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» Browse Science and Environment Term Papers
Global Warming
Number of Words: 699 / Number of Pages: 3
... by land-based weather stations show an increase of about 0.45 degrees Celsius over the past century. This may be no more than normal climatic variation...and several biases in the data may be responsible for some of this increase."
- Satellite data indicate a slight cooling in the climate in the last 18 years. These satellites use advanced technology and are not subject to the "heat island" effect around major cities that alters ground-based thermometers.
- Projections of future climate changes are uncertain. Although some computer models predict warming in the next century, these models are v ...
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Quantum Theory?
Number of Words: 966 / Number of Pages: 4
... between these quanta are called quantum foam; it is through these spaces that entities are destroyed and simultaneously reconstructed by teleportation, thus “moving” the entities to different places in our universe and helping them travel to other universes.
In the novel, scientists discover that the proves the existence of multiple universes. The realization that these other “dimensions” exist totally alters their views of life on earth and of scientific concepts of the past. They become wrapped up in the mysterious ability to travel between universes and commit a potentially egregious error by igno ...
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The Positive Effects Of DDT
Number of Words: 1873 / Number of Pages: 7
... on the pesticide have alleged, the benefits of DDT far exceed the
flaws.
DDT was first synthesized in 1887 and patented as an insecticide in
1939 by a Swiss chemist, Dr. Paul Müller (Whelan 69). It initially became
popular because of its effectiveness against insects, specifically clothes
moths and parasites of both animals and plants. DDT was welcomed as a
substitute for toxic insecticides like arsenic, mercury, fluorine, and lead
(Whelan 70). It was used by the Allied troops during World War II in order
to kill body lice without having harmful side-affects on humans. The ...
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Mycardial Infarction
Number of Words: 1420 / Number of Pages: 6
... cyanosis, a drop in blood pressure, and a drop in body temperature. A rapid and irregular pulse may also be a sign of a resent MI.
In the beginning of the twentieth century, bedrest was the only thing that could be done for heart attacks. Then nitroglycerin was found to restore coronary circulation and relieve the pain. Digitalis was found effective for treating abnormal heart rhythms and diuretics were found effective to remove water, which reduced hypertension. With these and many other treatments, cardiology became one of the most dramatic fields in medical history (Kenneth, 674).
Another big con ...
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Classification
Number of Words: 1136 / Number of Pages: 5
... Born in 1707, he had a mind that was orderly to the extreme.
People sent him plants from all over the world, and he would devise a way
to relate them. At the age of thirty-two he was the author of fourteen
botanical works. His two most famous were Genera Plantarum, developing an
artificial sexual system, and Species Plantarum, a famous work where he
named and classified every plant known to him, and for the first time gave
each plant a binomial. This binomial system was a vast improvement over
some of the old descriptive names for plants used formerly. Before Linnaeus,
Catnip was known as: "Ne ...
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Essay On Metals
Number of Words: 1159 / Number of Pages: 5
... harder alloys.
The disadvantages are clear. The price is high and in its pure form
it's so soft it wears quickly from the purely mechanic rubbing of your skin
and of other jewellery.
The common solution, however, is not without its flaws. "Cutting"
the gold with cheaper metals can mean dramatic savings in material cost and
highly improved resistance to wear but we must remember that it also
changes the other special property of gold - its resistance to corrosion.
Some chemicals in more-or-less popular use in body-piercing circles
(Betadine, to be specific) will tarnish "gold" of as high as 18 K, t ...
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Dangers Of Steriods
Number of Words: 445 / Number of Pages: 2
... marijuana or
cocaine. A ten week cycle of testosterone cypinate and methandrostone
costs only about one hundred dollars. Steroids are also very hard to
trace because of their water base composition. They can pass through
the body within two days. All these benefits of steroids help an
athletes become more competitive and increase their chance of being a
winner. Of course everybody wants better biceps and triceps but when
using steroids to achieve this goal there is a large price to pay.
However, steroids should remain illegal because they
physically deteriorate the whole bo ...
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Ants, Little But Mighty
Number of Words: 1728 / Number of Pages: 7
... and pupates. In a few
more weeks, adult workers emerge. It is their job to hunt
for food and make the nest bigger.
More workers will develop and the colony gets very
organized. The new workers will completely take over as
caretakers of the eggs, larvae, and pupae. Now the queens
only duty is to lay more and more eggs, thousands of them
in her lifetime. Many wingless workers develop and help to
enlarge the nest into an intricate network of tunnels and
chambers that will eventually house thousands of ants.
When the colony becomes well established, the queen
begins to lay some eggs that ...
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Extra-sensory Perception
Number of Words: 1599 / Number of Pages: 6
... Research (1882) which sought to distinguish psychic phenomena from spiritism and to investigate mediums and their activities." (http://wheel.ucdavis.edu) The research started over one hundred years ago and their goal was to understand why unexplainable phenomena was occurring. "Modern experiments, notably at Duke University under Joseph Banks Rhine, in Britain at the Society for Psychical Research and in Russian research labs, have concentrated principally on extrasensory perception, psychokinesis, and astral projection." (http://wheel.ucdavis.edu) J.B. Rhine did experiments in the field of extra s ...
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Asymmetric Epoxidation Of Dihydronaphthalene With A Synthesized Jacobsen's Catalyst
Number of Words: 2135 / Number of Pages: 8
... Jacobsen's Catalyst Jacobsen's catalyst opens up short pathways to
enantiomerically pure pharmacological and industrial products via the
synthetically versatile epoxy function .
In this paper, a synthesis of Jacobsen's catalyst is performed (Scheme
1). The synthesized catalyst is then reacted with an unfunctional alkene
(dihydronaphthalene) to form an epoxide that is highly enantiomerically enriched,
as well as an oxidized byproduct.
Jacobsen's work is important because it presents both a reagent and a
method to selectively guide an enantiomeric catalytic reaction of industrial
and ...
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