Hammerhead Sharks
.... grows more than four feet long. This shark is commonly seen inshore.
3. Smooth hammerhead (Sphyrna zygaena)-Bronze with dusky fin tips, it can grow
to thirteen feet.
4. Great hammerhead (Sphyrna mokarran)-Attaining a length of a possible 18 feet,
this is the largest and most dangerous of all the hammerheads.
One of the most interesting things about the hammerheads is the unique
shape of their heads. Ever since scientists started to study the hammerhead
they have speculated about the use of the ha .....
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Nuclear Weapons
.... is the chain reaction that
makes nuclear weapons possible. In a fusion nuclear device such as a hydrogen
bomb, lightweight nuclei are forced to fuse at very high temperatures into
heavier nuclei, releasing energy and a neutron. In order to squeeze the two
nuclei together, an atomic fission bomb is usually used. A fusion reaction
releases about four times more energy per unit mass than a fission reaction.
The United States supervised the development of the atomic bomb under the code
name Manhattan Project .....
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Nuclear Strikes
.... been caught stealing the
materials needed to make a bomb. These terrorists have never been caught in the
United States but numerous times in Europe.(www.pbs.org) As a matter of fact,
the Russians say someone stole a bomb simulator, which will explode and make
mushroom cloud but has no nuclear component.(Wilkie) People know that despite
efforts to keep control on the old Soviet stockpile and waste, terrorists are
getting the plutonium and uranium needed to make nuclear weapons to kill masses
of people. Th .....
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Homo Aquaticus?
.... a lot after the
human/chimp evolution. With the exception of the olferactory bulb (scent), all
brain structures are larger in humans than in apes. The neocortex (part of the
cerebral cortex), for instance is over three times larger than in chimps, even
though chimps and humans are pretty close to equal in body weight.
Each side of the brain is diveded by the central sulces into independant
halves. Just before the central sulcus lies the post-central cortex, where the
opposite body half (right si .....
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Changes In The Atmosphere Causing Multicellularity
.... into a number off
distinct chromosomes, and complex organelles, among which are chloroplasts and
mitochondria. Scientists believe that eukaryotic organisms such as the protists
evolved from the prokaryotes. There are two main theories which describe how
this transition may have occurred. The first is the endosymbiotic theory, or
enosymbiosis, and the other is the autogenous theory, or autogenisis. These two
theories are not mutually exclusive, meaning one or the other could account for
differen .....
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Human Evolution And The Fossil Record
.... eats and replenishes it,
if it were to die, the ratio would change greatly after many years. It is the
difference between this ratio now and the time is died that allows a date for it
to be established. Potassium-argon dating, another dating method, is possible
due to volcanic ash and rocks found near many fossil sites. Rocks and ash
created in this manner contain potassium-40, but no argon. As time passes, the
potassium-40 decays into argon-40. In the laboratory, the sample is reheated,
and since ar .....
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Nicolaus Copernicus
.... his uncle in his bishopric palace. While he stayed
there he published his first book which was a translation of letters written by
the 7th century writer, Theophylactus of Simocatta. After that he wrote an
astronomical discourse that laid the foundation of his heliocentric theory; the
theory that the sun is the center of our solar system. However, it was 400 years
before it was published.
After leaving his uncle, he wrote a treatise on money, and began the
work for which he is most famous, On the Revoluti .....
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Ibuprofen
.... with the information that I was using. Although this was a crude
experiment, I believe that I did gain a lot from it.
Introduction
The drug that I chose, Ibuprofen, is an anti-inflammatory analgesic. It
is propionic acid that is white and powdery, and soluble in water, and organic
solvents such as ethanol and acetone. (1) Its structural formula is:
(CH3)2CHCH2 CH(CH3)COOH
Its role of action as a drug is not completely clear to the sciences,
but that with time w .....
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Insects
.... the ostia openings along the sides of the tube back to the heart.
The respiratory systems carries O2 to cells and takes away CO2 from cells
through branching out to call cells of body. The nervous system consists of a
brain receiving information from eyes, antennae, and controls the whole body and
2 nerve cords containing ganglia fused together to control activities of the
segment without the help of the brain. insect muscular system is made up of a
few thousand samll but string muscles allowing the insect .....
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Introns And Exons
.... finishes transcription, the Poly A tail is
added to the 3¹ end. As the two ends are placed the mRNA becomes pre-mRNA.
The pre-mRNA consists of splicing and non-coding regions. pre-mRNA
molecules are much longer than the mRNA molecule needed to code for its protein.
The regions that do not code for amino acids; aa, are scattered all along the
coding region. The genes are split with coding regions, called exons, short for
expressed regions; in between the exons the non-coding region called introns
ex .....
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Investigation Of Reproduction And Development In Animals
.... called
menstruation.
What is the birth control pill?
The combined oral contraceptive pill (the pill) is a reversable, hormonal
method of birth control. The pill consists of a mixture of two synthetic
hormones similar to oestrogen and progesterone, the woman’s natural hormones
which regulate the menstrual cycle. The pill is on of the most popular methods
of birth control.
How does it work?
The pill basically prevents ovulation, therefore, the ovaries can’t release a
mature egg. Without an egg for .....
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Cryogenics: Is It Worth Waiting For
.... negative two hundred and
seventy three point sixteen degrees Celsius--absolute zero. The word
"Cryogenics" comes from the Greek word “kryos” meaning cold (“Cryogenics”
Raintree 127, Kavaler 16). The science of cryobiology was first recognized in
the early nineteen sixties. Cryobiology is the study of the effects of
extremely low temperatures on living animals and plants. The chief concern in
cryobiology is to preserve living matter for future use. This method can also
be called cryopreservation. C .....
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Recognizing Laboratory Safety
.... will be using electricity in your
lab. Never touch an electrical socket or appliance with wet hands.
8. The symbol that looks like a duck means that you will be working with live
animals.
Analysis and Conclusion:
1. The person is not wearing safety goggles and he isn't really paying close
attention. Safety goggles are vital when you are working with fire.
2. She is pointing the vial towards herself. Whenever you are working with
heating liquids, the vial should never pointing towards you.
3. The .....
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Project Mercury
.... Carpenter; Air Force Captains L. Gordon Cooper, Jr., Virgil “
Gus” Grissom, and Donald K. “Deke” Slayton; Marine Lieutenant Colonel John H.
Glenn, Jr.; and Navy Lieutenant commanders Walter M. Schirra, Jr., and Alan B.
Shepard, Jr. Of these, all flew in Project Mercury except Deke Slayton who was
grounded for medical reasons. He later became an American crewmember of the
Apollo-Soyuz Test Project.
The Mercury module was a bell shaped craft. Its base measured exactly
74.5 inches wide and it was nine .....
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The Language Of The Cell
.... of shapes and sizes, although most cells are
microscopic. Inside a cell membrane, a nucleus can be seen. The nucleus is the
control center of the cell. Between the nucleus and the membrane, there is a
polysaccharide matrix called the cytoplasm, where organelles can be found. The
organelles are attached to a framework. The cell’s cytoskeleton.
Every living cell has the ability to detect signals from it’s
environment. The signals are usually in the form of chemical molecules, that
the cell has learne .....
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