This procedure allows the concentration of DNA samples from dilute solution and the removal of unwanted salts from DNA samples. Materials •3M Sodium Acetate buffer pH 5.2 (store at 4 ℃) •Col ...
Dr. William H. Heidcamp Biology Department Gustavus Adolphus College http://homepages.gac.edu/~cellab/chpts/chpt14/ex14-6.html Materials •DNA •CsCl •0.3 N NaOH •0.2 M Tris-HCl buf ...
转膜是把DNA 从琼脂糖凝胶中转移到固相支持物(一般是尼龙膜)上固定,是进行各种后续研究(如 RFLP 分析,阳性克隆的筛选验证等所有涉及分子杂交的研究)的前提。 实验目的: 掌握 Southern blotting 的原理及操作步骤 实验原理: 1.转膜的方式: 向上的毛细管转移 向下的毛细管转移 同时向两张膜转移 电转移 真空转移 ...
Hi. I am a new member of this forum. Currently I am trying to look for some novel methylated gene in NPC cell line. What method should I start with? Pls help. Thank you. -CHOO- ---------------------- ...
溶液配制 (一)LB培养基 每1000 ml加分析纯NaCl 10 g,蛋白胨10 g,酵母粉5 g,用ddH2O配制,再用10 M NaOH调pH至7.4(100 ml一般加450 μl),高温高压蒸汽灭菌15 min冷却后使用。 固体培养基加入琼脂1.5%。 10 M(或N)NaOH配制方法是称200 g NaOH加300 ml,搅拌充分溶解后定容至500 ml。 (二)溶液Ⅰ、 ...
I recovered DNA from gel by Millipore's kitIt's simple.Cut the band from gel and centrifuge for 10 minutesbut the efficiency is disappointedonly 20% or so. Can anyone reccomend me other methods?Thanks ...
问题:转化后无克隆菌产生 可能的原因:转化过程有问题或感受态细胞失活 建议:可通过转化pUC18/19等未切割的可用于抗性筛选的质粒,检测感受态细胞的转化效率和转化操作是否正确 问题:插入对照DNA片段的阳性率低 可能的原因:10×快速连接缓冲液稀释不当 建议:提供的T4 连接酶缓冲液为十倍浓度,10μl 反应体积加1μl T4 连接酶缓冲液 &n ...
About 1/2 to 1 cm of tail should be cut from properly marked mice (using toe or ear clipping etc) about the age of 2-3 weeks. Place these tails into marked 1.5 ml Eppindorf tubes for processing; they ...
Prior to getting cells: 1) Turn on 42 deg bath. Takes about 30 min to reach 42 deg. 2) Put 0.1 M sterile CaCl2 on ice. 3) One tube of cells is good for several transformations. For two transform ...
Hi Does enzyme digestion before bisulfite treatment make a big difference - i am having a few problems with incomplete conversion. If so can anyone reccomend me a good 'general' enzyme to use - I know ...
Protocol written by James Hermaundefined Methylation-specific PCR (MSP) is a simple rapid and inexpensive method to determine the methylation status of CpG islands. This approach allows the determination of ...
Materials: phenol:chloroform (1:1) chloroform 1.Add an equal volume of buffer-saturated phenol:chloroform (1:1) to the DNA solution. 2.Mix well. Most DNA solutions can be vortexed for 10 sec except f ...
甲基化研究对于基因的调控和肿瘤的发生有非常密切的关系。在一般正常的细胞中,基因调控区CpG岛处于非甲基化的状态。而当细胞发生癌变后,这些CG区域往往呈现甲基化状态。英国医学刊物《the Lancet》报道奥地利因斯布鲁克医学院的专家们早就可以通过检测大便中DNA的甲基化变化,把健康人的大便与结肠癌患者的大便区分开。大便标本中SFRP2 甲基化的程度是诊断结肠癌最灵敏的标记。研究人员发现 ...
1. 细菌离心后,加入溶液I蜗旋振荡时,发现菌体呈絮状不易混匀,或成细砂样。—— 很可能是细菌发生溶菌,可减少培养时间、降低培养温度试试看,通常降低培养温度 会使细菌生长更加稳定;同时也可以试试平板培养 ,培养后,用PBS将菌落洗下,再进行质粒的提取,固体培养基上细菌生长的要好一些。 2. 加入溶液II,菌液浑浊度没有发生明显变化。—— 裂解不完全, ...
I'm trying to do a southern blot and I have a trouble the bands I get are the same bands that appear in the genomic DNA digestion my probe is specific and it works in northern blot. Thanks -PPlopez- - ...
This procedure isolates DNA from agarose gels by filtration through a filter-paper column. The column is made in a 500 μl tube from a slurry of filter paper in TE buffer. Materials Whatman 3MM fil ...
实验原理: 体外通过基因工程手段所构建的含目的基因的重组质粒,选用转化和筛选技术, 可获得含重组的阳性克隆。在此阳性克隆中,DNA可在生物体系中大量扩增,繁殖, 保存以及表达目的基因的产物,这是PCR体外扩增DNA所不能替代的。配合DNA重组技术,所获得的,不同目的需要的阳性菌株已广泛应用于科研,医药生产和生物发酵等领域。 质粒转化不同细菌有不同的转化效率,转化效率的高低与实验的成败直接相关, 通 ...
提取DNA需要的仪器和试剂: ⑴ 1.5ml 离心管 ⑵ 移液管: 1000μl 200μl 40μl 各一支和移液管尖头: 100-1000μl 1-200μl 各一盒 ⑶ 微型滤柱(备用) ⑷ 小型旋转混合器一台 ⑸ 小型离心机: 可放入1.5ml 离心管和2ml收集管. ⑹ 恒温水浴 ⑺ 电冰箱: -20℃ 4 ℃ ⑻ 无水乙醇(自备) ⑼ 70 ...
1、用合适的酶切割DNA并电泳。 2、于紫外灯下从凝胶上切下所要的DNA带,装入含1×TBE缓冲液的透析代内,用夹子封好袋口,并检查有无漏孔。 3、将透析袋(纵长)与两极间的边线垂直放于电泳槽内电泳,4~5V/cm电泳至DNA贴紧袋壁。 4、取出透析袋,挤出凝胶块,吸出袋内液体放入1.5ml的离心管内,10000rpm离心5min。 5、吸出上清放入离心管内,加入等体积的饱和酚和等体积 ...
Preparation of C. elegans Genomic DNA Protocol by Andy Fires Lab Modified my Min-Ho Lee and Sudhir Nayak This protocol is based on the original Fire lab protocol for isolating genomic DNA from C. eleg ...