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Bioconcentration factors (BCFs) of MWCNTs at different time points during T. thermophila growth in the presence of MWCNTs, administered either directly in the medium (direct exposure) or with MWCNT-encrusted P. aeruginosa (trophic transfer). The bars indicate BCFs calculated using the mean MWCNT concentration values of three replicates (equations 11 and 12 in SI; Tables S5 and S6) and error bars indicate errors propagated using standard methods.
