Abstract
Summary
Radioselenium studies in rats utilizing whole-body counting and determination of urinary and fecal 75Se indicate the existence of a threshold dietary level of selenium above which urinary excretion of selenium is directly related to its dietary level and below which it is not. The threshold lies between 0.054 and 0.084 ppm for the forms of selenium used here. Tissue distribution of 75Se was markedly different in all groups and exhibited no threshold under the conditions of this experiment.
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