Topic Responses Essay Example | Topics and Well Written Essays - 500 words

Topic Responses - Essay Example Stem cell research entails investigations on basic cells that have the ability to create other cells. Stem cell research has always been a controversial issue, but from my perspective, I believe it will have a lot of advantages (Cohen, 2012). Stem cell research will provide a breakthrough in medicine through coming up with means of treating some of the incurable diseases present todays (Cohen, 2012). With proper advancement of this field and proper channeling of the knowledge in stem cell, management of some incurable diseases might become possible in the future when they can manage to make the stem cells regenerate newer cells (Cohen, 2012). Bacteria are unicellular living microorganisms whereas viruses are nonliving. Viruses often live in a host in order to multiply whereas bacteria can even grow on any non-living surface (Cohen, 2012). Furthermore, viruses often invade a given host’s cells and then turn the given cell’s genetic material to make their own products (Cohen, 2012). Bacteria on the other hand carry their machineries needed for growth and multiplication with them. Viruses only carry information inform of DNA or RNA packaged in a proteins coat (Cohen, 2012). The commonest method used in identification of most bacterial species is the gram staining method (Cohen, 2012). This method is often used in identifying gram positive and gram negative bacteria on their basis of their cell wall properties. The first stain applied is the crystal violet, which then the bacteria is treated with a given mordant (Cohen, 2012). Later, the bacteria is washed by a decolorizing agent like alcohol then stained with safranin (red dye). Gram positives will be stained violet while gram negatives pink (Cohen, 2012). Acid fast staining is often used for bacteria that are not gram staining. It is mostly used for acid fast bacteria like

Manila and Jose Rizal Essay Example for Free

Manila and Jose Rizal Essay Jose Rizal is our national hero but seriously i don’t know a lot about him. But when I watched the film about Dr. Jose Rizal I was shocked and amazed because of his sacrifice for our country. I though the he was a brilliant individual. He served as an inspiration to all Filipino. During his lifetime, he spent many years outside the Philippines, enriching himself through education, especially in Madrid, Spain. The distance did not diminish nor reduce his love for his country. Far from his motherland, he looked across the seas to find its strength, as well as its weaknesses, in order to uplift it from the abuses of foreign rule. One of the problems and this I feel strongly, with our current approach to Rizal is that it removes him from our ability to relate. But to continue to hold that up as a reason why he should be admired is kind of ridiculous. Because of how we approach Rizal, with all these misguided attempts at humanizing him, we fail to approach him as he would have wanted: Through his ideas, his dreams, his hopes, his understanding in the Philippines, his words that inspire many Filipinos. His real words, not those carefully edited. Not the number of women he supposedly slept with. And most definitely not in the number of languages he spoke. Rizal and I shared the same belief that students must be urged by patriotic ideals and by their passionate love for their country, the Philippines, love for truth and proper values of education. Dr. Jose P. Rizal had given proof of desiring liberty for his country, and he set down as a premise, the education of the people. His teachings greatly influence in me. Like him, I believe in people power and consider myself a modern Rizal youth of today, as the hope of my motherlands tomorrow. He is very nationalistic and I want to reserve my nationalism as well. Like Rizal, Im proud to be a Filipino.

Rabbit Genetics :: essays research papers

Rabbit Genetics The similarity between the physiology of rabbits and humans makes the rabbit a good model for research into human disease. The most prevalent types of rabbits are cottontails and European rabbits. Domestic rabbits are tame assortments of European rabbits. The Californian, Florida White, and New Zealand White are the most common breeds used in research. Until 1912 rabbits were classified as rodents. Scientists discovered that the two types of animals differed in several distinct anatomical ways. Rabbits, for instance, have a second pair of upper incisors, known as "peg teeth," that are found behind the two main visible incisors in the upper jaw. Rabbits have elongated hind legs adapted for moving at high speeds over open areas. Rabbits generally move in a hopping motion. They also have webbed toes to keep them from spreading as they hop. Rabbits have flexible necks, which allow them to turn their heads more than rodents. Their spines are long and fragile and susceptible to fractures if the animal is held improperly. Research The ability to produce tumors in rabbits makes them useful models to study chemo/immunotherapy, as well as immunoprevention of certain cancers. Cholesterol studies: Rabbits have been used to test Probucol, a drug that lowers blood cholesterol and retards the development of hardening of the arteries. Eye ear and skin studies: Rabbits are used to study middle and inner ear infections, which affect millions of infants and children each year. †¢ Rabbits are also used to study Entropion, a condition in which the eyelashes are turned inward, as well as Glaucoma, which often results in blindness. †¢ Rabbits are used in eye and skin irritation tests to develop appropriate procedures for handling certain chemicals and to predict the toxicity of accidental exposure. †¢ More than 10,000 blind or visually impaired people have benefited from corneal transplants, possible only because of hundreds of trials on rabbits. Drug metabolism: Rabbits have been used to study the effects of marijuana on the central nervous system. Pregnacy Test Presently a woman who wants to find out if she's pregnant need only make a quick trip to the local drug, grocery, or convenience store; purchase an over-the-counter home pregnancy test kit; perform a simple test; and she'll know the results within a matter of minutes. Not so long ago, however, it was not nearly as quick or easy: Awomawho thought she might be with child had to schedule an appointment with her doctor, make a trip to his office, give a urine sample, go home, then spend an anxious couple of days waiting for the office to telephone with the test results.

Inuits of Greenland: An Adaptive Society Essay -- Geography Geographic

Inuits of Greenland: An Adaptive Society In a world far different from our own in the Northern Hemisphere lies an indigenous society known as the Inuits. Specifically focusing on the Inuits of Greenland these people have adopted various risk management strategies which has enabled them to survive in a harsh arctic environment. In indigenous cultures, their well-being and sustainability is managed through control of population growth like most present day indigenous societies have been influenced by western ideas and technologies, in which some of these influences have been beneficial while other western influences have threatened their traditional way of life. The Inuits or â€Å"Kalaallit† are the native people of Greenland, they have lived there for almost one thousand years. Today Greenland’s population is around 55,000, 85 percent of whom are Inuit (Caulfield:1997,1). The national language is Greenlandic, which is an branch of Inupik, or Eskimo language. There are three dialects according to the region in which they are spoken, such as West Greenlandic, East Greenlandic and Polar-Eskimo. Hunting, along with fishing is fundamental to their livelihood. Today, the Inuits are highly dependent on traditional methods of obtaining food through hunting and fishing. Inuits were first introduced to Westerners in the Thirteenth century. The encounters began between the Norse colonists on Western shore and Inuit hunters. During the 17th and 18th centuries, traders returned to Europe with many artifacts from the Inuits. They also took these indigenous people as slaves, stolen from their native land to be put on display. The Inuits were viewed as heavy but happy people surviving in a rough environment. These i... ...Wendell H., Eskimos and Explorers. Novato, California: Chandler and Sharp Publishers, Inc., 1979. Lamblin, Robert Joelle, â€Å"Socio-demographic situation of the Yuit and Inuit Eskimos and Chukchis of Chukotka.† Etudes/Inuit/Studies, v. 17 (2): pp.73-96, 1993. Silis, Ivars. â€Å"Narwhal Hunters of Greenland.† National Geographic v.165: pp. 520-539, 1984. Smith, Eric A., Smith Abigail S., Inuit Sex-Ratio Variation, Population Control, Ethnographic Error, or Parent Manipulation.† Current Anthropology, v.35 Dec. Dec.1994, p.595-604. Weissner, Polly, â€Å"Risk, Reciprocity and Social influences on !Kung San Economics.† Course packet, p.43-55. Britannica Encyclopedia Online. http://www.Encyclopedia Britannica Encarta Encyclopedia Online Deluxe. http://www.encarta.com Greenland Guide.http://www.greenland-guide.com

Radon Gas Case Study Essay

OBJECTIVE: Build a simple ionization chamber that is capable of detecting fairly low levels of radiation BACKGROUND OF THE STUDY Radon is a cancer-causing gas. It comes from the natural breakdown of uranium in soil, rock and water and gets into the air you breathe. These radioactive materials â€Å"decay† into lighter elements, emitting energetic sub-atomic particles in the process, and one of those lighter elements is Radon. Since radon is a noble gas, it is chemically inert and doesn’t stay bound in the solid the way it’s parent did. It diffuses right through solids and ends up floating freely in the air. Being a noble gas, radon is fairly harmless, itself. You breathe in some radon with every breath but then you breathe it right back out, since it isn’t chemically active or electrically charged. But radon has a short half-life of only about four days, meaning that about half of it will decay within four days, producing new, even lighter radioactive isotopes of other elements like polonium, lead, and bismuth. Those isotopes keep decaying, until a stable isotope of lead is reached. These radon â€Å"daughters† are not noble gasses like radon, they are usually ionized when they are produced, and they will readily stick to anything nearby, like healthy lung tissue. They typically have an even shorter half-life than radon and quickly decay inside the lung, kicking out energetic alpha and beta particles that can cause tissue damage and potentially trigger lung cancer. This unfortunate chain of events is due to the decay chain including a noble gas. Radon gas is considered to be the second leading cause of lung cancer. It can get into any type of building — homes, offices, and schools — and result in a high indoor radon level. But, we are most likely to get your greatest exposure at home, where we spend most of our time. It typically moves up through the ground to the air above and into your home through cracks and other holes in the foundation. Any home traps radon inside, where it can build up. Any home may have a radon problem. This means new and old homes, well-sealed and drafty homes, and homes with or without basements. These are examples where you can find the noble gas: 1. Cracks in solid floors 2. Construction Joints 3. Cracks in walls 4. Gaps in suspended floors 5. Water supply It breaks down into solid radioactive elements called radon progeny. Radon progeny can attach to dust and other particles and can be breathed into the lungs. As radon and radon progeny in the air break down, they give off alpha particles, a form of high-energy radiation that can damage our health. Radon daughters will stick to just about anything they encounter, so they are easily collected by drawing air through a dusting cloth with an ordinary fan. After collecting the daughters for about an hour or two, the radiation being emitted from the cloth due to the further decay of the collected radioactive isotopes can be measured with a simple ionization chamber made from an empty coffee can, a single Darlington transistor, and a digital voltmeter. The deceivingly simple ion chamber is quite sensitive and can detect radon daughters in buildings with radon concentrations below the â€Å"action level† recommended by health authorities. A simple ionization chamber is nothing more than a metal can with a wire inside. When a radioactive particle passes through the air in the chamber, many of the molecules of air are ionized, having electrons knocked loose from the outer atomic shells. Applying a positive voltage on the outer can relative to the internal wire, causes these ions to be attracted to the wire and the free electrons to be attracted to the interior wall of the can. This movement of charge is a tiny current that may be amplified to detect the rate at which ions are being generated, and thereby the rate that radioactive particles are passing through the can. The chamber will be detecting mostly beta  particles. BACKGROUND OF THE STUDY Copper is an essential element for all known living organisms, including humans. You need a small amount of copper in your diet to stay healthy. On average, most people will eat and drink about 1,000 micrograms ( ÃŽ ¼g) of copper per day—drinking water normally contributes approximately 150 ÃŽ ¼g per day. Levels of copper found naturally in ground water and surface water are typically very low—about 4 ÃŽ ¼g of copper in one liter (L) of water or less—however, drinking water may contain higher levels of copper, usually as a result of flowing through copper pipes. High levels of copper can occur if water that is corrosive comes in contact with copper plumbing and copper-containing fixtures. Many factors can make water corrosive for copper pipes: dissolved salts and minerals, bacteria, and suspended solids, such as sand, sediment, and rust. The level of copper in drinking water increases with the corrosivity of the water and the length of time it remains in contact with the plumbing. If the copper level gets too high, the water may have a metallic taste and you might notice blue or blue-green stains around sinks and plumbing fixtures. It will be highest in the morning because the water will have been exposed to the pipes overnight. If you are being served by a public water system, the owner of the utility will have results of  copper sampling, which is a process that has been done in parts of the water-distribution system. In this chemistry science fair project, you will investigate another possible factor in making water corrosive for copper — the pH of the water. You will test the theory that acidic water is more corrosive for copper pipes than non-acidic water. In the procedure, dingy copper pennies will be placed in either plain water or in water with acetic acid (vinegar). You may know that newly minted pennies have bright, shinny copper but over time the copper and air react and the pennies build up a layer of copper oxide on them. The copper oxide is the dull, dark coloration on well-used pennies. In this experiment, if the water is corrosive enough to strip off the copper oxide then you will see the progress of the reaction by watching the pennies go from dull and dingy to bright and shiny. The pennies get shiny because the copper oxide is being stripped off by a reaction, which results in increasing levels of copper in the liquid. Unfortunately, water that is corrosive slowly eats away at the pure copper, as well as at the copper oxide. For houses with corrosive water systems, this can result in elevated levels of copper in the drinking water. On a purely practical level, houses with corrosive water systems might find that their copper pipes are springing leaks, and that the whole house needs to be re-piped with plastic pipes! To measure the amount of copper present in the solutions that are used to clean the pennies, you will perform a color-based chemical test. The chemicals for the test are contained in a small tablet, which is dissolved in water. When the tablet is dissolved, the solution turns reddish-orange. If no copper (or very small amounts of copper) is present, the solution remains reddish-orange. If copper is present, the solution will turn blue.

Teddy Roosevelt essays

Teddy Roosevelt essays Theodore Roosevelt, the second of four children, was born in New York, New York on October 27, 1858. He was part Dutch, English, Welsh, Scottish, Irish, French, and German. Because of Roosevelts poor health, he suffered from asthma and defective vision. He had great energy, curiosity, and determination like his father. Teedie as his family would call him, loved books and the outdoors. He combined these interests into nature study. When he was ten and again when he was fourteen, Teedie went with his family on yearlong trips to Europe and the Middle East. His father built a gymnasium in his house so he could exercise regularly. His father said that he would need a strong body to give his mind a chance to develop fully. Over time, Roosevelt overcame his asthma and built up unusual physical strength. On October 27, 1880, Roosevelt married Alice Hathaway. They were a happily married couple for about 3 years until she died on February 13, 1884, following a baby girl the next day named, Alice Roosevelts mother died on the same day as Theodores wife. Baby Alice survived, and was subsequently married in a lavish White House ceremony to Nicholas Longworth. Meanwhile, Roosevelt married his childhood sweetheart, Edith Kermit Carow, in London. She was an intelligent, sensitive and cultivated woman. Resignedly, she accepted many of her husbands most disruptive decisions, such as his break with the Republican Party in 1912. She gave four sons-Theodore, Jr.; Archibals; Quentin; and a daughrt Ethel. The energetic kids in the Roosevelt family were the liveliest group of children to live in the White House. September 14, 1901 Roosevelt took the oath of office at Buffalo and became the twenty-sixth President of the United States. At age 42, he was the youngest man to hold that office. In May of 1902, Crater Lake National Park was established. Other National Parks established by Roosevelt are Windy Cave National Pa...

Accepting Yourself essays

Accepting Yourself essays It is easy in the world to live after the worlds opinion; it is easy in solitude to live after our own; but the great man is he who in the midst of the crowd keeps with perfect sweetness the independence of the solitude. That was once said by Emerson in his Self-Reliance essay. The phrase above states that its easy to forget who you are when you are in among a crowd of people or your friends, but the one who can be him or herself when they are around a crowd is the real you. I was transferred from a work farm out in the south to the Oregon psychiatric hospital all of the other patients in the ward notice something different about him. I caused most of the disturbance during the night calling the nurses and the aides inappropriate names. I placed many bets that I could get transferred out of that ward just as fast as I did the one before that, and the one before that. There was this one nurse who I couldnt stand at all so I bet I could make her go off on me by the end of the week, for sure I could get kicked out then. I didnt like any of the other men in my ward, they were very different than me. They acted as if they were in there and havent did a thing wrong in their entire life and act as if they were fine. I know I have done wrong and I know that I will have to pay the consequences now, I learned to accept thats who I am and I am not willing to change for anyone. The best solution I could have done was when I was myself, I do not regret one thing I said or one thing I did while I was in the ward. I was myself, I was who I wanted to be, I did what I wanted when I was around everyone else. I had many people who didnt like me and many people said Well, Randle if you want them to think you are cured, you better change or you are never going to get out here. I did not care if I got out or not, that is who I was. The other men in the ward learned to accept m ...