Advantage 2 Polymerase Mix is an optimized blend of PCR enzymes that is a proven balance of high yield and high fidelity (with 3X higher fidelity than regular Taq) for cDNA amplification and library construction. With an automatic hot-start feature, our Advantage 2 Polymerase Mix can readily amplify a wide range of DNA templates, including long templates up to 18 kb, and complex genomic DNA up to 6kb. The Advantage 2 Polymerase Mix includes two optimized buffers. dNTPs need to be purchased separately.
Advantage 2 Polymerase Mix is an optimized blend of PCR enzymes that is a proven balance of high yield and high fidelity (with 3X higher fidelity than regular Taq) for cDNA amplification and library construction. With an automatic hot-start feature, our Advantage 2 Polymerase Mix can readily amplify a wide range of DNA templates, including long templates up to 18 kb, and complex genomic DNA up to 6 kb. The Advantage 2 Polymerase Mix includes two optimized buffers. dNTPs need to be purchased separately.
Advantage 2 Polymerase Mix is perfect for PCR applications requiring accuracy, such as RACE PCR, cDNA amplification, library construction, and PCR subtraction. Advantage 2 Polymerase Mix is highly recommended for applications downstream of our SMART(er) method for cDNA synthesis.
Advantage 2 Polymerase Mix is also available in a complete PCR kit that includes dNTPs and PCR controls, or in a ready-to-use, lyophilized format (High Fidelity PCR EcoDry Premix).
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所以一个细菌或病毒可以有很多的抗原。
若已进入细胞内。则先由巨噬细胞吞噬降解。并形成抗原-MHC复合体传送到表面。被辅助性T淋巴细胞识别和效应T淋巴细胞识别后。效应T淋巴细胞被激活。分解靶细胞。然后再由效应B细胞分泌的抗体进一步消灭病毒。
还有不清楚的么？
荚膜（capsule）是某些细菌在生长繁殖过程中分泌的一层黏液性物质，包围在细胞壁外，通常这种黏液层厚度小于0.2μm，成分是多糖或多肽，只有在营养丰富时或在动物体内，细菌才产生这种半抗原性质的黏液性物质。它具有保护菌体免受巨噬细胞等的捕捉和吞噬，因而具有抗吞噬抗消化、侵袭力强、与致病性关系密切等特点。像肺炎球菌、炭疽杆菌等都有这类荚膜。有些细菌的荚膜层较薄，小于0.2μm，称为微荚。
像链球菌的M蛋白、伤寒杆菌的Vi抗原、大肠杆菌的K抗原等都属于这类微荚膜。
请赐教！
