Now showing items 452-471 of 902

    • Limnology of tundra ponds, Barrow, Alaska 

      Hobbie, John E. (Dowden, Hutchinson & Ross, 1980)
      This book is a report of investigations of several small ponds on the arctic tundra near Barrow, Alaska. The main study, which ran from 1971 through 1973, was funded from three sources: The National Science Foundation, ...
    • Linkages among runoff, dissolved organic carbon, and the stable oxygen isotope composition of seawater and other water mass indicators in the Arctic Ocean 

      Cooper, Lee W.; Benner, Ronald; McClelland, James W.; Peterson, Bruce J.; Holmes, Robert M.; Raymond, Peter A.; Hansell, Dennis A.; Grebmeier, Jacqueline M.; Codispoti, Louis A. (American Geophysical Union, 2005-12-07)
      Concentrations of dissolved organic carbon (DOC) and δ18O values have been determined following sampling of runoff from a number of major arctic rivers, including the Ob, Yenisey, Lena, Kolyma, Mackenzie and Yukon in ...
    • Linking ecology and economics for ecosystem management 

      Farber, Stephen; Costanza, Robert; Childers, Daniel L.; Erickson, Jon; Gross, Katherine; Grove, J. Morgan; Hopkinson, Charles S.; Kahn, James; Pincetl, Stephanie; Troy, Austin; Warren, Paige; Wilson, Matthew (American Institute of Biological Sciences, 2006-02)
      This article outlines an approach, based on ecosystem services, for assessing the trade-offs inherent in managing humans embedded in ecological systems. Evaluating these trade-offs requires an understanding of the biophysical ...
    • Live-cell imaging RNAi screen identifies PP2A–B55α and importin-β1 as key mitotic exit regulators in human cells 

      Schmitz, Michael H. A.; Held, Michael; Janssens, Veerle; Hutchins, James R. A.; Hudecz, Otto; Ivanova, Elitsa; Goris, Jozef; Trinkle-Mulcahy, Laura; Lamond, Angus I.; Poser, Ina; Hyman, Anthony A.; Mechtler, Karl; Peters, Jan-Michael; Gerlich, Daniel W. (2010-07)
      When vertebrate cells exit mitosis, they reorganize various cellular structures to build functional interphase cells1. This depends on Cdk1 inactivation and subsequent dephosphorylation of its substrates2-4. Members of ...
    • Long serial analysis of gene expression for gene discovery and transcriptome profiling in the widespread marine coccolithophore Emiliania huxleyi 

      Dyhrman, Sonya T.; Haley, Sheean T.; Birkeland, Shanda R.; Wurch, Louie L.; Cipriano, Michael J.; McArthur, Andrew G. (American Society for Microbiology, 2006-01)
      The abundant and widespread coccolithophore Emiliania huxleyi plays an important role in mediating CO2 exchange between the ocean and the atmosphere through its impact on marine photosynthesis and calcification. Here, we ...
    • Long-term biological effects of petroleum residues on fiddler crabs in salt marshes 

      Culbertson, Jennifer B.; Valiela, Ivan; Peacock, Emily E.; Reddy, Christopher M.; Carter, Anna; VanderKruik, Rachel (2007)
      In September 1969,the Florida barge spilled 700,000 L of No. 2 fuel oil into the salt marsh sediments of Wild Harbor (Buzzards Bay, MA). Today the aboveground environment appears unaffected, but a substantial amount of ...
    • Long-term CO2 enrichment of a forest ecosystem : implications for forest regeneration and succession 

      Mohan, Jacqueline E.; Clark, James S.; Schlesinger, William H. (Ecological Society of America, 2007-06)
      The composition and successional status of a forest affect carbon storage and net ecosystem productivity, yet it remains unclear whether elevated atmospheric carbon dioxide (CO2) will impact rates and trajectories of forest ...
    • Long-term ecological research in a human-dominated world 

      Robertson, G. Philip; Collins, Scott L.; Foster, David R.; Brokaw, Nicholas; Ducklow, Hugh W.; Gragson, Ted L.; Gries, Corinna; Hamilton, Stephen K.; McGuire, A. David; Moore, John C.; Stanley, Emily H.; Waide, Robert B.; Williams, Mark W. (American Institute of Biological Sciences, 2012-04)
      The US Long Term Ecological Research (LTER) Network enters its fourth decade with a distinguished record of achievement in ecological science. The value of long-term observations and experiments has never been more important ...
    • Long-term experimental warming and nutrient additions increase productivity in tall deciduous shrub tundra 

      DeMarco, Jennie; Mack, Michelle C.; Bret-Harte, M. Syndonia; Burton, Mark; Shaver, Gaius R. (Ecological Society of America, 2014-06-19)
      Warming Arctic temperatures can drive changes in vegetation structure and function directly by stimulating plant growth or indirectly by stimulating microbial decomposition of organic matter and releasing more nutrients ...
    • Long-term forest soil warming alters microbial communities in temperate forest soils 

      DeAngelis, Kristen M.; Pold, Grace; Topcuoglu, Begum D.; van Diepen, Linda T. A.; Varney, Rebecca M.; Blanchard, Jeffrey L.; Melillo, Jerry M.; Frey, Serita D. (Frontiers Media, 2015-02-13)
      Soil microbes are major drivers of soil carbon cycling, yet we lack an understanding of how climate warming will affect microbial communities. Three ongoing field studies at the Harvard Forest Long-term Ecological Research ...
    • Long-term studies of the marine ecosystem along the west Antarctic Peninsula 

      Ducklow, Hugh W. (2008-06-27)
      Articles in this volume focus on longer-term studies of the marine ecosystem of the continental shelf west of the Antarctic Peninsula, principally by the Palmer, Antarctica Long- Term Ecological Research project (Ross ...
    • Long-term survival of adult Arctic grayling (Thymallus arcticus) in the Kuparuk River, Alaska 

      Buzby, Karen M.; Deegan, Linda A. (National Research Council Canada, 2004-12-23)
      In many long-lived species such as Arctic grayling (Thymallus arcticus), population growth rate is most sensitive to changes in adult survival probabilities. Understanding the factors that regulate adult survival in this ...
    • Looking deeper into the soil : biophysical controls and seasonal lags of soil CO2 production and efflux 

      Vargas, Rodrigo; Baldocchi, Dennis D.; Allen, Michael F.; Bahn, Michael; Black, T. Andrew; Collins, Scott L.; Yuste, Jorge Curiel; Hirano, Takashi; Jassal, Rachhpal S.; Pumpanen, Jukka; Tang, Jianwu (Ecological Society of America, 2010-09)
      We seek to understand how biophysical factors such as soil temperature (Ts), soil moisture (θ), and gross primary production (GPP) influence CO2 fluxes across terrestrial ecosystems. Recent advancements in automated ...
    • Low-dose arsenic compromises the immune response to influenza A infection in vivo 

      Kozul, Courtney D.; Ely, Kenneth H.; Enelow, Richard I.; Hamilton, Joshua W. (National Institute of Environmental Health Sciences, 2009-05-20)
      Arsenic exposure is a significant worldwide environmental health concern. We recently reported that 5-week exposure to environmentally relevant levels (10 and 100 ppb) of As in drinking water significantly altered components ...
    • Macroalgal responses to experimental nutrient enrichment in shallow coastal waters : growth, internal nutrient pools, and isotopic signatures 

      Teichberg, Mirta; Fox, Sophia E.; Aguila, Carolina; Olsen, Ylva S.; Valiela, Ivan (Inter-Research, 2008-09-25)
      Increased nutrient inputs to temperate coastal waters have led to increased occurrences of macroalgal blooms worldwide. To identify nutrients that are limiting to macroalgae and to determine whether different forms of these ...
    • Macrophyte abundance in Waquoit Bay : effects of land-derived nitrogen loads on seasonal and multi-year biomass patterns 

      Fox, Sophia E.; Stieve, Erica; Valiela, Ivan; Hauxwell, Jennifer; McClelland, James W. (2008-01)
      Anthropogenic inputs of nutrients to coastal waters have rapidly restructured coastal ecosystems. To examine the response of macrophyte communities to land-derived nitrogen loading, we measured macrophyte biomass monthly ...
    • Macrophytes as indicators of land-derived wastewater : application of a δ15N method in aquatic systems 

      Cole, Marci L.; Kroeger, Kevin D.; McClelland, James W.; Valiela, Ivan (American Geophysical Union, 2005-01-25)
      We measured δ15N signatures of macrophytes and particulate organic matter (POM) in six estuaries and three freshwater ponds of Massachusetts to assess whether the signatures could be used as indicators of the magnitude of ...
    • Maloriented bivalents have metaphase positions at the spindle equator with more kinetochore microtubules to one pole than to the other 

      LaFountain, James R.; Oldenbourg, Rudolf (American Society for Cell Biology, 2004-09-22)
      To test the "traction fiber" model for metaphase positioning of bivalents during meiosis, kinetochore fibers of maloriented bivalents, induced during recovery from cold arrest, were analyzed with a liquid crystal polarizing ...
    • Mammalian end binding proteins control persistent microtubule growth 

      Komarova, Yulia A.; De Groot, Christian O.; Grigoriev, Ilya; Gouveia, Susana Montenegro; Munteanu, E. Laura; Schober, Joseph M.; Honnappa, Srinivas; Buey, Ruben M.; Hoogenraad, Casper C.; Dogterom, Marileen; Borisy, Gary G.; Steinmetz, Michel O.; Akhmanova, Anna (Rockefeller University Press, 2009-03-02)
      End binding proteins (EBs) are highly conserved core components of microtubule plus-end tracking protein networks. Here we investigated the roles of the three mammalian EBs in controlling microtubule dynamics and analyzed ...
    • Mapping the biosphere : exploring species to understand the origin, organization and sustainability of biodiversity 

      Wheeler, Q. D.; Knapp, Sandra; Stevenson, D. W.; Stevenson, J.; Blum, Stan D.; Boom, B.. M.; Borisy, Gary G.; Buizer, J. L.; De Carvalho, M. R.; Cibrian, A.; Donoghue, M. J.; Doyle, V.; Gerson, E. M.; Graham, C. H.; Graves, P.; Graves, Sara J.; Guralnick, Robert P.; Hamilton, A. L.; Hanken, J.; Law, W.; Lipscomb, D. L.; Lovejoy, T. E.; Miller, Holly; Miller, J. S.; Naeem, Shahid; Novacek, M. J.; Page, L. M.; Platnick, N. I.; Porter-Morgan, H.; Raven, Peter H.; Solis, M. A.; Valdecasas, A. G.; Van Der Leeuw, S.; Vasco, A.; Vermeulen, N.; Vogel, J.; Walls, R. L.; Wilson, E. O.; Woolley, J. B. (Taylor & Francis, 2012-03-27)
      The time is ripe for a comprehensive mission to explore and document Earth's species. This calls for a campaign to educate and inspire the next generation of professional and citizen species explorers, investments in ...