deletions | additions       diff --git a/Discussion.tex b/Discussion.tex  index 9eb2818..32596ec 100644  --- a/Discussion.tex  +++ b/Discussion.tex 
...
\subsection{Microbial response to isotopic labels}  % Fakesubsubsection: We propose that microbial decomposition  DNA-SIP can establish functional roles for thousands of phylotypes in a single  experiment without cultivation. We identified 104 soil OTUs that incorporated $^{13}$C from xylose and/or cellulose into biomass and  characterized substrate specificity and C-cycling dynamics over time. With this  information we can build a conceptual model  for these OTUs. the soil food web with respect  to xylose and cellulose in our microcosms.  We propose xylose and cellulose C added to soil microcosms took the following path through the microbial food web (Figure~\ref{fig:foodweb}): fast-growing \textit{Firmicutes} spore formers first assimilated xylose C followed within 24 hours. Over the next  6 days, the remaining xylose-C and biomass from early-responding  \textit{Firmicutes} was consumed  by \textit{Bacteroidetes}, \textit{Actinobacteria} \textit{Actinobacteria},  and \textit{Proteobacteria} phylotypes.The \textit{Bacteroidetes}, \textit{Actinobacteria} and  \textit{Proteobacteria} phylotypes may have also fed on the early xylose-C  assimilating \textit{Firmicutes}.  Canonical cellulose degrading bacteria such  as like  \textit{Cellvibrio} and members of cosmopolitan yet functionally uncharacterized soil phylogenetic groups like \textit{Chloroflexi}, \textit{Planctomycetes} and \textit{Verrucomicrobia}, specifically the \textit{Spartobacteria}, decomposed cellulose. Cellulose C incorporation into microbial biomass peaked at day 14 and was maintained extended  through day 30. \subsection{Ecological strategies of soil microorganisms participating in the  decomposition of organic matter}