Now showing items 3980-3999 of 7131

  • A method for estimating pore water drainage from marsh soils using rainfall and well records 

    Gardner, Leonard Robert; Gaines, Emily F. (2008-03-05)
    Rainfall events during low tide exposure cause the water table in marshes to rise. If one has long time series of both rain events and water levels in wells along transects from creek bank to marsh interior, one can ...
  • A method for inverting ratio–ratio data to estimate end-member compositions in mixing problems 

    Sohn, Robert A. (2013-05-28)
    I discuss the general problem of fitting mixing models to ratio-ratio data, and derive formulae for applying non-linear Maximum Likelihood methods for parameter estimation. To estimate mixing model parameters in the ...
  • Method for reconstructing climate from fossil beetle assemblages 

    Huppert, Amit; Solow, Andrew R. (Royal Society, 2004-04-19)
    Fossil beetle remains have been used to reconstruct temperatures. One method by which these reconstructions are made--the Mutual Climatic Range method--is based on the overlap of the observed modern climatic ranges of the ...
  • A method for selectively enriching microbial DNA from contaminating vertebrate host DNA 

    Feehery, George R.; Yigit, Erbay; Oyola, Samuel O.; Langhorst, Bradley W.; Schmidt, Victor T.; Stewart, Fiona J.; Dimalanta, Eileen T.; Amaral-Zettler, Linda A.; Davis, Theodore; Quail, Michael A.; Pradhan, Sriharsa (Public Library of Science, 2013-10-28)
    DNA samples derived from vertebrate skin, bodily cavities and body fluids contain both host and microbial DNA; the latter often present as a minor component. Consequently, DNA sequencing of a microbiome sample frequently ...
  • A method for studying protistan diversity using massively parallel sequencing of V9 hypervariable regions of small-subunit ribosomal RNA genes 

    Amaral-Zettler, Linda A.; McCliment, Elizabeth A.; Ducklow, Hugh W.; Huse, Susan M. (Public Library of Science, 2009-07-27)
    Massively parallel pyrosequencing of amplicons from the V6 hypervariable regions of small-subunit (SSU) ribosomal RNA (rRNA) genes is commonly used to assess diversity and richness in bacterial and archaeal populations. ...
  • A method for the analysis of rare earth elements in natural waters by isotope dilution mass spectrometry 

    Schneider, David L.; Palmieri, Julianne M. (Woods Hole Oceanographic Institution, 1994-01)
    A method is described to measure rare-earth elements (REE) in natural water samples. An iron hydroxide precipitation followed by ion-exchange chromatography is used to concentrate and separate the REE from other matrix ...
  • Methodology for sampling and analysis of lipids in aerosols from the remote marine atmosphere 

    Peltzer, Edward T.; Alford, Jame B.; Gagosian, Robert B. (Woods Hole Oceanographic Institution, 1984-04)
    A procedure is described for the collection of remote marine aerosol samples by high-volume filtration, cascade impaction, dry fallout collection and rain. Samples were analyzed quantitatively for five classes of naturally ...
  • 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 ...