Now showing items 245-264 of 890

    • Environmental distribution and persistence of Quahog Parasite Unknown (QPX) 

      Gast, Rebecca J.; Moran, Dawn M.; Audemard, Corinne; Lyons, M. Maille; DeFaveri, Jacquelin; Reece, Kimberly S.; Leavitt, Dale F.; Smolowitz, Roxanna M. (Inter-Research, 2008-09-24)
      Quahog Parasite Unknown (QPX) is the cause of mass mortality events of hard clams Mercenaria mercenaria from Virginia, USA, to New Brunswick, Canada. Aquaculture areas in Massachusetts, USA, have been particularly hard ...
    • The environmental toxicant 2,3,7,8-tetrachlorodibenzo-p-dioxin disrupts morphogenesis of the rat pre-implantation embryo 

      Hutt, Karla J.; Shi, Zhanquan; Albertini, David F.; Petroff, Brian K. (BioMed Central, 2008-01-02)
      Environmental toxicants, whose actions are often mediated through the aryl hydrocarbon receptor (AhR) pathway, pose risks to the health and well-being of exposed species, including humans. Of particular concern are exposures ...
    • ENVIRONMENTS and EOL : identification of Environment Ontology terms in text and the annotation of the Encyclopedia of Life 

      Pafilis, Evangelos; Frankild, Sune P.; Schnetzer, Julia; Fanini, Lucia; Faulwetter, Sarah; Pavloudi, Christina; Vasileiadou, Katerina; Leary, Patrick R.; Hammock, Jennifer; Schulz, Katja; Parr, Cynthia Sims; Arvanitidis, Christos; Jensen, Lars Juhl (Oxford University Press, 2015-01-24)
      The association of organisms to their environments is a key issue in exploring biodiversity patterns. This knowledge has traditionally been scattered, but textual descriptions of taxa and their habitats are now being ...
    • Envisioning a marine biodiversity observation network 

      Duffy, J. Emmett; Amaral-Zettler, Linda A.; Fautin, Daphne G.; Paulay, Gustav; Rynearson, Tatiana A.; Sosik, Heidi M.; Stachowicz, John J. (University of California Press, 2013-05)
      Humans depend on diverse ocean ecosystems for food, jobs, and sustained well-being, yet many stressors threaten marine life. Extensive research has demonstrated that maintaining biodiversity promotes ocean health and service ...
    • Envisioning the future of science libraries at academic research institutions : a discussion 

      Feltes, Carol; Gibson, Donna S.; Miller, Holly; Norton, Cathy N.; Pollock, Ludmila (2012-12-20)
      A group of librarians, other information professionals, scientists and research administrators met to discuss the challenges that research libraries are currently facing. After the meeting a survey was conducted to obtain ...
    • Epigenetic regulation during mammalian oogenesis 

      Bromfield, John; Messamore, Will; Albertini, David F. (2007-09-25)
      The advent of the epigenetic era has sparked a new frontier in molecular research and the understanding of how development can be regulated beyond direct alterations of the genome. Thus far, the focal point of epigenetic ...
    • Episymbiotic microbes as food and defence for marine isopods : unique symbioses in a hostile environment 

      Lindquist, Niels; Barber, Paul H.; Weisz, Jeremy B. (Royal Society, 2005-06-14)
      Symbioses profoundly affect the diversity of life, often through novel biochemical services that symbionts provide to their hosts. These biochemical services are typically nutritional enhancements and less commonly defensive, ...
    • Epizootiology of Quahog Parasite Unknown (QPX) disease in northern quahogs (=hard clams) Mercenaria mercenaria 

      Lyons, M. Maille; Smolowitz, Roxanna M.; Gomez-Chiarri, Marta; Ward, J. Evan (National Shellfisheries Association, 2007-08)
      The economically important marine bivalve mollusc, Mercenaria mercenaria, (commonly called a northern quahog or hard clam), has endured considerable mortalities caused by a thraustochytrid pathogen called Quahog Parasite ...
    • Escherichia coli K-12 : a cooperatively developed annotation snapshot—2005 

      Riley, Monica; Abe, Takashi; Arnaud, Martha B.; Berlyn, Mary K. B.; Blattner, Frederick R.; Chaudhuri, Roy R.; Glasner, Jeremy D.; Horiuchi, Takashi; Keseler, Ingrid M.; Kosuge, Takehide; Mori, Hirotada; Perna, Nicole T.; Plunkett, Guy; Rudd, Kenneth E.; Serres, Margrethe H.; Thomas, Gavin H.; Thomson, Nicholas R.; Wishart, David; Wanner, Barry L. (Oxford University Press, 2006-01-05)
      The goal of this group project has been to coordinate and bring up-to-date information on all genes of Escherichia coli K-12. Annotation of the genome of an organism entails identification of genes, the boundaries of genes ...
    • Estimating uncertainty in ecosystem budget calculations 

      Yanai, Ruth D.; Battles, John J.; Richardson, Andrew D.; Blodgett, Corrie A.; Wood, Dustin M.; Rastetter, Edward B. (Springer, 2010-02-25)
      Ecosystem nutrient budgets often report values for pools and fluxes without any indication of uncertainty, which makes it difficult to evaluate the significance of findings or make comparisons across systems. We present ...
    • Eutrophication in Portuguese estuaries evidenced by δ15N of macrophytes 

      Castro, Paula; Valiela, Ivan; Freitas, Helena (Inter-Research, 2007-12-06)
      Terrestrial inputs of nitrogen in estuaries are increasing and altering salt marsh primary production, plant communities and associated biota. We used N isotope ratios and %N in Spartina maritima, Halimione portulacoides, ...
    • Evaluating remotely sensed phenological metrics in a dynamic ecosystem model 

      Xu, Hong; Twine, Tracy E.; Yang, Xi (MDPI AG, 2014-05-26)
      Vegetation phenology plays an important role in regulating processes of terrestrial ecosystems. Dynamic ecosystem models (DEMs) require representation of phenology to simulate the exchange of matter and energy between the ...
    • Evaluating support for the current classification of eukaryotic diversity 

      Parfrey, Laura Wegener; Barbero, Erika; Lasser, Elyse; Dunthorn, Micah; Bhattacharya, Debashish; Patterson, David J.; Katz, Laura A. (Public Library of Science (PLoS), 2006-12-22)
      Perspectives on the classification of eukaryotic diversity have changed rapidly in recent years, as the four eukaryotic groups within the five-kingdom classification—plants, animals, fungi, and protists—have been transformed ...
    • Evaluation of pyrrolidine and pyrazolone derivatives as inhibitors of trypanosomal phosphodiesterase B1 (TbrPDEB1) 

      Amata, Emanuele; Bland, Nicholas D.; Campbell, Robert K.; Pollastri, Michael P. (2015-04-13)
      Human African trypanosomiasis (HAT) is a parasitic disease, caused by the protozoan pathogen Trypanosoma brucei, which affects thousands every year and which is in need of new therapeutics. Herein we report the synthesis ...
    • Evapotranspiration in Northern Eurasia : impact of forcing uncertainties on terrestrial ecosystem model estimates 

      Liu, Yaling; Zhuang, Qianlai; Miralles, Diego; Pan, Zhihua; Kicklighter, David W.; Zhu, Qing; He, Yujie; Chen, Jiquan; Tchebakova, Nadja M.; Sirin, Andrey; Niyogi, Dev; Melillo, Jerry M. (John Wiley & Sons, 2015-04-03)
      The ecosystems in Northern Eurasia (NE) play an important role in the global water cycle and the climate system. While evapotranspiration (ET) is a critical variable to understand this role, ET over this region remains ...
    • Evidence for biased use of sperm sources in wild female giant cuttlefish (Sepia apama) 

      Naud, Marie-Jose; Shaw, Paul W.; Hanlon, Roger T.; Havenhand, Jon N. (Royal Society, 2005-05-22)
      In species where females store sperm from their mates prior to fertilization, sperm competition is particularly probable. Female Sepia apama are polyandrous and have access to sperm from packages (spermatangia) deposited ...
    • Evidence for lateral transfer of genes encoding ferredoxins, nitroreductases, NADH oxidase, and alcohol dehydrogenase 3 from anaerobic prokaryotes to Giardia lamblia and Entamoeba histolytica 

      Nixon, Julie E. J.; Wang, Amy; Field, Jessica; Morrison, Hilary G.; McArthur, Andrew G.; Sogin, Mitchell L.; Loftus, Brendan J.; Samuelson, John (American Society for Microbiology, 2002-04)
      Giardia lamblia and Entamoeba histolytica are amitochondriate, microaerophilic protists which use fermentation enzymes like those of bacteria to survive anaerobic conditions within the intestinal lumen. Genes encoding ...
    • Evolution by leaps : gene duplication in bacteria 

      Serres, Margrethe H.; Kerr, Alastair R. W.; McCormack, Thomas J.; Riley, Monica (BioMed Central, 2009-11-23)
      Sequence related families of genes and proteins are common in bacterial genomes. In Escherichia coli they constitute over half of the genome. The presence of families and superfamilies of proteins suggest a history of gene ...
    • Evolution of eukaryotic transcription : insights from the genome of Giardia lamblia 

      Best, Aaron A.; Morrison, Hilary G.; McArthur, Andrew G.; Sogin, Mitchell L.; Olsen, Gary J. (Cold Spring Harbor Laboratory Press, 2004)
      The Giardia lamblia genome sequencing project affords us a unique opportunity to conduct comparative analyses of core cellular systems between early and late-diverging eukaryotes on a genome-wide scale. We report a survey ...
    • Evolution of the chordate regeneration blastema : differential gene expression and conserved role of notch signaling during siphon regeneration in the ascidian Ciona 

      Hamada, Mayuko; Goricki, Spela; Byerly, Mardi S.; Satoh, Noriyuki; Jeffery, William R. (2015-06)
      The regeneration of the oral siphon (OS) and other distal structures in the ascidian Ciona intestinalis occurs by epimorphosis involving the formation of a blastema of proliferating cells. Despite the longstanding use of ...