Crociani F, Matteuzzi D
Ann Microbiol (Paris). 1982 May-Jun;133(3):417-23.
The urease activity of 414 strains representing 21 species of the genus Bifidobacterium was surveyed. The strongest ureolytic strains belong mostly to the species B. suis and only a few to B. breve, B. magnum and "subtile" homology group. The study of some strongly ureolytic strains showed that urea and organic nitrogen concentration did not influence urease production. The high urease activity found also in the absence of urea suggested that this enzyme is not inducible. An ammonia concentration of 14 mM did not repress urease activity.
对代表双歧杆菌属21个物种的414株菌株的脲酶活性进行了调查。脲酶活性最强的菌株大多属于猪双歧杆菌，只有少数属于短双歧杆菌、巨大双歧杆菌和“微妙”同源组。对一些脲酶活性强的菌株的研究表明，尿素和有机氮浓度不影响脲酶的产生。在没有尿素的情况下也发现了高脲酶活性，这表明该酶不是诱导型的。14 mM的氨浓度不会抑制脲酶活性。
