检索结果-南通市图书馆

The Changing Cold Regions network:Observation,diagnosis and prediction of environmental change in the saskatchewan and Mackenzie River Basins,Canada

在线全文

学校读者我要写书评

暂无评论

science China earth sciences 2015年第1期58卷 46-60页

作者： chris M DeBeeR Howard s WHeATeR William L QUINTON sean K CAReY Ronald e sTeWART Murray D MACKAY Philip MARsH Global Institute for Water security University of SaskatchewanNational Hydrology Research Centre Cold Regions Research Centre Wilfrid Laurier University school of Geography and earth sciences Mc Master University Department of environment and Geography University of Manitoba science and Technology Branch Environment Canada

Climate change is causing rapid and severe changes to many earth systems and processes,with widespread cryospheric,ecological,and hydrological impacts globally,and especially in high northern *** is of major societal concern and there is an urgent need for improved understanding and predictive tools for environmental *** Changing Cold Regions network(CCRN)is a Canadian research consortium with a focus to integrate existing and new experimental data with modelling and remote sensing products to understand,diagnose,and predict changing land,water,and climate,and their interactions and feedbacks over the geographic domain of the Mackenzie and saskatchewan River Basins in *** network operates a set of 14 unique and focused Water,ecosystem,Cryosphere and Climate(WeCC)observatories within this region,which provide opportunities to observe and understand processes and their interaction,as well as develop and test numerical simulation models,and provide validation data for remote sensing *** paper describes this network and its observational,experimental,and modelling *** overview of many of the recent earth system changes observed across the study region is provided,and some local insights from WeCC observatories that may partly explain regional patterns and trends are *** of the model products being developed are discussed,and linkages with the local to international user community are reviewed—In particular,the use of WeCC data towards model and remote sensing product calibration and validation is *** future activities and prospects for the network are also presented at the end of the paper.

关键词： climate change cryosphere hydrology atmospheric science ecology modelling Canada

Optical clearing of the mouse skull

在线全文

学校读者我要写书评

暂无评论

Light(science & Applications) 2022年第10期11卷 2267-2268页

作者： chris Xu school of Applied and engineering Physics Cornell UniversityIthacaNY 14853USA

High spatial resolution imaging of the mouse brain through the intact skull is challenging because of the skull-induced aberration and *** research group of Dan Zhu from Huazhong University of science and Technology has developed a skull-clearing technique that provides a long-term(~weeks),stable,transparent window for high resolution optical imaging over a large field of view.

关键词： scattering. transparent Optical

Consumption of rice and fish in an electronic waste recycling area contributes significantly to total daily intake of mercury

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

Journal of environmental sciences 2015年第12期27卷 83-86页

作者： Hanyong Peng Michael s.Reid X.chris Le Division of Analytical and environmental Toxicology Department of Laboratory Medicine and PathologyUniversity of Alberta

Mercury is a global pollutant due to its widespread use,emission,and long-range transport（Blum,2013;Pacyna et al.,2010）.It is considered a priority pollutant due to its neurological toxicity,persistence,and bioaccumulation（Pacyna et al.,2010;sharma et al.,2015）.Mercury pollution can occur when products that contain mercury are improperly disposed of and mercury is released into the air,water,and soil（Zhang and Wong,2007）.An estimated 22%of the annual world usage of mercury is in electrical equipment such as batteries,thermometers,and discharge lamps,and electronic devices such as monitors and

关键词： Mercury Methyl mercury electronic waste Biomonitoring Dietary intake Human exposure assessment environmental health

Prograde and retrograde growth of monazite in migmatites:An example from the Nagercoil Block,southern India

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2015年第3期6卷 373-387页

作者： Tim e.Johnson chris Clark Richard J.M.Taylor M.santosh Alan s.Collins Department of Applied Geology The Institute for Geoscience Research(TIGeR)Curtin University school of the earth sciences and Resources China University of Geosciences(Beijing) Tectonics Resources and Exploration(TRaX)Department of Earth SciencesUniversity of Adelaide

Data from a migmatised metapelite raft enclosed within charnockite provide quantitative constraints on the pressure-temperature-time （P-T-t） evolution of the Nagercoil Block at the southernmost tip of peninsular India. An inferred peak metamorphic assemblage of garnet, K-feldspar, sillimanite, plagioclase, magnetite, ilmenite, spinel and melt is consistent with peak metamorphic pressures of 6-8 kbar and temperatures in excess of 900 ℃. subsequent growth of cordierite and biotite record high-temperature retrograde decompression to around 5 kbar and 800 ℃. sHRIMP U-Pb dating of magmatic zircon cores suggests that the sedimentary protoliths were in part derived from felsic igneous rocks with Palae- oproterozoic crystallisation ages. new growth of metamorphic zircon on the rims of detrital grains constrains the onset of melt crystallisation, and the minimum age of the metamorphic peak, to around 560 Ma. The data suggest two stages of monazite growth. The first generation of Ree-enriched monazite grew during partial melting along the prograde path at around 570 Ma via the incongruent breakdown of apatite. Relatively Ree-depleted rims, which have a pronounced negative europium anomaly, grew during melt crystallisation along the retrograde path at around 535 Ma. Our data show the rocks remained at suprasolidus temperatures for at least 35 million years and probably much longer, supporting a long-lived high-grade metamorphic history. The metamorphic conditions, timing and duration of the implied clockwise P-T-t path are similar to that previously established for other regions in peninsular India during the ediacaran to Cambrian assembly of that part of the Gondwanan supercontinent.

关键词： Monazire Migmatite Zircon Geochronology Phase equilibria modelling Gondwana

Fluoroacetate in plants - a review of its distribution, toxicity to livestock and microbial detoxification

在线全文

学校读者我要写书评

暂无评论

Journal of Animal science and Biotechnology 2017年第4期8卷 813-823页

作者： Lex ee Xiang Leong shahjalal Khan Carl K. Davis stuart e. Denman chris.s. mcs.e.ne. school of Chemistry and Molecular Bioscience University of Queensland St Lucia 4072 QLD Australia. school of Agriculture and Food sciences University of Queensland St Lucia 4072 QLD Australia CsIRO Agriculture and Food Queensland Bioscience Precinct St Lucia 4072 QLD Australia

Fluoroacetate producing plants grow worldwide and it is believed they produce this toxic compound as a defence mechanism against grazing by herbivores. Ingestion by livestock often results in fatal poisonings, which causes significant economic problems to commercial farmers in many countries such as Australia, Brazil and south *** approaches have been adopted to protect livestock from the toxicity with limited success including fencing,toxic plant eradication and agents that bind the toxin. Genetically modified bacteria capable of degrading fluoroacetate have been able to protect ruminants from fluoroacetate toxicity under experimental conditions but concerns over the release of these microbes into the environment have prevented the application of this ***, a native bacterium from an Australian bovine rumen was isolated which can degrade fluoroacetate. This bacterium, strain MFA1, which belongs to the synergistetes phylum degrades fluoroacetate to fluoride ions and acetate. The discovery and isolation of this bacterium provides a new opportunity to detoxify fluoroacetate in the rumen. This review focuses on fluoroacetate toxicity in ruminant livestock, the mechanism of fluoroacetate toxicity,tolerance of some animals to fluoroaceate, previous attempts to mitigate toxicity, aerobic and anaerobic microbial degradation of fluoroacetate, and future directions to overcome fluoroacetate toxicity.

关键词： Aerobic Anaerobic Degradation Dehalogenase Fluoroacetate 1080 synergistetes TCA Toxicity

Rice:Reducing arsenic content by controlling water irrigation

在线全文

学校读者我要写书评

暂无评论

Journal of environmental sciences 2015年第4期27卷 129-131页

作者： Ashley M.newbigging Rebecca e.Paliwoda X.chris Le University of Alberta

Arsenic has long been recognized as a *** in water supplies that are used for both drinking and crop irrigation can expose many people chronically to elevated levels of arsenic.

关键词： Arsenic Cadmium Rice Food Water irrigation Metal contamination

Visualization of fingerprints made easy with dye solution on cellulose membrane

在线全文

学校读者我要写书评

暂无评论

science China Chemistry 2018年第4期61卷 375-376页

作者： Jagdeesh s.Uppal Xing-Fang Li X.chris Le Division of Analytical and environmental Toxicology Department of Laboratory Medicine and PathologyFaculty of Medicine and DentistryUniversity of Alberta

Fingerprinting has been used for over 100 years,especially for forensic investigations,personal identification,and law enforcement[1].Although reagent-based detection of fingerprints has been used since it was introduced in the 1880＇s,this technique has several shortcomings,such as the use of harmful reagents,laborious protocols,and the destruction of samples.

关键词：指纹纤维素膜可视化染料法律实施试剂

editorial: effect of root anatomy and apoplastic barrier development on cadmium uptake in rice

在线全文

学校读者我要写书评

暂无评论

Journal of environmental sciences 2019年第5期31卷 361-363页

作者： Karen s.Hoy Jagdeesh s.Uppal X.chris Le Department of Chemistry University of Alberta Division of Analytical and environmental Toxicology Department of Laboratory Medicine and Pathology Faculty of Medicine and Dentistry University of Alberta

Cadmium (Cd) is a toxic metal with high mobility from soil and known translocation into plants (song et al., 2015).Because the main source of human exposure to Cd is from food consumption, there has been increased res... 详细信息

关键词： Metal contamination Cadmium uptake and translocation Rice cultivar and roots Arsenic,lead,manganese,zinc Water and soil Apoplastic barrier