Product Overview
Background
Plasminogen Activator Inhibitor-1 (PAI-1) is a glycoprotein and member of the serine protease inhibitor (serpin) superfamily. PAI-1 is the primary inhibitor of tissue-type plasminogen activator (tPA) and urokinase-type plasminogen activator (uPA). This inhibition exhibits antiproteolytic properties that can lead to myocardial infarction, thromboembolic disease with elevated levels of PAI-1. Additionally, PAI-1 is thought to play a role in the function of tissue remodeling and tumor metastasis.
Assay Principle
This is an ELISA (Enzyme-Linked Immunosorbent Assay) for the quantitative analysis of PAI-1 levels in biological fluid. This PAI-1 test kit operates on the basis of sandwich ELISA where active PAI-1 complexes with uPA and is quantified with the use of an HRP labeled secondary antibody. The functional or active PAI-1 will bind to the uPA coated on the well of the microtiter plate. The latent and complexed forms of PAI-1 will not bind and are discarded at a later washing step. Next, a PAI-1 primary antibody is added to the wells, binding to the captured PAI-1 on the microtiter plate. HRP conjugated secondary antibody is then added for detection of the active PAI-1. Quantitative test results are obtained by the measure and comparison of the sample and standard absorbance readings.
Product Documents
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决定酶促反应最大速度Vm的因素是什么？是同一底物，尽管加不同种酶，其Vmax都相同吗?可以画曲线图解释一下吗？可是根据米曼氏方程来看又有点矛盾，Km变大，Vmax也需变大，才可使v变大。所以题目所述到底应该怎么理解呢
调节至最适合温度（一般是37度），合适的酸碱度时，酶的活性最高
我是新手，来到丁香园看到有这么多的热心人，感到很高兴！！我也有很多问题需要大家的帮助！！实验已经作了一年了可是毫无进展，心里很是着急！！
我的课题是以外消旋的苯基乙二醇为底物，用假丝酵母催化生成手性纯的S-型苯基乙二醇，由于是老课题，所以目标是提高转化反应的底物浓度和菌体的使用批次（目前菌体使用一批后便不能再使用）。
我曾试过很多种方法，但均效果不大！我试着在转化过程中添加醛类，酮类，醇类作为辅助底物，增加菌体的使用批次。可效果不好，特别是添加了醇类后还有的起了反作用，因为我的这个转化过程中涉及到NAD和NADPH的再生。（其转化过程是酵母先催化将外消旋的苯基乙二醇变为酮，再将酮还原为醇，经过这一过程就将外消旋的苯基乙二醇变为手性纯的S-型了）
我还试过用固定化的方法，海藻酸钙包埋法，可是这样底物浓度就更低了！！
我现在不知道下一步该如何做了，很着急，请大家帮帮忙。谢谢了！！谢谢
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