Dataset: AT26-18_FLOCS_DNA16S

Polished mineral chips were prepared and deployed as described in Fisher et al. 2011 (DOI: 10.2204/iodp.proc.327.107.2011). Mineral colonization experiments were recovered during cruise AT26-18 in August 2014 and processed as described in Orcutt et al. 2011 (DOI: 10.1038/ismej.2010.157). Approximately 6g of each substrate underwent total DNA extraction using the MOBIO PowerSoil® DNA Isolation Kit (MOBIO Laboratories, Inc.) with modification from manufacturer instructions to include a phenol:chloroform:isoamyl alcohol (24:25:1) extraction step. Each batch of samples included procedural blanks. Replicate extracts were pooled and concentrated to 100 μl with vacuum centrifugation (SavantTM DNA SpeedVacTM Concentrator). Concentrated extracts were cleaned with the CleanAll DNA/RNA Clean Up and Concentration Kit (Norgen Biotek Corp, Thorold, Canada) and eluted in 20-50 μl of PCR-grade water. Sequencing of the V1-V3 region of the 16S rRNA gene was performed by Research and Testing Laboratory (Lubbock, TX, USA) using the forward primer 28F (5′- GAG TTT GAT CNT GGC TCA G -3′) and reverse primer 388R (5’- TGC TGC CTC CCG TAG GAG T -3’) for Bacteria using 2 x 300 bp kits on the Illumina MiSeq platform.