Now showing items 296-315 of 921

    • Farm management, not soil microbial diversity, controls nutrient loss from smallholder tropical agriculture 

      Wood, Stephen A.; Almaraz, Maya; Bradford, Mark A.; McGuire, Krista L.; Naeem, Shahid; Neill, Christopher; Palm, Cheryl A.; Tully, Katherine L.; Zhou, Jizhong (Frontiers Media, 2015-03-04)
      Tropical smallholder agriculture is undergoing rapid transformation in nutrient cycling pathways as international development efforts strongly promote greater use of mineral fertilizers to increase crop yields. These changes ...
    • Fate of nitrogen in riparian forest soils and trees : an N-15 tracer study simulating salmon decay 

      Drake, Deanne C.; Naiman, Robert J.; Bechtold, J. Scott (2005-05-23)
      We introduced a 15N-NH4+ tracer to the riparian forest of a salmon-bearing stream (Kennedy Creek, Washington, USA) to quantify the cycling and fate of a late-season pulse of salmon-N, and, ultimately, mechanisms regulating ...
    • Fecundity and spawning of the Atlantic horseshoe crab, Limulus polyphemus, in Pleasant Bay, Cape Cod, Massachusetts, USA 

      Leschen, Alison S.; Grady, Sara P.; Valiela, Ivan (2005-09-12)
      This study provided the first comprehensive analysis of Atlantic horseshoe crab (Limulus polyphemus) fecundity. Limulus appear to be determinate spawners, maturing all their eggs for the breeding season before spawning ...
    • A fiber-optic phase-randomizer for microscope illumination by laser 

      Ellis, Gordon W. (Rockefeller University Press, 1979-11)
    • Fiddler on the roof : a northern range extension for the marsh fiddler crab Uca pugnax 

      Johnson, David S. (2014-09)
      A northern range extension is presented here for the marsh fiddler crab Uca pugnax. In summer 2014, adult crabs were found as far north as Hampton, New Hampshire (42.924428, -70.820517), which is 80 km north of its previously ...
    • Flexible and dynamic nucleosome fiber in living mammalian cells 

      Nozaki, Tadasu; Kaizu, Kazunari; Pack, Chan-Gi; Tamura, Sachiko; Tani, Tomomi; Hihara, Saera; Nagai, Takeharu; Takahashi, Koichi; Maeshima, Kazuhiro (Landes Bioscience, 2013-08-12)
      Genomic DNA is organized three dimensionally within cells as chromatin and is searched and read by various proteins by an unknown mechanism; this mediates diverse cell functions. Recently, several pieces of evidence, ...
    • Flow-weighted values of runoff tracers (δ18O, DOC, Ba, alkalinity) from the six largest Arctic rivers 

      Cooper, Lee W.; McClelland, James W.; Holmes, Robert M.; Raymond, Peter A.; Gibson, J. J.; Guay, Christopher K.; Peterson, Bruce J. (American Geophysical Union, 2008-09-20)
      We present new flow-weighted data for δ 18OH2O, dissolved organic carbon (DOC), dissolved barium and total alkalinity from the six largest Arctic rivers: the Ob', Yenisey, Lena, Kolyma, Yukon and Mackenzie. These data, ...
    • Fluid interactions that enable stealth predation by the upstream-foraging hydromedusa Craspedacusta sowerbyi 

      Lucas, K.; Colin, Sean P.; Costello, John H.; Katija, Kakani; Klos, E. (Marine Biological Laboratory, 2013-09-01)
      Unlike most medusae that forage with tentacles trailing behind their bells, several species forage upstream of their bells using aborally located tentacles. It has been hypothesized that these medusae forage as stealth ...
    • Food benefit and climate warming potential of nitrogen fertilizer uses in China 

      Tian, Hanqin; Lu, Chaoqun; Melillo, Jerry M.; Ren, Wei; Huang, Yao; Xu, Xiaofeng; Liu, Mingliang; Zhang, Chi; Chen, Guangsheng; Pan, Shufen; Liu, Jiyuan; Reilly, John M. (IOP Publishing, 2012-10-31)
      Chemical nitrogen (N) fertilizer has long been used to help meet the increasing food demands in China, the top N fertilizer consumer in the world. Growing concerns have been raised on the impacts of N fertilizer uses on ...
    • The footprint of Alaskan tundra fires during the past half-century : implications for surface properties and radiative forcing 

      Rocha, Adrian V.; Loranty, Michael M.; Higuera, Philip E.; Mack, Michelle C.; Hu, Feng Sheng; Jones, Benjamin M.; Breen, Amy L.; Rastetter, Edward B.; Goetz, Scott J.; Shaver, Gaius R. (IOP Publishing, 2012-12-19)
      Recent large and frequent fires above the Alaskan arctic circle have forced a reassessment of the ecological and climatological importance of fire in arctic tundra ecosystems. Here we provide a general overview of the ...
    • Force and length in the mitotic spindle 

      Dumont, Sophie; Mitchison, Timothy J. (2009-07)
      The mitotic spindle assembles to a steady-state length at metaphase through the integrated action of molecular mechanisms that generate and respond to mechanical forces. While molecular mechanisms that produce force have ...
    • Forecasting effects of sea-level rise and windstorms on coastal and inland ecosystems 

      Hopkinson, Charles S.; Lugo, Ariel E.; Alber, Merryl; Covich, Alan P.; Van Bloem, Skip J. (Ecological Society of America, 2008-06)
      We identify a continental-scale network of sites to evaluate how two aspects of climate change – sea-level rise and intensification of windstorms – will influence the structure, function, and capacity of coastal and inland ...
    • Forensic analysis of the microbiome of phones and shoes 

      Lax, Simon; Hampton-Marcell, Jarrad T.; Gibbons, Sean M.; Colares, Georgia Barguil; Smith, Daniel; Eisen, Jonathan A.; Gilbert, Jack A. (BioMed Central, 2015-05-12)
      Microbial interaction between human-associated objects and the environments we inhabit may have forensic implications, and the extent to which microbes are shared between individuals inhabiting the same space may be relevant ...
    • Formation of the statolith in the ctenophore Mnemiopsis leidyi 

      Tamm, Sidney L. (Marine Biological Laboratory, 2014-08-01)
      The aboral sensory organ (apical organ) of ctenophores contains a statocyst with a single large statolith. The statolith comprises living cells (lithocytes), each containing a large membrane-bound concretion. The statolith ...
    • Four-bar linkage modelling in teleost pharyngeal jaws : computer simulations of bite kinetics 

      Grubich, Justin R.; Westneat, Mark W. (2006-01-25)
      The pharyngeal arches of the red drum (Sciaenops ocellatus) possess large toothplates and a complex musculoskeletal design for biting and crushing hard prey. The morphology of pharyngeal apparatus is described from dissections ...
    • A framework for quantifying the magnitude and variability of community responses to global change drivers 

      Avolio, Meghan L.; La Pierre, Kimberly J.; Houseman, Gregory R.; Koerner, Sally E.; Grman, Emily; Isbell, Forest; Johnson, David S.; Wilcox, Kevin R. (John Wiley & Sons, 2015-12-21)
      A major challenge in global change ecology is to predict the trajectory and magnitude of community change in response to global change drivers (GCDs). Here, we present a new framework that not only increases the predictive ...
    • A framework to assess biogeochemical response to ecosystem disturbance using nutrient partitioning ratios 

      Kranabetter, J. Marty; McLauchlan, Kendra K.; Enders, Sara K.; Fraterrigo, Jennifer M.; Higuera, Philip E.; Morris, Jesse L.; Rastetter, Edward B.; Barnes, Rebecca T.; Buma, Brian; Gavin, Daniel; Gerhart, Laci M.; Gillson, Lindsey; Hietz, Peter; Mack, Michelle C.; McNeil, Brenden; Perakis, Steven S. (2015-11)
      Disturbances affect almost all terrestrial ecosystems, but it has been difficult to identify general principles regarding these influences. To improve our understanding of the long-term consequences of disturbance on ...
    • The freshwater system west of the Antarctic Peninsula : spatial and temporal changes 

      Meredith, Michael P.; Venables, Hugh J.; Clarke, Andrew; Ducklow, Hugh W.; Erickson, Matthew; Leng, Melanie J.; Lenaerts, Jan T. M.; van den Broeke, Michiel R. (American Meteorological Society, 2013-03-01)
      Climate change west of the Antarctic Peninsula is the most rapid of anywhere in the Southern Hemisphere, with associated changes in the rates and distributions of freshwater inputs to the ocean. Here, results from the first ...
    • Functional consequences of the asymmetric architecture of the ctenophore statocyst 

      Tamm, Sidney L. (Marine Biological Laboratory, 2015-10-01)
      Ctenophores, or comb jellies, are geotactic with a statocyst that controls the activity of the eight ciliary comb rows. If a ctenophore is tilted or displaced from a position of vertical balance, it rights itself by ...
    • Functional organization of hsp70 cluster in camel (Camelus dromedarius) and other mammals 

      Garbuz, David G.; Astakhova, Lubov N.; Zatsepina, Olga G.; Arkhipova, Irina R.; Nudler, Eugene; Evgenev, Michael B. (Public Library of Science, 2011-11-09)
      Heat shock protein 70 (Hsp70) is a molecular chaperone providing tolerance to heat and other challenges at the cellular and organismal levels. We sequenced a genomic cluster containing three hsp70 family genes linked with ...