The Influence of Sodium, Potassium, and Ammonium Ions on the Respiration of Azotobacter chroococcum as Related to the Composition of the Growth Medium

1953 ◽  
Vol 17 (3) ◽  
pp. 245-246 ◽  
Author(s):  
C. M. Burns ◽  
John O. Harris







2004 ◽  
Vol 59 (5-6) ◽  
pp. 393-398 ◽  
Author(s):  
Joanna Rejman ◽  
Arkadiusz Kozubek

We studied the effect of exogenous alkylresorcinols on the lipid metabolism of Azotobacter chroococcum. We observed that when 5-n-pentadecylresorcinol was present in the growth medium, the more endogenous alkylresorcinols were synthesized. Concurrently, a drop in the amount of phospholipids was observed. These changes were associated with increasing numbers of dormant cysts, while the number of vegetative cells diminished. The chemical nature of the alkylresorcinols synthesized by Azotobacter chroococcum was dependent on the duration of exposure of the bacteria to exogenous alkylresorcinols. When the exposure time was prolonged to four days, 5-n-nonadecylresorcinol (C 19:0) was substituted by 5-nheneicosylresorcinol (C 21:0) and 5-n-tricosylresorcinol (C 23:0). Two fluorescent membrane probes, NBD-PE and TMA-DPH, further revealed that the presence of alkylresorcinols in the lipid bilayer restrains the phospholipid rotational motion.



Sign in / Sign up

Export Citation Format

Share Document