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  • 1
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary A population of mixed rumen bacteria was maintained in a chemostat at four different dilution rates, with glocose as the growth limiting carbon and energy substrate. Increasing the dilution rate shifted the proportions of end products: methane decreased and propionate increased. Fermentation and hydrogen balances were calculated from the fermentation end products. Values were similar to earlier ones from batch incubations of rumen contents. This suggests that theoretical overall reaction schemes for carbohydrate fermentation in the rumen, proposed earlier, are also valid in continuous culture. A positive correlation between dilution rate and microbial growth efficiency (gNinc./kg OMf was observed, confirming earlier work. Apparently conflicting results of chemostat work and recent in vivo experiments are discussed.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Methane production in pure cultures ofMethanobacterium ruminantium andMethanobacterium M.o.H. strains is inhibited by halogenated methane analogues in Μm concentrations and by unsaturated long-chain fatty acids or sulfite inmm concentrations. With the long-chain fatty acids a free carboxyl group is required for the depressing effect on methanogenesis, while the toxicity is increased with a higher degree of unsaturation of these acids. The direct toxic effect of these compounds on methane bacteria in pure cultures is in accord with earlier observations regarding their effect on the mixed rumen microbes.
    Type of Medium: Electronic Resource
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