|
|
|
» Browse Science and Environment Term Papers
Dsl
Number of Words: 954 / Number of Pages: 4
... the data you are sending, the wider the bandwidth you need for quality and speedy transmission. Still others deliver higher capacity for downloading than for uploading data. There is a whole portfolio of technologies coming on stream to match user needs at home and at work. The new millennium is about to put a completely new dimension into those telephone lines we have all come to take for granted.
Already there are towns and cities around the globe which really are wired for speed with DSL. There are even whole countries which are DSL-ed - like Singapore where ADSL on the phone lines have been ...
|
|
Bacteria 2
Number of Words: 608 / Number of Pages: 3
... to carry on cellular respiration. Some bacteria, called facultatibe anaerobes can live in either the presence or absence of free oxygen. They obtain energy either by aerobic respiration when oxygen is present or by fermentation when oxygen is absent. Still other bacteria cannot live in the presence of oxygen. These are called obligate anaerobes. Such bacteria obtain energy only fermentation. Through fermentation, different groups of bacteria produce a wide variety of organic compounds. Besides ethyl alcohol and lactic acid, bacterial fermentation can produce acetic acid, acetone, butyl alcohol, glycol, ...
|
|
Multi-regional Continuity: The Fossil Evidence
Number of Words: 1080 / Number of Pages: 4
... “Archaic” features in skull morphology include thick cranial walls, heavy supraorbital ridges, large teeth, large eye sockets, sloping foreheads, low cranial volume (below 1200 cc.), high prognathism in the area of the lower face, and a small, football-shaped cranium. The presence of various mixtures of these modern and archaic traits forms the basis for identifying a fossil as transitional modern/archaic in accordance with the multi-regional continuity model of human evolution.
As an example of transitional fossils found outside of Africa and in accordance with the multi-regional m ...
|
|
Nervous System
Number of Words: 514 / Number of Pages: 2
... * Synapse terminals communicate information from the
presynaptic cell to the posisynaptic cell.
Structural Classification
*Anaxonic neurons- have multiple processes and the axon is
indistinguishable from the
from the dendrites. They're fairly small.
*Bipolar neurons- have two processes in which one is a
dendrite, and the other an axon.
The dendrite is distinguishable from it's extensive
branching at it's distal end. it's less than 3Omm from tip
to tip.
*Unipolar neurons- have a continuous dendritic and axonal
process, in which case the cell body lies off to the side.
The dendr ...
|
|
Penguins: The Eyes Have It!
Number of Words: 1047 / Number of Pages: 4
... Islands,
a Canadian researcher discovered that penguins are able to recognize
individuals and navigate the rocky terrain on which they live quite well.
Long of body and short of leg, they probably poke their heads forward as
an aid to balance. And as for looking at the ground, they're merely-like
us-keeping an eye on where they're going.
The human eye is adapted for aerial vision, which is why scuba divers-or
even you and I in the local swimming pool-must wear goggles or a face mask
to re-introduce air in front of our eyes in order to see clearly.
Among vertebrates in general, the bird eye is freque ...
|
|
Caffeine 2
Number of Words: 413 / Number of Pages: 2
... than being broken down. Second among the effects of caffeine is phosphodiesterase inhibition. The phosphodiesterase class of enzymes includes a number of enzymes responsible for breaking down cyclic AMP, thus depriving the body of an energy supply. Caffeine fools phosphodiesterase into attacking it instead, which inhibits the breakdown of cyclic AMP. However, the concentration of caffeine required for this effect to become significant is sufficiently high that the adenosine blocking remains the dominant factor. The other two laboratory effects of caffeine have been judged insignificant in actual bi ...
|
|
Saturn
Number of Words: 568 / Number of Pages: 3
... hundred mile per second. also has a jet stream. 's magnetosphere consuts of a set of doughnut-shaped radiation belts in which electrons and atomic nuclei are trapped. The belts extend more than two million kilometers from the center of and even farther in the direction away from the sun, although the size of the magnetosphere fluctuates, depending on the intensity of the solar wind. like Jupiter has many storm systems on the planet. From Earth appears to be a yellowish object One of the brightest in the night sky. Observed from a telescope you can see two of 's seven ring bands. Three U.S. spacec ...
|
|
How Technology Effects Modern America
Number of Words: 1229 / Number of Pages: 5
... the demand for their services,” says L.
Mishel, Research Director of Welfare Reform Network.
In view of these facts, I wonder if these trends are good or bad for
society. “The danger of the information age is that while in the short run
it may be cheaper to replace workers with technology, in the long run it
is potentially self-destructive because there will not be enough
purchasing power to grow the economy,” M. B. Zuckerman. My feeling is
that the trend from unskilled labor to highly technical, skilled labor is
a good one! But, political action must be taken to ensure that this
societal evolut ...
|
|
Arsenic
Number of Words: 1241 / Number of Pages: 5
... it. Since then the method has scarcely changed: the mineral arsenopyrite is heated and decomposes with the liberation of gas. The gas can be condensed on a cold surface. Metallic was first produced in the 17th century by heating with potash and soap.
General Properties
is very similar to antimony and bismuth. It exists in bright, metallic forms that are stable in air. It is found free in nature or in combination with other elements, usually sulfur. It is most often used to improve the strength and hardness of alloys, which are combinations of metals. is a gray, shiny metalloid, which is a ...
|
|
The History Of White-Tailed Deer In Kentucky
Number of Words: 606 / Number of Pages: 3
... September and nurse until mid
October. About 40 percent of female fawns breed during their first autumn, but
usually bear only one fawn. Does breeding at age 1 1/2 or older generally have
twins, and sometimes triplets. By November, Kentucky's deer population typical
increases slightly more than one fawn per doe. Although many more fawns are
born than one per doe, some will die before the hunting season arrives.
A deer's home range averages about 500 acres. In mountains, the home
range may exceed 1,000 acres. Even though this size area can support about 40
deer, these animals will not always stay ...
|
|
|
