Preparation of primary nuclear matrix

Reagents and equipment:
1. ammonium sulfate (containing 10mmol / L Tris-HCl, (pH 7.4) and 0.2mmol / L MgCl ^₂ of 1mol / L and 0.2mol / L ammonium sulfate solution);
2. Magnesium chloride (1 mol/L stock solution);
3. P…

With the beginning of the industrial revolution, mechanical production gradually replaced the traditional manual production mode. In recent decades, people have become more and more aware of the packaging of products, and the packaging industry has also developed v…

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The problem of pouring without watering has been plaguing many vegetable farmers during the flowering period. If you do not water, because the soil is dry and the humidity is too low, the oil-bean pollen does not germinate normally, and the adhesion of the stigma of the pistil is poor. It is a…