Abstract
Generally, alkaliphilic Bacillus strains cannot grow or else grow poorly under neutral pH conditions, but they grow well at a pH higher than 9.5. Since 1969 we have isolated a large number of alkaliphilic Bacillus strains from various environments and have purified many alkaline enzymes (Horikoshi 1991). As mentioned above, alkaliphilic bacteria containing Bacillus strains have been isolated from even deep-sea sediment collected at depths of 1000-10 000 m depth at a frequency of 0.2 x 102 to 2.3 x 104 per colonies g-’ dry sea mud (Takami et al. 1999a).
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