Restriction enzyme digestions are performed by incubating double-stranded DNA molecules with an appropriate amount of restriction enzyme in its respective buffer as recommended by the supplier and at ...
Restriction enzymes are expensive ($40 to $200 a vial): keep the enzymes at -20℃. Plan your digests to be small and convenient. The digest is composed of DNA sample (volume should not be more than abo ...
This is a question asked quite a bit most recently (late September 1995) in the newsgroup. Here are two methods and who submitted them. ...
本方法的核心部分是医科院基础所的生化脂蛋白组的吴刚老师所创,我在其基础上进行了一些改动,主要是DNA回收上采取了更简单的方法。(本方法最适用于双酶切制作片断并进行克隆 的情况。对于分步酶切制作片断,也可以使用本方法,但需要加倍起始酶切DNA的量。)
(一) 鼠肝DNA的制备
I usually use Linear polyacrylamide as a carrier for DNA precipitation by EtOH. I have read about using glycogen as a carrier I would like to know if anyone knows a method avoiding not to use acrylami ...
真核细胞的mRNA在加工过程中有一个比喻为“穿鞋戴帽”的过程,因此mRNA的3'末端都带有一段Poly A,这是利用逆转录酶制备cDNA文库的基础。但是由于cDNA的5'端的序列各不相同,如何获得全长的cDNA,如何扩增由微量的mRNA逆转录得到的cDNA文库、如何利用已知片断序列得到全长的cDNA(即RACE),曾经是一个令人困扰的问题。
I have read some books but cannot find the answer.I think NaAc may increase the ionic strength to stabilize DNA duplexes.Is it right?
Core protocol for both mouse and chick embryos Cepko/Tabin lab Embryo preparationFix embryos in fresh 4% paraformaldehyde (or a thawed frozen aliquot) in PBS at 4° C overnight. Dissect embryos (as nee ...
IntroductionNorthern blotting nuclease protection assays and RT-PCR are frequently used to analyze gene expression. While qualitative results from these assays are sometimes sufficient most researcher ...
目的:了解ATP生物合成的意义;掌握无机磷的测定方法;掌握DEAE-纤维素薄板层析法测ATP的形成。原理:在适当条件下,酿酒酵母分解发酵液中的葡萄糖,释出能量,同时还利用无机磷,使AMP转变成ATP,一部分能量即贮存于ATP分子中。因此,在发酵过程中,可测得发酵液中的无机磷含量降低和ATP含量的上升。
RNA Marker ( RL1000; RL6000; RL10000) 可以进行一般琼脂糖凝胶电泳和变性琼脂糖凝胶电泳。以RL10000为例,具体使用方法如下:普通琼脂糖凝胶电泳时1.按下列组份配置RNA Marker样品。2.均匀混合后65℃加热10分钟,迅速冷却至室温(最好用PCR仪)。3.使用高质量的琼脂糖,用1×TAE Buffer制备3%凝胶,制胶时凝胶中请加入溴乙锭(最终浓度:1 ...
Northern BlotPreparation of Formaldehyde Agarose Gel The gel conditions (1% agarose 1X MOPS 6.3% formaldehyde) are designed for ~4 hours of electrophoresis. If longer times are necessary the formaldeh ...
小分子干扰RNA (Small interfering RNA ,siRNA ) 是一种非常有效的工具,能够在包括哺乳动物细胞在内的多个体系中抑制特定基因的表达,从而研究某个基因的功能或者是相关信息。但是这种强有力的方法的难题之一是需要设计,合成siRNA s 和验证其效果,从而找到最有效的siRNA s 。
1.NCBIshRNA资源库 http://cgap.nci.nih.gov/RNAi About RNAi on CGAPThe NCBI is part of the consortium supporting the preparation of human and mouse libraries containing RNAi constructs that target cancer-r ...
差异基因表达的研究受到了广泛的关注,常用的技术有DD-PCR;GENE-FISHING;GENE CHIP等。简单介绍如下: DDRT―PCR技术即mRNA差异显示聚合酶链式反应技术,此技术是以PCR技术和聚丙烯凝胶电泳技术为基础,结合银染或放射性自显影等显色技术,能快速有效地鉴定并克隆两个或多个平行材料之间的差异表达基因。DDRT―PCR技术的基本过程如下:①提取两组平行材料中的总RNA或m ...
编者按:不同生物中RNA 结构和功能多样性与生命多样性的关系等问题是当前生命科学重大基础研究的前沿,特别随着基因组、蛋白质组计划相继提出后,RNA 组学研究已经成为分子生物学研究的新的生长点。本期RNA 专题由王恩多院士牵头,共组织了八篇与RNA 研究相关的高质量文章。在此,向王恩多院士及各位专家对本刊的大力支持表示衷心的感谢!张筱晨, 周 惠, 屈良鹄~A中山大学生物工程研究中心,广州51027 ...
刘默芳,王恩多(中国科学院上海生命科学研究院生物化学与细胞生物学研究所,分子生物学国家重点实验室,上海200031)摘 要:小分子调控RNA,包括siRNA (small interfering RNA)、miRNA (microRNA)和piRNA (piwi interacting RNA)、hsRNA (heterochromatin associated small RNA)等,是当前生 ...
1.相似性序列发生Cross-react引起脱靶效应。2.监测手段:对脱靶效应的监测一般通过基因芯片来监测。Gene expression profiling对脱靶效应。3.脱靶效应的特性:转录物表达模式有序列特异性和靶特异性两种。4.大部分脱靶效应具有siRNA序列特异性。低浓度也可能产生脱靶效应,不仅仅是高浓度能产生脱靶效应的假象。
Overview With this protocol transcripts that were initiated from specific genes by RNA polymerases prior to permeabilization can be measured. Instead of a nuclear extract permeabilized cells are ...

