Science Essays
4,476 Science Free Papers: 3,871 - 3,900
-
The Ecology of Eden" and "the Warming
1.) Give examples of James Burke's hypothesis that the trajectory of human history has been determined by climate. What assumptions of Burke do you agree with and disagree with? Now give examples of James Burke's hypothesis that the trajectory of human history in the future will be determined by
Rating:Essay Length: 10,210 Words / 41 Pages -
The Effect of Different Concentrations of Salt Water on the Growth of Bean Plants
The Effect of Different Concentrations of Salt Water on the Growth of Bean Plants Table of Contents Abstract 3 Introduction 4-5 Methods and Materials 6 Results 7 Discussion-Conclusion 8 Literature Cited 9 Acknowledgements 10 Appendix 11-12 Abstract The problem of this project is what is the effect of different concentrations
Rating:Essay Length: 1,506 Words / 7 Pages -
The Effect of Drugs, Toxins, and Other Molecules on Synapse and Synapse Transmission.
The effect of drugs, toxins, and other molecules on synapse and synapse transmission. The synapse is the small gap separating two neurons, the presynaptic neuron (neuron that carries the impulse to the synapse,) and postsynaptic neuron (neuron that carries the impulse away from the synapse.) It separates the axon terminals
Rating:Essay Length: 1,491 Words / 6 Pages -
The Effect of Exercise on Heart Rate
The Effect of Exercise on Heart Rate The aim of this investigation is to find out how different types of exercise can affect my heart rate. To measure and record my heart rate, I am going to undergo an experimental test. I am going to do 3 different types of
Rating:Essay Length: 1,262 Words / 6 Pages -
The Effect of Ph on the Rate of Osmosis Using a Glucose Solution
The Effect of pH on the Rate of Osmosis Using a Glucose Solution Melissa Werderitch Biology 157 11/6/06 Introduction In a journal article written by Florian Lang, osmosis is essentially explained as the flow of water from one area to another that are separated by a selectively permeable membrane to
Rating:Essay Length: 1,323 Words / 6 Pages -
The Effect of Soil Ph on the Living Conditions
The Effect of Soil pH on the Living Conditions In Lumbricus terrestris Abstract The difference in soil pH weighs a heavy measure on the appearance of the earthworm Lumbricus terrestris in different areas of soil. A highly acidic or highly alkaline soil may be the underlying reason for the absence
Rating:Essay Length: 2,211 Words / 9 Pages -
The Effect of Substrate Concentration on the Activity of the Enzyme Catalase
The Effect Of Substrate Concentration On The Activity Of The Enzyme Catalase Aims This is an experiment to examine how the concentration of the substrate hydrogen peroxide affects the rate of reaction of the enzyme catalase. Background Information Enzymes are protein molecules. They are used to speed up specific reactions
Rating:Essay Length: 1,190 Words / 5 Pages -
The Effect of Sucrose on Liver Cells
Prediction Osmosis is the "net movement of water molecules from an area of high water potential to an area of low water potential through a partially permeable membrane." The diagram below illustrates the process of osmosis. (See Figure 1) As shown by the Figure 1, water molecules move from a
Rating:Essay Length: 3,675 Words / 15 Pages -
The Effect of Temperature on the Growth and Survival of Micro-Organisms.
The electrical activity of the heart: the electrocardiogram Electrical activity is a basic characteristic of the heart and is the stimulus for cardiac contraction. Disturbances of electrical function are common in heart disease. Their registration as an electrocardiogram (ECG) plays an essential role in the diagnosis and management of
Rating:Essay Length: 4,165 Words / 17 Pages -
The Effects of Altitude on Human Physiology
Changes in altitude have a profound effect on the human body. The body attempts to maintain a state of homeostasis or balance to ensure the optimal operating environment for its complex chemical systems. Any change from this homeostasis is a change away from the optimal operating environment. The body
Rating:Essay Length: 4,119 Words / 17 Pages -
The Effects of Caffeine
Abstract Caffeine is a widely used substance in the day to day diets of most athletes, with daily consumption reported to be between 70-76 mg per person worldwide. The aim of this study is to find out what effect caffeine will have on performance, during a 1 km cycle. The
Rating:Essay Length: 2,148 Words / 9 Pages -
The Effects of Creatine
The Effects of Creatine Creatine has been used in sports throughout time. Athletes have always had a fascination with being excellent at what they do. With the banning of steroids from competitive sports and the implementation of random drug testing in most sports, most athletes are still somehow hoping to
Rating:Essay Length: 1,040 Words / 5 Pages -
The Effects of Different Wavelengths of Light on the Rate of Photosynthesis
The effects of different wavelengths of light on the rate of photosynthesis Introduction This experiment was performed to investigate the effects of different wavelengths of light on the rate of photosynthesis. If a multiple colored film petri dishes are place under a 50 watt lamp, then the rate of photosynthesis
Rating:Essay Length: 1,002 Words / 5 Pages -
The Effects of Environmental Factors on the Absorbance of Escherichia Coli
Introduction In this experiment, the gram negative bacterium Escherichia coli is being subjected to various environmental factors that affect the rate of growth. These factors scrutinized were the different types of nutrients, the intensity of aeration, or the temperature at which it was stored. The purpose of this lab is
Rating:Essay Length: 1,662 Words / 7 Pages -
The Effects of Ephedra and Ephedrine Alkaloids in Weight Loss and Fitness
The Effects of Ephedra and Ephedrine Alkaloids in Weight Loss and Fitness With the rise in obesity consciousness and the desire to lose weight rapidly a wide array of dietary supplements have flooded the market over the past few years. Many of these pills, powders and drinks promise accelerated weight
Rating:Essay Length: 1,043 Words / 5 Pages -
The Effects of Genetically Modified Organisms
The Effects of Genetically Modified Organisms In the case of genetically modified organisms, or GMO's, there are many viewpoints surrounding the effects of introducing manipulated genetic codes into our current food supply. Blind consumers, common farmers, and corporate entities that produce GMO's, all see GMO use differently. What is
Rating:Essay Length: 502 Words / 3 Pages -
The Effects of Global Warming
THE EFFECTS OF GLOBAL WARMING "Global warming will be the greatest environmental challenge in the 21st century." - Vice President, Albert Gore. One of the most current and widely discussed factor which could lead to the ultimate end of existence of Earth and man is global warming and its devastating
Rating:Essay Length: 3,143 Words / 13 Pages -
The Effects of Hiv Mutations on the Immune System
INTRODUCTION The topic of this paper is the human immunodeficiency virus, HIV, and whether or not mutations undergone by the virus allow it to survive in the immune system. The cost of treating all persons with AIDS in 1993 in the United States was $7.8 billion, and it is estimated
Rating:Essay Length: 2,065 Words / 9 Pages -
The Effects of Hydrogen Peroxide on the Fertilization of Sea Urchins Arbacia Punctulata
The Effects of Hydrogen Peroxide on the Fertilization of Sea Urchins Arbacia punctulata Biology 188 Thursday 9:30 Lab Brenda Seidel 13 April 2006 The Effects of Hydrogen Peroxide on Sea Urchins Arbacia punctulata Biology 188 Thursday 9:30 Lab Brenda Seidel 13 April 2006 Abstract The objective of this experiment is
Rating:Essay Length: 1,873 Words / 8 Pages -
The Effects of Losing Rainforest
According to the article satellite images reflect that the Amazon rainforest is diminishing at an enormous rate. About 10,000 square miles of this beautiful forest is being lost to pastures for grazing, soybean plantations, and illegal logging. Since the year before there has been a forty percent increase in
Rating:Essay Length: 579 Words / 3 Pages -
The Effects of Photosynthesis on a Bean
The Effects of Photosynthesis on Bean Plants Purpose: To determine how the quantity of light will effect the growth of a bean from seed. Hypothesis: I think that the bean that is in light constantly for 24 hours will grow more quickly than the bean in full sunlight and in
Rating:Essay Length: 1,308 Words / 6 Pages -
The Effects of Second Hand Smoke
The Effects of Second Hand Smoke What is second-hand smoke? Second-hand smoke or environmental smoke as it is sometimes called, is a combination of the smoke coming off a burning cigarette, pipe or cigar and the smoke exhaled by a smoker. Second-hand smoke is a very awful disease that
Rating:Essay Length: 1,033 Words / 5 Pages -
The Effects of Smoking on the Unborn
The Effects of Smoking on the Unborn There are many risk factors concerning the effects of smoking and the unborn. Medical evidence has established that smoking during pregnancy increases the risks of miscarriage, growth retardation, premature birth, low birth weight, and sometimes even death of the newborn. In April 1995,
Rating:Essay Length: 1,049 Words / 5 Pages -
The Effects of Stress on Short Term Memory
The effects of Stress on Short Term Memory When someone says the word stress the mind immediately shifts to a negative thought with painful consequences, although stress can be either positive or negative. Negative stress has been blamed for a variety of health issues as well as psychological and physiological
Rating:Essay Length: 6,577 Words / 27 Pages -
The Efficacy of Camellia Sinesis on Thermogenic Activity
The Efficacy of Camellia sinesis on Thermogenic Activity Camellia sinensis, commonly known as green tea, has been used in medicine and social culture for thousands of years. Only recently it has gained scientific validity in its active principles in the treatment of a variety of ailments such as a cancer
Rating:Essay Length: 754 Words / 4 Pages -
The Emergence of West Nile Virus
THE EMERGENCE OF WEST NILE VIRUS: A LITERATURE REVIEW Christopher Allan F. Reballos INTRODUCTION The year 1999 was an alarming year when an outbreak of arboviral encephalitis arrived in North America (Nosal and Pellizzari, 2003; Petersen et al, 2002; Scaramozzino et al, 2001). This epidemic spread rapidly across North America,
Rating:Essay Length: 4,954 Words / 20 Pages -
The Empirical Formula of a Copper Oxide Lab Report
Steven Leung 9/19/06 Lab Report The Empirical Formula of a Copper Oxide Purpose: To convert an unknown copper oxide to copper (Cu) metal using natural gas to provide a reducing environment as shown below: Cu O (s) + CH (g) ЃРCu (s) + Co (g) + H O (g)
Rating:Essay Length: 360 Words / 2 Pages -
The Energy of a Nuclear Bomb
The energy of a nuclear bomb comes from inside the nucleus of the atom. Mass is converted into energy according to E = mc2. This energy is the binding energy of the nucleus, the glue that keeps the nucleus of the atom together. Radiating particles In some cases, the nuclear
Rating:Essay Length: 324 Words / 2 Pages -
The Energy Riddle
The Energy Riddle Rakesh Mohan Hallen Energy is the basic necessity for life. But for energy no form of life would have ever emerged. We all know energy for providing us light and comfort. It can help us to cool down during summers and feel warm during winters. It also
Rating:Essay Length: 935 Words / 4 Pages -
The Enhanced Green House Effect
The Enhanced Greenhouse Effect For the past ten thousand years the earth's climate has been extremely good and beneficial to mankind. Today however , major changes are taking place. Humans beings are changing the face of the entire planet by destroying the rain forests and pumping our pollutants into
Rating:Essay Length: 1,828 Words / 8 Pages