从人口城镇化、经济城镇化、社会城镇化、空间城镇化4个维度构建城镇化水平评价指标体系,从生态压力、生态治理、生态环境3个维度构建生态安全评价指标体系,依次计算黄河流域九省区城镇化水平指数(urbanization development level index...从人口城镇化、经济城镇化、社会城镇化、空间城镇化4个维度构建城镇化水平评价指标体系,从生态压力、生态治理、生态环境3个维度构建生态安全评价指标体系,依次计算黄河流域九省区城镇化水平指数(urbanization development level index,UDI)和生态安全指数(ecological security index,ESI),并采用灰色关联分析模型和解耦模型对2008—2018年黄河流域九省区城镇化水平与生态安全交互作用机制进行分析研究。结果表明:黄河流域九省区城镇化水平与生态安全整体呈上升趋势,UDI由0.24升至0.58,ESI由0.30升至0.41,但增幅逐渐减缓;城镇化水平与生态安全系统间关联度均高于0.6,处于中等关联与极强关联之间,具有较强的相互作用,人口城镇化对生态安全胁迫作用最大,关联度值高达0.741,生态治理对城镇化发展的约束作用最强,关联度值为0.726;黄河流域九省区城镇化水平与生态安全之间存在着较强的解耦作用,未来生态安全对城镇化发展的约束作用逐渐变强。展开更多
The study of interactions between peptides and synthetic polymers has aroused considerable interest recently.In the present paper,the interaction mechanism between adsorbent DMAPAM and two pep-tides,VVRGCTWW(V8)and CT...The study of interactions between peptides and synthetic polymers has aroused considerable interest recently.In the present paper,the interaction mechanism between adsorbent DMAPAM and two pep-tides,VVRGCTWW(V8)and CTWW(C4),was investigated at molecular level by NMR and molecular stimulation.The results demonstrated that the conformation of oligopeptides played a vital role in their adsorption capacity on the adsorbent.Weak interactions could incorporate with each other between V8 and DMAPAM because there was a hydrophobic cleavage in α-helix conformation of V8.So the ad-sorption capacity of DMAPAM to V8 was higher.This was significant to explore the interaction mecha-nism between peptides and biomaterials.展开更多
基金the National Natural Science Foundation of China(Grant Nos.50573034 and 20634030)
文摘The study of interactions between peptides and synthetic polymers has aroused considerable interest recently.In the present paper,the interaction mechanism between adsorbent DMAPAM and two pep-tides,VVRGCTWW(V8)and CTWW(C4),was investigated at molecular level by NMR and molecular stimulation.The results demonstrated that the conformation of oligopeptides played a vital role in their adsorption capacity on the adsorbent.Weak interactions could incorporate with each other between V8 and DMAPAM because there was a hydrophobic cleavage in α-helix conformation of V8.So the ad-sorption capacity of DMAPAM to V8 was higher.This was significant to explore the interaction mecha-nism between peptides and biomaterials.