The major portion of cellulase activity of Bacteroides cellulosolvens was cell‐associated. Cells grown on cellulose had a distinctive morphology, characterized by an amorphous outer cell wall layer with irregular, ‘fluffy’ projections. These cells had greater cell‐associated cellulase activity than the cellobiose grown cells which exhibited a smooth, distinct outer layer. It is suggested that the outer layer characteristic of cellulose grown cells is the location of cellulase activity and the site for close cellulose‐cell contact.
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Murray et al. (1986) studied this question.