Long-term continuous cultivation of Clostridium beijerinckii in a two-stage chemostat with on-line solvent removal

Article Abstract:

The use of a membrane evaporation module in the long-term continuous cultivation of Clostridium beijerinckii in a two stage chemostat improves the production of neutral solvents and the utilization of substrates. The solvent productivity and yield increases by about 40%. The membrane decreases the metabolic oscillations which exist in a continuous culture. It also decreases the solvent concentration, increasing fermentation. High water entry through the membrane increases salt concentration, which leads to cell degeneration.

Analysis, Observations, Clostridium, Cultures (Biology), Solvents

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Relationship between acid tolerance, cytoplasmic pH, and ATP and H+-ATPase levels in chemostat cultures of Lactococcus lactis

Article Abstract:

Several types of bacteria have been discovered to possess inherent capabilities towards acid tolerance response (ATR). This was done using batch cultures of Lactococcus lactis. The bacteria cultures were given mild exposure to acids. The cultures were later able to withstand higher concentrations of acid as the pH level of the invading acid was slowly being manipulated. This acquired acid tolerance was possible through an inherent mechanism within the bacteria that involved protein synthesis.

Physiological aspects, Bacteria, Molecular biology, Adenosine triphosphate, ATP

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A study of deep-sea natural microbial populations and barophilic pure cultures using a high-pressure chemostat

Article Abstract:

Deep-sea natural microbial populations and barophilic pure cultures have been studied through use of a high-pressure chemostat. The study was to find out about how natural deep-sea populations and barophilic pure cultures react to unvarying growth-limiting concentrations of organic carbon under elevated hydrostatic pressure conditions. Pressure and dilution rate changes were studied. Results suggest that deep-sea microbes can respond to small variations in nutrient availability.

United States, Statistical Data Included, Environmental aspects, Marine bacteria, Cytochemistry, Benthos, Benthic zone, Marine microbiology

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