6 research outputs found

    Sodium/calcium exchanger inhibitor SN-6 rescued heart dysfunction and cell death in calcium paradox

    Get PDF
    目的评价钠-钙交换体选择性抑制剂Sn-6对钙矛盾处理造成离体灌注大鼠心脏功能障碍和心肌细胞死亡的影响。方法离体心脏先后经历3 MIn无钙液、30 MIn有钙液灌注即钙矛盾处理,实验同步监测左室功能,并检测复钙期冠脉流出液乳酸脱氢酶(ldH)含量与实验结束时存活心肌组织面积的大小。结果钙矛盾处理使得左室功能丧失,表现为左室舒张末压(lVEdP)显著抬高,左心室发展压(lVdP)、心室压力变化最大速率(±dP/dT)为0;心脏几乎不存在活性组织;于无钙液灌注前2 MIn、无钙液灌注期和复钙后前5 MIn给予10μMOl/l Sn-6处理后,lVEdP显著降低,lVdP和±dP/dT明显恢复,心肌损伤面积缩小,ldH释放减少;Sn-6处理的对照心脏于灌流结束时左室功能没有显著改变。结论 Sn-6具有减轻钙矛盾处理造成的心功能损害,增加细胞存活的作用,提示钠-钙交换体是钙矛盾损伤的关键分子。Objective The present study was to observe the effect of sodium /calcium exchanger inhibitor SN-6 on heart dysfunction and cell death induced by calcium paradox.Methods Calcium paradox in isolated heart was elicited by 3-min calcium depletion followed by 30-min calcium repletion in the absence or presence of 10 μmol/L SN-6,an inhibitor of sodium/calcium exchanger.Cardiac function was monitored,and lactate dehydrogenase(LDH) release during calcium repletion and infarct size was measured.Results Upon calcium repletion,the heart deteriorated,exhibiting a marked depression in cardiac function,an enlarged infarct size and an increase in LDH release.These changes were significantly attenuated by SN-6.SN-6 had no effect on cardiac performance at the end of perfusion under control conditions.Conclusion The results demonstrate that SN-6 rescues heart dysfunction and cell death in calcium paradox.It also indicates that sodium/calcium exchanger is a key molecule in the injury.国家自然科学基金(30971196

    长期玉米连作下黑土各组分有机质化学结构特征

    No full text
    【目的】研究玉米连作24年前后黑土有机质红外光谱特征,探明长期玉米连作对黑土各团聚体及密度组分中有机质结构的影响,完善长期连作下土壤有机质化学结构动态变化理论。【方法】以中国科学院海伦农业生态试验站长期定位试验为研究平台,选取24年玉米连作下耕层(0—20 cm)土壤为研究对象,以试验设置前土样为对照,根据团聚体和密度大小,将土壤有机质进行分级,分别用元素分析仪和傅里叶红外光谱仪测定原土、各粒级团聚体及密度组分中的碳含量和有机质的红外光谱,对比分析玉米连作24年前后土壤有机质含量及红外光谱特征。【结果】玉米连作24年后,全土中碳含量降低5.3%,2—0.25 mm团聚体中碳含量显著降低,其他粒级团聚体中有降低的趋势;LF(游离态轻组)中碳含量增加32.74%,OF(闭蓄态轻组)中减少16.72%,MF(矿质结合态组分)中没有显著变化。土壤有机质中脂肪族-CH、多糖C-O、酚醇-OH吸收峰相对强度增强,芳香族C=C和羧基C=O吸收峰相对强度降低,脂肪族-CH/芳香族C=C比值增加。在各粒级团聚体中,-CH/C=C比值增加主要表现在>2 mm团聚体中,主成分分析也表明>2 mm团聚体中有机质结构变化最大,该粒级团聚体中3个密度组分LF、OF和MF有机质-CH/C=C比值增加,且LF中增加程度最大;在其他粒级中的3个密度组分有机质-CH/C=C比值有增加的趋势。【结论】长期玉米连作,黑土大粒级团聚体和各密度组分中有机质结构趋于脂肪化、简单化,团聚体和矿物质结合对有机质的保护作用降低,黑土有机质稳定性下降

    Characteristics of polychlorinated biphenyls( PCBs) in atmospheric particulate matters in northwestern Taiwan Strait during winter and spring

    No full text
    2006年1~4月在台湾海峡西岸东北部的平潭岛上空采集了大气颗粒物样品,分析样品中的多氯联苯(PCbS)、类二噁英类多氯联苯(dl-PCbS)等浓度及组成,研究了海岛大气的污染特征及其可能来源.结果表明:平潭岛大气颗粒物中PCbS的质量浓度为0.223~21.658 Pg/M3,平均值为4.820 Pg/M3.28个PCbS同系物单体中以PCb138和PCb189为主.颗粒物中PCbS的组成以六氯取代和七氯取代的高氯取代为主,平均约占总浓度的44.5%和32.2%.11个dl-PCbS的毒性当量范围为0.008~215.576 fg/M3,其中对毒性当量贡献较大的为PCb126、PCb123和PCb189.CPCbS-27和Cdl-PCbS-11均呈现出冬季1、2月浓度相对较高,春季3、4月较低的趋势.气团后向轨迹分析表明,平潭岛地区冬春季大气颗粒物中PCbS可能来源于北方城市地区的供暖和工业排放.Atmospheric particulate matter samples were collected at Pingtan Island over the western Taiwan Strait region from January to April,2006.Polychlorinated biphenyls( PCBs) of the samples were analyzed by Gas chromatography-Electron capture detector( GC-ECD),and then the concentrations,compositions,possible sources of PCBs and dioxin-like polychlorinated biphenyls( DL-PCBs) were studied.Results showed that the mass concentrations of PCBs in the Pingtan Island aerosol samples varied from 0.223 pg / m3 to 21.658 pg / m3,with an average of4.820 pg / m3.PCB138 and PCB189 were the major homolog monomers of the 28 analyzed PCBs' homolog monomers.Higher molecular weight PCB congeners were dominated and the average ratios of concentrations for hexaand hepta-CBs to the total PCBs concentrations were 44.5% and 32.2% respectively.The toxic equivalent quantities( TEQ) of 11 DL-PCBs were in the range of 0.008 ~ 215.576 fg / m3,while PCB126,PCB 123 and PCB 189 were the dominant contributors to the TEQ.Concentrations of CPCBs-27 and CDL-PCBs-11 were higher in winter( January and February),while a little lower in spring( March and April).Backward air mass trajectory analysis suggested that heating and industrial emissions of northern urban areas in China may contribute some PCBs pollution to Pingtan Island in winter and spring.国家海洋局海洋-大气化学与全球变化重点实验室开放基金资助项目(GCMAC1108); 国家社会公益专项资助项目(2004DIB5J178); 国家自然科学基金资助项目(41305133); 福建省自然科学基金资助项目(2013J05065); 国家海洋局第三海洋研究所基本科研业务费资助项目(海三科2009054

    植物模式标本的考证与数字化:以中国国家植物标本馆为例

    No full text
    模式标本是最重要的植物标本,是确定植物学名的依据,是植物分类学家从事植物系统分类研究必不可少的科学材料,也是开展专科专属研究、编写国家或地方植物志、进行植物区系调查研究、开发利用和保护植物资源的重要基本资料。但模式标本的人为和自然毁损难以避免,模式标本及其标签信息的数字化使得模式标本的形态、地理分布、采集等主要信息得到最大限度的永久保存,可以极大地方便模式标本信息的共享,可以为科学研究人员或相关人员提供植物形态、地理分布、历史变迁等多方面的信息。本文以中国科学院植物研究所国家植物标本馆维管束植物模式标本数字化建设为例,详细介绍了规范化整理模式标本的方法、模式标本数字化的操作流程,并通过大量实例介绍了模式标本考订的过程、常见问题的处理方法等,以期为其他单位开展模式标本数字化建设提供经验
    corecore