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» Browse Science and Environment Term Papers
Alcoholism And Drug Abuse
Number of Words: 1510 / Number of Pages: 6
... in another frame of mind. The body, in most instances, craves a minute amount of the chemical to balance its desires; however, the mind says, "If a little is good, a lot is better."
Others chose drugs as substitutions for self-confidence, solutions to problems, relaxation, freedoms from anxiety, self-esteem, and satisfying feelings. Whatever the incentives may be, it is apparent that all of the reasons why people chose to do drugs have to do with changing how they feel; they are about avoiding boredom or solitude, or feeling significant, part of a group, tranquil, or "good".
Unfortunately, people ...
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Acid Rain
Number of Words: 1940 / Number of Pages: 8
... found the problem it was already very large. Detecting an acid lake is
often quite difficult. A lake does not become acid over night. It happens over a
period of many years, some times decades. The changes are usually to gradual for
them to be noticed early.
At the beginning of the 20th century most rivers/lakes like the river
Tovdal in Norway had not yet begun to die. However by 1926 local inspectors were
noticing that many of the lakes were beginning to show signs of death. Fish were
found dead along the banks of many rivers. As the winters ice began to melt off
more and more hundr ...
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Endocrine Disruptors
Number of Words: 1702 / Number of Pages: 7
... likely to be encountered in the environment. However the process of bioaccumulation can result in top-level predators such as humans to have contaminants at levels many million times greater than the environmental background levels (Guilette 1994). In field studies, toxicity caused by endocrine disruption has been associated with the presence of certain pollutants. Findings from such studies include: reproductive disruption in starfish due to PCBs, bird eggshell thinning due to DDT, reproductive failure in mink, small penises in alligators due to DDT and dicofol (Guillette 1994, Colburn et al 1996). ...
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Circulation Systems Over China
Number of Words: 1879 / Number of Pages: 7
... For any fluid to initiate movements, pressure
gradient must exists. Therefore, for a close understanding of the circulation
system that operates over China, we should start from discussing the seasonal
pressure distribution at sea-level over the Asia-Pacific region, which is the
driving force for the air movements in China. Most clearly to be seen, the
largest difference in the atmospheric pressure occurs between winter and summer,
whereby January and July can be considered as representative months. In January,
a typical cold anticyclone with central pressure above 1,040 hectopascals (hPa)
developed o ...
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Bioethics
Number of Words: 1691 / Number of Pages: 7
... for abuse, all
experimentation should be banned? This would mean that society would be
condemned to remain at the same level of knowledge (status quo)?
Bioethically speaking, how far can we go in the study of the human
without crossing the line? The fundamental question is, since we are the ones
drawing the line, where do we draw it?
The purpose of this essay is to provide a clear sense of the present law
on this issue. Second, to review the problems raised by experimentation on
animals. To show some different examples of bioethics. Third, to show the
biblical view of the matter. Finally, t ...
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Blood Doping
Number of Words: 809 / Number of Pages: 3
... usually, is felt after a hard or long workout. Fatigue usually sets in with the onset of lactic acid production. Oxygen is carried to the muscle by two delivery systems. Three percent of oxygen is carried in plasma and ninety-seven percent is in hemoglobin, the principal protein in erythrocytes (red blood cells). If hemoglobin amounts are increased, this will lead to increased oxygen levels that can be transported to the muscles. Allowing the muscles to become more fatigue resistant.
could have opposite effect of those intended. A large infusion of red blood cells could increase blood thickne ...
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Laziness
Number of Words: 1951 / Number of Pages: 8
... with
psoriasis. Early psoriatic changes occur in advancing lesions before the
accumulation of inflammatory cells. These changes are mediated by
activated CD4+ T lymphocytes and can be detected before visible pathology
to the skin occurs. Activated T lymphocytes exhibiting an increase in
HLA-DR and IL-2R can be seen in close proximity to Langerhans cells in the
dermis before lesion formation. Since Langerhans cells are antigen
presenting cells, activation of the T cells may occur by the recognition
of an as-yet unidentified antigen in the context of MHC class II. These
activated T lym ...
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Crystals: Does Surface Tension Affect The Process Of Crystallization?
Number of Words: 1915 / Number of Pages: 7
... how is the formation disturbed if only
one of the condition would happen to be modified? Most crystals are formed
under water or under liquids with similar characters to water; and tend to
form under liquids or solutions containing a maximum amount of solute. If
the liquid absorbs additional solute, then the solution is supersaturated.
If a tiny crystal, called a seed crystal, is added to the substance, a
chain reaction would occur where the crystal growth will grow dramatically.
In the case of the experiment, a staple is used instead of a crystal so
that the crystal can be easily removed at the end ...
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Dolphins 2
Number of Words: 3526 / Number of Pages: 13
... song. When he was finished with his song, he jumped overboard and was saved by a dolphin which carried him two hundred miles to shore. Obviously, dolphins and humans have been interacting together throughout recorded history.
According to the theory of evolution, it is most likely that the dolphin was once a land mammal. It is likely that sixty million years ago a cow, the distant cousin of the dolphin, decided to take his life to the sea. This is shown by the findings of hooves on dolphin fossils.
The appearance of dolphins has intrigued man’s interest in the physical makeup of these mammals. Dol ...
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Acid Rain
Number of Words: 1942 / Number of Pages: 8
... the scientist found the problem it was already very large.
Detecting an acid lake is often quite difficult. A lake does not become
acid over night. It happens over a period of many years, some times decades.
The changes are usually to gradual for them to be noticed early.
At the beginning of the 20th century most rivers/lakes like the river
Tovdal in Norway had not yet begun to die. However by 1926 local inspectors
were noticing that many of the lakes were beginning to show signs of death.
Fish were found dead along the banks of many rivers. As the winters ice
began to melt off more and more ...
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