
Human CD11a (alpha L integrin) complexes with CD18 (beta 2 integrin) to form the LFA-1 heterodimer adhesion molecule which binds to three ICAM’s 1, 2, and 3, also designated CD54, CD102, and CD50 respectively. LFA-1 is expressed on lymphocytes, monocytes and neutrophils and plays a role in cell-cell adhesion (6).
Isotype: Murine IgG2a
Immunogen: Human monocytes
Specificity: Antibody 38 recognizes the I domain of the human integrin alpha L subunit (CD11a) of about 180 kd (1, 3, 7).
Functional Application: Antibody 38 blocks binding of ICAM-1 and ICAM-3 to LFA-1 at 5-10 ug/ml (7, 9).
References:
1. I. Dransfield & N. Hogg, (1989) EMBO J 12: 3759-3765.
2. I. Dransfield, et al, (1992) J Cell Biol 116: 1527-1535.
3. R.C. Landis, et al, (1994) J Cell Biol 126: 529-537.
4. A.M. Randi & N. Hogg, (1994) JBC 269:12395-12398.
5. P. Stanley, et al, (1994) EMBO J 13:1790-1798
6. Leukocyte Typing V (S.F. Schlossman, et al, eds.) Oxford University Press, Oxford, (1995) p. 1581-1592.
7. C.L. Holness, et al, (1995) J Biol Chem 270: 877-884.
8. M. Galdiero, et al. Microbiology 147 (2001), 2697-2704
9. T Mizuno, K Mori, et al (1996) J Biol Chem 272(2): 1156-63. PMID: 8995416
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比如,你的流动相比例、水相pH值、柱温等等条件稍有变化,色谱峰就对不上了。比如,一个碱性物质检测,流动相的pH值稍有波动,这个碱性物质的保留时间就前后波动的很厉害。这个时候就需要定位。
标准品:一般来说,标准品的结构是确定的,含量是确定的。结构就不用说了,保留时间一致就代表是这个东西了。含量,用外标的话就可以计算出样品的含量了。
这个定位品……我倒是没接触过定位品,就理解成用来定位的物质吧。标准品价格比较贵,自制的标准品通过结构确证可以用来定位。这样确保这个位置的色谱峰是这个物质。
校准品:公司指定用校准某检测系统(仪器+试剂+程序)考虑具基质效应情况赋予校准品校准值校准品必须专用于某检测系统北京标准物质网:www.biaowu.com

