Synthesis of Ureido [14C] succinic Acid and Orotic [2-14C] Acid from Urea [14C].

The incorporation of [2-14C] glycine and [6-14C] orotic acid into the acid-soluble ribonucleotides and ribonucleic acids of the rat mammary gland.

It has been reported (Wang & Greenbaum, 1960) that there is an increase in both the total amount and the concentration of the acid-soluble ribonucleotides of the rat mammary gland over the period from pregnancy to late lactation and it was thought that these changes probably reflected the increase of metabolic activity associated with the onset of lactation. Over the same period the RNA of the ...

Preparation of tetramethylcyclopropanecarboxylic-14C acid and insecticidal terallethrin-14C from it.

Esters of tetramethylcyclopropanecarboxylic acid (I) with (•})-allethrolonel1), (•}) -pyrethrolone2) and some others3) have activity comparable to that of corresponding esters of natural (+)-transchrysanthemic acid against some insect species. However, these esters show differences in toxicity to mammals which are probably resulted from differences in rates or pathways of metabolism. Therefore,...

Biosynthesis of abscisic acid: incorporation of radioactivity from [2-14C]mevalonic acid by intact fruit.

Preferential Accumulation of 14C-N-Glycolylneuraminic Acid over 14C-N-Acetylneuraminic Acid in the Rat Brain after Tail Vein Injection

The two main molecular species of sialic acid existing in nature are N-acetylneuraminic acid (Neu5Ac) and N-glycolylneuraminic acid (Neu5Gc). Neu5Ac is abundant in mammalian brains and plays crucial roles in many neural functions. In contrast, Neu5Gc is present only at a trace level in vertebrate brains. The brain-specific suppression of Neu5Gc synthesis, which is a common feature in mammals, s...

Stimulation of(14C)serotonin synthesis from (14C)tryptophan by mescaline in rat pineal organ cultures.

substrate. Mescaline does not inhibit the deandnation of [14C] serotonin to 5-hydroxyindoleacetic acid and has no significant effect on the intracellular content of [14C] tryptophan or its conversion to [14G] protein. It is • 14 concluded that mescaline stimulates p_ne;¢l [ C] serotonin synthesis via a primary stimula£ory action on the enzymatic conversion of [14.C]tryptophan to 5-hydroxytrypto...