The Koala
.... baby marsupial.
The mother gives "pap˛ to the joey, a liquid from the caecum (which is similar
to the human organ, appendix.) This is thought to give the joey the ability to
eat only eucalyptus leaves. When the joey emerges from the pouch, it clings to
its mother for another seven months. The joey stays with its mother for another
three or four years, until it is fully grown.
Diet
Koalas eat eucalyptus and don't drink water. I guess that's how they
got their name. In the aboriginal language, "koala" means "no drink water."
But, the koala does drink water, only when it is ill. Out of the 350 species of
eucalyptus, the koala .....
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The Dust-Cloud Hypothesis
.... that remained behind then collected together because of
gravity. Although the shrinking earth generated a lot of heat, most of
this heat was lost into space. Therefore, the original earth was most
likely solid, not molten.
This hypothesis was developed by a scientest, Harold C. Urey in 1952. It is
also known as the Urey's hypothesis. He showed that methane, ammonia, and
water are the stable forms of carbon, nitrogen, and oxygen if an excess of
hydrogen is present. Cosmic dust clouds, from which the earth formed,
contained a great excess of hydrogen.
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Holograms
.... the orange or even the back of the apple. If that
seems a bit obvious, just try looking behind something in a regular
photograph! You can't, because the photograph can't reproduce the
infinitely complicated waves of light reflected by objects; the lens of a
camera can only focus those waves into a flat, 2-D image. But a hologram
can capture a 3-D image so lifelike that you can look around the image of
the apple to an orange in the background -and it's all thanks to the
special kind of light waves produced by a laser.
"Normal" white light from the sun or a lightbulb is a combination of
every colour of light in the spectrum -a .....
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Mitochondrion
.... with new phosphates.
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Hurricanes
.... surface, it soaks up more and more
water vapour. At the storm center, this new supply of water vapor gets
pulled into the thunderhead updrafts, releasing still more energy as the
water vapor condenses. This makes the updrafts rise faster, pulling in
even larger amounts of air and water vapor from the storm's edges. And as
the updrafts speed up, air swirls faster and faster around the storm center.
The storm clouds, moving with the swirling air, form a coil.
In a few days the hurricane will have grown greatly in size and power.
The swirling shape of the winds of the hurricane is shaped like a dough-nut.
At the center of this .....
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The Great Imposters
.... imitating
ladybugs. There are even animals that look like themselves, which can also
be a form of impersonation. The phenomenon of mimicry, as it's called
by biologists, was first noted in the mid-1800s by an English naturalist,
Henry W. Bates. Watching butterflies in the forests of Brazil, Bates
discovered that many members of the Peridae butterfly family did not look
anything like their closest relatives. Instead they bore a striking
resemblance to members of the Heliconiidae butterfly family.
Upon closer inspection, Bates found that there was a major advantage
in mimicking the Heliconiids. Fragile, slow-moving and .....
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Skylab
.... workshop
habitable. At the same time, engineers "rolled" Skylab to lower the temperature
of the workshop.
Skylab's 2nd manned mission - May 25th to June 22nd
Astronauts;
Charles Conrad, Jr.
Paul J. Weitz
Joseph P. Kerwin
The crew meats with Skylab on the fifth orbit. After making many repairs,
including deployment of parasol sunshade which cooled the inside temperatures to
75 degrees F, by June 4 the workshop was in full operation. In orbit the crew
conducted solar Earth resources experiments, medical studies, and five student
experiments; 404 orbits and 392 experiment hours were completed; three EV .....
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The Process Of Mitosis
.... 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, this is also made out of microtubules.
[A labelled diagram of the end of the Prophase stage of a cell here would be
great.]
Metaphase --------------------------------------- During this stage the
chromosomes move towards the equator of the spindle, attaching themselves
horizontally by the centromere to the spindle's filament .....
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Current Status Of Malaria Vaccinology
.... 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 uninucleated cells called trophozites The nucleus of this
newly formed cell then divides asexually to produce a schizont, which has
6-24 nuclei. Now the multinucleated schizont then divides to produce
mononucleated merozoites . Eventually the erythrocytes reaches lysis and
as result the merozoites enter the bloodstream and infect .....
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Soil Salinity
.... 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 represents more than half the
total irrigation area. In Western Australia, about 250 square kilometres of
agricultural land is going out of production every year because of soil salinity
caused by overclearing of native vegetation.
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Microwaves
.... 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 seem like a fairly new one, but in
fact it reaches back thousands of years. Ever since mastering fire, man
has cooked with infrared radiation, a close kin of the microwave.
Infrared rays are what give you that warm glow when you put your
hand near a room radiator or a hotplate or a campfire. Infrared rays,
flowing from .....
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Nuclear Power
.... 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 stages. The first step is 'Feeding'. In this
step the vitrification receives a constant flow of mixture of wastes and
of additives until it is 80% full of calcine. The feeding rate and heating
power are adjusted so that an aqueous phase of several litres is
permanently maintained at the surface of the pot. The second step is the
'C .....
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