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. 2018 Dec 18;9:3118. doi: 10.3389/fmicb.2018.03118

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Copyright © 2018 Contreras, Vargas, Jiménez, Muñoz-Villagrán, Figueroa, Vásquez and Arenas.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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HAuCl₄ and K₂TeO₃ reducing activity by crude extracts or EPS from E. cloacae MF01. HAuCl₄ (A,B)- or K₂TeO₃ (C,D)-reducing activity by crude extracts of E. cloacae MF01 was assessed either with NADH or NADPH, at pH values 6.0, 7.0, 8.0 and 9.0, under aerobic (white bars) and anaerobic conditions (gray bars). Assays for HAuCl₄-reducing activity mediated by EPS (E,F) were carried out using samples without treatment (NT) and with previous protease (P) or nuclease (N) treatments, at the indicated pH values and under aerobic (white bars) or anaerobic conditions (gray bars). Bars represent the average of three independent tests ± SD. ^∗p < 0.05; ^∗∗∗p < 0.0002; ^∗∗∗∗p < 0.0001; ns, no significant.