四黄汤对急性肝损伤小鼠保护作用的研究

目的:探讨四黄汤对小鼠急性肝损伤的保护作用。方法:将60只小鼠随机分为四组,正常对照组15只、模型组15只、四黄汤高剂量组15只(40 g/kg/d生药)及四黄汤低剂量组15只(20 g/kg/d生药)。模型组每天灌以相同容积的生理盐水,连续2周。最后一次灌胃24 h后,除正常对照组外,所有小鼠以CCl4(0.1%10 mL/kg)腹腔注射,禁食不禁水8 h后断头取血及肝脏,检测血清谷丙转氨酶(ALT)的活性;部分肝组织制备肝匀浆,检测丙二醛(MDA)的含量,同时取相同部位的肝组织制备病理切片,观察小鼠肝组织损伤的程度。结果:急性肝损伤模型组血清ALT的含量明显高于正常对照组(P<0.05);四黄汤低剂量干预组血清ALT的含量则低于模型组(P<0.05),而高剂量干预组血清ALT含量则较模型组偏高(P<0.05);模型组肝组织MDA含量高于正常对照组(P<0.05);四黄汤低剂量及高剂量干预组肝组织MDA的含量低于模型组(P<0.05)。光镜下四黄汤低剂量干预组肝细胞损伤程度较急性肝损伤模型组减轻。结论:四黄汤对小鼠的急性肝损伤具有一定的保护作用。     

蜂花粉对四氯化碳所致小鼠急性肝损伤保护作用的病理学分析

探讨蜂花粉对四氯化碳(CCl4)所致的小鼠急性肝损伤的预防作用,观察其肝组织的病理变化。将48只小鼠随机分成6组:对照组、模型组、破壁花粉高、低剂量组、未破壁花粉高和低剂量组。第1～9天,花粉组每日灌胃给药1次,正常对照组与模型对照组灌胃给予等体积的饮用水,给药24 h后,用四氯化碳致小鼠急性肝损伤,观察比较各组小鼠的肝脏病理组织学变化。结果发现,病理学观察表明蜂花粉各剂量组可预防CCl4引起的肝细胞肿胀、气球样变等减轻急性肝损伤的肝脏损伤程度的病理改变。蜂花粉对CCl4引起的急性化学性肝损伤均有预防作用,破壁蜂花粉效果最明显,并存在量效关系。     

北五味子粗多糖对酒精诱导小鼠急性肝损伤的保护作用及其机制研究

目的观察北五味子粗多糖（SCP）对酒精诱导小鼠急性肝损伤的保护作用,探讨其作用机制.方法采用50%乙醇12 mL/kg灌胃建立小鼠急性肝损伤模型,检测小鼠肝质量指数,血清中转氨酶活性（ALT和AST）和甘油三脂（TG）水平,肝组织中丙二醛（MDA）、还原型谷胱甘肽（GSH）含量、一氧化氮合酶（NOS）活性以及HE染色观察肝脏病理学改变.结果北五味子粗多糖可明显降低小鼠肝质量指数,血清ALT,AST以及TG水平（P〈0.05）,同时使小鼠肝组织MDA水平和NOS活性显著下降,GSH水平升高（P〈0.05或P〈0.01）,并可改善小鼠肝脏病理损伤.结论 SCP具有明显的肝保护作用,机制可能与抗氧化有关.     

健胃胶囊的药效学研究

目的:探讨健胃胶囊对试验动物幽门结扎型溃疡、胃肠排空及镇痛的作用机理,为临床应用提供依据.方法:采用适当剂量灌胃给药的方法,随机分成4组(高剂量组、低剂量组、阳性对照组、阴性对照组),观察健胃胶囊对大鼠幽门结扎型溃疡面的抑制率、对小鼠胃体内甲基橙残留量的影响与给予刺激剂15min内各组小鼠发生"扭体"反应次数.结果:健胃胶囊有明显抑制大鼠胃部幽门结扎型溃疡面、增加小鼠胃体甲基橙残留量、减少小鼠对刺激剂发生"扭体"反应次数.结论:健胃胶囊具有防止幽门结扎所致胃溃疡的发生、调节胃肠蠕动功能以及明显镇痛作用.     

桔梗皂苷-纳米硒复合物对CCl4 致小鼠肝损伤的保护作用①

目的:研究桔梗皂苷-纳米硒复合物(PLD-NSe~0)对CCl_4引起的小鼠急性肝损伤的预防保护作用。方法:采用CCl_4法制造小鼠急性肝损伤模型,检测正常组,模型组,联苯双酯阳性组和PLD-NSe~0高、中、低剂量组小鼠血清中谷丙转氨酶(ALT)、谷草转氨酶(AST)、碱性磷酸酶(ALP)、球蛋白(GLB)、白蛋白(ALB)、总蛋白(TP)水平以及肝组织匀浆中的谷胱甘肽过氧化物酶(GSH-Px)的活力和丙二醛(MDA)含量。计算小鼠的肝重指数,观察肝脏组织病理学变化。结果:PLD-NSe~0的高、中剂量组与模型组相比,小鼠血清中TP、ALB的含量显著升高,肝组织中的GSH-Px活力(p0.01)显著增强,而小鼠血清中ALT、AST、ALP水平、GLB含量和肝组织中MDA含量显著降低,病理切片显示PLD-NSe~0组均不同程度改善肝组织病理的变化。结论:PLD-NSe~0对CCl_4所致急性肝损伤有保护作用。     

丹龙胶囊活血化瘀作用的实验研究

目的研究丹龙胶囊活血化瘀作用。方法利用肾上腺素加冷刺激造成大鼠急性血瘀模型,观察丹龙胶囊对大鼠血液流变学的影响;利用肾上腺素造成小鼠肠系膜循环障碍,观察丹龙胶囊对小鼠肠系膜微循环的影响。结果丹龙胶囊能降低急性血瘀模型大鼠全血黏度和红细胞聚集指数,缩短红细胞电泳时间;增大肠系膜循环障碍小鼠的肠系膜毛细血管平均管径和流态评分,加快血流速度。结论丹龙胶囊具有活血化瘀作用。     

绿侧花海葵寡肽对CCl_4引起的小鼠急性肝损伤模型的影响

研究绿侧花海葵寡肽(APP-H)对四氯化碳(CCl4)引起的小鼠急性肝损伤模型的影响。48只ICR小鼠随机分成6组,每组8只:正常对照组、肝损伤模型组、绿侧花海葵寡肽AAP-H低剂量组(75 mg·kg-1)、AAP-H中剂量组(150 mg·kg~(-1))、AAP-H高剂量组(300 mg·kg-1)和阳性对照组(联苯双酯(150 mg·kg-1))。连续灌胃7天,正常组与模型组用等计量纯水灌胃。第7天末采用腹腔注射1%CCl_4橄榄油溶液制备小鼠急性肝损伤模型,测定小鼠血清ALT、AST和小鼠肝脏组织匀浆中GSH-Px、SOD、MDA水平,HE染色观察APP-H对小鼠肝脏的病理学影响及微观结构影响。结果表明,AAP-H可降低小鼠血清中ALT、AST活性(P0.05),抑制肝组织中MDA的上升(P0.05),上调SOD和GSH-Px活性(P0.05),使肝细胞的损伤减轻。本实验初步证明APP-H对CCl_4致小鼠急性肝损伤有一定的保护作用。     

蔓菁多糖抗高原缺氧作用研究

为探讨蔓菁多糖对小鼠抗高原缺氧的作用,将小鼠随机分为6组,正常对照组、模型对照组、阳性对照组(诺迪康胶囊)及蔓菁多糖低、中、高剂量组(各组按照0.5、1.0、2.0 g/kg.bw.d剂量灌胃给药),采用低压氧舱模拟高原急性低压缺氧动物模型,观察小鼠海马区脑神经形态,测定小鼠脑组织和血清中丙二醛(MDA)、超氧化物歧化酶(SOD)活性.实验结果显示,蔓菁多糖高剂量组可明显减轻小鼠海马区神经元损伤,降低脑组织和血清中MDA含量(P0.05),提高SOD活性(P0.05).表明蔓菁多糖对小鼠高原急性缺氧脑损伤具有保护作用,这可能与其抗氧化活性有关.     

绞股蓝皂甙对实验性糖尿病小鼠的降糖作用研究

采用小鼠腹腔注射四氧嘧啶建立糖尿病模型,实验分6组:空白对照组、模型对照组、二甲双胍片组、绞股蓝高、中、低剂量组,实验持续4周,测定空腹血糖值、肝糖原值,并观察肾脏的组织切片,探讨绞股蓝皂甙对实验性糖尿病小鼠的降糖作用。结果表明绞股蓝皂甙对糖尿病小鼠有较好降血糖作用,能提高肝糖原的合成,并保护肾脏。     

小花清风藤不同药用部位及溶剂提取物对四氯化碳致小鼠急性损伤的保护作用

观察小花清风藤不同药用部位及溶剂提取物对四氯化碳致小鼠急性损伤的保护作用.取昆明雄性小鼠共168只,随机分为21组,每组8只,即正常组、CCl_4模型组、水飞蓟素组、水提取组低、高剂量组、50%乙醇提取组低、高剂量组、95%乙醇提取组低、高剂量组.正常组灌胃给予等体积的0.5%羧甲基纤维素钠,其余组均按20mL/kg灌胃给予相应的药物,每日1次,连续7d,每天观察实验动物行为及体征,末次给药的次日,取材进行实验.取肝,计算肝脏的称量和质量指数,取肝组织匀浆检测肝组织中ALT、AST和SOD、GSH-Px活性及MDA含量,另取肝组织进行组织形态学分析.结果表明小花清风藤可减轻CCl_4对肝脏的脂质过氧化损伤,降低肝组织中ALT和AST活性,升高肝组织中SOD和GSH-Px水平,降低肝组织中MDA含量,从而减轻CCl_4对肝组织氧化损伤,改善肝脏的组织病理学形态,保护肝细胞并恢复肝功能.在小花清风藤水提取组低、高剂量组,50%乙醇提取组低、高剂量组,95%乙醇提取组中,以SJY作用效果比较好,依次是50%AJY、95%AJY、SJ、50%AJ、95%AJ、SY、50%AY、95%AY,且呈现明显的量效关系.小花清风藤对CCl_4致小鼠急性肝损伤具有显著的保护作用,其作用机制可能与其抗氧化作用有关.     

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.     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

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.