Mutants of Escherichia coli and Salmonella typhimurium were selected on the basis of their spontaneous leakage of ribonuclease I. The mutants also leaked several other periplasmic enzymes into the medium during active growth but did not leak the intracellular enzymes glucose-6-phosphate dehydrogenase or phosphoglucose isomerase.

We have modified the procedure of Levy [Ann. Clin. Lab. Sci. 6, 474 (1972)] for determination of serum triglycerides. The changes consist of using heptane in place of nonane; using concentrated aqueous potassium hydroxide instead of sodium methylate as the saponifying reagent; and a somewhat higher saponification, oxidation, and condensation temperature. Consequently, the yellow dehydrolutidine derivative is determined in a homogeneous solution having an almost linear absorbance up to 3 g/liter.

Carbenoxolone produced a marked and dose-related inhibition of ethanol-induced gastric lesions in rats. This cytoprotective action was inhibited progressively and significantly by increasing doses of indomethacin. The evidence presented confirms previous suggestions that prostaglandin(s) are involved in the cytoprotective action of carbenoxolone.

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