Figure 3From: Biogenic synthesis and characterization of gold nanoparticles by Escherichia coli K12 and its heterogeneous catalysis in degradation of 4-nitrophenolFT-IR spectra of reaction solution. (a) Membrane-bound fraction with Au NPs (indicated in blue); (b) membrane-bound fraction treated with β-mercaptoethanol (indicated in red).Back to article page