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• W1990663404 abstract "Invariance of culture conditions in steady state continuous cultures make these a very valuable tool to study the influence of various culture parameters on cell growth and synthesis of primary and secondary metabolites. The result of a parametric study on production of protease in continuous suspension cultures of Bacillus firmus NRS 783 are reported in this article. This strain is a superior producer of an alkaline protease with major application in the detergent industry. The parameters investigated include dilution rate and concentrations of yeast extract, ammonium, and inorganic phosphate in the bioreactor feed, glucose being the principal carbon source in all experiments. The regulatory effects of the key culture parameters on cell growth, synthesis and secretion of protease, and production of acetic acid are investigated. The relations among the specific cell growth rate, specific utilization rates of the principal carbon, nitrogen, and phosphorous sources, and specific production rates of two nonbiomass products, viz., acetic acid and protease, are examined, and the effects of the manipulated culture parameters on these relations, specific protease activity, and yields of cell mass, protease, and acetic acid on the basis of the principal carbon, nitrogen, and phosphorous sources are studied. An increase in dilution rate led to increases in specific utilization rates of the principal carbon, nitrogen, and phosphorous sources and specific production rates of acetic acid and protease and decreases in bulk activities/concentrations of the three products (acetic acid, cell mass, and protease). As a result, the productivities of the three species were maximized at an intermediate dilution rate. Increased supply of yeast extract (a rich source of amino acids, proteins, and vitamins, besides being an additional source of carbon, nitrogen, and phosphorus) promoted cell mass formation but reduced protease production per unit cell mass. Increased supply of nitrogen and phosphorous sources stimulated protease synthesis up to certain threshold levels and repressed the enzyme synthesis beyond the threshold levels. With increased supply of the nitrogen source, the phosphorous source was more efficiently utilized for cell growth and protease synthesis. Stable maintenance of continuous cultures of B. firmus over prolonged period is demonstrated in this study. © 1993 John Wiley & Sons, Inc." @default.
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• W1990663404 date "1993-01-05" @default.
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• W1990663404 title "Some observations on protease production in continuous suspension cultures ofBacillus firmus" @default.
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• W1990663404 doi "https://doi.org/10.1002/bit.260410107" @default.
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