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Recruitment in species-rich grasslands: the effects of functional traits and propagule pressure

Journal of Plant Ecology 2012年第3期5卷 260-269页

作者： MathiasÖster ove eriksson Department of Botany Stockholm UniversitySE-10691 StockholmSweden

Aims The assembly of plant communities is a complex process which combines impacts from the species pool,dispersal and propagule pressure,niche requirements of colonizing species and the niche structure of the *** theory development has incorporated all these aspects,***‘stochastic niche theory’.We investigated recruitment into a species-rich grassland community,using an experimental approach where we manipulated the trait composition of the community and examined the success of colonizing species entering with various propagule ***,we examined two predictions:(i)colonization success increases with increasing difference between traits of the colonizing species and the trait profile of the community and(ii)colonization success increases with increasing propagule *** The examined communities were species-rich semi-natural grasslands located in southern *** a careful documentation of the composition of the plant communities at the experimental sites,we manipulated the trait profile of species-rich grassland plots based on the plant functional trait specific leaf area(SLA),which is correlated with several key life history *** addition to SLA,seed mass was also used to describe the trait profile of grassland *** of 12 plant species from the regional species pool,varying in SLA and seed mass,were sown into plots using four different levels of propagule *** was examined after 1 *** also planted juvenile‘plug plants’of the same species which allowed us to examine survivorship and growth beyond the seedling *** Findings overall we found very limited evidence for relationships between the traits of the colonizing species and the trait profile of the community and for recruitment after sowing these relationships were contrary to the *** of plug plants after two seasons of growth was high irrespective of the trait profile of the community,but growth of plug

关键词： assembly rules recruitment limitation seed size semi-natural grassland SLA

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Trait-based filtering from the regional species pool into local grassland communities

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Journal of Plant Ecology 2014年第4期7卷 347-355页

作者： Bryndís Marteinsdóttir ove eriksson Department of Ecology Environment and Plant SciencesStockholm UniversityStockholm SE-10691Sweden

Aims For plants to establish in a local community from a pool of possible colonizers from the region,it must pass through a series of *** of the filters is most important in this process has been much *** this study,we explored how species are filtered from the regional species pool into local *** aim was to determine if differences in species abundance and functional traits could explain which species from the regional species pool estab-lish at the local scale and if the filtering differed between grassland *** this study took place in a cultivated landscape in southeastern *** estimated plant species abundance in 12 ex-arable field sites and 8 adjacent seminatural grassland sites and in a 100-m radius around the center of each *** used monte Carlo simula-tions to examine if species abundance and functional traits(height,seed mass,clonal abilities,specific leaf area and dispersal method)controlled the filtering of species from the regional pool into local *** Findingson average,only 28%of species found in the regional pool established in the ex-arable field sites and 45%in the seminatural grassland sites,indicating that the size of the regional species pool was not limiting local *** both grassland types,species abundance in the regional pool was positively correlated with species occurrence at the local *** found evidence for both species interaction filtering and dispersal limitation influencing the local *** local and regional processes were thus influencing the filtering of species from the regional species pool into local *** addition,the age of the communities influenced species filtering,indicating that community assembly and the importance of different filters in that process change over succession.

关键词： assembly rules community assembly dispersal limitation environmental filtering functional traits limiting similarity

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Role of brain serotonin in modulating fish behavior

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Current Zoology 2016年第3期62卷 317-323页

作者： Svante WINBERG Per-ove THORNQVIST Department of Neuroscience Comparative Behavioral Neuroendocrinology Lab Uppsala University Box 593 75124 Uppsala Sweden

The organization of the brain serotonergic system appears to have been highly conserved across the vertebrate subphylum. In fish as well as in other vertebrates, brain serotonin （5-HT）, mainly acts as a neuromodulator with complex effects on multiple functions. It is becoming increasingly clear that acute and chronic increase in brain 5-HT neurotransmission have very different effects. An acute 5-HT activation, which is seen in both winners and losers of agonistic interactions, could be related to a general arousal effect, whereas the chronic activation observed in subordinate fish is clearly linked to the behavioral inhibition displayed by these individuals. Fish displaying diver- gent stress coping styles （proactive vs. reactive） differ in 5-HT functions. In teleost fish, brain monoaminergic function is also related to life history traits.

关键词： aggression dominance monoamines plasticity stress zebrafish.

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Advancing Nitinol: From heat treatment to surface functionalization for nickel-titanium (NiTi) instruments in endodontics

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Bioactive Materials 2023年第4期22卷 91-111页

作者： Wai-Sze Chan Karan Gulati ove APeters The University of Queensland School of DentistryHerstonQLD4006Australia

Nickel-titanium(NiTi)alloy has been extensively researched in endodontics,particularly in cleaning and shaping the root canal *** advances have primarily focused on the design,shape,and geometry of the NiTi files as well as metallurgy and mechanical *** far,extensive investigations have been made surrounding surface and thermomechanical treatments,however,limited work has been done in the realm of surface functionalization to augment its performance in *** review summarizes the unique characteristics,current use,and latest developments in thermomechanically treated NiTi endodontic *** discusses recent improvements in nano-engineering and the possibility of customizing the NiTi file surface for added *** clinical translation of this technology has yet to be fully realized,future research direction will lie in the use of nanotechnology.

关键词： Nitinol Endodontics Nickel Titanium Nanostructures

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Psychological and physiological impacts of a fast-track diagnostic workup for men with suspected prostate cancer:Preliminary report from a randomized clinical trial

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Cancer Communications 2020年第5期40卷 239-242页

作者： Jianwei Zhu Ruoqing Chen Sabina Davidsson Jessica Carlsson Anna Messing-eriksson Jonna Fridfeldt ove Andrén Sven-Olof Andersson Unnur Valdimarsdóttir Fang Fang Katja Fall Department of Orthopedic Surgery West China HospitalWest China Medical SchoolSichuan UniversityChengduSichuan 610000P.R.China Department of Medical Epidemiology and Biostatistics Karolinska InstitutetStockholm 17177Sweden Clinical Epidemiology and Biostatistics School of Medical SciencesÖrebro UniversityÖrebro 70185Sweden Department of Urology Faculty of Medicine and HealthÖrebro UniversityÖrebro 70185Sweden Department of Epidemiology Harvard T.H.Chan School of Public HealthBostonMassachusetts 02115SA Institute of Environmental Medicine Karolinska InstitutetStockholm 17177Sweden

Dear Editor,The increasing number of men who undergo workup for suspected prostate cancer are subject to severe emotional stress[1].Stress levels seem to be elevated as soon as a suspicion of cancer is raised and the waiting time before a final diagnosis may be equally stressful as the post-diagnostic period[1,2].We recently demonstrated a marked increase in risk for different psychiatric disorders during the six months before prostate cancer diagnosis,highlighting the potential impact of emotional stress experienced while waiting for the diagnosis[3].

关键词： diagnosis elevated emotional

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Behavioral Evidence for Cognitive Dysfunctions in the(BALB/cByJ-Kv1.1mceph/mceph)Mouse Model for Epilepsy

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Journal of Behavioral and Brain Science 2011年第4期1卷 210-228页

作者： Sarah Holst Elin Aberg Therese M.eriksson Catharina Lavebratt Sven ove Ogren Department of Neuroscience Karolinska InstituteStockholmSweden Department of Molecular Medicine and Surgery Karolinska University HospitalStockholmSweden Center of Molecular Medicine Department of Physiology and PharmacologyKarolinska InstituteStockholmSweden Department of Clinical Neuroscience Karolinska InstituteStockholmSweden

The epileptic mouse model BALB/cByJ-Kv1.1mceph/mceph (mceph/mceph) is homozygous for a spontaneous mutation truncating the Shaker-like voltage gated potassium channel, Kv1.1 (Kcna1). The mceph/mceph mice are asymptomatic at birth, but develop from 3 weeks of age epileptic seizures, overgrowth and neuronal hyperplasia of the hippocampus. Hippocampal cognitive function of the mice was examined by investigating emotional memory using the aversive Passive Avoidance (PA) task combined with studies of explorative behavior using the non-aversive Novel Cage test (NCT). The behavioural results were examined by multivariate analysis. Compared to wild type and heterozygous mice, the mceph/mceph mice displayed lower exploratory and safety assessment behavior in the NCT and impairment in PA retention 24 hours after training, indicating an impairment in cognitive functions. In conclusion, the epileptic mouse model BALB/cByJ-Kv1.1mceph/mceph, with chronic epilepsy related to potassium-channelopathy, display a behavioural phenotype characterized by impairments in emotional memory and defensive motivational responses probably related to hippocampal dysfunctions.

关键词： Epilepsy Potassium Ion-Channelopathy Hippocampus Passive Avoidance Novel Cage Test Principal Component Analysis

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岩石物理力学性质对断裂附近地应力场的影响

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岩石力学与工程学报 2003年第3期22卷 370-377页

作者：苏生瑞朱合华王士天 Stephansson ove 同济大学地下建筑与工程系长安大学地质工程系西安710054 成都理工大学环境与土木工程学院瑞典皇家工学院

应用离散元方法模拟研究了断裂两侧岩石的物理力学性质(包括岩石内摩擦角、弹性模量、泊松比、粘聚力等)对其附近地应力场的影响。这些因素对断裂附近的地应力场均有不同程度的影响,它们的改变均能使主应力方位和量值发生变化。而且,岩... 详细信息

应用离散元方法模拟研究了断裂两侧岩石的物理力学性质(包括岩石内摩擦角、弹性模量、泊松比、粘聚力等)对其附近地应力场的影响。这些因素对断裂附近的地应力场均有不同程度的影响,它们的改变均能使主应力方位和量值发生变化。而且,岩石物理力学性质的影响与断裂力学性质、边界条件等的影响是互相联系的。分别研究了单一断裂和复合断裂模型,在复合断裂模型中,断裂两侧岩石的弹性模量对应力变化的影响最大。

关键词：岩石力学地应力场断裂地应力场离散单元法数值模拟

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Virtual Classroom in the Cloud Transnational Scandinavian Teaching With Digital Technology

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Journal of Literature and Art Studies 2013年第10期3卷 669-676页

作者： ove Christensen University College Zealand Roskilde Denmark

In the Scandinavian countries： Sweden, Norway and Denmark, the project GNU （Gr^enseoverskridende Nordisk Undervisning, i.e. Transnational Nordic Teaching） is experimenting with ways of conducting teaching across the borders in the elementary schools. The cloud classes are organised with one class from each country in the subjects： language, science, math, social science/history. The teachers from the three classes work together to design teaching they conduct together with assignments the students will be able to solve only in collaboration with their fellow students in the three classes. The three year project ends in 2014 but already now there are some interesting findings on how transnational teaching collaboration works for teachers and students. This paper will focus on the different uses of web based tools of synchronous and asynchronous communication and discuss challenges and benefits in regard to learning and pedagogy with virtual classroom.

关键词： online learning cloud teaching pedagogy digital literacy digital didactics

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An Anatomy of the Concept of Time in Maynard Keynes

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Economics World 2017年第2期5卷 146-153页

作者： Mogens ove Madsen Aalborg University Aalborg Denmark

One of the most striking changes in economic, thinking which comes primarily with John Maynard Keynes, is his explicit focus on time. For example, it appears early in a part of Keynes＇s writings that prediction is a very difficult matter. Due to the near impossibility of prediction of the future, uncertainty is a central theme relatively early of Keynes＇s economic thinking. This theme regarding prediction also implies that Keynes makes a clear distinction between short- and long-term expectations. Theory was to be concerned mainly with the present and with short period situations and the explicit attention to the concept of time, and subsequent alternative method of analysis has led to a number of innovations in economic thinking. This paper will address Keynes＇s handling of the concept of time from three angles： studying his philosophical background, his understanding of society, and his development of economic theory.

关键词： time uncertainty prediction money A-series B-series

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晚期艾滋病患者的微循环障碍

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中华医学杂志 1991年第1期71卷 18-20页

作者：修瑞娟 ove,B 100730，北京，中国医学科学院微循环研究所 00730，北京，中国医学科学院微循环研究所瑞典斯德哥尔摩罗斯兰斯特尔医院

利用显微闭路电视系统对11例艾滋病患者及11名健康成人进行了甲皱微循环对照观察,发现艾滋病患者的甲皱微循环具有独特而严重的障碍:(1)自主交替性毛细血管血流灌注功能严重失调,(2)毛细血管管壁内皮细胞严重损伤。这些发现证明微循环... 详细信息

利用显微闭路电视系统对11例艾滋病患者及11名健康成人进行了甲皱微循环对照观察,发现艾滋病患者的甲皱微循环具有独特而严重的障碍:(1)自主交替性毛细血管血流灌注功能严重失调,(2)毛细血管管壁内皮细胞严重损伤。这些发现证明微循环障碍在艾滋病发病机制中占有重要的地位,同时也说明微循环与机体免疫状态有密切关系。

关键词：艾滋病微循环

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