TY - JOUR T1 - Aggregation and Interaction of Cationic Nanoparticles on Bacterial Surfaces JF - Journal of the American Chemical Society Y1 - 2012 A1 - Hayden, S. C. A1 - Zhao, G. X. A1 - Saha, K. A1 - Phillips, R. L. A1 - Li, X. N. A1 - Miranda, O. R. A1 - Rotello, V. M. A1 - El-Sayed, M. A. A1 - Schmidt-Krey, I. A1 - Bunz, U. H. F. AB - Cationic monolayer-protected gold nanoparticles (AuNPs) with sizes of 6 or 2 nm interact with the cell membranes of Escherichia coli (Gram-) and Bacillus subtilis (Gram+), resulting in the formation of strikingly distinct AuNP surface aggregation patterns or lysis depending upon the size of the AuNPs. The aggregation phenomena were investigated by transmission electron microscopy and UV-vis spectroscopy. Upon proteolytic treatment of the bacteria, the distinct aggregation patterns disappeared. VL - 134 SN - 0002-7863 N1 - Times Cited: 1Hayden, Steven C. Zhao, Gengxiang Saha, Krishnendu Phillips, Ronnie L. Li, Xiaoning Miranda, Oscar R. Rotello, Vincent M. El-Sayed, Mostafa A. Schmidt-Krey, Ingeborg Bunz, Uwe H. F. M3 - 10.1021/ja301167y ER -