We thank Tom Blough for valuable assistance with tensile system upgrade work and integration, Jack Alvarenga for assistance with substrate fabrication development, Ilana Kolodkin for advice and culturing medium and the Professor Losick Lab (Harvard Department of Molecular and Cellular Biology) for use of autoclave facilities. DH was funded by the NSF Research Experience for Undergraduates (REU) program under award no. DMR-0820484. This work was funded in part by the Office of Naval Research under award no. N00014-11-1-0641 and BASF Advanced Research Initiative at Harvard University.