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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 (http://creativecommons.org/licenses/by/4.0/).
Evolution of the imaginary shear modulus for 5 MHz (a) and 15 MHz (b). Biofilm formed by S. epidermidis and E. coli are represented by dot line and solid line, respectively.