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. 2019 May 20;9:7589. doi: 10.1038/s41598-019-44088-4

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(A) The scheme for the mechanism of gold nanoparticle fabrication by photo-induction in S. oneidensis MR-1. (B) The correlation between light intensity and the quantity of bio-fabricated Au@NPs. Description: red, green and blue patches on the outer membrane refer to extracellular polymeric substances (EPS). Arrows with red, blue and green colors serve as the light source with different wavelength. Thickness of arrow in (B) indicates the amount of light intensity (photosynthetic photon flux density, PPFD).