Dissociation constants of organic

Common carp (Cyprinus carpio) is highly important culturable species in freshwater and cultured throughout the globe. Its farming require formulated feed with balance protein and energy. Most of the time fish meal is used as a protein source, but it is not acceptable from sustainability point of view. The replacement of fish meal by plant based protein source is advised. The limitation of plant based ingredients like soybean meal is the presence of anti-digestive factors in the form of several protease inhibitors.

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This publication contains the competition problems (Volume 2) from the 21-40, international Chemistry Olympiads (ICHO) organized in the years 1989-2008 and is a continuation of the publication that appeared last year as Volume 1 andcontained competition problems from the first twenty ICHOs.The whole review of the competition tasks set in the ICHO in its fourty-year history is a contribution of the ICHO International.

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The effect of some organic compounds on the activity of chitinase from Serratia marcescens has been investigated. Among these compounds, 1,10-phenanthroline was found to be an inhibitor and ethanol - an activator of the chitinase activity;
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’ dipyridyl and Zn2+ do not take any effect on the chitinase activity. In this investigation, the dissociation constant of an chitinase-metalic ion complex (K1) and the inhibition constant (K2) have been estimated with K1 = 0.1 mcM and K2 = 2.667 mM.

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Food can be defined as the nutritive material taken into an organism for growth, work, or repair and for maintaining the vital processes. Food sustains life, and, as such, many individuals view food as an uncomplicated, pure source of nutrition. Therefore, such individuals are often bewildered to learn that food is comprised of an array of natural chemicals, and not all the chemicals are nutrients or enhance nutritive value, but in fact may decrease nutritional value or, worse still, are toxic (e.g., naturally occurring toxicants).

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Dissociation Constants Of Organic Acids And Bases: This table lists the acid-base dissociation constants of over 600 organic compounds, including many amino acids. All data apply to dilute aqueous solutions and are presented in the form of pKa, which is the negative of the logarithm of the acid dissociation constant Ka.

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