Now showing items 148-167 of 227

    • Modeling the structure of the ribosome 

      Easterwood, Thomas R.; Harvey, Stephen C. (Georgia Institute of TechnologyNRC Research Press, 1995-12-01)
      Considering the size and complexity of the ribosome and the growing body of data from a wide range of experiments on ribosomal structure, it is becoming increasingly important to develop tools that facilitate the development ...
    • Multiple independent evolutionary solutions to core histone gene regulation 

      Mariño-Ramírez, Leonardo; Jordan, I. King; Landsman, David (Georgia Institute of TechnologyBioMed Central, 2006-12-21)
      Background: Core histone genes are periodically expressed along the cell cycle and peak during S phase. Core histone gene expression is deeply evolutionarily conserved from the yeast Saccharomyces cerevisiae to human. ...
    • Mutations of Different Molecular Origins Exhibit Contrasting Patterns of Regional Substitution Rate Variation 

      Elango, Navin; Kim, Seong-Ho; Vigoda, Eric; Yi, Soojin V. (Georgia Institute of TechnologyPublic Library of Science, 2008-02-29)
      Transitions at CpG dinucleotides, referred to as “CpG substitutions”, are a major mutational input into vertebrate genomes and a leading cause of human genetic disease. The prevalence of CpG substitutions is due to their ...
    • Mutualism and coral persistence: the role of herbivore resistance to algal chemical defense 

      Stachowicz, John J.; Hay, Mark E. (Georgia Institute of TechnologyEcological Society of America, 1999-09)
      Because seaweeds uncontrolled by herbivores can overgrow and kill corals, competition can exclude corals from temperate latitudes where herbivores generally fail to control seaweed biomass. In this study, we show that the ...
    • Mutualism between harvester ants and a desert ephemeral: seed escape from rodents 

      O'Dowd, Dennis J.; Hay, Mark E. (Georgia Institute of TechnologyEcological Society of America, 1980-06)
      The harvester ants Veromessor pergandei and Pogonomyrmex californicus modify the highly localized seed shadow of the Sonoran Desert ephemeral Datura discolor (Solanaceae) through (1) attraction to food bodies attached to ...
    • Natural abundance of ¹⁵N in particulate nitrogen and zooplankton in the Chesapeake Bay 

      Montoya, Joseph P.; Horrigan, S. G.; McCarthy, J. J. (Georgia Institute of TechnologyInter-Research, 1990-07)
      Samples of dissolved inorganic nitrogen (DIN), particulate nitrogen (PN), and several species of zooplankton were collected at a series of stations in the main channel of the Chesapeake Bay, USA, during cruises in spring ...
    • Natural selection governs local, but not global, evolutionary gene coexpression networks in Caenorhabditis elegans 

      Jordan, I. King; Katz, Lee S.; Denver, Dee R.; Streelman, J. Todd (Georgia Institute of TechnologyBioMed Central, 2008-11-13)
      Background. Large-scale evaluation of gene expression variation among Caenorhabditis elegans lines that have diverged from a common ancestor allows for the analysis of a novel class of biological networks – evolutionary ...
    • Negative selection effects suppress relationships between bacterial diversity and ecosystem functioning 

      Jiang, Lin (Georgia Institute of TechnologyEcological Society of America, 2007-05)
      I assembled bacterial communities to explore the effects of bacterial diversity on multiple ecosystem functions, including bacterial community biovolume, decomposition of particulate organic matter, and biomass transfer ...
    • Nitrogen fixation by Trichodesmium spp.: An important source of new nitrogen to the tropical North Atlantic Ocean 

      Capone, Douglas G.; Burns, James A.; Montoya, Joseph P.; Subramaniam, Ajit; Mahaffey,; Gunderson, Troy; Michaels, Anthony F.; Carpenter, Edward J. (Georgia Institute of TechnologyAmerican Geophysical Union, 2005)
      The broad distribution and often high densities of the cyanobacterium Trichodesmium spp. in oligotrophic waters imply a substantial role for this one taxon in the oceanic N cycle of the marine tropics and subtropics. New ...
    • Nitrogen stable isotope dynamics in the central Baltic Sea: influence of deep-water renewal on the N-cycle 

      Voss, Maren; Nausch, Günter; Montoya, Joseph P. (Georgia Institute of TechnologyInter-Research, 1997-11-17)
      The vertical profiles of NO₃-, NH₄+, O₂, and H₂S as well as the isotopic composition of particulate nitrogen and NH4+ were sampled yearly over a 5 yr period in the Gotland Basin to follow biochemical changes in N-cycling ...
    • No simple dependence between protein evolutionary rate and the number of protein-protein interactions: only the most prolific interactors tend to evolve slowly 

      Jordan, I. King; Wolf, Yuri I.; Koonin, Eugene V. (Georgia Institute of TechnologyBioMed Central, 2003-01-06)
      Background It has been suggested that rates of protein evolution are influenced, to a great extent, by the proportion of amino acid residues that are directly involved in protein function. In agreement with this hypothesis, ...
    • A Null Model of Morphospace Occupation 

      Pie, Marcio R.; Weitz, Joshua S. (Georgia Institute of TechnologyThe University of Chicago, 2005-07)
      Progress in understanding the relationship between lineage diversity, morphological diversity, and morphospace dynamics has been hampered by the lack of an appropriate null model of morphospace occupation. In this article, ...
    • Orientations of transfer RNA in the ribosomal A and P sites 

      Easterwood, Thomas R.; Major, François; Malhortra, Arun; Harvey, Stephen C. (Georgia Institute of TechnologyOxford University Press, 1994-09-11)
      In protein synthesis, peptide bond formation requires that the tRNA carrying the amino acid (A site tRNA) contact the tRNA carrying the growing peptide chain (P site tRNA) at their 3' termini. Two models have been proposed ...
    • Outer Limits and Inner Structure: The 3-Dimensional Flow Field of Pleuromamma Xiphias (Calanoida: Metridinidae) 

      Fields, David M.; Yen, Jeannette (Georgia Institute of TechnologyUniversity of Miami - Rosenstiel School of Marine and Atmospheric Science, 1993-07)
      Copepods create feeding currents to entrain water over their sensory receptors and through their feeding appendages. The flow field also creates a hydrodynamic disturbance which may be detected by the animal's potential ...
    • Ovarian Cancer Detection from Metabolomic Liquid Chromatography/Mass Spectrometry Data by Support Vector Machines 

      Guan, Wei; Zhou, Manshui; Hampton, Christina Young; Benigno, Benedict B.; Walker, L. DeEtte; Gray, Alexander G.; McDonald, John F.; Fernández, Facundo M. (Georgia Institute of TechnologyBioMed Central, 2009-08-22)
      Background: The majority of ovarian cancer biomarker discovery efforts focus on the identification of proteins that can improve the predictive power of presently available diagnostic tests. We here show that metabolomics, ...
    • Packing-limited growth 

      Dodds, Peter Sheridan; Weitz, Joshua S. (Georgia Institute of TechnologyAmerican Physical Society, 2002-05-06)
      We consider growing spheres seeded by random injection in time and space. Growth stops when two spheres meet leading eventually to a jammed state. We study the statistics of growth limited by packing theoretically in d ...
    • Packing-limited growth of irregular objects 

      Dodds, Peter Sheridan; Weitz, Joshua S. (Georgia Institute of TechnologyAmerican Physical Society, 2003-01)
      We study growth limited by packing for irregular objects in two dimensions. We generate packings by seeding objects randomly in time and space and allowing each object to grow until it collides with another object. The ...
    • Palatability and chemical defenses of marine invertebrate larvae 

      Lindquist, Niels Lyle; Hay, Mark E. (Georgia Institute of TechnologyEcological Society of America, 1996-11)
      Risk of larval mortality is a critical component of models and debates concerning the ecology and evolution of the differing reproductive characteristics exhibited by marine invertebrates. In these discussions, predation ...
    • Palatability and defense of some tropical infaunal worms: alkylpyrrole sulfamates as deterrents to fish feeding 

      Kicklighter, Cynthia Ellen; Kubanek, Julia; Barsby, Todd; Hay, Mark E. (Georgia Institute of TechnologyInter-Research, 2003-11-28)
      Numerous studies have investigated chemical defenses among sessile species growing on hard substrates, but few have addressed this for mobile species in soft-sediment communities. We investigated the palatability and ...
    • Parasite-mediated disruptive selection in a natural Daphnia population 

      Duffy, Meghan A.; Brassil, Chad E.; Hall, Spencer R.; Tessier, Alan J.; Cáceres, Carla E.; Conner, Jeffrey K. (Georgia Institute of TechnologyBioMed Central, 2008-03-07)
      Background. A mismatch has emerged between models and data of host-parasite evolution. Theory readily predicts that parasites can promote host diversity through mechanisms such as disruptive selection. Yet, despite these ...