[Comparative study of the protective effects of 3 carboxylic acids on urea and ammonia toxicity in sheep].

Three carboxylic acids (acetic, propionic and citric) were compared as to their protective effect in controlling the toxic and lethal action of urea in sheep. It was derived from the metabolic and clinical studies that citric acid was the most effective of all the acids studied and can be used in the preventive treatment of sheep against the toxic lethal action of urea and ammonia. The mechanism of the action of citric acid is also discussed in relation with other findings.

Electrical noise from synthetic membranes.

Voltage fluctuations were measured across collodion membranes acting as a constraint between two identical aqueous salt solutions, in the presence of an applied electrical potential difference. Membranes with d-c resistance between 1 and 20 MΩ cm(2) were studied, in solutions of KCl between 0.01 and 1.