Fig. 1From: Key genes of electron transfer, the nitrogen cycle and tetracycline removal in bioelectrochemical systemsContents (column graph) and degradation rates (scatter graph) of tetracycline in different treatments. Different lowercase letters represent significant differences at the 0.05 level. The soil MFC and its anaerobic control spiked with tetracycline were labelled MT and AT, respectivelyBack to article page