(9) Curphey‚ T.‚ Hung‚ C.Y. and Chu‚ C.C. J. Org. Chem.‚ 40(5)‚ 607-614 (1975). (10) Chiba‚ T.‚ Okimoto‚ M.‚ Nagai‚ H. and Takata‚ Y. J. Org. Chem.‚ 44(20)‚ 3519-3523 (1979). (11) Iglesias‚ E. J. Org. Chem.‚ 68(7)‚ 2680-2688 (2003). 3.3 cm (0.3×11 protons) of the 4.6 cm intergral height was assigned to the enol structure. Enol % = 3.3/4.6 × 100 = 71.7%‚ Keto % = (4.6-3.3)/4.6 × 100 = 28.3%. The enol structure was the major form of 2-acetylcyclohexanone‚ same as the Pavia et al [1] and Igiesias [11]
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IIn part A‚ the unknown 30 was identified as Histidine by using a thin layer chromatography. Among the four amino acid standards (Ala‚ Gly‚ His‚ and Ser)‚ the average Rf value of the unknown (0.31) was closest to that of standard Histidine (0.29) and its Rf percent error was lowest (6.9%). Furthermore‚ the color‚ shape‚ and size of the unknown clearly corresponded to that of Histidine standard. Overall‚ the experiment was successful in identifying the unknown amino acid‚ for the obtained Rf and
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Atom- smallest unit of matter that still retains the properties of an element. * Three types of subatomic particles: neutrons‚ protons‚ and electrons. * Electrons travel nearly at the speed of light‚ forming a cloud around the nucleus. * Dalton is a measurement used to measure subatomic particles. (same as atomic mass unit or amu) * Neutrons and protons weight about 1 Dalton. * Electrons weight so less that they do not contribute in
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Lesson 5/ Key Questions: 18. In the morning‚ when you wake up‚ before you eat‚ go for a walk ‚ swim‚ something for around 3-10 minutes. It will help get your metabolism started and work better through out the day. I would suggest cutting those 2 beers a night into one‚ or maybe 2 every other day‚ or 2 a week. I would eat something like oatmeal in the morning‚ or simple toast with eggs and HAM. Bacon is high in fat and calories. And always get fruit. And Change up your lunch. Make a sandwich. or
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CONFIDENTIAL BM/APR2011/MKT420 UNIVERSITI TEKNOLOGI MARA FINAL EXAMINATION COURSE COURSE CODE EXAMINATION TIME PRINCIPLES AND PRACTICE OF MARKETING MKT420 APRIL 2011 3 HOURS INSTRUCTIONS TO CANDIDATES 1. 2. 3. 4. This question paper consists of six (6) questions. Answer only four (4) questions in the Answer Booklet. Start each answer on a new page. Do not bring any material into the examination room unless permission is given by the invigilator. Please check to make sure that this
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Enzymology‚ Catalytic Mechanism‚ Carbohydrate Metabolism‚ Adenosine Triphosphate Enzymes are proteins and their function is to act as catalysts to speed up certain chemical reactions in the cell that would be slower without them. This process occurs as steps in a cycle with separate reactions in each step. If there is a missing product the step in the cycle will be incomplete and the normal function of the organism cannot be accomplished causing negative effects on the organism. The biological
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center‚ called a nucleus. The nucleus contains positively charged particles called protons and uncharged particles called neutrons. The nucleus of an atom is surrounded by negatively charged particles called electrons. The negative charge of an electron is equal to the positive charge of a proton‚ and the number of electrons in an atom is usually equal to the number of protons. When the balancing force between protons and electrons is upset by an outside force‚ an atom may gain or lose an electron
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absorption bands. The 1H NMR spectra showed signals corresponding to the two methylene protons in addition to the aryl and NH proton of the 1‚2‚4-triazole ring.
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Ligands act as Lewis bases by electron pair donation to form the metal-ligand bond. Bronsted-Lowry acid-base theory reminders (essentially a sub-set of Lewis Theory) A base is a proton acceptor. This is via an electron lone pair on the base (a Lewis base is a lone pair donor). e.g. NH3‚ HCO3-‚ OH- etc. An acid is proton donor. This involves a heterolytic breakage of an X-H bond (a Lewis acid is an electron pair acceptor). e.g. HCl‚ HCO3-‚ H2SO4‚ CH3COOH etc. • Many hexa-aqa complex ions
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Evolution is a central‚ unifying theme in biology because the enormously diverse forms of life on Earth have all been shaped by it An atom with an unequal number of protons and electrons is called an ion. This produces a charged atom‚ or ion. An ion is an atom with a number of electrons that is different than the number of protons. The naturally occurring helium atom is chemically inert because: its outermost shell is filled with electrons. A chemical element is uniquely identified
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