Parveen Tripathi

Investigation of cerium and yttrium ions effects on microbial nitrogen fixation and determination of inhibition

Critical investigation of the effect of yttrium and cerium ions in culture media for nitrogen-fixing bacteria showed strong inhibition. There was a decrease in the amount of nitrogen fixed; simultaneously, in the samples containing cerium ions, carbon consumption values increased as the molarity of metal ion was enhanced. Inhibition rate was invariably maximum at the highest concentration of metal ions.

Activatory Effect of some Rare Earths on Microbial Nitrogen Transformations

Summary Lanthanum sulphate induced enhancement of nitrogen fixation by bacteria. The carbon consumption rate was similarly increased. In three microbial specimen the rate of mg. nitrogen fixed per g. carbon consumed was greater in presence of the metal ion, while in one case the rate decreased appreciably. Praseodymium sulphate inhibited the nitrogen fixation values in one sample, while three specimen showed activation. Appreciable increase in respiratory rate was perceived in all the cases studied. Inhibition was apparent in data of nitrogen fixed/carbon consumed. Lanthanum ions clearly acted as promotors in nitrogen fixing bacteria.

Organic Acids Produced by Self-Sustaining Coacervates in Presence of p-Nitroaniline and p-Phenylene-Diamine

Oleic and malonic acids were found in control samples while p-nitroaniline addition induced production of tricarballylic acid in eight and twelve days exposed samples. Fumaric and citric acids were found in sporadic instances. Addition of p-phenylene diamine to the mixture showed a degeneration process in organic acid production. In some cases production of fumaric acid was positive.

Detergent effect on metabolic changes in microorganisms. A review.

Detergents contain a hydrophobic hydrocarbon structure and a hydrophilic group which may be anionic, cationic, or neutral. Detergents form stable emulsions and are capable of trapping lipid-soluble materials in the interior of the hydrophobic portion of the miscelles. Application of the knowledge of detergents to the discipline of microbiology would provide interesting and accurate data for further studies.

Amino acid changes in abiogenic mixtures containing p-nitro aniline and p-phenylene diamine

Mixtures containing diammonium hydrogen phosphate, ammonium molybdate, and minerals in presence of p-nitroaniline resulted in formation of glycine, methionine, phenylalanine, tryptophan, and tyrosine. Proline and valine were observed in a few tubes. When p-phenylene diamine was present in the mixture, glycine was absent, while isoleucine and leucine were observed in the tubes. Predominance of proline was observed in all the studies executed.

Nitrogen fixation by microbial cultures with sodium salt of organic acids as carbon source.

The best source of carbon, when used as the sodium salt of organic acids, is sodium salicylate which shows highest nitrogen fixation and also appreciably large amounts of nitrogen fixed per g carbon consumed. Next in order is sodium benzoate, then oxalate. Sodium citrate is followed by sowium acetate in the order of decreasing efficiency.

Effect of mannitol, sucrose, and glucose on bacterial nitrogen fixation.

Summary The data of the nitrogen fixed per g. carbon consumed indicate highest efficiency in the presence of mannitol, then glucose, and finally sucrose.