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» Browse Science and Environment Term Papers
Aids 4
Number of Words: 3029 / Number of Pages: 12
... quickly than in other populations. It became to be thought of as a "gay disease". Because the disease is spread primarily by exposure of ones blood to infected blood or semen, I.V. drug addicts who shared needles were soon identified as an affected group. As the AIDS epidemic began to affect increasingly large fractions of those two populations (gay males and IV drug abusers), many of the rest of this society looked on smugly, for both populations tended to be despised by the "mainstream" of society here.
But AIDS is also spread by heterosexual sex. In addition, it is spread by blood transfusions. Ne ...
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Depression
Number of Words: 827 / Number of Pages: 4
... & Hockenbury, 1998). Individuals who suffer from this form of is overwhelmingly sad. Often, sadness is accompanied by feelings of quilt, worthlessness, inadequacy, emptiness, and hopelessness, even though these individuals are surrounded by friends and family, they feel along and disconnected from others (A. Schwartz, & R.M. Schwartz, 1993). Some behavioral characteristics that can exit are crying for unknown reasons, stop participating in activities that were enjoyable at one time, suffer from low self-esteem, memory might become impaired and what once an easy task is now difficult task to ...
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Cloning 2
Number of Words: 946 / Number of Pages: 4
... namely the
procedures used to create a new organism whose genetic constitution is a replica of
another existing individual. Such a feat can be achieved by substituting the nucleus, which
contains the genes, from one of the cells making up that individual's body, for the nucleus
of a fertilised egg.
Since our genes dictate to a large extent what we look like, how we behave and what we
can and cannot do, having identical genes, as identical twins do, ensures something more
than mere similarity. Novelists and film makers have not been slow to exploit the imagery
afforded by cloning. Limitl ...
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Superconductivity
Number of Words: 1633 / Number of Pages: 6
... amount of energy. Electrons can
move between different levels and between different materials but to do that,
they require the right amount of energy and an "empty" slot in the band they
enter. The metallic conductors have a lot of these slots and this is where the
free electrons will head when voltage (energy) is applied. A simpler way to look
at this is to think of atoms aligned in a straight line (wire). if we add an
electron to the first atom of the line, that atom would have an excess of
electrons so it releases an other electron which will go to the second atom and
the process repeats again and a ...
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Insomnia
Number of Words: 1101 / Number of Pages: 5
... or Maintaining Sleep). Several surveys have tried to pin down the exact cause of sleep problems. Of 1,000 households, one third had someone with current problems and in 42 percent someone had suffered from sleep disorders at sometime. Some doctor's polls have been revealing yet somewhat disparate. In one survey, roughly 19 percent of the patients seen by the 3,000 doctors had complaints of some type of . That figure may actually understate the case, for some say that more people in the United States visit doctors for help in getting to sleep than any other single complaint. It is also estimated ...
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The Beginning Of The Universe
Number of Words: 1285 / Number of Pages: 5
... was no beginning in the past, nor will there be
change in the future. This model assumes the perfect cosmological
principle. This principle says that the universe is the same everywhere on
the large scale, at all times.2 It maintains the same average density of
matter forever.
There are observational evidences found that can prove the Big Bang
model is more reasonable than the Steady State model. First, the redshifts
of distant galaxies. Redshift is a Doppler effect which states that if a
galaxy is moving away, the spectral line of that galaxy observed will have
a shift to the red end. The ...
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Apollo 4
Number of Words: 1112 / Number of Pages: 5
... tubing carried a glycol cooling
fluid, which is not flammable, but when exposed to air it turns to flammable
fumes. The capsule was filled with pure oxygen in an effort to allow the
astronauts to work more efficiently. It also turns normally not so flammable
items to highly flammable items. Raschel netting that was highly flammable in
the pure oxygen environment was near the exposed section of the wires.
At 6:31:04 p.m. the Raschel netting burst into an open flame. A second
after the netting burst into flames, the first message came over the crew's
radio channel: "Fire," Grissom said. Two S ...
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Muscles In The Human Body
Number of Words: 859 / Number of Pages: 4
... heat needed in the body.
Skeletal muscle tissue is made up of smaller fibers called myofibrils. These myofibrils are composed of even smaller protein filaments. These filaments can be either thick or thin. The thick filaments are made of the protein myosin, and the thin filaments are made of the protein actin. The arrangement of the myosin and actin gives skeletal muscle its striated (or striped) appearance.
Each section of a myofibril is called a sarcomere, and is the functional unit of muscle.
How muscles contract is directly related to their structure. The sliding filament theory is an explan ...
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Silverfish
Number of Words: 308 / Number of Pages: 2
... conditions, the eggs hatch in two weeks, but may take up
to two months to hatch. The young nymphs are very much like the adults except
for size. Several years are required before they are sexually mature, and they
must mate after each molt if viable eggs are to be produced. Populations do not
build up rapidly because of their slow development rate and the small number of
eggs laid.
ECONOMIC IMPORTANCE: Silverfish sometimes feed on book binding and the paste
that holds on wall paper causing damage to many houses.
IS IT A SOCIAL INSECT? Yes I think that the Silverfish is social because it
lives i ...
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Environmental Pollution
Number of Words: 1277 / Number of Pages: 5
... harm them. People burn down
forests and people burn fossil fuels, and CFCs from aerosols. Every bit of this
harms our atmosphere. Factories and transportation depend on huge amounts of
fuel billions of tons of coal and oil are consumed around the world every year.
When these fuels burn they introduce smoke and other, less visible, by-products
into the atmosphere. Although wind and rain occasionally wash away the smoke
given off by power plants and automobiles, the cumulative effect of air
pollution poses a grave threat to humans and the environment. A big example of
smog is LA you can see the smog jus ...
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