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- W4246573669 abstract "THE Biochemical Journal more than maintains its increasing and well-deserved reputation in the ocurrent number (vol. x., No. 3). The articles of most general interest are two on feeding experiments, which were carried out at the Cambridge Biochemical Laboratory under Prof. F. G. Hopkins's direction. These experiments are a continuation of the very careful and oelaborate series which Prof. Hopkins has been making for several years past upon the growth factors of foods. In all of them young albino rats of uniform origin, sex, and weight are employed. They are fed and treated in an exactly similar manner, except with regard to the essential factor with which the investigation is concerned. The food consists of starch, canesugar, fat, suitable salts, and various protein products, together with the alcoholic extract of 1·5 c.c. of milk per diem, as this extract contains an unknown “vitamine,” which is absolutely essential for the normal growth of the rats. In the first series of experiments, carried out by G. Totani, it was found that rats fed on the hydrolysed products of caseinogen from which all but 0.2 per cent, of the tyrosine had been removed, and to which a small quantity of tryptophane had been added, grew just as rapidly as on a similar diet to which tyrosine was added in addition. Other experiments made with a diet of hydrolysed gelatin—which contains no tyrosine or tryptophane—showed that whilst the rats lost 18 per cent, in weight in a month, they lost little, if any, weight if tryptophane were added. The addition of tyrosine as well was without influence, and so it seems highly probable that the tissues of the mammal have the power of synthesising tyrosine. They form it from phenylalanine, but the small amount of this substance present in gelatin suggests the possibility that they can synthesise the benzene ring from non-aromatic substances." @default.
- W4246573669 created "2022-05-12" @default.
- W4246573669 date "1916-12-01" @default.
- W4246573669 modified "2023-09-27" @default.
- W4246573669 title "Growth Factors of Foods" @default.
- W4246573669 doi "https://doi.org/10.1038/098300a0" @default.
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