Welhave!reported previously (Christman and Williams, 1952) concerning the synthes of a specific activator for aspartic acid deaminase by the sulfuric acid degradation of carbohydrates. The immediate conclusion arising from this observation was that biotin and adenylic acid could not be constituents of the "coenzyme" although the mode of action of the enzyme system and its activators remained to...

A linear correlation was established between aspartic acid racemization ratio from cave bear dentine collagen and absolute dating. The high correlation coefficient obtained allowed age calculation through amino acid racemization. Aspartic acid and glutamic acid racemization kinetics have also been explored in dentine from a North American black bear (Ursus americanus Pallas). Three sample sets ...

The metabolism of (14)C-labeled aspartic acid, diaminopimelic acid, malic acid and threonine by isolated pea (Pisum sativum L.) chloroplasts was examined. Light enhanced the incorporation of [(14)C] aspartic acid into soluble homoserine, isoleucine, lysine, methionine and threonine and protein-bound aspartic acid plus asparagine, isoleucine, lysine, and threonine. Lysine (2 millimolar) inhibite...

1. Amino acid metabolism and protein synthesis in a Staphylococcus aureus mutant strain that requires pyrithiamine for optimum growth were studied and compared with those in the thiamine-requiring parent S. aureus. 2. The mutant strain utilized amino acids at a higher rate than did the parent strain. The utilization of glutamic acid, serine and glycine was much stimulated in the mutant strain. ...

In this paper S, X denote non empty sets and R denotes a binary relation on X . We introduce orthorelational structures which are extensions of relational structure and ComplStr and are systems 〈 a carrier, an internal relation, a complement operation 〉, where the carrier is a set, the internal relation is a binary relation on the carrier, and the complement operation is a unary operation on th...