
Full text loading...
Deep-sea bacteria were isolated from the digestive tract of animals inhabiting depths of 5900 m in the Puerto Rico Trench and 4300 m near the Walvis Ridge. Growth of two bacterial strains was measured in marine broth and in solid media under a range of pressures and temperatures. Both strains were barophilic at 2 °C (± 1 °C) with an optimal growth rate of 0·22 h-1 at a pressure 30% lower than that encountered in situ. At 1 atm they grew at temperatures ranging from 10·2 to 180·2 °C (± 0·3 °C), while in situ pressures increased the upper temperature limit to 230·3 °C. Both strains were identified as members of the genus Vibrio, based on standard taxonomic tests and mol % G + C values (470·0 and 470·1). Ribonucleotide sequences determined for 5S ribosomal RNA from each strain confirmed relationship to the Vibrio-Photobacterium group, as represented by V. harveyi and P. phosphoreum, but the barophiles were clearly distinct from these species. Secondary structure conformed to the established model for eubacterial 5S rRNA.
Article metrics loading...
Full text loading...
References
Data & Media loading...