Like the polymer-bonding model as discussed earlier, the Capetown model suggests that ECPs are produced by Methanobacterium strain AZ, a hydrogen-utilizing methanogen (Palns et al., 1987; Sam-Soon et al., 1988). Under the conditions of high hydrogen partial pressure and limited cysteine, the amino acids (except cysteine) would be over-secreted. Excessive amino acids could induce ECPs formation, and consequently Methanobacterium strain AZ and other genera are enmeshed in the ECPs matrix, which in turn lead to the initiation of anaerobic granulation. In the Capetown model, the overproduction of ECPs is considered a key initiation of anaerobic granulation.
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