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炎症复合体的激活及调控研究进展 被引量:1
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作者 周洋 杨利峰 +3 位作者 尹晓敏 赵德明 张仲秋 周向梅 《动物医学进展》 北大核心 2015年第8期77-82,共6页
炎症复合体是天然免疫的重要组成部分,机体在感染或应激后模式识别受体直接或间接通过衔接子ASC募集procaspase-1组装形成多分子平台,触发procaspase-1切割形成活性形式,从而导致促炎因子,如IL-1β和IL-18的成熟和释放,发挥防御作用。... 炎症复合体是天然免疫的重要组成部分,机体在感染或应激后模式识别受体直接或间接通过衔接子ASC募集procaspase-1组装形成多分子平台,触发procaspase-1切割形成活性形式,从而导致促炎因子,如IL-1β和IL-18的成熟和释放,发挥防御作用。炎症复合体的激活机理尚不清楚并存在争议,目前已经提出4种激活模式,即溶酶体受损、活性氧簇的生成、钾离子外流和钙离子迁移,其中后两者更受公认。炎症复合体的激活受到多种因素的调控,自噬下调炎症复合体的活化,新蛋白质合成和泛素化/蛋白酶体通路对不同的炎症复合体的调控发挥的作用不尽相同。炎症复合体的激活机理及其调控研究广受关注,必将持续成为研究的热点。 展开更多
关键词 炎症复合体 活性氧簇 离子外流 钙离子迁移
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水泥基材料渗透溶蚀有限元模拟方法 被引量:11
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作者 贾攀 佘成学 《长江科学院院报》 CSCD 北大核心 2019年第5期108-115,共8页
渗透溶蚀现象在国内外水利工程中大量存在,但对其研究的手段迄今为止还比较单一,为此,探讨采用有限元计算方法研究水泥基材料的渗透溶蚀现象。首先,基于离子在水泥基材料中的水动力弥散与对流作用机理,根据离子质量守恒定律、Fick第二... 渗透溶蚀现象在国内外水利工程中大量存在,但对其研究的手段迄今为止还比较单一,为此,探讨采用有限元计算方法研究水泥基材料的渗透溶蚀现象。首先,基于离子在水泥基材料中的水动力弥散与对流作用机理,根据离子质量守恒定律、Fick第二定律、多孔介质渗流数学模型及达西定律建立三维渗透溶蚀过程中钙离子迁移数学模型;然后,结合钙离子迁移数学模型、固液平衡关系、孔隙率演化模型及扩散系数演化模型建立渗透溶蚀数学模型,并给出该模型的有限元计算方法;最后,通过对高水力梯度下的渗透溶蚀试验开展数值模拟,检验渗透溶蚀模型的正确性。计算结果与试验数据基本吻合,表明该方法能够用于模拟水泥基材料的渗透溶蚀过程。所做的研究工作为下一步水利工程中的渗透溶蚀模拟研究奠定了基础,对水利工程的结构安全性研究具有重要意义。 展开更多
关键词 水泥基材料 渗透溶蚀 有限元模拟 钙离子迁移 水动力弥散
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Apparent Mobilities of Na^+, K^+and Ca^(2+) Ions in Variable Charge Soil Colloid Systems
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作者 LI CHENG-BAOInstitute of Soil Science, A cademia Sinica, Nanjing 210008 (China) 《Pedosphere》 SCIE CAS CSCD 1992年第1期43-49,共7页
In this paper a simple method for determination of the apparent mobility of cation in a soil colloid system was described. With this method apparent mobilities of Na+, K+, and Ca2+ ions in the systems of the ferric lu... In this paper a simple method for determination of the apparent mobility of cation in a soil colloid system was described. With this method apparent mobilities of Na+, K+, and Ca2+ ions in the systems of the ferric luvisol, acrisol, and ferralsol were determined, and the reduction percentages of the mobilities were calculated. The results showed that the apparent mobilities of different cations at the same normality in a given soil system were in the order UNa> UK> UCa; those of the same cations among different soil systems were in the order ferralsol > acrisol > ferric luvisol, but the reduction percentages were in a reverse order, which among different cations at the same normality was Ca2+> K+> Na+ for ferric luvisol and acrisol systems, but was K+> Ca2+> Na+ for farralsol system. These results were interpreted in terms of different amounts of negative charge the clay fraction of different soils carries, and different mechanisms by which the soils adsorb the cations. 展开更多
关键词 apparent mobility DC conductivity method mobility reduction variable charge soil
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lon migration suppression mechanism via 4-sulfobenzoic acid monopotassium salt for 22.7%stable perovskite solar cells 被引量:2
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作者 Le Bai Fang Yao +16 位作者 Rui Wang Baibai Liu Dongmei He Qian Zhou Wenqi Wang Cunyun Xu Xiaobo Hu Shaoqiang Chen Qunliang Song Tingwei Zhou Donghwa Lee Pengjun Zhao Cong Chen Hua Yang Qianqian Lin Zhigang Zang Jiangzhao Chen 《Science China Materials》 SCIE EI CAS CSCD 2022年第12期3368-3381,共14页
The deep-level traps at grain boundaries(GBs)and halide ion migration are quite challenging for further enhancement of the stability and efficiency of perovskite solar cells(PSCs)as well as for the elimination of noto... The deep-level traps at grain boundaries(GBs)and halide ion migration are quite challenging for further enhancement of the stability and efficiency of perovskite solar cells(PSCs)as well as for the elimination of notorious hysteresis.Herein,we report a large-sized strongly coordinated organic anion GB anchoring strategy for suppressing ion migration and passivating defects in planar PSCs.The practical implementation of this strategy involves the incorporation of potassium salts containing a large-sized organic counter anion(4-sulfobenzoic acid monopotassium salt,SAMS)into the perovskite precursor.It has been found that anions within SAMS can be firmly anchored at GBs due to the strong coordination interaction between C=O and/or S=O at both ends of bulky anion and undercoordinated Pb^(2+)and/or halide vacancies,along with the hydrogen bond between–OH and formamidinium.SAMS can not only passivate shallowlevel defects but also cause more effective passivation of the deep-level defects.The GB manipulation strategy results in a reduced defect density,an increased carrier lifetime as well as suppressed ion migration,which in turn contributed to enhanced efficiency and stability of PSCs together with a thorough elimination of hysteresis.As a result,the SAMSmodified device with an outstanding fill factor of 0.84 delivers a significant improvement in efficiency(22.7%)in comparison with the control device(20.3%).The unencapsulated modified device demonstrates only little degradation after 1320 h at 60℃. 展开更多
关键词 perovskite solar cells ion migration suppression defect passivation large-sized organic anions potassium cations
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