), and the colours are also widely used in other bee colour experiments (Giurfa, Vorobyev et al. 1996). The coloured paper disks were placed on vertical plastic cylinders (diameter = 15 mm; height = 50 mm), to raise them above the floor of the flight arena. The gate was shut in the arena to ensure the bees used in each trial were separated from the next trial. The number of landings and approaches to the stimuli were recorded for one hour. Approximately 200 bees were used for each trial. The spatial positions of the artificial flowers were pseudo randomised in a counter balance fashion every 15 minutes. After each trial, the colour disks were aired and wiped with a paper tissue to remove possible scent marks, which are known to affect experiments with honeybees (Schmitt and Bertsch 1990; Giurfa and Nà ºÃƒ ±ez 1992). I conducted each subsequent trial after removing the used bees from the system, to ensure that the bees in the next trial were replaced with naive foragers. It is known that perception of colour can be influenced by background colour (Lunau, Wacht et al. 1996). Therefore, I also tested colour choices on other background colours of grey and black. The results are qualitatively similar (fig. 8b), so only data from the biologically relevant green background was used for subsequent analysis. Analysis of colour stimuli As bees see colours differently to humans, I quantified stimuli according to five parameters: wavelength, brightness, purity (saturation), chromatic contrast to the background and green receptor contrast. Dominant wavelength was calculated by tracing a line from the centre of the colour hexagon through the stimulus location to the corresponding spectrum locus wavelength (Wyszecki and Stiles 1982). Brightness was measured as the sum of excitation values of the UV, blue and green receptors (Spaethe, Tautz et al. 2001). Spectral purity of the stimulus was calculated by the percentage distance of the stimulus in relation to the end of the spectrum locus (Chittka and Wells 2004). Chromatic contrast was calculated as the distance of a colour stimulus from the centre of the colour hexagon relative to the background. Chromatic contrast is important as perception can be affected by background colour (Lunau, Wacht et al. 1996). Green receptor contrast was measured as the green receptor excitat ion from a stimulus relative to the background (Giurfa, Nà ºÃƒ ±ez et al. 1995). This contrast is relevant as green receptors and green contrast are known to affect motion in bees (Srinivasan, Lehrer et al. 1987). Statistical analyses The impact of wavelength on number of landings by Trigona carbonaria was investigated using a single factor analysis of variance (ANOVA) and a post hoc Tukeys HSD test (ÃŽ ±=0.05) (Quinn and Keough 2002) using the number of landings as the dependent variable and wavelength of stimuli as the independent variable. Brightness, purity (saturation), chromatic contrast to the background and green receptor contrast of stimuli were analysed using the Spearmans rank correlation test against choices. Statistical analyses were conducted using R statistical and graphical environment (R Development Core Team, 2007). Statistical significance was set to P≠¤0.05. Part 3. Does a food deceptive orchid (Caladenia carnea) exploit the innate colour preferences of Trigona carbonaria? Plant model Caladenia carnea is a widespread species, common to eastern Australia. The orchid is highly variable in colour, ranging from pink to white. It is pollinated by Australian native bees of the Trigona species (Adams and Lawson 1993).With bright colours and fragrance, this orchid achieves pollination by food mimicry (Adams and Lawson 1993). Thus, due to the colour variation of the orchid, C. carnea is an excellent model with which to examine floral exploitation of potential pollinators. Caladenia carnea flowers were supplied by private growers from the Australasian Native Orchid Society. Can Trigona carbonaria perceive a difference between pink and white flowers of Caladenia carnea? Colorimetric analysis of the pink and white Caladenia carnea flowers were used to investigate whether different colours of the orchid would be perceived as similar or different to a bees’ visual system. A spectrophotometer was used to take four measurements of each flower colour (pink versus white). The actual measurements used in the analysis were an average of each colour (Dyer, Whitney et al. 2007). To predict the probability with which insect pollinators would discriminate between different flowers, these spectra were plotted as loci in a hexagon colour space (Chittka 1992) (see ‘hexagon colour space’ methods). Choice experiments I conducted trials testing the preferences of bees when offered a dichotomous choice between a white versus pink Caladenia carnea flower. Each trial took place inside a flight arena. Each white and pink flower used in a trial were matched for size, placed into indiviual plastic containers (diameter= 5 cm, height=5 cm) and placed in the arena with a distance of 10 cm between flower centres. Each container was covered with Glad WrapTM (The Clorox Company, Oaklands, CA, USA) to remove olfactory cues as they are known to in ¬Ã¢â‚¬Å¡uence the choice behaviour of honeybees (e.g. Pelz, Gerber et al. 1997; Laska, Galizia et al. 1999). Approximately 50 bees were let into the arena for each trial. The  ¬Ã‚ rst contact made by a bee with the Glad WrapTM within a distance of 4 cm, was recorded as a choice of that  ¬Ã¢â‚¬Å¡ower (Dyer, Whitney et al. 2007). The number of landings were recorded to the flowers for five minutes. After each trial, the Glad WrapTM was changed to prevent scent ma rks. In addition, individual flowers and spatial positions were randomised. Individual bees were sacrificed after each trial to avoid pseudo replication. Does the UV signal affect the attraction of bees to orchid flowers? To investigate whether the UV re ¬Ã¢â‚¬Å¡ectance of the dorsal sepal affected the response of bees, I offered bees the choice between two white orchids, one with a UV signal and the other without (N=16). The UV signal was removed by applying a thin layer of sunscreen (Hamilton SPF 30+, Adelaide, SA, Australia) over the dorsal sepal. Spectral reflectance measurements were taken to ensure that the sunscreen prevented any reflection of UV light (below 395 nm) from the sepals and did not change the reflectance properties of the orchid. In addition, spectral measurements of orchid sepals under Glad WrapTM confirmed that the foil was permeable to all wavelengths of light above 300 nm and did not obscure the reflectance of flowers. Do bees display preferences when choosing between pink versus white orchid flowers? To assess whether bees show a preference for pink or white variants of the orchid Caladenia carnea, I offered bees a simultaneous choice between a pink or white flower (N=16). See procedures for choice testing. Do bees habituate to non-rewarding orchids based on differences in floral coloration? I conducted a two stage experiment to investigate if bees could learn to habituate to a non-rewarding flower colour over time and whether bees adjusted their subsequent flower choice depending on the flower colour encountered previously. At stage 1 of the experiment, native bees were presented with one flower, either white or pink. Flowers were placed in a container with Glad WrapTM. Landings to the flower were recorded at the start and again at the 30 min mark. At stage 2, the flower from stage 1 was swapped with a new flower colour and the number of landings were scored for 5 minutes. Flowers were randomised and Glad WrapTM changed to prevent scent marks after each trial. Once again, bees were used only once per experiment. Statistical analyses For experiments 2, 3 4, numbers of landings by naive bees to flower pairs were compared using two tailed paired t-tests. A two factor ANOVA was used to analyse whether bees habituate to non-rewarding orchids based on differences in floral coloration. The dependent variable was the number of landings and the two independent variables were previous flower colour and new flower colour. 3. Results Part 1. Is there a link between hymenopteran vision and Australian floral coloration? Correlations between the inflection curves of different plant flowers and trichomatic vision of hymenopterans The analysis of 111 spectral reflection curves of Australian flowers reveals that sharp steps occur at those wavelengths where hymenoterans are most sensitive to spectral differences (fig. 4b). There are three clear peaks in sharp steps (fig. 4b). It is known that hymenopteran trichomats are all sensitive to spectral differences at approximately 400 and 500 nm (Menzel and Backhaus 1991; Peitsch, Fietz et al. 1992). Hence, the peaks at 400 and 500 nm can be discriminated well by hymenopteran trichomats, as illustrated by the inverse Δ ÃŽ »/ÃŽ » function (solid curve shown in fig. 4a) of the honeybee (Helversen 1972), which is an empirically determined threshold function which shows the region of the electromagnetic function that a bees’ visual system discriminates colours best. In summary, the spectral position of receptors of trichomatic hymenopterans are correlates with steps in the floral spectra of Australian flowers. The distributions of Australian flower colours according to bees’ perception The floral colour loci are strongly clustered in the colour hexagon (fig. 5a). Blue-green flowers are the most common in the perception of bees, while pure UV flowers were the rarest (fig. 5b). Part 2. Does an Australian native bee (Trigona carbonaria) have innate colour preferences? Effect of brightness, spectral purity, chromatic contrast and green receptor contrast on colour choices There was no significant effect of stimulus brightness on choice frequency (rs= 0.333, n=10, p= 0.347; fig. 7a). There was no significant effect of spectral purity on choice frequency (rs = 0.224, n=10, p= 0.533; figure 7b). There was no significant correlation effect of chromatic contrast on choice frequency (rs = 0.042, n=10, p= 0.907; figure 7c). There was no significant effect of green receptor contrast on choice frequency (rs = 0. 0.552, n=10, p= 0.098; figure 7d). Effect of wavelength on colour choices Stimuli colours are plotted in figure 8a, as they appear to a human viewer to enable readers to understand the correlation between colour choices. However, all statistical analyses were conducted with stimuli plotted as wavelength due to the different visual perception of bees and humans (Kevan, Chittka et al. 2001). There is a significant effect of wavelength on the number of landings by Trigona carbonaria (Single factor ANOVA, F9,110 = 5.60, P

Renaissance Man and Renaissance Women Essay -- essays research papers

Between the 1300s and 1500s, Europe experienced a period of cultural rebirth known as the Renaissance, marking the transition from medieval times to modern times. The Renaissance brought new importance to individual expression, self-consciousness and worldly experience. The Renaissance man and woman characterized the Renaissance ideals. A renaissance man was a well- educated gentleman who had cultural grace, courage and who understood the arts and sciences. On the other hand, a Renaissance woman was supposed to marry well, be loyal to her husband and give birth to boys. The most famous Renaissance man was Leonardo Da Vinci who was born on April 15th 1452 in Florence, Italy. Da Vinci was truly recognized by many to be a Renaissance child and later a Renaissance man because of his many talents. He revealed his artistic talents at the age of 17 when he was hired as a studio boy to Andrea Del Verrocchio, the leading Florentine painter and sculptor of his day. In Verrocchio workshop, Da Vinci was introduced to main techniques, from the painting of altarpieces and panel pictures to the creation of large sculptural projects in marble and bronze. His ‘’Last Supper’’ and ‘’Mona Lisa’’are among the most widely popular and influential paintings of the Renaissance. At the same time his scientific interests deepened: his concern with anatomy led him to perform dissections. After a period of time, Da Vinci’s scientific research began to dominate his other activities so much that his artis...

Lead Trial

INTRODUCTION Lead is a type of metal that is extremely toxic. It is used in the industries for the manufacture of various products like paint, gasoline etc. The chemical is also a component of products like ammunitions and batteries. Lead is a problem because of its dangerous and irreversible hazards. In the industry for instance, workers who are in constant touch with paints and gases stand a high risk of illness as a result of this chemical. It also poses danger especially on children whose weak bodies become vulnerable due to the devastating effects of lead. The control of lead levels and exposure to materials containing the chemical is inevitable. But with the application of the OSHA standards, it is anticipated that employees would not find their way into contact with this material. These standards require that employers should make their workplaces free of lead and other hazardous materials. Background Lead is a bluish chemical (when fresh) but grey (when exposed to the atmosphere). Its usage traces back to more than 6000 years. The metal does not easily rust and is also a poor conductor of electricity. It is found in the earth’s crust as an ore together with their metals like copper and zinc. Exposure to lead can lead to the damage of the nerves. It can also contribute to kidney problems especially nephrosis. Besides this, the chemical is also believed to be one of the greatest contributors to brain damages and also blood disorders. In children, an even low level of lead in their blood is harmful. It can cause retarded growth, IQ problems and hearing problems. It can ultimately lead to death of the infant. Sampling methods In order to find the lead levels in humans, sampling is carried out. Various methods are used like OSHA, MOSH, etc. THE OSHA METHOD OF SAMPLING LEAD This method incorporates filters that have got sampling pumps. After collection of these samples, analysis is done through emission spediometry or flame atomic absorption. Detection of specific metals can be through minute or bunk quantities. Tetramethyl and Tetraethyl compounds of lead can be analysed using In-House method as the stop gap procedure. Advances in techniques and different levels of exposure limits may render a given OSHA method inapplicable. The first step in analysis is to make bunk particles lesser i.e. grinding, or crushing to powder form. The samples are mixed with strong acid concentrates or if possible using de ionised water. The sample solution is then diluted, and exposed to atomic absorption or spectrophotometer rays. Through the measure of characteristic wavelength, it is possible to determine the element but after atomization and achievement of the excited stage of the atoms. Samples may be from the skin surface like the arms, hands or neck. A wise packet is torn open without touching the wire and given to the worker being evaluated. Employee is to remove the wipe from the package and unfold it. In the case of the hand, a person wipes the palms first and both sides of hand. This wiping is done for not less than 30 seconds using both sides of wire. For samples not from the skin, gloved hands are used to open wipe packet and unfold the wire. The designated surface for sampling is wired through repeated horizontal motions. The second wire is done at right angles to the first wire. The designated surface for sampling is wiped through repeated horizontal motions. The second wire is done at right angles to the first wire. It was noted that the employees did not wear separate work clothing or boots while at work. There is a common neglect of washing hands before drinking, eating or smoking. Some employees smoked near lead dust and fumes. Most of the times ,dry sweeping was done. The respirators worn at work were ill fitting, and worn out. The Californian lead exposure for workers in workplaces shows only 2.7% of facilities have participated in lead environment monitoring, laboratory based surveillance for lead poisoning in employees may mislead on the number of employees exposed. The Californian facilities that use lead are about 53,000. Around 240,000 employees in these factories are in lead related plant processes. This is only about 2.5% of the total Californian work force. Only 1.4% of lead- using process facilities and 2.6% facilities have the lead monitoring program. Employees in storage battery manufacture potentially exposed to lead are 1,950. Exposed individuals in the ship building repair, industry are 1,099 wending repair 312 people.  Significantly 107,322 employees are exposed below lead action level. However, 88,262 are exposed above action level/ Table showing lead exposure levels in air sampling data: The control measures recommended are to avoid spillage of lead-based oils and gasoline fumes be stored with facilities that have adequate ventilation systems. Lead process plants be enclosed and employees have sufficient respirator systems. Protective systems like using wet sweeping should be done and exposure to naked eye welding avoided.  Consistent supervision, while encouraging minimum exposure to lead and prohibiting of eating, drinking, smoking or cosmetic application in the working place should be some of the control measures. Administrative controls may target the schedule of working. Risk-prone, lead exposure e processes may be done when there are fewer workers at the facility. Also to protect the unborn, pregnant women may be assigned other work stages away from this (lead) contaminant. CONCLUSION The lead poisoning exposure levels are quite high given that about the employees exposed the results postulated show a figure that is not as accurate since less than half the facilities were sampled.  Lead, a heavy metal is absorbed into the digestive system whenever inhaled. Smaller particles of lead reach deeper in the lungs into the broad system. Lead damages body ability to make red blood cells.  Lead poisoning for the unborn and children can affect the child’s ability to use vitamin D and calcium. It can retard the kid’s brain, nervous system and red bone marrow. Individuals having lead exposure levels that are active levels require chelate treatment. Lead exposed men have been noted to have problems like low fertility, erectile dysfunction and brain defects. Among women, incidences of still births, miscarriages and social skill problems in the offsprings are rampant. Substitution of lead for safer elements and change of process to minimize lead exposure for employees at the facility is necessary. Ventilation systems should be installed to reduce the amount of lead in air or dust. Isolation can be done by reducing the number of people present during lead processing. Good hygiene should be enforced. Most importantly, protective clothing, detection gadgets should be applied. REFERENCES Binns HJ, Kim D, Campbell C. Targeted screening for elevated blood lead levels: populations at high risk.2002, Mc ghill, USA.  Gorstein J, Sullivan K, Yip R, et al. Issues in the assessment of nutritional status using anthropometry. Bull World Health Organ 1994; PubMed-Cental, USA. United Nations System/Standing Committee on Nutrition. Nutrition information in crisis situations. Geneva, Switzerland: Secretariat of the UNS/SCN; May 2004. US Consumer Product Safety Commission. Ban of lead-containing paint and certain consumer products bearing lead-containing paint, American public health Association, USA.      

Fabricating Humans essays

Fabricating Humans essays Cloning is unethical and is not needed in society. Many, if not all, religions agree with the ban of cloning human beings. It has also been argued that cloning would diminish individuality as well. Whether or not cloning is ethical, at this time cloning human beings should be, and is, banned. Humans have evolved since the beginning of time, getting smarter and adapting more to the environment in which they live. Humans have evolved so much that we now know how to make copies of our genes, the special codes that make up our physical strengths and weaknesses. It has been argued that cloning would help to rid disease and physical impurities which are unwanted. However, like humans diseases and viruses also evolve changing to the environment in order to stay alive longer. As rabbi Bernard King of Irvine, California asked, Can the cloning create a soul? (qtd in Rottenburg 225). Many religions believe that humans have an everlasting soul, which lives on after life. Scientists do not create a soul, God does. God gives life and he takes it away. Humans without souls would be used as nothing but slaves as stated by the Catholic priest Father Sanders (Rottenburg 225). Individuality would be abolished if the human genome was duplicated. The would be multitudes of identical or similar types of bodies, less distinct, less unique, and less sovereign (Rottenburg 230). The idea of a perfect human would be met, whether it is a blonde hair blue-eyed girl or a boy with a washboard stomach. People would become drones and would be produced in order to fill the needs that society sees fit. Clones would be told what they were, what they are, and what they will become. They will have no say in their life, they would be instructed what job they will do and would be made with the features needed to excel in it. Cloning would ruin some of the qualities of being alive. In addition, what woul ...