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» Browse Science and Environment Term Papers
Human Cloning
Number of Words: 910 / Number of Pages: 4
... sounds simple enough it has never fully worked because of abnormalities that occur like if the embryo is developed by two sperm cells the chromosome count is wrong. Another is as the cells duplicate they usually do not make it passed the 32-cell stage or 64 because of abnormalities in the environment or just because the process is not natural. The real reason why it does not work yet is not clearly known at the moment.
Since became such a distinct possibility with Dolly being born many ethical and moral issues have been brought up. First off cloning takes out the entire autonomy of childbirth. ...
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Mercury
Number of Words: 391 / Number of Pages: 2
... in medicine. fulminate Hg(ONC)2 used as a detonator in explosives and mercuric sulfide HgS used as a high-grade paint pigment. Organic compounds are important and dangerous. Methyl is a lethal pollutant found in rivers and lakes. is a virulent poison and is readily absorbed through the respiratory tract, the gastrointestinal tract, or through unbroken skin. It acts as a cumulative poison since there are few pathways available to the body for its excretion. Since is a very readily vaporizable element at a relatively low temperature, dangerous levels are readily attained in air. Air saturate ...
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The Leaf-Cutting Ants
Number of Words: 3880 / Number of Pages: 15
... Atta texana , occurs in Texas and Louisiana. This ant is believed to cause a total yearly loss of $5 million in the United States (unison services. 1998).
There are about 9,500 named species of ants. These ants are divided into 16 sub families and 300 genera, all which belong to the family called Formicidae, the family of ants (Hoyt. 1996). The leaf cutting ant belongs to the genus called Atta. There are fifteen different species of Atta and all are limited to the new world (Holldobler & Wilson, 1994).
The leaf-cutter ant looks pretty much like a regular ant in North America except that it is a littl ...
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Geography Examine The Reasons For Inner City Initiatives And
Number of Words: 782 / Number of Pages: 3
... social fabric, and
- to improve environmental quality.
The Government also set up programmes which would help these aims to be met, such as the Urban Development Corporations (e.g. LDDC London Docklands Development Corporation) and the availability of grants for urban development.
The inner cities had many problems all of which linked together to form a less affluent area which was very hard to improve as to help with one problem often meant having to solve another one too.
Housing in inner city areas was poor quality and in a 1991 census it was found that over 1 million homes in the inner ci ...
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Faster Dissolved Oxygen Test Kit
Number of Words: 3502 / Number of Pages: 13
... in dissolved
oxygen levels in water in the last 15 years. It may be that we are only keeping
up with the amount of pollution we are producing. (Knopman, 1993)
The early biosphere was not pleasant for life because the atmosphere had
low levels of oxygen. Photosynthetic bacteria consumed carbon dioxide and
produced simple sugars and oxygen which created the oxygen abundant atmosphere
in which more advanced life forms could develop. (Brown, 1994) The mystery of
how Earth's oxygen levels rose is very complex. Scientists don't agree when or
how the oxygen on earth got here, but we know we could not ...
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Life Sciences SIG: Gut Issues - Essay About Dietary Fibers
Number of Words: 534 / Number of Pages: 2
... digestive system and then
course through the blood stream fueling muscles and nerves. Rather, when
eaten they tumble intact through the stomach and small intestine and end up
in the colon where billions of bacterial feed on them - in turn producing
intestinal gas. No wonder, then, that dietary fibre has been unwelcome in
many of history's nicer neighborhoods.
Even 20th century doctors reasoned that since the bulky material
provided not a single nutrient, it would only strain already troubled guts.
Accordingly, they recommended low-fibre diets for patients suffering from
hemorrhoids and other colo ...
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Internet History Report
Number of Words: 946 / Number of Pages: 4
... to a 1973 research program that culminated in a demonstration system in 1977. It demonstrated networking through various mediums, including satellite, radio, telephone, ethernet, etc. using packet switching. And this formed the roots of the Transmission Control Protocol and Internet Protocol (TCP/IP). But it was not until 1983 that all nodes on ARPANET were required to use TCP/IP to connect to it.
Also in 1983, the Department of Defense moved the unclassified portions of the Data Defense Network to create MILLET. Then in January 1983, the ARPA Internet first appears and operation was passed to the Def ...
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Cladocerans
Number of Words: 1562 / Number of Pages: 6
... Take a small culture dish to the instructor to receive a few living D. magna. This is a very large species, as go, and one that is easily cultured in the laboratory. Return to your bench and observe the animals using the dissecting microscope. Note the characteristic jerky swimming motion. The uneven appearance of this motion is a result of there being only one pair of locomotory appendages, or oars. Try to observe the movement of the second antennae, which are the locomotory appendages. If you have watched adult brine shrimp, Artemia, in motion, the difference should be immediately apparent. Adult ...
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Photoperiodism
Number of Words: 260 / Number of Pages: 1
... of plants. The ability to respond to day length is linked to an
inner, light-sensitive circadian rhythm.
In the temperate zones, day lengths during the natural 24-hour cycle
vary with the seasons. In winter and spring, the period of light
lengthens; in summer and autumn, it shortens. Plants in these zones
undergo alternate 12-hour phases of light sensitivity. During one 12-hour
phase, decreasing exposure to light induces a short-day reaction. For
example, deciduous trees under the influence of the shorter days of fall
drop their leaves. During the other 12-hour phase, more exposure to light
creat ...
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Achondroplasia
Number of Words: 997 / Number of Pages: 4
... Sometimes the person has limited twisting ability at the elbows. The hands are short, and the feet are short and flat. Another sign is double jointedness, caused by loose ligaments in some joints. Achondroplastic children can flex their finger, wrist, hip, and knee joints to an extreme degree because of this. These signs are usually apparent at birth, and can be diagnosed at that time. Affected men average 51.8 inches in height, while women average 48.6 inches. There is no relationship between the height of the parents and the adult height of their children with .
Children with develop s ...
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