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. 2019 Aug 19;9:12040. doi: 10.1038/s41598-019-48475-9

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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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Influence of reaction conditions on the geometry of AuNPs synthesized by the cells. Images (A–D) show variation in the size of nanoparticles synthesized under10, 50, 100 and 200 ppm of KAuCl_4, respectively. (E) Displays the size of particles plotted against different concentrations of KAuCl₄ used for induction. Values are means of 1,000 particles ± SE. Since p value is lower than 0.05 and the value of F is above F Crit in ANOVA, the difference between the groups is significant. (F) Indicates the abundance of AuNPs of different geometrical shapes plotted against changing pH of the medium. Images (G) and (H) display particles synthesized in the culture medium at pH 5.8 and 3.9, respectively. In ANOVA, p value is lower than 0.05 and F value is less than F Crit validating insignificant difference between the groups. Values are means of 1,000 particles ± SE.