Papers on Science and Environment
Mononucleosis
Words: 1880 - Pages: 7.... occurs slightly more often in men than in women. Doctors estimate that each year 50 out of every 100,000 Americans have symptoms. Among college students, the rate is several times higher. does not occur in any particular "season," although authorities in colleges and schools, where the disease has been well studied, report that they see most patients in the fall and early spring. Epidemics do not occur, but doctors have reported clustering of cases. Transmission: EBV, the virus that causes most cases of , infects and reproduces in the salivary glands. It also infects white blood cells called B cells. Direct contact with virus-infected sali .....
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The Atom
Words: 1577 - Pages: 6.... atom: the particulate theory of
matter was therefore justified for the first time convincingly by physical
experiment. They sang success at the annual Cavendish dinner.
Armed with the electron, and knowing from other experiment that what was
left when electrons were stripped away from an atom was much more massive
remainder that was positively charged, Thomson went on in the next decade to
develop a model of the atom that came to be called the "plum pudding" model.
The Thomson atom, "a number of negatively electrified corpuscles enclosed in a
sphere of uniform positive electrification" like raisins in a pudding, was a
hybrid: partic .....
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Mitosis
Words: 239 - Pages: 1.... are made to be ready for to take place. The chromatis is coiled up and consists of loose threads. In prophase, the next longest stage, the chromatin becomes chromatids which later form chromosomes. They are attached to the centrioles by spindle fibers. The chromosomes are lined up in the center of the celll. The nucleolus and nuclear membrane disappear. In the next phase, metaphase, the chromosomes line up along the metaphase plate. The plate is the midpoint of the cell between the two centrioles which are located at opposite poles. During anaphase, the centrioles start playing tug of war with the chromosomes. The chromosomes split in .....
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ALCHEMY
Words: 1357 - Pages: 5.... the reputation of being skillful workers in
metals and, according to Greek writers, they were conversant with their transmutation, employing quicksilver in
the process of separating gold and silver from the native matrix. The resulting oxide was supposed to possess
marvelous powers, and it was thought that there resided within in the individualities of the various metals, that in
it their various substances were incorporated. This black powder was mystically identified with the underworld form
of the god Osiris, and consequently was credited with magical properties. Thus there grew up in Egypt the belief
that magical powers existed in .....
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Octopuses
Words: 1043 - Pages: 4.... internal plumbing along with other specialized systems such as well developed open circulatory system, a complete digestive tract, along with excretory and nervous system, they are classified under the Mollusca phylum. It then goes under the classification of Cephalopod along with squids and chambered nautilus. From there it is ordered as Octopoda, (Family) Octopodidae, (Genus) Octopus. Then its species differ to differentiate one octopus from another. A common octopus's species is labeled as vulgaris.
A common octopus's scientific name:
Kingdom: Animalia
Phylum: Mollusca
Classification: Cephalopoda
Order: Octopoda
Family: Oct .....
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Ivf - In Vitro Fertilisation
Words: 1069 - Pages: 4.... ripe, they are retrieved by transvaginal needle aspiration, guided by ultrasound. At the same time, semen samples from the husband (or donor) are obtained. The most active and healthy sperm are selected by forcing
them to swim through a culture medium.
- The egg and sperm are placed together in a suitable medium for fertilisation to occur in a culture dish. If fertilisation does not occur after 72 hours, the oocytes (incompletely developed eggs) and sperm are disposed of. The
resulting embryos are observed for the next few days.
- A small plastic tube is inserted through cervix to place embryos into the uterus. The patient is .....
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Plant Evolution
Words: 832 - Pages: 4.... Plants. This new period (the second stage) in plant history occurred within the next 50 million years (400-500 million years ago). Some of these developed root systems stems and leaves. They also formed woody tissue, which created stiffer stems, which eventually developed into tree trunks. They became tree-like and up to 40 meters tall, forming the world's first forest.
'The Age of Seed Bearing Plants' was the next stage of plant history where plants were taken to their next step up in the evolution. This occurred around 280 million years ago. This was also the dinosaur era. Earth began to become a lot drier, and these plants began to a .....
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Genetic Engineering
Words: 1733 - Pages: 7.... New Yorker, March, 1998].
There is widespread consensus that the information reported in that article is true. One of the things
he mentions is that the former Soviet Union had the largest big-warfare program in the world, with
32,000 scientists working on it. Much of it had to do with genetic engineering. In one of the projects
they took smallpox, which has otherwise disappeared from the world, and found a way to genetically
introduce into it, without reducing its efficacy as smallpox, either Ebola virus or equine encephalitis
viruses. Nobody seems to know what happened to those experimental viruses.
A third example: w .....
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Manic Depression
Words: 331 - Pages: 2.... hopeless. They also have negative thoughts towards the past and future. Many people go
through guilt, crying, or having suicidal thoughts. Unlike a manic episode, the person has lack of energy, and either an appetite loss or gain.
is a recurrent illness, so a person usually has more than one episode. These episodes can last from weeks to months. They occur whenever and have no certain pattern. Sometimes a stressful life event can trigger an episode, and sometimes they just happen. If a person has more than four episodes a year they are
known as “rapid cyclers”. This is more common in women.
There is no exact reason for .....
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Data Warehousing
Words: 3282 - Pages: 12.... years, data warehousing has emerged as one of the hottest trends in information technology for corporations seeking to utilise the massive amounts of data they are accumulating.
Managers from all business disciplines want enterprise wide information access, as well as the ability to manipulate and analyse information that the company has gathered for a single purpose, to make more intelligent business decisions. Whether to increase customer value, identify new markets or improve the management of the firm's assets, the data warehouse promises to deliver the information necessary to accomplish these tasks quickly and efficiently.
Thi .....
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