Science Essays
Lime disease
Lime disease Lime Disease Lyme disease is caused by Borrelia burgdorferi, which is a tick-borne spirochete. The dangers of this disease became more publicised in 1977, where a geographic grouping of children in Lyme, Conneticut were thought to have juvenile rheumatoid arthritis1. Soon after, it was discovered that lyme disease was an illness that mainly affects the skin, nervous system, heart, and joints. The borrelia species is part of the eubacterial phylum of spirochete...
Linux 2
Linux 2 Table of Contents LINUX I. Introduction A. What is Linux 1. Where did Linux came from 2. When was Linux introduced 3. Types of Linux B. Benefits of Linux 1. Performance 2. Usability 3. Features 4. Cost II. Getting Started A. System Requirements B. Installation III. Cool Stuff A. X Windows B. Networking C. System Administration IV. Conclusion What is LINUX? LINUX is a free, hig...
Lepus americanus
Lepus americanus Lepus americanus Lepus americanus (snowshoe hare) belongs to the Phylum: Chordata, Class: Vertebrata, and Order: Mammalia. Lepus americanus is common to the northern boreal forests of North America extending south into higher elevations of the Rocky and Appalachian Mountains. It's main diet consists of plant shrubs in summer and in winter forage on ground vegetation by digging feeding craters into the ground (Gilbert, 1990). Experiments conducted by Krebs et al. ...
Leukemia
Leukemia Leukemia Leukemia is a disease that affects blood-forming tissues, mainly bone marrow. Leukemia also affects the lymph glands and spleen. Leukemia causes the body to produce an extreme amount of abnormal white blood cells. This causes infections because the abnormal cells cannot stop infections like the normal cells do. Leukemia also causes anemia. Anemia is a disease in which the body makes less blood cells. This happens because the leukemic cells crowd ...
Lichens
Lichens LICHEN. On places like tree trunks, rocks, old boards, and also on the ground grow strange splotches of various-colored plant life called lichens. They are of great scientific interest because they are not single plants; instead, each lichen is formed of a fungus and an alga living together so intimately as to seem a single plant. The lichens are one of the best illustrations of symbiosis, the intimate living together of two different kinds of organisms. The fungus makes the bulk of ...
Lift, weight, thrust and drag
Lift, weight, thrust and drag One of the first things that is likely to be noticed during a visit to the local airport is thewide variety of airplane styles and designs. No matter what each looks like like they alldepend on the the same four factors which are lift, weight, thrust, and drag Lift is the upward force created by the effect of airflow as it passes over and under the wings. It supports the airplane in flight. Weight opposes lift. It is caused by the downward pull of gr...
Light
Light Light is what we see. It can be thought of either as a particle, (the photon), or as a wave. The photon we can easily think of as a small dot travelling through space at the speed of light. Each photon has a particular colour or energy. But how do we think of light as a wave? For this we need to know that light is also an "Electro-magnetic field" -- a combination of electric-field and magnetic-field -- the same thing that causes static electricity and magnets to attract (or repel) thin...
Le virus ebola (spanish essay)
Le virus ebola (spanish essay) Le Virus Ebola Le virus d'Ebola, est un virus terrible. Ebola est un virus qui tuer les hommes dans un forme terrible. Il y a beaucoup des question quand nous parlons de la virus Ebola. Les question sont, comment est ce-que le virus nous tueons?, que ce-que c'est les symptomes?, comment est ce-que les gens le contract?, est que ce-qu'on peut faire pour nous proteger? L'histoire d'Ebola Le virus Ebola est apparue en 1976, en Afrique. Cette...
Leprechaunism
Leprechaunism “Leprechaunism” Leprechaunism is an extremely rare genetic disease that was first identified in 1948 by W.L. Donohue. There have only been 49 cases reported worldwide since is first reporting in 1948 until 1987. This disease is also known as Donohue Syndrome, in his honor. Most Leprechaunism patients die by the age of 10 months, although there have been cases of patients living until 11 years of age. This is because several different mutations in the ins...
Leprosy 2
Leprosy 2 Leprosy is a chronic infectious disease of human beings that primarily affects the skin, mucous membranes and peripheral nerves. It is a disease that has existed for thousands of years, however, the formal discovery of the leprosy bacillus Mycobacterium leprae was not until 1874. Norwegian physician Gerhard Henrik Armaeur Hansen was the first to formally identify the bacillus, and in his recognition, leprosy is also referred to Hansen's disease. Leprosy is a disease that poorl...
Leprosy
Leprosy Leprosy or Hansen's Disease, is a disease that affects primarily the skin and nerves. It was discovered in 1874 by a Norwegian physician Gerhard Henrik Armauer Hansen.The disease was thought to have started somewhere in India and then was past on to Africa and Europe. In the late 1800's leprosy was very common throughout Europe. It became less and less through Europe and spread to areas of Africa that had bad nutrition and unhealthy living environments. Today the disease is not ve...
Lasers and their applications
Lasers and their applications Laser is an acronym for light amplification by stimulated emission of radiation. In the last century many types of lasers have been used for many different applications from welding to surgery to military and even many uses in every day life by harnessing the principles of light and stimulated emission. To understand how lasers work we must first understand the physics behind light waves. Light is emitted from a source and travels in straight lines and w...
Lasers
Lasers L A S E R S Did you know that some laser beams are small enough and powerful enough to drill two hundred holes on a spot as tiny as the head of a pin? The first major advancement in laser development came in 1954. This was the year that Charles H. Townes, an American physicist, created a device that amplified microwaves. This device was actually called a maser at first, which was short for Microwave Amplification by Stimulated Emission of Radiation Masers. It produced microw...
Laziness
Laziness Why are we so lazy? Keratinization, absence of granular layer, and depositation of antibodies and complement components in the stratum corneum. Most notable is the hyperproliferation of keratinocytes in the epidermis. These keratinocytes exhibit an increased mitotic rate and have ten times the turnover rate of normal keratinocytes. There is also an infiltration of CD4+ T lymphocytes, monocytes and neutrophils into the epidermis. Recently there has been much debate over...
Larnyx cancer
Larnyx cancer Cancer Information: Larynx Cancer Larynx cancer is a cancer that effects the larynx, or voice box, in people; it can also be called laryngeal cancer. The cancer occurs most frequently in people over the age of fifty-four and in black males. The larynx is approximately two inches long and is located below the nose passage way and above the trachea. Tumors can develop anywhere in the three parts of the larynx, the glottis, supraglottis, and subglottis. When the cancer spr...
Lasers
Lasers - Lightning, the thunderbolt from mythology, has long been feared as an atmospheric flash of supernatural origins. In the East, early statues of Buddha show him carrying a thunderbolt with arrows at each end. Indian tribes in North America believed that lightning was due to the flashing feathers of a mystical whose flapping wings produced the sound of thunder. Today, scientific rather than mystical techniques are used to explain lightning with experimental procedures replacin...
Lasers 2
Lasers 2 The laser is a device that produces a beam of light. The beam is produced by a process known as stimulated emission, and the word “laser” is an acronym for the phrase “light amplification by stimulated emission of radiation.” Lasers amplify light and produce coherent light beams. A light beam is coherent when its waves or photons are in step with one another. Laser light can be made extremely intense, highly directional, and very pure in color. BASIC ...
Lasers 3
Lasers 3 The idea for the laser started as long ago as 1905 when Albert Einstein suggested the simulated emission of light. Light sources ie. candles, florescent substances, torches, and light bulbs give of packets of energy, called photons, when their atoms are excited by energy. Einstein suggested that these atoms could be artificially stimulated to emit photons, where the light produced would be highly concentrated, bright and powerful and could be used for many tasks. Even though Einstei...
Lasers 4
Lasers 4 The laser is a device that a beam of light that is both scientifically and practically of great use because it is coherent light. The beam is produced by a process known as stimulated emission, and the word "laser" is an acronym for the phrase "light amplification by stimulated emission of radiation." Light is just like radio waves in the way that it can also carry information. The information is encoded in the beam as variations in the frequency or shape of the light wave. Th...
Klinefelter Syndrome
Klinefelter Syndrome Klinefelter syndrome, also called testicular dysgenesis, is the phenotype of the 47,XXY genotype and is characterized by male hypogonadism and infertility. Klinefelter Syndrome is probably the most common chromosomal variation found in humans. In random surveys, it is found to appear about once in every 500 to one in every 1,000 live born males. Since the largest percentage of these men would have never been diagnosed otherwise, it shows that in many cases affected indiv...
Knee surgery
Knee surgery Knee surgery It was my first practice for the 1994 wrestling season. Even after the long football schedule, I felt at home down in the wrestling room. The familiar scent of stale sweat filled my nostrils as I began to practice. I had been drilling for thirty minutes when "POP" my knee buckled; I dropped to the ground writhing in pain. My knee was locked and my teammates had to carry me off of the mat. Later that night I had knee surgery and it appeared as if I would ne...
Lab report of the cells
Lab report of the cells Introduction: The Cell, the fundamental structural unit of all living organisms. Some cells are complete organisms, such as the unicellular bacteria and protozoa, others, such as nerve, liver, and muscle cells, are specialized components of multicellular organisms. In another words, without cells we wouldn’t be able to live or function correctly. There are Animal Cells and Plant Cells. In Biology class the other day we studied the Animal Cell. We were split in...
Large mouth bass
Large mouth bass There is a huge sound, as the perfect large mouth bass jumps after a low flying bug. With one gulp the fly is gone and so is the bass. The large mouth bass is one of the best predators of the water. With no warning of attack it jumps out and kills its prey. The large mouth bass uses many of the fourteen behaviors. The one used most often however is ingestive. The bass uses all of its behaviors to go after its food. The fourteen behaviors are investigative, ingestive, ...
Kevlar
Kevlar 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 1960s nylon and polyester opened the door for man-made fibers. They were cutting edge fibers in their time but to achi...
Killer Bees
Killer Bees The Africanized Honey Bee is actually a variety of honeybee derived by hybridization from African honeybees naturalized in the western hemisphere. Because they are highly defensive and will attack perceived intruders more readily than the common European honeybee, they are also known by the popular name of �killer bees.� Brazilian scientists imported African honeybee queens in the 1950�s in order to breed a honeybee for use in tropical climates. Some swarms escaped into ...