Figure 3.

(A) Au@NPs formation by S. oneidensis MR-1with wavelength effect after 12 h. (B) Rate constant of Au@NPs formation by S. oneidensis MR-1 in various wavelength and PPFD within 12 h. The different wavelength of light exposure was obtained using colored filter to separate visible spectra from 400–700 nm for white light, 640 to 700 nm for red light, 425 to 490 nm for blue light, 500 to 560 nm for green light, 570 to 620 nm for yellow light, 400 to 500 and 660 to 700 nm mixture for magenta light. The light intensity was adjusted by distance from light source to reaction and the correlation between distance and light intensity in different light source were shown in Table 1. All the experiments were conducted in triplicate.