Propagated error analysis of digital elevation models generated by bi-cubic hermite interpolation methods

2013-2014 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Development of the viviparous hypocotyl of mangrove and its adaptation to inter-tidal habitats:A review

作者简介: 闫中正( 1978～) , 男, 河南南阳人, 硕士生, 主要从事红树植物生理生态学研究。E-mail : nytv@ sohu. com 通讯作者Author for correspondence. E-mail: wenqing2001@ hotmail. com[中文文摘]热带亚热带海岸潮间带的高盐、淹水、土壤缺氧和潮水冲击等不良环境因子导致了红树植物在形态、生理和生态方面的特异性 ,尤其是其独特的胎生现象。从红树植物胎生繁殖体在母体的发育过程和繁殖体落地后对潮间带生境的适应两个角度探讨了红树植物胎生现象的适应意义。红树植物的胎生现象是对潮间带盐胁迫、淹水、土壤缺氧和潮水冲击等综合生境的适应 ,而不是单独其中一种胁迫因子的适应。红树植物胎生繁殖体在母体的发育过程中通过能量积累、渗透调节、形态完善等过程为掉落以后适应潮间生境做准备 ,掉落的胎生繁殖体依靠从母体获得的能量和营养克服潮间带的盐胁迫、淹水、土壤缺氧和潮水冲击等多重胁迫。红树植物胎生繁殖体落地后的能量收支平衡是决定繁殖体定居成功与否的关键 ,而胎生现象的意义正是通过胎生繁殖体在母体发育过程中积累足够的能量和营养来适应潮间带生境。红树植物胎生繁殖体落地后苗木在潮间带滩涂的生长发育过程中存在一个能量“阈限”,能阈的高低决定于潮间带生境的恶劣程度 ,而突破能阈能力决定于胎生繁殖体所携带的能量与营养的数量。这为红树林湿地恢复提供了理论基础 ,但还需要更多的证据来支持该理论.[英文文摘]Mangroves are a diverse group of predominantly tropical trees and shrubs growing in the marine intertidal zone where conditions are usually harsh , restrictive and dynamic. The peculiarities of the mangrove intertidal habitat causes the peculiarity of its structure, physiology and ecology . The vivipary of mangroves is one particular feature which is the result of long-term adaptation to the inter-tidal environment. The adaptive significa nce of vivipary to mang rove plants was reviewed from two aspects: propagule development while still attached on the mat ernal plants and adaptation to inter-tidal environments of propagules after release . Vivipary in mangrove plants is an adaptation to the integ rat ed stresses of salt, water logging and tide,but not any single stress. During t he development of vivipar ous propag ules while still attached to maternal plants, they accumulate energy , nutrients and osmotica and perfect their structure, adaptating them to t he intertidal environment after release. The viviparous propagules depend on the energy and nutrients accumulated from maternal plants to cope with salt and waterlogging stresses. The success or not of the ecesis of vivipar ous propagules depends on the balance of energy income and expenditure . The significance of vivipary in mang rove plants is to accumulate enough energy and nutrients to cope with the intertidal environment. A “t hr eshold”hypothesis is put forw ard in this paper . According to this hypothesis, there is a threshold of energy during growth and development of the viviparous propagules in the intertidal environment . The height of the threshold depends on t he degree of environmental stress, such as water salinity, w aterlogging duration and photo synthetic illuminat ion. The ability to climb above the threshold depends on storing sufficient quantity of energy and nutrients in viviparous propagules. This threshold hypothesis calls for more direct evidence .国家自然科学基金资助项目 (3 0 2 0 0 0 3 1

洗涤剂中的十二烷基苯磺酸钠对海洋藻类生长的影响

洗涤剂中的十二烷基苯磺酸钠对海洋藻类生长的影响王宪，李文权，郑爱榕，韩涛生，连卫中（厦门大学海洋学系）关键词lAS，布氏双尾藻，悬浮物前言随着工农业生产的发展，洗涤剂的使用范围越来越广，用量日趋增大。藻类是水生生态系统的初级生产者，通过各种途径进入水...福建省自然科学基

金属纳米结构表面等离激元共振增强光电化学反应

联合多个外场协同相互作用,表面等离激元共振(SPR)效应用于调控表面反应,可以进一步提高反应效率和选择性。在本文中,我们研究了在外加光场的作用下,通过电位对金属电极费米能级的调控,实现对SPR能量的调控,从而调节SPR弛豫产生热电子和热空穴的能量,研究SPR增强化学反应的光电协同机制,调控金属纳米结构(NPs)光电化学界面反应的选择性和效率。国家自然科学基金项目(21533006,21621091)资

INFLUENCE OF SURFACE ROUGHNESS ORIENTATIONS ON FRICTION COEFFICIENT OF WHEEL/RAIL SPECIMEN IN OIL LUBRICATION

黏着力是列车安全与平稳运行的关键因素之一.最大黏着力与摩擦力有关,摩擦力的减小会导致黏着力的降低.表面粗糙度及其取向是影响摩擦系数的重要因素,然而,有关表面粗糙度取向对于混合润滑状态下摩擦系数的影响的研究结论似乎是矛盾的.用激光离散改性技术将车轮试样表面制备成具有菱形、纵纹、横纹3种典型的形貌,并且与不作激光离散改性处理的车轮试样作对比,用基于确定性模型的统一雷诺方程数值分析法和小比例尺度的轮轨试样摩擦学实验,得到的结论是:在油润滑状态下,激光表面形貌大幅提高摩擦系数,其中菱形对应的摩擦系数最大,纵纹与横纹的摩擦系数相差不大,摩擦系数的大小主要取决于由表面粗糙度取向决定的接触区内粗糙峰接触压力与总压力之比,侧流效应也是影响摩擦系数的重要因素,它主要取决于接触区内表面粗糙度的取向

夜间低温对红树幼苗光合特性的影响

以温室栽培秋茄（Ｋａｎｄｅｌｉａｃａｎｄｅｌ）和木榄（Ｂｒｕｇｕｉｅｒａｇｙｍｎｏｒｒｈｉｚａ）幼苗为材料，每日傍晚１９：００至次日８：００进行１３ｈ５℃和１０℃夜间低温处理，白天将材料移至温室．室温恢复１ｈ和４ｈ，分别测定功能叶的净光合速率、气孔导率、蒸腾速率和叶绿素含量．结果表明：夜间低温明显降低秋茄和木榄幼苗的净光合速率，５℃处理抑制程度大于１０℃．白天常温恢复时间增长，净光合速率回升．１０℃处理１～５ｄ，秋茄和木榄幼苗叶净光合速率的抑制程度逐渐下降，其中秋茄幼苗叶的净光合速率恢复能力强于木榄．低温处理过程中，秋茄和木榄叶净光合速率与气孔导率和蒸腾速率均呈线性关系，表明红树叶光合碳获得的减少与叶片水分丢失同时进行，气孔导率是控制光合碳合成和蒸腾水分丢失动态平衡的主要因

Biological characteristics of mesenchymal stem cells from bone marrow versus adipose tissue in rats

背景:除骨髓外,人们已从胎盘组织、脐带血肌肉组织、脂肪组织中分离到了间充质干细胞。目的:比较大鼠脂肪和骨髓间充质干细胞生物学特性和免疫调节功能的差异。方法:脂肪间充质干细胞和骨髓间充质干细胞分别来自bn大鼠的脂肪和骨髓。体外分离、纯化脂肪和骨髓来源间充质干细胞,进行细胞形态、表面标志、生长动力学、分化潜能鉴定;混合淋巴细胞反应比较两种细胞的免疫调节特性。结果与结论:脂肪间充质干细胞与骨髓间充质干细胞光镜和透射电镜下形态相似,第3代的脂肪间充质干细胞和骨髓间充质干细胞均高表达Cd29,Cd90,低表达Cd34,Cd45,Cd11b;第3,4,5代脂肪间充质干细胞增殖速度明显快于骨髓间充质干细胞;两者都具有低免疫原性,可以抑制异基因抗原引起的T淋巴细胞增殖,且这种抑制作用与细胞数目成正相关,等量脂肪间充质干细胞和骨髓间充质干细胞抑制作用差异无显著性意义。结果证实脂肪间充质干细胞具有和骨髓间充质干细胞同样的低免疫原性和免疫调节功能。BACKGROUND:Except bone marrow,people have collected mesenchymal stem cells (MSCs) from placenta tissue,cord blood muscle tissue and adipose tissue.OBJECTIVE:To compare the difference in biological characteristics and immunoloregulation of rat adipose-derived MSCs (ADSCs) and bone marrow MSCs (BMSCs).METHODS:ADSCs and BMSCs were obtained respectively from adipose and bone marrow of BN rats.ADSCs and BMSCs were isolated and purified in vitro to determine cell morphology,surface marker,growth kinetics and differentiation potential.Immunoloregulation of ADSCs and BMSCs was compared in mixed lymphocyte response RESULTS AND CONCLUSION:Morphology was similar between ADSCs and BMSCs under an optical microscope and transmission electron microscope.ADSCs and BMSCs at passage 3 highly expressed CD29 and CD90,weakly expressed CD34,CD45 and CD11b.The proliferation speed of ADSCs at passages 3,4 and 5 was obviously faster than BMSCs.Both ADSCs and BMSCs possessed low immunogenicity,could suppress allogenic antigen-induced T lymphocyte proliferation.Moreover,this inhibitory effect was positively associated with cell number.There were no significant differences in inhibitory effects of an equal volume of ADSCs and BMSCs.Results verified that ADSCs had the same low immunogenicity and immunoloregulation as BMSCs.卫生部科学研究基金——福建省卫生教育联合攻关计划资助(WKJ2005-2-020);厦门市科技计划社会发展项目(3502Z20064020)资助课题名称:外周血干细胞移植诱导肝移植术后免疫耐受的实验研究---

人脂肪间充质干细胞的分离培养及其鉴定

背景:人脂肪间充质干细胞在不同的条件下被成功诱导分化为成骨细胞、软骨细胞、骨骼肌细胞、肝脏细胞等中胚层细胞,同时也可以向其他胚层分化,证明脂肪间充质干细胞是多分化潜能干细胞。目的:探讨人脂肪间充质干细胞的分离、鉴定方法。方法:整形外科吸脂术获得腹部皮下脂肪,0.075%Ⅰ型胶原酶消化,贴壁培养获得人脂肪间充质干细胞,绘制细胞增殖曲线,进行流式细胞、细胞周期、免疫荧光等检测,并验证其是否具有多功能分化潜能。结果与结论:获得形态较均一的长梭形的人脂肪间充质干细胞,细胞增殖良好,有明显的指数生长期,体外能长期培养存活,并保持不分化状态;流式检测细胞高表达CD105、CD90,低表达CD34、CD45;多数细胞周期检测G0/G1期占80%以上。能向成脂、成骨诱导分化。结果表明,实验分离获得的细胞是具有脂肪间充质干细胞特性的细胞,为深入研究人脂肪间充质干细胞打下基础

Luminescence of Strain Compensated Si/Si_(0.62)Ge_(0.38) Quantum Well Grown on Si_(0.75)Ge_(0.25) Virtual Substrate

由于SI/SIgE异质结构的带阶差主要发生在价带,为实现高效率的发光,本文从理论上设计了在硅基SI1-XgEX虚衬底上外延应变补偿的SI/S1-ygEy(y>X)量子阱的能带结构,将量子阱对电子的限制势垒提高到100MEV以上。在实验上,采用300℃生长的gE量子点插入层,制备出薄的SIgE驰豫缓冲层(虚衬底),表面gE组份达到0.25,表面粗糙度小于2nM,驰豫度接近100%。在我们制备的SIgE缓冲层上外延了应变补偿SIgE/SI多量子阱结构,并初步研究了其发光特性。In this paper,band structures of strain compensated Si/S_(1-y)Ge_y(y>x) quantum well grown on Si_(1-x)Ge_x virtual substrate was design to enlarge the conduction band offset up to 100meV for improving luminescence.The fully strain-relaxed Si_(0.75)Ge_(0.25) virtual substrate was prepared by inserting a low-temperature Ge islands layer in ultra-high vacuum chemical deposition.The root-mean-square surface roughness of the virtual substrate is less than 2nm.The luminescence of the strain compensated Si/SiGe quantum well on the virtual substrate was investigated.国家重点基础研究发展计划资助项目2007CB613400;国家自然科学基金资助项目(60676027;50672079