Input acid compositions influenced

Barbano and Sherbon (1981) found that feeding cows a protected poly unsaturated fat supplement had little influence on the fatty acid composition of the milk phospholipids. The biosynthesis of the pools of fatty acids from which milk phospholipids are synthesized is apparently independent of dietary input. 

Many properties and conditions influence the capability of materials to serve as catalysts for a particular reaction. First, the composition of the material is important, identified by the chemical elements or compounds present, and by their respective mass or molar fractions in the material. Furthermore, the structure and texture of the material, which are determined mainly by the preparation method employed, play an important role. The composition and structure of the bulk and the surface are interconnected with further properties of the material, such as acidity, basicity, redox potential, and electronic conductivity these properties are usually denoted as descriptors (cf. Klanner, 2004 Klanner et al, 2004 Farrusseng et al, 2005). Finally, the catalytic performance of a material does not depend solely on the material itself, but also on the conditions to which that material is exposed in the reaction, at a particular temperature, partial pressures of the reactants, total pressure, and space velocity of the feed. The descriptors of the material and the reaction conditions together are called input variables in the sequel. 

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