Autotrophic and heterotrophic metabolism of Hydrogenomonas. I. Growth yields and patterns under dual substrate conditions.

Abstract:

:Auxotrophic mutants of Hydrogenomonas eutropha and H. facilis requiring utilizable amino acids were employed to demonstrate the simultaneous utilization of H(2) and an organic substrate for growth. The ratio of the cell yields under dual substrate conditions compared to heterotrophic conditions indicated the relative contributions of the autotrophic and heterotrophic systems to the growth of the organism. Wildtype H. eutropha grown under simultaneous conditions exhibited a dicyclic growth pattern, the first cycle representing either heterotrophic or simultaneous growth and the second cycle representing autotrophic growth. The duration of the changeover period was either very short with no plateau or long with a plateau up to 8 hr, depending upon the organic substrate. The growth rate under simultaneous conditions with some organic substrates was faster than either the autotrophic or heterotrophic rate, but was not the sum of the two rates. The data suggest that, in the presence of both organic and inorganic substrates, heterotrophic metabolism functions normally but autotrophic metabolism is partially repressed.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

DeCicco BT,Stukus PE

doi

10.1128/JB.95.4.1469-1475.1968

subject

Has Abstract

pub_date

1968-04-01 00:00:00

pages

1469-75

issue

4

eissn

0021-9193

issn

1098-5530

journal_volume

95

pub_type

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