分子筛修饰电极中内电子传输机理的研究

【中文摘要】用电化学方法聚合分子筛孔道内的苯胺 , 以聚苯胺分子筛修饰电极为模型研究分子筛修饰电极的内电子传输机理 . NaY分子筛的离子交换点位被苯胺修饰后 , 通过电聚合制得聚苯胺分子筛修饰电极 ( Pan+Y-ZM E ),该电极通过聚苯胺链自身的电子跳跃来实现电子传输 , 且只有通过阴极富集后对溶液中Cd 2+才有响应 ,并能用于测定抗坏血酸。【Abstract】This paper is concerned with the mechanism of intrazeolite electron transfer in zeolite-modified electrodes (ZMEs) where the zeolite have been modified with polyaniline, First, data were obtained from ZMEs prepared with zeolite-Y loading aniline and the electropolymerizing of anilines was performed by cyclic voltammery, Polyaniline might not leak out from zeolite due to the bulk size of polyaniline being bigger than the channel of zeolite-Y. At the absence of electron transfer mediators, the Pan(+)Y-ZME showed the expected presence of electron hopping of adjacent polyaniline cations, Second, the data were obtained for the determining Cd2+ and ascorbic acid using Pan+Y-ZME. The Cd2+ might not be preconcentrated at open circuit and could be done at constant potential. At the absence of ion exchange between zeolite and surrounding electrolyte the electron transfer was performed via the electron hopping, i. e. by an intrazeolite mechanism; rather than by an extrazeolite mechanism. In addition, the ascorbic acid molecule and its anion could not cross zeolite film to base electrode therefore, its current was conducted also by the electron hopping between the chains of polyaniline, Experimental results indicate that the electron transfer of Pan(+)Y-ZME was dominated by intrazeolite processes

Chinese Public's Willingness to Pay for CO_2 Emissions Reduction: A Case Study from Four Provinces/Cities

利用非市场价值评估的方法——条件价值法,通过估算公众对CO_2减排政策的支付意愿,评估中国减缓气候变化政策的价值。利用从北京、上海、山东、福建4个省市收集的1653份有效调查问卷,建立支付意愿模型。结果表明,绝大部分参与者对CO_2减排政策持明显的支持态度,平均每人每年愿意支付201.86元人民币以支持减排行动。其中,北京地区的参与者CO_2减排的支付意愿最高,其次为福建和山东,上海参与者的支付意愿最低。模型显示,年轻、男性和中共党员参与者愿意支付较高的额度支持CO_2减排行动,收入水平高、对目前的生活状况满意、对气候变化问题有较好理解的参与者支付意愿也高。这一研究的政策启示是:中国低碳发展需要将公众对气候政策的支持意愿转化为切实的低碳行动,在设计碳税等减排机制时还要关注不同地区和收入群体在支付意愿和能力上的差异。The paper applies Contingent Valuation Method(CVM) to investigate the Chinese public's willingness to pay(WTP) for CO,emissions reduction policy.Face to face interviews were conducted to collect 1653 valid questionnaires from Beijing,Shanghai,Shandong Province and Fujian Province.A model was constructed to understand the factors that determined WTP.The results indicate that the Chinese public is willing to pay 201.86 CNY annually to support the policy in reducing greenhouse gas emissions.Participants from Beijing show the highest WTP,followed by participants from Fujian and Shandong,and those from Shanghai report the lowest WTP.The findings reveal that participants with higher income,higher satisfaction to current life,and being aware of climate issues are willing to pay more for CO:emissions reduction,and those who are young,male and members of the Communist Party also indicate a higher WTP.The results imply that translating the public's willingness to protect climate into actions should be taken into account in China's low carbon policy.There is a need to consider the difference of willingness to pay for emissions reduction among different social groups if the market-based mechanisms such as carbon tax would be designed to facilitate emissions reduction.教育部人文社会科学规划基金项目(09YJA790119

Mechanism of gut barrier injury and bacterial translocation in anxiety-depression induced degenerative neurosis

肠道屏障是脑-肠道交互作用的晴雨表。健全的肠道屏障对于维系肠道内微生态,抵御外源性病原体的侵入至关重要。焦虑抑郁症能够损害肠道屏障,破坏肠道菌群平衡。肠道屏障损伤引起肠道渗透性升高,肠腔细菌移位,促使外源性病原体进入血液循环和神经系统,启动系统性炎症反应。炎症反应对脑神经的损伤是诱导阿尔茨海默病和帕金森症发生、发展的主要原因。肠道屏障损伤还会破坏原有的肠道菌群结构,造成肠道菌群失调,不仅进一步损伤肠道屏障,还影响神经组织的结构和功能,是阿尔茨海默病和帕金森症形成的另一因素。此综述依据近年来的相关研究,从肠道屏障损伤的角度阐述了焦虑抑郁症触发退行性神经症的机制,强调维护肠道屏障功能在预防退行性神经疾病中具有重要的临床意义

一种固定化绿藻细胞的生物电极及其使用和测试方法

物理化学带填

固定化离子液体高效催化废弃食用油合成生物柴油（英文）

采用溶胶-凝胶技术和浸渍法制备了固定化1-(4-丁基磺酸)-3-甲基咪唑硫酸氢盐([(n-Bu-SO_3H)MIm][HSO_4])离子液体(IL),得到了一种适用于游离脂肪酸和甲醇酯化反应的不溶性IL催化体系,对合成的催化剂进行了表征,并对其活性进行了系统评价.结果表明,离子液体成功负载于载体上,该固定化Br?nsted性离子液体在油酸和甲醇酯化反应中具有非常好的催化活性,在最佳反应条件下,油酸的转化率高达98.4%.该催化剂用于催化高游离脂肪酸含量的废弃食用油酯化时,经后续碱催化酯交换反应,可获得收率高达94.7%的生物柴油

1,3-二油酸-2-棕榈酸甘油三酯的 干法分提富集工艺优化Optimization of dry fractionation process for enrichment of 1,3-dioleoyl-2-palmitoylglycerol

为提高1,3-二油酸-2-棕榈酸甘油三酯（OPO）的含量，以化学酯交换联合酶法酸解反应制备的OPO为原料，采用单因素实验和正交实验考察干法分提条件（结晶温度、冷却速率、养晶时间）对OPO含量及提升率、sn-2位棕榈酸（PA）占总PA含量及提升率和分提液油得率的影响，确定干法分提的最优工艺条件。结果表明，干法分提的最优工艺条件为结晶温度6 ℃、冷却速率4 ℃/h、养晶时间3 h，在此条件下OPO含量为（38.84±0.39）%，OPO含量提升率为（46.07±147）%，sn-2位PA占总PA含量为（91.08±0.16）%，sn-2位PA占总PA含量提升率为（4761±0.25）%，分提液油得率为（31.26±0.34）%。综上，通过干法分提可以获得OPO纯度更高的甘油三酯。 In order to improve the content of 1,3-dioleoyl-2-palmitoylglycerol (OPO), OPO prepared by chemical transesterification combined with enzymatic acid digestion reaction was used as raw material, the effects of dry fractionation conditions (crystallization temperature, cooling rate and crystal raising time) on the content and enhancement rate of OPO, the content and enhancement rate of sn-2 palmitic acid (PA) in total PA and the liquid oil yield of fraction were investigated by single factor experiment and orthogonal experiment. The results showed that the optimal conditions of the dry fractionation were as follows: crystallization temperature 6 ℃, cooling rate 4 ℃/h and crystal raising time 3 h. Under these conditions, the content and enhancement rate of OPO was （38.84±0.39）% and （46.07±1.47）% respectively, the content and enhancement rate of sn-2 PA in total PA was （91.08±0.16）% and（4761±0.25）% respectively, and the liquid oil yield was （31.26±0.34）%. In conclusion, triglyceride with higher purity of OPO can be obtained by dry fractionation

Electrochemical characterization of iron(II) and ruthenium(II) 1,10-phenanthroline complexes on MCM-41 mesoporous molecular sieve modified electrode

Electrochemical behavior of 1,10-phenanthroline complexes of iron and ruthenium, entrapped in MCM-41 mesoporous molecular sieve, was studied. The complexes entrapped had three quasi-irreversible redox processes correspondent to those having different coordination number, respectively; the complexes dissolved in aqueous solution had only a reversible redox process. The complexes entrapped could partly be dissociated due to hydroxyls in MCM-41 molecular sieve possessing high activity. The experimental results demonstrated that hydroxyls could act as ligand to coordinate with central ion, meanwhile original complexes were partly dissociated