目的探讨Algisyl可植入性水凝胶在心力衰竭中的运用及注意事项。方法回顾性分析2015年4月浙江大学医学院附属第二医院心脏中心开展2例Algisyl可植入性水凝胶治疗心力衰竭的手术过程与患者预后情况，并对术前评估、术中操作以及患者术后...目的探讨Algisyl可植入性水凝胶在心力衰竭中的运用及注意事项。方法回顾性分析2015年4月浙江大学医学院附属第二医院心脏中心开展2例Algisyl可植入性水凝胶治疗心力衰竭的手术过程与患者预后情况，并对术前评估、术中操作以及患者术后情况进行总结。结果2例患者严格进行术前评估；术中行全身麻醉、气管插管；由心脏大血管外科医生实施左侧肋间切口，暴露心脏；确认患者的左心室中间水平为注射部位，每个注射点注射0．3 mL Algisyl，注射点间距1．5cm左右（总注射针数取决于患者心脏大小，一般14-19点）。术中患者未发现持续性室速、室颤等恶性心律失常现象，无心脏骤停、过敏、栓塞等不良事件。术后患者胸闷气急等症状明显缓解，恢复良好，顺利出院。手术首次采用斜行进针和实时超声监控的方法，避免Agisyl进入血液，提高手术的安全性。结论Algisyl可植入性水凝胶在心力衰竭中的运用是安全可行的，患者的远期预后还有待进一步观察。展开更多
The as-extruded Mg？Sn？Ca alloys were prepared and investigated for orthopedic applications via using optical microscopy, scanning electron microscopy, X-ray diffraction, as well as tensile, immersion and electrochem...The as-extruded Mg？Sn？Ca alloys were prepared and investigated for orthopedic applications via using optical microscopy, scanning electron microscopy, X-ray diffraction, as well as tensile, immersion and electrochemical tests. The results showed that, with the addition of 1% Sn and the Ca content of 0.2%？0.5%, the microstructure of the as-extruded Mg？Sn？Ca alloys became homogenous, which led to increased mechanical properties and improved corrosion resistance. Further increase of Ca content up to 1.5% improved the strength, but deteriorated the ductility and corrosion resistance. For the alloy containing 0.5% Ca, when the Sn content increased from 1% to 3%, the ultimate tensile strength increased with a decreased corrosion resistance, and the lowest yield strength and ductility appeared with the Sn content of 2%. These behaviors were determined by Sn/Ca mass ratio. The analyses showed that as-extruded Mg？1Sn？0.5Ca alloy was promising as a biodegradable orthopedic implant.展开更多
Because co-occurring native and invasive plants are subjected to similar environmental selection pressures,the differences in functional traits and reproductive allocation strategies between native and invasive plants...Because co-occurring native and invasive plants are subjected to similar environmental selection pressures,the differences in functional traits and reproductive allocation strategies between native and invasive plants may be closely related to the success of the latter.Accordingly,this study examines differences in functional traits and reproductive allocation strategies between native and invasive plants in Eastern China.Plant height,branch number,reproductive branch number,the belowground-to-aboveground biomass ratio,and the reproductive allocation coefficient of invasive plants were all notably higher than those of native species.Additionally,the specific leaf area(SLA)values of invasive plants were remarkably lower than those of native species.Plasticity indexes of SLA,maximum branch angle,and branch number of invasive plants were each notably lower than those of native species.The reproductive allocation coefficient was positively correlated with reproductive branch number and the belowground-to-aboveground biomass ratio but exhibited negative correlations with SLA and aboveground biomass.Plant height,branch number,reproductive branch number,the belowground-to-aboveground biomass ratio,and the reproductive allocation coefficient of invasive plants may strongly influence the success of their invasions.展开更多
Aims Successful plant invaders usually exhibit three strategies:Jack-of-all-trades(more robust in stressful sites),Master-of-some(more responsive in favorable sites)and Jack-and-master(both robustness and responsivene...Aims Successful plant invaders usually exhibit three strategies:Jack-of-all-trades(more robust in stressful sites),Master-of-some(more responsive in favorable sites)and Jack-and-master(both robustness and responsiveness).To revisit these strategies,we examined how soil inorganic nitrogen(N)compositions and levels influence the success of native and invasive plant congeners in the context of plant communities.Methods We conducted an experiment involving three fixed factors:species origin,N composition and N level.Here,we selected 21 plant species(eight pairs of invasive and native congeners and five non-congeneric natives)to assemble plant communities,which were subject to nine N environments consisting of three N compositions(3:1,2:2 and 1:3 NO3−/NH4+)and three N levels(low,medium and high N).We determined the following metrics:total biomass,relative biomass(a proxy of species success),mortality rate and mortality time.Important Findings Across nine N environments,native and invasive congeners exhibited similar total biomass,relative biomass and mortality time,but invaders had a marginally lower mortality rate than natives.Similar success between native and invasive congeners was linked to their similar growth and tolerance.N compositions influenced mortality time and N levels affected the total biomass and relative biomass.Importantly,species origin,N composition and N level interactively affected the total biomass,relative biomass and mortality time.These findings suggest that native and invasive plant congeners may be similarly successful across different N environments,and that inorganic N compositions and levels both contribute to plant invasion success.展开更多
文摘目的探讨植入型心室辅助装置稳定性、主体血泵溶血性能及可植入性。方法首先,辅助装置在常温下连续驱动蒸馏水30 d,观察血泵转速、驱动电流等变化情况,测试其稳定性。同时,在流量5 L/min左右,出入口压差为100 mmHg情况下,心室辅助装置通过体外模拟循环实验台驱动羊血完成溶血性能测试,最后计算出血泵标准溶血指数(normal index of hematolysis,NIH)。最后,将心室辅助装置模拟主体血泵植入实验动物体内,对比术前及术后胸片,检验植入血泵对实验动物心室及周围器官的影响,验证其植入性能。结果辅助装置常温下连续驱动蒸馏水30 d,无卡泵和渗漏现象发生;血泵溶血性能良好,NIH值为(0.008±0.002)g/100 L;血泵可以很容易的植入心腔,植入血泵对实验动物心脏及周围器官无挤压变形。结论实验结果证明植入型心室辅助装置具有良好的稳定性、溶血性能以及可植入性。
文摘目的探讨Algisyl可植入性水凝胶在心力衰竭中的运用及注意事项。方法回顾性分析2015年4月浙江大学医学院附属第二医院心脏中心开展2例Algisyl可植入性水凝胶治疗心力衰竭的手术过程与患者预后情况，并对术前评估、术中操作以及患者术后情况进行总结。结果2例患者严格进行术前评估；术中行全身麻醉、气管插管；由心脏大血管外科医生实施左侧肋间切口，暴露心脏；确认患者的左心室中间水平为注射部位，每个注射点注射0．3 mL Algisyl，注射点间距1．5cm左右（总注射针数取决于患者心脏大小，一般14-19点）。术中患者未发现持续性室速、室颤等恶性心律失常现象，无心脏骤停、过敏、栓塞等不良事件。术后患者胸闷气急等症状明显缓解，恢复良好，顺利出院。手术首次采用斜行进针和实时超声监控的方法，避免Agisyl进入血液，提高手术的安全性。结论Algisyl可植入性水凝胶在心力衰竭中的运用是安全可行的，患者的远期预后还有待进一步观察。
基金Project(2013CB632200)supported by the National Basic Research Program of ChinaProjects(51474043,51531002)supported by the National Natural Science Foundation of China+1 种基金Projects(CSTC2013JCYJC60001,KJZH14101)supported by Chongqing Municipal Government,ChinaProject(2015M581350)supported by the China Postdoctoral Science Foundation
文摘The as-extruded Mg？Sn？Ca alloys were prepared and investigated for orthopedic applications via using optical microscopy, scanning electron microscopy, X-ray diffraction, as well as tensile, immersion and electrochemical tests. The results showed that, with the addition of 1% Sn and the Ca content of 0.2%？0.5%, the microstructure of the as-extruded Mg？Sn？Ca alloys became homogenous, which led to increased mechanical properties and improved corrosion resistance. Further increase of Ca content up to 1.5% improved the strength, but deteriorated the ductility and corrosion resistance. For the alloy containing 0.5% Ca, when the Sn content increased from 1% to 3%, the ultimate tensile strength increased with a decreased corrosion resistance, and the lowest yield strength and ductility appeared with the Sn content of 2%. These behaviors were determined by Sn/Ca mass ratio. The analyses showed that as-extruded Mg？1Sn？0.5Ca alloy was promising as a biodegradable orthopedic implant.
基金Project(31300343)supported by the National Natural Science Foundation of ChinaProject supported by Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment,ChinaProject(12JDG086)supported by Research Foundation for Advanced Talents of Jiangsu University,China
文摘Because co-occurring native and invasive plants are subjected to similar environmental selection pressures,the differences in functional traits and reproductive allocation strategies between native and invasive plants may be closely related to the success of the latter.Accordingly,this study examines differences in functional traits and reproductive allocation strategies between native and invasive plants in Eastern China.Plant height,branch number,reproductive branch number,the belowground-to-aboveground biomass ratio,and the reproductive allocation coefficient of invasive plants were all notably higher than those of native species.Additionally,the specific leaf area(SLA)values of invasive plants were remarkably lower than those of native species.Plasticity indexes of SLA,maximum branch angle,and branch number of invasive plants were each notably lower than those of native species.The reproductive allocation coefficient was positively correlated with reproductive branch number and the belowground-to-aboveground biomass ratio but exhibited negative correlations with SLA and aboveground biomass.Plant height,branch number,reproductive branch number,the belowground-to-aboveground biomass ratio,and the reproductive allocation coefficient of invasive plants may strongly influence the success of their invasions.
基金by Ministry of Science and Technology of the People's Republic of China(2017YFC1200102)the National Natural Science Foundation of China(31971552).
文摘Aims Successful plant invaders usually exhibit three strategies:Jack-of-all-trades(more robust in stressful sites),Master-of-some(more responsive in favorable sites)and Jack-and-master(both robustness and responsiveness).To revisit these strategies,we examined how soil inorganic nitrogen(N)compositions and levels influence the success of native and invasive plant congeners in the context of plant communities.Methods We conducted an experiment involving three fixed factors:species origin,N composition and N level.Here,we selected 21 plant species(eight pairs of invasive and native congeners and five non-congeneric natives)to assemble plant communities,which were subject to nine N environments consisting of three N compositions(3:1,2:2 and 1:3 NO3−/NH4+)and three N levels(low,medium and high N).We determined the following metrics:total biomass,relative biomass(a proxy of species success),mortality rate and mortality time.Important Findings Across nine N environments,native and invasive congeners exhibited similar total biomass,relative biomass and mortality time,but invaders had a marginally lower mortality rate than natives.Similar success between native and invasive congeners was linked to their similar growth and tolerance.N compositions influenced mortality time and N levels affected the total biomass and relative biomass.Importantly,species origin,N composition and N level interactively affected the total biomass,relative biomass and mortality time.These findings suggest that native and invasive plant congeners may be similarly successful across different N environments,and that inorganic N compositions and levels both contribute to plant invasion success.
