This period is the period when wind and vegetative growth and reproductive growth go hand in hand. The demand for various nutrients and water is significantly increased. It is critical to strengthen field management and meet the requirements for water and fertilizer conditions in a strong growing season. (1) Intertillage and weed control: The duration of the wind rejuvenation from breeze to vigorous growth is more than 2 months. During this period, the production fields are still mainly based on root growth and development. In the field, cultivators are often used for cultivating soil, soil is used for soil conservation, weeds are eliminated, and root systems are improved. Growing environment, promote root growth. After the plants are sealed off, weeds should be removed in time to prevent grass shortage. (2) Extra-root fertilizer: According to the growth condition of plants, if there is insufficient nutrition, extra-root fertilizer may be applied. In the windless afternoon, spraying a certain concentration of potassium dihydrogen phosphate, spraying Po, rooting agent (used as specified), to supplement nutrient supply, extend the functional period of the leaf, prevent premature aging of the plant. (3) Snoring and stimulating roots: In the year of wind-proof sowing, only leafy tussocks were formed, and in the second year from June to July, more than 80% of the plants were convulsed and flowered. After the plants on the ground bloom, the underground roots begin to be lignified and hollow, which seriously affects the quality of medicinal roots or loses medicinal value. Therefore, the plants other than the planting field for more than 2 years must be removed in time when the calyx appears, usually 2 or 3 times, and they will be destroyed when they are seen, so as to avoid flowering and consume nutrients and affect the development of roots. The seedlings shall be planted in the planting area and no snoring shall be performed. In the 3 to 4 year wind-proof field, the plants that grow robustly and have strong and full plants are selected. (4) Dehumidification and deodorization: When the field encounters flooding or stagnant water, the plant growth is weak and it will cause rot-root phenomenon. Therefore, the rainy season should be combined with soil, deeper sulcus to facilitate drainage, so as not to affect plant growth. (5) Rotation of crop rotation: Windbreak continuous cropping will cause problems such as unbalanced soil fertility, serious diseases and insect pests, etc., resulting in poor plant growth, poor root development, and impact on windbreak yield and quality. Therefore, windrow cultivation should be implemented to avoid cropping.
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