881 resultados para Of the image Lula


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Typescript (photocopy) of a speach delivered by Prof. Friendly at the New York Marriott Marquis Hotel, June 10, 1988.

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L-Lysine d-pantothenate, a 1:1 amino acid-vitamin complex, crystallizes in the monoclinic space group P21 with Image Full-size image (1K) .The structure has been solved by direct methods and refined to an R value of 0.053 for 1868 observed reflections. The zwitterionic positively charged lysine molecules in the structure assume the sterically most favourable conformation with an all-trans side chain trans to the α-carboxylate group. The pantothenate anion has a somewhat folded conformation stabilised by an intramolecular bifurcated hydrogen bond. The unlike molecules aggregate into separate alternating layers. The molecules in the lysine layers form a head-to-tail sequence parallel to the a-axis. The interactions which hold the adjacent layers together include those between the side chain amino group of lysine and the carboxylate group in the pantothenate anion. The geometry of these interactions is such that each carboxylate group is sandwiched between two amino groups in a periodic arrangement of alternating carboxylate and amino groups.

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Unambiguous synthesis of 2-methyl-3-isopropenylanisole (Image ) and 2-isopropenyl-3-methylanisole (Image ) has led to revision, from (Image ) to (Image ), of the structure assigned to a monoterpene phenol ether isolated from

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