A new adsorption chromatography procedure for the purification of calmodulin from bovine brain was developed using polymeric adsorbent 3520. Calmodulin was first isolated by DEAE-Cellulose column ...chromatography and further purified to apparent homogeneity following elution with 50% ethanol from the adsorbent column. Polyacrylamide gel electrophoresis showed one band either in the presence of Ca2+ or EGTA. The polymeric adsorbent 3520 is a non-polar polymer lacking exchangeable groups. The selective adsorption of calmodulin is based on hydrophobic interaction within the matrix, and is Ca2+ independent. Neither high salt (0.5 M NaC1) nor EGTA (5 mM) was able to elute the CaM from the adsorption column whereas ethanol (50%) eluted it completely. This method is simple to use and it provides highly purified calmodulin with high yield.
TD853.34; 为了有效处理电厂的两大工业废渣粉煤灰和脱硫石膏,实现火电厂固废资源化利用,将粉煤灰和脱硫石膏与生石灰、水泥以适当比例混合,通过开展泌水率、流动度、单轴抗压强度、X射线衍射、扫描电镜等试验,综合考虑流动性能和力学性能,得到适宜煤矿充填的粉煤灰-脱硫石膏充填材料配比方案.研究结果表明:粉煤灰、脱硫石膏、生石灰、水泥以3:1:1:1配比时,该矿物掺和料的料浆流动度可达300 m ...m以上,泌水率为4.71%.充填体7d抗压强度大于3MPa,28d抗压强度大于4MPa;随着粉煤灰与脱硫石膏比例的增加,3d、7d强度逐渐增大,14d、28d强度呈现先增大后减小的规律.粉煤灰-脱硫石膏充填材料水化产物主要包括钙矾石、水化硅酸钙、水合碳酸铝钙、二水石膏.水化产物会填充充填体内部的孔隙结构,宏观表现为提高了充填体强度.