Archives of Microbiology

, Volume 107, Issue 1, pp 75–80 | Cite as

Effect of temperature on the viability of Bacillus stearothermophilus

  • Shuichi Hashizume
  • Takeshi Sekiguchi
  • Yoshiaki Nosoh


One of the obligate thermophilic bacteria, Bacillus stearothermophilus, was unable to grow at temperatures below 35° C. About 80% of the population in the bacterial culture died at the temperatures, and the same extent of loss in either of the activities of oxygen consumption or synthesis of protein or nucleic acid of the organisms was observed. With the progress of death of the organisms, reduced nicotinamide-adenine dinucleotide came to be oxidized by the organisms, enzymes such as fructose-1,6-diphosphate aldolase, when the organisms were washed with phosphate buffer, were leaked out of the organisms, and an increasing amount of ribonucleoprotein was released into the culture medium. The change of the membrane state was then suggested to be one of the possible causes for the death of the organisms at the temperatures.

Key words

Thermophilic bacteria Obligate thermophile B. stearothermophilus Loss of viability Leakage of ribonucleoprotein Low temperatures 


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Copyright information

© Springer-Verlag 1976

Authors and Affiliations

  • Shuichi Hashizume
    • 1
  • Takeshi Sekiguchi
    • 1
  • Yoshiaki Nosoh
    • 1
  1. 1.Laboratory of Chemistry of Natural ProductsTokyo Institute of TechnologyTokyoJapan

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