高温热浪与臭氧交互作用对高血压大鼠影响的实验研究

通过模拟高温热浪与臭氧协同暴露的实验研究,探讨高温热浪与臭氧交互作用对高血压大鼠的影响。应用人工气候环境暴露仓(Shanghai-METAS)模拟石家庄市2017年7月7日1时~10日23时实际气温和臭氧污染。将健康大鼠和高血压大鼠各自分为对照组和实验组(高温热浪与臭氧协同暴露组),每组各6只大鼠。将实验组放入暴露仓内,进行高温热浪与臭氧协同暴露,3 d后取出,采用腹主动脉终末采血。测量各组大鼠血浆中生化指标的含量,包括炎性因子[白介素-6(IL-6)、C-反应蛋白(CRP)、可溶性细胞间粘附因子-1(sICAM-1)、肿瘤坏死因子-α(TNF-α)]、血管舒缩因子[内皮素1(ET-1)、血管紧张素-Ⅱ(Ang-Ⅱ)、NO]、心血管危险因素[低密度脂蛋白胆固醇(LDL-C)、高密度脂蛋白胆固醇(HDL-C)、甘油三酯(TG)、总胆固醇(TC)]、氧化应激和血栓形成因子[丙二醇(MDA)、总超氧化物歧化酶(SOD)、纤溶酶原激活物抑制因子1(PAI-1)、D-二聚体(D2D)]。经高温热浪与臭氧协同暴露后健康大鼠和高血压大鼠肛温、血压升高,而心率降低。高血压大鼠和健康大鼠体内的IL-6、CRP、sICAM-1、TNF-α含量升高。高血压大鼠和健康大鼠的ET-1、Ang-Ⅱ、NO含量升高。高血压大鼠和健康大鼠LDL-C、TG、TC升高,而HDL-C降低。高血压大鼠和健康大鼠MDA、PAI-1、D2D含量升高,SOD降低。高血压大鼠在高温热浪与臭氧的协同暴露过程中更易受高温热浪与臭氧的影响。     

海洋硫酸多糖DPS对肾血管性高血压大鼠血清NO和血浆AngⅡ及ET—1含量的影响

采用肾血管性高血压大鼠模型（两肾一夹型）观察海洋硫酸多糖DPS对肾血管性高血压大鼠血清中一氧化氮（NO）和血浆中血管紧张素Ⅱ（AngⅡ）及内皮素－1（ET－1）含量的影响。DPS在肾血管性高血压大鼠造模第二天起分别以12．50,25．00,50．00mg/kg口服预防给药五周,每日给药一次。于约给药前、给药后第三周和第六周分别测定动态血压和心率。实验结束前,从每只大鼠取6mL,用试剂盒测定血清中NO的含量;用放射免疫法测定血冰中AngⅡ和ET－1的含量。血管紧张素转化酶抑制剂卡托普利（14mg/kg）作为本实验阳性对照药。结果：DPS口服预防给药五周,可显示增加血清中NO的含量和降低血浆中ET－1的含量,且呈剂量依赖性;DPS亦能降低血浆中AngⅡ的含量,但未见剂量依赖性。结论：海洋硫酸多糖DPS对肾血管性高血压大鼠的降压作用机制可能与其促进体内NO生成或释放、降低AngⅡ和ET－1的含量有关。     

“葛根-丹参”组方对鹌鹑动脉粥样硬化血管内皮功能的影响

目的:研究葛根丹参组方(乙酸乙酯部位,1:1)对鹌鹑动脉粥样硬化血管内皮功能的影响.方法:采用高脂饲料连续喂养16周建立鹌鹑动脉粥样硬化模型,观察葛根丹参组方对血管内皮功能指标及内皮氧化损伤指标的影响.结果:葛根丹参组方能明显升高血清NO的含量,提高NOS及SOD的活性,降低ET-1及MDA含量,恢复ET/NO平衡比值.结论:葛根丹参组方具有明显保护血管内皮细胞,改善血管内皮功能的作用,其作用可能与组方药物抗脂质过氧化,改善氧自由基代谢,增强机体抗氧化能力来实现,从而阻止AS的进一步发生和发展.     

曲尼司特对CsA慢性肾毒性大鼠AngⅡ和ET1的影响

研究曲尼司特对环孢素A(CsA)慢性肾毒性大鼠的肾脏保护作用,发现曲尼司特能减低环孢素A慢性肾毒性大鼠血浆和肾组织中AngⅡ的含量,并下调肾组织中ET-1的表达.结果表明曲尼司特可能通过下调环孢素A慢性肾毒性大鼠血浆和肾组织中AngⅡ的的水平以及肾组织中ET-1的表达,减轻肾脏病理损害,发挥其肾脏保护作用.     

模拟热浪期间突然强降温天气对高血压大鼠心血管系统影响的实验研究

通过模拟热浪期间突然强降温天气对高血压大鼠影响的实验研究,探讨热浪期间突然强降温对高血压大鼠心血管疾病的影响机理。应用TME1880气象环境模拟箱模拟了南京2006年6月19日5时至22日11时高温热浪期间突然强降温天气过程,将24只高血压大鼠随机分为实验组(包括热浪组、降温组和复温组)和对照组,每组各6只大鼠。把实验组放入模拟箱内,使其受热浪期间突然强降温天气过程影响,分别在模拟热浪期间突然强降温天气过程55、59和75 h时,先后取出热浪组、降温组和复温组监测基本生理指标;并采用断头采血和摘取心尖,测量各组高血压大鼠的热应激因子(HSP60、SOD、s ICSM-1、HIF-1α)、冷应激因子(NE、EPI、ANGⅡ)、血管收缩因子(ET-1、NO)以及心血管的危险因素(TC、TG、HDL-C、LDL-C和Tn-T)生化指标的含量。结果表明受高温热浪的影响,高血压大鼠的热应激因子除SOD含量明显下降以外其他热应激因子含量均明显增加,冷应激因子均明显下降,血管收缩因子ET-1下降而NO上升,心脑血管危险因素除TG上升以外其余因子均有不同程度的下降。热浪期间突然强降温可导致高血压大鼠热应激因子除SOD上升以外其余均下降,冷应激因子全部上升,血管收缩因子ET-1上升而NO下降,心血管危险因素均上升。通过分析可知,热浪可使得高血压大鼠动脉粥样硬化加剧,热浪期间突然强降温使得NE和ANGⅡ含量明显增加,加剧血压升高。受降温的影响Tn-T明显增多,说明突然的强降温冷刺激导致的血管收缩导致了心肌缺血,加上血脂四项的升高使得高血压大鼠心血管疾病进一步加重。初步探讨了热浪期间突然强降温天气对高血压大鼠心血管疾病的影响。     

北五味子多糖通过ERK1/2通路对AngⅡ诱导的心肌成纤维细胞增殖的作用机制

目的观察北五味子多糖(polysaccharide of Schisandra chinensis,SCP)对血管紧张素Ⅱ(AngiotensinⅡ,AngⅡ)诱导的心肌成纤维细胞(CFb)增殖作用,并探讨其作用机制.方法以培养的新生Wistar大鼠乳鼠CFb为实验模型,实验分为对照组、模型组、3个药物剂量组.采用胰酶消化、差速贴壁法培养CFb;四氮唑盐(MTT)比色法检测CFb增殖;羟脯氨酸(Hyp)法测定胶原含量;分光光度计测定CFb中超氧化物歧化酶(SOD)活力、丙二醛(MDA)水平;硝酸还原酶法和分光光度法分别测定不同干预条件下CFb培养液中一氧化氮合酶(NOS)活性及一氧化氮(NO)水平;免疫组化技术检测CFb中细胞外调节蛋白激酶(ERK1/2)蛋白表达.结果 SCP能够显著抑制AngⅡ诱导的CFb增殖(P0.05或P0.01),降低Hyp含量,提高SOD活力,降低MDA水平(P0.05,P0.01),提高NOS活性及NO水平(P0.05,P0.01),减低ERK1/2蛋白表达(P0.05,P0.01).结论 SCP可通过抑制ERK1/2信号通路提高NOS活性,并升高NO水平,增强抗AngⅡ诱导的CFb增殖能力.     

替米沙坦对血管紧张素Ⅱ诱导的心肌细胞肥大及p-ERK1/2的调节作用

观察替米沙坦(Telmisartan)对血管紧张素Ⅱ(Ang Ⅱ)诱导的心肌细胞肥大及p-ERK1/2表达的影响.通过培养新生大鼠心肌细胞,用相差显微镜计数心肌细胞搏动频率、细胞图像分析系统测量细胞体积、考马斯亮蓝法测定心肌细胞总蛋白含量、[3H]-亮氨酸掺入法测定蛋白合成速率作为心肌肥大指标;以ERK免疫沉淀活性试剂盒测定ERK活性;用Western-blot测定p-ERK1/2表达.实验结果显示Telmisartan能显著降低Ang Ⅱ诱导的心肌细胞搏动频率、体积、总蛋白含量、蛋白合成速率上升,同时对p-ERK1/2表达具有剂量、时间依赖性抑制作用.因此考虑Telmisartan可以抑制Ang Ⅱ诱导的心肌细胞肥大,其机制与抑制p-ERK1/2表达有关.     

运动对SHR大鼠心肌AngⅡ及AT1 mRNA表达的影响

观察运动对高血压大鼠心肌AngⅡ及AT1mRNA表达的影响,探讨运动对高血压大鼠心肌肥厚作用及机制。雄性SHR大鼠16只,Wistar大鼠8只（C组）,SHR大鼠随机分为安静对照组（S组）和运动组（T组）,每组各8只。T组每日进行90min的无负重游泳,每周6次,共9周。心肌AT1mRNA、AngⅡ、心系数等生化指标来研究和评价。结果显示：1．与C组比较,S组心系数显著升高（P〈0．01）;与S组相比,T组心系数明显降低（P〈0．05）。2．与C组相比,S组心肌和血浆AngⅡ显著升高（P〈0．05,P〈0．01）,心肌和血清NO含量显著降低（P〈0．05,P〈0．01）;与S组相比,T组心肌AngⅡ显著降低（P〈0．01）,心肌和血清NO含量明显升高（P〈0．05）。3．与C组相比,T组和S组心肌AT1mRNA表达显著降低（P〈0．01）;与S组相比,T组心肌AT1mRNA表达偏高,但无统计学意义。得出：长期规律的适宜运动可以明显降低SHR大鼠心系数和心肌AngⅡ含量,提示长期规律的运动能有效改善AngⅡ介导的心肌肥大。     

松花粉抗血小板及抗血栓作用研究

为研究松花粉的抗血小板及抗血栓作用,采用大鼠急性血瘀模型研究松花粉对血流变学的影响和对血小板聚集的影响,采用大鼠动-静脉血栓模型研究松花粉对血栓形成、COX-1和COX-2的表达以及对TXB_2的含量和TXB_2/6-keto-PGF_(1α)比值的影响.结果显示:松花粉可以抑制ADP诱导的血小板聚集,降低全血粘度、血浆粘度和红细胞压积水平;同时,松花粉可以显著降低血栓重量以及选择性抑制血管壁COX-2的表达,而不影响COX-1的表达,并且能够降低TXB_2的含量以及使TXB_2/6-keto-PGF_(1α)的比值趋于平衡.松花粉具有较好的抗血小板和抗血栓的作用,并且该作用与其能够高度选择性抑制COX-2的表达和调节TXB_2/6-keto-PGF_(1α)的平衡有关.     

藏药五味沙棘口服液对实验性慢性支气管炎大鼠模型的防治作用研究

为观察五味沙棘口服液对实验性慢性支气管炎动物模型的防治作用,初步探讨其作用机制,采用改良烟熏法复制大鼠慢性支气管炎模型,分为7组,按设计剂量分别灌胃给药,连续21d,末次给药后第2d取样,测定各组大鼠血清、肺组织及支气管肺泡灌洗液(BALF)中内皮素(ET-1)、一氧化氮(NO)肿瘤坏死因子(TNF-α)、白细胞介素(IL-8)、丙二醛(MDA)的含量.取部分肺组织进行病理学观察.结果显示模型组大鼠血清、肺组织及BALF中TNF-α、IL-8、ET-1、MDA含量均较正常组明显升高(P0.01),NO含量则明显低于正常对照组(P0.01).治疗组(除五味沙棘口服液低剂量组)大鼠血清、肺组织及BALF中TNF-α、IL-8、ET-1、MDA含量较模型组明显降低(P0.01或P0.05),NO含量则明显高于模型组(P0.01或P0.05),改善肺组织病理损伤.藏药五味沙棘口服液在一定程度上可治疗慢性支气管炎,且对肺组织具有一定的保护性.其作用机制可能与它增强肺组织自由基清除能力、改善机体功能状态、抑制炎性细胞因子的释放有关.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.