以下为句子列表：
英文: The enzyme activity was remarkably decreased after DEPC, NBS, EDC modification. The results indicated that carboxyl group, imidazolyl group and indolyl group seemed to be significant to the catalytic activity of cyclodextrin glucantransferase.
中文: 用焦碳酸二乙酯(DEPC)、N-溴代琥珀酰亚胺(NBS)和碳化二亚胺(EDC)修饰后,酶活力大幅度下降,说明组氨酸、色氨酸和羧基氨基酸为酶活力所必需。
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