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Critical process parameters optimization for hyperthermostable β amylase production by Bacillus subtilis DJ5 using response surface methodology - doi: 10.4025/actascibiolsci.v36i1.17427. Acta Sci. Biol. Sci. 2013;36(1):87-93. doi:10.4025/actascibiolsci.v36i1.17427