Facultative alkaliphiles lack fatty acid desaturase activity and lose the ability to grow at near-neutral pH when supplemented with an unsaturated fatty acid.


Two obligate alkaliphiles were found to have high levels of fatty acid desaturase, whereas two facultative alkaliphiles had no detectable activity. Supplementation of the growth medium of one facultative strain with palmitoleic acid, but not palmitic acid, at pH 7.5 inhibited growth. The obligate strain outgrows the facultative strain in a chemostat at a… (More)


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