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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/).
Effect of ZnO NPs on S. rubescens biomass concentration in terms of total suspended solids (TSS) and volatile suspended solids (VSS) cultured in ⅓N BG-11 medium at hydraulic retention time (HRT) of: (a) 40 d and (b) 20 d.