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ARSTRACT Different cellulose samples as well as lignocellulosic materials which had been pretreated by either organoaolv or hydrothermolyaia proceaaee vere tested 88 to their degradability by a crude cellulaae preparation from Trichoderra viride. The glucose concentrations in hydrolyaate sample8 were determined by HPLC. End-product Inhibition of the cellulaae complex by glucose and cellobloae w a a a l s o studied, as were inhibitory effects caused by lignin-and hemicelluloaederived pretreatment aide-products. IIRBODUCTIOEWithin the scope of reaearch efforta aimed at utilieing cellulose-containing biomass for the produc-269 7.0 mg glucose/min. Subatratea a) Pure celluloees: Celluloke, microcrystalline (Avicel(R)), Merck, Darmatadt, West Germany, batch no. 2313920 Cellulose, native, Xerck, batch no. I 1 98536 Cellulose powder, Schleicher 8 Schiill, Dasael, Weat Ge rmany Cotton (from the card)