Use of 31P nuclear magnetic resonance spectroscopy and electron microscopy to study phosphorus metabolism of microorganisms from wastewaters

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Abstract
We used 31P nuclear magentic resonance to study the transfer of phosphorus between Pis and polyphosphates in microorganisms involved in wastewater treatment. We showed that the transfer process is reversible and of the first order in accordance with the polyphosphate concentration. The presence of nitrates in the anoxic phase led to results similar to those obtained during the aerobic phase. (Anoxic implies absence of oxygen but presence of nitrate, whereas anaerobic implies absence of oxygen and nitrate. In bacteriology, the term anoxic is not common, and the term anaerobic implies absence of oxygen and includes the conditions under which nitrate is present.) We observed that carbon dioxide lowers the pH, which entails a hydrolysis of polyphosphates, and helium seems to stop the evolution of the cells. Further, 2,4-dinitrophenol decouples the oxidative phosphorylation and brings about a decrease in the polyphosphate pool.