The great discrcpeney in activation enthalpies might indic-cate that the differences were in the response to change and tension strength of the substrates and active center of catalases when active complexes were formed through soil catalases.

• 活化焓差别较大,说明各土壤过氧化氢酶形成活化络合物时,底物与酶活性中心在应变和扭曲强度上的差异。