| 单词 | p-p | 
| 释义 | > as lemmasP-P   P-P n. 		(also PP)	 Medicine pellagra-preventive or -preventing (formerly, a designation of the vitamin now called niacin). ΚΠ 1925    J. Goldberger  & W. F. Tanner in  Public Health Rep. 		(U.S. Public Health Service)	 40 77  				It would seem as if the heretofore unrecognized pellagra-preventive factor, to which we shall hereafter refer as factor P-P, were capable of preventing the disease with little if any cooperation from the protein factor of the diet. 1942    F. Bicknell  & F. Prescott Vitamins in Med. v. 259  				Nicotinic acid was at first hailed as the PP or pellagra preventing factor, but it is now known that pellagra is a multiple deficiency disease and that lack of nicotinic acid is only one of the factors in its causation. 1967    H. A. Guthrie Introd. Nutrition xii. 240/2  				Niacin, another water-soluble vitamin identified with the B complex, has been known as nicotinic acid and as the pellagra preventative (P–P) factor. < as lemmas | 
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