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| 1 | Periodic solutions of a 2nth-order nonlinear difference equation显示文摘In this paper, a 2 nth-order nonlinear difference equation is considered.Using the critical point theory, we establish various sets of sufficient conditions of the nonexistence and existence of periodic solutions.Results obtained complement or improve the existing ones. | ZHOU Zhan 1, YU JianShe 1 & CHEN YuMing 21 School of Mathematics and Information Science, Guangzhou University, Guangzhou 510006, China 2 Department of Mathematics, Wilfrid Laurier University, Waterloo N2L 3C5, Canada | 2010 | Science China Mathematics2010，53，1： | 10 |
| 2 | Mercury in sediments and vegetation in a moderately contaminated salt marsh (Tagus Estuary, Portugal)显示文摘Depth variations of total mercury (Hg) and methylmercury (MeHg) concentrations were studied in cores from non-colonized sediments, sediments colonized by Halimione portulacoides, Sarcocornia fruticosa and Spartina maritima and belowground biomass, in a moderately contaminated salt marsh (Tagus Estuary, Portugal). Concentrations in belowground biomass exceeded up to 3 (Hg) and 15 (MeHg) times the levels in sediments, and up to 198 (Hg) and 308 (MeHg) times those found in aboveground parts. Methylmercury in colonized sediments reached 3% of the total Hg, 50 times above the maximum values found in non-colonized sediments. The absence of correlations between total Hg concentrations in sediments and the corresponding MeHg levels suggested that methylation was only dependent on the environmental and microbiological factors. The analysis of belowground biomass at high-depth resolution (2 cm) provided evidence that Hg and MeHg were actively absorbed from sediments, with higher enrichment factors at layers where higher microbial activity was probably occurring. The results obtained in this study indicated that the biotransformation of Hg to the toxic MeHg could increase the toxicity of plant-colonized sediments. | Joao Canário Carlos Vale Laurier Poissant Marta Nogueira Martin Pilote Vasco Branco | 2010 | Journal of Environmental Sciences2010，22，8： | 4 |
| 3 | New Genera-tion of Linux Meta-installers显示文摘 | Trezentos P Di Cosmo R Lauriere S | | 0，，： | 1 |
| 4 | Childhood leukemia around French nuclear power plants-the Geocap study, 2002-2007显示文摘 | Sermage-Faure C Laurier D Goujon-Bellec S | 2012 | Int J Cancer2012，131，5： | 1 |
| 5 | The effect of shear and oil/water ratio on the required hydrophile-lipophile balance tbr emulsification 显示文摘 | KLOET JANA KLOET SCHRAMM LAURIER L | 2002 | Journal of Surfactants and detergents2002，5，1： | 1 |
| 6 | Doses and lung cancer risks from exposure to radon and plutonium 显示文摘 | Marsh J W Harrison J D Laurier D | 2014 | Int J Radiat Biol2014，90，11： | 1 |
| 7 | A language and a program for stating and solv-ing combinatorial problems显示文摘 | Lauriere J L | 1978 | Artificial Intelligence1978，10，1： | 1 |
| 8 | Delayed rectifier and Ca^2 +-dependent K ^+ current in human esophagus:roles in regulating muscle contraction显示文摘 | Wade GR Laurier LG Preiksaitia HG | 1999 | Am J Physiol1999，277，4： | 1 |
| 9 | Clinical spectrum of bronchiogenic cysts of the mediastinum and lung in the adult显示文摘 | Georges SR Lauriers J | 1991 | Ann Thorac Surg1991，52，： | 1 |
| 10 | Risk analysis of Leukaemia incidence among people living along the Techa River :a nested case- control study显示文摘 | Ostroumova E B Gagniere D Laurier | 2006 | J Radiol Prot2006，26，1： | 1 |
| 11 | Aerodynamic estimation techniques for aerostats and airships 显示文摘 | Jones P S De Laurier D J | 1983 | Journal of Aircraft1983，20，2： | 1 |
| 12 | Enhanced capacitative calcium entry and TRPC channel gene expression in human LES smooth muscle显示文摘 | Wang J Laurier L G Sims S M | 2003 | Am J Physiol Gastrointest Liver Ph ysiol2003，284，： | 1 |
| 13 | Modeling the atmospheric transport and deposition of mercury to the Great Lakes显示文摘 | Mark Cohen Richard Artz Roland Draxler Paul Miller Laurier Poissant David Niemi Dominique Ratté Marc Deslauriers Roch Duval Rachelle Laurin Jennifer Slotnick Todd Nettesheim John McDonald | 2004 | Environmental Research2004，，3： | 1 |
| 14 | Limit dextrinase in cereal seeds显示文摘 | SERRE L LAURIERE C | 1989 | Sci Aliments1989，9，4： | 1 |
| 15 | A proposed framework for formulary listing in low-income countries显示文摘 | Diaby V Laurier C Lachaine J | | 0，，02： | 1 |
| 16 | Delayed rectifier and Ca2+-dependent K+ currents in human esophagus:roles in regulating muscle contraction显示文摘 | LAURIER L G PREIKSAITIS H G | 1999 | Am J Physiol1999，277，41： | 1 |
| 17 | Identifi- cation of nine sucrose non-fermenting 1-related pro- tein kinase 2 activated by hyperosmotie and saline stresses in Arabidopsis thaliana 显示文摘 | Boundsocq M Barbier-Brygoo H Lauriere C | 2004 | Journal of Bio- chemistry2004，279，41： | 1 |
| 18 | The morphology of non - equilibrium foam and gelled foam lamellae in porous media 显示文摘 | Schramm Laurier L | 1999 | Journal of Petroleum Science and Engineering1999，23，2： | 1 |
| 19 | Identification of nine sucrose nonfermenting 1-related protein kinases 2 activated by hyperosmotic and saline stresses in Arabidopsis thaliana 显示文摘 | Boudsocq M Barbier-Brygoo H Lauriere C | 2004 | Biological Chemistry2004，279，41： | 1 |
| 20 | Different phos-phorylation mechanisms are involved in the activation of sucrose non-fermenting 1 related protein kinase 2 by osmotic stresses and abscisc acid 显示文摘 | Boundsocq M Barbier Brygoo H Lauriere C | 2007 | Plant Molecular Biology2007，63，： | 1 |
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