k-r

The reliability coefficient of the multiple-choice cloze was estimated by the Kuder-Richardson 20 ( K-R 20 ).

多项选择式完形填空题的信度以K -R 20来计算.

There was a monogram in the corner in which were the initials " R . K . B . "

原来手帕角上有个图案,其中包含着 RKB 三个字母.

Aber f ü r mich war die tollste Entdeckung im K ü hlregal bisher das , was die Deutschen Quark nennen.

德国绝对不是适于那些对奶制品过敏的人的国家.

With genome DNA as template, three upstream primers ( R1 、 R2 、 R3) targeting point mutation of K-ras oncogene codon 12 and common downstream primer ( R4) were added respectively. PCR was employed to amplify corresponding fragment with Taq DNA polymerase.

以基因组DNA为模板，分别加入针对K-ras第12密码子的三种主要突变方式设计的PCR上游引物R1、R2、R3和共同的下游引物R4，在taq DNA聚合酶作用下扩增相应片段。

Objective : To confirm the cleavage activity of ribozyme Rz 199 to oncogene K ras messenger RNA.

目的: 确定人工设计的核酶Rz199对原癌基因K-rasmRNA的体外切割活性,为K-ras特异性核酶的体内应用提供依据.