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  • 1
    Electronic Resource
    Electronic Resource
    Electrogenic sodium ion/proton antiport in Desulfovibrio vulgaris (1983)
    Springer
    Archives of microbiology 136 (1983), S. 69-73 
    Details
    ISSN: 1432-072X
    Keywords: Desulfovibrio vulgaris ; Sodium transport ; Na+/H+ antiport ; Dissimilatory sulfate reduction ; Sulfate transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Entry of sodium ions into cells of Desulfovibrio vulgaris was studied. Translocation of Na+ was monitored by following the optical changes associated with shrinkage and swelling of the cells upon exposure to a hyperosmotic solution (200 mM) of sodium acetate or of sodium thiocyanate. By this technique the two solutes were found to equilibrate only after the addition of a protonophore such as carbonylcyanide m-chlorophenyl-hydrazone (CCCP). It was confirmed that acetate permeates electroneutrally as CH3COOH and thiocyanate electrogenically as SCN-. These findings suggest that Na+ is translocated by an electrogenic sodium ion/hydrogen ion antiport mechanism (H+/Na+〉1). Consistent with this interpretation is the observation that the addition of sodium acetate to a cell suspension resulted in the generation of a membrane potential (inside negative) and that of NaCl in an acidification of the external medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00415613
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  • 2
    Electronic Resource
    Electronic Resource
    Different Ks values for hydrogen of methanogenic bacteria and sulfate reducing bacteria: An explanation for the apparent inhibition of methanogenesis by sulfate (1982)
    Springer
    Archives of microbiology 131 (1982), S. 278-282 
    Details
    ISSN: 1432-072X
    Keywords: Desulfovibrio vulgaris ; Methanobrevibacter arboriphilus ; Ks values for H2 ; Methanogenesis ; Sulfate reduction ; Competition for H2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Desulfovibrio vulgaris (Marburg) and Methanobrevibacter arboriphilus (AZ) are anaerobic sewage sludge bacteria which grow on H2 plus sulfate and H2 plus CO2 as sole energy sources, respectively. Their apparent Ks values for H2 were determined and found to be approximately 1 μM for the sulfate reducing bacterium and 6 μM for the methanogenic bacterium. In mixed cell suspensions of the two bacteria (adjusted to equal V max) the rate of H2 consumption by D. vulgaris was five times that of M. arboriphilus, when the hydrogen supply was rate limiting. The apparent inhibition of methanogenesis was of the same order as expected from the different Ks values for H2. Difference in substrate affinities can thus account for the inhibition of methanogenesis from H2 and CO2 in sulfate rich environments, where the H2 concentration is well below 5 μM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00405893
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  • 3
    Electronic Resource
    Electronic Resource
    Growth yields and saturation constant of Desulfovibrio vulgaris in chemostat culture (1984)
    Springer
    Archives of microbiology 137 (1984), S. 236-240 
    Details
    ISSN: 1432-072X
    Keywords: Desulfovibrio vulgaris ; Dissimilatory sulfate reduction ; Growth yields ; Chemostat cultures ; Pyruvate metabolism ; ATP synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Desulfovibrio vulgaris (strain Marburg) was grown on H2 and sulfate as sole energy source in a chemostat limited by the sulfate supply. The biomass concentration and the sulfate concentration in the culture were determined as a function of the dilution rate. From the data a K S (saturation constant) for sulfate of 10 μM, a μmax of 0.23 h−1, and a $${\text{Y}}_{{\text{SO}}_{\text{4}} ^{2 - } }^{{\text{max}}}$$ of 13 g/mol were calculated. The organism was also grown in chemostat culture on H2 and sulfite, H2 and thiosulfate, and pyruvate (without sulfate). $${\text{Y}}_{{\text{SO}}_3 ^{2 - } }^{{\text{max}}}$$ was found to be 35 g/mol, $${\text{Y}}_{{\text{S}}_{\text{2}} {\text{O}}_{\text{3}} ^{2 - } }^{{\text{max}}}$$ 36 g/mol, and Y pyr max 10 g/mol. The growth yields are discussed with respect to ATP gains in dissimilatory sulfate reduction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00414550
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  • 4
    Electronic Resource
    Electronic Resource
    Lactate conversion to acetate, CO2 and H2 in cell suspensions of Desulfovibrio vulgaris (Marburg): indications for the involvement of an energy driven reaction (1988)
    Springer
    Archives of microbiology 150 (1988), S. 26-31 
    Details
    ISSN: 1432-072X
    Keywords: Lactate oxidation ; Pyruvate oxidation ; H2 formation ; Protonophores ; Dicyclohexylcarbodi-imide ; Arsenate ; Sulfate-reducing bacteria ; Desulfovibrio vulgaris
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cell suspensions of Desulfovibrio vulgaris were found to catalyze, in the absence of sulfate, the complete conversion of 1 lactate to 1 acetate, 1 CO2, and 2 H2 (ΔG′0=-8.8 kJ/mol) and of 1 pyruvate to 1 acetate, 1 CO2, and 1 H2 (ΔG′0=-52 kJ/mol). Protonophores, the proton translocating ATPase inhibitor N,N′-dicyclohexylcarbodiimide, and arsenate specifically inhibited H2 formation from lactate but not from pyruvate. The results suggest that lactate oxidation to pyruvate and H2 (ΔG′ 0=+43.2 kJ/mol) is energy driven.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00409713
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