Recently, the Provincial Meteorological Observatory reminded farmers that wheat should be watered and fertilized in time after suffering from mild frost.
According to Su Aifang, deputy director of the Provincial Meteorological Observatory, at present, winter wheat in the western Henan, northern Henan and eastern Henan areas has just started jointing, and southwestern Henan and southern Henan have entered the jointing stage. The resistance to low temperature is stronger than the booting stage, but the temperature is greatly reduced to wheat. Stable differentiation of panicles still has some adverse effects. Due to the low temperature, winter wheat damage may occur in winter wheat in Shangqiu, Zhoukou and eastern Kaifeng in eastern Henan. After the wheat is subjected to mild frost, it should be watered and fertilized in time to promote the recovery of wheat as soon as possible. In addition, the facility features agriculture should also be prepared for antifreeze.
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Plant extraction process
1. Select plants/herbs. No more than ancient prescriptions, prescriptions, folk herbs to find. At present, common and uncommon herbs have been studied. At present, it is mostly to increase the amount of medicinal materials to extract and separate components with low content, or to find medicinal plants that have never been studied from miao medicine, Tibetan medicine, Mongolian medicine, Africa, Latin America and other places.
2. The extraction. Solvent petroleum ether, n-hexane, cyclohexane, benzene, chloroform, ethyl acetate, n-butanol, acetone, ethanol, methanol, water (low polarity → high polarity). Daily medicine decoction effective, water and ethanol and other solvents with large polarity, such as artemisinin boiling ineffective extraction with petroleum ether and other solvents with small polarity. Common medicinal materials water/alcohol/ether to go through, separation and identification of more compounds.
3. The separation. This is the most important work. In the solution extracted from the second step, there are dozens of compounds, usually by column chromatography, which is often referred to as the column flushing. It's a lot of work, it's boring, it's low tech. A master's student might do this every day for two years. The column for separating compounds, as shown below, is as large as 2 meters high and as small as 10 centimeters. Change the solvent condition of mobile phase, change the material of column, different conditions and different separation principles of column repeatedly punching, can be separated from the monomer compound.
Herbal Medicine,Ginger Extract Powder,Hawthorn Berry Extract,Lycium Berry Fruit Extract
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