215 results found, view free essays on page:
-
Clean Air Act Environmental Protection Agency
1,285 words
1990, the federal Clean Air Act was passed to
improve air quality in the United States.
President Bush's proposed amendments to the Clean
Air Act initially would have led to the
introduction of alternative, non-petroleum fuels.
The petroleum and oxygenate industries responded
by offering a reformulated gasoline program as a
substitute for most of the alternate fuel
proposals. As a result, the amendments to the
federal Clean Air Act adopted in 1990 required
steps to achieve lower vehicle emission...
Free research essays on topics related to: reformulated gasoline, clean air act, university of california, department of health, environmental protection agency
-
Fetus Produces Antibodies Fetus Produces Antibodies Specific Toxoplasmosis
1,061 words
I will be addressing the possible immunological
barriers that may be involved with challenge to
infection of Toxoplasmosa gondii, the protozoan
that causes toxoplasmosis. It is widely known that
toxoplasmosis is a devastating disease, with often
drastic consequences upon infection. In pregnant
mothers, these consequences can be very horrid.
Such effects are more felt by the unborn fetus
than by the mother. These effects include
abortion, premature birth, and severe growth
retardation (Creamy et....
Free research essays on topics related to: immune response, fetus, antibodies, placenta, fetal
-
Dust Particles Blue Light
1,256 words
Exploration of a Natural Colour Phenomenon Why
does the sky colour change? To answer this
question, one should be aware of the Earth's
atmosphere, and light. What is the atmosphere? The
sky is filled with air which is a mixture of tiny
gas molecules and small bits of solid stuff, like
dust (Why Is the Sky Blue? ). The air constitutes
the atmosphere, a gaseous shell surrounding the
Earth and some other planets. The main gaseous
components of the atmosphere are nitrogen (78. 09
%) and oxygen (20. ...
Free research essays on topics related to: blue light, sky, visible light, dust particles, mar 2007
-
Tay Sachs Disease White Blood Cells
2,021 words
... would fatally digest itself away. Some of
these enzymes break down proteins, others attack
fats, and still others disassemble the nucleic
acids that make up DNA and RNA (Bourne, 1992, p.
123). Lynosomes don't always work right. When they
fail, the result can be catastrophic disease. In
Tay-Sachs disease, for example, victims have
inherited a faulty gene, which leads to a
defective enzyme or no enzyme at all. As a result
certain undigested molecules accumulate in the
lysosomes, gradually lead...
Free research essays on topics related to: amino acid, white blood cells, part of the body, tay sachs disease, golgi apparatus
-
An Anatomy And Physiology Of The Organelles Cell
1,095 words
An Anatomy and Physiology of the organelles of the
cell In this paper I will examine an anatomy and
physiology of the organelles of the cell. The
branch of science which research deeply cells is
called cytology. I will not deepen in the cytology
because it is a really huge branch of science.
What I want to do is make a brief introduction and
acquaint you with main cytology thesis. After this
I will concentrate all my attention in organelles.
The cell is the structural and functional unit of
all ...
Free research essays on topics related to: ribosomal rna, organelles, endoplasmic reticulum, protein synthesis, golgi apparatus
-
Hydrogen And Oxygen Simple Sugars
329 words
Carbohydrate Structure and Function Carbohydrates
are molecules composed of carbon, hydrogen, and
oxygen. They are polymers of the basic units
called monosaccharides. Dissaccharides are
compound sugars, composed of two monosaccharides,
(simple sugars) bonded together. Molecular
Structure For example, two molecules of glucose
can bond together to form the Disaccharide
Maltose. Sucrose and Lactose are other common
Disaccharides. Dissaccharides are formed through
condensation reactions that result ...
Free research essays on topics related to: simple sugars, monosaccharides, carbon, hydrogen and oxygen, carbohydrates
-
Sugar Molecules Linked Aldehyde Or Ketone Group Monosaccharides
387 words
There are three principal kinds of carbohydrates
and each are classified according to the number of
sugar molecules they contain. Monosaccharides,
such as ribose, glucose, and fructose, contain
only one sugar molecule. Disaccharides consist of
two sugar molecules linked covalently. Familiar
examples are sucrose (table sugar), maltose (malt
sugar), and lactose (milk sugar). Polysaccharides,
such as cellulose and starch, contain many sugar
molecules linked together. Monosaccharides are
organic com...
Free research essays on topics related to: molecule, monosaccharides, energy source, sugar, glucose
-
Chemical Reaction Kinetic Energy
865 words
Rates of Chemical Reactions 1: I-Purpose: The rate
of a chemical reaction is the derivative of the
extent of the reaction with respect to time, to
measure the effect of concentration upon the rate
of the reaction of peroxydisulfate ion with iodine
ion; to determine the order of the reaction with
respect to the reactant concentrations; and to
obtain the rate law for the chemical reaction.
II-Material and: Four reaction solutions are
prepare as: -solution 1: 25. 0 mL KI solution 1. 0
mL starch sol...
Free research essays on topics related to: chemical reaction, blue black, black color, higher temperature, kinetic energy
-
Ozone Molecules Du Pont
579 words
The beginning of the CFC (chlorofluorocarbons) era
started in 1928, when CFC were invented by a Du
Pont chemist. CFC were best known as freon's and
became famous as a safe, nonflammable refrigerant.
It s invention became a great triumph when Freon
took the place of sulfur dioxide or ammonia which
was used as the working liquid in refrigerators.
It eventually became widely used in automobile air
conditioners and nontoxic propellants in aerosol
cans. It s insulating properties also was used for
bl...
Free research essays on topics related to: ozone molecules, living beings, du pont, large amounts, ozone layer
-
Clean Air Act Environmental Protection Agency
1,282 words
1990, the federal Clean Air Act was passed to
improve air quality in the United States.
President Bush's proposed amendments to the Clean
Air Act initially would have led to the
introduction of alternative, non-petroleum fuels.
The petroleum and oxygenate industries responded
by offering a reformulated gasoline program as a
substitute for most of the alternate fuel
proposals. As a result, the amendments to the
federal Clean Air Act adopted in 1990 required
steps to achieve lower vehicle emission...
Free research essays on topics related to: reformulated gasoline, department of health, environmental protection agency, university of california, clean air act
-
Short Term Memory Long Term Memory
1,246 words
REVIEW OF LITERATURE A person wakes up in the
morning, brushes his teeth, takes a shower, puts
on his clothes, and starts his day. What would
happen if there weren t such thing as memory?
People might not be able to get ready every
morning to start their day. Why? Because memory
allows people to remember what they have done or
not done. Memory is the ability to remember
something that has been learned or experienced.
So, without it, people wouldn t be able to
remember anything. They might not br...
Free research essays on topics related to: long term memory, short term memory, alzheimers disease, types of memory, cerebral cortex
-
Du Pont High Strength
971 words
The History of Kevlar Kevlar is an organic fiber
in the aromatic polyamide family. It has unique
properties and a chemical composition that is its
own, which distinguishes it from other man-made
fibers. Kevlar is a combination of high strength,
high modulus (resistance to extension), toughness
and thermal stability. Kevlar has a wide range of
uses. In the 1960 s nylon and polyester opened the
door for man-made fibers. They were cutting edge
fibers in their time but to achieve maximum break
stren...
Free research essays on topics related to: high strength, m 2, du pont, man made, 2 g
-
Ultraviolet Rays Uv Rays
633 words
The ozone layer shields the earth from most of the
harmful radiation and light comming from the sun.
The ozone reflects and absorbs the ultraviolet
rays that try to come in. Without this kind of
protection, all living things will be effected by
these UV rays. Skin cancer develops in most living
mammals as a cause of an overabundance of the suns
ultraviolet rays. The ozone layer is located in
the earths stratosphere. The ozone layer is
located from about fifteen-to-thirty kilometers
above the ear...
Free research essays on topics related to: squamous cell, skin cancer, ultraviolet rays, ozone layer, uv rays
-
Stratospheric Ozone Ozone Layer
2,496 words
The Atmospheric Ozone Layer The stratospheric
ozone layer exists at altitudes between about 10
and 40 km depending on latitude, just above the
tropopause. Its existence is crucial for life on
earth as we know it, because the ozone layer
controls the absorption of a portion of the deadly
ultraviolet (UV) rays from the sun. UV-A rays,
including wavelengths between 320 and 400 nm, are
not affected by ozone. UV-C rays between 200 and
280 nm, are absorbed by the other atmospheric
constituents besides...
Free research essays on topics related to: polar regions, ozone layer, ozone hole, stratospheric ozone, atmospheric circulation
-
Environmental Protection Agency Clean Air Act
2,294 words
The poisoning of the Earth? s ozone layer is
increasingly attracting worldwide concern for the
global environment and the health effects of life
on the Planet Earth. There is not just one
particular cause for the ozone? s depletion; the
accumulation of different pollutants into our
ozone layer has all added up and equaled a
worldwide problem. There is not just one effect
from the poisoning of the ozone, but instead
multiple ramifications from diseases to death. The
damage to the ozone is increas...
Free research essays on topics related to: ozone depleting, clean air act, environmental protection agency, ultraviolet radiation, ozone depletion
-
Carbon Atoms Ch 4
471 words
Element? a substance which cannot be broken down
into two or more substances by any means. Only
contains one type of atom. Compound? a substance
in which atoms of two or more elements have been
chemically combined. Ionic Bonding · Metals
bonding with non-metals · Involves transfer
of electrons from metal to non-metal, so that both
species obtain full outer shell electron
configurations (Noble gas configuration). ·
Metals lose electrons to form positive ions
(Cations). &middo...
Free research essays on topics related to: carbon atoms, electrons, covalent, middot, ch 4
-
Hydrogen Bonding Hydrogen Bonds
414 words
What properties of water make it a unique material
and an essential component of living matter? Water
is so common that it is easy to overlook the fact
that it is an exceptional substance with many
amazing qualities. With its properties, we can
trace water s unique behavior to the structure and
interactions of its molecules. Water is
constructed of two hydrogen (H) and one oxygen
(O). The hydrogen become + charged and the oxygen
maintains a charge when they combine to form
water. This is a singl...
Free research essays on topics related to: heat, hydrogen bonding, substances, hydrogen bonds, hydrogen
-
Calcium Carbonate Hydrochloric Acid
999 words
Reaction Rate Between Calcium Carbonate And
Hydrochloric Reaction Rate Between Calcium
Carbonate And Hydrochloric Acid Calcium carbonate
and hydrochloric acid react together. Plan an
investigation to examine the factors that effect
the reaction rate between them. I am trying to
find out what affects the reaction rate of calcium
carbonate and hydrochloric acid. Things that
affect the reaction rate are the temperatures of
the hydrochloric acid, the amount of hydrochloric
acid, the concentration of...
Free research essays on topics related to: hydrochloric acid, reaction rate, calcium carbonate, 10 cm, cm 3
-
Plastics Are Made Kind Of Monomer Plastic
628 words
Plastics are Plastic 2 PLASTICS Plastics are
man-made materials that can be shaped into almost
any form. They are one of the most useful
materials ever created. Our homes, schools, and
businesses are filled with plastic products.
Imagine cars without synthetic bumpers,
dashboards, steering wheels and switches; medicine
without plastic hypodermic syringes and artificial
hip joints. And what about telecommunications,
dependent on plastic telephones, circuit boards
and cable insulation. Our enterta...
Free research essays on topics related to: shape, plastic, plastics, chains, polymers
-
Make Anything Desired Machines Can Make Anything Desired Nano
676 words
Is Utopia Possible? The answer to that depends on
what your vision of Utopia is. In Gonzalos world
everything would be provided by nature, people
would be innocent and uneducated and there would
be no such thing as violence because there would
be no access to weapons or alcohol. Gonzalos
vision is a nice thought but I feel he has
underestimated the humans need for material
objects. My belief is that Humanity will reach
Utopia by acquiring powerful technological
abilities, while human characteris...
Free research essays on topics related to: orange juice, machines, nano, desired, glass
215 results found, view free essays on page: