Science Essays
House cats
House cats The animal that I picked to reasherched on is a house cat. Classify: The cat would best fit in the Animalia kingdom. phylum: Chordata(vertebrate) Class: Mammals Order: Pulicidae Family: Siphonaptera Genus: Felis Species: domesticus (a) It depends on others for food. (b)Cells are flexible. The way a cat would reproduce would be sexually. In order to produce sexually you have to have a male and female, or “sperm, and a fertile egg”...
How dams affect salmon migration
How dams affect salmon migration The 1,000 plus species of Salmon and Steelhead that live off the western coast of the United States and breed in the rivers and tributaries of California, Washington, and Oregon have greatly fallen in population. 106 species have become extinct and 314 more are at risk of extinction in the Columbia River Basin, the focus of this report. The causes of this are dams on the rivers stopping salmon from breeding and smolt from returning to the ocean, and commerc...
How does light affect the rate of photosynthesis
How does light affect the rate of photosynthesis? Biology Investigation Problem: How does light affect the rate of Photosynthesis? The Plan In my experiment I am going to see how light affects the rate of photosynthesis. To do this experiment I am going to set up the apparatus as shown in figure 1. The apparatus I am going to use are the following: - 1 Tripod 1 300ml Beaker 1 Boiling Tube 1 Clamp Stand 1Clamp 1 Boss 1 Ring Binder 1 Lamp 1 1 Metre Ruler 1 Thermomete...
How eagles live
How eagles live How the Eagles Live My purpose of this paper is to explain the different types of eagles and how they live. The bald eagle has the scientific name of haliaetus leucocephalus and is named for its white feathers that cover its head and neck. It is from the family accipitridae. An adult bald eagle is usually 40 inches long, and has a wingspan of about 6-7 feet. The adult bald eagle is dark brown with a white head and tail. An immature bald eagle is all brown...
History of the f 16
History of the f-16 Introduction The first F-16 was developed in 1974. They wanted a lightweight fighter that wouldn’t cost as much as the fighters they had at the time. They also needed a way to have a bomber without going out and building another bomber which would cost millions more. So they decided to turn the F-16 into a fighter/bomber and it all worked out. Here’s how. The Lockheed F-16 Fighting Falcon They F-16 Fighting Falcon was developed and produce...
History of the prostate gland
History of the prostate gland HISTORY OF THE PROSTATE GLAND The prostate is a gland that is located just underneath the bladder. It surrounds the urethra through which a man urinates. The prostate gland is therefore vital to proper bladder control and urine flow-rate. The prostate is also essential for normal sexual function. It is the gland of ejaculation, supplying 95% of the seminal fluid and the power to push it through the urethra and out of the penis. The norm...
Hiv
Hiv HIV Since the first AIDS cases were reported in 1981, through mid-1994 more than 402,000 AIDS cases and more than 241,000 deaths have been reported in the United States alone. This is only the tip of the iceberg of HIV infection, however. It is estimated that nearly 1 million Americans had been infected with the virus through the mid-1990s but had not yet developed clinical symptoms. In addition, although the vast majority of documented cases have occurred in the United States, AIDS ca...
Hot zone
Hot zone Hot Zone Imagine walking into a tiny village in Africa, suffering and dying from some unknown virus. As you approach the huts you hear the wails of pure agony from the afflicted tribe members. Coming closer, you smell the stench of vomit mixed with the bitter smell of warm blood. People inside lay dying in pools of their own vital fluids, coughing and vomiting up their own liquefied internal organs; their faces emotionless masks loosely hanging from their skulls, the connective...
History and development of the internet
History and development of the internet History and Development of the Internet The internet is a global computer network connecting millions and millions of users throughout the world. (Leiner, 2). It has become one of the fastest growing forms of communication today. (Marshall, 1). The Internet started as a Defense Department Cold War experiment in the 1950’s. (Academic American, 225). The government needed a way to relay information between tanks and headquarters so the...
History of birth control
History of birth control History of Birth Control Although birth control has been practiced since ancient times, the first organized efforts developed during the 19th century as population increased dramatically because of improved medical care, nutrition, and sanitation. However, birth control met with resistance. In 1873 the United States Congress enacted the Comstock Law, which prohibited the distribution of birth-control devices and information. During the early 1900s, American nu...
History of cell membrane
History of cell membrane In the early stages of the twentieth century, little was known about cell membranes. Until the early 1950s, the biological cell membrane was rarely mentioned in scientific literature. It was recognised that something was probably there, but hardly anything about it was known. Considering the lack of technical equipment available a century ago, scientists such as Charles Overton and Edwin Gorter were not only exploring new territory in looking at the properties of cel...
History of computers
History of computers History of Computers Introduction: The electronic computer has now been used commercially for less than 25 years. It grew out of a search lasting centuries for a more accurate, faster way to perform calculations. Primitive and ancient man used his fingers, shells, beads, sticks, and other objects to keep track of numbers and sums. The development of paper and writing instrumentsmade it easier to record data, but gave little aid in manipulating it. Manual...
History of the aircraft propeller
History of the aircraft propeller History of the Propeller The aircraft propeller looks like a simple mechanism to the uneducated individual. To the educated, an aircraft propeller represents the highest sophistication in aerodynamics, mechanical engineering and structural design. This report will touch on the history of the propeller, from early pioneers/experiments, advancement during/after the war, all the way up to current applications of the propeller. The creation ...
Hereditary colon cancer
Hereditary colon cancer Hereditary Colon Cancer Colon cancer is one of many cancers to plague United States citizens. There are four known types of colon cancer. Fourteen percent of all cancers diagnosed are colon cancer. Colon cancer is the third most commonly diagnosed cancer. Sporadic cancer accounts for 80 percent of all colon cancers and is considered non-hereditary. The remaining 20 percent of cancer are related to heredity. Familial Adenomatous Polyposis Coli (FAP) and Hered...
Heroin a long dark path
Heroin a long dark path An introduction to Heroin- The use of hard drugs in America is on a steady rise. Heroin is one of the biggest reasons for this. Heroin is one of the most dangerous highly addictive drugs on the black market today. A board member on the National Institute of Health estimated that there are currently about 600,000 heroin addicts in the U.S. alone. Only an estimated 115,000 thousand of those addicts have been admitted into a treatment program. As the demand grows ...
Herpes
Herpes Herpes is one of the common of more than 30 different sexually transmitted diseases (STD’s) in America today. Herpes is an infection that is caused by one of two closely related viruses, herpes simplex virus type 1 (HSV-1) and herpes simplex virus type 2 (HSV-2). Both of which are very easily caught, have similar symptoms, and can occur on different parts of the body. Even though it is most common to see the virus HSV-1 appear as oral herpes and to see the virus HSV-2 appear ...
Historic model of science
Historic model of science The ‘heroic model’ of science is one of the most influential phenomena in history. This surge of value-free knowledge, filled with realism, bold justification, absolute truth and complete objectivity, changed the way in which the world was perceived and how the future would be viewed. The ‘heroic model’ changed the rules and ushered western civilization into a new era, filled with wonderfully shocking scientific surprises. The backlash from...
Hemp miricale plant
Hemp - miricale plant Hemp - Miracle Plant Is there a single plant that could possibly save the world? Because of its vigor and adaptability, it was amongst the first plants to be cultivated by humans and has been used and grown by many cultures for thousands of years. Yet, today people are fined, even jailed for growing this plant because it is illegal. Lawmakers fail to see that this sole plant probably has more uses than any other material on earth. The entire plant can be utili...
Hepatitis b 2
Hepatitis b 2 Hepatitis B can be prevented with a highly effective vaccine, but this year ten to thirty million people will become infected with the hepatitis B virus. I feel that because this disease is preventable, only knowledge can help reduce the number of people infected. Hepatitis B is a serious liver disease caused by the hepatitis B virus. This virus is a blood-borne pathogen. It is one hundred times more infectious than HIV. “Hepatitis B is one of the most f...
Hepatitis b virus
Hepatitis b virus The Hepatitis B Virus (HBV) HBV is a mostly double-stranded DNA virus in the Hepadnaviridae family. HBV causes hepatitis in human and related virus in this family cause hepatitis in ducks, ground squirrels and woodchucks. The HBV genome has four genes: pol, env, pre-core and X that respectively encode the viral DNA-polymerase, envelope protein, pre-core protein (which is processed to viral capsid) and protein X. The function of protein X is not clear but it may be involve...
Hepatitis b
Hepatitis b Risk Factors for HBV Infection Although relatively rare in the United States, hepatitis B is endemic in parts of Asia where hundreds of millions of individuals may be infected. HBV is transmitted horizontally by blood and blood products and sexual transmission. It is also transmitted vertically from mother to infant in the perinatal period which is a major mode of transmission in regions where hepatitis B is endemic. The blood supply in developed countries has been scre...
Hepatitis
Hepatitis THE PRIORITY OF HEPATITIS B VACCINATIONS IN CANADA The increase in the number of children attending schools in Canada and the potential for transmission of viral infection in that environment is a problem of great size. A virus is defined as "a morbid principle, or a poisonous venom, especially one capable of being introduced into another person or animal" in The Shorter Oxford English Dictionary. Due to their miniscule size, it was not until 1885 that Adolf Mayer observed ...
Hemophilia 4
Hemophilia 4 Hemophilia is the best known of hemorrhagic disorders. When a person has hemophilia, the blood does not clot properly and bleeding persists. The people who have hemophilia are called hemophiliacs or bleeders. Bleeding disorders, such as hemophilia, result from a disruption of the body's process of how blood clots are formed. The coagulation process involve platelets as well as plasma proteins called clotting factors. Clotting begins when platelets stick to the site of an i...
Hemophilia manitoba
Hemophilia manitoba Hemophilia Manitoba Hemophilia Manitoba, or hemophilia, is a sex-linked genetic disorder that is effecting about 20,000 Americans, most of which males. A person with hemophilia either has an inactive or inadequate supply of one of several blood factors needed for blood to clot. Because of this hemophilia can be mild, moderate, or severe. Severe hemophiliacs are at risk for bleeding during surgery, trauma, or even dental work. There are two types ...
Hemophilia
Hemophilia In the human body, each cell contains 23 pairs of chromosomes, one of each pair inherited through the egg from the mother, and the other inherited through the sperm of the father. Of these chromosomes, those that determine sex are X and Y. Females have XX and males have XY. In addition to the information on sex, 'the X chromosomes carry determinants for a number of other features of the body including the levels of factor VIII and factor IX.'1 If the genetic information determinin...