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The effects of various metal ions (Na+, K+, Ca2+, Mg2+, Al3+, Co2+) and anions (Cl–, SO2-4 and CH3COO–) on two cellulases were investigated. Fitting of the data to Michaelis-Menten kinetics showed that Al3+ noncom-petitively inhibited cellulase (Km = 22.6