Now showing items 1783-1802 of 8791

    • Deeply-towed underwater vehicle systems : a verified analytical procedure for creating parameterized dynamic models 

      Hover, Franz S. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1989-08)
      The dynamics of deeply-towed cable/vehicle systems are governed by nonlinear partial differential equations and as a result, trajectory control is generally difficult using the available techniques. This work examines ...
    • Deepwater overflow through Luzon Strait 

      Qu, Tangdong; Girton, James B.; Whitehead, John A. (American Geophysical Union, 2006-01-10)
      This study examines water property distributions in the deep South China Sea and adjoining Pacific Ocean using all available hydrographic data. Our analysis reveals that below about 1500 m there is a persistent baroclinic ...
    • Defensive responses of cuttlefish to different teleost predators 

      Staudinger, Michelle D.; Buresch, Kendra C.; Mathger, Lydia M.; Fry, Charlie; McAnulty, Sarah; Ulmer, Kimberly M.; Hanlon, Roger T. (Marine Biological Laboratory, 2013-12-01)
      We evaluated cuttlefish (Sepia officinalis) responses to three teleost predators: bluefish (Pomatomus saltatrix), summer flounder (Paralichthys dentatus), and black seabass (Centropristis striata). We hypothesized that the ...
    • Defining a critical period for inhibitory circuits within the somatosensory cortex 

      Lo, Shun Qiang; Sng, Judy C. G.; Augustine, George J. (Nature Publishing Group, 2017-08-04)
      Although experience-dependent changes in brain inhibitory circuits are thought to play a key role during the “critical period” of brain development, the nature and timing of these changes are poorly understood. We examined ...
    • Defining DNA-based operational taxonomic units for microbial-eukaryote ecology 

      Caron, David A.; Countway, Peter D.; Savai, Pratik; Gast, Rebecca J.; Schnetzer, Astrid; Moorthi, Stefanie D.; Dennett, Mark R.; Moran, Dawn M.; Jones, Adriane C. (2009-06-19)
      DNA sequence information has been increasingly used in ecological research on microbial eukaryotes. Sequence-based approaches have included studies of the total diversity of selected ecosystems, the autecology of ...
    • Defining planktonic protist functional groups on mechanisms for energy and nutrient acquisition : incorporation of diverse mixotrophic strategies 

      Mitra, Aditee; Flynn, Kevin J.; Tillmann, Urban; Raven, John A.; Caron, David A.; Stoecker, Diane K.; Not, Fabrice; Hansen, Per J.; Hallegraeff, Gustaaf M.; Sanders, Robert W.; Wilken, Susanne; McManus, George; Johnson, Matthew D.; Pitta, Paraskevi; Våge, Selina; Berge, Terje; Calbet, Albert; Thingstad, Frede; Jeong, Hae Jin; Burkholder, JoAnn M.; Glibert, Patricia M.; Graneli, Edna; Lundgren, Veronica (Elsevier, 2016-01-03)
      Arranging organisms into functional groups aids ecological research by grouping organisms (irrespective of phylogenetic origin) that interact with environmental factors in similar ways. Planktonic protists traditionally ...
    • Defining the ecological and physiological traits of phytoplankton across marine ecosystems 

      Alexander, Harriet (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2016-02)
      Marine phytoplankton are central players in the global carbon cycle, responsible for nearly half of global primary production. The identification of the factors controlling phytoplankton ecology, physiology, and, ultimately, ...
    • Defining the spicity 

      Huang, Rui Xin (Sears Foundation for Marine Research, 2011-07-01)
      Spicity is defined as a thermodynamic variable whose isopleths are 'perpendicular“ to those of density in the (T, S) diagram. A new set of Matlab codes are defined based on the following criteria: First, the isopleths of ...
    • Defining the word “seamount” 

      Staudigel, Hubert; Koppers, Anthony A. P.; Lavelle, J. William; Pitcher, Tony J.; Shank, Timothy M. (Oceanography Society, 2010-03)
      The term seamount has been defined many times (e.g., Menard, 1964; Wessel, 2001; Schmidt and Schmincke, 2000; Pitcher et al., 2007; International Hydrographic Organization, 2008; Wessel et al., 2010) but there is no ...
    • Definitions and sharpness of the extratropical tropopause : a trace gas perspective 

      Pan, L. L.; Randel, W. J.; Gary, B. L.; Mahoney, M. J.; Hintsa, Eric J. (American Geophysical Union, 2004-12-04)
      Definitions of the extratropical tropopause are examined from the perspective of chemical composition. Fine-scale measurements of temperature, ozone, carbon monoxide, and water vapor from approximately 70 aircraft flights, ...
    • Deforestation of watersheds of Panama : nutrient retention and export to streams 

      Valiela, Ivan; Barth-Jensen, Coralie; Stone, Thomas A.; Crusius, John; Fox, Sophia E.; Bartholomew, Megan (Springer, 2013-03-19)
      A series of eight watersheds on the Pacific coast of Panama where conversion of mature lowland wet forest to pastures by artisanal burning provided watershed-scale experimental units with a wide range of forest cover (23, ...
    • Deformation and faulting of subduction overriding plate caused by a subducted seamount 

      Ding, Min; Lin, Jian (John Wiley & Sons, 2016-09-03)
      We conducted numerical experiments to simulate elastoplastic deformation of the overriding plate caused by a subducted seamount. Calculations revealed development of a distinct pair of fault-like shear zones, including a ...
    • Deglacial diatom productivity and surface ocean properties over the Bermuda Rise, northeast Sargasso Sea 

      Gil, Isabelle M.; Keigwin, Lloyd D.; Abrantes, Fatima G. (American Geophysical Union, 2009-12-12)
      Diatom assemblages document surface hydrographic changes over the Bermuda Rise. Between 19.2 and 14.5 ka, subtropical diatom species and Chaetoceros resting spores dominate the flora, as in North Atlantic productive regions ...
    • The deglacial history of surface and intermediate water of the Bering Sea 

      Cook, Mea S.; Keigwin, Lloyd D.; Sancetta, Constance A. (2005-07-31)
      The lithology of deglacial sediments from the Bering Sea includes intervals of laminated or dysaerobic sediments. These intervals are contemporaneous with the occurrence of laminated sediments from the California margin ...
    • Deglacial sea surface temperatures of the western tropical Pacific : a new look at old coral 

      Cohen, Anne L.; Hart, Stanley R. (American Geophysical Union, 2004-12-30)
      Using Secondary Ion Mass Spectrometry (SIMS) ion microprobe techniques, we generated annual Sr/Ca cycles with subweekly resolution from chunks of Porites coral retrieved from a Tahiti barrier reef drill core (149°W, 17°S), ...
    • Deglacial variability in the surface return flow of the Atlantic meridional overturning circulation 

      Came, Rosemarie E.; Oppo, Delia W.; Curry, William B.; Lynch-Stieglitz, Jean (American Geophysical Union, 2008-03-29)
      Benthic foraminiferal Cd/Ca from a Florida Current sediment core documents the history of the northward penetration of southern source waters within the surface return flow of the Atlantic meridional overturning circulation ...
    • Deglacial δ18O and hydrologic variability in the tropical Pacific and Indian Oceans 

      Gibbons, Fern T.; Oppo, Delia W.; Mohtadi, Mahyar; Rosenthal, Yair; Cheng, Jun; Liu, Zhengyu; Linsley, Braddock K. (Elsevier, 2013-11)
      Evidence from geologic archives suggests that there were large changes in the tropical hydrologic cycle associated with the two prominent northern hemisphere deglacial cooling events, Heinrich Stadial 1 (HS1; ∼19 to 15 kyr ...
    • Delayed baroclinic response of the Antarctic circumpolar current to surface wind stress 

      Yang, Xiao-Yi; Huang, Rui Xin; Wang, Jia; Wang, Dong Xiao (2008-01-11)
      Antarctic Circumpolar Current (ACC) responds to the surface windstress via two processes, i.e., instant barotropic process and delayed baroclinic process. This study focuses on the baroclinic instability mechanism in ACC. ...
    • Delayed effects of developmental exposure to low levels of the aryl hydrocarbon receptor agonist 3,3′,4,4′,5-pentachlorobiphenyl (PCB126) on adult zebrafish behavior 

      Glazer, Lilah; Hahn, Mark E.; Aluru, Neelakanteswar (2015-11)
      Polychlorinated biphenyls (PCBs) are ubiquitous environmental contaminants. The most toxic PCBs are the non-ortho-substituted ("dioxin-like") congeners that act through the aryl hydrocarbon receptor (AHR) pathway. In humans, ...
    • Demersal fish assemblages on seamounts and other rugged features in the northeastern Caribbean 

      Quattrini, Andrea M.; Demopoulos, Amanda W. J.; Singer, Randal; Roa-Varon, Adela; Chaytor, Jason D. (2017-03)
      Recent investigations of demersal fish communities in deepwater (>50 m) habitats have considerably increased our knowledge of the factors that influence the assemblage structure of fishes across mesophotic to deep-sea ...