- Free Essays, Term Papers & Book Notes


The scientific world contains a wealth of knowledge that enables mankind to live the way it does. can help you close the gaps in your knowledge.

4,558 Essays on Science. Documents 1,471 - 1,500

  • Enzymes Coursework

    Enzymes Coursework

    ENZYME INVESTIGATION Planning Introduction: An Enzyme is any one of many specialised organic substances, composed of polymers of amino acids, that act as catalysts to regulate the speed of the many chemical reactions involved in the metabolism of living organisms. Those enzymes identified now number more than 700. Enzymes are classified into several broad categories, such as hydrolytic, oxidising, and reducing, depending on the type of reaction they control. Hydrolytic enzymes accelerate reactions in which

    Essay Length: 1,854 Words / 8 Pages
    Submitted: May 1, 2010 By: Edward
  • Enzymes Essay

    Enzymes Essay

    Enzymes Enzymes are the sparks that start the essential chemical reactions our bodies need to live. They are necessary for digesting food, for stimulating the brain, for providing cellular energy, and for repairing all tissues, organs, and cells. There are three types of enzymes: metabolic enzymes, digestive enzymes, and food enzymes. Metabolic enzymes catalyse, or spark, the reactions within the cells. The body's organs, tissues and cells are run by metabolic enzymes. Without them our

    Essay Length: 722 Words / 3 Pages
    Submitted: November 14, 2009 By: Steve
  • Ephedra


    Until recently no herb have been researched as heavily and extensively as ephedra. Ephedra has been broadcasted all over the news in the past few years. But it hasn’t been all good news that has been portrayed, its been the deadly effects of the herb that has caught the public’s eye. More than half the American population is obese, so it's no surprise weight loss supplements are popular. What is surprising is that these

    Essay Length: 344 Words / 2 Pages
    Submitted: December 20, 2009 By: Andrew
  • Ephedrine


    There are great health and social pressures in our society to be thin. Experts agree that combining a healthy diet with regular exercise is the best way to lose weight. However, hundreds of different nutritional supplements are readily available on the market claiming to enhance physical performance and help with weight loss. These products are readily purchased by consumers looking for fast results without much concern or knowledge of the possible side effects or dangers.

    Essay Length: 3,286 Words / 14 Pages
    Submitted: January 17, 2010 By: Jessica
  • Epidemic Diseases

    Epidemic Diseases

    Of the many diseases spread by insects, none are actually caused by the insects themselves but by other organisms passed on when they feed or bite. Insects are capable of spreading diseases caused by many different types of microorganisms including bacteria, viruses, protozoan and others. Mosquitoes have earned the title of "the most deadly creature on earth." This is due to the fact that they spread serious epidemic diseases such as Malaria, Yellow Fever, African

    Essay Length: 2,593 Words / 11 Pages
    Submitted: November 29, 2009 By: Mike
  • Epidemics Throughout History

    Epidemics Throughout History

    Malaria A thin-film Giemsa stained micrograph of ring-forms, and gametocytes of Plasmodium falciparum. Brief Overview • Malaria is one of the most common infectious diseases and an enormous public-health problem. • Malaria is a vector-borne infectious disease that is widespread in tropical and subtropical regions • It infects between 300 and 500 million people every year and causes between one and three million deaths annually, mostly among young children in Sub-Saharan Africa. • The disease

    Essay Length: 301 Words / 2 Pages
    Submitted: November 30, 2009 By: Fatih
  • Epidemiology Article Summary

    Epidemiology Article Summary

    Epidemiology Health Article Summary #2 Scientists at the UT Southwestern Medical Center in Dallas recently completed human testing on a ricin vaccine. Ricin is a toxin extracted from castor beans and is deadly when eaten, breathed or injected. Small amounts can cause organ failure and even death. The primary concern regarding ricin is its ease of availability, resulting in its biological agent classification. It could easily be used as a terrorist weapon and has in

    Essay Length: 318 Words / 2 Pages
    Submitted: November 19, 2009 By: Jack
  • Epilepsy in Children

    Epilepsy in Children

    Epilepsy in Children Schuyler Wilson Nursing Care Through the Lifespan III June 28, 2005 Epilepsy is the name for a condition of recurrent seizures where no underlying cause can be determined. Seizures occur as a result of abrupt, explosive, unorganized discharges of cerebral neurons. This causes a sudden alteration in brain function involving sensory, motor, autonomic and/or psychic clinical manifestations. Epilepsy can be a result of other conditions including: § Genetic predisposition § Brain

    Essay Length: 1,130 Words / 5 Pages
    Submitted: November 20, 2009 By: Jack
  • Equilibrios En Solucion Acuosa Y Volumetria Acido-Base

    Equilibrios En Solucion Acuosa Y Volumetria Acido-Base

    EQUILIBRIOS EN SOLUCION ACUOSA Y VOLUMETRIA ACIDO-BASE Acidos polipróticos A un ácido que libera únicamente un protón se le llama ácido monoprótico. El ácido carbónico, H2CO3, libera dos iones hidrógeno y se le llama ácido diprótico; el H3PO4 (ácido fosfórico) es un ácido triprótico, etc. En general, a los ácidos que liberan dos o más protones se les llama ácidos polipróticos. El ácido fosfórico y algunos aminoácidos son ácidos polipróticos importantes. Los fosfatos participan como

    Essay Length: 2,817 Words / 12 Pages
    Submitted: June 1, 2013 By: Eloiza
  • Er Nursing

    Er Nursing

    Job Essay: E.R. Nurse Emergency nursing is a dynamic, fast-paced field that gives you the opportunity to treat a wide range of patients with an even wider range of illnesses, conditions and traumas. ER nurses have to be able to think on their feet, work well with their teammates and be ready for just about anything. ER nurses are highly trained in their specialty, and there are lots of certifications available. At a minimum,

    Essay Length: 363 Words / 2 Pages
    Submitted: January 11, 2010 By: Jack
  • Ertt


    List the molecular weight, melting point, boiling point, density, solubility, and hazards of all pertinent chemicals used in the experiment. You can find this information in the CRC Handbook of Chemistry and Physics. (We have this book at school, and a CD-ROM version as well.) Or, you can find the information on the Internet (see: Hazard and Physical Data for Compounds page). is an excellent site to find this data. The physical data are

    Essay Length: 578 Words / 3 Pages
    Submitted: May 13, 2011 By: lkk25598
  • Escherichia Coli 0157:h7

    Escherichia Coli 0157:h7

    Escherichia coli 0157:H7 OR (E. coli) is a food born pathogen that can cause serious illness or if left untreated can cause death. One of the obvious symptoms of E. coli is bloody diarrhea although not all forms of E coli have the same symptoms. The main toxins all strains of E. coli produce are called shiga toxins, the toxins alone are not able to make E. coli pathogenic it needs the presence of other

    Essay Length: 563 Words / 3 Pages
    Submitted: December 15, 2009 By: Victor
  • Escherichia Coli and Staphylococcus Albus

    Escherichia Coli and Staphylococcus Albus

    Escherichia coli and Staphylococcus albus Some bacteria’s require a certain amount of light in order to function properly and there fore survive. Escherichia coli is found in the gut and intestines of mammals. Staphylococcus albus is generally a skin dwelling bacteria Aim: To test whether the amount and type of light that the bacteria’s E.coli and S.albus are subject to causes changes in their growth rates and habits. To test whether the growth rates and

    Essay Length: 518 Words / 3 Pages
    Submitted: March 22, 2010 By: Edward
  • Essay on Oxygen Debt and the Beneficial Effects of Exercise

    Essay on Oxygen Debt and the Beneficial Effects of Exercise

    During muscular exercise, blood vessels in the muscles dilate and blood flow is increased in order to increase the available oxygen supply, to allow the muscles required to function properly. Up to a point, the available oxygen is sufficient to meet the energy needs of the body. However, when muscular exertion is very great, oxygen cannot be supplied to muscle fibres fast enough, and the aerobic breakdown of pyruvic acid cannot produce all the ATP

    Essay Length: 3,197 Words / 13 Pages
    Submitted: January 28, 2010 By: Mike
  • Establishments of Professor James Quintiere ( Fire Researcher)

    Establishments of Professor James Quintiere ( Fire Researcher)

    Table of contents: Table of contents: 1 Abstract: 2 Acknowledgment: 2 Introduction 3 Selected Papers: 4 Flash over and instabilities in fire behaviour. 4 Estimating room temperatures and likelihood of flashover using fire test data correlations 6 Conclusion 9 References 10 Appendix I 12 Abstract: The contribution of Professor J. G. Quintiere into the field of fire protection is introduced and discussed, and as it is difficult to evaluate his whole contribution into the field

    Essay Length: 271 Words / 2 Pages
    Submitted: April 18, 2010 By: Yan
  • Ethanol


    Ethanol Ethanol is easily soluble in water in all proportions with a slight overall decrease in volume when the two are mixed. Absolute ethanol and 95% ethanol are themselves good solvents, somewhat less polar than water and used in perfumes, paints and tinctures. Other proportions of ethanol with water or other solvents can also be used as a solvent. Alcoholic drinks have a large variety of tastes because various flavor compounds are dissolved during brewing.

    Essay Length: 564 Words / 3 Pages
    Submitted: December 31, 2009 By: Victor
  • Ethanol


    Today, renewable energy sources are commonly used to replace fossil fuels due to the lacking of oil, gas, etc. An alternative energy source is ethanol (C2H5OH). It is an alcohol fuel manufactured by fermentation and distillation of crops that are high with starch and sugar, such as grains, sugarcane (most commonly used), corn, and fruit. Other names for ethanol are ethyl alcohol, drinking alcohol, and grain alcohol. It can also be made from trees, grasses,

    Essay Length: 351 Words / 2 Pages
    Submitted: April 24, 2010 By: Mike
  • Ether Is Dipole

    Ether Is Dipole

    Ether is dipole Cheng There are four different types of force in nature: electric force, gravitational force, big gravitational force, and magnetic force. These four different types of forces and the entire physical phenomenon in these forces are related to the characteristics of the dipole moment of the smallest unit energy particle Ў°Tei0/etherЎ±. This smallest unit energy particle Tei0/ether is continuously radiated from all substances. From study in radiation of black body, it indicated that

    Essay Length: 1,763 Words / 8 Pages
    Submitted: December 8, 2009 By: Mike
  • Ethernet


    Ethernet ist eine rahmenbasierte Computer-Vernetzungstechnologie fьr lokale Netze (LANs). Sie definiert Kabeltypen und Signalisierung fьr die Bitьbertragungsschicht sowie Paketformate und Protokolle fьr die Medienzugriffskontrolle (Media Access Control, MAC)/Sicherungsschicht des OSI-Modells. Ethernet ist weitestgehend in der IEEE-Norm 802.3 standardisiert. Es wurde ab den 1990ern zur meistverwendeten LAN-Technologie und hat alle anderen LAN-Standards wie Token Ring, FDDI und ARCNET verdrдngt. Ethernet kann die Basis fьr Netzwerkprotokolle, wie z.B. TCP/IP, AppleTalk oder DECnet bilden. Ethernet mit TCP/IP-Protokollstapel Anwendung

    Essay Length: 253 Words / 2 Pages
    Submitted: April 22, 2010 By: Anna
  • Ethical Dilemmas

    Ethical Dilemmas

    There are many ethical dilemmas/cases throughout history, today I would like to address two issues/dilemmas that I believe have impacted and helped reshape our stances upon medical ethics. The first issue in which I would like to address to Physician Assisted Suicide or sometimes referred to as PAS. Many people have varied viewpoints on this topics ranging from patient suffering, patient rights to patient-physician trust. This point has been battled over and over again by

    Essay Length: 759 Words / 4 Pages
    Submitted: March 22, 2010 By: Mikki
  • Ethics


    Cloning, is it the thing of the future? Or is it a start of a new generation? To some, cloning could give back a life. A life of fun, happiness, and freedom. For others it could mean destruction, evil, or power. Throughout this paper, you the reader, should get a better concept of cloning, it's ethics, the pro's and con's, and the concerns it has brought up. You will hear the good of what cloning

    Essay Length: 1,807 Words / 8 Pages
    Submitted: May 30, 2010 By: Yan
  • Ethics and Policies

    Ethics and Policies

    Ethics and Policies Ethics definition Ethics in managements is concerned with those parts of organisational, operational, occupational and professional conduct that relate to absolute standards and moral principals. More generally, it is concerned with human character and conduct, the distinction between right and wrong, and the absolute duties and obligation that exist in all situation. It is more likely that consumer to use the organisation that they can trust and have confidence in it.

    Essay Length: 2,825 Words / 12 Pages
    Submitted: January 10, 2010 By: Stenly
  • Ethics of Organ Transplants

    Ethics of Organ Transplants

    An organ transplant is the moving of a whole or partial organ from one body to another for the purpose of replacing the recipient’s failing or damaged organ. Organ donors can be living or deceased. The sources of organ transplants can be from individuals over the age of 18 who indicate their desire to be an organ donor by signing a donor card or telling their family members. Relatives can also donate a deceased family

    Essay Length: 650 Words / 3 Pages
    Submitted: May 28, 2010 By: Jack
  • Ethics of Xenotransplantion

    Ethics of Xenotransplantion

    With the transplant waiting list growing every day because of a lack of human organ donors, there is much talk of xenotransplantation (the use of animal organs and tissues for transplantation in human) among the scientific community. With the many technological and medical advances, it is quite possible to use organs, or parts of organs to save a life. There have been debates back and forth whether or not this is considered an ethical

    Essay Length: 612 Words / 3 Pages
    Submitted: February 27, 2010 By: Jessica
  • Ethology - a Study in Animal Behavior and the Complexity of Their Action

    Ethology - a Study in Animal Behavior and the Complexity of Their Action

    Ethology: A Study in Animal Behavior and the Complexity of Their Action A Study in Animal Behavior Hierarchy Among Animal Species Ethology, the study of animal behavior is still a new frontier for scientists (Freedman, 1970). Ethology, a combination of evolution, ecology, physiology, genetics and psychology, has just come about within the last two decades (Raven, 1999). Animals are a vital component in the history of the world. For instance, the Bible mentions some 100

    Essay Length: 2,189 Words / 9 Pages
    Submitted: April 10, 2010 By: Max
  • Euclid


    Euclid also known as Euclid of Alexandria, was a Greek mathematician who flourished in Alexandria, Egypt, almost certainly during the reign of Ptolemy 1 between 323 and 283 BC. Neither the year nor the place of his birth has been established, and the circumstances of his death remain a mystery. Little is known about Euclid other than his writings, the little information known about Euclid comes from commentaries by Proclus and Pappus of Alexandria. Euclid

    Essay Length: 342 Words / 2 Pages
    Submitted: May 2, 2010 By: Tasha
  • Euclid of Alexandria

    Euclid of Alexandria

    Euclid Of Alexandria may be the best-known mathematician of the world, he is best known for his work on mathematics The Elements. The fact that his work has survived so long, 2000 years in fact, is a tribute to his mathematical genius, however very little of him is known. Three theories abound as to the true nature of this historical figure. Not all historians agree that Euclid was in fact a historical figure, some argue

    Essay Length: 557 Words / 3 Pages
    Submitted: April 7, 2010 By: Andrew
  • Eugenics


    The eugenics movement began in the 20th century by a man named Francis Galton. As the cousin of Charles Darwin, Galton believed that eugenics was a moral philosophy to improve humanity by encouraging the ablest and healthiest people to have more children (Carlson). This Galtonian ideal of eugenics is often thought of as positive eugenics. Eugenics can be defined as the outgrowth of human heredity aimed at “improving” the quality of the human stock (Allen

    Essay Length: 1,952 Words / 8 Pages
    Submitted: December 8, 2009 By: Mikki
  • Eugleeena


    A. Introduction Phototaxis is the movement of an organism towards or away from a light source. In this experiment the phototaxis of the live specimen, Euglena will be observed. The purpose is to find whether the Euglena will present negative or positive phototaxis when exposed to a beam of light after being subjected to darkness. Would the chloroplasts in the Euglena have an effect on the specimen’s phototaxis and overall nature or movement? By observing

    Essay Length: 287 Words / 2 Pages
    Submitted: February 20, 2010 By: Top
  • Euthanaisa


    Euthanasia I became curious about this topic a couple of years back, my mother and I were watching 60 minutes and heard something about legalized killings. It caught our attention immediately, so we watched the excerpt about Dr. Kevorkian. We saw the process of euthanasia, it didn’t seem a too terrible way to die; compared to the suffering of the patients undergoing euthanasia. Then the topic came up during a random discussion while talking to

    Essay Length: 2,118 Words / 9 Pages
    Submitted: January 2, 2010 By: Tasha
Advanced Search