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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Myrobalan brown spot is a fungal disease that damages the leaves and causes the flower buds and twigs to die, severely affecting tree vigor and yield. Incur 3-4 years after the onset of illness can cause the death of the whole plant. As far as the author is concerned, the disease is currently occurring in many varieties of bayberry in our city. It is necessary to draw the attention of the majority of Meinon farmers. Before and after May, the disease spread and spread during the rain and invaded the leaves. By August, the disease began to appear. In October, the number of lesions increased, followed by a large number of fallen leaves. Currently, it is a good time to observe the disease. When the disease condition appeared, needle-sized purple-red dots began to appear on the leaves, and gradually expanded to be nearly round or irregular, with a diameter of 4-8 mm. The center of the lesion is reddish-brown, brown or grayish brown on the edge, and the center of the lesion changed to light brown or grayish white, with scattered small black spots on it. Most of the lesions healed into larger plaques, causing the diseased leaves to dry off. The best prevention and treatment time of the disease is from mid-May to early July after harvest. For the time being, it is mainly to clean the leaves of orchards and burn them to reduce the source of overwintering, so as to lay the foundation for prevention and treatment in the coming year; The use of lime sulfur (water agent) can be assigned to 3-5 (Bomer) degree, and spray 2-3 times.