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.
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According to tests conducted by professional agricultural departments, the growth and development pattern of beef cattle follows a distinct trajectory. Calves grow rapidly in their first year, with the growth rate gradually slowing down after they reach one year of age. This decline becomes more pronounced between 1.6 to 2 years old. For example, Charolais cattle show a daily weight gain of 1.5 to 1.8 kilograms during their first six months, which then drops to 0.9 to 1.05 kilograms between seven and twelve months. These findings highlight that younger cattle are more efficient in converting feed into weight gain compared to older ones.
From an economic standpoint, raising younger calves is more cost-effective. They require less feed to achieve the same weight gain, which reduces overall feed costs and improves capital and equipment utilization. As a result, it's often more beneficial to wean calves at 4 to 6 months of age, allowing them to graze during the summer and autumn seasons while receiving supplemental feed as needed. During winter and spring, they are typically kept in plastic greenhouses or barns to protect them from harsh weather conditions.
It’s common practice to keep these cattle until they are around 1.5 years old, especially after the second autumn and winter cycle. The optimal time for slaughter is when the cattle reach approximately 300 kilograms, ensuring a balance between meat quality and feed efficiency. This approach not only maximizes profitability but also supports sustainable beef production practices.