武汉月湖水生植被重建过程中浮游植物的动态变化

2004年12月-2005年5月武汉市月湖水生植被重建过程中,对浮游植物进行逐月调查.结果表明,在营养盐浓度较高的条件下,浮游植物仍保持较低的生物量和密度,浮游植物的生长与温度保持一定的相关性,但与湖水营养盐浓度并不存在相关关系.菹草和伊乐藻能使水体的透明度保持较高的状态.浮游植物主要由隐藻和硅藻组成,能形成水华的一些常见种类并未随温度升高而出现,可能与这两种沉水植物的存在改变了浮游植物的群落结构有关.因此,在水温较低的冬季和春季进行水生植被重建是富营养化湖泊治理的有效途径

Effect of Yuhan Nuanwei Cream Acupoints Stiking Therapy on Gastric Mucosa TNF-α,PCNA of Mice with Chronic Atrophic Gastritis

目的:研究御寒暖胃膏贴敷胃经穴对慢性萎缩性胃炎(CAG)大鼠胃黏膜肿瘤坏死因子-α(TNF-α)、增殖细胞核抗原(PCNA)表达的影响,探讨御寒暖胃膏贴敷胃经穴对慢性萎缩性胃炎癌前病变CAG大鼠胃黏膜损伤修复的作用机制。方法:大鼠随机分为正常组、模型组、御寒暖胃膏贴敷胃经穴组、药物对照组,采用综合干预方法复制慢性萎缩性胃炎癌前病变大鼠模型,肉眼下观察大鼠胃黏膜损伤指数,光镜下观察胃黏膜组织的病理变化,采用酶联免疫分析法测定胃黏膜细胞中TNF-α、PCNA的表达水平。结果:与正常组比较,模型组的大鼠胃黏膜组织病理学检查提示存在腺体的萎缩和一定程度的细胞异型增生,大鼠胃黏膜细胞中TNF-α、PCNA的表达水平升高,差异有统计学意义(P<0.05);与模型组比较,御寒暖胃膏贴敷胃经穴组和药物对照组大鼠胃黏膜组织的病理损伤得到修复,大鼠胃黏膜细胞中TNF-α、PCNA的表达水平降低,差异有统计学意义(P<0.05);结论:御寒暖胃膏贴敷胃经穴可以促进CAG大鼠胃黏膜损伤的修复,该作用可能是通过调节胃黏膜细胞TNF-α、PCNA的表达水平来实验的。Objective:To study the effect of Yuhan Nuanwei cream(YNC)acupoints stiking therapy on gastric mucosa tumor necrosis factor-α(TNF-α) and proliferating cell nuclear antigen(PCNA) expression of mice with chronic atrophic gastritis(CAG),so to discuss the renovation mechanism of YNC on CAG precancerous lesions. Methods:The mice were divided into normal group,model group,YNC group,drug control group. Duplicate mice model with CAG precancerous lesions by the method of comprehensive intervention,observe gastric mucosal lesion index of mice with the naked eyes,observe pathological change of gastric mucosa tissue under light microscope,measure expression level of TNF-α and PCNA in gastric mucosa cells by the method of enzyme-linked immunoassay. Results: Comparing with normal group, mice gastric mucosa histopathological examinations in model group reminded that there exist gland atrophy and some degree of cell atypical hyperplasia,the expression level of TNF-α and PCNA in mice gastric mucosa cell are increased,differences being significant(P<0.05). Comparing with model group,pathological damage of mice gastric mucosa tissue in YNC group and drug control group obtained obvious repair,the expression level of TNF-α and PCNA in mice gastric mucosa cell were dropped, differences being significant(P<0.05).Conclusion:The therapy of YNC acupoints stiking therapy can promote the renovation of CAG mice gastric mucosal lesion. This fuction may be experimented by regulating the expression level of TNF-α and PCNA in mice gastric mucosa cell.深圳市科技研发资金项目(JCYJ20130401105615482

Effect of RF power on the structure and properties of ZnO∶Al films deposited by magnetron sputtering

采用RF磁控溅射技术以ZnO:Al2O3(2 wt%Al2O3)为靶材在石英玻璃衬底上制备多晶ZnO:Al(AZO)薄膜,通过XRD、AFM、AES以及Hall效应、透射光谱、折射率等手段研究了RF溅射功率(50~300 W)对薄膜的组织结构和电学,光学性能的影响。分析表明:所制备的AZO薄膜具有c轴择优取向,并且通过对不同功率下薄膜载流子浓度与迁移率的研究发现对于室温下沉积的AZO薄膜,晶粒间界中的O原子吸附是影响薄膜电学性能的主要因素。同时发现当功率为250 W时薄膜的电阻率降至最低(3.995×10-3Ω.cm),可见光区平均透射率为91%。Aluminum doped zinc oxide films are deposited by magnetron sputtering using a zinc oxide target doped with Al2O3(2 wt%.) with different RF powers on quartz substrate.The structural and compositional characteristics of the films are investigated by XRD,AFM,SEM,AES and XPS.respctively,while the electrical and optical properties of the thin films are studied by the Hall measurement and spectrophotometry,respectively.It has been found that all films deposited are c-axis preferred orientation perpendicular to the substrate with porous crystalline structure.The lowest resistivity obtained in this study is 3.9×10-3 Ω·cm for the film deposited at 250 W,and the average transmittance is 91% in the visible range.By comparing the samples deposited at various RF power,the oxygen absorption in the grain boundaries is the dominant factor which influences the electrical property of the AZO thin film

Design and thermal analysis of high performance MEMS capacitive pressure sensor

为了进一步提高接触式电容压力传感器的性能,设计了一种高性能双凹槽结构的接触式电容压力传感器,并对该传感器在高温环境中的总体性能进行了分析。推导了热传导和热弹性理论,并对影响传感器热分析的各个因素与温度的依赖关系进行了描述;在整个分析过程中,使用AnSyS软件并结合有限元方法对全尺寸传感器的热效应进行模拟。结果表明,在接触工作状态双凹槽接触式电容压力传感器的温度对输入(压力)-输出(电容)特性的影响是线性的,且线性范围内初始压力随温度的升高而降低;当温度载荷为550 k时,双凹槽结构的灵敏度为1.21x10-6Pf/PA,比传统单凹槽的0.8x10-6Pf/PA高出50%,表明该压力传感器有着非常优异的高温特性。To improve the high temperature properties of touch mode capacitive pressure sensors,a Double-cave Touch Mode Capacitive Pressure Sensor(DTMCPS) is proposed and its overall performance in high temperature environment is analyzed significantly.Firstly,the theories of heat transfer and thermo-elasticity are deduced,and effects of many temperature dependence factors on thermal analysis of this sensor are described.Then,Finite Element Method and ANSYS software are used to simulate the thermal effect of the full dimension sensor during this analysis.The results indicate that the influence of temperature on the input(pressure load) and output(capacitance) characteristics is linear in a touch operation state of this DTMCPS,and its initial pressure of linear range reduces with temperature increasing.Furthermore,the sensitivity of double-cave structure sensor is 1.21×10-6 pF/Pa at 550 K,which has been 50% up on 0.8×10-6 pF/Pa of the traditional single-cave structure.These results show that this sensor has excellent high-temperature performance.国防军工科研资助项目(No.XDTH2009232A

Structural,Electrical,and Optical Properties of Transparent Conductive Al-Doped ZnO Films Prepared by RF Magnetron Sputtering

室温下采用RF磁控溅射技术在石英衬底上制备了多晶ZnO:Al(AZO)透明导电薄膜,通过XRD,AFM,AES,Hall效应及透射光谱等测试研究了RF溅射功率、氩气压强对薄膜的结构、电学和光学性能的影响.分析表明:在最优条件下(溅射功率为250W,氩气压强为1.2Pa时),180nmAZO薄膜的电阻率为2.68×10-3Ω.cm,可见光区平均透射率为90%,适合作为发光二极管和太阳能电池的透明电极.所制备的AZO薄膜具有c轴择优取向,晶粒间界中的O原子吸附是限制薄膜电学性能的主要因素.Highly conductive transparent Al-doped zinc oxide(AZO)films with highly(002)-preferred orientation were successfully deposited on glass substrates at room temperature by RF magnetron sputtering.Optimization of deposition parameters was based on sputtering RF power and Ar pressure in the vacuum chamber.AZO films of 180nm with an electrical resistivity as low as 2.68×10-3 Ω·cm and an average optical transmission of 90% in the visible range were obtained at RF power of 250W and Ar pressure of 1.2Pa.The effect of chemisorption of oxygen on the grain boundary would capture electrons from conduction band and lead the formation of potential barriers among the crystallites,which will influence the electric property of the AZO thin films.The films have satisfactory properties of low resistance and high transmittance for application as transparent conductive electrodes in light emitting diodes(LEDs)and solar cells

Research and Simulation of Combinatorial Calculation of Combined Balance

分析了组合秤的基本结构,详细阐述了组合秤的两种不同工作原理。进行了基于VISuAl bASIC的组合计算仿真程序设计,对组合秤不同组合计算模型进行了仿真,并对仿真结果进行了分析。The basic structure and working principle of combined balance was introduced and analyzed.The simulation program of combinatorial calculation was programmed with Visual Basic; simulation of different combinatorial calculation model of combined balance was carried out; and the simulation result was analyzed

一种检测蓝藻质粒的定量PCR试剂盒及应用

本发明公开了一种检测蓝藻质粒的定量PCR试剂盒及应用，普通PCR反应液I包含针对聚球藻anl50基因设计的一对特异性引物，普通PCR反应液II包含针对聚球藻CDS：ABB57481.1基因设计的一对特异性引物，定量PCR反应液I包含针对聚球藻anl50基因设计的一对特异性引物，定量PCR反应液II中包含针对聚球藻CDS：ABB57481.1基因设计的一对特异性引物，其中扩增anl50基因的普通PCR上游引物与该基因的结合位置在其定量PCR上游引物与该基因结合位置的上游，anl50基因的普通PCR下游引物与该基因的结合位置在其定量PCR下游引物与该基因结合位置的下游。该试剂盒快速检测蓝藻质粒的拷贝数，具有高灵敏度、特异性、稳定性和重现性。适用于蓝藻质粒DNA的定量检测，对于检测蓝藻细胞的DNA损伤具有实际的应用价值。</p

一种中间格网可组合调换式水生植物共培养装置

本实用新型公开了一种中间格网可组合调换式水生植物共培养装置，玻璃凸条用玻璃胶固定在矩形共培养玻璃缸的第一长侧面、第二长侧面的中间位置，共培养框架两侧的凹槽尺寸与玻璃凸条大小相匹配，共培养格网可根据实验需要选择单面或双面覆于共培养格网框架的正反两个框面，四个角落均用铆钉插于共培养框架的四个铆钉孔中来固定格网，固定好共培养格网的共培养框架对准玻璃凸条插入。该共培养装置结构简单，操作方便，成本低廉，比传统共培养玻璃缸具有更高利用率和研究效果。实验结束后的格网能方便的从框架上取下，清洗、晾干、消毒后能重复利用，大幅度减小了实验误差，提高了实验效率以及实验的准确率、精确度。</p

一种利用荧光检测微囊藻细胞DNA损伤的方法

本发明公开一种利用荧光检测微囊藻细胞DNA损伤的方法，其步骤：（a）将待检测样品和对照样品均分别平均分成三小组；（b）去除细胞角质鞘：离心收集样品中藻细胞并重悬浮于SE缓冲液中洗涤；（c）细胞裂解：将细胞分别重悬浮于Lysis裂解液，加入蛋白酶K和十二烷基磺酸钠，使细胞裂解；（d）细胞DNA链解旋：改变pH，使T、P和B样品在不同条件下解旋；（e）染色：分别向以上T、P和B样品中加入Hoechest 33258染色；（f）荧光测定：离心后于荧光检测器中检测上清液的荧光强度；（g）结果计算：根据待测样品和对照样品中T、B和P样品的荧光来计算DNA链的断裂水平。本方法易于掌握，并且灵敏度高，DNA链上单个断裂位点即可检测到。</p

Advances in Causes and Treatment of Autism

自闭症是一种发育障碍类疾病,病程可持续一生,难以逆转,且患病率逐年升高,已给家庭和社会造成巨大的经济和社会负担.然而,自闭症的病因尚未完全明晰,缺少有效的治疗和干预方法.自闭症是生物性疾病,受基因和环境因素共同影响,环境可能是主要影响因素.自闭症儿童大脑早期发育异常可能是自闭症发病的直接诱因,神经毒性物质、营养物质、代谢产物和神经活性物质等都可能是自闭症的病因.一些自闭症患者存在染色体异常和基因变异,同时,更多的病例在胃肠道症状等其他方面也表现异常.自闭症患者中较高比例的胃肠道异常症状与患者肠道微生物紊乱关系密切,因此推论,微生物、肠道与大脑构成的菌-肠-脑轴可能在自闭症的发病过程中起重要作用.针对不同的影响因素,目前,已有多种干预方法,包括生物和非生物疗法.生物疗法包括:抗生素、药物和饮食等,其中,以肠道微生物为靶点的检测与干预的自闭症疗法将是未来的趋势,用益生菌和粪菌移植进行干预也日趋引起关注.虽然,这些疗法都有患者在使用,但多数疗法并不能有效改善自闭症核心症状,仍缺乏完整有效的安全性和有效性评估,因此,今后应加强系统性的控制研究,开展针对菌-肠-脑轴的病因探索和微生物干预研究.</p