Reversible heat injury in the marine psychrophilic bacterium <i>Vibrio marinus</i> MP-1

Griffiths, Robert P.; Haight, Roger

doi:10.1139/m73-092

Cited by 15 publications

(6 citation statements)

References 4 publications

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“…The results relating to growth phase and heat resistance are in agreement with many previous articles (Beuchat and Lechowich 1968;Kenis and Morita 1968;Griffiths and 1973;Hurst et al 1974). In this case, however, it is not clear if the increase in resistance can be wholly accounted for by the explanations proposed regarding changes in cell physiology such as the reduced amount of replicating DNA (Mirhabibollahai 1988), or whether the exposure to gradual increases in acidity conferred an increased resistance to cells incubated for 24 h. The phenomenon of acid shock-induced thermotolerance has previously been reported in Listeria monocytogenes (Farber and Pagotto 1992).…”

Section: Discussionsupporting

confidence: 92%

Inducible thermotolerance in Lactobacillus bulgaricus

Teixeira

Castro

Kirby

1994

Lett Appl Microbiol

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The effect of a sublethal heat challenge on the subsequent thermotolerance of Lactobacillus bulgaricus at different stages of growth was investigated along with the effect of heating menstrum on survival. The response of the cells to heat stress was shown to be dependent upon both cell age and heating menstrum. Heat‐inducible thermotolerance could be provoked in cells which had been growing exponentially when they were subjected to the sublethal heat stress: pre‐incubation at 10°C above the optimum growth temperature. The same effect could not, however, be reproduced in cells taken from the stationary phase. Cells from the stationary phase were shown to always be more thermotolerant as compared to exponential phase cells. Cells showed a greater thermotolerance when heated in milk as compared to buffer.

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Section: Discussionsupporting

confidence: 92%

Inducible thermotolerance in Lactobacillus bulgaricus

Teixeira

Castro

Kirby

1994

Lett Appl Microbiol

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“…A comparison of heat resistance at 55°C and 60°C of log phase and late stationary phase cultures grown at 37°C confirmed that late stationary phase cultures had greater heat resistance ( Fig. 1) as seen earlier in E. coli O157 (Todd et al 1993) and many other bacteria (Beuchat and Lechowich 1968 ;Griffiths and Haight 1973 ;Hurst et al 1974).…”

Section: Resultssupporting

confidence: 65%

Factors affecting the heat resistance of Escherichia coli O157 : H7

Kaur¹,

Ledward

Park³

et al. 1998

Letters in Applied Microbiology

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Escherichia coli O157:H7 has been reported as being not particularly heat resistant. However, several factors which might increase its heat resistance have been investigated in this study using five strains. Increase in growth temperature to 40 degrees C, as found in the cow gut, heat-shock at sub-lethal temperatures of 42, 45, 48 and 50 degrees C, and variable heating rate (1 degree C min-1 to 23 degrees C min-1) had no dramatic effect on heat resistance. Growth phase had a marked impact on heat resistance; late stationary phase cells were more heat-resistant than were log phase cells. The difference in heat resistance between the two phases of growth became more pronounced when cells were resuspended in fresh nutrient broth; heat resistance of late stationary phase cells increased dramatically whereas no such effect was observed with log phase cells. The addition of polyphosphates to the heating medium did not increase heat resistance. A reduction in water activity of the heating medium from 0.995 to levels between 0.980 and 0.960 also resulted in a marked increase in heat resistance. This effect was more pronounced under conditions of extremely low water activity created by resuspending late stationary phase cells in sunflower oil. Survivors were detected even after a heat treatment at 60 degrees C for 1 h or 70 degrees C for 5 min. It can be confirmed that this serotype has no unusual heat resistance and that the heating environment markedly affects resistance.

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“…nonreversible injury or death (67). Recovery of the reversible injury of the cells depends on the recovery medium.…”

Section: Physiology Of Psychrophilesmentioning

confidence: 99%