固定底物酶底物法(DefinedSubsrateTechno固定底物酶底物法(Defined Subsrate ?Technology, DST,以下简称DST-酶底物法)采用大肠菌群细術能产生P-半乳糖苷酶(P-D-gaUctosUlase)分解邻硝ji苯P-D-半乳吡喃糖苷0NPG(Ortho-Uropheny-p-D-galaclopyranoside)使培养液呈黄色,以及大肠埃希氏