The Process Of Mitosis
.... 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 opposite poles of the cell and small microtubules around the
centrioles become visible (called "Asters"). The nuclear membranes and nucleolus
disintegrate after passing their nucleic acids to certain pairs of chromatids.
Now a spindle forms, .....
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Current Status Of Malaria Vaccinology
.... the
bloodstream via the bite of an infected female mosquito. During her
feeding she transmits a small amount of anticoagulant and haploid
sporozoites along with saliva. The sporozoites head directly for the
hepatic cells of the liver where they multiply by asexual fission to
produce merozoites. These merozoites can now travel one of two paths. They
can go to infect more hepatic liver cells or they can attach to and
penetrate erytherocytes. When inside the erythrocytes the plasmodium
enlarges into unin .....
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Soil Salinity
.... tolerate the scalding chemical effect of the salt, and so they die. As
they die off, the soil succumbs to erosion and a double dose of salt and
sediment enters nearby rivers and wetlands. In cattle-grazing areas, the animals
often gather at saline seeps to lick the salt, which leads to further erosion.
Salinity affects around 560,000 hectares of the Murray-Darling basin's most
productive irrigation lands, mostly in southern New South Wales, and northern
Victoria, and partly in South Australia. This .....
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Microwaves
.... many times smaller. This enabled
them to make more effective use of radar since an antenna could be carried
on aircraft, ships and mobile ground stations.
This characteristic of microwaves, the efficiency with which they are
concentrated in a narrow beam, is one reason why they can be used in
cooking. You can produce a high-powered microwave beam in a small oven,
but you can't do the same with radio waves, which are simply too long.
Microwaves and their Use
The idea of cooking with radiation may .....
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Nuclear Power
.... of storing radioactive wastes is by a process
called 'vitrification'.
Vitrification is a semi-continuous process that enables the
following operations to be carried out with the same equipment:
evaporation of the waste solution mixed with the additives necesary for
the production of borosilicate glass, calcination and elaboration of the
glass. These operations are carried out in a metallic pot that is heated
in an induction urnace. The vitrification of one load of wastes
comprises of the following stage .....
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Introduction To Evolution
.... hereditary traits,
that are passed from parent to offspring. By chance, some varieties prove to be
ill adapted to their current environment and thus disappear, whereas others
prove to be adaptive, and their numbers increase. The elimination of the unfit,
or the "survival of the fittest," is known as Natural Selection because it is
nature that discards or favors a particular being. Evolution takes place only
when natural selection operates on apopulation of organisms containing diverse
inheritable forms.
.....
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Tim O'Brien's The Things They Carried Eating Them Away
.... the field where he feels he lost everything. On
this list he includes his honor, his best friend, and all faith in himself.
For O'Brien, evidence of the parasite is not solely in his return Vietnam,
but rather a constant personal preoccupation that seems to flow through
the collection of stories. O'Brien shows how the memories of the war take
on a parasitic form, and uses himself as an example.
In the chapter ³Speaking of Courage², O'Brien introduces a character by
the name of Norman Bowker. In the stor .....
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The History Of White-Tailed Deer In Kentucky
.... cared for and may remain with the mother until the
next spring. Fawns retain their spots until mid 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 .....
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Darwinism: The Theory That Shook The World
.... in Darwin's theories, he astounded
the scientific world as well as the public and was able to convince many in the
presence of a misguided past belief. This fact alone makes him one of the most
important people of science ever.
Charles Darwin was born in Shrewsbury-Shropshire, England on Feb 12,
1809 (GEA & RBi p 42). He was the fifth child in a wealthy English family with
a history of scientific achievement with his paternal grandfather Erasmus Darwin
who was a physician and a savant in the eighte .....
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Penguins: The Eyes Have It!
.... and generally out of place.
In fact the reverse is true. During a recent stay on the Falkland 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 dive .....
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Theory And Research
.... correlation study method used in the survey research of
"Horatio Alger lives" lack components of validity and reliability.
News Article Summary
This article entitled "Horatio Alger lives" is basically a survey
correlation study done on two distinct social classes; sons of wealthy fathers
and sons of lower income fathers. The goal in this research was to determine
which sons of the two distinct social groups mentioned, were to likely make more
money in the future. Therefore, they surveyed 400,000 male .....
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DNA: The Thread Of Life
.... and cytosine. In DNA adenine pairs with thymine and guanine with
cytosine.
Medicine's ability to diagnose continues to exceed its ability to treat
or cure. For example, Huntington's Chorea is an inherited disease that develops
between the ages of 30 and 45, can be diagnosed before any symptoms appear.
This can be hard for both the individuals with the disease and their family.
There is a 3 billion dollar project underway right now called the Human
Genome Project, a 15 year program to make .....
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Photoperiodism
.... the season and the time spans within a season. Florists can
often manipulate greenhouse plants into producing blossoms out of season
by exposing them to periods of artificial light.
Some scientists are not certain that the biological clock of any
organism is completely endogenous. They think that even under the most
constant of laboratory conditions living things are aware of the Earth's
rotation and that this has an effect on the wheelof their clocks. However,
many scientists believe tha .....
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Mechanical Energy
.... our muscles. When we do use our muscles
within us, we may not always be sure that heat is given off. Our bodies
do not burst into flames but the perspiration on our skin is a clue to
what is happening.
The movement of the windsurfer has a different explanation.
The windsurfer is propelled along by a sail which collects mechanical
energy from the winds that sweep along the water. This energy has been
produced by the sun which warms the earth's surface and sets the air above
in motion. The sun's heat c .....
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The Tiger
.... dampen their
activities ( Mammals Multimedia Encyclopedia 1990).
Tigers usually live and hunt alone. When they hunt they can leap 5 to 6
or jump as far as 10 meters. Tigers do not usually prey on people, but some do
become man eaters. If a Tiger becomes a man eater it is because of a wound,
weakness, or just because it is to old. The young accompany their mother on the
hunt when they are 5 to 6 months of age. Tigers begin to hunt alone when they
are just eleven months old. Before the young can hu .....
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