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both $^{13}$C-xylose and $^{13}$C-cellulose microcosms differ from  corresponding control gradients (Figure~\ref{fig:ord}). These differences from  control gradients are focused in the heavy fractions (Figure~\ref{fig:ord}).  Also, $^{13}$C-DNA from $^{13}$C-xylose microcosms is different in phylogenetic  composition from $^{13}$C-cellulose microcosm $^{13}$C-DNA indicating that  xylose and cellulose were assimilated by different microbial community members  (Figure~\ref{fig:ord}). In general, analysis Analysis  of SSU rRNA gene surveys has greatly benefited from utilizing conventional methods for data exploration  in ecology such as ordination \citep{Lozupone_2008}. SSU rRNA gene  phylogenetic profiles in CsCl gradient fractions have only recently been 
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$^{13}$C incorporation from xylose and cellulose is most apparent at days 1/3/7  and days 14/30, respectively (Figure~\ref{fig:ord}). Moreover, labeled gradient  fraction phylogenetic profiles diverge from controls most dramatically at  relatively heavy buoyant densities (Figure~\ref{fig:ord}). Also apparent Also, $^{13}$C-DNA  from the ordination of CsCl gradient phylogenetic profiles $^{13}$C-xylose microcosms  is that OTUs that incorporated  $^{13}$C different in phylogenetic composition  from $^{13}$C-cellulose into DNA are generally different taxa than OTUs microcosm $^{13}$C-DNA indicating  that incoportated $^{13}$C from $^{13}$C-xylose into DNA. xylose and cellulose were assimilated by different microbial community members (Figure~\ref{fig:ord}).  Lastly, ordination indicates $^{13}$C-xylose responders change in phylogenetic type over incubation days 1, 3   and 7 (Figure~\ref{fig:ord}).  \subsection{$^{13}$C .\subsection{$^{13}$C  from cellulose was assimilated by canonical cellulose-degrading and uncharacterized microbial lineages in many phyla  including Chloroflexi and Verrucomicrobia}   Isotope incorporation by an OTU is revealed by enrichment of the OTU in heavy