XRP44X(50MG)

Ampicillin(50mg/ml)

  Ampicillin (50mg/ml) Ampicillin Dissolve Ampicillin (Na salt from Sigma, A-9518) in H2 0. Store 1 ml aliquots at 20o C in common freezer for stock solutions   上一篇：PREPARATION

Measurement with the Light Microscope

, the calibration would be 25 µm at 40x, 2.5 µm at 400x, and 1 µm at 1000x. Some stage micrometers are finely divided only at one end. These are particularly useful for determining the diameter of a microscope field. One of the larger divisions is positioned

无籽西瓜 seedless watermelon

　　 是利用三倍体植物的不孕现象培育成的。它的培育过程为：把普通的西瓜（二倍体 2n=2x=22）用秋水仙素处理而得到四倍体（ 2n=4x=44），然后对雌蕊授上二倍体的花粉，即可 体（♂）时，一般都得不到正常的种子］。把二倍体正常粉授在这种三倍体植物的雌花上，使它成为刺激，子房即可膨大而成无籽的果实。实际栽培时往往是把 3x与 4x进行混栽