(A) GNPs synthesised by Stenotrophomonas maltophilia (tube A). Control experiments: gold chloride incubated without the biomass (tube B) and with heat-killed cell mass (tube C). (B) TEM image recorded from a drop-coated film of disrupted cell suspension. Scale bar corresponds to 200 nm. (C) Energy Dispersive Spectra of synthesized GNPs showing Au peaks as major constituent.