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Bacillus clausii BT-21 produced an extracellular malto-oligosaccharide-forming amylase active at high pH when grown on starch substrates. The enzyme was purified to homogeneity by affinity and anion-exchange chromatography. The molecular weight of the enzyme estimated by sodium dodecyl sulfate polyacrylamide electrophoresis was 101 kDa. The enzyme showed an optimum of activity at pH 9.5 and 55 ...