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Biomedical subjects

I P Ting

Publications and source records attributed to I P Ting.

At least 19 recordsLinked to original sources
PubMed1977

Nitrogen fixation, denitrification, and pleomorphic growth in a highly pigmented Spirillum lipoferum.

A strain of Spirillum lipoferum with intense red pigmentation was isolated from the roots of Cynodon dactylon "Coastal." This isolate vigorously reduced acetylene when grown in N-free, Na-malate, semisolid agar, and it was identical to S. lipoferum strain SP7 by standard taxonomic tests. Both S. lipoferum SP7 and the C. dactylon root isolate displayed the unique features of being denitrifiers as well as N2 fixers. The N2-dependent growth curve was biphasic: cells in younger cultures showed the characteristic spiral shape and motility, but those in older cultures developed larger, nonmotile, cystlike forms. Nitrogenase activity seemed associated only with younger spiral forms. The red pigment may be a b- or c-type cytochrome. The strong red color, which this strain develops, could be used as a marker in evaluating soil inoculation experiments.

Acetylene↗
PubMed1970

Asparagine biosynthesis by cotton roots. Carbon dioxide fixation and cyanide incorporation.

Asparagine is the dominant amino acid in cotton root tips (Acala SJ-1). Two biosynthetic pathways may be operative. First, asparagine is an ultimate product of nonphotosynthetic CO(2) fixation. Whereas short term (14)CO(2) labeling experiments indicate that malate is the predominant product, asparagine appears exponentially and does not appear to be in an active metabolic pool. Other products labeled with (14)CO(2) are citrate, aspartate, and glutamate. No neutral components are labeled. Secondly, asparagine is synthesized via a pathway starting with cyanide. Major amino acid products labeled with (14)CN(-) are beta-cyanoalanine and asparagine. Similarly to CO(2) fixation, asparagine synthesized from cyanide is not in an active metabolic pool. Other products labeled include anion and neutral components. The exact nature of the latter is not known.

Asparagine↗