Science
The scientific world contains a wealth of knowledge that enables mankind to live the way it does. EssaysForStudent.com can help you close the gaps in your knowledge.
4,609 Essays on Science. Documents 4,591 - 4,609
-
X-Ray Fundamentals
Basic physics of X-ray imaging Carl A Carlsson and Gudrun Alm Carlsson Department of Radiation Physics Faculty of Health Sciences Linköping university Sweden REPORT LiH-RAD-R-008 Second edition 1996 TABLE OF CONTENTS 1. Introduction .........3 2. The physics of the X-ray source: the X-ray tube .........3 3. The energy spectrum of X-rays .........7 4. The interactions of X-rays with matter .........12 5. Contrast .........19 6. Energy absorption of X-rays .........22 7. Stochastics in the X-ray image
Rating:Essay Length: 4,072 Words / 17 PagesSubmitted: November 13, 2009 -
Xenadrine
Xenadrine Xenadrine is one of the more popular and controversial dietary supplements on the market today. As you read this paper, you will come to know that there are two different types, Xenadrine RFA-1 and Xenadrine EFX. These two might not seem that different, but they are in a way that your life may depend on it. Xenadrine, made by the New Jersey company Cytodyne Technologies, has quickly grown to be one of the
Rating:Essay Length: 759 Words / 4 PagesSubmitted: March 26, 2010 -
Xeno Transplantation
With approximately 48,000 individuals on the waiting list for organ transplants and only about 4,835 people donating their organs after death each year, there are around 3,000 yearly deaths for those who do not have these organs available to the them (1). Consequently, medicine has turned to an additional yet somewhat controversial source for organ donations: animals. The term xenotransplantation is defined as "the transplantation of living organs, cells or tissue from one species to
Rating:Essay Length: 1,160 Words / 5 PagesSubmitted: December 6, 2009 -
Xyy Syndrome
XYY Syndrome XYY Syndrome is a rare genetic disorder which affects males due to an extra Y chromosome. Healthy males have 46 chromosomes including one X and one Y chromosome. Men with XYY syndrome have 47 chromosomes, two of which are Y chromosomes. It is not known why the extra Y chromosome occurs. The disorder is present at birth and is estimated to occur in one out of every one thousand live births. In very
Rating:Essay Length: 470 Words / 2 PagesSubmitted: December 23, 2009 -
Xyy Syndrome
XYY Syndrome is a rare genetic disorder which affects males due to an extra Y chromosome. Healthy males have 46 chromosomes including one X and one Y chromosome. Men with XYY syndrome have 47 chromosomes, two of which are Y chromosomes. It is not known why the extra Y chromosome occurs. The disorder is present at birth and is estimated to occur in one out of every one thousand live births. In very rare instances,
Rating:Essay Length: 400 Words / 2 PagesSubmitted: March 19, 2010 -
Xyy Syndrome
XYY Syndrome is a rare genetic disorder which affects males due to an extra Y chromosome. Healthy males have 46 chromosomes including one X and one Y chromosome. Men with XYY syndrome have 47 chromosomes, two of which are Y chromosomes. It is not known why the extra Y chromosome occurs. The disorder is present at birth and is estimated to occur in one out of every one thousand live births. In very rare instances,
Rating:Essay Length: 391 Words / 2 PagesSubmitted: May 23, 2010 -
Yak Lab
Yak Lab Natural selection is the process by which favorable heritable traits become more common in successive generations of a population of reproducing organisms, and unfavorable heritable traits become less common. Natural selection acts on the phenotype, or the observable characteristics of an organism, such that individuals with favorable phenotypes are more likely to survive and reproduce than those with less favorable phenotypes. If all the offspring that organisms can produce were to survive and
Rating:Essay Length: 612 Words / 3 PagesSubmitted: January 18, 2010 -
Yeast
Purpose: Respiration is an important part of the global carbon cycle. To get energy, organisms (plants, bacteria, animals, yeast, etc.) respire. That means they internally burn sugars back into carbon dioxide gas which is then released into the atmosphere. We can use yeast to experiment with and explore this process. Human activities that change conditions in the air, water and land affect other organisms. We can add different chemicals to the yeast and determine what
Rating:Essay Length: 1,070 Words / 5 PagesSubmitted: December 8, 2009 -
Yeast Respiration
Biology-Respiration-Rate of Yeast Respiration Aim: An investigation to find out how temperature affects the rate of yeast respiration. Variables: Fixed variables: Through out the investigation I will keep the amount of yeast/glucose solution the same (50 ml). Also the amount of time I will run the experiment for at each reading will remain constant at 1 minute. The one other thing I will keep the same is the concentration of the Glucose as we are
Rating:Essay Length: 2,285 Words / 10 PagesSubmitted: December 21, 2009 -
Yersinia Pestis - the Bubonic Plague Epidemic
Yersinia pestis: “The Bubonic Plague Epidemic” The bubonic plague (also known as the “Black Death”) is one of the deadliest epidemics, eventually turning pandemic, in human history. The bubonic plague began in Europe around 1347 and lasted until 1353. The result of this epidemic killed more than 25 million people. At the time, this was more than a quarter of Europe’s population. The pathogen causing this deadly, historic disease is known as Yersinia pestis. Y.
Rating:Essay Length: 650 Words / 3 PagesSubmitted: November 13, 2009 -
Yield Lab
Abstract: All the materials were measured and weighed. It was found in the experiment that the yield of copper hydroxide in 40%. Introduction: The copper (II) sulphate is then placed in 100 mL of distilled water. Then 20 mL of CuSO4 is measured and placed 100 mL of distilled water. This can later be weighed to determine the mol of CuSO4 and the mol/L concentration. Then this was used to find out how many mL
Rating:Essay Length: 908 Words / 4 PagesSubmitted: January 22, 2010 -
Yoke Mechaism
Background of Study In this laboratory we will investigate the kinematics of some simple mechanisms used to convert rotary motion into oscillating linear motion and vice-versa. Pure simple harmonic motion is produced by the Scotch Yoke mechanism when driven by an eccentric or crank. Scotch Yoke takes a revolution per minute per minute and converts it to a linear velocity. It can be shown that: X = r ( 1 – cos ) By differentiation:
Rating:Essay Length: 488 Words / 2 PagesSubmitted: April 19, 2015 -
You Can Make a Difference in Preventing Marine Engine Pollution
You Can Make a Difference In Preventing Marine Engine Pollution Currently 12 million marine engines are operated in the United States. These marine engines are among the highest contributors of hydrocarbons (HC) and oxides of nitrogen (NOx) emissions in many areas of the country. HC and NOx produce ground-level ozone, which irritates the respiratory system causing chest pain and lung inflammation. Ozone can also aggravate existing respiratory conditions such as asthma. Boaters can join many
Rating:Essay Length: 4,115 Words / 17 PagesSubmitted: May 22, 2010 -
Zebra Fish and the Affect of Uv Light on Their Development
Zebra Fish and the Affect of UV Light on their Development The zebra fish are small striped fish that usually develop in about a week. They begin as a single cell embryo to a multi-cellular organism. In an experiment I tested how UV light would effect the development of the zebra fish. My hypothesis is that with the UV light on them they would increase development. In the beginning of the experiment there were three
Rating:Essay Length: 745 Words / 3 PagesSubmitted: December 5, 2009 -
Zinc Oxide
Zinc oxide in a mixture with a about 0.5% iron(III) oxide (Fe2O3) is called calamine and is used in calamine lotion. There are also two minerals, smithsonite and hemimorphite, which have been called calamine historically (see: calamine (mineral). Zinc peroxide, ZnO2 .Ѕ H2O, is a white to yellow powder that is used in antiseptic ointments. Zinc white is used as a pigment in paints and is more opaque than lithopone, but less opaque than titanium
Rating:Essay Length: 392 Words / 2 PagesSubmitted: January 14, 2010 -
Zoology
Zoology We live in a world full of varieties in Life Science. This is what makes us complex to this day. I decided to write about the Life Science of Zoology, which is the study of biology dealing with animals. In other words it can also be described as the science of animal life. It is the teaching of involving research of the animal kingdom and life. It shows us the behavior, characteristics, anatomy and
Rating:Essay Length: 452 Words / 2 PagesSubmitted: November 22, 2017 -
Сhildrеn Physiсаl Асtivity and Оbеsity in Qatar
Сhildrеn Physiсаl Асtivity and Оbеsity in Qatar Student’s Name Institution Course Instructor’s Name Date The fast developing countries in the world are faced with a great problem. The problem, although may appear to have far-fetched evidence is real. It is related to the reduced levels of children physical activity in these countries. The escalating rates of obesity and overweight in the developing countries in the last twenty-five years has been alarming. The trend, previously
Rating:Essay Length: 1,366 Words / 6 PagesSubmitted: September 3, 2014 -
“caregiving Provides the Morale and Wellness of the Elderly “
Introduction: Caregiving among the adult population is a popular trend in the twenty-first century. Now that aging population is increasing in its proportion family members entrust their elder’s the caregivers. Since part of the caregiver’s task is to take account the elder’s morale and well-being. In becoming an effective caregiver one should be knowledgeable, patient and compassionate. They should also assume the role of being a healthcare provider as well as to become the emotional
Rating:Essay Length: 2,076 Words / 9 PagesSubmitted: November 17, 2009 -
“surely You're Joking Mr.Feynman...”
It is hard not to enjoy this author. Richard Feynman is an extremely curious character with a lot of time on his hands. He obviously loved to explore the science world as an art. He won the Nobel Prize in 1965 for physics and was one of the greatest physicists of all time. Within the few chapters and pages that I have read, Richard Feynman was definitely a man with a huge sense of adventure
Rating:Essay Length: 1,208 Words / 5 PagesSubmitted: December 30, 2009