The effects of caffeine on the heart rates of Daphnia. Introduction In the water flea‚ Daphnia‚ the single‚ small heart is easily visible when viewed under a low power microscope. The heart rate can be monitored and measured in different conditions‚ such as change in water temperature‚ or in this case‚ the concentration of chemicals added to the water they habitat. A change in daphnia heart rate under the influence of a concentration of caffeine solution creates a procedure providing an interesting
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Extraction of Caffeine from Thea sinensis Abstract Extraction of Caffeine from Thea sinensis main objective is to isolate‚ purify characterized caffeine from tea leaves. Sublimation technique was used to get the % yield which is 0.07%. The melting point of the standard caffeine with the sublimate is 229°C. Introduction The active ingredient that makes tea and coffee valuable to humans is caffeine. Caffeine is an alkaloid; a class of naturally occurring compounds containing nitrogen and
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Caffeine Ruler Reaction Time Test * OBSERVATION/ASK QUESTION * INTRODUCTION/RESEARCH * HYPOTHESIS * EXPERIMENT/DATA * CONCLUSION Materials · Ruler · Paper · Pencil · Chart ::OBSERVATION:: Those drinking coffee appear to be more alert in class. Does drinking coffee improve mental and physical function? } } { { Can the effects of coffee alter coordination? ::HYPOTHESIS:: Caffeine improves your mental &
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Isolation of caffeine from tea leave Abstract:- Introduction:- Caffeine is probably the most commonly used addictive drug. This drug is found in a number of things ingested by people. It belongs to a group of nitrogen bases called purines. Because caffeine possesses these base-like properties‚ it is described as an alkaloid. They usually taste bitter and often are physiologically active in humans. The structure of caffeine is shown below. Figure 1: Structure of Caffeine In this experiment
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In this lab‚ caffeine was extracted from black tea‚ and green tea through a vacuum filtration‚ and a rotovap. The melting point of the sample of black tea was 219.12-236.05 ˚c‚ and for the green tea it was 176.22-227.6 ˚c. The % error of the melting point indicates how much error there was from the melting point taken experimentally. The % error of the melting point for black tea was 0.44%‚ and for green tea it is 3.15%.Since the theoretical melting point of caffeine is between 235-237 ˚c‚ we can
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TITLE: Effect of the caffeine on the heart rate OBJECTIVE: To investigate the effect of the caffeine on the heart rate of living organisms. INTRODUCTION: * Daphnia Daphnia are small‚ planktonic crustaceans‚ between 0.2 and 5 mm in length. Daphnia are members of the order Cladocera‚ and are one of the several small aquatic crustaceans commonly called water fleas because of their saltatory swimming style (although fleas are insects and thus only very distantly related). They
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Andrew Aluko March 28‚ 2011 Sports and Nutrition Professor Saullo Alcohol and Athletics Alcohol‚ more specifically ethyl alcohol or ethanol‚ is a depressant that provides 7 kCal of energy per gram‚ and is the most abused drug for athletes and non-athletes in the United States. Prior to my research on alcohol‚ I assumed that alcohol abuse was not prevalent among college athletes‚ outside of the occasional partying that normal college students partake in as well. But according to Lifestyles
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Introduction Fetal alcohol syndrome is the most common preventable form of mental retardation in the world. FAS causes a range of disorders‚ is found in all ethnic groups and populations and is most prevalent is impoverished communities. In South Africa‚ epidemiological studies have shown that rural populations in the Western Cape are particularly affected and have FAS rates exceeding those reported in other world communities. Fetal Alcohol Syndrome is a series of birth defects caused by
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DRINKING AND ALCOHOL ABUSE Going out on a Friday night in highschool almost always seems to be accompanied by alcohol. In 2003 the proportion of grade 12 students who admitted drinking an alcoholic beverage in the past 30 days was 48%‚ while 1 in 10 students drink atleast once a week. My question is‚ why does alcohol have to become such a large part of the highschool social circle? And‚ are any of these kids really aware of the effects of youth onset alcohol abuse and the effects of alcohol on the
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today’s modern society alcohol addiction and alcohol abuse has become one of the most complex‚ life-threatening issues. Most depressed individuals usually indulge themselves in bars or pubs with their alcohols to escape from their stressful life. It has become increasingly alarming how alcohol does not only attract the adults‚ but also teenagers these days. "Research has shown that approximately 14 million Americans (7.4%) of the population meet the diagnostic criteria for alcohol abuse or alcoholism"
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