Lecture16 - Microbial Interactions Interspecies Hydrogen...

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Microbial Interactions Interspecies Hydrogen Transfer The interaction between hydrogen producing and hydrogen utilizing species has a significant regulatory effect on rumen fermentation. Hydrogen does not accumulate in the rumen because it is used by methanogenic bacteria to reduce CO 2 to CH 4 . The effective removal of hydrogen by these methanogenic bacteria reduces the hydrogen concentration in the rumen and encourages hydrogen producing bacteria to produce more hydrogen.
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Microbial Interactions Interspecies Hydrogen Transfer Methanogenic bacteria are termed autotropic bacteria meaning that they use CO 2 taken up from their growth environment as the carbon substrate for their growth. The CO 2 that autotrophic bacteria use is waste from the metabolism of heterotropic bacteria living in the growth environment. The carbon needs of heterotropic bacteria are derived from organic nutrients which they take up from the growth environment. These organic nutrient growth substrates include monosaccharides (released by hydrolysis from the host ruminant's feed carbohydrate)
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