H2S对兔离体心脏心率的影响

目的:探讨硫化氢(H2S)对兔离体心脏心率的影响.方法:用标准微电极细胞内记录技术,观测硫化氢对兔右心房心肌细胞动作电位频率的影响.观测指标:自发放电频率(rate of pacemaker firing,RPF).结果:(1) 用200μmol/LNaHS 灌流时,和正常对照组相比,RPF显著减小(P<0.01).(2) 400μmol/L NaHS与对照组比较, RPF显著减小(P<0.01).和200μmol/LNaHS相比,RPF显著减小(P<0.01).(3)以上使RPF减小的效应在NaHS灌流3～5min出现,10min时已经有显著减小(P<0.01),25～30min达到高峰.结论:H2S可浓度依赖性的影响兔离体心脏的心率.     

氢冷汽轮发电机组漏氢问题探析

为减少氢冷汽轮发电机组运行安全的隐患,探析机组漏氢问题,分析了引起氢冷汽轮发电机漏氢的多种原因并提出对应的防范措施,从实践中总结出检测漏氢的四种方法。     

Protection of salvianolic acid B for human endothelial cells against hydrogen peroxide-induced oxidative damage

Salvianolic acid B(Sal B) is an active component of traditional Chinese medicine Salvia miltiorrhiza and is used to treat vascular diseases. To better understand its mechanism, the antioxidant capacities of Sal B was evaluated with human endothelial cells under oxidative stress. Human endothelial cells were pretreated with Sal B for 12 h followed by hydrogen peroxide for another 12 h. Production of reactive oxygen species (ROS), activities of superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX), and concentration of glu-tathione were measured: Protective effect of Sal B on the endothelial cells from hydrogen peroxide-induced damage ' was observed, and ROS production in the cells was found significantly inhibited. Sal B remarkably enhanced the activities of antioxidant enzymes SOD, CAT and GPX. Furthermore, Sal B up-regulated the intracellular glutathione concentration. The results indicate that Sal B protected endothelial cells from oxidative stress by improving the redox status of the cells through enhancing the antioxidant enzyme activities and increasing the reductive glutathione concentration after the oxidative challenge.     

反应条件对碳纳米管产率的影响

用镍铝催化剂催化裂解甲烷制备了碳纳米管;研究了反应温度及反应气氛对制备碳纳米管产率的影响。结果表明,碳纳米管的产率随温度的增加先增加,后减小,在550～650℃出现最大值,说明此温度范围最适合碳纳米管的生长;氢气预还原可以提高催化剂的反应活性。反应过程通氢气不但能提高催化剂的活性,同时也能提高产物的质量．上述两种情况均能提高碳纳米管的产率。     

Immobilization of functional nano-objects in living engineered bacterial biofilms for catalytic applications

Nanoscale objects feature very large surface-area-to-volume ratios and are now understood as powerful tools for catalysis, but their nature as nanomaterials brings challenges including toxicity and nanomaterial pollution. Immobilization is considered a feasible strategy for addressing these limitations. Here, as a proof-of-concept for the immobilization of nanoscale catalysts in the extracellular matrix of bacterial biofilms, we genetically engineered amyloid monomers of the Escherichia coli curli nanofiber system that are secreted and can self-assemble and anchor nano-objects in a spatially precise manner. We demonstrated three scalable, tunable and reusable catalysis systems: biofilm-anchored gold nanoparticles to reduce nitro aromatic compounds such as the pollutant p-nitrophenol, biofilm-anchored hybrid Cd_0.9Zn_0.1S quantum dots and gold nanoparticles to degrade organic dyes and biofilm-anchored CdSeS@ZnS quantum dots in a semi-artificial photosynthesis system for hydrogen production. Our work demonstrates how the ability of biofilms to grow in scalable and complex spatial arrangements can be exploited for catalytic applications and clearly illustrates the design utility of segregating high-energy nano-objects from injury-prone cellular components by engineering anchoring points in an extracellular matrix.     

氢原子n=4能级的斯塔克效应

利用微扰论,精确求解了氢原子在无外场时n=4的16重简并态能级波函数;并对处在电场中的氢原子n=4能级斯塔克效应进行了计算和分析.     

硫酸铁-硫酸配比对软锰矿氧化吸收H_2S的影响

研究了硫酸-硫酸铁酸性溶液氧化吸收硫化氢的工艺条件.采用廉价的天然原料,氧化吸收和铁盐再生同步完成,可以连续运行.工艺条件为:室温,0.5mol/L硫酸,1.0mol/L铁离子,硫化氢最大吸收率为99.2%.     

铁氰化钴修饰碳糊电极过氧化氢传感器的研究

研究了铁、钴、镍、铜与铋形成的普鲁士蓝及类普鲁士蓝的制备,并将它们用于修饰碳糊电极得到电化学传感器。研究表明：铁氰化钴修饰碳糊电极对H2O2有明显的电催化作用,将它用于H2O2的测定取得较好的结果,测定的线性范围为5．34×10^-6～5．34×10^-4mol·L^-1。该电极具有灵敏度高、稳定性和重现性好等特点。     

过氧化氢氧化苯甲醛合成苯甲酸的研究

在无溶剂、无相转移催化剂条件下,以过渡金属离子作为催化剂,碳酸钠作为碱性添加物,30%过氧化氢作为氧源,在常温搅拌下来催化氧化苯甲醛制备苯甲酸.最佳实验条件为:n(苯甲醛),n(碳酸钠)/n(催化剂),n(过氧化氢)为100:3:0.5:196,反应时间为1h,苯甲酸产率达84.2%.     

化合物(NIT-1′-MeBzIm)_2·(H_3bta)的合成及晶体结构

本文合成了一个新的化合物C39H44N8O10:(NIT-1′-MeBzIm)2.(H3bta)(NIT-1′-MeBzIm=2-{2′-[(l′-甲基)苯并咪唑]}-4,4,5,5-四甲基咪唑啉-3-氧化-1-氧基自由基,H3bta=1,2,4-苯三酸),并测定了其晶体结构.该晶体属三斜晶系,P1空间群,晶胞参数:a=7.372(12),b=8.705(15),c=15.65(3),α=100.81(3)°,β=97.47(3)°,γ=101.55(2)°,V=952(3)3,Z=1,Dc=1.369 mg/m3,最终偏差因子R1=0.1047,WR2=0.2650(I>2σ(I)),F(000)=414.该化合物通过分子间氢键和π-π堆积作用形成二维网状结构.