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71篇 您的检索式:作者名="Polya"
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1不同施肥处理对水稻根表铁和砷形态的影响显示文摘采用XAFS研究盆栽试验砷污染土壤中添加不同肥料后,苗期水稻根表铁膜和砷的矿物学特征.Fe的K边EXAFS谱表明,铁膜主要由2-line水铁矿组成,还有少部分针铁矿和赤铁矿等晶体矿;As的EX-AFS谱显示,除了KNO3和K2SO4处理外,其余处理的铁膜中砷以三价砷为主.KNO3处理显著减少了水稻根表铁膜的形成,而且抑制了水稻对砷的吸收.不同的肥料可以影响铁膜中砷的存在形态.陈学萍 朱永官 洪米娜 王新军 Gault A G Charnock J M Polya D A 2008环境化学2008,27,2:16
2Contrasting sorption behaviours affecting groundwater arsenic concentration in Kandal Province,Cambodia显示文摘Natural arsenic (As) contamination of groundwater which provides drinking water and/or irrigation supplies remains a major public health issue,particularly in South and Southeast Asia.A number of studies have evaluated various aspects of the biogeochemical controls on As mobilization in aquifers typical to this region,however many are predicated on the assumption that key biogeochemical processes may be deduced by sampled water chemistry.The validity of this assumption has not been clearly established even though the role of sorption/desorption of As and other heavy metals onto Fe/Mn (hydr) oxides is an important control in As mobilization.Here,selective chemical extractions of sand-rich and clay-rich sediments from an As-affected aquifer in Kandal Province,Cambodia,were undertaken to explore the potential role of partial re-equilibrium through sorption/desorption reactions of As and related solutes (Fe,Mn and P) between groundwater and the associated solid aquifer matrix.In general,groundwater As is strongly affected by both pH and Eh throughout the study area.However,contrasting sorption behaviour is observed in two distinct sand-dominated (T-Sand) and clay dominated (T-Clay) transects,and plausibly attributed to differing dominant lithologies,biogeochemical and/or hydrogeological conditions.Sorption/desorption processes appear to be re-setting groundwater As concentrations in both transects,but to varying extents and in different ways.In T-Sand,which is typically highly reducing,correlations suggest that dissolved As may be sequestered by sorption/re-adsorption to Fe-bearing mineral phases and/or sedimentary organic matter;in T-Clay Eh is a major control on As mobilization although binding/occlusion of Fe-bearing minerals to sedimentary organic matter may also occur.Multiple linear regression analysis was conducted with groups categorised by transect and by Eh,and the output correlations support the contrasting sorption behaviours encountered in this study area.Irrespective of transect,however,the key biogeochemical processes which initially control As mobilization in such aquifers,may be “masked” by the re-setting of As concentrations through in-aquifer sorption/desorption processes.Laura A. Richards Maria J. Casanueva-Marenco Daniel Magnone Chansopheaktra Sovann Bart E. van Dongen David A. Polya 2019Geoscience Frontiers2019,10,5:2
3Cloning of p27Kip1,a cyclin-dependent kinase inhibitor and a potential mediatorof extracellular antimitogenic signals显示文摘POLYA K LEEMONGHONG ERDJUMENT BROMAGE H 1994Cell1994,78,1:1
4p27kipl,a eyelin-CDK in hibitor, links transforming growth factor-beta and contact inhibition to cell cycle arrest显示文摘Polya K Kato J Soloman MJ 1994Genes Bey1994,8,1:1
5Rice is a major exposure route for arsenic in Chakdaha block, Nadia district, West Bengal, India: A probabilistic risk assessment 显示文摘Mondal D Polya D A 2008Ap- plied Geochemistry2008,23,11:1
6Arsenic hazard in shal- low Cambodian groundwater 显示文摘Polya D A Gault A G Diebe N 2005Mineralogical Magazine2005,69,5:1
7Efficiency of hydrothermal ore formation and the Panasqueira W-Cu (Ag)-Sn vein deposit显示文摘Polya D A 1988333: 838-8411988,333,:1
8Rice is a major exposure route for arsenic in Chakdaha block, Nadia district, West Bengal, India: A probabilistic risk assessment显示文摘Debapriya Mondal David A. Polya 2008Applied Geochemistry2008,,11:1
9Particle size distribution of minerals phases and metals in dusts collected at different work-phces显示文摘Hlavay J Polya K K Wesemann G 1992J Anal Chem1992,344,:1
10On the ratio of consecutive eigenvalues显示文摘PAYNE L E POLYA G WEINBERGER H F 1956J Math and Phis1956,35,:1
11Purification and characterization of wheat and pine small basic protein substrates for plant calcium-dependent protein kinase 显示文摘G M Polya 1992Protein Structure and Molecular Enzymology1992,1120,3:1
12On the eigenvalues of vibrating membranes显示文摘POLYA G 1961Proc London Math Soc1961,11,3:1
13On the ratio of consecutive eigenvalues显示文摘Payne L E Polya G and Weinberger H F 1956J Mathand Physics1956,35,:1
14Cloning of p27kipi, a cyclin-dependent kinase inhibitor and a potential mediator of extracellular antimitogenic signals 显示文摘Polya K Lee MH Erdjument BH 1994Cell1994,78,1:1
15Ubereine Aufgabe der Wahrscheinlichkeitsrechnung betreffend die Irrfahrt im Strassen- netz显示文摘Polya G 1921Math Ann1921,84,:1
16(ber einen Zusammen- hang zwischen der Konvergenz yon Polynomfolgen und der Verteilung ihrer Wurzeln 显示文摘POLYA G LINDWART E 1914Rend Pal1914,37,:1
17Comprehensive heterocyclic chemistry显示文摘Polya J A 1983Pergamon Oxford1983,1,5:1
18Analysis of fountain solutions for anionic components,including alkylbenzenesulfonates,carboxylat es and polyphosphates,by a combination of ion-exchange and ion-exclusion chromatography and inductively coupled plasma atomic emission spectrometry显示文摘BEWSI-IER A D POLYA D A LYTHGOE P R 2001Journal of Chromatography A2001,,920:1
19Activation of wheat embryo calcium- regulated protein kinase by unsaturated fatty acids in the presence and absence of calcium 显示文摘Lucantoni A Polya G M 1987FEBS Lett1987,221,1:1
20Selective inhibition of cyclic AMP-dependent protein kinase by amphiphilic triterpenoids and related compounds显示文摘Wang B H Polya G M 1996Phytochemistry1996,41,:1
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