Now showing items 1943-1962 of 8790

    • Developments in radiocarbon technologies : from the Libby counter to compound-specific AMS analyses 

      Povinec, Pavel P.; Litherland, A. E.; von Reden, Karl F. (Dept. of Geosciences, University of Arizona, 2009-05)
      We review developments in radiocarbon measuring techniques from the Libby counter through proportional gas counters and liquid scintillation spectrometers to the more recent developments of accelerator mass spectrometry ...
    • DeZoZoo Cruise Data 

      Pierson, James J.; Decker, Mary Beth (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2017-04-20)
      These data represent the gelatinous zooplankton counts and abundance from the samples collected with Tucker Trawl tows from the DeZoZoo project. For a complete list of measurements, refer to the supplemental document ...
    • DeZoZoo CTD Data 

      Pierson, James J. (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2017-04-20)
      These data present the processed CTD data from the DeZoZoo project taken from the mesohaline portion of Chesapeake Bay from 37.5 - 38.5 degrees N and from 76 - 76.5 degrees West. For a complete list of measurements, refer ...
    • DGGE-based detection method for Quahog Parasite Unknown (QPX) 

      Gast, Rebecca J.; Cushman, E.; Moran, Dawn M.; Uhlinger, Kevin R.; Leavitt, Dale F.; Smolowitz, Roxanna M. (Inter-Research, 2006-06-12)
      Quahog Parasite Unknown (QPX) is a significant cause of hard clam Mercenaria mercenaria mortality along the northeast coast of the United States. It infects both wild and cultured clams, often annually in plots that are ...
    • Diagenetic and detrital origin of moretane anomalies through the Permian–Triassic boundary 

      French, Katherine L.; Tosca, Nicholas J.; Cao, Changqun; Summons, Roger E. (2011-11-22)
      Many biogeochemical anomalies coincide with the Late 1 Permian Extinction (LPE; 252.28 Ma). Several mechanisms have been proposed to explain the moretane/hopane anomaly that has been identified in samples from Meishan ...
    • Diagnosing the warming of the Northeastern U.S. Coastal Ocean in 2012 : a linkage between the atmospheric jet stream variability and ocean response 

      Chen, Ke; Gawarkiewicz, Glen G.; Lentz, Steven J.; Bane, John M. (John Wiley & Sons, 2014-01-13)
      The temperature in the coastal ocean off the northeastern U.S. during the first half of 2012 was anomalously warm, and this resulted in major impacts on the marine ecosystem and commercial fisheries. Understanding the ...
    • Diagnosis of physical and biological controls on phytoplankton distribution in the Gulf of Maine-Georges Bank region 

      Wang, Caixia (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1999-06)
      The linkage between physics and biology is studied by applying a one-dimensional model and a two-dimensional model to the Sargasso Sea and the Gulf of Maine- Georges Bank region, respectively. The first model investigates ...
    • Diapirs as the source of the sediment signature in arc lavas 

      Behn, Mark D.; Kelemen, Peter B.; Hirth, Greg; Hacker, Bradley R.; Massonne, Hans-Joachim (2011-05-31)
      Many arc lavas show evidence for the involvement of subducted sediment in the melting process. There is debate whether this “sediment melt” signature forms at relatively low temperature near the fluid-saturated solidus or ...
    • Diapycnal advection by double diffusion and turbulence in the ocean 

      St. Laurent, Louis C. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1999-09)
      Observations of diapycnal mixing rates are examined and related to diapycnal advection for both double-diffusive and turbulent regimes. The role of double-diffusive mixing at the site of the North Atlantic Tracer ...
    • Diapycnal diffusivities from a tracer release experiment in the deep sea, integrated over 13 years 

      Rye, Craig D.; Messias, Marie-Jose; Ledwell, James R.; Watson, Andrew J.; Brousseau, Andrew; King, Brian A. (American Geophysical Union, 2012-02-21)
      A section across the Atlantic at 24°S recorded in March 2009, sampled a tracer plume released in the deep Brazil Basin 13 years earlier. The 1-D diffusion equation was used to model the vertical spread of the tracer, ...
    • Diapycnal mixing in the Antarctic Circumpolar Current 

      Ledwell, James R.; St. Laurent, Louis C.; Girton, James B.; Toole, John M. (American Meteorological Society, 2011-01)
      The vertical dispersion of a tracer released on a density surface near 1500-m depth in the Antarctic Circumpolar Current west of Drake Passage indicates that the diapycnal diffusivity, averaged over 1 yr and over tens of ...
    • Diatom silicon isotopes as a proxy for silicic acid utilisation : a Southern Ocean core top calibration 

      Egan, Katherine E.; Rickaby, Rosalind E. M.; Leng, Melanie J.; Hendry, Katharine R.; Hermoso, Michael; Sloane, Hilary J.; Bostock, Helen; Halliday, Alex N. (Elsevier, 2012-08-11)
      Despite a growing body of work that uses diatom δ30Si to reconstruct past changes in silicic acid utilisation, few studies have focused on calibrating core top data with modern oceanographic conditions. In this study, a ...
    • Diatoms favor their younger daughters 

      Laney, Samuel R.; Olson, Robert J.; Sosik, Heidi M. (Association for the Sciences of Limnology and Oceanography, 2012-09)
      We used a time-lapse imaging approach to examine cell division in the marine centric diatom Ditylum brightwellii and observed that daughter cells who inherited their parents' hypothecal frustule half were more likely to ...
    • Did an ancient chlamydial endosymbiosis facilitate the establishment of primary plastids? 

      Huang, Jinling; Gogarten, Johann Peter (BioMed Central, 2007-06-04)
      Ancient endosymbioses are responsible for the origins of mitochondria and plastids, and they contribute to the divergence of several major eukaryotic groups. Although chlamydiae, a group of obligate intracellular bacteria, ...
    • Did North Atlantic overturning halt 17,000 years ago? 

      Keigwin, Lloyd D.; Boyle, Edward A. (American Geophysical Union, 2008-01-31)
      Models indicate that a complete shutdown of deep and intermediate water production is a possible consequence of extreme climate conditions in the northern North Atlantic, and the high ratio of 231Pa to 230Th on Bermuda ...
    • Diel changes in humpback whale Megaptera novaeangliae feeding behavior in response to sand lance Ammodytes spp. behavior and distribution 

      Friedlaender, Ari S.; Hazen, Elliott L.; Nowacek, Douglas P.; Halpin, Patrick N.; Ware, Colin; Weinrich, Mason T.; Hurst, Thomas P.; Wiley, David N. (Inter-Research, 2009-12-03)
      Humpback whales Megaptera novaeangliae have adopted unique feeding strategies to take advantage of behavioral changes in their prey. However, logistical constraints have largely limited ecological analyses of these ...
    • Diel plant water use and competitive soil cation exchange interact to enhance NH4+ and K+ availability in the rhizosphere 

      Espeleta, Javier F.; Cardon, Zoe G.; Mayer, K. Ulrich; Neumann, Rebecca B. (Springer, 2016-11-12)
      Hydro-biogeochemical processes in the rhizosphere regulate nutrient and water availability, and thus ecosystem productivity. We hypothesized that two such processes often neglected in rhizosphere models — diel plant water ...
    • Dielectrophoretic assembly of insulinoma cells and fluorescent nanosensors into three-dimensional pseudo-islet constructs 

      Pethig, Ronald; Menachery, Anoop; Heart, E.; Sanger, R. H.; Smith, Peter J. S. (2007-11-14)
      Dielectrophoretic forces, generated by radio-frequency voltages applied to micromachined, transparent, indium tin oxide electrodes, have been used to condense suspensions of insulinoma cells (BETA-TC-6 and INS-1) into a ...
    • Dielectrophoretic tweezer for isolating and manipulating target cells 

      Menachery, Anoop; Graham, David M.; Messerli, Shanta M.; Pethig, Ronald; Smith, Peter J. S. (2010-06-03)
      The ability to isolate and accurately position single cells in three dimensions is becoming increasingly important in many areas of biological research. We describe the design, theoretical modeling and testing of a novel ...