Burning method Suitable for powder pesticides. You can take a proper amount of powder pesticide on the metal foil and then burn it on the fire. If white smoke appears, it proves that there is no failure; if it does not appear white smoke or insolubilize, it proves to be a fake medicine.
The water method is applicable to wettable powders and emulsion pesticides. 50 grams of powder pesticide can be taken, placed in a glass bottle, add a certain amount of water, a little agitation, after half an hour, if the particles are suspended evenly, there is no precipitation at the bottom of the bottle, indicating that the drug has no failure. The wettable powder tends to become a block during storage. The agglomerated powder is first crushed, and a small amount of water is added. If it dissolves quickly, it proves that the medicine has not failed, and is not a counterfeit medicine.
The shock method applies to emulsion pesticides. First look at whether the top and bottom are layered. If it is layered, it can be oscillated up and down to make it uniform and then allowed to stand for one hour. If it is still layered, it is not a failure and it is a fake medicine. It can not be reused.
Farmers Daily
The in vitro culture of cells and tissues has become an indispensable part of life research and practice. A wide variety of cell types are cultured, from viruses to bacteria and fungi, from human cells to animal and plant cells. Some cells and tissues can be grown in suspension, but a considerable number of mammalian cells require surface attachment. Therefore, in addition to good transparency, non-toxicity and sterility, the culture flasks, Culture Plates and culture dishes used to provide the in vitro culture environment of cells also need to be surface-modified to enable them to adhere, divide and grow.
75 cm cell culture flask,t75 cell culture flask,suspension cell culture flask
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