COMPOUNDS RELATED TO DIMETHYLTHETIN AS SOURCES OF LABILE METHYL GROUPS

The oxidation of dimethylthetin and related compounds to sulphate in the rat.

Sources of Betaine as Methyl Group Donors in Broiler Diets

Betaine is donor of methyl groups and can partially replace methionine in diets for this purpose. The objective of this study was to evaluate three sources of betaine in partial substitution of methionine supplement in broiler diets. The Cobb-500 broiler chickens were allocated in a completely randomized experimental design with 5 treatments and 7 replicates of 49 birds each. The positive contr...

Oxidation in vivo of the methyl groups of choline, betaine, dimethylthetin, and dimethyl-beta-propiothetin.

It has recently been demonstrated in this laboratory (l-3) that “biologically labile” methyl groups can be oxidized to CO2 in the rat. This has been established by feeding methionine containing radioactive carbon in the methyl group and demonstrating the presence of radioactive CO2 in the expired air. In the present communication a comparison is made of the rates of oxidation of methyl groups a...

Phosphate groups modifying myelin basic proteins are metabolically labile; methyl groups are stable

Young and adult rats received intracranial injections of [33P]orthophosphoric acid. The time course of the appearance and decay of the radioactive label on basic proteins in isolated myelin was followed for 1 mo. Incorporation was maximal by 1 h, followed by a decay phase with a half-life of approximately 2 wk. However, radioactivity in the acid-soluble precursor pool (which always constituted ...

Methyl Mercury: Critical Groups and Sources of Intake

When 'mercury' is released into the environment it may appear as, or be converted into, any of the following chemical forms: metallic mercury (Hg) inorganic mercury (Hg + and Hg *) monomethyl mercury (CH3 Hg+) dimethyl mercury (CH3 Hg CH3) The 'methyl mercury' discussed in this appendix is monomethyl mercury (CH3 Hg+) 1. Man (a) Adult (i) Occupational exposure lab personnel industrial workers a...