
DescriptionServes as molecular weight standards for electrophoresis for both agarose and polyacrylamide gel electrophoresis. Suitable for sizing of PCR products or other double-stranded DNA fragments. Fragments with size 500bp, and 1000bp are higher in intensity in comparison to other bands to serve as orientation points.
Storage Buffer10mM Tris-HCl (pH 8.0) and 1mM EDTA.Store at -20°C
6X Loading Dye Solution10mM Tris-HCl (pH 8.0), 60mM EDTA, 0.03% bromophenol blue, 0.03% xylene cyanol FF and 60% glycerol
Usage Recommendation Use 0.05-0.10μg of the DNA ladder per 1mm width of gel lane
Ordering Information
Catalog No | Description | Pack Size |
---|---|---|
NL1405 | VC 100bp Plus DNA Ladder | 50 μg |
NL1406 | VC 100bp Plus DNA Ladder | 5 x 50 μg |
NL1407 | VC 100bp Plus DNA Ladder (ready-to-use) | 50 μg |
NL1408 | VC 100bp Plus DNA Ladder (ready-to-use) | 5 x 50 μg |
DownloadManual
VC 100bp Plus DNA Ladder
Comparison Test Report
VC 100bp Plus DNA Ladder
PublicationThis Product Has Been Used In:Ihwan R, Uslan NW & Luchman, H (2020)Genetic diversity of Rhizophora mucronata on the western coast of Timor Island, Kuwait Journal of Science, 47(1): 65-71.Awad, A.M. et al. (2019)PCR and Nanotechnology Unraveling Detection Problems of the Seed-borne Pathogen Cephalosporium maydis, the Causal Agent of Late Wilt Disease in Maize, . International Journal of Nanotechnology and Allied Sciences, 3(2):30-39.Basel Saleh (2019) Molecular Characterization using Directed Amplification of Minisatellite-region DNA (DAMD) Marker in Ficus Sycomorus L. (Moraceae), . The Open Agricultural Journal, 13:74-81.Taweerodjanakarn, S.et al. (2019) Functional properties of Enterococcus faecalis isolated from colostrum drawn from Thai mothers, . International Food Research Journal,26(1):141-151.Orhan, Z. et al. (2018) Phenotypic and Genotypic Analysis of Gentamicin, Penicillin, Methicillin, Vancomycin, Linezolid and Tetracycline Resistance in Clinical Isolates of Staphylococcus aureus, . KSU Journal of Agriculture and Nature,21(6):957-965.Chong,S.Y., Rao, P.V., Soon, J.M. (2017). Identification of Escherichia spp. strains in street-vended beverages and associated preparation surfaces using 16S rRNA analysis, International Food Research Journal, Vol. 4, No. 4, 1811-1818Ghaffoori, M.H. (2017). Prevalence of Campylobacter jejuni In Chicken Meat Marketed In Baghdad Province, International Journal of Advanced Research in Biological Sciences, Vol. 4, No. 6, 1-11. (2017). Tang, J.Y.H. et al. (2016) Antibiotic Resistance Profile and RAPD analysis of Campylobacter jejuni Isolated from Vegetables Farms and Retail Markets Asian Pacific Journal of Tropical Biomedicine6(1), p. 71-75.Riaz, M., Mahmood, Z., Javed, M.T., Shahid, M.,Abbas,M., Ehtishan-ul-Haque, S. (2016) Drug resistant strains of Mycobacterium tuberculosis identified through PCR-RFLP from patients of Central Punjab, Pakistan. International Journal of Immunopathology and Pharmacology.29 (3). Pp443-449.Emine, S., Zainol, N., Salihon, J., Convey, P (2015). Mangrove Rhizosphere Soils: A Unique Natural Source of Pravastatin-Producing Penicillium Microfungi, International Journal of Extensive Research, No. 5, 79-87 (2015). Khalid, M.I. et al (2015) Prevalence, Antibiogram, and cdt Genes of Toxigenic Campylobacter jejuni in Salad Style Vegetables (Ulam) at Farms and Retail Outlets in Terengganu Journal of Food ProtectionProQuest. 78(1), p. 65-71.Kepel, B., & Fatimawali, D. (2015) Analysis of 16SrNA Gene and Mercury Reduction Ability of Mercury Resistant Bacteria Isolated from Feces of Patient with Mercury Amalgam at Puskesmas Bahu in Manado. Jurnal Kedokteran Yarsi23(1), p.45-55Shahin-Jafari, A. et al (2015) Effect of Long-term Exposure to Mobile Phone Radiation on Alpha-Int1 Gene Sequence of Candida albicans. Saudi Journal of Biological SciencesScienceDirect.Ali, R. et al. (2014) Role of Polymerase Chain Reaction (PCR) in the Detection of Antibiotic-resistant Staphylococcus aureus. Egyptian Journal of Medical Human GeneticsScienceDirect. 15(3), p. 293-298.Shakrin, N.N.S.M, M., S.N., Taib, N.M., Nording, S.A., Jamal, F., Desa, M.N.M. (2014)Genotypic characterization of Malaysian human isolates of Streptococcus pneumoniae from carriage and clinical sources. Khodadad, M., et al. (2013) Constuction of Expressing Vectors Including Melanoma Differentiation-Associated Gene-7 (mda-7) Fused With the RGD Sequences for Better Tumor Targeting. I Iranian Journal of Basic Medical SciencesP18(8), p. 780-787.Saedzadeh, A., Hosseinzadeh, S., Firouzi, R. (2013).Genotyping of Chlamydia trachomatis from endocervical specimens in Shiraz, Iran, Iranian Journal of Veterinary Research, Vol. 14, No. 3, 203-210 (2013).Tang, J.Y.H., et al. (2010) MPN-PCR Enumeration of Campylobacter spp. In Raw Chicken Meats and By-products. .Frontiers of Agriculture in China.ProQuest. 4(4), p. 501-506.Tang, J.Y.H., et al. (2010) MPN-PCR Enumeration of Campylobacter spp. In Raw Chicken Meats and By-products. .Frontiers of Agriculture in China.ProQuest. 4(4), p. 501-506.
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最近测序做了TRNAfragment,但是在验证测序结果上遇到了问题,TRF大小在30左右,按照mirna设计颈环引物跑PCR,结果测序为0的数据也能跑出来,后来师兄分析可能把成熟的TRNA也检测出来了,不知道有哪位大神可以指导下TRF的引物应该如何设计啊?
没法移动,也没有办法看信号强度啊?
本人,大学本科生小白,想问一下各位老师,sirna设计出来之后,用snapgene吧sirna与靶mrna进行序列对比为什么没有同源序列,还有如果我想检验sirna是不是脱靶,是不是可以将sirna序列与相关影响的非靶基因序列对比确定哪。
补充,还有说常见的有丝氨酸水解酶家族,有文献提及赖氨酸。请问这些是如何选择的
探针就是DNA弹针。用于检测特定的DNA片段。
基因探针,即核酸探针,是一段带有检测标记,且顺序已知的,与目的基因互补的核酸序列(DNA或RNA)。基因探针通过分子杂交与目的基因结合,产生杂交信号,能从浩翰的基因组中把目的基因显示出来。根据杂交原理,作为探针的核酸序列至少必须具备以下两个条件:①应是单链,若为双链,必须先行变性处理。②应带有容易被检测的标记。它可以包括整个基因,也可以仅仅是基因的一部分;可以是DNA本身,也可以是由之转录而来的RNA。
进行分子突变需要大量的探针拷贝,后者一般是通过分子克隆(molecular cloning)获得的。克隆是指用无性繁殖方法获得同一个体、细胞或分子的大量复制品。当制备基因组DNA探针进,应先制备基因组文库,即把基因组DNA打断,或用限制性酶作不完全水解,得到许多大小不等的随机片段,将这些片段体外重组到运载体(噬菌体、质粒等)中去,再将后者转染适当的宿主细胞如大肠肝菌,这时在固体培养基上可以得到许多携带有不同DNA片段的克隆噬菌斑,通过原位杂交,从中可筛出含有目的基因片段的克隆,然后通过细胞扩增,制备出大量的探针。
为了制备cDNA 探针,首先需分离纯化相应mRNA,这从含有大量mRNA的组织、细胞中比较容易做到,如从造血细胞中制备α或β珠蛋白mRNA。有了mRNA作模板后,在逆转录酶的作用下,就可以合成与之互补的DNA(即cDNA),cDNA与待测基因的编码区有完全相同的碱基顺序,但内含子已在加工过程中切除。
寡核苷酸探针是人工合成的,与已知基因DNA互补的,长度可从十几到几十个核苷酸的片段。如仅知蛋白质的氨基酸顺序量,也可以按氨基酸的密码推导出核苷酸序列,并用化学方法合成。
中文名为信使RNA,是由DNA的一条链作为模板转录而来的、携带遗传信息的能指导蛋白质合成的一类单链核糖核酸。mRNA作为蛋白质合成的模板,决定肽链的排列顺序。
tRNA
中文名为转运RNA,是具有携带并转运氨基酸功能的一类小分子核糖核酸。
rRNA
中文名为核糖体RNA,是最多的一类RNA,也是3类RNA(tRNA,mRNA,rRNA)中相对分子质量最大的一类RNA,它与蛋白质结合而形成核糖体,其功能是作为mRNA的支架,使mRNA分子在其上展开,形成肽链的合成。rRNA占RNA总量的82%左右。rRNA单独存在时不执行其功能,它与多种蛋白质结合成核糖体,作为蛋白质生物合成的“装配机”。
tRNA的功能:主要是携带氨基酸进入核糖体,在mRNA指导下合成蛋白质。即以mRNA为模板,将其中具有密码意义的核苷酸顺序翻译成蛋白质中的氨基酸顺序(见蛋白质的生物合成、核糖体)。tRNA与mRNA是通过反密码子与密码子相互作用而发生关系的。在肽链生成过程中,第一个进入核糖体与mRNA起始密码子结合的tRNA叫起始tRNA,其余tRNA参与肽链延伸,称为延伸tRNA,按照mRNA上密码的排列,携带特定氨基酸的tRNA依次进入核糖体。形成肽链后,tRNA即从核糖体释放出来。整个过程叫做tRNA循环(图3)。tRNA靠反密码子与mRNA识别,但并非一种反密码子只能识别一种密码子。例如反密码子CIG(I是次黄嘌呤核苷酸)能识别三种密码子。一般反密码子中的稀有核苷酸因配对不严格而能识别多种密码子,这种现象在生物学中称为“摆动性”tRNA是通过分子中3′端的CCA携带氨基酸的。氨基酸连接在腺苷酸的2′或3′OH基上,携带了氨基酸的tRNA叫氨酰tRNA,例如,携带甘氨酸的tRNA叫甘氨酰tRNA。氨基酸与tRNA的结合由氨酰tRNA合成酶催化,分二步进行:①氨基酸+ATP→氨酰-AMP+焦磷酸;②氨酰-AMP+tRNA→氨酰-tRNA+AMP。与一种氨基酸对应的至少有一种tRNA和一种氨酰-tRNA合成酶(见蛋白质生物合成)。tRNA还具有其他一些特异功能,例如,在没有核糖体或其他核酸分子参与下,携带氨基酸转移至专一的受体分子,以合成细胞膜或细胞壁组分;作为反转录酶引物参与DNA合成;作为某些酶的抑制剂等。有的氨酰-tRNA还能调节氨基酸的生物合成。在许多植物病毒RNA分子中发现有类似于tRNA的三叶草结构,有的也能接受氨基酸,其功能不详。向左转|向右转

