Now showing items 5338-5357 of 8352

    • Nutrient limitation dynamics of a coastal Cape Cod pond : seasonal trends in alkaline phosphatase activity 

      Haupert, Christie L. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2000-11-13)
      A bi-weekly seasonal study was conducted in Ashumet Pond (Cape Cod, Massachusetts). The Redfield Ratio (106C:16N:1P) and alkaline phosphatase activity (APA) were utilized in tandem as nutrient deficiency indicators (NDIs) ...
    • Nutrient limitation of woody debris decomposition in a tropical forest : contrasting effects of N and P addition 

      Chen, Yao; Sayer, Emma J.; Li, Zhian; Mo, Qifeng; Li, Yingwen; Ding, Yongzhen; Wang, Jun; Lu, Xiankai; Tang, Jianwu; Wang, Faming (2015-04)
      Tropical forests represent a major terrestrial store of carbon (C), a large proportion of which is contained in the soil and decaying organic matter. Woody debris plays a key role in forest C dynamics because it contains ...
    • Nutrient supply in the Southern East China Sea after Typhoon Morakot 

      Hung, Chin-Chang; Chung, Chih-Ching; Gong, Gwo-Ching; Jan, Sen; Tsai, Ya-Ling; Chen, Kuo-Shu; Chou, Wen Chen; Lee, Ming-An; Chang, Yi; Chen, Meng-Hsien; Yang, Wen-Rong; Tseng, Chiung-Jung; Gawarkiewicz, Glen G. (Sears Foundation for Marine Research, 2013-01-01)
      Recent studies show that typhoons have profound effects on phytoplankton assemblages along their tracks, but it is difficult to quantitatively estimate nutrient supply after a typhoon's passage due to a lack of nutrient ...
    • Nutrition and income from molluscs today imply vulnerability to ocean acidification tomorrow 

      Cooley, Sarah R.; Lucey, Noelle; Kite-Powell, Hauke L.; Doney, Scott C. (2011-05-20)
      Atmospheric carbon dioxide (CO2) emissions from human industrial activities are causing a progressive alteration of seawater chemistry, termed ocean acidification, that has decreased seawater pH and carbonate ion ...
    • Nutritional ecology of Agalma okeni and other siphonophores from the epipelagic western North Atlantic Ocean 

      Biggs, Douglas C. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1976-05)
      The feeding and fishing behavior of siphonophores in their natural environment: was observed by SCUBA diving at 171 stations in warm-water areas of the Western North Atlantic Ocean. Calycophorae and Physonectae showed ...
    • The nutritional role of endosymbiotic bacteria in animal-bacteria symbioses : Solemya velum, a case study 

      Conway, Noellette M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1990-08)
      The trophie interactions occurring between endosymbiotic bacteria and the host in animal-bacteria symbioses were investigated using the endosymbiont-containing protobranch clam, Solemya velum, as a general model. C, N, ...
    • Obelin mutants as reporters in bioluminescent dual-analyte binding assay 

      Krasitskaya, Vasilisa V.; Kudryavtsev, Alexander N.; Shimomura, Osamu; Frank, Ludmila A. (RSC Publishing, 2012-11-29)
      Two obelin mutants distinctly different in the color of bioluminescence were successfully applied to simultaneous detection of two analytes in a single well. The flash-type signals were triggered by single injection of ...
    • The obese gut microbiome across the epidemiologic transition 

      Dugas, Lara R.; Fuller, Miles; Gilbert, Jack A.; Layden, Brian T. (BioMed Central, 2016-01-11)
      The obesity epidemic has emerged over the past few decades and is thought to be a result of both genetic and environmental factors. A newly identified factor, the gut microbiota, which is a bacterial ecosystem residing ...
    • Objective indicators of pasture degradation from spectral mixture analysis of Landsat imagery 

      Davidson, Eric A.; Asner, Gregory P.; Stone, Thomas A.; Neill, Christopher; Figueiredo, Ricardo O. (American Geophysical Union, 2008-07-23)
      Degradation of cattle pastures is a management concern that influences future land use in Amazonia. However, “degradation” is poorly defined and has different meanings for ranchers, ecologists, and policy makers. Here we ...
    • Objectively analyzed air-sea heat fluxes for the global ice-free oceans (1981-2005) 

      Yu, Lisan; Weller, Robert A. (American Meteorological Society, 2007-04)
      A 25-yr (1981–2005) time series of daily latent and sensible heat fluxes over the global ice-free oceans has been produced by synthesizing surface meteorology obtained from satellite remote sensing and atmospheric model ...
    • The oblique seismic experiment in oceanic crust 

      Stephen, Ralph A. (1978-05)
      The Oblique Seismic Experiment (OSE} is proposed to increase the usefulness of the IPOD crustal borehole as a means of investigating layer 2 of oceanic crust. Specific objectives are: to determine the lateral. extent ...
    • Obliquity pacing of the late Pleistocene glacial terminations 

      Huybers, Peter; Wunsch, Carl (2005-01-24)
      The timing of glacial/interglacial cycles at intervals of about 100,000 yr (100 kyr) is commonly attributed to control by Earth orbital configuration variations. This “pacemaker” hypothesis has inspired many models, variously ...
    • Obliquity-driven expansion of North Atlantic sea ice during the last glacial 

      Turney, Chris S. M.; Thomas, Zoe A.; Hutchinson, David K.; Bradshaw, Corey J. A.; Brook, Barry W.; England, Matthew H.; Fogwill, Christopher J.; Jones, Richard T.; Palmer, Jonathan; Hughen, Konrad A.; Cooper, Alan (John Wiley & Sons, 2015-12-10)
      North Atlantic late Pleistocene climate (60,000 to 11,650 years ago) was characterized by abrupt and extreme millennial duration oscillations known as Dansgaard-Oeschger (D-O) events. However, during the Last Glacial Maximum ...
    • OBSANP data acquisition system : operator's manual and system overview 

      McPeak, Sean P.; D'Spain, Gerald L.; Stephen, Ralph A.; von der Heydt, Keith; Worcester, Peter F. (Woods Hole Oceanographic Institution, 2013-10)
      On the Ocean Bottom Seismometer Augmentation in the North Pacific Experiment (OBSANP, June-July, 2013, R/V Melville), a VLA and twelve OBSs were deployed to listen to an active acoustic source, a J15-3. This report ...
    • OBSAPS data acquisition system : operator's manual and system overview 

      McPeak, Sean P.; D'Spain, Gerald L.; Stephen, Ralph A. (Woods Hole Oceanographic Institution, 2011-05)
      On the Ocean Bottom Seismometer Augmentation to the Philippine Sea Experiment (OBSAPS, April-May, 2011, R/V Revelle), a VLA and six OBSs were deployed to listen to an active acoustic source, a J15-3. This report describes ...
    • Observation and inversion of seismo-acoustic waves in a complex Artic ice environment 

      Miller, Bruce E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1990-09)
      The propagation of low frequency seismo-acoustic waves in the Arctic Ocean ice canopy is examined through the analysis of hydrophone and geophone data sets collected in 1987 at an ice camp designated PRUDEX in the Beaufort ...
    • Observation of near-inertial wave reflections within the thermostad layer of an anticyclonic mesoscale eddy 

      Byun, Sang-Shin; Park, Jong Jin; Chang, Kyung-Il; Schmitt, Raymond W. (American Geophysical Union, 2010-01-15)
      Moored current observations in the southwestern East/Japan Sea of 16.5 months duration clearly captured two episodes of downward phase propagation (upward energy propagation) of near-inertial waves (NIWs). Time series of ...
    • Observation of very large and steep internal waves of elevation near the Massachusetts coast 

      Scotti, Alberto; Pineda, Jesus (American Geophysical Union, 2004-11-25)
      We report on near-bottom waves of elevation with amplitude nearly half the 25 m water column, very steep, and propagating into a sheared turbulent wave-guide. The waves contained trapped cores transporting parcels of water ...
    • Observational and model studies of the circulation in the Gulf of Tonkin, South China Sea 

      Ding, Yang; Chen, Changsheng; Beardsley, Robert C.; Bao, Xianwen; Shi, Maochong; Zhang, Yu; Lai, Zhigang; Li, Ruixiang; Lin, Huichan; Viet, Nguyen Trung (John Wiley & Sons, 2013-12-03)
      Moored current measurements were made at one mooring site in the northern Gulf of Tonkin for about 1 year during 1988–1989. Analyses were performed to examine characteristics and variability of tidal and subtidal flows. ...
    • Observational and theoretical studies of the dynamics of mantle plume–mid-ocean ridge interaction 

      Ito, Garrett T.; Lin, Jian; Graham, David W. (American Geophysical Union, 2003-11-20)
      Hot spot–mid-ocean ridge interactions cause many of the largest structural and chemical anomalies in Earth's ocean basins. Correlated geophysical and geochemical anomalies are widely explained by mantle plumes that deliver ...