Abstract:
:The role of light as an energy source for slightly aereated cultures of halobacteria was studied, using continuous cultures with low nutrient concentrations and a low oxygen supply. A series of experiments were carried out with non-illuminated and differently illuminated cultures and with different oxygen transfer rates. Under low oxygen availability, light proved to be a decisively important energy source that allowed the populations to reach higher growth rates and much higher population densities. Oxygen influenced the growth over only a minimal level, below which neither the illuminated nor the dark cultures were affected by the oxygen transfer rate. From these results, it appears that the bacteriorhodopsin-mediated energy supply could have a very important role for the ecology of halobacteria in their microaerophilic habitats. In the illuminated cultures, cells that originated purple colonies on plates appeared. These cells, which could be bacteriorhodopsin-constitutive mutants, are now being studied.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Rodriguez-Valera F,Nieto JJ,Ruiz-Berraquero Fdoi
10.1128/AEM.45.3.868-871.1983keywords:
subject
Has Abstractpub_date
1983-03-01 00:00:00pages
868-71issue
3eissn
0099-2240issn
1098-5336journal_volume
45pub_type
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