extract caffeine from tea powder using polar - nonpolar solvent extraction technique. Theory: The technique used to separate an organic compound from a mixture of compounds is called Extraction. Extraction process selectively dissolves one or more of the mixture compounds into a suitable solvent. The solution of these dissolved compounds is referred to as the Extract. Here the organic solvent dichloromethane is used to extract caffeine from an aqueous extract of tea leaves because caffeine is more
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Teratogenetics: Caffeine as a teratogen Chase Palmer Fremont High School Hansen p.4 Abstract The purpose of this paper is to identify the teratogenetic affects of caffeine in unborn children and breast feeding children. The following topics will be discussed: Risk of congenital anomalies‚ risk of spontaneous abortion‚ risk of low birth weight and preterm labor as well as‚ the critical period of the teratogen‚ short term and long term affects‚ and the changing danger of the teratogen relating
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Daphnia are cold-blooded poikilotherms that rely on heat from the surrounding water to maintain their body temperature. An increase in the water temperature should equate to an increase in metabolic activity due to enzymes working at a temperature closer to their optimum level. However‚ once the optimum temperature has been exceeded‚ the enzymes will begin to denature. Hydrogen bonds‚ which keep the protein conformation‚ begin to break‚ causing a change in shape of the active site; substrates
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Speech Outline Title: Caffeine Specific purpose: To inform my audience about the effects and health issues of caffeine. Thesis: Caffeine can have many different effects on the body depending on the amount of consumption. Introduction A. Attention Getter – How many of you here consider yourself caffeine addicts? How much soda do you drink a day? One bottle? Two cans? More? How about coffee? B. Thesis statement – Caffeine can have many different effects on the body depending on the amount
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The Effects of Caffeine 1 The Effects of Caffeine and Placebo on Computer Typing Skills St. Olaf College May 14‚ 2009 The Effects of Caffeine 2 Abstract This study examined the effects of caffeinated versus caffeine-free CocaCola and Diet Coke on the speed‚ accuracy‚ error and words per minute of typing skills. 30 undergraduate students participated in the experiment for academic credit for an introductory to psychology class. The participants consumed their choice of soda and were
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An Investigation To See The Effect That Alcohol Has Upon The Heart Rate Of Daphnia. Aim: In this investigation I am going to see how alcohol affects the heart. Due to the ethical and safety issues involved in using in an investigation such as this I am going to use Daphnia (water flea) to conduct this experiment. Although humans and Daphnia are very different organisms‚ the affect that alcohol has upon the heart should be similar. Hypothesis: The hypothesis I am going to test during the
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neurogenic hearts. The myocardial cells need neural input from the cardiac ganglion to be able to beat whereas the myogenic hearts of vertebrates will beat without neural input. The neural input sets the resting heart rate and contractile force of the neurogenic heart. The heart rate of the neurogenic and myogenic hearts is regulated by neurotransmitters. Hearts in vertebrates are excited by epinephrine and serotonin although with varied effects and inhibited by acetylcholine. Invertebrates’ heart rates
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and coffee and are they safe? There are hundreds of different brands of energy drinks being marketed and their caffeine content per can or bottle ranges from just 50 mg to as much as 505 mg (Weise‚ 2008). Energy drinks are most commonly consumed by people 11-35 years old (Ballard et al.‚ 2010). Energy drink companies can say anything they want about energy and performance effects of the drinks‚ and while some energy drinks are banned in some countries‚ none are banned in the United States (Higgins
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Caffeine is a drug commonly used as a central nervous system stimulant. It is found in plants like coffee and tea. Caffeine can also be found in soft drinks‚ and it is regarded as the most widely consumed stimulant drug in the world based on Nehlig‚ Daval‚ & Debry (1992) research. The interaction of caffeine with adenosine receptors in the brains makes an individual more alert. A moderate intake of caffeine results in small healthy risks while high doses could be a catalyst to negative effects like
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Determining the Effect of Arousal on the Heart Rate and Blood Pressure of Adolescent Males Wyatt Griffith and Michaela Rodriguez Wood River High School Hailey‚ ID 83333 ABSTRACT When male adolescents were unknowingly placed in an isolated environment with an attractive woman‚ there wasn’t enough viable data to determine whether or not their blood pressure increased. Based on our limited and unreliable data there is no significant increase in the heart rate or blood pressure of male adolescents
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