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By R.H.F Manske, H.L. Holmes

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R. 99, 853-854 (1954). 263. M. F. Makkovcev and A. A. Sirotenko, Fizwl. Rastenii Akad. R. 3, 79 (1956). 264. G. S. Iljin, Fizwl. Rastenii Akad. R. 2, 573-577 (1955). 265. R. , Proefschrift, Groningen (1952). 266. G. I. Laschuk, Doklady Akad. R. 60, 1357 (1948). 267. K. Mothes and A. Romeike, Biol. Zentr. 70, 97-113 (1951). 268. P. Reinouts van Haga, Proefschrift, Teohnische Hochschule Delft, 64 p. (1956). 269. K. L. Hills, E. M. Trautner, and C. N. Rodwell, Australian J. Sci. 9, 24 (1946). 270.

Bowden and L. Marion, Can. J. Chem. 29, 1037-1042, 1043-45 (1951). 261. B. T. Cromwell, Biochem. J. 64, 259-266 (1956). 262. 0. V. Bogdasevskaja, Doklady Akad. R. 99, 853-854 (1954). 263. M. F. Makkovcev and A. A. Sirotenko, Fizwl. Rastenii Akad. R. 3, 79 (1956). 264. G. S. Iljin, Fizwl. Rastenii Akad. R. 2, 573-577 (1955). 265. R. , Proefschrift, Groningen (1952). 266. G. I. Laschuk, Doklady Akad. R. 60, 1357 (1948). 267. K. Mothes and A. Romeike, Biol. Zentr. 70, 97-113 (1951). 268. P. Reinouts van Haga, Proefschrift, Teohnische Hochschule Delft, 64 p.

0- and N-Methylations serve to detoxicate phytotoxic phenols and other compounds. For example, nicotinic acid in large quantities is toxic to plants but is readily methylated to the innocuous trigonelline (392). The formation of hordenine from tyrosine has already been noted. Its methylation to N-methyl derivatives can be achieved by feeding the barley with formate, choline, or methionine (218, 373, 393-396). The methyl group on the pyrrolidine nitrogen of nicotine is derivable from methionine, where it is transferred as such (397,398),from choline, which is probably first oxidized to betaine (399, 400), from formaldehyde (401), from glycine and from glycolic acid, of which the a-carbon is transferred (402, 403), and from serine (402) and from glycolic acid (403), from both of which the 8-carbon is transferred.

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