Article Abstract:
The effects of polyamines on the acidity and osmotic tolerance of the physiology of agronomically important microorganisms were evaluated. Strains of Rhizobium fredii and Bradyrhizobium japonicum were subjected to acid-stressed conditions. Sodium chloride, potassium chloride, sucrose and glycerol were used as osmotic agents. Differences between the two strains were linked to their transportation of inorganic cations and their metabolization of cellular homspd.
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Article Abstract:
Low oxygen concentrations can trigger a remarkable transformation of membrane chemistry in free-living Bradyrhizobium japonicum. Under normal aeration, the major lipid species was found to be phosphatidylcholine. In contrast, phosphatidylethanolamine replaced phosphatidylcholine as the major lipid once conditions became microaerobic. In addition to this, synthesis of phosphatidylinositol was also observed.
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Article Abstract:
A study was conducted to analyze an NAD-malic enzyme purified to homogeneity from Bradyrhizobium japonicum A1017. The molecular properties of the enzyme was also examined. The role of the enzyme in the carbon metabolism of bacteroids was then discussed. Results indicated that the enzyme supported native and subunit molecular masses of 388 and 85 kDa. Findings also showed that it exists as a homotetramer.
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