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Habitat specialization and phylogenetic structure of tree species in a coastal Brazilian white-sand forest

j.urnal of Plant Ecology 2014年第2期7卷 134-144页

作者： Alexandre A.de Oliveira Alberto Vicentini j.rome Chave Camila de T.Castanho stuart j.Davies Adriana M.Z.Martini Renato A.F.Lima Ricardo R.Ribeiro Amaia Iribar Vinicius C.Souza Instituto de Biociências Universidade de São PauloRua do Matão321Travessa 14São PauloSP 0550890Brazil Instituto Nacional de Pesquisas da Amazônia Av.AndréAraújo2936CP 478.ManausAM 69060001Brazil Evolution et DiversitéBiologique Bâtiment 4R1 UniversitéPaul Sabatier118 route de Narbonne31062 ToulouseFrance Smithsonian Tropical Research Institute PO Box 37012WashingtonDC 20013-7012USA ESALQ Universidade de São Paulo.Avenida Pádua Dias11PiracicabaSP 13418900Brazil

Aims The coastal Brazilian rainforest on white-sand(restinga)ranks among the most fragmented forest types in the tropics,owing to both the patchy distribution of sandy soils and widespread coastal development *** we study the environmental and evolutionary determinants of a forest tree assemblage at a single restinga forest in Southeastern *** also explore the ability of competing hypotheses to explain the maintenance of species diversity in this forest type,which includes contrasting extremes of edaphic conditions associated with flooding *** The study was conducted in a white-sand forest permanent plot of 10.24 ha on the coastal plain of Southeastern *** plot was divided into 256 quadrats of 20×20 m,which were classified into two main edaphic habitats(flooded and drained).Trees with a diameter≥1 cm at breast height were *** assembled DNA sequence data for each of the 116 morphospecies recognized using two chloroplast markers(rbcL and matK).A phylogenetic tree was obtained using the maximum likelihood method,and a phylogenetic distance matrix was produced from an ultrametric *** analyzed similarity in floristic composition and structure between habitats and related them to cross-plot distances using permutation *** model torus shift simulations were performed to obtain a statistical significance level for habitat association for each *** phylogenetic structure for the two habitats and for each 20×20 m quadrat was calculated using the mean phylogenetic distance weighted by species abundance and checked for significance using the standardized effect size generated by 5000 randomizations of phylogenetic tip *** Findings Our results indicate that partitioning among edaphic habitats is important for explaining species distributions and coexistence in restinga *** distributions within the plot were found to be non-random:there was greater floristic similarity within than betwe

关键词： habitat association torus-translation test phylogenetic community structure niche partitioning edaphic condition

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Plasma-polymerized pericyte patches improve healing of murine wounds through increased angiogenesis and reduced inflammation

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Regenerative Biomaterials 2021年第4期8卷 21-32页

作者： Hannah M.Thomas Parinaz Ahangar Robert Fitridge Giles T.S.Kirby stuart j.Mills Allison j.Cowin Future Industries Institute University of South AustraliaMawson Lakes SA 5095Australia Cell Therapy Manufacturing Cooperative Research Centre Adelaide SA 5000Australia Faculty of Health and Medical Sciences University of AdelaideAdelaide SA 5005Australia

Pericytes have the potential to be developed as a cell therapy for the treatment of wounds;however,the efficacy of any cell therapy relies on the successful delivery of intact and functioning ***,the effect of delivering pericytes on wound repair was assessed alongside the development of a surface-functionalized pericyte *** polymerization(PP)was used to functionalize the surface of silicone patches with heptylamine(HA)or acrylic acid(AA)*** pericytes were subsequently delivered to murine excisional wounds by intradermal inj.ction or using the pericyte-laden patches and the comparative effects on wound healing,inflammation and revascularization *** AA surface provided the superior transfer of the cells to de-epidermized *** murine wounds treated either with pericytes inj.cted directly into the wound or with the pericyte-laden AA patches showed improved healing with decreased neutrophil infiltration and reduced numbers of macrophages in the *** delivery also enhanced angiogenesis through a mechanism independent of VEGF ***,when delivered to wounds,improved healing responses by dampening inflammation and promoting *** of pericytes using PP-AA-functionalized patches was equally as effective as direct inj.ction of pericytes into ***-functionalized dressings may therefore be a clinically relevant approach for the treatment of wounds.

关键词： pericytes cell therapy wound healing plasma polymerization advanced surfaces

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Dynamic optoelectric trapping and deposition of multiwalled carbon nanotubes

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Microsystems & Nanoengineering 2016年第1期2卷 264-269页

作者： Avanish Mishra Katherine Clayton Vanessa Velasco stuart j.Williams Steven T.Wereley Birck Nanotechnology Center School of Mechanical EngineeringPurdue UniversityWest LafayetteIN 47907USA Department of Mechanical Engineering University of LouisvilleKY 40292USA

In the path toward the realization of carbon nanotube(CNT)-driven electronics and sensors,the ability to precisely position CNTs at well-defined locations remains a significant *** complex CNT-based bottom–up structures can be synthesized if there is a method to accurately trap and place these *** this study,we demonstrate that the rapid electrokinetic patterning(REP)technique can accomplish these *** using laser-induced alternating current(AC)electrothermal flow and particle–electrode forces,REP can collect and maneuver a wide range of vertically aligned multiwalled CNTs(from a single nanotube to over 100 nanotubes)on an electrode *** addition,these trapped nanotubes can be electrophoretically deposited at any desired location onto the electrode *** from active control of the position of these deposited nanotubes,the number of CNTs in a REP trap can also be dynamically tuned by changing the AC frequency or by adj.sting the concentration of the dispersed *** the basis of a calculation of the stiffness of the REP trap,we found an upper limit of the manipulation speed,beyond which CNTs fall out of the REP *** peak manipulation speed is found to be dependent on the electrothermal flow velocity,which can be varied by changing the strength of the AC electric field.

关键词： carbon nanotube deposition optoelectrical tweezers patterning trapping

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陆桥岛屿生境中繁殖鸟类群落的周转率研究

陆桥岛屿生境中繁殖鸟类群落的周转率研究

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第十二届全国鸟类学术研讨会暨第十届海峡两岸鸟类学术研讨会

作者：斯幸峰 stuart L.Pimm Gareth j.Russell 丁平濒危动植物保护生物学教育部重点实验室浙江大学生命科学学院 Nicholas School of the Environment Box 90328Duke UniversityDurhamNC 27708U.S.A. Department of Biological Sciences New Jersey Institute of TechnologyNewarkNJ 07102U.S.A.

MacArthur-Wilson岛屿生物地理学理论认为岛屿隔离度决定物种迁入率,岛屿面积决定局部种群的灭绝率。其他理论同时指出面积可以影响迁入率,隔离度亦能影响灭绝率,而且这些关系还可能会占主导作用。本研究在2007年至2012年对千岛湖37个... 详细信息

MacArthur-Wilson岛屿生物地理学理论认为岛屿隔离度决定物种迁入率,岛屿面积决定局部种群的灭绝率。其他理论同时指出面积可以影响迁入率,隔离度亦能影响灭绝率,而且这些关系还可能会占主导作用。本研究在2007年至2012年对千岛湖37个岛屿开展了繁殖鸟类调查,并运用多重变量逻辑斯谛回归模型估计每个岛屿的物种迁入率和灭绝率,并分析了迁入率和灭绝率,以及物种周转率(turnover)和发生率(incidence)与岛屿面积和隔离度的关系。分析结果表明:(1)灭绝率随着岛屿面积的增大而减小;(2)迁入率随着距大陆

关键词：生物地理学生境片段化路桥岛屿千岛湖周转率

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雌、雄草原田鼠外周骨骼肌肌球蛋白重链的表达(英文)

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动物学报 2008年第1期54卷 104-110页

作者： Andrew C. FRY Michael H. FERKIN Brian K. SCHILLING stuart T. LEONARD Matthew P. HARBER Martyn R. RUBIN j. Chadwick SMITH Department of Health Sport & Exercise Sciences The University of Kansas Lawrence KS 66045 USA Department of Biology The University of Memphis Memphis TN 38152 USA Department of Health and Sport Sciences The University of Memphis Memphis TN 38152 USA

已往的研究对于实验室应用的各种啮齿类动物,如大鼠和小鼠骨骼肌蛋白表达的特性已有报道。然而,至今不清楚其它啮齿类动物如野生鼠骨骼肌蛋白的表达或性双态性的特征,而这些野生鼠的行为学、形态学及生理学特点均已有报道。已知骨骼肌... 详细信息

已往的研究对于实验室应用的各种啮齿类动物,如大鼠和小鼠骨骼肌蛋白表达的特性已有报道。然而,至今不清楚其它啮齿类动物如野生鼠骨骼肌蛋白的表达或性双态性的特征,而这些野生鼠的行为学、形态学及生理学特点均已有报道。已知骨骼肌的肌球蛋白重链( MHC)成分与其功能特性有关。我们研究了草原田鼠的肱三头肌、胫骨前肌、腓肠肌和比目鱼肌MHC蛋白表达的性别特性。应用SDS聚丙烯酰胺凝胶电泳法测定MHCⅠ型、Ⅱa型、Ⅱd/x和Ⅱb型的蛋白表达相对含量。结果表明:与雌鼠相比,雄鼠的比目鱼肌湿重较大,胫骨前肌的MHCⅡa蛋白量表达较高。未见骨骼肌重量及MHC蛋白表达含量在雌雄鼠间的性别差异。血中睾酮的浓度差异可能不影响外周骨骼肌蛋白的表达特性。然而,与过去在大鼠、兔和小鼠中的已报道的结果相比,草原田鼠骨骼肌MHC的表达显示了更多异质性。推测这可能与草原田鼠和其它小型哺乳类动物生存的自然环境和功能需要有关。

关键词：性二态性骨骼肌蛋白同分异构性别

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