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马源残留DNA探针法荧光定量PCR试剂盒上海圻明生物优势供应。更多产品资料欢迎免费咨询。
One of the many important uses of PCR technology is that it can be used to label DNA probes with high specific activity. PCR technology has high specificity, and can synthesize probe DNA fragments in quantities within 1~2h if [α-32P]dNTP or other markers are added to the substrate
dNTPs, the probe DNA can be well labeled during DNA synthesis, and the incorporation rate of the marker can be as high as 70%~80%. Therefore, PCR labeling technology is particularly suitable for large-scale detection and non-radiolabeling. The disadvantage of this method is that a specific pair of PCR primers is synthesized.
Labeling can also be achieved by using small fragments prepared from probe DNA as primers.
Solution preparation
1. Prepare a stock solution
Unless otherwise stated, all unused stock solutions should be divided into disposable aliquots and stored at -20 °C after preparation. Avoid repeated freeze-thaw cycles.
1.1* Acid Stock Solution (125X):
Add 20 μL DMSO to *ate (component B) to make a 125X* acid stock solution.
2. Prepare standard solutions
*Salt standard solution
Add 50 μL of 1 mM KH2PO4 (Component C) to 950 μL of deionized water or enzyme reaction buffer to give a 50 μM * saline standard solution (PS7). A 50 μM * saline standard solution (PS7) was taken and serially diluted 1:2 to obtain a serially diluted phosphate standard with deionized water or enzyme reaction buffer.
3. Prepare a working solution
Add 20 μL of 125X* stock solution to 2.5 mL of sterile H2O and mix well to make a working solution of *salt. Avoid potential Pi contamination. Note: Avoid direct exposure of *salts (component B) to light. Due to the high sensitivity of this assay to Pi, it is extremely important to use Pi-free labware and reagents.
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文献和实验迁移实验需要制胶、跑胶、转膜、检测等步骤，操作稍显繁琐；特别是在样本量较大的时候，更显得力不从心。 为了解决这些转录因子检测中的问题，美国Signosis开发出了一种快速高效的半定量活性转录因子检测方法——滤板法。这种方法同样基于转录因子与特定DNA序列结合的原理，以标准96孔板为载体进行实验操作。针对不同的转录因子设计特异性的生物素标记DNA探针，探针与样本核提取物中相应的转录因子结合形成TF/DNA复合物。用滤板除去游离的DNA探针，随后从滤板上洗脱并收集TF/DNA复合物中的DNA探针。用标准
如何获得高质量、高可信度的荧光定量PCR结果--高质量cDNA标准
过程，无RNA损失。这就需要裂解液即可迅速裂解细胞，高效的保护RNA，又不会影响高效反转录反应，且对于后续荧光定量PCR无抑制作用。FastLine细胞到cDNA快速制备试剂盒（KR105，TIANGEN），一站式完成从细胞到cDNA的快速制备，同时去除基因组DNA残留，整个操作流程仅需50 min，获得的cDNA不但可以直接进行荧光定量 PCR还可以和正常提取RNA后进行第一链反转录后得到的cDNA一样，冷冻保存供以后使用，是从少量细胞快速制备cDNA的最佳选择，并可实现高通量检测。 图
标记DNA探针 如果您有足够量的高纯度模板，建议您采用随机引物标记方法的DIG High Prime DNA Labeling and Detection Starter Kit I 和II。这两个试剂盒包含了标记、封闭、杂交和检测所需要的所有试剂，是真正意义上的一站式服务的试剂盒。二者之间的差别在于检测方法的不同：Starter Kit
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