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The author has made an extensive study of vitamin A in relation to human nutrition, and the present volume provides an account of these investigations. The first portion of the book includes a discussion of the chemistry of vitamin A and methods for the determination of vitamin A and of carotene. The account of the investigation includes chapters about (1) introduction and statement of the problem, (2) night blindness as a sign of vitamin A deficiency, (3) review of investigagations of night blindness in large groups, (4) the present investigation, (5) statistical methods, (6) methods and review of earlier investigations on the assimilation of carotenoids and vitamin A in the blood, (7) investigation on the assimilation of carotenoids and vitamin A in the blood serum, (8) relationship between the threshold of light perception and the vitamin A content of the serum, (9) relationship between the vitamin A content of the
Studien über das Vitamin A beim Menschen. JAMA. 1939;113(3):257. doi:10.1001/jama.1939.02800280069033
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