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At least 811 records · Page 45Linked to original sources
PubMed2001

Thermodynamics of the distribution of some carboxylic acids between organic solvents and a perchlorate solution.

The distribution of formic, benzoic and 4-methylbenzoic acids between a 0.1 mol dm(-3) (Na+, H+)ClO4- solution and octanol and carbon tetrachloride was studied at five different temperatures of 10 - 30 degrees C. The thermodynamic parameters for the transfer process of monomeric acid between two phases and for the dimerization of monomeric acid in carbon tetrachloride (deltaH and deltaS) were evaluated from the van't Hoff isochore. The free-energy change for the transfer of a methylene group from water to organic solvents was entropically controlled, irrespective of the organic solvents. The distribution constants of formic and benzoic acids were larger than those expected from the distribution constants of acetic and phenylacetic acids, respectively. The free-energy change for all solutes, except for benzoic and 4-methylbenzoic acids, was also entirely entropically controlled in the case of octanol as a solvent. The enthaly-entropy compensation for the dimerization constant of acids in carbon tetrachloride was observed.

Carboxylic Acids↗
PubMed1975

A comparative study of iodine and potassium perchlorate metabolism in the laying hen. 1. incorporation of I-131 in chicken ova.

The uptake of 131-I in chicken ova was studied for 3 hours after a single intramuscular dose. There was uptake as early as 10 minutes and it continued throughout the 3 hours in spite of a rapid decrease in blood activity. The fast growing ova, weightin 0.5 to 2.0 grams, were the most efficient in the uptake of 131-I per unit weight. Autoradiograms of the topographic distribution of 131-I showed a peripheral deposition. When multiple doses were given, concentric rings in the growing ovocytes were seen.

Animals↗