Urea as a nitrogen source for thiobacilli

Urea as a source of nitrogen for the biosynthesis of amino acids.

Urea has long been recognized as the principal end product of nitrogenous metabolism in mammals. In recent years, the possibility that monogastric animals might be able to decompose this substance, when administered preformed, has stimulated considerable interest. The presence of radioactive carbon dioxide in the expired air after the injection of urea labeled with Cl4 indicates that decomposit...

Residue of horse serum purification as a nitrogen source for growth of microorganisms, l-Clostridia

Insects as a Nitrogen Source for Plants

Many plants have evolved adaptations in order to survive in low nitrogen environments. One of the best-known adaptations is that of plant symbiosis with nitrogen-fixing bacteria; this is the major route by which nitrogen is incorporated into plant biomass. A portion of this plant-associated nitrogen is then lost to insects through herbivory, and insects represent a nitrogen reservoir that is ge...

Isolation of a strain of Agrobacterium tumefaciens (Rhizobium radiobacter) utilizing methylene urea (ureaformaldehyde) as nitrogen source.

Methylene ureas (MU) are slow-release nitrogen fertilizers degraded in soil by microbial enzymatic activity. Improved utilization of MU in agricultural production requires more knowledge about the organisms and enzymes responsible for its degradation. A Gram-negative, MU-degrading organism was isolated from a soil in Sacramento Valley, California. The bacterium was identified as Agrobacterium t...

Horse serum purification residue as a nitrogen source for the growth of microorganisms, II-Corynebacterium diphtheria (Toxin Production)