林泽兰内酯C，757202-11-2，≥98%，阿拉丁

Synthesis of Triazole‐Nucleoside Phosphoramidites and Their Use in Solid‐Phase Oligonucleotide Synthesis

of Uracil and Cytosine Pyrimidine Bases   Materials Sodium hydroxide (NaOH), ≥98%

u检验和t检验

样本含量n1、n2较小时，且要求两总体方差相等，即方差齐（homoscedasticity）。若被检验的两样本方差相差较大且差别有统计学意义则需用t'检验。 　　　　　　公式（19.10） 　　　　　　公式（19.11） 　　　　　　公式（19.12） 　　式中sx1 －x2 ，为两样本均数之差的标准误，s2 c为合并估计方差（combined estimate variance）。算得的统计量为t，按表19-4所示关系作出判断。

Assisted large fragment insertion by Red/ET-recombination (ALFIRE)―an alternative and enhanced method for large fragment recombineering

making it possible to use the technique in E. coli and other commonly used bacterial strains (10). In addition, the recombination efficiency was increased 10�100 times (11). The combination of these three enzymes (α, β and γ, or E, T and γ) in one vector