Product Specification
Item # 4002: Hepatitis E Composite antigen
Concentration: See vial
Mass/vial: 1mg
Volume/vial: 0.1ml
Diluent: PBS
Purity : Approx. 95%
Stabilizer: None
Preservative: None
Storage: -75°C
Physical State: Frozen Liquid
Stability: At least 2 years at -75°C.
Applications:
Description:
Purification:
Specificity:
Biological Activity: Not determined.
Application and Instructions for use
Glossary
Gene and Gene Products
Structural Proteins: Structural proteins – the products of gag, pol and env genes, which are essential components of the retroviral particle.
Regulatory Proteins: Regulatory proteins – tat and rev proteins of HIV/SIV and tax and rex proteins of HTLVs; essential for viral expression in infected cells.
Accessory Proteins: Accessory proteins – additional (non-regulatory) virion – and non virion-associated proteins produced by HIV/SIV retroviruses: vif, vpr, vpu, vpx, and nef. Although, the accessory proteins are not necessary for viral propagation in tissue culture, they have been conserved in the different isolates; this conservation and experimental observations suggest that their role in vivo is very important.
gag
gag – group-sepecifc antigens or capsid proteins; the precursor is the p55 myristoylated protein, which is processed to p17 (Matrix) p24 (Capsid) and p7 (NucleoCapsid) proteins by the viral protease. Other small proteins are generated from the gag polyprotein.
pol
pol – (p66) generates the viral enzymes protease (p11), reverse transcriptase (p51), endonuclease and integrase (p32) after the processing of a gag-pol precursor polyprotein by the viral protease; gag-pol precursor is produced by ribosome frameshifting.
env
env – viral glycoproteins produced as a precursor (gp160) and processed to the external glycoprotein (gp120) and the transmembrane glycoprotein (gp41). The mature proteins are held together by noncovalent interactions; as a result substantial amount of gp120 is released extracellularly. The external glycoprotein (gp120) contains the binding site for the CD4 receptor.
tat
tat – transactivator of HIV gene expression; one of the two necessary viral regulatory factors (tat and rev) for HIV gene expression. Two forms are known, tat-1 exon (minor form) of 72 amino acids, and tat-2 exon (major form) of 86 amino acids. The electrophoretic mobility of these two forms in SDS gels is anomalous; they are approximately 16 kD and 14 kD in weight. Low levels of both proteins are found in persistently infected cells. tat is localized primarily in the nucleolus/nucleus; it acts by binding to the TAR RNA element and activating transcription from the LTR promoter. Post-transcriptional effects of tat have been postulated.
rev
rev – the second necessary regulatory factor for HIV expression. A 19 kD phosphoprotein localized primarily in the nucleolus/nucleus, rev acts by binding to RRE and promoting the nuclear export, stabilization and utilization of the viral mRNAs containing RRE.
vif
vif – viral infectivity factor, typically 23 kD; required for the efficient transmission of cell-free virus in tissue culture. In the absence of vif, the produced viral particles are defective, while the cell-to-cell transmission of virus is not affected significantly. It has been reported that the cellular localization is in the Golgi (vif is not found in the virion).
nef
nef – approximately 27 kD non-virion protein found in the cytoplasm of infected cells. Potentially myristoylated and associated with the inner plasma membrane. One of the first HIV proteins to be produced in the infected cells, it is the most immunogenic of the accessory proteins and may be used in the future for diagnosis and staging of the disease. NEF is dispensable and probably suffers counter-selection during ex vivo viral propagation in vivo. Recent evidence suggests that SIV nef is required for viral propagation in vivo.
vpr
vpr – virion-associated protein of unknown function found in HIV-1, HIV-2, SIVmac, and SIVmnd; typically 15 kD. May be homologous to vpx. Also called “rap” for rapid.
vpu
vpu – protein that promotes extracellular release of viral particles. Found only in HIV-1. Integral membrane phosphoprotein of 16kd; similar to M2 protein of influenza virus. It may be involved in env maturation. It is not found in the virion.
vpx
vpx – virion protein of 12 kD found only in HIV-2 infection. (vpx may have some homology with vpr).
Related research paper:
ebiomall.com
>
>
>
>
>
>
>
>
>
>
>
>
需要测量转染之后细胞某mRNA表达变化。
实验组给予转染，空白组做对照。
做PCR的时候肯定是要求两组的细胞计数是一样的，请问是转染之前还是转染之后对两组进行计数呢？如果样品两边计数不一样，怎么让做实验的时候两边细胞数目变成一样呢？
型 号：IC1000
品 牌：Countstar
单 价：45000.00元/台
最小起订量：1 台
供货总量：5 台
发货期限：自买家付款之日起 7 天内发货
这样的回答可能没分，好和不好都是比较出来的，一群国产的放在一起比总有个性能比较均衡，比较突出性价比好的，
还是没有和说那个厂家的好桂林的呢好像是优利特这个厂家在做，特康的前身呢就是百特，现在的百特呢基本上是在做试剂，这些东西呢。
也搜索的到的，不过答案还是比较接近的，但想知道的是国产那个厂家生产的比较好，而只回答了一半就和介绍了下国产的血球分析仪有那个几个大的厂家，没有和区分那个最好那个第二那个次点，或许一堆鸡蛋里实在挑不出骨头。
具所知呢迈瑞的好点特康实力没有迈瑞好，迈瑞吸引了一批外资在搞研发，桂林的呢好像有个优利特现在出血分析仪，他做的尿分析仪市场的占有还可以，血的反应不是很强烈。
实在是想找个内行的给比较下。
以前用countstar,一块计数板5个孔，后来实验室又换了biorad的TC20，一块板子两个孔，只能计两个数，一盒板子30片500块，价格越来越贵。这样我一个12孔板计个数就要花百来块钱啊。大家都是这么用的？板子是塑料的，有没有什么可以清洗之后重复利用的方法？
首先，电子细胞技术仪是机器计数，全自动计数，快速准确，比人工有效率多了，有条件可以购买一台计数器咯~~bodboge是我们在用的机器
其次，细胞计数板需要人工操作，取样什么的都要注意，不然就会有偏差，而且速度还很慢
所以，总的来说，肯定是机器计数会比较准确
