title: Soil Unfractionated: labeled with 13C-Lac  at timepoint 3 BD NA
design: DNA-SIP fractions samples fractionated from CsCl gradient while  unfractionated were just DNA extracts, PCR with V4 16S rRNA primers, gel  cleanup, then up to 192 samples sequenced together with dual barcodes in  Illumina MiSeq 2x250 V2 chemistry.