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文献和实验TOP10 chemically competent cells
and screw cap tubes before use. Preparing seed stocks Streak TOP10 cells on an SOB plate and grow for single colonies at 23°C room temperature works well Pick single colonies into 2 ml of SOB medium and shake overnight at 23
ChIP protocol for X. laevis Lens1/FoxE3 enhancer
(9) Sonicate the homogenate on ice (10 sec. pulse + 50 sec. break x 6 times, 20% amplitude with a small tip of Branson sonifier (Fisher Dismembranator Model 500)). This step releases chromatin DNA from cells without solubilizing yolk proteins that make
为第i类理论值,n为类型数,n-1为自由度(df)。本例观察总数为226株,E1 =226×9/16=127.125株,E2 =E3 =226×3/16=42.375株,E4 =226×1/16=14.125株,得下表: (3)从无效假设出发,根据实得的x2 值与自由度查x2 表,可确定因随机误差造成该差异度量值(x2 =0.643)的概率P,x2 表见下(这里仅列出10个自由度): 不同x2 值和不同自由度时的P值
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