Before sowing vegetables, in addition to seed coating, they should also disinfect seeds. This has a certain effect on preventing the occurrence of pests and diseases. Common methods are:
Dry heat treatment The seeds are heat-treated at 70°C to 80°C, killing germs on the surface and inside of the seeds, and inactivating the virus to reduce the incidence of seedling diseases.
Soak the seed in the broth and place the seed in the enamel pot. Slowly pour into warm water of 50°C~55°C (2 portions of boiled water to 1 portion of cold water), and stir while mixing. The amount of water is 5~6 times the amount of seeds for 10~15 minutes. When the water temperature drops to 30°C, stirring is stopped and soaking is continued.
Hot water boiled seeds will be placed in enamel pots, into cold water until just submerged seeds, and then 70 °C ~ 75 °C hot water into the pot, stirring while stirring, the water temperature at 55 °C stop stirring, keep the water temperature 7 ~8 minutes, the amount of hot water should not exceed 5 times the amount of seeds.
Human chorionic gonadotropin is a hormone for the maternal recognition of pregnancy produced by trophoblast cells
Human chorionic gonadotropin (HCG) is a glycoprotein secreted by trophoblast cells of the placenta And β dimer proteins. The molecular weight of glycoprotein hormone 36700, A. Pituitary, FSH, follicle stimulating hormone, LH (luteinizing hormone) and TSH (thyroid stimulating hormone) are basically similar, So they can cross-react with each other, while the structure of β subunit is not similar. In mature women, the fertilized ova move to the uterine cavity for implantation and form embryos. In the process of development and growth into the fetus, the placental syncytiotrophoblast cells produce a large amount of HCG, which can be excreted into urine through the blood circulation of pregnant women. Serum and urine HCG levels rise Rapidly from 1 to 2.5 weeks of gestation, reaching a peak at 8 weeks of gestation and dropping to moderate levels at 4 months of gestation, which remain at the end of gestation. At present, the commonly used detection methods are: latex aggregation inhibition test and hemagglutination inhibition test; Radioimmunoassay (RIA); Enzyme linked immunosorbent assay (ELISA); Monoclonal antibody colloidal gold test
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