Redox poise and oxygenation of cytochrome bd in the diazotroph Azotobacter vinelandii assessed in vivo using diode-array reflectance spectrophotometry

Article Abstract:

The effects of O2 supply on the redox poise and in vivo oxygenation of cytochromes b, d, and c of Azotobacter vinelandii were explored using a modified diode-array spectrophotometer. Alterations in O2 supply resulted in changes in the absorbance attributed to cytochromes b, c and d. Moreover, three states of cytochrome d were observed in washed cell suspensions. The findings suggest that the oxygenated form of cytochrome d in the one-electron reduced cytochrome bd-type oxidase is not involved in enzyme turnover.

Oxygen, Reflectance spectroscopy, Cytochromes

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Microbial ubiquinones: multiple roles in respiration, gene regulation and oxidative stress management

Article Abstract:

Advances in the understanding of the function and structure of such membrane-bound protein complexes as quinones have shed light regarding their roles in photosynthetic electron-transport chains and in respiration. Further studies and their wide distribution throughout the animal cellular structure have led to the conclusion that, instead of acting as mere reduction-oxidation carriers, these protein complexes also play crucial roles in such areas as oxidative stress management and gene regulation.

Gene expression, Oxidation-reduction reaction, Oxidation-reduction reactions, Electron transport, Ubiquinones

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Cyanide inhibits respiration yet stimulates aerobic growth of zymomonas mobilis

Article Abstract:

Results demonstrate that in chemostat aerobic cultures of Zymomonas mobilis potassium cyanide promoted biomass production. Data indicate that this growth stimulation is due to the production inhibition of the growth inhibitory acetaldehyde under decreased respiration caused by cyanide.

United Kingdom, United States, Latvia, Statistical Data Included, Physiological aspects, Growth, Bacteria, Aerobic, Aerobic bacteria, Respiration, Cyanides, Acetaldehyde

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