Biochem. J. (1995) 305‚ 17-20 (Printed in Great Britain) 17 RESEARCH COMMUNICATION The effect of low temperatures Nicole MORE‚ Roy M. DANIEL* and Helen H. PETACH on enzyme activity Thermophile Research Unit‚ University of Waikato‚ Private Bag 3105‚ Hamilton 2001‚ New Zealand The stability of two enzymes from extreme thermophiles (glutamate dehydrogenase from Thermococcales strain ANI and f‚- enzymes‚ glucosidase from Caldocellum saccharolyticum expressed in Escherichia
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The present invention relates to polyvinyl chloride plastisol compositions‚ for example sealant compositions. In the manufacture of automobiles‚ the automobile body is initially primed with a coating composition to prevent corrosion of the metal. This can be done in a number of ways although generally it is performed by cationic electrodeposition using the auto body as the cathode. Once the automobile body has been primed in this manner‚ subsequent steps in the assembly are carried out. These
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and their derivatives. These include: Dipropyl disulphide (which is used as a flavour compound)‚ Allicin (which has antidiabetic‚ antihypertensive‚ antibiotic and antithrombotic activities)‚ diathyl sulphide (which is of insecticidal property)‚ Dimethyl disulphide (which is used as a gas odorant and in chemical synthesis)‚ Mercaptopropane or propylmercaptan (which is used as flavour compound). Onions also contain quercetin‚ a flavonoid (one category of antioxidant compounds).
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A New DME Production Technology and Operation Results A New DME Production Technology and Operation Results Yotaro Ohno Committee member‚ Japan DME Forum General Manager‚ NKK Corporation Japan Abstract Dimethyl Ether(DME) is a clean and economical alternative fuel which can be produced from various resources as natural gas‚ coal or biomass through synthesis gas. The properties of DME are similar to those of LPG and it can be used for various fields; power generation fuel‚ transportation fuel
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FOUNDATION CHEMISTRY II CHM096 CHAPTER 1 ORGANIC CHEMISTRY PART I PREPARED BY SYED ABDUL ILLAH ALYAHYA BIN SYED ABD KADIR 1 TOPICS PART I 1.1 1.2 1.3 1.4 1.5 Introduction to Hydrocarbon and Functional Groups Alkanes and Cycloalkanes Isomerism and Overview of Organic Reaction Alkenes and Alkynes Alkyl Halides 2 TOPIC INTRODUCTION TO HYDROCARBON AND FUNCTIONAL GROUPS 3 1.1 Introduction to Hydrocarbon and Functional Groups What is Organic Chemistry?
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already raised concern that the maleate salt of Amlodipine‚ unlike the besylate and mesylate salts‚ suffer from intrinsic chemical instability resulting in the formation of a biologically active degradation product [17]. Some studies‚ including that by Suh et al.‚ report how one of the by-products obtained by the degradation of the maleate salt moiety is a derivate of aspartic acid [18-20]. A citizen’s petition was organised in 2002 to revoke acceptance of Amlodipine maleate as a clinically equivalent
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recoveries of Cilnidipine and Chlorthalidone were found to be in the range of 100.053-100.959% and 100.326-100.90%‚ respectively. Keywords: Cilnidipine‚ Chlorthalidone‚ HPLC. Cilnidipine (CIL) O3-(2-methoxyethyl) O5-[(E)-3-phenylprop-2-enyl] 2‚6-dimethyl-4-(3-nitrophenyl)-1‚4-dihydropyridine- 3‚5-dicarboxylate is off white crystalline powder soluble in DMSO‚ ethanol‚ methanol‚ water. Cilnidipine is L and N type calcium channel blocker used in treatment of hypertension due to its vasodilating effect(1)
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A simple‚ rapid‚ specific and highly sensitive spectrofluorimetric method has been developed for the quantification of dabigatran etexilate mesylate (DAB) in bulk and capsule dosage form. A linear relationship was found between fluorescence intensity and DAB concentration in the range of 0.01-1.0 μg/ml in DMSO as solvent at an emission wavelength of 391 nm after excitation at 334 nm‚ with a good correlation coefficient (0.989). The detection and quantification limits were found to be 0.005 and 0
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In the reaction mechanism‚ a carboxylic acid‚ m-toluic acid is used to synthesize N‚N-diethyl-m-toluamide‚ also know as DEET‚ through a nucleophilic acyl substitution reaction. The reaction begins by first converting the m-toluic carboxylic acid into an acyl chlorosulfite through a reaction using thionyl chloride. The carboxylic acid is converted into an acyl chloride because the acyl chloride is more reactive. In this step‚ hydrochloric acid is formed from a hydrogen on the carboxylic acid and a
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CHAPTER 10 Liquids and Solids 1. Order the intermolecular forces (dipole-dipole‚ London dispersion‚ ionic‚ and hydrogen-bonding) from weakest to strongest . a) dipole-dipole‚ London dispersion‚ ionic‚ and hydrogen-bonding b) London dispersion‚ dipole-dipole‚ hydrogen-bonding‚ and ionic c) hydrogen-bonding‚ dipole-dipole‚ London dispersion‚ and ionic d) dipole-dipole‚ ionic‚ London dispersion‚ and hydrogen-bonding e) London dispersion‚ ionic‚ dipole-dipole‚ and hydrogen-bonding Ans: b 2. Hydrogen
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