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» Browse Science and Environment Term Papers
Egyptians
Number of Words: 1583 / Number of Pages: 6
... us to visit, the answer, "our earth is the only planet with human beings,"
still seems to be legitimate and convincing. But that is a very narrow-minded
way to look at things. The idea that life can flourish only under terrestrial
conditions has been made obsolete by research. It is a mistake to believe
that life cannot exist without water and oxygen. Even on our own earth there
are forms of life that need no oxygen. They are called anaerobic bacteria.
A given amount of oxygen acts like poison on them. Why should there not be
higher forms of life that do not need oxygen?par We are still conv ...
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The Overpopulation Of The Snow Goose In North America
Number of Words: 1801 / Number of Pages: 7
... 1950’s. Researchers have done a lot of study on the numbers and the degradation but may need to do more studies on the impact to other species and look for other options to control the populations.
Population Trends
The numbers of all "light" colored geese has been on the rise since data was first collected. The Lesser Snow Goose (LSGO) has drastically increased in number since data was first taken. Numbers range from around 800,000 in 1969 to as many as 6 million in 1996 (CWS 1999). While the Greater Snow Goose (GSGO) has risen in numbers from a few thousand to almost 500,000 (CWS 1999). This ...
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Canabis
Number of Words: 617 / Number of Pages: 3
... struck directly at tens of millions of Americans of all ages, including many of societies most powerful members. Marijuana prohibition threatened far fewer Americans, and they had relatively little influence in the districts of power. Only the prohibition of marijuana, which some sixty million Americans have violated since 1965 has come close to approximating the prohibition experience, but marijuana smokers consist mostly of young and relatively powerless Americans (American Heritage, pg 47). Alcohol prohibition was repealed and marijuana prohibition was retained, not because scientists had pr ...
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Mercury 2
Number of Words: 532 / Number of Pages: 2
... to the Sun reaches 427 degrees Celsius, a temperature hot enough to melt tin. On the side facing away from the Sun, or the night side, the temperature drops to -183 degrees Celsius. Scientists have detected a magnetic field surrounding Mercury, though it is not as strong as the field around the Earth. Scientists theorize that Mercury's field is due to an iron-bearing core or possibly to the solar winds. Mercury's atmosphere is very thin and is composed of helium and sodium. The surface of Mercury has been shaped by three processes: impact cratering where large objects struck the surface resultin ...
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Electronics- Logic Probe
Number of Words: 428 / Number of Pages: 2
... in attaching the clips to safe voltages; you may want to first use a Volt Meter (Digital Multi Meter) to verify the hook up points have good voltages. The four diodes protect the IC from reverse polarity. Capacitor C1 prevents transient voltage from affecting the logic probe when the black lead is not connected. Pin 5 of the 555 IC is grounded through resistor R1. The logic probe will indicate a HIGH for 2V or greater, and a LOW for 0.8V or less.
To use this logic probe, follow the procedure.
1. Connect red power lead to +5V of circuit under test.
2. Connect black lead to ground of circuit under te ...
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Mercury
Number of Words: 384 / Number of Pages: 2
... Mercury is used in thermometers because the change in volume for
each degree of rise or fall in temperature is the same. The use of mercury in
the thermometer instead of alcohol was done by Gabriel Daniel Fahrenheit in 1714.
It was also used in vacuum pumps, barometers, and electric rectifiers and
switches. Mercury is used in a mercury-vapor lamps which are used as a source
of ultraviolet rays in homes and for sterilizing water. Mercury-vapor is also
used instead of steam in the boilers of some turbine engines. Mercury is
sometimes used for amalgamation. Amalgamation is a metallurgical ...
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The Theory Of Evolution
Number of Words: 5626 / Number of Pages: 21
... process was the beginning of life.
But, there are minimal chances that this organic soup would form. Consider the experiment of Stanley Miller. In 1953, Stanley Miller passed an electric spark through an atmosphere of hydrogen, methane, ammonia, and water vapor; an atmosphere similar to the so-called "primitive atmosphere." But, this produced only 4 out of the 20 amino acids essential to form life. Interestingly, though, Miller saved the four amino acids only by removing them from the area in which the spark was generated. The book Life - How did it get here explained that "the same energy that would ...
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Black Holes
Number of Words: 1047 / Number of Pages: 4
... to break away from a graviational pull is called the "escape velocity". Roughly, earth’s escape velocity is about 25,000 M.P.H. (11.2 kilometers/second). Earth’s mass is nothing compared to the mass of a star that has the potential to become a black hole. A black hole has so much mass in such a small area, that its escape velocity is greater than the speed of light. So if were all living on earth, and earth was a black hole, we would need to go at the speed of light in order to get to the moon (and not to mention a lot of milk so our bones could support 800 million ton human beings).
Even though a blac ...
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Chloroflourocarbons
Number of Words: 1178 / Number of Pages: 5
... insecticides were bulky and hard to use, so CFCs
were created because they could be kept in liquid form and in an only slightly
pressurized can. Thus, in 1947, the spray can was born, selling millions of
cans each year. Insecticides were only the first application for CFC spray cans.
They soon employed a number of products from deodorant to hair spray. In 1954,
188 million cans were sold in the U.S. alone, and four years later, the number
jumped to 500 million. CFC filled cans were so popular that, by 1968, 2.3
billion spray cans were sold in America.
The hopes of a seemingly perfect ...
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Green Fluorescent Protein Purification
Number of Words: 1280 / Number of Pages: 5
... the N- or C-terminus without a distortion of its compact beta-can structure. Biochemists now frequently exploit GFP’s unique structural and physical characteristics to visualize various cellular activities.
One such application of GFP is to understand the role of a hormone, T3, in the translocation of thyroid hormone nuclear receptors (TRs).* In this project, GFP was fused to the human TR subtype b1 protein and the protein’s intracellular movement was visually tracked in live cells in the presence or absence of the T3 hormone. The prevalent hypothesis of this experiment was that T3 is essentia ...
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