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. 2022 Dec 30;11(1):102. doi: 10.3390/microorganisms11010102

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(a) Surface plasmon absorption bands (SPR) of AgNPs formed in the presence of Streptomyces sp. ASM23 cell filtrate (CF-AgNPs). (b) The color change due to the reduction of metal ions and (c) the formation of AgNPs represented by (a) Control+ AgNO3 and (b) Streptomyces sp. ASM23 cell filtrate+ AgNO₃. (d) Selected area (electron) diffraction (SAED) confirms the crystalization of nanoparticles. (e) Transmission electron microscope micrographs for (f) AgNPs biosynthesized by Streptomyces sp. ASM23 cell filtrate (CF-AgNPs) and cell supernatant (CS-AgNPs). (g) X-ray diffraction (XRD) pattern of silver nanoparticles.