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- W1989013359 abstract "In seeds of Guilfoylia monostylis (Benth) F. Muell (non-dormant, with recalcitrant viability characteristics) cyanide pretreatment stimulated the rate of seed germination and caused a sharp increase in cotyledonary peroxidase activity during the first 24 h; activity decreased rapidly thereafter. Activities of pentose phosphate pathway dehydrogenases (Glucose-6-phosphate dehydrogenase and 6-phosphogluconate dehydrogenase) and catalase were unaffected by the cyanide pretreatment. The enhanced peroxidative activity was dependent on the concentration of cyanide and the treatment duration. Activity was also dependent on the steeping and assay temperatures, with an optimum of 20°C. The kinetic parameters, Vmax and Km, were modified with cyanide treatment. While Vmax greatly increased, Km values were lower, suggesting an increased affinity of the enzyme for the substrate. Enzyme purification resulted in the loss of the Vmax differential, probably due to loss of the stimulatory ‹principle›. In the absence of pseudoperoxidative reactions it is suggested that cyanide-enhanced peroxidative activity was due to the release/activation of some temperature sensitive and extremely labile macro-molecular complex (enzymes) capable of behaving like peroxidase." @default.
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- W1989013359 date "1996-01-01" @default.
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- W1989013359 title "Effect of cyanide pretreatment on peroxidase activity in germinating seeds of Guilfoylia monostylis" @default.
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