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» Browse Science and Environment Term Papers
Light: A Fundamental Force In Our World
Number of Words: 892 / Number of Pages: 4
... Light, however, also exhibits qualities
characteristic of particles such as neutrons and protons. A photon, or
quanta, is the "packet" of energy that is sent in a light wave. Like a
particle, the photon is believed to have a finite mass, and has the ability
to affect other matter. As light strikes a photovoltaic solar cell, it
knocks electrons in the silicon atoms on the surface into a higher state of
energy. When these return to their normal, or "ground" state, energy is
produced in the form of electricity. Thus, light is termed a "wave-
particle," and this property is called the "wave-particle dua ...
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Anxiety Disorders
Number of Words: 1198 / Number of Pages: 5
... of anxiety. A panic attack is characterized by unpredictable attacks of severe anxiety with symptoms not related to any particular situation. (Hale, 1886). The person experiencing the attack may not be aware of the cause. Symptoms include four or more of the following: pounding heart, difficulty breathing, dizziness, chest pain, shaking, sweating, choking, nausea, depersonalization, numbness, fear of dying, flushes, fear of going crazy.
Heredity, metabolic factors, hyperventilation, and psychological factors may contribute to anxiety causing panic attacks. (Hale, 1886)
Panic disorder tends to run ...
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Leprosy
Number of Words: 351 / Number of Pages: 2
... since people loose feeling in certain areas of their body, injuries occur to them that are unnoticed and become infected. After the disease has settled into ones body it starts to eat away at thebones causing people to loose parts of their body. All of these signs can be prevented with early detection.In the past chaulmoogra oil was used, thinking that it would make a good
treatment for . In today's world there are many drugs that are used to prevent it.The drugs are the best way to stop it from spreading. Another way is to watch that youget good nutrition.Doctors have made many great advancements i ...
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An Agricultural Movement
Number of Words: 1735 / Number of Pages: 7
... to control pests is sufficient to support their use. (16).
Even so, pesticides have been used for centuries. In James Whorton’s book, Before Silent Spring, he describes agriculture before the Industrial Revolution. He writes that farmers in the 1800's used arsenic and sulphur to stop insects and molds from harming their crops. Even then it was known that arsenic caused skin lesions, nausea, vomiting, diarrhea, and swollen, painful hands and feet. In England in the late 1800's, arsenic was found in contaminated sulphuric acid, used then to make glucose for “cheap beer”. People in the poorest ...
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Evolution Theory
Number of Words: 534 / Number of Pages: 2
... each island and were adapted to local conditions. The reaction to this theory was immediate. Biologists argued that Darwin could not prove his hypothesis. Other criticised his ideas of variation and how he could not prove how these variations came about or how they were passed on. This part of his theory was not answered until the birth of modern genetics in the early 20th century. In fact many scientists had doubts about this theory for 50-80 years. The most publicised attacks came from religious opponents who believed it was impossible for humans to be on the same level as animals.
Jean-Baptiste ...
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Gene Therapy 2
Number of Words: 3631 / Number of Pages: 14
... the body. Without at least one properly functioning gene, children have no way of converting deoxyadenosine (a waste product) into inosine. This leads to the rapid build-up of deoxyadenosine in the system, which becomes phosphorlyzed into a toxic triphosphate, which kills T-cells. The result is an almost complete failure of the immune system and early death.
Previous treatment options included bone marrow transplants, which worked well with matched donors. A major breakthrough occurred with the development of polyethylene glycol coated ADA (PEG-ADA). This treatment introduces coated ADA into the ...
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The Human Eye In Space
Number of Words: 907 / Number of Pages: 4
... the low humidity and cloudless
areas such as the Himalaya mountain area.... I saw a steam locomotive by
seeing the smoke first..... I also saw the wake of a boat on a large river
in the Burma-India area... and a bright orange light from the British oil
refinery to the south of the city (Perth,Australia.)"
The above observation was made by Gordon Cooper in Faith 7 [1963] and
which generated much skepticism in the light of the thesis by Muckler and
Narvan "Visual Surveillance and Reconnaissance from space vehicles" in
which they determined that a visual angle of ten minutes was the
operational minimum ...
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Black Holes 2
Number of Words: 874 / Number of Pages: 4
... speed of light. The distance from the black hole at which the escape velocity is just equal to the speed of light is called the event horizon. Anything, including light, that passes across the event horizon toward the black hole is forever trapped.
Using a small black marble as an example to represent the size that the Earth would become if it collapsed and became a black hole, Todd R. Lauer, of the National Optical Astronomy Observatories said, " Black holes are very messy eaters. If you took that marble to an 'all-you-can-eat buffet' allowing it to consume all the matter around it, the feeding fre ...
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The Hale Bopp Comet
Number of Words: 771 / Number of Pages: 3
... a comet, since I had
been looking at M70 last month, and *knew* there wasn't any other objects
there."
Thomas Bopp explains his story like this, "On the night of July 22, 1995
some friends and I headed out into the desert for a dark of the moon observing
session. The site, which is west of Stanfield, AZ and a few mile south of
Interstate 8 is about 90 miles southwest from my home.
My friend Jim Stevens had brought his 17-1/2" Dobsonian. We started the
evening observing some of the Messier objects such as the Veil and North
American Nebulae in Cygnus, when Jim said " Let's look at some of the ...
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Genetics
Number of Words: 1910 / Number of Pages: 7
... twinning, or causing the embryo to split apart. It is much easier to clone with embryonic cells. Much later, mammals such as sheep were cloned using this process. (Nash 64)
In 1970, John Gurdon repeated the procedure suggested by Hans Spemann. This time, the experiment yielded partial success. The tadpoles were born alive, but they died when they began to feed. He showed that transplanted nuclei reverted to an embryonic state.
In the early 1980's, there was some controversy over the reported cloning of mice. Karl Illmensee and Peter Hoppe claimed that they had cloned mice from embryos. Other ...
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