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4,609 Essays on Science. Documents 1,471 - 1,500

  • Environmental Issues in China

    Environmental Issues in China

    As our population is growing, when we are taking it for granted to ask the nature for resource we want, environmental protection is becoming more and more important and necessary. Water protection is especially urgent now. We can see the water pollution is becoming worse. In this essay, I am going to talk about the recent situation of the water pollution, the bad effects of it and some ways help to solve the problem as

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    Essay Length: 1,194 Words / 5 Pages
    Submitted: March 5, 2010 By: Max
  • Environmental Threats to Southeast Asia

    Environmental Threats to Southeast Asia

    Environmental Threats to Southeast Asia Southeast Asia has been a location ripe for economic gain and has been looked upon by the western world with a certain gleam in their eye. Ever since the days of Marco Polo and Columbus there has been a desire to profit from the abundant and diverse resources of the Indies. Today, that desire has led this region of the world into a perilous downward spiral that could jeopardize the

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    Essay Length: 1,585 Words / 7 Pages
    Submitted: January 29, 2010 By: Mike
  • Environmental Values

    Environmental Values

    The word "value" means worth. It also refers to an ethical precept on which one base their behavior. Values are shaped by the culture in which individuals live and by our experiences. However, there are values that are held high by most cultures. These include fairness and justice, compassion and charity, duties and rights, human species survival and human well-being. Environmental Values brings together contributions from philosophy, economics, politics, sociology, geography, anthropology, ecology and

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    Essay Length: 1,366 Words / 6 Pages
    Submitted: March 14, 2010 By: Mikki
  • Envs200 Lead Research

    Envs200 Lead Research

    Jenelle Dennis Joanne Dittersdorf Envs 200:001 10 December 2018 I choose to talk about lead in children and in adults and what causes lead to get into your blood. Lead is a natural thing found deep in the ground, it doesn’t always come in large amounts. Lead can and will start in small portions in or along with other elements. For example, copper zinc per silver. You may not even know but lead is all

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    Essay Length: 1,076 Words / 5 Pages
    Submitted: April 29, 2019 By: jenelle dennis
  • Envst

    Envst

    Community Involvement #1 Growing up, my family was known for being as environmentally friendly as possible. One of my jobs at home was to make sure to bring out anything recyclable and sort the recyclables into their proper place. We found so much to be recyclable, if you were to drive down our street before the day when recycling was collected, you would guess there were 7-8 people living in our 4 person home. When

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    Essay Length: 275 Words / 2 Pages
    Submitted: March 27, 2010 By: Max
  • Enzymatic Activity

    Enzymatic Activity

    Abstract: The objective of this lab was to determine the effects of certain variables on enzymatic activity and to get a quantitative feel for the effectiveness of a certain enzyme, in this case peroxidase obtained from potatoes. In order to do this, we conducted experiments in which the effects of boiling and inhibitors were examined by comparing normal enzymes to those affected by the factors being tested. Using a spectrophotometer, we analyzed the absorbance levels

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    Essay Length: 1,234 Words / 5 Pages
    Submitted: June 1, 2010 By: Anna
  • Enzyme

    Enzyme

    Examination of the Effects of Inhibitory and Non-Inhibitory Competition, Enzyme-Substrate Concentration, Along with Varying Temperature and pH-Balanced Environments on the Enzyme-Catalyzed Reaction of pNPP Abstract: Introduction: Many of the chemical reactions, which take place in in living things are controlled by enzymes. In such cases, the enzyme is a protein in the cell which lowers the activation energy of a catalyzed reaction, which serves to increase the rate of the reaction. Alkaline phosphatase is made

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    Essay Length: 1,882 Words / 8 Pages
    Submitted: December 5, 2009 By: Victor
  • Enzyme Lab

    Enzyme Lab

    Introduction Enzymes are the catalysts of biochemical reactions that are produced in the cell. It changes the rate of reaction but is not consumed by it. The reaction produced breaks up substrate molecules, and afterwarc, the enzyme is free to move on to another substrate molecule. The substrate molecule is the original molecule that the enzyme attaches to it active site where the substrate is changed. There are several objectives to this lab. They

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    Essay Length: 1,123 Words / 5 Pages
    Submitted: May 20, 2010 By: Tommy
  • Enzyme Lab Report

    Enzyme Lab Report

    AP Biology Lab: Catalase (Enzymes) Abstract In this laboratory exercise, studies of enzyme catalase, which accelerates the breakdown of hydrogen peroxide into water and oxygen. The purpose was to isolate catalase from starch and measure the rate of activity under different conditions. The laboratory was also conducted in association with a second laboratory that measured the effects of an inhibitor on the enzymes. Changes in temperature and pH along with Substrate Concentration and Enzyme

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    Essay Length: 838 Words / 4 Pages
    Submitted: December 16, 2009 By: Monika
  • Enzyme Lab Report

    Enzyme Lab Report

    Introduction: The purpose of this lab was to measure the extent of enzyme reaction on given substrates by means of color change. The reaction followed is given below: Tyrosinase„і Enzyme Pyrocatechol Hydroxyquinone Oxidation/Reduction Pink „і Brown E+S + [ES] = E+P Enzyme Reaction Hypothesis: If there is an increase in enzyme concentration, an increase in reaction temperature, or an increase in buffer pH, then greater intensity in a given reaction will be experienced, resulting in

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    Essay Length: 657 Words / 3 Pages
    Submitted: April 10, 2010 By: Jack
  • Enzyme Lab Using Jello

    Enzyme Lab Using Jello

    Enzyme Lab Using Jello INTRODUCTION: Enzymes are known as protein catalysts. The name protein catalyst suggests that most enzymes are made of proteins. A catalyst is a substance that speeds up chemical reactions without being consumed in the process. (Giuseppe, M 2002, p.69). After a reaction has been catalyzed, the catalyst can be used again to catalyze the same reaction. Enzymes reduce the activation energy (minimal energy) it takes for a reaction to take place.

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    Essay Length: 1,296 Words / 6 Pages
    Submitted: January 11, 2010 By: Tommy
  • Enzyme Reaction of Different Yeast Substances

    Enzyme Reaction of Different Yeast Substances

    Title: Enzyme Reaction of Different Yeast Substances Introduction: In this lab, my group was able to learn and understand the process of cellular respiration. Our goal in this lab was to find out which solution reacted most with the enzymes in the yeast. The effects of inhibitors on enzymes and the activity of yeast on different solutions were measured in this lab. In lecture, we learned that fermentation enables some cells to produce ATP without

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    Essay Length: 993 Words / 4 Pages
    Submitted: January 27, 2010 By: Top
  • Enzyme Regulation

    Enzyme Regulation

    Enzyme Regulation Enzymes allow many chemical reactions to occur within the homeostasis constraints of a living system. Enzymes function as organic catalysts. A catalyst is a chemical involved in, but not changed by, a chemical reaction. Many enzymes function by lowering the activation energy of reactions. By bringing the reactants closer together, chemical bonds may be weakened and reactions will proceed faster than without the catalyst. Enzymes are proteins, the functioning of the enzyme

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    Essay Length: 1,690 Words / 7 Pages
    Submitted: December 27, 2009 By: Monika
  • Enzymes

    Enzymes

    Enzymes are biological catalysts that speed up the rate of a chemical reaction. Being a catalyst, enzymes are not consumed during the reaction and are able to be used numerous times. Enzymes work by lowering the activation energy for a reaction, dramatically accelerating the rate of the reaction. Enzymes are composed of proteins, their exact function is determined by their structure, which is a combination of the sequence of amino acids (from which all proteins

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    Essay Length: 452 Words / 2 Pages
    Submitted: January 10, 2010 By: Kevin
  • Enzymes

    Enzymes

    Introduction Enzymes are protein catalysts which are crucial to life. Enzymes are proteins that help to spped up chemical reactions in the body. Without enzymes, many of the important processes of life could not happen. Enzymes are very specific in their functions. Each enzyme has only one reaction that it can help. Enzymes are not changed when they perform their function. This means that the same enzyme molecule can be used over and over again.

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    Essay Length: 314 Words / 2 Pages
    Submitted: May 26, 2010 By: Jon
  • Enzymes

    Enzymes

    Experiment 1: In preparing the effects of environmental conditions on enzyme reactions, the altering of enzyme in solutions vary upon how abundant a substrate is. This experiment will produce how much enzyme solution should be used in the following assay. To begin this procedure a mortar and pestle should be used to crush a lactide pill. This will be seen in the introductory steps as well as two small one hundred milliliter beakers, a timer,

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    Essay Length: 811 Words / 4 Pages
    Submitted: November 11, 2018 By: umsabrina
  • 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

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    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

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

    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

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

    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.

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    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

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    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

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    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

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    Essay Length: 318 Words / 2 Pages
    Submitted: November 19, 2009 By: Jack
  • Epidemiology Is the only Way of Asking Some Questions in Medicine.

    Epidemiology Is the only Way of Asking Some Questions in Medicine.

    Epidemiology is the only way of asking some questions in medicine. My view on epidemiology has changed a lot since the beginning of the course. I always viewed it as a subject that is important to learn about how a disease brings about changes in the community, but every chapter that I studied revealed a more different meaning to epidemiology. In day to day practice the amount of dose that is specified for a child

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    Essay Length: 361 Words / 2 Pages
    Submitted: March 19, 2019 By: shreyaghoshal
  • 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

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    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

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    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,

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

    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). Chemfinder.com is an excellent site to find this data. The physical data are

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    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

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    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

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    Essay Length: 518 Words / 3 Pages
    Submitted: March 22, 2010 By: Edward
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