CHRONIC EFFECTS OF LOW-LEVEL RADIATION UPON PROTEIN AND AMINO ACID REQUIREMENTS

摘要

Immature male rats were fed highly purified diets containing 10, 15, 25, or 45% protein in the form of a cystine-supplemented casein and were continu¬ously exposed for periods as long as 20 weeks to gamma radiation from a cesium-137 source at levels of 0.3, 3, 30, or 300 r per week. Control groups were fed the same diets but were not irradiated. The effects of radiation were neither dimin¬ished nor accentuated by alterations in the protein content of the diet. Substituting other proteins or mixtures of amino acids isonitrogenously for cystine-supple-mented casein was also without significant effect on radiation response.