نتایج جستجو برای: freshwaters

تعداد نتایج: 786  

2010
Cristiano Nogueira Paulo A. Buckup Naercio A. Menezes Osvaldo T. Oyakawa Thais P. Kasecker Mario B. Ramos Neto José Maria C. da Silva

BACKGROUND Freshwaters are the most threatened ecosystems on earth. Although recent assessments provide data on global priority regions for freshwater conservation, local scale priorities remain unknown. Refining the scale of global biodiversity assessments (both at terrestrial and freshwater realms) and translating these into conservation priorities on the ground remains a major challenge to b...

Journal: :Biomicrofluidics 2013
Coralie Suscillon Orlin D Velev Vera I Slaveykova

The capability of the AC dielectrophoresis (DEP) for on-chip capture and chaining of microalgae suspended in freshwaters was evaluated. The effects of freshwater composition as well as the electric field voltage, frequency, and duration, on the dielectrophoretic response of microalga Chlamydomonas reinhardtii were characterized systematically. Highest efficiency of cell alignment in one-dimensi...

2016
Baoli Wang Cong-Qiang Liu Stephen C. Maberly Fushun Wang Jens Hartmann

Carbon (C) and silicon (Si) biogeochemical cycles are important factors in the regulation of atmospheric CO2 concentrations and hence climate change. Theoretically, these elements are linked by chemical weathering and organism stoichiometry, but this coupling has not been investigated in freshwaters. Here we compiled data from global rivers and lakes in the United States of America and the Unit...

2015
David M. Snider Jason J. Venkiteswaran Sherry L. Schiff John Spoelstra

Rising concentrations of nitrous oxide (N2O) in the atmosphere are causing widespread concern because this trace gas plays a key role in the destruction of stratospheric ozone and it is a strong greenhouse gas. The successful mitigation of N2O emissions requires a solid understanding of the relative importance of all N2O sources and sinks. Stable isotope ratio measurements (δ15N-N2O and δ18O-N2...

2013
Addis Ababa Jos Snoeks Abebe Getahun

abell, R. 2013. ‘Conservation and Management of Freshwaters in a Changing World. In J. Snoeks & A. Getahun (eds), Proceedings of the Fourth International Conference on African Fish and Fisheries, Addis Ababa, Ethiopia, 22-26 September 2008. Tervuren: Royal Museum for Central Africa, ‘Zoological Documentation Online Series’, pp. 7-20. Inland water systems and species are on average around the wo...

Journal: :Environmental science & technology 2004
Ismail I Fasfous Tahir Yapici John Murimboh Nouri M Hassan Chuni L Chakrabarti Margaret H Back David R S Lean D Conrad Grégoire

Freshwaters are recognized as dynamic systems that may be far-removed from equilibrium. A kinetic approach using the competing ligand exchange method with Chelex 100 as the competing ligand and inductively coupled plasmamass spectrometry to measure the dissociation kinetics was used to investigate the chemical speciation of Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Pb(II) in model sol...

Journal: :Analytica chimica acta 2007
Frank J Black Kenneth W Bruland A Russell Flegal

A method employing dual competitive ligand exchange followed by solid phase extraction (CLE-SPE) for characterizing the complexation of inorganic Hg(II) in natural waters is described. This method employs parallel use of two competing ligands: diethyldithiolcarbamate (DEDC), which forms hydrophobic complexes with Hg(II), and thiosalicylic acid (TSA), which forms hydrophilic complexes with Hg(II...

2010
Mark B. Bain Emily R. Cornwell Kristine M. Hope Geofrey E. Eckerlin Rufina N. Casey Geoffrey H. Groocock Rodman G. Getchell Paul R. Bowser James R. Winton William N. Batts Allegra Cangelosi James W. Casey

Viral hemorrhagic septicemia virus (VHSV) is a rhabdovirus found in fish from oceans of the northern hemisphere and freshwaters of Europe. It has caused extensive losses of cultured and wild fish and has become established in the North American Great Lakes. Large die-offs of wild fish in the Great Lakes due to VHSV have alarmed the public and provoked government attention on the introduction an...

Journal: :Ecotoxicology 2010
Michiel A Daam Paul J Van den Brink

Despite considerable increased pesticide use over the past decades, little research has been done into their fate and effects in surface waters in tropical regions. In the present review, possible differences in response between temperate and tropical freshwaters to pesticide stress are discussed. Three underlying mechanisms for these differences are distinguished: (1) climate related parameter...

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