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» Browse Science and Environment Term Papers
Biological And Physical Process Of Aging
Number of Words: 645 / Number of Pages: 3
... down, thereby decreasing the amount of energy that is being supplied to the cell.
This cellular degeneration may be set into action by highly reactive chemicals known as free radicals. These molecules have an unpaired electron in the outermost valence shell. This causes the molecule to grab electrons from other molecules, setting into motion a chain reaction that destabilizes them, and causes death of the cell. These free radicals are the normal by-product of metabolism, and can also form due to exposure to radiation or toxic chemicals. Enzymes that usually inactivate these free radicals dimi ...
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Nuclear Weapons
Number of Words: 461 / Number of Pages: 2
... tested by the United States
near Alamogordo, New Mexico. In the final stages of World War II, the U.S.
dropped atomic bombs on Hiroshima and on Nagasaki three days later to force
Japan to surrender. The explosion produces great amounts of heat, a shock
wave, and intense neutron and gamma radiation. The region of the explosion
becomes radioactively contaminated, and wind-borne radioactive products may
be deposited elsewhere.
The hydrogen bombs an explosive weapon of enormous destructive
powercaused by the fusion of the nuclei of various hydrogen isotopes in the
form of helium nuclei. A hy ...
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Cosmetology
Number of Words: 504 / Number of Pages: 2
... to get schooling to be a cosmetologist. You
could go to either a public or private vocational school, which some high
schools offer. You could also go to a beauty school. You must be 16 or
older to go to a beauty school. In your classes your training courses may
include lectures, demonstrations and practice. Students usually practice
with mannequins. After schooling, you must take a state licensing exam
consisting of written and practical parts. You renew that license every
two years by taking the test again each time.
You get a lot of experience in the vocational school, but some
shops still ...
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The Potential Effects Of A Depleted Ozone Layer
Number of Words: 2351 / Number of Pages: 9
... are released, " the ozone layer would be weakened to such an extent
that it does not filter out the sun's invisible and dangerous ultraviolet rays "
( Jones, 1992, p.36 ). Such a scenario would drastically alter society and the
environment. Ozone depletion has been described as " potential
catastrophe " and " a planetary time - bomb " ( Way, 1988, p.9 ). The four main
areas affected by a depleted ozone layer and thus by the corresponding increase
in harmful ultraviolet radiation are agriculture, wildlife, the environment, and
human health. A depleted ozone layer has a profoundly negative and potentia ...
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Chromatography
Number of Words: 666 / Number of Pages: 3
... a solvent. Typical stationary phases (and their interactions with solutes) are: solids (adsorption), ionic groups on a resin (ion-exchange), liquids on an inert solid support (partitioning), and porous inert particles (size exclusion). The mixture to be separated is loaded onto the top of the column followed by more solvent. The different components in the sample mixture pass through the column at different rates due to differences in their partition behavior between the mobile phase and the stationary phase. The compounds are separated by collecting aliquots of the column effluent as a function of tim ...
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Climatic Change And Its Effect On Society
Number of Words: 844 / Number of Pages: 4
... in this region. climate modellers have
predicted a large increase in temperature for this region, which could lead to
even drier conditions and enormous stresses on vegetation in the western
Canadian boreal forest. This type of impact was observed following the 1988
drought it experiences, when there was a die-back of aspen over extensive areas
of the aspen parkland in Western Canada. Associated with this drought was a
drying up of large lakes in the region. Another potential impact for the region
is a major increase in forest fires. This is due to the fact that fire frequency
is closely linked to mo ...
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Acid Rain
Number of Words: 795 / Number of Pages: 3
... like the
river Tovdal in Norway had not yet begun to die. However by 1976 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 hundreds upon hundreds more
dead fish were being found. As scientists continued to work they found many
piles of dead fish, up to 5000 in one pile, further up the river. Divers
were sent in to examine the bottom of the rivers. where they found many
more dead fish. Many live and dead specimens were taken back to labs across
Norway. Whe ...
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Larnyx Cancer
Number of Words: 522 / Number of Pages: 2
... coughing or a feeling of a lump that doesn’t go away are also signs of larynx cancer. Tumor development in the subglottis is very unusual and rare. As a tumor grows it may
cause pain, weight loss, bad breath, frequent choking on food, and hard swallowing. Only qualified doctors are able to tell if any of the signs are really symptoms of the cancer.
A person with larynx cancer can be treated according to the person’s age, general health, and preferences. The size of the tumor, location of the tumor, and whether the cancer has spread or not also plays a major role in determining the ...
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Magnesium
Number of Words: 518 / Number of Pages: 2
... Valence states Mg2+
Viscosity 1.25 cp at 650�C (1)
The magnesium element has the atomic number of 12 and atomic weight of
24.3050. It's symbol is Mg. The group number that mg is in is group 2a.
It's electronic configuration of
[Ne].3 s2.
Physical data
Standard state: solid at 298 K
Colour: silvery white
Density of solid at ambient temperature/kg m-3: 1738
Molar volume/cm3: 14.00
Table on isotopes:
Nominal mass Accurate mass% natural abundance
24Mg 23.9850423 (8) ...
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Dinosaurs 2
Number of Words: 940 / Number of Pages: 4
... knife (Benton 161). It mainly relied on its strength when catching prey. Because it could not swim, many of its prey would run for shelter into water. Also, the Tyrannosaurus Rex
was able to take big breaths due to lots of lung capacity, but it tired easily and could not put up much of a chase when its prey ran. (Monatersky 287).
The Tyrannosaurus Rex was an exciting discovery. It was found during the Bone Wars, a period when Paleontology was very popular and competitive. It is believed to have been discovered by Robert Plot during the 1800�s (Benton 128). The Tyrannosaurus lived during t ...
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