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» Browse Science and Environment Term Papers
Attention Deficit Hyperactivity Disorder
Number of Words: 1388 / Number of Pages: 6
... patients display
their symptoms. Boys are more likely to have the disorder than girls. The
symptoms of ADHD usually decrease with age, but those symptoms related
with other similar disorders are said to increase with age. 30-50% of
children with ADHD may display symptoms, although often times less
severe, into adulthood.
ADHD may be observed in children before the age of four, but it’s signs
are often missed until the child begins school. ADHD is often accompanied
by learning difficulties, excessive physical activity, impulsive actions,
inattention and social inappropriateness. Many of ...
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Smuggling Of Nuclear Material
Number of Words: 983 / Number of Pages: 4
... centralized military system and operating within
a strong political authority. The workers back then where well disciplined and
each individual new his/her role. The workers were among the best treated and
loyal to the Russian military. They are now suffering hardships and are forced
to scavenge anything to pay for their food, rent and social services.
A new trend is already occurring with some of the workers . There are
those that will seek employment out of the nuclear field and in the commercial
sector, where salaries are higher. Then the unfortunate who lose their jobs and
find no work. The ...
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Preserving Our Earth
Number of Words: 365 / Number of Pages: 2
... home and into the havoc that is ours. Millions of acres of
beautiful land are destroyed daily to satisfy the needs of mankind.
But has anyone contemplated the needs of our wildlife? When their homes
are incinerated, where do they run for shelter? Where will wildlife obtain its
food and oxygen if the sources are gone? Not much is done about our destructive
ways, we sit back and let money and greed take power. The solution is just a
whisper away. The preserved areas should remain untouched. Hunting should be
outlawed in these protected lands. If a family is starving and has to resort to
th ...
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Lung Cancer 3
Number of Words: 1428 / Number of Pages: 6
... it will spread. Cancerous cells lack the sticky coating that causes normal healthy cells to stay together because cancerous cells lack it they can break off and implant somewhere else in the body. The cancerous cells that break off from the primary tumour are usually carried through the blood. What causes cancer cells to be abnormal? They create extra chromosomes and more DNA then normal cells do.
Lung Cancer
What usually happens with lung cancer is that the cilia in your throat that usually help keep chemicals and other harmful particles out are destroyed sometimes by smoking or if you wor ...
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Dna
Number of Words: 977 / Number of Pages: 4
... of each nucleotide is also linked to the deoxyribose of the adjacent nucleotide in the chain. These linked deoxyribose-phosphate subunits form the side rails of the ladder. The bases face inward toward each other, forming the steps of the ladder.
The nucleotides in one strand have a specific association with the corresponding nucleotides in the other strand. Because of the chemical affinity of the bases, nucleotides containing adenine are always paired with nucleotides containing thymine, and nucleotides containing cytosine are always paired with nucleotides containing guanine. The complementary ba ...
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Ebola Virus
Number of Words: 1098 / Number of Pages: 4
... was really Ebola.
The first recorded outbreak of the Zaire string of the Ebola virus was in Zaire, in 1976. The doctors didn't know how to treat it and that meant that
they didn't know how to contain it either. As infected people met in public places the virus spread. In Western Sudan, the same year, the Sudan string
of the Ebola virus emerged with similar results. Both casts together had about a total of 550 infections and around 340 deaths (about 60% death rate).
The virus' then lay dormant till 1979, when Sudan was again hit with 34 infections and 22 deaths. In the outbreak, as before, ...
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Geothermal Energy 2
Number of Words: 827 / Number of Pages: 4
... between 300 and 700 degrees Fahrenheit, is brought from an underground reservoir to the surface and is converted to steam by using changes in pressure. The steam and liquid are separated, with the steam turning turbines (generating electricity) and the water is injected back into the reservoir to maintain the chamber's pressure.
Sometimes the hot water is used directly for home, and sometimes greenhouse, heating. It is also used to speed up the growth of aquatic animals (aquaculture).
II. Dependency on Geothermal Energy
Although we (the United States) are not taking advantage of all of the geother ...
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Fusion: Our Future's Energy?
Number of Words: 967 / Number of Pages: 4
... health concern and needs to be disposed of. Another problem is the energy it needs. It uses an element that is hard to find and which will eventually run out. Also, the reaction cannot be easily stopped and if it can't be stopped, a nuclear meltdown can occur. This is a serious environmental concern.
Fusion is different. It is a process that combines two nuclei into one, releasing an amount of energy that is far greater than that of fission. In a common type of reaction, two isotopes of hydrogen, deuterium and tritium fuse together, making helium and a neutron. A small amount of the mass pr ...
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Genetic Diversity In Agriculture
Number of Words: 709 / Number of Pages: 3
... plants but the
encroachment of civilization has reduced the natural variability inherent in
primitive plant forms and related species of crop plants. Agricultural process,
as a result of new breeding programs, has reduced rather than increased crop
variability as improved cultivars, or varieties, are planted in wider and wider
areas and old cultivars, which may contain valuable genes, are lost. Crop
failures, which result in a smaller gene pool, have led to an increased
awareness of the need to preserve genetic diversity in plants. Efforts are
under way to increase collections of plant materials ...
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Nuclear Weapons
Number of Words: 955 / Number of Pages: 4
... to fuse at very high temperatures into
heavier nuclei, releasing energy and a neutron. In order to squeeze the two
nuclei together, an atomic fission bomb is usually used. A fusion reaction
releases about four times more energy per unit mass than a fission reaction.
The United States supervised the development of the atomic bomb under the code
name Manhattan Project, during World War II. The first nuclear chain reaction
occurred in December 1942, at the University of Chicago. Soon after the first
bomb test, atomic bombs were dropped on the Japanese cities of Hiroshima and
Nagasaki in 1945. The fi ...
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