Authors: StadtwaldDemchick Rebecca Rudolf Turner F Gest Howard
Publish Date: 1990/09/01
Volume: 71, Issue: 1-2, Pages: 117-121
Abstract
Rebecca StadtwaldDemchick F Rudolf Turner Howard Gest Rhodopseudomonas cryptolactis sp nov a new thermotolerant species of budding phototrophic purple bacteria FEMS Microbiology Letters Volume 71 Issue 12 September 1990 Pages 117–121 https//doiorg/101111/j157469681990tb03808xRhodopseudomonas cryptolactis sp nov was enriched from a hot spring environment using conditions that favor growth of anoxygenic phototrophs able to use N2 as the sole nitrogen source for growth Phototrophic growth rate of the budding bacterium is optimal at ca 40°C and the maximum growth temperature is ca 46°C R cryptolactis requires vitamin B12 nicotinic acid and paminobenzoic acid for optimal growth in synthetic media and has restricted capacities in respect to phototrophic carbon and nitrogen nutrition Molecular nitrogen NH4+ and urea can serve as nitrogen sources pyruvate and lactate as carbon sources Utilization of lactate however is dependent on the presence of bicarbonate suggesting a linkage between lactate photometabolism and operation of the Calvin reductive pentose cycle The photopigments of R cryptolactis including bacteriochlorophyll a are housed in lamellar stacks parallel to and underlying the cell membrane When grown at low light intensity the cells apparently produce an additional species of light harvesting Bchl that has a major in vivo absorbancy peak at 822 nm The bacterium also grows as an aerobic chemoheterotrophs in darkness and the presence of O2 causes severe repression of photopigment synthesis
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