4-硝.基.苯基苯硫,(4-Nitrophenyl)(phe

稳定表达具有生物活性的人重组对氧磷酶

of paraoxonase-1 activity in lysate The bioactivity of paraoxonase-1 present in the cell lysate was demonstrated by its ability to hydrolyse 4 mM phenyl acetate in 20 mM Tris HCl buffer pH 8.0, containing 1 mM CaCl2. As a control 10 mM EDTA was added

Assay for ß-galactosidase in E. Coli

, isopropyl-ß-thiogalactoside (IPTG), phenyl-ß-galactoside (PBG) and glucose (GLU).   We will use a non-biological (artificial) substrate for the enzyme, Ortho-nitrophenyl-ß-galactoside (ONPG). In the presence of ß-galactosidase ONPG is converted

多肽的基本常识

盐。 　　如果多肽在水中的溶解性有限，有几种选择可帮助溶解： 　　对碱性肽用稀乙酸（含Arg , Lys , His） 　　酸性肽用稀氨水（含Asp, Glu） 　　对极疏水的肽用10%有机修饰物（Acetonitnile , Methanol） 　　极不溶的肽用DM50或DMF 　　guanicline hydrochloride或脲的浓溶液也很有用， 与上述方法合用， 声处理也是溶解多肽的有效手段。 多肽的包装 　　目录中所有多肽除特别说明外，纯度为95~98