Factors affecting growth and nitrogen fixation of Spirillum lipoferum.

Abstract:

:Spirillum lipoferum grows vigorously on malate, succinate, lactate, or pyruvate, moderately on galactose or acetate, and poorly on glucose or citrate. It reduces 15N2. Acetylene reduction rates decrease rapidly when the pH of the culture rises above 7.8. The organism is highly aerobic and had doubling times as low as 2 h when grown on NH4+. However, S. lipoferum reduces N2 well only under microaerophilic conditions. The optimal pO2 for acetylene reduction by stagnant cultures was 0.006 to 0.02 atm depending upon the cell density; aerated cultures grew well at dissolved O2 concentration corresponding to a pO2 of about 0.008 atm. Shaking S. lipoferum with air temporarily inactivates its nitrogenase; reactivation is inhibited by chloramphenicol. The organism assimilated 20 to 24 mg of N/g of organic acid oxidized during growth. The strains studied can be placed in two groups based upon their morphology and physiological characteristics.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Okon Y,Albrecht SL,Burris RH

doi

10.1128/JB.127.3.1248-1254.1976

subject

Has Abstract

pub_date

1976-09-01 00:00:00

pages

1248-54

issue

3

eissn

0021-9193

issn

1098-5530

journal_volume

127

pub_type

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