A wide variety of natural products , e . g . alkaloids , - lactames , biotin , amino sugars has been synthesized by 1 , 3 - dipolar cycloaddition reaction between nitrones and alkenes 摘要通过硝酮与烯烃化合物的1 , 3 -偶极环加成反应合成了许多天然?物,如生物硷、 -内酰胺、生物素、氨基糖等。
Abstract : a wide variety of natural products , e . g . alkaloids , - lactames , biotin , amino sugars has been synthesized by 1 , 3 - dipolar cycloaddition reaction between nitrones and alkenes 文摘:通过硝酮与烯烃化合物的1 , 3 -偶极环加成反应合成了许多天然产物,如生物碱、 -内酰胺、生物素、氨基糖等。
A aada2 cassette , encoding aminoglycoside adenylyltransferase , was found in 2 isolates of shigella sonnei , and a two cassettes array of dfra1 , encoding dihydrofolate reductase , and aadala in one isolate of shigella sonnei , and another two cassettes array of dfra1 7 and aada5 in two isolates of shigella sonnei and shigella flexneri y - variant each , and a dfrv cassette in one isolate of shigella flexneri 6 , respectively 对其可变区测序分析,其中2株宋内志贺菌i类整合子均携带1个基因盒,为氨基糖昔腺营酞基转移酶( aminoglycosideadenylyltransferase ) az基因( aa朔2 ) ,编码对链霉素的抗性。