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Effects of copper, zinc and mercury on the growth and cellulolytic activities of Penicillium ochro-chloron Biourge



Effects of copper, zinc and mercury on the growth and cellulolytic activities of Penicillium ochro-chloron Biourge



Indian J Exp Biol 3(1): 42-44



P. ochro-chloron has been found to be remarkably tolerant to zinc, in addition to copper, but rather sensitive to mercury. The tolerance is somewhat reduced when cellulose (filter paper) forms the source of carbon. Decomposition of cellulose and production of extracellular cellulase by the organism are slightly stimulated by low concentrations of copper; stimulation is feeble with zinc and totally absent with mercury. The high tolerance of the fungus to heavy metals seems to be an inherent property of its cellulase system. At very low concentrations, copper and zinc act as feeble stimulators of the cellulase system, and with increasing concentrations the inhibitory effects become apparent. Mercury has no stimulatory effect and is strictly an inhibitor.

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