Big Bang Theory
.... the perfect cosmological
principle. This principle says that the universe is the same everywhere
on the large scale, at all times.2 It maintains the same average density
of matter forever.
There are observational evidences found that can prove the Big Bang
model is more reasonable than the Steady State model. First, the
redshifts of distant galaxies. Redshift is a Doppler effect which states
that if a galaxy is moving away, the spectral line of that galaxy observed
will have a shift to the red end. The faster the galaxy moves, the more
shift it has. If the galaxy is moving closer, the spectral line will show
a blue shift. .....
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Into The Depths Of A Black Hole
.... a nuclear reaction occurs and the gases within
the star start to burn continuously. The Hydrogen gas is usually the first
type of gas consumed in a star and then other gas elements such as Carbon,
Oxygen, and Helium are consumed.
This chain reaction fuels the star for millions or billions of years
depending upon the amount of gases there are.
The star manages to avoid collapsing at this point because of the
equilibrium achieved by itself. The gravitational pull from the core of
the star is equal to the gravitational pull of the gases forming a type of
orbit, however when this equality is broken the star can go into se .....
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Astronomy And Space Science: Your Bones In Space
.... a storage area for calcium which is vital for human metabolism,
houses the bone marrow within its mid cavity and to top it all it is
capable of changing its architecture and mass in response to outside and
inner stress. It is this dynamic remodeling of bone which is of primary
interest in microgravity. To feel the impact of this dynamicity it should
be noted that a bone remodeling unit [a coupled phenomena of bone
reabsorption and bone formation]is initiated and another finished about
every ten seconds in a healthy adult. This dynamic system responds to
mechanical stress or lack of it by increasing the bone mass/density or
decreas .....
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The Human Brain
.... provides
maximum protection with minimum weight, the ideal combination. The other
twenty bones make up the face, jaw and other parts of the skull.
Another way the brain keeps it self safe is by keeping itself in
liquid. Nearly one fifth of the blood pumped by the heart is sent to the
brain. The brain then sends the blood through an intricate network of
blood vessels to where the blood is needed. Specialized blood vessels
called choroid plexuses produce a protective cerebrospinal fluid. This
fluid is what the brain literally floats in.
A third protective measure taken by the brain is called the blood
brain barrier. This .....
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Chromosome Probes At The University Of Toronto
.... take advantage of
the technology.
Current prenatal testing involves growing fetal cells in vitro and
examining them, over one or two months, to see if there are two copies of
a particular chromosome, which is normal, or one or three, which is
abnormal. A test using Willard's probes would require only a few cells and
a few days to detect abnormalities. "I don't think it's beyond the realm
of possibility that these kinds of tests could eventually be done by an
obstetrician in the office during the early stages of pregnancy," he adds.
The determination of gender is another possible use for the probes. Many
diseases, such as Dusche .....
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David Levinson: Seasons' Of A Man's Life
.... of themselves) is the
major component in Levinson's theory. The life structure for each person
evolves through the developmental stages as people's age.
Two key concepts in Levinson's model are the stable period and the
transitional period in a person's development. The stable period is the time
when a person makes crucial choices in life, builds a life structure around the
choices and seeks goals within the structure. The transitional period is the
end of a person's stage and the beginning of a new stage.
Levinson's model contains five main stages. They are the pre-adulthood
stage (age 0 - 22), the early adulth .....
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Classification
.... plants from all over the world, and he would devise a way
to relate them. At the age of thirty-two he was the author of fourteen
botanical works. His two most famous were Genera Plantarum, developing an
artificial sexual system, and Species Plantarum, a famous work where he
named and classified every plant known to him, and for the first time gave
each plant a binomial. This binomial system was a vast improvement over
some of the old descriptive names for plants used formerly. Before Linnaeus,
Catnip was known as: "Nepeta floribus interrupte spicatis pedunculatis"
which is a brief description of the plant. Linnaeus named it Nepeta .....
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The Grasslands
.... only about twenty to
thirty inches of rain each year, with most of it coming in the same season.
Some grasslands may even receive up to thirty to forty inches of rain a year!
For example, since the grasslands of the United States have hot summers and mild
winters, most of the rain comes from the summer thunderstorms. With this
limited amount of rain, only grasses and shrubs can grow. But some grassland
areas have enough rain to support some trees such as cottonwood.
With this kind of climate and vegetation, it is no wonder that they have
low human population densities. Because there are not that many people living
in this kind .....
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Concept Of Species
.... in these groups. It is not
coincidental that the BSC is less widely used amongst botanists.
Terrestrial plants exhibit much more greater diversity in their mode of
reproduction than vertebrates and insects.
There has been many criticisms of the BSC in its theoretical validity and
practical utility. For example, the application of the BSC to a number of
groups is problematic because of interspecific hybridisation between
clearly delimited species.(Skelton).
It cant be applied to species that reproduce asexually ( e.g Bdelloid
rotifers,eugelenoid flagellates ).Asexual forms of normally sexual
organisms are also known. Prokaryote .....
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Evolution
.... ............................................... 48
INTRODUCTION
Theories explaining biological evolution have been bandied about since
the ancient Greeks, but it was not until the Enlightment of the 18th
century that widespread acceptance and development of this theory emerged.
In the mid 19th century english naturalist Charles Darwin - who has been
called the "father of evolution" - conceived of the most comprehensive
findings about organic evolution ever1. Today many of his principles still
entail modern interpretation of evolution.
I've assessed and interpreted the basis of .....
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The Human Eye In Space
.... I also saw the wake of a boat on a large river
in the Burma-India area... and a bright orange light from the British oil
refinery to the south of the city (Perth,Australia.)"
The above observation was made by Gordon Cooper in Faith 7 [1963] and
which generated much skepticism in the light of the thesis by Muckler and
Narvan "Visual Surveillance and Reconnaissance from space vehicles" in
which they determined that a visual angle of ten minutes was the
operational minimum, and that the minimum resolvable object length
[M.R.O.L] at an altitude of 113 miles would be 1730 ft. This limitation of
acuity was revised the next year to .....
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Ocean Pollution In The Third World
.... has a lot of answers and solutions for it like what
can people in the First World do to help the Third World people out. The books
and my resources found many ways to finish off this problem. I also found some
insight to this problem. The resource which helped me a lot was the internet
because it had the most up to date news or studies about this problem even newer
than stuff in any kind of book.. From all the research, I think this problem
can be finished off before our grandchildren are born.
.....
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