6. 5000 rpm离心一分钟收菌,重悬后取100-200 μl涂布到含相应抗生素的S.O.C平板上(因菌量较大,若全部涂板请选用直径15cm培养皿2-5个)。将平板倒置放于37℃培养箱过夜培养13-17小时。S.O.C 培养基配方2% Tryptone0.5% Yeast Extract10 mM NaCl2.5 mM KCl10 mM MgCl210 mM MgSO420 mM glucosePH-7.0S.O.C. Medium is suitable for use in the final step of cell transformation to obtainmaximal transformation efficiency of E. coli (Hanahan, 1983).