采用Ⅶ型胶原酶构建大鼠脑出血模型

目的:利用Ⅶ型胶原酶构建大鼠脑出血模型,为脑出血研究寻找理想的造模方法.方法:使用健康雄性200~250 g Wistar大鼠,采用立体定位注射的方法向大鼠脑内尾状核部位缓慢注入含0.6 U胶原酶Ⅶ的溶液1 L,术后观察大鼠行为学改变,于术后3d和7d分别取材观察血肿形成情况.结果:术后24h大鼠即有明显行为学改变,3 d可以形成直径3 mm左右的血肿,至7 d血肿区神经细胞大量坏死.结论:Ⅶ型胶原酶定位注射可以建立理想稳定的脑出血动物模型.     

大鼠皮层运动中枢出血模型的制备

目的研究大鼠皮层运动中枢出血模型制备的可行性.方法立体定位下向皮层运动中枢区注入自体动脉血,连续观察术后10 d内模型的肢体运动情况及组织形态学变化.结果所有实验动物均成活,单肢瘫痪明显,组织形态学改变显著.结论立体定向术回输自体动脉血于皮层运动中枢制成的模型成活率高,症状明显,操作方便.     

尾状核、豆状核的三维重建可视化研究

目的探讨基于立体定向空间利用尸脑资料重建尾状核、豆状核的可行性,为临床立体定向手术靶点定位提供基础资料.方法选取1例成年男性尸脑做全脑轴位剖切,层厚为2 mm,对每一层面进行顺序拍照并保存,而后对尾状核、豆状核进行识别、分割、提取与重建.结果重建后尾状核、豆状核的空间位置及形态在标准立体定向空间中被清晰地显示出来.结论利用尸脑资料重建尾状核、豆状核,可以实现其三维可视化.     

经外侧裂小骨窗开颅术与立体定向术治疗高血压脑出血的临床研究

目的：探讨经外侧裂小骨窗开颅血肿清除术（简称小骨窗）与立体定向血肿抽吸术（简称立体定向）治疗高血压脑出血的疗效．方法：分别对80例高血压脑出血患者分别采用经外侧裂小骨窗开颅血肿清除术及立体定向血肿抽吸术治疗．结果：小骨窗组与立体定向组血肿抽吸术患者术后偏瘫开始恢复时间分别为（12±3．2）天、（18±4．5）天,两组比较有显著性差异（P〈0．05）;术后肺部感染和上消化道出血的发生没有明显差别（P〉0．05）;预后（Ac-tivity of daily living,ADL）小骨窗组优于立体定向组（P〈0．05）．结论：与立体定向血肿抽吸术相比,经外侧裂小骨窗开颅血肿清除术能够有效清除血肿,是治疗高血压脑出血的理想方法．     

常规饲料添加蛋黄和花生米的方法建立大鼠肥胖模型

目的通过常规饲料添加蛋黄和花生米的方法诱发建立雄性SD营养性肥胖大鼠动物模型。方法 30只4周龄SD雄性大鼠随机分为实验组24只,对照组6只。实验组饲喂正常饲料并添加鸡蛋黄及花生米,饲喂2周后实验组剔除肥胖抵抗大鼠,对照组饲喂正常饲料。大鼠饲喂8周后称量大鼠体质量并计算Lee's指数,禁食12 h后处死,腹主动脉取血分离血清,检测血清中总胆固醇(TC)、甘油三脂(TG)含量,同时取肝脏组织进行组织病理学检查。结果实验组大鼠饲喂8周后,体质量达到526.6±46.4 g,对照组大鼠体质量为415.6±33.7 g,实验组大鼠体质量超过对照组体质量26.7%;实验组的Lee's指数为330.0±8.2,对照组Lee's指数为307.0±6.6(P0.01),实验组与对照组比较有极显著差异。实验组的大鼠的血清TG均值为2.16±0.17 mmol/L、TC均值为1.40±0.34 mmol/L,对照组血清TG均值为1.66±0.11 mmol/L,TC均值为0.82±0.13 mmol/L,两组大鼠比较有极显著性差异。病理学结果显示:实验组大鼠肝脏均出现脂肪样变。结论 4周龄SD雄性大鼠采用正常饲料并添加鸡蛋黄及花生米的方法能稳定成功地建立营养性肥胖大鼠模型。     

核桃仁提取物对AD模型大鼠海马和皮质区ChAT、AchE活性的影响

目的：观察核桃仁提取物对阿尔兹海默病(Alzheimer′s disease，AD)模型大鼠中枢胆碱能系统活性的影响，进而探讨核桃仁提取物对AD的防治作用.方法：采用双侧Meynert核立体定向注射微量Aβ1-40制造AD大鼠模型，分别使用核桃仁的3种提取物灌胃干预后，检测大鼠海马与皮质区胆碱乙酰转移酶(ChAT)、乙...     

三七总皂苷对脑出血大鼠神经细胞凋亡及相关基因的影响

目的:研究三七总皂苷对脑出血大鼠神经细胞凋亡及相关基因的影响.方法:将大鼠随机分为假手术组、模型组和三七总皂苷组,利用胶原酶注射尾状核法制作脑出血模型,利用免疫组化染色法及细胞凋亡染色法检测各组大鼠Bcl-2、Bax、Caspase-3及TUNEL阳性细胞数目.结果:在6 h、2 d、3 d、5 d、7 d共5个时间点,模型组、三七总皂苷组大鼠神经细胞凋亡情况、Bcl-2、Bax、Caspase-3与假手术组相比差异均显著,具有统计学意义(P0.05);三七总皂苷组大鼠神经细胞凋亡情况、Bcl-2、Bax、Caspase-3与模型组相比差异均显著,具有统计学意义(P0.05).结论:三七总皂苷治疗可以显著下调Bax、Caspase-3的表达水平,提高Bcl-2的表达水平,减少神经细胞凋亡,降低脑出血后继发性损伤.     

腹外侧视前区微量注射组胺对大鼠睡眠-觉醒周期的影响

目的 研究组胺作用于腹外侧视前区对大鼠睡眠-觉醒周期的影响。方法 通过脑立体定位、腹外侧视前区微量注射组胺,脑电图仪记录及分析睡眠、觉醒时相。结果 微量注射50μmol/L组胺无明显影响,而100μmol/L组胺显著减少大鼠睡眠,增加觉醒。结论 组胺在腹外侧视前区对大鼠睡眠-觉醒周期发挥重要的调节作用,具有明显的促觉醒作用。     

米非司酮对晚孕大鼠肾超微结构的影响

目的 :探讨米非司酮对晚孕大鼠肾超微结构的影响。方法 :将妊娠 2 0dWistar大鼠 10只 ,随机分实验组与对照组 ,每组各 5只 ,灌胃法饲予实验组米非司酮 (11 5± 1 0 )mg /只 ,对照组每只给予食用麻油 1mL ,分娩后处死大鼠 ,取右侧肾脏作电镜观察。结果 :与对照组相比 ,实验组肾小体无明显改变 ,大部分肾小管上皮正常 ,局部肾小管上皮细胞出现胞质水肿 ,线粒体肿胀 ,嵴断裂 ,肾间质水肿增宽 ,间质细胞肿胀 ,甚至出现胞膜破裂、染色质边聚、核浓缩等坏死性改变。结论 :单剂量米非司酮用于晚孕引产可造成大鼠肾组织损伤。     

运动结合红景天素对糖尿病大鼠血糖等指标的影响

观察运动结合狭叶红景天素对糖尿病大鼠血糖等指标的影响.四氧嘧啶诱导的糖尿病大鼠20只,随机分为实验组(10只)和对照组(10只),称取甘肃地产狭叶红景天200 g,60%乙醇浸泡后萃取得红景天素,每隔3 d给实验组大鼠尾静脉注射1次红景天素,同时实验组大鼠进行30 d连续跑台运动,第32 d断头取血,测每只大鼠血糖、转氨酶、尿素氮和血常规指标.结果表明,运动结合红景天素对糖尿病大鼠的BUN,MCV,MCH,MCHC无显著性影响(P0.05);但与对照组相比,ABG,GPT,RBC,HCT,HGB,RDW,PLT,WBC却发生了显著性变化.说明运动结合红景天素可以显著改善糖尿病大鼠血糖等诸多血液指标.     

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.