1.1.1.71 Ca2+ Ca2+ has an stabilizing effect. With 1.0 mM CaCl2, the enzyme is completely stable at 0°C for 2 h and after 3.5 h almost 90% of the initial activity is retained 740200 1.1.1.71 Co2+ moderately activating the reduction of butanal, but no activation of oxidation of 1-butanol 761529 1.1.1.71 Co2+ required 737536 1.1.1.71 Fe2+ moderately activating the reduction of butanal, but only very weak activation of oxidation of 1-butanol 761529 1.1.1.71 Fe3+ moderately activating the reduction of butanal, but no activation of oxidation of 1-butanol 761529 1.1.1.71 K+ optimally active in the presence of 2 M KCl 722208 1.1.1.71 KCl 600 mM, 147% of initial activity 726712 1.1.1.71 KCl a preference for KCl over NaCl is observed, with best activity at 4 M KCl 728288 1.1.1.71 KCl activity increases in the presence of KCl is maintained even at concentration of 3 M 726712 1.1.1.71 KCl maximally active with ethanol with 4 M KCl. It is maximally active with 1-propanol with 2 M KCl and with 1-butanol and 1-pentanol with 1 M KCl. Optimum activity with the secondary alcohols, 2-propanol and 2-butanol, is observed with 3 M KCl and 2 M KCl, respectively, and with isoamyl alcohol in the presence of 1 M KCl. Maximum activity with benzyl alcohol is detected with 2 M KCl. Catalyzed the reductive reaction optimally at pH 6.0 with 1 M KCl 726769