检索结果-南通市图书馆

Journal of Ocean University of China 2019年第1期18卷 69-79页

作者： DENG Fangjing JIANG Wensheng valle-LEVINSON Arnoldo FENG Shizuo Physical Oceanography Laboratory/CIMST Ocean University of China and Qingdao National Laboratory for Marine Science and Technology Laboratory of Marine Environment and Ecology Ocean University of China Department of Civil and Coastal Engineering University of Florida

In this study, we examine the results obtained by the Finite-volume Coastal Ocean Circulation Model(FVCOM) regarding the effects of eddy viscosity and bathymetry on the three-dimensional(3 D) Lagrangian residual velocity(LRV) in a narrow bay. The results are cast in terms of two nondimensional numbers: the ratio of friction to local acceleration(δ) and the ratio of the minimum depth over shoals to the maximum depth in the channel(ε). The ratio δ depends on the eddy viscosity and mean depth. For a given eddy viscosity, when ε > 0.5, the along-estuary LRV tends to be vertically sheared and when ε < 0.5, the exchange is laterally sheared. When ε << 1, the structure of the 3 D, depth-integrated, and breadth-averaged LRV changes only slightly as δ increases. For ε values between 0.33 and 0.5, the structure of the 3 D LRV is mainly laterally sheared. In the same ε range, the 3 D and depth-integrated LRV exhibit reversed structures from high to low δ values. In addition, the breadth-averaged LRV weakens the typical twolayered circulation when δ decreases. When ε is 1, the two-layered vertical structure reverses direction, and a three-layered vertical structure develops in the outer bay as δ decreases.

关键词： eddy viscosity bathymetric effects Lagrangian residual velocity 3D narrow bay

2-Cys Peroxiredoxins Participate in the Oxidation of Chloroplast Enzymes in the Dark

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

Molecular Plant 2018年第11期11卷 1377-1388页

作者： valle Ojeda Juan Manuel Perez-Ruiz Francisco Javier Cejudo Instituto de Bioquimica Vegetaly Fotosintesis Universidad de Sevilla and Consejo Superior de lnvestigaciones CientificasAvenida Americo Vespucio 4941092SevillaSpain

Most redox-regulated chloroplast enzymes are reduced during the day and oxidized during the *** the reduction mechanism of light-dependent enzymes is well known,the mechanism mediating their oxidation in the dark remains *** thiol-dependent peroxidases,2-Cys peroxiredoxins (Prxs),play a key role in light-dependent reduction of chloroplast *** transfer reducing equivalents of thiols to hydrogen peroxide,suggesting the participation of these peroxidases in enzyme oxidation in the ***,we have addressed this issue by analyzing the redox state of well-known redox-regulated chloroplast enzymes in response to darkness in Arabidopsis thaliana mutants deficient in chloroplastlocalized Prxs (2-Cys Prxs A and B,Prx ⅡE,and Prx Q).Mutant plants lacking 2-Cys Prxs A and B,and plants overexpressing NADPH-dependent thioredoxin (Trx) reductase C showed delayed oxidation of chloroplast enzymes in the *** contrast,the deficiencies of Prx ⅡE or Prx Q exerted no *** vitro assays allowed the reconstitution of the pathway of reducing equivalents from reduced fructose 1,6-bisphosphatase to hydrogen peroxide mediated by Trxs and 2-Cys *** together,these results suggest that 2-Cys Prxs participate in the short-term oxidation of chloroplast enzymes in the dark.

关键词： chloroplast enzyme oxidation peroxiredoxin thioredoxin hydrogen peroxide darkness

Geovisualization with immersive virtual environments in theory and practice

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2019年第2期12卷 123-136页

作者： Florian Hruby Rainer Ressl and Genghis de la Borbolla del valle Department of Geomatics National Commission for the Knowledge and Use of Biodiversity(CONABIO)Mexico CityMexico

Virtual reality(VR)is a frequently emphasized issue on the Digital Earth(DE)*** current DE research is more engaged in the technical aspects of VR applications,this paper focuses on what is possible with immersive virtual environments(IVE)from the user’s *** a brief discussion of spatial presence and embodiment in the context of IVE,both concepts will be merged into a geovisualization immersion pipeline(GIP)as a framework with which to systematically link technical and cognitive aspects of *** will then analyze the general criteria that must be met by IVE in order to facilitate the experience of spatial *** these criteria to the special requirements of geospatial data,a definition of geovisualization immersive virtual environments(GeoIVE)is ***,the theoretical considerations of this paper are set into practice,using a GeoIVE of a coral reef ecosystem as an *** we shall see,while GIS do not provide data models or data compatibility for direct visualization of GeoIVE on VR output devices,game engines can serve as middleware to fill this gap.

关键词： Digital Earth geovisualization virtual reality immersive virtual environments spatial presence

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

电动海上飞行器打造绿色出行新方式

商业周刊（中文版） 2024年第1期 29-29页

作者： Magdalenadel valle 杜然(译) 不详

在20世纪60年代的时候,苏联的工程师曾经研发出一种飞机和船的结合体,它可以贴着大海或湖泊急速飞行。他们把这种交通工具叫做ekranoplan,也就是地效飞机,它利用了气流的特性,通过把空气向下推到表面来提供额外的升力。但这种飞行器仅... 详细信息

在20世纪60年代的时候,苏联的工程师曾经研发出一种飞机和船的结合体,它可以贴着大海或湖泊急速飞行。他们把这种交通工具叫做ekranoplan,也就是地效飞机,它利用了气流的特性,通过把空气向下推到表面来提供额外的升力。但这种飞行器仅生产了几十架,而且这种设计已经不大有人记得了。

关键词：地效飞机绿色出行飞行器交通工具结合体

Host preference of the bean weevil Zabrotes subfasciatus

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2008年第4期15卷 335-341页

作者： Isabel Ribeiro do valle Teixeira Angel Roberto Barchuk Fernando Sergio Zucoloto Department of Biology Centro Universitario da Fundacao Educacional de Guaxupe Minas Gerais Department of Biology Faculdade de Filosofia Ciencias e Letras de Ribeirao Preto Universidade de Sao Paulo Sao Paulo Department of Biological Sciences Universidade Federal de Alfenas UnifaI-MG Alfenas Minas Gerais Brazil

It is largely known that the range of an insect diet is mostly determined by oviposition behavior, mainly in species with endophytic larvae such as Zabrotes subfasciatus. However, the proximate factors determining host choice and the subsequent steps leading to the expansion or reduction of the host number and occasional host shifts are largely unknown. We analyzed various factors determining host preference of Z. subfasciatus through the evaluation of：（i） oviposition preference of a wild population of Z. subfasciatus on the usual host （bean） and unusual hosts （lentil, chickpea and soy）, and the performance of the offspring; （ii） artificial selection for increasing preference for hosts initially less frequently chosen; （iii） comparison of oviposition behavior between two different populations （reared for -30 generations in beans or chickpeas, respectively）; （iv） oviposition timing on usual and unusual hosts; and （v） identification of preference hierarchies. We found that when using unusual hosts, there is no correlation between performance and preference and that the preference hierarchy changes only slightly when the population passes through several generations on the less frequently accepted host. We also found a positive response to artificial selection for increasing oviposition on the less preferred host; however, when the host-choice experiment involved two varieties of the usual host, the response was faster than when the choice involved usual and unusual hosts. Finally, beetles reared on an unusual host （chickpea） for 26 generations showed similar good fitness on both usual and unusual hosts, indicating that the use of a new host does not necessarily result in the loss of performance on the original host. Nevertheless, this population showed lower fitness on the usual host than that of the original population, suggesting an underlying partial trade-off phenomenon which may contribute to a broadening of diet of this insect species.

关键词： artificial selection evolution Phaseolus Cicer plant-insect interaction

Amyloid fragments and their toxicity on neural cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Regenerative Biomaterials 2019年第2期6卷 121-127页

作者： Eva Bystrenova Zuzana Bednarikova Marianna Barbalinardo Cristiano Albonetti Francesco valle Zuzana Gazova Institute of Nanostructured Materials I.S.M.N–C.N.R. via Gobetti101Bologna 40129Italy Department of Biophysics Institute of Experimental Physics SASWatsonova 47Kosice 04353Slovakia

The formation of amyloid fibrils from soluble proteins is a common form of self-assembly phenomenon that has fundamental connections with biological functions and human *** was converted from its soluble native state into highly organized amyloid *** treatment was used to break amyloid fibrils to fibrillar fragments–*** force microscopy and fluorescence microscopy was employed to characterize the morphology of the amyloid assemblies and neural cells–amyloid *** results demonstrate that prefibrillar intermediated and their mixture with proteins exhibit toxicity,although native proteins and fibrils appear to have no effect on number of *** findings confirm that innocuous hen lysozyme can be engineered to produce both cytotoxic fibrillar fragments and non-toxic mature amyloid *** work further strengthens the claim that amyloid conformation,and not the identity of the protein,is key to cellular toxicity and the underlying specific cell death mechanism.

关键词： amyloid fibrils protein aggregation neural cells atomic force microscopy fluorescence microscopy

Spatiotemporal dynamics of coastal aquaculture and driving force analysis in Southeastern China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ecosystem Health and Sustainability 2020年第1期6卷 593-604,592页

作者： Zimin Ying Jing Wu Tomas Marin Del valle Wu Yang College of Environmental and Resource Sciences Zhejiang UniversityHangzhouChina

Introduction:Large-scale disordered coastal aquaculture development causes severe environmental ***,quantitative assessments of spatiotemporal dynamics and driving factors for coastal aquaculture are essential and urgent for coastal aquaculture ***:Using remote sensing products and geographic information science,we investigated the long-term landscape changes due to coastal aquaculture,and explored its underlying driving factors in the Ningde coastal region,Southeastern *** show that coastal aquaculture area increased from 90.65 km2 in 2003 to 96.08 km^(2) in 2016,and its structure underwent tremendous *** area of artificial shrimp ponds increased by 496.15%and the area of farmland ponds decreased by 25.81%between 2003 and *** addition,we revealed that from 2003 to 2016,the change trends of the coastal aquaculture area and the entire Ningde coastal region were consistent,and became more fragmented and ***,regression results indicate that the growth and attenuation of coastal aquaculture areas were significantly affected by the initial coastal aquaculture area in *** and Conclusion:To sustainably manage the coastal ecosystems,we provide several recommendations(e.g.,a coupled human and natural systems approach to understanding human-nature interactions,integrated assessment,and systematical spatial planning and monitoring)for future research and management.

关键词： Coastal ecosystem coastal management ecological civilization land use and land cover change marine ranching remote sensing

Potential utility of liquid biopsies in the management of patients with biliary tract cancers:A review

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 Gastrointestinal Oncology 2021年第9期13卷 1073-1085页

作者： Rohan Shotton Angela Lamarca Juan valle Mairéad G McNamara Department of Medical Oncology The Christie NHS Foundation TrustManchester M204BXUnited Kingdom Division of Cancer Sciences School of Medical SciencesFaculty of BiologyMedicine and HealthUniversity of ManchesterManchester M139PLUnited Kingdom

Biliary tract cancer,comprising gallbladder cancer,cholangiocarcinoma and ampullary cancer,represents a more uncommon entity outside high-endemic areas,though global incidence is *** majority of patients present at a late stage,and 5-year survival remains *** stage disease is incurable,and though palliative chemotherapy has been shown to improve survival,further diagnostic and therapeutic options are required in order to improve patient *** certain subtypes of biliary tract cancer are relatively rich in targetable mutations,attaining tumour tissue for histological diagnosis and treatment monitoring is challenging due to locoregional anatomical constraints and patient *** biopsies offer a safe and convenient alternative to invasive procedures and have great potential as diagnostic,predictive and prognostic *** this review,the current standard of care for patients with biliary tract cancer,future treatment horizons and the possible utility of liquid biopsies within a variety of contexts will be *** tumour DNA,circulating microRNA and circulating tumour cells are discussed with an overview of their potential applications in management of biliary tract cancer.A summary is also provided of currently recruiting clinical trials incorporating liquid biopsies within biliary tract cancer research.

关键词： Biliary tract cancer Liquid biopsy Circulating tumour DNA Cell free DNA Circulating tumour cells Biomarkers

Zika virus is arriving at the American continent

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2016年第10期9卷 997-999页

作者： Saul Levy-Blitchtein Juana del valle-Mendoza Medicine School Health Sciences FacultyUniversidad Peruana de Ciencias Aplicadas (UPC) Research Center and Innovation of the Health Sciences Faculty Universidad Peruana de Ciencias Aplicadas (UPC) Instituto de Investigación Nutricional (IIN)

Zika virus is the last arbovirosis arriving at the American continent and it is able to produce severe complications due to its neurotropism, such as microcephaly and it is also associated with Guillain-Barre syndrome(GBS). Presence of Aedes aegypti in many regions of Peru makes it easier to spread and it could be present in population, not being detected because there is a lack of rapid diagnosis methods. It is important to make a quick, effective and combined response to this new threat.

关键词： Zika virus Arbovirosis Dengue virus Chikungunya Aedes aegypti

Experimental study on fly ash capture mercury in flue gas

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2010年第4期53卷 976-983页

作者： Mercedes DíAZ-SOMOANO Patricia ABAD-valle M.Rosa MARTíNEZ-TARAZONA Instituto Nacional del Carbón(CSIC)

Systematic experiments were conducted on a fixed-bed reactor to investigate the interaction between fly ash and mercury,the results implied that fly ash can capture mercury *** different fly ashes,the unburned carbon in the FA2 and FA3 fly ashes has the highest mercury capture capacity,up to 10.3 and 9.36 μg/g,respectively,which is close to that of commercial activated *** is no obvious relationship between mercury content and carbon content or BET surface area of fly *** classification standard was applied to distinguish fly ash carbon *** content is not the only variable that controls mercury capture on fly ash,there are likely significant differences in the mercury capture capacities of the various carbon *** capture capacity mainly depends on the content of anisotropy carbon particles with porous network structure.

关键词： mercury fly ash unburned carbon petrography adsorption