乳清分离蛋白限制性脱酰胺及一些性质的表征

以脱酰胺度为评价指标,通过单因素试验确定乳清分离蛋白限制性脱酰胺反应条件,并获得脱酰胺乳清分离蛋白产物。在乳清分离蛋白浓度5%、谷氨酰胺酶添加量0.8 U/g乳清分离蛋白、36℃、p H 7的条件下分别反应1、4、8 h,制得脱酰胺度分别为1.5%、2.3%、2.9%的脱酰胺乳清分离蛋白。评价脱酰胺乳清分离蛋白产物界面性质的变化及对Fe~(2+)/Zn~(2+)等二价金属离子的螯合能力,结果表明,脱酰胺乳清分离蛋白产物的乳化稳定性、起泡性及对Fe~(2+)、Zn~(2+)的螯合能力均高于乳清分离蛋白,并随脱酰胺度的增大而略有提高。     

Robustness analysis of interdependent PV grids and communication network based on complex network

Currently, the Photovoltaic (PV) cloud network is an important research point in energy Internet. From the perspective of the robustness analysis of PV cloud network, traditional robustness index, the relative size of the giant connected component before and after the cascading , which is focused on the giant component, is not appropriate for the distributed PV network because of the big difference between PV generators and large power grid. In this paper, a new index is proposed, the minimum removed nodes number (MRNN), which can make the entire system collapse, to evaluate the robustness of PV cloud network system. The simulation results show MRNN can clearly indicate the system robustness under different parameters.