Now showing items 4026-4045 of 7203

  • Methods for measuring denitrification : diverse approaches to a difficult problem 

    Groffman, Peter M.; Altabet, Mark A.; Bohlke, John K.; Butterbach-Bahl, Klaus; David, Mark B.; Firestone, Mary K.; Giblin, Anne E.; Kana, Todd M.; Nielsen, Lars Peter; Voytek, Mary A. (2005-07-15)
    Denitrification, the reduction of the nitrogen (N) oxides, nitrate (NO3-) and nitrite (NO2-), to the gases nitric oxide (NO), nitrous oxide (N2O) and dinitrogen (N2), is important to primary production, water quality and ...
  • Methods for obtaining and handling marine eggs and embryos 

    Costello, Donald P.; Henley, Catherine (Marine Biological Laboratory, 1971)
    From the Preface: The Introduction to the first edition of this book (1957) (see page viii) stated that the volume was admittedly incomplete, and that new methods for obtaining, handling and studying marine eggs and ...
  • Methods for the sampling and analysis of marine aerosols : results from the 2008 GEOTRACES aerosol intercalibration experiment 

    Morton, Peter L.; Landing, William M.; Hsu, Shih-Chieh; Milne, Angela; Aguilar-Islas, Ana M.; Baker, Alexander R.; Bowie, Andrew R.; Buck, Clifton S.; Gao, Yuan; Gichuki, Susan; Hastings, Meredith G.; Hatta, Mariko; Johansen, Anne M.; Losno, Remi; Mead, Chris; Patey, Matthew D.; Swarr, Gretchen J.; Vandermark, Amanda; Zamora, Lauren M. (Association for the Sciences of Limnology and Oceanography, 2013-02)
    Atmospheric deposition of trace elements and isotopes (TEI) is an important source of trace metals to the open ocean, impacting TEI budgets and distributions, stimulating oceanic primary productivity, and influencing ...
  • Methyl mercury dynamics in a tidal wetland quantified using in situ optical measurements 

    Bergamaschi, Brian A.; Fleck, Jacob A.; Downing, Bryan D.; Boss, Emmanuel S.; Pellerin, Brian A.; Ganju, Neil K.; Schoellhamer, David H.; Byington, Amy A.; Heim, Wesley A.; Stephenson, Mark; Fujii, Roger (Association for the Sciences of Limnology and Oceanography, 2011-07)
    We assessed monomethylmercury (MeHg) dynamics in a tidal wetland over three seasons using a novel method that employs a combination of in situ optical measurements as concentration proxies. MeHg concentrations measured ...
  • Methylmercury cycling in sediments on the continental shelf of southern New England 

    Hammerschmidt, Chad R.; Fitzgerald, William F. (2005-10-26)
    Exposure of humans to monomethylmercury (MMHg) occurs primarily through consumption of marine fish, yet there is limited understanding concerning the bioaccumulation and biogeochemistry of MMHg in the biologically productive ...
  • Methylmercury in marine ecosystems : spatial patterns and processes of production, bioaccumulation, and biomagnification 

    Chen, Celia; Amirbahman, Aria; Fisher, Nicholas S.; Harding, Gareth; Lamborg, Carl H.; Nacci, Diane E.; Taylor, David (2008-09-30)
    The spatial variation of MeHg production, bioaccumulation and biomagnification in marine food webs is poorly characterized but critical to understanding the links between sources and higher trophic levels such as fish ...
  • Metrics of hurricane-ocean interaction : vertically-integrated or vertically-averaged ocean temperature? 

    Price, James F. (Copernicus Publications on behalf of the European Geosciences Union, 2009-05-05)
    The ocean thermal field is often represented in hurricane-ocean interaction by a metric termed upper Ocean Heat Content (OHC), the vertical integral of ocean temperature in excess of 26°C. High values of OHC have proven ...
  • Microarray analysis of Xenopus endoderm expressing Ptf1a 

    Bilogan, Cassandra K.; Horb, Marko E. (2012-07)
    Pancreas specific transcription factor 1a (Ptf1a), a bHLH transcription factor, has two temporally distinct functions during pancreas development; initially it is required for early specification of the entire pancreas, ...
  • Microbes and the marine phosphorus cycle 

    Dyhrman, Sonya T.; Ammerman, James W.; Van Mooy, Benjamin A. S. (Oceanography Society, 2007-06)
    Phosphorus (P) is fundamental to life, and years of study in marine systems have built a broad understanding of the marine P cycle. Various aspects of marine P biogeochemistry have been reviewed previously ...
  • Microbes in beach sands : integrating environment, ecology and public health 

    Whitman, Richard L.; Harwood, Valerie J.; Edge, Thomas A.; Nevers, Meredith B.; Byappanahalli, Muruleedhara; Vijayavel, Kannappan; Brandao, Joao; Sadowsky, Michael J.; Alm, Elizabeth Wheeler; Crowe, Allan; Ferguson, Donna; Ge, Zhongfu; Halliday, Elizabeth; Kinzelman, Julie; Kleinheinz, Greg; Przybyla-Kelly, Kasia; Staley, Christopher; Staley, Zachery; Solo-Gabriele, Helena M. (2014-05)
    Beach sand is a habitat that supports many microbes, including viruses, bacteria, fungi and protozoa (micropsammon). The apparently inhospitable conditions of beach sand environments belie the thriving communities found ...
  • Microbes in nature are limited by carbon and energy : the starving-survival lifestyle in soil and consequences for estimating microbial rates 

    Hobbie, John E.; Hobbie, Erik A. (Frontiers Media, 2013-11-12)
    Understanding microbial transformations in soils is important for predicting future carbon sequestration and nutrient cycling. This review questions some methods of assessing one key microbial process, the uptake of labile ...
  • Microbes in the coral holobiont : partners through evolution, development, and ecological interactions 

    Thompson, Janelle R.; Rivera, Hanny E.; Closek, Collin J.; Medina, Monica (Frontiers Media, 2015-01-07)
    In the last two decades, genetic and genomic studies have revealed the astonishing diversity and ubiquity of microorganisms. Emergence and expansion of the human microbiome project has reshaped our thinking about how ...
  • Microbial activity in the marine deep biosphere : progress and prospects 

    Orcutt, Beth N.; LaRowe, Douglas E.; Biddle, Jennifer F.; Colwell, Frederick S.; Glazer, Brian T.; Kiel Reese, Brandi; Kirkpatrick, John B.; Lapham, Laura L.; Mills, Heath J.; Sylvan, Jason B.; Wankel, Scott D.; Wheat, C. Geoff (Frontiers Media, 2013-07-11)
    The vast marine deep biosphere consists of microbial habitats within sediment, pore waters, upper basaltic crust and the fluids that circulate throughout it. A wide range of temperature, pressure, pH, and electron donor ...
  • Microbial biogeography along an estuarine salinity gradient : combined influences of bacterial growth and residence time 

    Crump, Byron C.; Hopkinson, Charles S.; Sogin, Mitchell L.; Hobbie, John E. (American Society for Microbiology, 2004-03)
    Shifts in bacterioplankton community composition along the salinity gradient of the Parker River estuary and Plum Island Sound, in northeastern Massachusetts, were related to residence time and bacterial community doubling ...
  • Microbial community composition in sediments resists perturbation by nutrient enrichment 

    Bowen, Jennifer L.; Ward, Bess B.; Morrison, Hilary G.; Hobbie, John E.; Valiela, Ivan; Deegan, Linda A.; Sogin, Mitchell L. (2010-11)
    Functional redundancy in bacterial communities is expected to allow microbial assemblages to survive perturbation by allowing continuity in function despite compositional changes in communities. Recent evidence suggests, ...
  • Microbial diversity and community structure across environmental gradients in Bransfield Strait, Western Antarctic Peninsula 

    Signori, Camila N.; Thomas, Francois; Enrich-Prast, Alex; Pollery, Ricardo C. G.; Sievert, Stefan M. (Frontiers Media, 2014-12-16)
    The Southern Ocean is currently subject to intense investigations, mainly related to its importance for global biogeochemical cycles and its alarming rate of warming in response to climate change. Microbes play an essential ...
  • Microbial diversity and methanogenic activity of Antrim Shale formation waters from recently fractured wells 

    Wuchter, Cornelia; Banning, Erin C.; Mincer, Tracy J.; Drenzek, Nicholas J.; Coolen, Marco J. L. (Frontiers Media, 2013-12-06)
    The Antrim Shale in the Michigan Basin is one of the most productive shale gas formations in the U.S., but optimal resource recovery strategies must rely on a thorough understanding of the complex biogeochemical, microbial, ...
  • Microbial diversity and potential pathogens in onamental fish aquarium water 

    Smith, Katherine F.; Schmidt, Victor T.; Rosen, Gail E.; Amaral-Zettler, Linda A. (Public Library of Science, 2012-09-06)
    Ornamental fishes are among the most popular and fastest growing categories of pets in the United States (U.S.). The global scope and scale of the ornamental fish trade and growing popularity of pet fish in the U.S. are ...
  • Microbial diversity of hydrothermal sediments in the Guaymas Basin : evidence for anaerobic methanotrophic communities 

    Teske, Andreas; Hinrichs, Kai-Uwe; Edgcomb, Virginia P.; de Vera Gomez, Alvin; Kysela, David; Sylva, Sean P.; Sogin, Mitchell L.; Jannasch, Holger W. (American Society for Microbiology, 2002-04)
    Microbial communities in hydrothermally active sediments of the Guaymas Basin (Gulf of California, Mexico) were studied by using 16S rRNA sequencing and carbon isotopic analysis of archaeal and bacterial lipids. The Guaymas ...
  • Microbial eukaryote diversity in the marine oxygen minimum zone off northern Chile 

    Parris, Darren J.; Ganesh, Sangita; Edgcomb, Virginia P.; DeLong, Edward F.; Stewart, Frank J. (Frontiers Media, 2014-10-28)
    Molecular surveys are revealing diverse eukaryotic assemblages in oxygen-limited ocean waters. These communities may play pivotal ecological roles through autotrophy, feeding, and a wide range of symbiotic associations ...