Effect of amino acids on the heat production and growth efficiency of Streptococcus bovis: balance of anabolic and catabolic rates

Article Abstract:

The growth yields of streptococcus bovis is increased by the addition of an amino acid source (7), and this stimulation is due to a better balance of catabolic and anabolic rates which decrease the loss of metabolic energy as heat. When an ammonia based medium is supplemented with amino acids, streptococcus bovis JBI has a 40% greater growth yield (18 versus 12.5 mg of protein per Mmol of glucose) and grows almost twice as fast (0.9 Versus 1.6 h-1). The specific rate of heat production (2.1m W/mg of protein) and glucose consumption rate (88 mu mol mg of protein-1 h-1) remained unaffected.

Growth

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The intracellular pH of Clostridium paradoxum, an anaerobic, alkaliphilic, and thermophilic bacterium

Article Abstract:

The intracellular pH of Clostridium paradoxum, an anaerobic alkalithermophile, increases with an increase in external pH, when the external pH is greater than 10.0. However, the growth of the bacteria stops when the external pH becomes greater than 10.2 and the intracellular pH attains the value of 9.8. The pH gradient across the cell membrane (delta-pH) increases by 1.3 U when the extracellular pH increases from 7.6 to 9.8. However, both delta-pH and the membrane potential decrease when the extracellular pH becomes greater than 10.0.

Measurement, Bacteria, Thermophilic, Clostridium, Hydrogen-ion concentration, pH measurement, Thermophiles

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Nisin resistance of Streptococcus bovis

Article Abstract:

Streptococcus bovis can become resistant to nisin, which is a food preservative that creates pores in bacterial membranes. This resistance may be caused by increased levels of lipoteichoic acid in the bacterial cell.

Food, Protection and preservation, Drug resistance in microorganisms, Microbial drug resistance, Food preservation

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