Adjustments in bacterial reaction systems I. The reducing power of Bact. ladis aerogenes under various conditions | Zendy

P. R. Lewis | Zendy; Cyril Norman Hinshelwood | Zendy

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Adjustments in bacterial reaction systems I. The reducing power of Bact. ladis aerogenes under various conditions

Author(s) -

P. R. Lewis,

Cyril Norman Hinshelwood

Publication year - 1948

Publication title -

proceedings of the royal society of london a mathematical and physical sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.814

H-Index - 135

eISSN - 2053-9169

pISSN - 0080-4630

DOI - 10.1098/rspa.1948.0097

Subject(s) - anaerobic exercise , nitrate , chemistry , aeration , ammonium , nitrogen , inorganic chemistry , pulp and paper industry , biology , physiology , organic chemistry , engineering

The reducing power of cells ofBact. lactis aerogenes has been measured by dye reduction tests with resting and with growing cultures in media containing as nitrogen sources ammonium salts or nitrate, and under aerobic and anaerobic conditions. Changes in growth rate have been correlated with changes in the reducing power accompanying transitions from one medium to the other or from anaerobic to aerobic conditions and vice versa. Two types of adjustment play a part in the observed phenomena: (a) rapid changes in concentrations of active intermediates, (b) slow adaptive modifications of enzyme systems in response to needs of the cell. The former are exemplifiedinter alia by the rapid fall in reducing power and growth rate when an anaerobic nitrate culture is aerated. The latter include the development of extra reducing power when the cell has to use nitrate as a source of nitrogen and of still more when the nitrate has to be reduced in presence of oxygen.

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