我国股票市场和外汇市场波动溢出效应分析

本文采用2005年7月至2008年12月间上证综合指数与美元兑人民币汇率对数收益率的日数据,通过建立DCC-MGARCH模型考察我国股票市场与银行间外汇市场的动态相关性,并通过建立BEKK-MGARCH模型考察两市场波动率之间的溢出效应。实证结果表明,从短期来看,我国股票市场波动与外汇市场波动之间存在相互溢出效应;但从长期来看,存在不对称性,只存在汇市波动向股市溢出

中国南方地区罗非鱼无乳链球菌的分子流行病学研究

从广东省以及海南省等地区养殖的患病罗非鱼体内分离、收集到多株致病菌,经生化分析和分子生物学鉴定,均为无乳链球菌。对这些菌株分别进行了耐药谱测定、分子分型试验以及分子血清型分析。药敏试验结果表明,2007—2010年分离到的无乳链球菌耐药谱基本相似;多位点可变数目串联重复序列分析(MLVA)试验中,选择5个高变异指数的可变数目重复位点(VNTR)进行分子分型,结果表明,所有鱼源无乳链球菌菌株为同一MLVA型,而作为对照的牛源无乳链球菌则明显不同;为了对这些菌株进一步分型,分别进行了分子血清型和表面蛋白抗原基因的检测,结果表明,鱼源无乳链球菌的分子血清型均为Ⅰa型,表面蛋白抗原均为alpha-C蛋白。这进一步说明了不同年份和不同地区的鱼源无乳链球菌在基因水平上为同一分子类型,具有相同的起源或传染源。同时也说明,我国南方地区罗非鱼无乳链球菌在这几年中未发生明显的遗传变异。这些结果为罗非鱼无乳链球菌病疫苗研制,疫病监测及药物防治的研究提供理论依据

连续硬膜外阻滞对婴幼儿血流动力学的影响

摘　要　探讨硬膜外阻滞麻醉对婴幼儿循环功能的影响: 前瞻性选择2岁以下小儿施行连续硬膜外阻滞麻 醉,定时测定阻滞前后收缩压、舒张压、平均动脉压、心率、每搏输出量、分钟心输出量、射血速率指数、心室射血 时间、肺液指数等9项指标及阻滞平面,其中阻滞平面达胸4 ( T4)和胸6 ( T6 )各10例;结果表明阻滞平面达T4和T6 两组患儿硬膜外阻滞后,除心率减慢之外,其他指标无明显改变, 提示连续硬膜外阻滞麻醉对婴幼儿血流动力 学无明显影响

近年来光合作用领域的前沿和热点研究——基于WOS高被引论文的科技术语分析

科技术语是科技论文的基本要素和重要特征,光合作用研究论文中存在大量的科技术语。基于数据驱动的科技术语分析能够对学科领域的动态发展和演变起到较好的揭示和印证作用。文章以VOSviewer软件为主要分析工具,对Web of Science数据库中光合作用领域近三年的高被引论文和热点论文中的科技术语进行计量分析和可视化呈现。分析比较的结果表明,近年来光合作用的研究热点集中在&quot;自然光合作用的机理探究&quot;&quot;光合作用与环境变化&quot;&quot;人工光合的应用和发展&quot;三个方向,&quot;光催化剂&quot;成为这几年光合作用领域研究的前沿。&nbsp; 引用：[1]蒋甜,许哲平,陈学娟,卢庆陶,杨辉霞,朱学军.近年来光合作用领域的前沿和热点研究&mdash;&mdash;基于WOS高被引论文的科技术语分析[J].中国科技术语,2021,23(01):60-70.</p

Effect of Thermal Treatment on Structure and Catalytic Performance of K_2MoO_4-NiO/SiO_2 Catalyst for One-Step Synthesis of Methanethiol from High H_2S-Containing Syngas

王 琪. Tel: (0551)2901458; Fax: (0551)2901450; E-mail: [email protected][中文文摘]在不同焙烧温度和焙烧气氛下对共浸渍法制备的K2MoO4-NiO/SiO2催化剂进行热处理,并采用X射线衍射、热重-差示扫描量热、氢气程序升温还原、拉曼光谱和电子自旋共振波谱等手段对催化剂进行了表征,同时考察了催化剂催化高硫化氢合成气一步法制甲硫醇的性能.结果表明,由于催化剂中所含柠檬酸氧化放热,空气中焙烧的催化剂发生严重烧结.随着焙烧温度的升高,八面体配位的Mo(Oh)逐渐向四面体配位的Mo(Td)转变,导致催化剂的还原能力降低,配位不饱和Mo(CO吸附位)减少,因而CO转化率降低.甲硫醇的生成与Mo–S–K相密切相关,而MoS2晶相表面主要生成烃类.与氮气中焙烧的催化剂相比,空气中焙烧的催化剂表面的MoS2相较多,而Mo–S–K相较少,因此具有更高的烃类选择性和更低的甲硫醇选择性. [英文文摘]K2MoO4-NiO/SiO2 catalyst samples prepared by the co-impregnation method were calcined at different temperatures and atmosphere. X-ray diffraction, thermal gravimetric-differential scanning calorimetry, hydrogen temperature-programmed reduction, Raman spectroscopy, and electron spin resonance techniques were used to characterize the catalyst samples. The catalytic performance of the catalyst for one-step synthesis of methanethiol from high H2S-containing syngas was evaluated. The results showed that the catalyst calcined in air sintered seriously because of the heat release from citric acid oxidation. With the increase of calcination temperature, octahedral coordination Mo(Oh) gradually changed into tetrahedral coordination Mo(Td), which made the reduction of Mo6+ more difficult, decreased the number of CO adsorption sites (coordinatively unsaturated sites) of Mo, and at last led to the decrease of CO conversion. Methanethiol synthesis was closely related to the Mo–S–K phase, and hydrocarbon synthesis was related to the MoS2 phase. Compared with the catalyst calcined in N2, there were more MoS2 phase and less Mo–S–K phase on the surface of the catalyst calcined in air, resulting in the higher selectivity for hydrocarbon and lower selectivity for CH3SH

Effects of Exogenous Nitric Oxide Donor SNP on Contents of Chlorophyll and Free Proline, Activity of Antioxidative Enzyme in Rice Seedlings under NaCl Stress

作者简介: 肖强(1970–), 男, 湖北恩施人, 博士, 研究方向为植物生理生化。Tel: 15971698508, E-mail: [email protected]通讯作者(Corresponding author): 郑海雷。E-mail: [email protected][中文文摘]在100mmolL-1NaCl胁迫下,研究了不同浓度一氧化氮供体硝普钠(sodium nitro prusside,SNP)处理对水稻叶片叶绿素、游离脯氨酸含量,叶片及幼根中愈创木酚过氧化酶(guaiacol peroxidase,GPX)、超氧化物歧化酶(super oxide dismutase,SOD)、过氧化氢酶(catalase,CAT)活性以及超氧阴离子产生速率等生理指标的影响。结果表明,适当低浓度SNP处理可以显著提高盐胁迫下水稻叶片中叶绿素和脯氨酸含量,并明显缓解盐胁迫下叶片和幼根受到的氧化性损伤;但在水稻幼苗不同器官,SNP调节的主要靶酶有所不同,在叶片中促进SOD和CAT活性,而在幼根中除SOD和CAT活性外,还提高GPX活性。[英文文摘] In this study, the contents of chlorophyll, free proline and the activities of GPX, SOD, CAT, and the producing rate of superoxide radicals in rice seedlings treated with a varying concentration of SNP under 100 mmol L-1 NaCl stress were investigated. The results showed that the contents of chlorophyll and free proline increased by treatment with low SNP concentration under salt stress. SNP alleviated significantly the oxidative damage caused by salt stress in leaf and root of rice seedlings. Different enzyme activities were regulated by SNP between leaf and root in rice seedlings under salt stress, SNP alleviated significantly the oxidative damage via promoting SOD and CAT activities in rice leaf, whereas, via regulating GPX activity mainly besides promoting SOD and CAT activities in root.国家自然科学基金项目(30770192,30670317,30271065);厦门大学“新世纪优秀人才支持计划”项目(X07115);湖北民族学院博士启动基金项

纳米硒联合聚维酮碘对手术感染杀菌的效果

目的负载多功能纳米硒聚维酮碘（PVP-I@Se）消毒剂对金黄色葡萄球菌（SA）、耐甲氧西林金黄色葡萄球菌（MRSA）的杀菌效果，为皮肤手术部位消毒提供实验依据。方法实验分为PVP-I组（对照组）与PVP-I@Se组（实验组），两组的碘浓度梯度相同，分别为50、75、100、200和400 μg/mL，实验组硒浓度2 μg/mL，对照组不添加硒，比较两组不同的消毒液对SA、MRSA的消毒效果，检测指标包括最低抑菌浓度（MIC）和最低杀菌浓度（MBC）；碘浓度50 μg/mL时的最短杀菌时间；碘浓度200 μg/mL、400 μg/mL时的抑菌圈大小。结果对照组对SA、MRSA的MIC均为79.17 μg/mL、实验组分别为54.17和70.83 μg/mL。而对照组对SA、MRSA的MBC分别为129.17和150.00 μg/mL，实验组分别为70.83和87.50 μg/mL。碘浓度50 μg/mL时，对照组对SA、MRSA的最短杀菌时间为130 s、140 s，实验组分别为65 s、75 s。碘浓度200 μg/mL时，对照组对SA、MRSA的抑菌圈直径分别为7.67 mm、8.33 mm，实验组均为9.50 mm。碘浓度400 μg/mL时，对照组对SA、MRSA的抑菌圈直径分别为9.00 mm、9.33 mm，实验组分别为11.67 mm、12.00 mm。结论在聚维酮碘浓度为50、75、100、200和400 μg/mL时，分别加入浓度为2 μg/mL的硒，可增强其对SA、MRSA的杀菌效果、缩短作用时间。硒（SeNPs）加入PVP-I对SA、MRSA 的杀菌效果均有增效作用。但增敏效果SA较MRSA显著。MRSA的增效作用对碘浓度（400 μg/mL）需求较高。为临床精准选用消毒剂的浓度和作用时间，降低临床皮肤手术部位感染提供理论依据

Research advance in ecological effects of polynuclear aromatic hydrocarbons in mangrove wetland

作者简介: 孙娟, 女, 1982 年生, 硕士生。从事生理生态及污染生态学研究。E- mail: sunjuanlizzy@ sohu. com[中文文摘]多环芳烃(PAHs)是一类广泛存在于天然环境中的有机污染物,对生态环境和人类健康造成严重的潜在威胁。本文概述了红树林湿地中多环芳烃的来源和分布,其对红树植物的生理毒性效应、红树植物的生物修复作用和生物降解等方面的最新研究进展进行了总结,并对未来PAHs在红树林的研究趋势进行了展望分析。[英文文摘]Polynuclear aromatic hydr ocarbons ( PAHs) are ubiquitous org anic persist ent pollutant, w hich would cause potential risks to the environment and human beings. This paper summarized the origin and distribution of PAHs in mangrove, physiological effects of PAHs on mangrove plants, bioremediation o f mangrove plants, and biodegr adation of microbes in mang rove. Future research on PAHs in mangrove was reviewed.福建省自然科学基金重点资助项目(D002-0002

Preparation and biological safety of basic fibroblast growth factor/double-layered collagen composite

背景:胶原特殊的分子结构和生物活性有利于多种细胞黏附、增殖和分化,并可降解为新生组织提供足够空间。目的:制备一种复合负载碱性成纤维细胞生长因子的壳聚糖-肝素纳米粒子双层胶原基复合材料,并评价其生物安全性。方法:制备交联风干胶原膜和交联冻干胶原膜。将壳聚糖-肝素纳米粒滴于交联冻干胶原膜上,再将湿态交联风干胶原膜置于复合纳米粒子的交联冻干胶原膜上风干,即碱性成纤维细胞生长因子/双层胶原基复合材料。采用急性全身毒性试验、溶血试验、热原试验和细胞毒性试验评价其生物安全性。结果与结论:碱性成纤维细胞生长因子/双层胶原基复合材料为双层结构,一侧表面致密,另一侧疏松多孔。在其中间负载碱性成纤维细胞生长因子的壳聚糖-肝素纳米粒子呈不规则球形分布于胶原膜内侧面;急性全身毒性试验、热原试验、溶血试验均为阴性,细胞毒性为0级。说明碱性成纤维细胞生长因子/双层胶原基复合材料具有良好的生物安全性,对机体无毒,符合ISO10993-1评价标准。BACKGROUND: Collagen is a common used scaffold in tissue engineering, its specific molecular structure and biological activity are conducive to a variety of cell adhesion, proliferation and differentiation, and can speed up wound healing and degradation to provide sufficient space for new tissues.OBJECTIVE: To prepare a kind of inhomogeneous double layered collagen composite incorporated with basic fibroblast growth factor (bFGF) loaded chitosan-heparin (CS-Hep) nanoparticles, and to evaluate its biological safety.METHODS: The air-dried dense layer collagen membranes and freeze-dried loose layer collagen membrane were prepared respectively and then cross-linked by D-ribose (termed as CAM and CFM respectively).CS-Hep nanoparticles were prepared and then dropped on the surface of CFM.The wet CAM was laid on the surface of CFM with nanoparticles, and then air dried completely at 4 ℃.The obtained material was termed as bDM.Its physical and chemical properties were investigated.In addition, its bio-safety was also examined through acute systemic toxicity, pyrogen, hemolysis and cellular toxicity tests.RESULTS AND CONCLUSION: The bFGF/double-layered collagen composite was made up of double layers with one dense layer (CAM) and another loose layer (CFM).As part of bDM, CS-Hep nanopartiles with irregular global shape were aligned in the scope of D-period structure of the inner surface of CFM; the bFGF/double-layered collagen composite had no systemic acute toxicity, no cytotoxicity and pyrogen reactions as well as no hemolytic effect.The bFGF/double-layered collagen composite is prepared and found to have good biocompatibility and safety.Moreover, this material conforms to the ISO 10993-1, and can be used as a basic scaffold material in tissue engineering天津市科技支撑计划重点项目(08ZCKFSF02100);博士点基金项目(20101106110042)---

Honeycomb-Patterned Hybrid Films and Their Template Applications via A Tunable Amphiphilic Block Polymer/Inorganic Precursor System

通讯作者地址: Li,L(通讯作者),Xiamen Univ,Coll Mat, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, Coll Mat, Xiamen 361005, Peoples R China 2. Xiamen Univ, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 3. Chinese Acad Sci, Shanghai Inst Organ Chem, Shanghai 200032, Peoples R China 电子邮件地址: [email protected], we show a facile and versatile method-prepare highly ordered inorganic patterns on solid substrates by pyrolyzing UV cross-linked polymr/functional. precursor hybrid films. The crosslinked polymer matrix acted as structure-directing agent in a pyrolyzing process, whereas the functional precursor was converted into the skeleton of the micropatterns. The inorganic micropatterns could be further catalytically functionalized to grow CNT and ZnO nanorod arrays by simply changing different functional precursors. This simple technique offers new prospects in the field of micropatterns, nanolithography, and template.National Natural Science Foundation of China,50703032,20974089;Natural Science Foundation of Fujian Province,2009J06029; Ministry of Education of Chin