Concomitant expression of the acc , acly , and cdhA genes by these phyla suggest that, in addition to chemolithoautotrophy by Gammaproteobacteria ( 82 , 103 ), heterotrophic CO 2 fixation may be significant in the sediment ( 105 ).
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Microbial Activities and Selection from Surface Ocean to Subseafloor on the Namibian Continental Shelf.
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