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» Science Essays and Papers
The Process Of Mitosis
<view this essay>.... from the
case because very much is actually happening. All cell organelles are being
produced in quantity and the chromosomes - DNA molecules are being copied
exactly. The two identical copies of DNA are called a "pair of chromatids" and
they are linked together by an item called a "chromomere". During this stage a
store of ATP is also built up.
[Best put a labelled diagram of a cell during Interphase here.]
Prophase --------------------------------------- In this second stage changes to
the cell become visible. The chromosomes condense, coiling up to about 5% of
their original length, now clearly visible when a stain is added. The centrioles
move to the op .....
Number of words: 511 | Number of pages: 2 |
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The Solar System
<view this essay>.... moon revolves around the earth once every 27.3 days. The Moons distance from the earth is 384,400 km (238,620miles). Its diameter is 3,476 km (2,160miles). As the moon orbits the earth we see different amounts of it due to the light from the sun. These are the different phases known to man full, new, crescent, half, gibbous, and new moon.
The earth rotates in its axis once a day. The earth is a sphere shaped object. Its diameter is 12,750 km (7,923miles). It takes 23 hours and 56 minutes to rotate once, which is approximately one day. The sun orbits the sun ever 365.25 days. The average surface temperature is 15 degrees. The distance from the sun is 150milli .....
Number of words: 428 | Number of pages: 2 |
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Black Holes
<view this essay>.... a Black Hole. For instance, the possibility of our sun becoming a black hole is highly unlikely, simply because it is too small. Only a very large star has the potential to become a black hole.
The definitions of black boles are somewhat sceptical. Generally, a black hole is an area of super-concentrated mass. So concentrated, that no object can escape its gravitational pull. In other words, once you get caught by it’s graviational pull, you aren’t getting out again. The velocity you need 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 .....
Number of words: 1047 | Number of pages: 4 |
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Cable Vs. V.90 Modems
<view this essay>.... of cable connection to 1.5 Mbps The cable modem access network operates at Layer 1 (physical) and Layer 2 (media access control/logical link control) of the Open System Interconnect (OSI) Reference Model. Thus, Layer 3 (network) protocols, such as IP traffic, can be seamlessly delivered over the cable modem platform to end-users.
. Since cable modem technology is very recent the conflict exists between different standards. The only specification that has been approved by ITU (in 1998) is DOCSIS (Data Over Cable Service Interface Specifications) which was developed by MCNS, CabeLabs, Arthur D. Little and consortium of North American MCOs. Later that year C .....
Number of words: 1217 | Number of pages: 5 |
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Dna Chips And The Pharmaceutical Industry
<view this essay>.... DNA chips are the newest tools being used in the study of genomics. DNA chips are changing the way researchers analyze the genetic make-up of cells, and will soon render traditional pharmaceutical research obsolete. This allows for whole new generations of drugs that will be made to combat diseases by effecting changes in a their specific genetic design.
PROBLEM STATEMENT
Currently the pharmaceutical industry is a very high risk industry in which fewer than one in ten promising drug products ever makes it through the testing phase and onto the shelves at the local pharmacy. The effect is that the production of a new drug is almost like a guessing game that m .....
Number of words: 1693 | Number of pages: 7 |
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A Study Of B.F. Skinner And Behaviorism
<view this essay>.... paper the topics of reinforcement, punishments, rewards, and other aspects of behavioral psychology will be discussed to give a better understanding of B.F. Skinner and his studies.
A Study of B.F. Skinner's Behaviorism
B.F. Skinner is an American psychologist who is best known for his research into the learning process and his idealist view of having a planned society. He was born in Susquehanna, Pennsylvania in 1904. He graduated from Hamilton College in 1926. After becoming interested in the works and studies of John B. Watson and Ivan P. Pavlov, he studied with animal learning and functions of the nervous system. He received his Ph.D. in behavioral psyc .....
Number of words: 2037 | Number of pages: 8 |
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Addition Of Vectors
<view this essay>.... the difference between using graphical, analytical and experimental method in getting the resultant. A force table, weight holders, a set of slotted masses (200g and 249g), ruler, protractor, spring scale and triple beam balance were used. Each group has its own assigned mass and forces as well as a force table. Weight hangers were attached to two strings tied to the center ring of the force table, where two slotted masses, one 200g and the other 249g were hung according to their specified directions. The center ring was anchored to the nail positioned at the platform’s center while the upper ring of the spring scale was attached to the free end of the thi .....
Number of words: 565 | Number of pages: 3 |
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Nuclear Energy: Uranium Fission
<view this essay>.... than the common practice of burning coal or
oil. For comparison, coal combustion produces about 20-30 MJ/kg of heat energy
while uranium, in a fast breeder reactor, produces more than 24,000,000 MJ/kg
(Energy 27). Those numbers alone are astounding.
Uranium is also abundant, thanks to recent discoveries of large reserves.
At present, uranium is only being mined and separated from ore. However, a
huge untapped source is our oceans. Sea water contains 3.3x10^(-9) (3.3 parts
per billion) of uranium, so the 1.4x10^18 tons of sea water contains 4.6x10^9
tons of uranium. All the world's electricity usage, 650GWe could therefore be
supplied by the .....
Number of words: 1142 | Number of pages: 5 |
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