ISSN:
1432-072X
Keywords:
Autotrophic growth
;
Hydrogen
;
Carbon monoxide
;
Gram-negative hydrogen bacteria
;
Pseudomonas carboxydovorans
;
Facultative autotrophs
;
CO oxidation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract From enrichment cultures four carbon monoxide utilizing bacteria were isolated; strain OM5 isolated from waste water was studied in detail. The cells are Gram-negative, slightly curved rods, motile by a single subpolarly inserted flagellum. The colonies are smooth, translucent and not slimy. The cells are able to grow autotrophically in mineral medium under an atmosphere of 40% CO, 5% O2 and 55% N2 at a doubling time of 20h (30°C) or of 85% H2, 5% O2 and 10% CO2 at a doubling time of 7h. Heterotrophic growth occurrd on organic acids such as acetate (t d =8h), pyruvate (t d =8h), lactate, crotonate, malate, succinate (t d =8h), formate (t d =35h) and glyoxylate as substrates. The enzyme system for carbon monoxide utilization is formed only during growth on CO; hydrogenase is present in cells grown on CO or on H2+CO2 as well as grown on pyruvate. The rate of oxygen reduction by intact CO-grown cells is 3.7-fold higher in the presence of hydrogen than in the presence of carbon monoxide. During growth the stoichiometry of gas uptake was 6.1 CO+2.8 O2+H2O → 〈CH2O〉+5.1 CO2. For the new isolate the name Pseudomonas carboxydovorans (Kistner) comb. nov. has been proposed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00406071
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