Microbial reduction of manganese and iron: new approaches to carbon cycling

Article Abstract:

The metal-reducing properties of Shewanella putrefaciens group of bacteria from diverse environments are discussed in an environmental perspective. Metals involved are manganese(Mn) and iron(Fe) wherein their redox potentials as electron acceptors in an environment with limited oxygen are utilized. Mn and Fe reduction by S. putrefaciens results in the conversion of organic matter that can diffuse into the environment or interact with other iron groups to form magnetite. This has great potential on the carbon cycling process but the application of laboratory studies in the environment presents a complication due to the many variable factors associated with each different environment.

Manganese, Manganese (Metal), Oxidation-reduction reaction, Oxidation-reduction reactions, Iron, Iron (Metal), Carbon cycle (Biogeochemistry), Carbon cycle

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Dynamics of substrate consumption and enzyme synthesis in Chelatobacter heintzii during growth in carbon-limited continuous culture with different mixtures of glucose and nitrilotriacetate

Article Abstract:

The different carbon substrate mixtures affect the dynamics of the expression of degradative enzymes and give an idea of the regulatory mechanisms in microorganisms under different environmental conditions. A replacement of nitrilotriacetate (NTA) in the growth media with glucose produces a loss of NTA monooxygenase (NTA-MO) in Chelatobacter heintzii. A replacement of glucose with NTA results in a lag phase in the production of NTA-MO and requires about 100 hours for a steady state to be reached. Starved NTA-grown cells lose their NTA-MO and glucose-grown cells fail to produce NTA-MO.

Enzymes, Enzyme synthesis

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Growth kinetics of suspended microbial cells: from single-substrate-controlled growth to mixed-substrate kinetics

Article Abstract:

Research was conducted to examine microbial growth kinetics in relation to the current state, the recent advances and possible future developments in the field of study. Focus was on the growth and growth-linked biodegradation kinetics of suspended heterotrophic cultures where substrates are in bulk liquid. Results indicate that for the description of growth of pure cultures with single growth-controlling substrates under ideal conditions, the kinetic model based on a previous proposal is a solid basis.

Research, Microbial growth, Enzyme kinetics

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