A marine,psychrophilic bacterium of the bacteroidaceae type |
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Authors: | Nils Dyrset Greta Bentzen Tor Arnesen Helge Larsen |
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Institution: | (1) Department of Biochemistry, The Norwegian Institute of Technology, University of Trondheim, NTH, N-7034 Trondheim, Norway |
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Abstract: | A characterization is presented of three strains of bacteria of the bacteroidaceae type, isolated at different times from different samples of fish (capelin) caught in far northern waters, and subsequently stored anaerobically at chill temperatures. The three strains have so many properties in common that they should be considered of the same taxon at the species level. The special feature of the organism that makes it different from all bacteroidaceae, described until now, is first of all its psychrophilic character. The optimum growth temperature is near 15°C, whereas the common bacteriodaceae are listed to have an optimum temperature near 37°C. The new organism is rapidly killed at the latter temperature; at killing temperatures a rupture of the cell envelope takes place. A specific requirement for NaCl supports the notion that the organism is indigenous to the marine environment, and is credibly an inhabitant of the gastrointestinal tract of marine fishes. It needs an almost strict anaerobic environment for growth, but seems able to survive for some time in the presence of air. The latter quality may help the organism to spread and colonize new anaerobic niches.Abbreviations CFU
colony forming units
- GC content
mol% G+C
- PY
peptone-yeast extract
- PYG
PY-glucose
- PYT
PY-threonine
- PYL
PY-lactate
- ESC
extract of spoiling capelin
Dedicated to Professor Dr. H.-G. Schlegel on the occasion of his 60th birthday |
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Keywords: | Anaerobic bacterium Bacteroidaceae Marine bacterium Psychrophile Psychrotroph |
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