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. 2011 Nov;77(22):8181–8183. doi: 10.1128/AEM.06205-11

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Fig. 1. — Effects of REEs on B. subtilis amylase production. B. subtilis strain 168 was cultivated at 30°C for 48 h in NG medium with or without each REE (chloride salt) added at a concentration of 5 (light gray thick bars), 10 (gray thick bars), or 20 (black thick bars) μg/ml. The culture supernatants obtained after centrifugation were used for the amylase assay. Relative amylase activity was calculated by dividing the activity obtained when cells were grown in REE-supplemented medium by that obtained when cells were grown in the control medium (no addition of REE). The average values for three independent experiments are shown. Error bars represent the standard deviations. Asterisks denote significant differences (P < 0.05). Abbreviations: Sc, scandium; Y, yttrium; La, lanthanum; Ce, cerium; Pr, praseodymium; Nd, neodymium; Sm, samarium; Eu, europium; Gd, gadolinium; Tb, terbium; Dy, dysprosium; Ho, holmium; Er, erbium; Tm, thulium; Yb, ytterbium; Lu, lutetium.