间歇低氧暴露对运动性低血红蛋白大鼠血液抗氧化能力的影响

将43只Sprague-Dawly(SD)大鼠随机分为安静对照组、运动对照组、运动低氧暴露低氧2 h组和运动低氧暴露(1+1)h组.运动各组分别进行为期6周递增负荷跑台运动训练,低氧暴露组从第4周起各在运动后进行人工低氧(O_2体积分数为145 mL/L)暴露2 h和(1+1)h.实验结束后测试大鼠红细胞参数与血清丙二醛、血清谷胱甘肽过氧化物酶和血清超氧化物歧化酶含量.6周运动训练后,运动性低血红蛋白现象发生,常氧运动组大鼠血清谷胱甘肽过氧化物酶和血清超氧化物歧化酶显著或非常显著低于常氧安静组,而间歇低氧暴露各组大鼠未见显著下降的现象,其中运动低氧暴露(1+1)h组抗氧化酶水平最高,血清丙二醛含量呈现相反的变化.结果显示,间歇低氧能较为有效地预防运动性低血红蛋白大鼠抗氧化能力的下降,以多次反复的低氧刺激方式效果较佳,其作用机理可能与间歇低氧暴露能提高机体酶性抗氧化系统水平有关.     

间歇低氧预防SD大鼠递增负荷训练期抗氧化能力下降及其机制的探讨

将53只SD大鼠随机分为常氧安静组(A组)和常氧运动组(B组)、运动低氧暴露1h组(C组)、运动低氧暴露2h组(D组)和运动低氧暴露(1+1)h组(E组).运动各组进行6周递增负荷跑台运动,低氧暴露各组从第4周起分别在运动后进行人工常压低氧(14.5%O2)暴露1h、2h和(1+1)h.实验结束后测试血清超氧化物歧化酶(SOD)、血清谷胱甘肽过氧化物酶(GSH-PX)、血清过氧化氢酶(CAT)、血清总抗氧化能力(T-AOC)、血清丙二醛(MDA)含量.结果显示:6周递增负荷运动后,常氧运动组大鼠SOD、GSH-PX、CAT和T-AOC显著或非常显著低于常氧安静组,而运动低氧暴露各组大鼠各项指标未出现显著下降的现象;血清MDA水平却呈现相反的变化.以上结果表明,间歇低氧暴露能有效地预防大鼠递增负荷训练期间大鼠机体抗氧化能力降低的发生与发展,其作用机理可能与间歇低氧暴露能提高机体抗氧化酶系统水平相关.     

杜仲提取物抗运动疲劳作用的实验研究

目的探讨杜仲提取物对大鼠激素水平、物质代谢及运动能力的影响。方法 SD大鼠随机分为安静对照组、力竭运动组、力竭运动加药组(服用杜仲提取物)。7周力竭运动后取材测定血清胰岛素、胰高血糖素、生长激素、血糖、肝糖原、肌糖原、乳酸血尿素和血红蛋白等生物化学指标。结果①与安静对照组比较:力竭运动组大鼠胰岛素和生长激素水平显著低于安静对照组,(P<0.05或P<0.01),胰高血糖素水平显著高于安静对照组(P<0.05);肝糖原、肌糖原含量及血糖浓度显著低于安静对照组,且均有极显著性差异(P<0.01);血乳酸浓度和肌乳酸含量均显著高于安静对照组(P<0.01),BU浓度极显著高于安静对照组(P<0.01),Hb含量显著低于安静对照组(P<0.05);跑台运动至力竭时间显著长于安静对照组(P<0.05)。②与力竭运动组比较:力竭运动加药组大鼠胰岛素和生长激素水平均极显著高于力竭运动组(P<0.01),胰高血糖素水平显著高于力竭运动组(P<0.05);肝糖原含量及血糖浓度极显著高于力竭运动组(P<0.01),肌糖原含量显著高于力竭运动组(P<0.05);血乳酸和肌乳酸浓度极显著低于力竭运动组(P<0.01);BU浓度极显著高于力竭运动组(P<0.01),Hb含量极显著低于力竭运动组(P<0.01);大鼠跑台运动力竭时间有显著的延缓作用(P<0.05)。结论杜仲提取物可提高力竭运动大鼠激素水平,改善物质代谢,延长运动时间,增强运动能力。     

补充女贞子提取物对运动训练大鼠不同组织抗氧化水平及运动能力的影响

通过女贞子提取物对运动训练大鼠不同组织抗氧化酶水平和运动能力的影响,探讨女贞子提取物对大鼠运动能力的作用机制.结果显示:6周后安静对照组在安静时、运动对照组和运动女贞子组进行一次力竭性运动后取材,测定不同组织总抗氧化能力(T-AOC)、总超氧化物歧化酶活性(T-SOD)、过氧化氢酶(CAT)等抗氧化酶活性和丙二醛(MDA)含量.运动女贞子组大鼠不同组织T-AOC、T-SOD、CAT活性与运动对照组比较均有显著升高(P<0.05);运动女贞子组大鼠不同组织MDA含量与运动对照组比较均有显著降低(P<0.05).运动女贞子组大鼠运动至力竭时间比运动对照组延长23.09%.表明补充女贞子提取物可以调节大鼠不同组织中抗氧化酶活性,减少MDA的生成,延长运动至疲劳的时间.     

我国末次盛冰期古气候环境时空演化特征初探

为了探讨黄芪多糖(APS)对力竭运动大鼠机体的保护作用,通过建立大强度力竭运动大鼠模型,选取成年健康雄性SD大鼠24只,随机分为安静对照组,运动组和运动加药组,运动组和运动加药组按照训练模型进行为期6周的耐力训练,最后1次训练进行1次力竭运动,随后取心肌组织并进行样本处理.检测大鼠心肌MDA含量,用缺口末端标记法(TUNEL法)及免疫组织化学法检大鼠心肌细胞凋亡指数(AI)及BcL-2、Bax蛋白表达的变化.结果表明:运动组MDA含量、AI和BcL-2、Bax蛋白表达水平均明显高于安静对照组(P<0.05);与运动组比较,运动加药组MDA含量,AI与Bax蛋白表达水平均下降,而BcL-2蛋白表达水平显著增高(P<0.05).黄芪多糖可有效抑制力竭运动大鼠心肌细胞凋亡,此作用可能与其减轻氧化应激、上调BcL-2和下调Bax蛋白表达水平有关.     

补充L-肉碱对运动大鼠骨骼肌能量生成变化的影响

目的:本研究通过对SD大鼠外源性补充左旋肉碱(L-肉碱)并结合长期游泳训练,观察大鼠骨骼肌肉碱含量、骨骼肌线粒体肉碱脂酰转移酶-I、H+K+-ATP酶活性的变化,分析运动及补充L-肉碱对机体骨骼肌能量消耗与生成变化的影响,为进一步探讨外源性L-肉碱对机体能量代谢影响的作用机制及其应用提供实验依据。方法:健康雄性同龄纯种SD大鼠32只,所有大鼠在适应性饲养一周后,随机分成安静对照组(A组)、单纯运动组(E组),单纯补充L-肉碱组(L组),运动结合补充L-肉碱组(LE),分笼喂养,每组8只。安静对照组和单纯补充L-肉碱组不进行任何运动,单纯运动组和运动结合补充L-肉碱组进行游泳训练,训练时间共持续6周。补充L-肉碱组和训练结合补充L-肉碱组每周训练三次,并于每次游泳训练前1小时补充L-肉碱,安静对照组及单纯训练组自由进食,经6周实验后各组大鼠取出骨骼肌样本分别采用紫外分光光度计,ELISA测定并分析各组大鼠骨骼肌组织线粒体H+K+-ATP酶、CPT-I酶活性变化。结果:与安静对照组相比,单纯运动组大鼠骨骼肌线粒体H+K+-ATP酶、CPT-I酶活性差异无统计学意义(P>0.05);单纯补充L-肉碱组大鼠H+K+-ATP酶、CPT-I酶活性升高,但差异无统计学意义(P>0.05);运动结合补充L-肉碱组大鼠H+K+-ATP酶、CPT-I酶活性的升高具有统计学意义(P<0.05)。与单纯运动组相比,运动结合补充L-肉碱大鼠H+K+-ATP酶、CPT-I酶活性显著升高,并具有统计学意义(P<0.01)。结论:(1)在安静及单纯补充L-肉碱条件下,大鼠运动结合补充L-肉碱后骨骼肌中肉碱含量显著增高,有利于脂酰CoA进入线粒体的速度增加,脂肪酸氧化速度因此加快,ATP能量的生成可较大程度提高。(2)与安静状态下大鼠相比,运动并结合补充L-肉碱后骨骼肌线粒体中H+K+-ATP酶的活性显著升高,且比单纯运动后升高更为显著,提示运动结合补充L-肉碱对骨骼肌线粒体H+K+-ATP酶活性产生的增高效应会进一步促进骨骼肌线粒体的能量代谢。     

间歇低氧暴露对逐步递增负荷运动大鼠白细胞及其分类计数的影响

低氧训练是体育训练项目中广泛采用并行之有效的运动训练方法和手段.在低氧训练的过程中,机体处于低氧环境和运动的双重刺激下,对外周血中的免疫细胞参数有明显的影响.本文将探讨间歇低氧刺激对逐步递增负荷运动大鼠白细胞的影响.将大鼠随机分为安静组、运动组、运动+低氧连续暴露组和运动+间歇低氧暴露组.后3组进行6周递增负荷跑台运动,运动+低氧连续暴露组和运动+间歇低氧暴露组从第4周起各在运动后进行人工低氧(O_2含量为14.5%)2 h连续暴露和间隔3 h的暴露.6周训练后,运动组大鼠运动性低血红蛋白现象发生,运动组、运动+低氧连续暴露组和运动+间歇低氧暴露组白细胞计数显著或非常显著低于对照组(P0.05或P0.01),间歇低氧暴露对大鼠白细胞总数影响不大(P0.05).运动组大鼠中性粒细胞、淋巴细胞数显著或非常显著低于安静对照组(P0.05或P0.01),运动+间歇低氧暴露组单核细胞数显著低于安静对照组,嗜酸性粒细胞、嗜碱性粒细胞计数四组间无显著性差异(P0.05).提示反复少量的低氧刺激可有效防治运动性低血红蛋白,但对机体免疫力的影响也较大.     

不同运动训练强度对大鼠胃肠道神经递质的影响

目的探讨不同强度运动对大鼠胃肠道神经递质的影响。方法选取成年雄性SD大鼠48只,随机分成3组,即安静对照组、低强度运动组、高强度运动组。各组给予8周不同强度的运动后,测定各组大鼠胃排空率、肠推进率、胃窦组织和十二指肠组织AChE、NOS阳性面积率。结果低强度运动组的胃排空率、肠推进率、胃窦组织和十二指肠组织AChE与安静对照组比较有显著性升高趋势(P<0.05),NOS与安静对照组比较无显著性差异;高强度运动组胃排空率、肠推进率、胃窦组织和十二指肠组织AChE和NOS与安静对照组比较显著性降低(P<0.05),与低强度运动组相比明显下降(P<0.05)。结论低强度运动使大鼠胃排空和肠推进增强,高强度运动对使大鼠胃排空和肠推进有抑制作用,ACh和NO神经递质在其中发挥着重要作用。     

整肤疗法对运动性疲劳大鼠下丘脑单胺类神经递质的影响

[目的]观察整肤疗法对运动性疲劳大鼠下丘脑单胺类神经递质的影响,以探索整肤疗法对中枢神经系统的作用机制.[方法]将40只SD雄性大鼠随即分成安静对照组、运动后即刻处死组、运动后自然恢复组及运动后整肤治疗组.除安静组外,其余组游泳运动至疲劳,即刻组立即处死取下丘脑,自然恢复组休息30min,整肤疗法组施以整肤治疗(提拉皮肤刺激)30min,两组均断头处死取出下丘脑,采用高效液相色谱一电化学检测法检测各组大鼠下丘脑中5-羟色胺(5-HT)和多巴胺(DA)水平.[结果]大鼠运动性疲劳后,下丘脑中的5-HT水平明显升高,DA水平则较明显降低;经过整肤治疗后,5-HT和DA水平虽然变化不明显,但是5-HT水平比自然恢复组低,DA水平已经比运动后即刻略有回升.[结论]整肤疗法在短时间内对运动性疲劳大鼠下丘脑中5-HT和DA水平的影响不明显,但能看出有促进疲劳恢复的趋势.     

肝脏Sirt4在耐力运动改善大鼠胰岛素抵抗中的作用机制

本文探讨了肝脏线粒体沉默信息调节因子4(Silent Information Regulator Protein 4, Sirt4)及其底物谷氨酸脱氢酶（Glutamate Dehydrogenase, GDH）和胰岛素降解酶（Insulin Degrading Enzyme, IDE）在耐力运动改善大鼠胰岛素抵抗中的作用机制。将40只大鼠随机分为对照组和胰岛素抵抗（IR）模型组，5周造模成功后，将IR模型组大鼠随机分为IR安静组（IR）和IR运动组（IRe），对照组大鼠随机分为安静对照组（N）和运动对照组（Ne），对Ne组和IRe组大鼠进行6周转轮运动干预，并对各组大鼠实验前后血脂水平、血清胰岛素（FINS）水平以及Sirt4、GDH和IDE的蛋白表达量进行检测。结果显示，6周耐力运动可显著降低正常大鼠和模型大鼠的体重和FINS值（P<0.05,P<0.01），并显著增加了IR模型大鼠的葡萄糖输送速率达1.53倍（P<0.05）;6周耐力运动显著降低了IR模型大鼠肝脏Sirt4和IDE蛋白表达（P<0.05）、非常显著增加了GDH蛋白表达（P<0.01）...     

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.     

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…     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

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