检索结果-南通市图书馆

Rapid ongoing decline of Baird’s tapir in Cusuco National Park, Honduras

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Integrative Zoology 2012年第4期7卷 420-428页

作者： Niall P.McCANN phil M.WHEELER Tim COLES Michael W.BRUFORD School of Biosciences Cardiff UniversityCardiffUK Centre for Environmental and Marine Sciences University of HullScarboroughUK Operation Wallacea Wallace HouseOld BolingbrokeUK

During the International Tapir Symposium 16-21 Oct 2011,the conservation of Baird's tapir(Tapirus baindi)in Honduras received a boost with the signing of a memorandum of understanding between the Minister Direc-tor of the Honduran Instute of Conservation and Forestry(CF)and the Tapir Specialist Group(TSG)Despite this agreement,accelerating levels of hunting and habitat loss contimue to pose a threat to Baird's tapir in *** ongoing study in Cusuco National Park in northwestern Honduras has been monitoring changes in population dynamics of Baird's tapir since 2006 through the collection of occupancy *** study has iden-tified an increase in hunting pressure,coinciding with a drastic decline in the encounter rate with Baird's tapir ***,we examine the significance of a range of demographic variables on Baird's tapir occupancy in Cu-suco National Park using the software PRESENCE,and simulate the effects of different management strategies on the fiuture dynamics of the population using the stochastic simulation software VORTEX The predictions of the theoretical population models are compared to observed changes in occupancy *** found that non-intervention resulted in the local extinction of Baird's tapir within a very short time fiame,but that various in-tervention models enabled the population to recover to near carrying *** and extinction prob-ability were shown to respond marlkedly to the increase in hunting pressure;and occupancy models supported the fiuture population predictions generated by *** study suggests that immediate intervention is re-quired to reduce hunting pressure to near historical levels to prevent the imminent 1ocal extinction of the species.

关键词： Baird's tapir Honduras population viability analysis PRESENCE VORTEX

Comparative Transcriptomic Profiling of Vitis vinifera Under High Light Using a Custom-Made Array and the Affymetrix GeneChip

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2011年第6期4卷 1038-1051页

作者： Luisa C. Carvalho Belmiro J. Vilela phil M. Mullineaux Sara Amancio CBAA Instituto Superior de Agronomia Universidade Tecnica de Lisboa Tapada da Ajuda 1349-017 Lisboa Portugal DDSB John Innes Centre Colney Norwich NR4 7UH UK Department of Biological Sciences University of Essex Colchester CO4 3SQ UK

Understanding abiotic stress responses is one of the most important issues in plant research nowadays. Abiotic stress, including excess light, can promote the onset of oxidative stress through the accumulation of reactive oxygen species. Oxidative stress also arises when in vitro propagated plants are exposed to high light upon transfer to ex vitro. To determine whether the underlying pathways activated at the transfer of in vitro grapevine to ex vitro conditions reflect the processes occurring upon light stress, we used Vitis vinifera Affymetrix GeneChip （VvGA） and a custom array of genes responsive to light stress （LSCA） detected by real-time reverse transcriptase PCR （qRT-PCR）. When gene-expression profiles were compared, ＇protein metabolism and modification＇, ＇signaling＇, and ＇anti-oxidative＂ genes were more represented in LSCA, while, in VvGA, ＇cell wall metabolism＇ and ＇secondary metabolism＇ were the categories in which gene expression varied more significantly. The above functional categories confirm previous studies involving other types of abiotic stresses, enhancing the common attributes of abiotic stress defense pathways. The LSCA analysis of our experimental system detected strong response of heat shock genes, particularly the protein rescuing mechanism involving the cooperation of two ATP-dependent chaperone systems, Hsp100 and Hsp70, which showed an unusually late response during the recovery period, of extreme relevance to remove non-functional, potentially harmful polypeptides arising from misfolding, denaturation, or aggregation brought about by stress. The success of LSCA also proves the feasibility of a custommade qRT-PCR approach, particularly for species for which no GeneChip is available and for researchers dealing with a specific and focused problem.

关键词： Quantitative real-time PCR Vitis vinifera GeneChip light stress Heat Shock Proteins oxidative and photooxidative stress.

一种嗜热耐酸古细菌JP2菌株编码的热稳定DNA连接酶的生物化学及酶学特性研究(英文)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

生物化学与生物物理进展 2006年第9期33卷 881-889页

作者：兰海燕刘纯 HENDRY phil 新疆大学生命科学与技术学院新疆生物资源基因工程重点实验室乌鲁木齐830046 Molecular Science Division CSIRONorth RydeNSW1670Australia

对分离自巴布亚新几内亚地热活跃区的一种嗜热耐酸古细菌——JP2菌株中的DNA连接酶基因进行了克隆、表达、纯化,并对其生物化学及酶学特性进行了研究.对其核酸及氨基酸序列的分析表明:JP2菌株的DNA连接酶与古细菌种Sulfolobussolfatari... 详细信息

对分离自巴布亚新几内亚地热活跃区的一种嗜热耐酸古细菌——JP2菌株中的DNA连接酶基因进行了克隆、表达、纯化,并对其生物化学及酶学特性进行了研究.对其核酸及氨基酸序列的分析表明:JP2菌株的DNA连接酶与古细菌种Sulfolobussolfataricus和Sulfolobusshibatae的DNA连接酶具有很高的同源性,尤其在与功能紧密相关的6个保守结构基序的一致性更高.JP2连接酶表现出高的DNA缺口连接活性,在二价金属辅因子的选择方面,JP2连接酶更倾向于Mn2+离子而不是Mg2+、Ca2+及其他离子.不同温度时的热稳定性测试显示:JP2连接酶在50～80℃时为较适连接温度,当温度不超过85℃时,连接酶的活性在5h内保持相对稳定,但在90℃以上活性则很快降低.还分离纯化了JP2的分子伴侣——TF55,并将其应用于增加JP2连接酶的热稳定性研究.结果表明:在体外85℃时,分子伴侣未增加连接酶的热稳定性,可能的原因是在85℃体外状态下TF55本身就表现出不稳定性.

关键词： DNA连接酶 Sulfolobus spp. 嗜热耐酸古细菌耐热性分子伴侣TF55

Influence of Inhomogeneity on the Estimation of Mean and Extreme Temperature Trends in Beijing and Shanghai

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2001年第3期18卷 309-322页

作者：严中伟杨赤 phil Jones LASG Institute of Atmospheric Physics Chinese Academy of Sciences CRU University of East Anglia

Inhomogeneities in the temperature series from Beijing and Shanghai are analyzed, using the detailed histories of both sets of observations. The major corrections for different periods range from ?0.33 to 0.6°C for Beijing and ?0.33 to 0.3°C for Shanghai, Annual mean and extreme temperature series are deduced from the daily observations and trends in the adjusted and unadjusted series are compared. The adjusted yearly mean temperatures show a warming trend of 0.5°C/ century since the turn of this century and an enhanced one of 2.0°C/ century since the 1960s. In contrast, the unadjusted data show a twice this value trend for Shanghai but little trend for Beijing at the long-term scale and overestimate the recent warming by 50%–130%. Beijing experienced a decrease of frequency of the extremes together with a cooling during the 1940s–1970s and an increase of frequency of extremes together with a warming since then. The trends of frequency of extremes at Shanghai were more or less opposite. It is implied that the regional trends of strong weather variations may be different even when the regional mean temperatures coherently change. Key words Inhomogeneity - Daily temperature series - Climatic warming - Extreme temperature The study was supported by the China NKBRSF Project G 1999043400, IAP/ DF and CAS project (KZ951-A1-402).

关键词： Inhomogeneity Daily temperature series Climatic warming Extreme temperature

Parameters of a severe disease course in ulcerative colitis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第35期20卷 12574-12580页

作者： Andreas Stallmach Luisa Nickel Thomas Lehmann Bernd Bokemeyer Martin Bürger Dietrich Hüppe Wolfgang Kruis Susanna Nikolaus Jan C Preiss Andreas Sturm Niels Teich Carsten Schmidt Klinik für Innere Medizin Ⅳ Universit?tsklinikum JenaJena 07747Germany Zentrum für klinische Studien Universit?tsklinikum JenaJena 07747Germany Gastroenterologische Gemeinschaftspraxis Minden 32423Germany Gastroenterologische Gemeinschaftspraxis Herne 44623Germany Evangelisches Krankenhaus Kalk K?ln 51103Germany Klinik für Innere Medizin Christian Albrechts-Universit?tKiel 24105Germany Medizinische Klinik I Campus Benjamin FranklinCharitéBerlin 12203Germany Medizinische Klinik Campus Berlin MitteCharitéBerlin 13353Germany Krankenhaus Waldfriede Berlin 14163Germany Internistische Gemeinschaftspraxis für Verdauungsund Stoffwechselkrankheiten Leipzig 04105Germany

AIM: To detect high risk patients with a progressive disease course of ulcerative colitis (UC) requiring immunosuppressive therapy (IT).

关键词： Clinical practice Parameter Prediction model Ulcerative colitis Inflammatory bowel disease

New treatments for inflammatory bowel disease

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 1998年第5期4卷 6-13页

作者： David S. Rampton and D.phil

ＩＮＴＲＯＤＵＣＴＩＯＮＡｌｔｈｏｕｇｈｉｎｆｌａｍｍａｔｏｒｙｂｏｗｅｌｄｉｓｅａｓｅ（ＩＢＤ）ｉｓａｐｐａｒｅｎｔｌｙｓｔｉｌｒｅｌａｔｉｖｅｌｙｒａｒｅｉｎｔｈｅＥａｓｔ，ｅｖｉｄｅｎｃｅｆｒｏｍＨｏｎｇＫｏｎ... 详细信息

ＩＮＴＲＯＤＵＣＴＩＯＮＡｌｔｈｏｕｇｈｉｎｆｌａｍｍａｔｏｒｙｂｏｗｅｌｄｉｓｅａｓｅ（ＩＢＤ）ｉｓａｐｐａｒｅｎｔｌｙｓｔｉｌｒｅｌａｔｉｖｅｌｙｒａｒｅｉｎｔｈｅＥａｓｔ，ｅｖｉｄｅｎｃｅｆｒｏｍＨｏｎｇＫｏｎｇｓｕｇｇｅｓｔｓｔｈａｔｏｖｅｒ...

关键词： Crohn′s disease ulcerative colitis inflammatory bowel disease corticosteroids mesalazine immunosuppressive drugs cytokines

Health and safety perspectives of graphene in wearables and hybrid materials

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第24期155卷 10-32页

作者： Premika Govindaraj Azadeh Mirabedini Xing Jin Dennis Antiohos Nisa Salim phil Aitchison Jake Parker Franz Konstantin Fuss Nishar Hameed Faculty of Science Engineering and Technology Swinburne University of Technology Hawthorn Melbourne VIC 3122 Australia Aerospace Engineering and Aviation School of Engineering RMIT University Bundoora Melbourne VIC 3083 Australia Institute for Frontier Materials Deakin University Geelong VIC 3216 Australia Imagine Intelligent Materials Sydney NSW 2018 Australia Sparc Technologies Kent Town South Australia 5067 Australia Chair of Biomechanics Faculty of Engineering Science University of Bayreuth Bayreuth D-95440 Germany

The growing demand for smart wearables, coupled with the omnipresence of graphene due to its array of outstanding thermal, electrical, and mechanical properties, have driven the industry-led initiatives to develop lightweight, smart, and robust graphene-based wearable technologies. The substantial research and the increase in technology readiness levels (TRLs) of graphene-based technologies have led to the adoption of graphene in many industries. Graphene-based wearables are one such technology that involves closer interaction of graphene by the end-user. Despite this, understanding the toxicological risks associated with using graphene-based wearables is still in the fundamental stage. Herein, graphene-based wearables and industrial-scale fabrication techniques for the development of graphene-based wearables are reviewed. The main goal of the review is to initially evaluate the likelihood of user exposure to graphene from the wearable device and the potential health effects. The subsequent health risks based on graphene's physicochemical characteristics are also discussed. A framework to elucidate the risk is presented in terms of crucial exposure routes, possible graphene interactions, recent exposure assessments, detection removal techniques from the human body, and risk management protocols. It is hoped that this review may aid towards establishing a reasonable practice concerning the safe integration of graphene materials into wearables and facilitate their commercialization.

关键词： Graphene Wearables Composites Nanomaterials Smart materials Health and safety

Advantage of Preserving Bi-orientation Structure of Isotactic Polypropylene through Die Drawing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2021年第1期39卷 91-101,I0007页

作者： Dong Lyu Ying-Ying Sun Yu-Qing Lai Glen Thompson philip Caton-Rose phil Coates Ying Lu Yong-Feng Men State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Science and Technology of China School of Applied Chemistry and EngineeringHefei 230026China Exxon Mobil Asia Paciﬁc Research&Development Co. Ltd.Shanghai 200241China Polymer Interdisciplinary Research Centre University of BradfordBradford BD71DPUK

The isotactic polypropylene(iPP) usually shows a unique parent-daughter lamellae structure in which the parent and daughter lamellae are against each other with a near perpendicular angle(80° or 100°). Inducing a high fraction of oriented cross-hatched structure in iPP during processing is desirable for designing the bi-oriented iPP products. We processed a commercial iPP via tensile-stretching and die-drawing to evaluate the structural evolution of oriented parent-daughter lamellae. It turned out that the die-drawing process had an advantage in attaining a high fraction of oriented cross-hatched structure of iPP, as compared to the free tensile stretching. Besides, the presence of α-nucleating agents affected the formation of oriented parent-daughter lamellae in the die-drawn samples whereas such influence diminished in the free stretched ones. It was found that the confined deformation inside the die led to the well-preserved oriented cross-hatched structure in the die-drawn iPP.

关键词： Die-drawing Isotactic polypropylene Solid-state deformation Bi-orientation WAXD

Attribution of explanatory factors for change in soil organic carbon density in the native grasslands of Inner Mongolia,China

在线全文

学校读者我要写书评

暂无评论

Journal of Arid Land 2018年第3期10卷 375-387页

作者： JIN Dongyan phil J MURRAY XIN Xiaoping QIN Yifei CHEN Baorui QING Gele ZHANG Zhao YAN Ruirui Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Department of Sustainable Soils and Grassland Systems Rothamsted Research North Wyke Department of Grassland Ecology and Animal Husbandry Xilingol Vocational College

The variation in soil organic carbon density（SOCD） has been widely documented at various spatial and temporal scales. However, an accurate method for examining the attribution of explanatory factors for change in SOCD is still lacking. This study aims to attribute and quantify the key climatic factors, anthropogenic activities, and soil properties associated with SOCD change in the native grasslands of Inner Mongolia, China, by comparing data between the 1960s and the 2010s. In 2007 and 2011, we resampled 142 soil profiles which were originally sampled during 1963–1964 in the native grasslands of Inner Mongolia. SOCD was determined in A horizon（eluvial horizon） of the soil. We selected the explanatory factors based on a random forest method, and explored the relationships between SOCD change and each of the explanatory factors using a linear mixed model. Our results indicated that the change in SOCD varied from the east to the west of Inner Mongolia, and SOCD was 18% lower in the 2010s than in the 1960s. The lower SOCD in the 2010s may primarily be attributed to the increasing in mean annual water surface evaporation, which explained approximately 10% and 50% of the total variation and explainable variation in the change in SOCD, respectively. The sand content of the soil is also a significant explanatory factor for the decrease in SOCD, which explained about 4% and 21% of the total variation and explainable variation in the change in SOCD, respectively. Furthermore, the collection of quantitative information on grazing frequency and duration may also help to improve our understanding of the anthropogenic factors that govern the change in SOCD.

关键词： soil organic carbon climate change soil texture mixed linear model effect isolation native grasslands