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» Browse Science and Environment Term Papers
Endangered Species Of South
Number of Words: 1449 / Number of Pages: 6
... through evolution, or natural selection. The current global extinction rate is estimated at about 20,000 species per year, exponentially greater than the background extinction rate (17). Many biologists believe that we are in the middle of the greatest mass extinction episode since the disappearance of the dinosaurs 65 million years ago (18).
The survival of ecosystems (plant and animal communities and their physical surroundings) such as forests, coral reefs, or wetlands depend on their biodiversity or variety of plants, animals, and habitats, as well as the many interactions among these species. T ...
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Hard Drive Evolution
Number of Words: 988 / Number of Pages: 4
... into a device the size of a small shoebox. At the time, a storage capacity of 10 MB was considered too large for a so-called "personal" computer.
The first PCs used removable floppy disks as storage devices almost exclusively. The term "floppy" accurately fit the earliest 8-inch PC diskettes and the 5.25-inch diskettes that succeeded them. The inner disk that holds the data usually is made of Mylar and coated with a magnetic oxide, and the outer, plastic cover, bends easily. The inner disk of today’s smaller, 3.5-inch floppies is similarly constructed, but they are housed in a rigid plasti ...
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Effects Of Asperguillus
Number of Words: 292 / Number of Pages: 2
... from construction and renovation. Additional sources of the fungal spores
could be contaminated or wet wood, bird droppings in air ducts, or decaying
fireproofing materials. The fungus causes pneumonia in a host with a weak or
otherwise compromised immune system. Patients at risk are those undergoing
organ transplant or bone marrow transplants, and depending on the type of
transplant, mortality rates are as high as 95%. Bone marrow transplant patients,
the highest risk group, should be treated like they are immunosuppressed for up
to four weeks after the procedure. The portal of entry is ...
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Alcohol 2
Number of Words: 390 / Number of Pages: 2
... diet were believed beneficial to health.
During the 1800’s, a movement began in the United States to prohibit the manufacture and sale of alcoholic beverages. A constitutional amendment banning the beverages went into effect in 1920, but thousands of Americans defied the prohibition law. In 1930, the federal government estimated that about 800 million gallons of alcoholic beverages were being produced in the country annually. The prohibition amendment was repealed in 1933.
When alcohol is taken into the stomach and intestines, it is absorbed and distributed rapidly throughout the entire body fluids a ...
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The Platypus
Number of Words: 961 / Number of Pages: 4
... are used for rearing young, and the other dwelling burrow is used by both sexes as a place to rest, sleep and eat. Burrows have a problem with maintaining a flow of air through them. If a platypus stays in a burrow for too long it will begin to use up its supply of oxygen. The nesting burrow has an entrance above water level to increase oxygen supply, whereas the dwelling burrows are located below water level.
has a bill like a duck, and a tail like a beaver. Some believe it is a cross between a duck, beaver, and fish. lays eggs and suckles its young. Roughly half the size of a household c ...
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Artificial Insemination
Number of Words: 636 / Number of Pages: 3
... as AIDS, gonorrhea and other STDS. Even though freezing sperm doesn't seem to affect a pregnancy, it reduces the sperm's movement and influences the success rate of . About 75 to 85 percent of women inseminated with fresh donor semen will get pregnant--especially if the procedure is repeated over several months. Unfortunately, freezing the sperm decreases the chances of success by 10 to 15 percent.
Today's reproductive technology is not limited to helping create human families. Reproductive specialists at the nation's zoos and research centers have begun to investigate ways to save endangered animals ...
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Changing World
Number of Words: 1035 / Number of Pages: 4
... what is left of the planet's forests and, an estimated 37 percent of the fish species that inhabit thelakes and streams of North America are either in jeopardy or extinct. A second indicator that displays humanity's misuse of technoscience is the global economy. Global economic statistics show the results of the applications of technoscience. In 1995, the global economy grew by an estimated 3.7 percent the largest gain since the 4.6 percent growth in 1980 (Brown, 74). The use of technoscientific developments in various fields raised the global output of goods and services. Although this was an ...
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Aquarius
Number of Words: 416 / Number of Pages: 2
... why the star got this name
Situla: This name comes from Latin and means "well bucket". Situla was
the original Arabic name for the entire constellation Aquarius.
There are three star clusters contained in Aquarius. M2, which was
discovered in 1764, is one that can be seen with a small telescope. A larger
telescope is needed to make out the individual stars. M72 is another cluster
that is located southeast of Albali and isn't far from the Saturn Nebula. NGC
7492 is the third cluster and is located east of Skat.
Aquarius also has two nebulae in it. It is called the Saturn Nebula
because it r ...
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Gold
Number of Words: 914 / Number of Pages: 4
... the time of the early cultures from which modern civilization
is descended the search for gold was wide spread"(Green 1968).
Gold is mainly extracted through mining. It is mainly found in
tiny flakes or sands but sometimes is found in nuggets. The largest nugget
ever found weighed eight kilograms. "Gold deposits are usually classified
as lode, placer, massive or disseminated types" (Colliers Encyclopedia).
"Lode deposits are mostly associated with acidic ingenous intrusives in
rocks of the Precambrian to late Tertiary periods"(Green 1968). Metallic
gold is mostly found in lode deposits. The w ...
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Linux 2
Number of Words: 6064 / Number of Pages: 23
... system called MULTICS. Both UNIX and MULTICS were developed decades ago for very large computers; only now, decades later are personal computers finally powerful enough to tackle these multitasking, multi-user systems with advanced features. Getting back to the crux of our first fact, LINUX looks like UNIX. LINUX is not officially UNIX simply because it was not written by the same programmers as was the original UNIX system. However, LINUX runs UNIX programs and shares the UNIX command set. LINUX is, for all general intents and purposes, a full-featured UNIX-type operating system.
W ...
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