Now showing items 4346-4365 of 7809

    • 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. Geoffrey (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 associations with macrobiota in coastal ecosystems : patterns and implications for nitrogen cycling 

      Moulton, Orissa M.; Altabet, Mark; Beman, J. Michael; Deegan, Linda A.; Lloret, Javier; Lyons, Meaghan K.; Nelson, James A.; Pfister, Catherine (John Wiley & Sons, 2016-05-02)
      In addition to their important effects on nitrogen (N) cycling via excretion and assimilation (by macrofauna and macroflora, respectively), many macrobiota also host or facilitate microbial taxa responsible for N ...
    • 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 cycling of marine high molecular weight dissolved organic matter 

      Sosa, Oscar A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2016-06)
      Microorganisms play a central role mediating biogeochemical cycles in the ocean. Marine dissolved organic matter (DOM) – a reservoir of organic solutes and colloids derived from plankton is a major source of carbon, ...
    • Microbial diversity - exploration of natural ecosystems and microbiomes 

      Gibbons, Sean M.; Gilbert, Jack A. (2015-09-29)
      Microorganisms are the pillars of life on Earth. Over billions of years, they have evolved into every conceivable niche on the planet. Microbes reshaped the oceans and atmosphere and gave rise to conditions conducive to ...
    • 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, ...