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Applied and Environmental Microbiology, October 1998, p. 3917-3922, Vol. 64, No. 10
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Physiological Activity of Campylobacter
jejuni Far below the Minimal Growth Temperature
Wilma C.
Hazeleger,*
Jeroen A.
Wouters,
Frank M.
Rombouts, and
Tjakko
Abee
Food Science Group, Wageningen University and
Research Centre, NL 6703 HD Wageningen, The Netherlands
Received 15 June 1998/Accepted 3 August 1998
The behavior of Campylobacter jejuni at environmental
temperatures was examined by determining the physiological activities of this human pathogen. The minimal growth temperatures were found to
be 32 and 31°C for strains 104 and ATCC 33560, respectively. Both
strains exhibited a sudden decrease in growth rate from the maximum to
zero within a few degrees not only near the maximal growth temperature
but also near the minimal growth temperature. This could be an
indication that a temperature-dependent transition in the structure of
a key enzyme(s) or regulatory compound(s) determines the minimal growth
temperature. Oxygen consumption, catalase activity, ATP generation, and
protein synthesis were observed at temperatures as low as 4°C,
indicating that vital cellular processes were still functioning. PCR
analysis showed that cold shock protein genes, which play a role in
low-temperature adaptation in many bacteria, are not present in
C. jejuni. The fact that chemotaxis and aerotaxis could be
observed at all temperatures shows that the pathogen is able to move to
favorable places at environmental temperatures, which may have
significant implications for the survival of C. jejuni in
the environment.
*
Corresponding author. Mailing address: Wageningen
University and Research Centre, Department of Food Technology and
Nutritional Sciences, Laboratory of Food Microbiology, Bomenweg 2, NL
6703 HD Wageningen, The Netherlands. Phone: 31-(0)317-484982/482887. Fax: 31-(0)317-484893. E-mail:
wilma.hazeleger{at}micro.fdsci.wau.nl.
Applied and Environmental Microbiology, October 1998, p. 3917-3922, Vol. 64, No. 10
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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