HARRY A. KEENER

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It is an established fact that some vitamins of the vitamin B complex are synthesized by microorganisms in the intestinal tract. Mitchell and Isbell (1) have shown that such activity occurs in the rat. Similar results have been reported for the human with respect to thiamine (2-4), riboflavin (4-6), and other vitamins (4). With respect to adult ruminants it(More)
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