Occurrence law, leukoplakia is a fungal disease, mainly harmful to the leaves, mostly from the first part of the leaf. The suitable temperature for onset is 11-23 °C, and the relative humidity is above 60%. It is a low-temperature and high-humidity disease, and continuous rainfall can promote disease prevalence. Continuous cropping is low and the water is too popular to be susceptible to disease. Field identification, in the early stage of the disease, the leaves of the leaves slightly brown round spots, gradually expanding into round white lesions, the surface can be faintly visible one or two lines, the periphery of the lesions have a halo, the back is convex. Later lesions are translucent, thin as paper, and sometimes cracked and perforated. When the disease is serious, the lesions become irregular large spots, the leaves are yellow and dry, and the leaves are yellow and dry from the outside to the inner layer, which may cause the affected field to be yellow. Control method: 2% antimycotic 120 water 200 times solution, or 1% agricultural anti-wuyin liquid 150 times solution, spray once every 6 days, even spray 2-3 times. Or use 70% thiophanate-methyl WP 800 times solution 75% chlorothalonil WP 600 times solution, 50% carbendazim WP 800 times solution, 50% carbendazim WP 1000 times solution 50% Vinyl nucleocapsid WP 1000 times solution 60% cream Mn-Zn wettable powder 600 times solution, 50% bactericidal melamine powder WP 800 times liquid spray, interval 10 days, 2-3 consecutive times When using the medicine, it must be used together with the new high-fat film. The medicine can be used alternately to improve the control effect and avoid the resistance. Extraction Kit Magnetics Bead Method
This standard specifies the terms and definitions, classification, technical requirements, test methods, identification, labels and instructions for use, packaging, transportation and storage of nucleic acid extraction kits (magnetic beads method) (hereinafter referred to as "kits"). This standard It is suitable for extracting and purifying human genomic nucleic acid and its fragments from various clinical samples such as serum, plasma, whole blood, cerebrospinal fluid, milk, saliva, urine, sputum, swab, tissue or paraffin-embedded tissue by magnetic bead method , Pathogen nucleic acid kit. Pathogen nucleic acid includes deoxyribonucleic acid (DNA), ribonucleic acid (RNA), etc. This standard does not apply to nucleic acid extraction reagents contained in closed systems that cannot extract nucleic acid extraction products for detection.
This kit uses magnetic beads with unique separation function and a unique buffer system to separate and purify high-quality virus from serum, plasma, lymph, cell-free body fluid, cell culture supernatant, urine or various virus preservation solutions DNA/RNA. The uniquely embedded magnetic beads have a strong affinity for nucleic acids under certain conditions, and when the conditions change, the magnetic beads release the adsorbed nucleic acids, which can achieve the purpose of rapid separation and purification of nucleic acids. The whole process is safe and convenient, and the extracted viral DNA/RNA has high yield, high purity, stable and reliable quality, and is especially suitable for automated extraction of high-throughput workstations. The nucleic acid purified by this kit can be applied to various routine operations, including RT-PCR, fluorescence quantitative PCR and other downstream experiments.
Nucleic Acid Lsolation Reagent Kits,Dna Purification Kit,Viral Rna Extraction Kits,Nucleic Acid Extraction Reagents Jilin Sinoscience Technology Co. LTD , https://www.contoryinstruments.com
Prevention and control of yellow leaves in Chinese cabbage