检索结果-南通市图书馆

Leaf/shoot level ecophysiology in two broadleaf and two needle-leaf species under representative cloud regimes at alpine treeline

引用

Journal of Plant Ecology 2016年第6期9卷 762-772页

作者： Adriana Sanchez Nicole M.Hughes william k.smith Programa de Biología Universidad del RosarioCarrera 24 No.63C-69BogotáDC 110011Colombia Department of Biology Wake Forest University136 Winston HallWinston-SalemNC 27106USA Department of Biology High Point UniversityUniversity Station 3591High PointNC 27262USA

Aims The effects of clouds are now recognized as critically important to the understanding of climate change impacts on ***,few studies have focused specifically on the ecophysiological responses of plants to *** continental mountain ranges are characterized by common convective cloud formation in the afternoons,yet little is known regarding this influence on plant water and carbon *** we compare the ecophysiology of two contrasting,yet ubiquitous growth forms,needle-leaf and broadleaf,under representative cloud regimes of the Snowy Range,Medicine Bow Mountains,southeastern Wyoming,*** Photosynthetic gas exchange,water use efficiency,xylem water potentials and micrometeorological data were measured on representative clear,overcast and partly cloudy days during the summers of 2012 and 2013 for two indigenous broadleaf(Caltha leptosepala and Arnica parryi)and two needle-leaf species(Picea engelmannii and Abies lasiocarpa)that co-occur *** Findings Reductions in sunlight with cloud cover resulted in more dramatic declines in photosynthesis for the two broadleaf species(ca.50-70%reduction)versus the two conifers(no significant difference).In addition,the presence of clouds corresponded with lower leaf conductance,transpiration and plant water status in all ***,the more constant photosynthesis in conifers under all cloud conditions,coupled with reduced transpiration,resulted in greater water use efficiency(ca.25%higher)than the broadleaf *** differences appear to implicate the potential importance of natural cloud patterns in the adaptive ecophysiology of these two contrasting,but common,plant growth forms.

关键词： gas exchange light response curves water use efficiency xylem water potential

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

高山植物麻花艽不同生态因子导致的花闭合

高山植物麻花艽不同生态因子导致的花闭合

引用

中国植物学会七十周年年会

作者：何亚平刘建全段元文 william k.smith 中国科学院西北高原生物研究所青藏高原生物进化与适应开放实验室韦克林业大学生物学系

在被子植物中,传粉及其它原因诱导的花闭合是一类很少见的花形态变化现象。总结前人对不同类群的研究结果,我们定义了两类花闭合:暂时性闭合和永久性闭合,前者可重复地发生在不良天气状况和夜间,受温度诱导;而后者发生在传粉后,一旦闭...

在被子植物中,传粉及其它原因诱导的花闭合是一类很少见的花形态变化现象。总结前人对不同类群的研究结果,我们定义了两类花闭合:暂时性闭合和永久性闭合,前者可重复地发生在不良天气状况和夜间,受温度诱导;而后者发生在传粉后,一旦闭合再不开放。但这些作者都只是单独地在欧洲和北美的龙胆属植物中研究了两种花闭合现象之一及其发生原因。

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Neuroprotection by resveratrol-glucuronide and quercetin-glucuronide via binding to polyphenol-and glycosaminoglycan-binding sites in the laminin receptor

引用

Neural Regeneration Research 2025年第3期20卷 819-820页

作者： Rayudu Gopalakrishna Jennifer Aguilar Emily Lee william J.Mack Department of Integrative Anatomical Sciences Keck School of MedicineUniversity of Southern CaliforniaLos AngelesCAUSA Department of Neurological Surgery Keck School of MedicineUniversity of Southern CaliforniaLos AngelesCAUSA

The dietary polyphenolic compounds resveratrol and quercetin prevent neurodegenerative diseases in experimental models;however, they reach the brain only in nanomolar concentrations in the glucuronidated and sulfated ... 详细信息

关键词： resveratrol molar dated

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The evolving ENSO observing system

引用

National Science Review 2018年第6期5卷 805-807页

作者： Dake Chen Neville smith william kessler State key Laboratory of Satellite Ocean Environment Dynamics Second Institute of Oceanography

El Nio–Southern Oscillation (ENSO)is by far the most energetic and influential short-term climate variability on our planet, originating from an instability of the large-scale ocean-atmosphere interaction in the tr... 详细信息

关键词： The evolving ENSO observing system TAO

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Emerging role of A-kinase anchoring protein 5 signaling in reward circuit function

引用

Neural Regeneration Research 2025年第10期20卷 2913-2914页

作者： william J.Flerlage Mark L.Dell’Acqua Brian M.Cox Fereshteh S.Nugent Uniformed Services University of the Health Sciences Department of Pharmacology and Molecular TherapeuticsBethesdaMDUSA Department of Pharmacology University of Colorado School of MedicineAnschutz Medical CampusAuroraCOUSA

There is a strong evidence supporting the hypothesis of synaptic dysfunction as a major contributor to neural circuit and network disruption underlying emotional and mood dysregulation in psychiatric disorders(Simmons et al.,2024).Diverse sets of distinct molecular signaling pathways converge on the synapse to regulate synaptogenesis,synaptic function,and synaptic plasticity in brain regions and circuits through complex interactions organized by numerous multivalent protein scaffolds,including the family of proteins known as A-kinase anchoring proteins(AkAPs).

关键词： function supporting

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Aerosol-Monsoon Climate System of Asia:A New Paradigm

引用

Journal of Meteorological Research 2016年第1期30卷 1-11页

作者： william k.M.Lau Earth Science Interdisciplinary Center University of MarylandCollege Park

This commentary is based on a series of recent lectures on aerosol-monsoon interactions I gave at the Beijing Normal University in August 2015. A main theme of the lectures is on a new paradigm of ＂An Aerosol-Monsoon-Climate-System＂, which posits that aerosol, like rainfall, cloud, and wind, is an integral component of the monsoon climate system, influencing monsoon weather and climate on M1 timescales. Here, salient issues discussed in my lectures and my personal perspective regarding interactions between atmospheric dynamics and aerosols from both natural and anthropogenic sources are summarized. My hope is that under this new paradigm, we can break down traditional disciplinary barriers, advance a deeper understanding of weather and climate in monsoon regions, as well as entrain a new generation of geoscientists to strive for a sustainable future for one of the most complex and challenging human-natural climate sub-system of the earth.

关键词： aerosol monsoon climate system interaction new paradigm

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

First episode psychosis with extrapyramidal signs prior to antipsychotic drug treatment

引用

Chinese Science Bulletin 2011年第32期56卷 3361-3371页

作者： HONER william G LANG Donna J kOPALA Lili C MACEWAN G william smith Geoffrey N CHEN Eric Y H CHAN Raymond C k Department of Psychiatry University of British Columbia Vancouver BC Canada Department of Radiology University of British Columbia Vancouver BC Canada Department of Psychiatry Dalhousie University Halifax NS Canada Department of Psychiatry University of Hong Kong key Laboratory of Mental Health Institute of Psychology Chinese Academy of Sciences

Extrapyramidal movement disorders are common in chronic schizophrenia, and may be an intrinsic feature of the illness as well as related to antipsychotic drug treatment. Similar dysfunctions at illness onset may have implications for outcome, and for under- standing the mechanisms of illness. The objectives were to examine the clinical correlates of pre-treatment movement disorders at first episode of psychosis, and determine associations with neuropsychological function and striatal structure. Never medicated subjects were recruited from consecutive admissions to Early Psychosis Programs with defined catchment areas in Hong kong, China, and Halifax, Canada. Standardized clinical, neuropsychological and brain imaging assessments were carried out at baseline and following acute and long term treatment with typical or atypical antipsychotic drugs. At the Hong kong site, we studied 84 subjects with first episode psychosis (n = 10 with EPS). At the Halifax site, we studied 40 subjects with first episode psychosis (n = 17 with EPS), and 23 healthy comparison subjects. Subjects with movement disorders prior to treatment (EPS+) had higher total PANSS scores at baseline (mean elevation 19.9% Hong kong, P = 0.016; 14.7% Halifax, P = 0.049). In subjects treated with atypical antipsychotics (all Halifax), EPS+ status at baseline predicted more movement disorders at long term follow up (P = 0.0005). In both cohorts, EPS+ subjects had poorer acute symptomatic treatment response assessed with the PANSS (Hong kong P = 0.005; Halifax P = 0.017). Neuropsychological impairment related to executive dysfunction appeared greater in a small sam- ple of EPS+ subjects (Hong kong, effect size 0.26-0.27, P < 0.05). Caudate volumes were 4.5% larger in EPS+ compared with EPS-subjects (Halifax P = 0.042), and correlations between striatal volumes and age were different in the EPS+ group. In conclu- sion, pre-treatment EPS is present in a substantial minority of subjects with first episode psych

关键词：药物治疗精神病体外症状运动障碍每股收益神经功能精神分裂症

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Element mapping the Merensky Reef of the Bushveld Complex

引用

Geoscience Frontiers 2021年第3期12卷 259-278页

作者： william smith Wolfgang Maier Stephen Barnes Gareth Moorhead David Reid Bartosz karykowski School of Earth and Ocean Sciences Cardiff UniversityCardiff CF240DEUnited Kingdom CSIRO Mineral Resources Perth 6160Australia CSIRO ClaytonVictoriaAustralia University of Cape Town South Africa Fugro Germany Land GmbH 12555 BerlinGermany

The Merensky Reef hosts one of the largest PGE resources *** has been exploited for nearly 100 years,yet its origin remains *** the present study,we characterised eight samples of the reef at four localities in the western Bushveld Complex using micro-X-ray fluorescence and field emission scanning electron *** results indicate that the Merensky Reef formed through a range of diverse *** exhibited by chromite grains at the base of the reef are consistent with supercooling and in situ *** local thickening of the Merensky chromitite layers within troughs in the floor rocks is most readily explained by granular *** and deformation textures in pyroxenes of the Merensky pegmatoid bear testament to recrystallisation and *** footwall rocks to the reef contain disseminations of PGE rich sulphides as well as olivine grains with peritectic reaction rims along their upper margins suggesting reactive downward flow of silicate and sulphide ***-hosted melt inclusions containing Cl-rich apatite,sodic plagioclase,and phlogopite suggest the presence of highly evolved,volatile-rich *** reverse zonation of cumulus plagioclase in the footwall of the reef indicates dissolution or partial melting of plagioclase,possibly triggered by flux of heat,acidic fluids,or hydrous ***,these data suggest that the reef formed through a combination of magmatic,hydrodynamic and hydromagmatic processes.

关键词： Merensky Reef Bushveld Complex Magmatic sulphide Platinum-group elements PGE Anorthosite

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Whole-mine subsidence over tabular deposits and related seismicity

引用

International Journal of Mining Science and Technology 2017年第1期27卷 171-177页

作者： Pariseau william G. McCarterr Michael k. Department of Mining Engineering University of UtahSalt Lake CityUTUSA

The challenge of estimating mine-wide subsidence and linkages to seismicity over tabular deposits is addressed by a special finite element technique(dual node–dual mesh). Subsidence and mine-induced seismicity begins near the face when caving occurs and propagates to the surface as extraction reaches a critical extent. Thus, the challenge is to obtain details at the face at the meter scale and also at the surface over the whole mine at the kilometer scale. Interactions between old and new sections of a mine are automatically taken into account with this technique. The finite element method is well established technology based on fundamentals of physical laws, kinematics and material laws. With this technique, no empirical ‘‘scaling" or fitting computer output by input data ‘‘adjustment" to mine measurements is necessary. Capability is demonstrated for doing practical whole-mine subsidence analysis from first principles. Mine-induced seismicity is shown to correlate well with face advance and element failure.

关键词： Whole mine subsidence Multi-scale Finite element analysis Mine induced seismicity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Granular activated carbons from palm nut shells for gold di-cyanide adsorption

引用

International Journal of Minerals,Metallurgy and Materials 2013年第2期20卷 172-179页

作者： william k.Buah Paul T.williams Energy Research Institute The University of LeedsLeeds LS2 9JTUnited Kingdom

Granular activated carbons were produced from palm nut shells by physical activation with steam. The proximate analysis of palm nut shells was investigated by thermogravimetric analysis, and the adsorption capacity of the activated carbons, produced as a result of shell pyrolysis at 600℃ followed by steam activation at 900℃ in varying activation times, was evaluated using nitrogen adsorption at 77 k. Applicability of the activated carbons for gold dicyanide adsorption was also investigated. Increasing the activation hold time with the attendant increase in the degree of carbon burn-off results in a progressive increase in the surface area of the activated carbons, reaching a value of 903.1 m2/g after activation for 6 h. The volumes of total pores, mieropores, and mesopores in the activated carbons also increase progressively with the increasing degree of carbon burn-off, resulting from increasing the activation hold time. The gold di-cyanide adsorption of the activated carbons increases with the rise of pore volume of the activated carbons. The gold di-cyanide adsorption of palm nut shell activated carbon obtained after 6-h activation at 900℃ is superior to that of a commercial activated carbon used for gold di-cyanide adsorption.

关键词： activated carbon adsorption gold cyanides processing pyrolysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：