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By cloning the beta-galactosidase gene of Bacillus stearothermophilus IAM11001 (ATCC 8005) into Bacillus subtilis, enzyme production was enhanced 50 times. beta-Galactosidase could be purified to 80% homogeneity by incubating the cell extract of B. subtilis at 70 degrees C for 15 min, followed by centrifugation to remove the denatured proteins. Because of its heat stability and ease of production, beta-galactosidase is suitable for application in industrial processes.
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Hirata et al. (1985) studied this question.
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