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Three potential scenarios (EDL, BAL, EAL) in which nutrients are added to stimulate microbial activity and the ratio of resources are shifted. The different resource ratios can impact desired microbial activity, namely that electron donor/acceptor balanced conditions promote relatively high Cr(VI) reduction and cell viability compared to intermediate Cr(VI) reduction and viability under electron-donor limitation and low Cr(VI) reduction and viability under electron-acceptor limitation
