residue or protonation of the basic nitrogens on this station. Both of these methods rely on the repulsive electrostatic interactions between the positively charged axial component and the post-switching cationic nature of the benzidine station (Figure 5.4). Deuterated trifluoroacetic acid (d-TFA) was added in the solution which resulted in the protonation of the benzidine residue and shuttling of macrocycle in to the biphenol station of the Rotaxane. This was supported by NOESY 1H NMR that showed a shift
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The effect of varying temperature on thee Rennin enzyme Abstract The purpose of this experiment was to see what affect different temperate had on the reaction rate of the enzyme rennin. The experiment was performed by placing test tubes filled with renin and milk into water bath which was heated or cooled to one of the temperatures trialed. The hypothesis justified because it found because it though data that the enzyme reacted faster with the 45° temperate because it was
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The first case of HIV was diagnosed in 1968. Within the next three decades it became the leading cause of death for adults 25 to 44 years old. AIDS is the final stage of HIV (human immunodeficiency virus) ‚ a virus that ravages the immune system leaving the body susceptible to multiple infections. In the public’s mind HIV/AIDS was a disease that belonged to intravenous drug users‚ homosexuals‚ and others in an unfortunate and stigmatized group. On August 19th 1992‚ Mary Fisher‚ a young‚ white‚ wed
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06 Properties of Compounds Acids and Bases Worksheet Before You Begin: You may either copy and paste this document into a word processing program of your choice or print this page. Directions: Answer the following questions in complete sentences. 1. Describe four properties of acids that you learned in this lesson. React with bases‚ react with metals‚ make things sour‚ cause stinging in cell membranes. 2. Describe four of the properties of bases that you learned in this lesson. Slippery‚ bitter‚
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of the consequences of excessive drinking. After connecting with her‚ I wanted to know if alcohol concentration in spirits would affect the cells in the body. Thus‚ I decided to test my theory by adapting a class beetroot experiment to my investigation. The aim of this experiment is to investigate the effect of alcohol concentration on a biotic cell membrane. The human body cannot live long with damaged cells because they are the building blocks of life. Cell membranes are phospholipid bilayers meaning
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BUFFERS By: Luis P. Bazan‚ RPh.‚ Ph.D. A buffer solution is a solution of: 1. A weak acid or a weak base and 2. The salt of the weak acid or weak base Both must be present! A buffer solution has the ability to resist changes in pH upon the addition of small amounts of either acid or base. Consider an equal molar mixture of CH3COOH and CH3COONa CH3COOH (aq) H+ (aq) + CH3COO- (aq) Adding more acid creates a shift left IF enough acetate ions are present 16.3 Which of the following
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The Development Dictionary A Guide to Knowledge as Power Edited by Wolfgang Sachs " i " .! ’. ’f Zed Books Ltd London and New Jersey Development 7 Development Gustavo Esteva T a say ’yes ’‚ to approve‚ to accept‚ the Brazilians say ’no ’ -: pois nao. But no one gets confused. By culturally rooting their speech‚ by playong With the words to make them speak in their contexts‚ the Brazilians ennch theu conversatIOn. In saying ’development ’‚ however‚ most people
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aspirin‚ Acetaminophen‚ caffeine and mefenamic acid. After the TLC was placed inside a UV chromatography box‚ it appears that the sample analgesic contains D‚ which is mefenamic acid. Keywords: Chromatography‚ Pigments‚ Analgesics‚ TLC Results and discussion Thin layer chromatography is a useful method of quickly determining the main active ingredients of commercial analgesics containing aspirin (A)‚ acetaminophen (B)‚ caffeine (C) and mefenamic acid (D). Thin‑layer chromatography involves the
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Experiment 5 The Quantitative Determination of an Acid in Carbonated Beverages Thomas Canfield Kelly Caddell Chemistry 144B T.A. Brock Marvin 15 October 2012 Methods: Two sodas containing citric acid were investigated in this experiment. Each soda was titrated using one of the two experimental methods. These methods are the traditional titration and the modern titration. Carbonic acid was already removed from the soda by boiling it. Both of the two different titration methods
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9.1 Sulphuric Acid Sulphuric Acid is Manufactured in Industry 1. Sulphuric acid‚ H2SO4 is manufactured in industry through Contact Process. 2. The raw materials used are sulphur‚ air and water 3. The Contact process consists of three stages. Stage 1: The production of sulphur dioxide This can be obtained by two methods: 1. Burning of sulphur in dry air in the furnace S + O SO2 2. Burning of metal sulphide such as zinc sulphide or iron(III) sulphide in dry air. 2ZnS
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