Now showing items 41-60 of 1037

    • Abundance and Size Distribution of Particulate Matter Fractions Near a Caribbean Bank Barrier Reef 

      Simmons, George M., Jr. (Inter-Research, 1979)
      Recent research indicates that corals have the ability to occupy several trophic levels and that particulate matter (PM) appears to play a major role in meeting their daily energy requirements. A study was undertaken to ...
    • Acyl-Homoserine Lactone Recognition and Response Hindering the Quorum-Sensing Regulator EsaR 

      Schu, Daniel J.; Scruggs, Jessica M.; Geissenger, Jared S.; Michel, Katherine G.; Stevens, Ann M. (Public Library of Science, 2014-09-19)
      During quorum sensing in the plant pathogen Pantoea stewartii subsp. stewartii, EsaI, an acyl-homoserine lactone (AHL) synthase, and the transcription factor EsaR coordinately control capsular polysaccharide production. ...
    • ADAM: Analysis of Discrete Models of Biological Systems Using Computer Algebra 

      Hinkelmann, Franziska; Brandon, Madison; Guang, Bonny; McNeill, Rustin; Blekherman, Grigoriy; Veliz-Cuba, Alan; Laubenbacher, Reinhard (2011-07-20)
      Abstract Background Many biological systems are modeled qualitatively with discrete models, such as probabilistic Boolean networks, logical models, Petri nets, and agent-based models, to gain a better understanding of them. ...
    • Adapting to Symptoms of Global Warming Rather Than Addressing the Cause 

      Cairns, John (Virginia Tech, 2014-01-22)
      In recent years, global warming has been ignored and scientists producing evidence supporting this hypothesis have been denigrated and even investigated. However, as irrefutable evidence showing that global warming was a ...
    • An aeroponic culture system for the study of root herbivory on Arabidopsis thaliana 

      Vaughan, Martha M; Tholl, Dorothea; Tokuhisa, James G (2011-03-10)
      Abstract Background Plant defense against herbivory has been studied primarily in aerial tissues. However, complex defense mechanisms have evolved in all parts of the plant to combat herbivore attack and these mechanisms ...
    • Aging in coarsening diluted ferromagnets 

      Park, H.; Pleimling, M. (American Physical Society, 2010-10)
      We comprehensively study nonequilibrium relaxation and aging processes in the two-dimensional randomsite Ising model through numerical simulations. We discuss the dynamical correlation length as well as scaling functions ...
    • Aging processes in systems with anomalous slow dynamics 

      Afzal, N.; Pleimling, M. (American Physical Society, 2013-01-14)
      Recently, different numerical studies of coarsening in disordered systems have shown the existence of a crossover from an initial, transient, power-law domain growth to a slower, presumably logarithmic, growth. However, ...
    • algal periphyton growth on nutrient-diffusing substrates: an in situ bioassay 

      Fairchild, G. W.; Lowe, R. L.; Richardson, W. B. (Ecological Society of America, 1985)
      Differences in nutrient limitation for dominant species within an algal periphyton community were determined using additions of N and P supplied by nutrient-diffusing artificial substrates. Sealed clay flowerpots were ...
    • alpha-states in de Sitter space 

      de Boer, J.; Jejjala, V.; Minic, D. (American Physical Society, 2005-02)
      Field theory in de Sitter space admits a one-parameter family of vacua determined by a superselection parameter alpha. Of these vacua, the Euclidean vacuum uniquely extrapolates to the vacuum of flat Minkowski space. States ...
    • Aluminum plasmonic nanostructures for improved absorption in organic photovoltaic devices 

      Kochergin, V.; Neely, L.; Jao, C. Y.; Robinson, H. D. (AIP Publishing, 2011-03)
      We model the absorption enhancement in organic photovoltaic devices induced by incorporating Al, Ag, and Au nanoparticles in the active layer. We find that Al nanoparticles should yield significantly greater enhancement ...
    • An atomic force microscope tip as a light source 

      Lulevich, V.; Honig, C.; Ducker, W. A. (AIP Publishing, 2005-12)
      We present a simple method for causing the end of a silicon nitride atomic force microscope (AFM) tip to emit light, and we use this emitted light to perform scanning near-field optical microscopy. Illumination of a silicon ...
    • An effective method for parameter estimation with pde constraints with multiple right-hand sides 

      Haber, E.; Chung, M.; Herrmann, F. (Siam Publications, 2012)
      Often, parameter estimation problems of parameter-dependent PDEs involve multiple right-hand sides. The computational cost and memory requirements of such problems increase linearly with the number of right-hand sides. For ...
    • An elementary nonlinear beam theory with finite buckling deformation properties 

      Russell, D. L.; White, L. W. (Siam Publications, 2002-04)
      A simple nonlinear beam model is derived from basic principles. The assumption upon which the derivation is based is that axial motions are of second order compared with transverse motions of the beam. The existence of ...
    • Analysis and approximation of the velocity tracking problem for Navier-Stokes flows with distributed control 

      Gunzburger, M. D.; Manservisi, S. (Siam Publications, 2000-05)
      We consider the mathematical formulation, analysis, and the numerical solution of a time-dependent optimal control problem associated with the tracking of the velocity of a Navier-Stokes ow in a bounded two-dimensional ...
    • Analysis of a generic model of eukaryotic cell-cycle regulation 

      Csikasz-Nagy, A.; Battogtokh, D.; Chen, K. C.; Novak, B.; Tyson, J. J. (CELL PRESS, 2006-06)
      We propose a protein interaction network for the regulation of DNA synthesis and mitosis that emphasizes the universality of the regulatory system among eukaryotic cells. The idiosyncrasies of cell cycle regulation in ...
    • Analysis of optical response of long period fiber gratings to nm-thick thin-film coatings 

      Wang, Z. Y.; Heflin, J. R.; Stolen, R. H.; Ramachandran, S. (Optical Society of America, 2005-04)
      We have theoretically and experimentally demonstrated that the resonant wavelength of long period fiber gratings (LPG) can be shifted by a large magnitude by coating with only a nm-thickthin-film that has a refractive index ...
    • Analysis of rice glycosyl hydrolase family 1 and expression of Os4bglu12 beta-glucosidase 

      Opassiri, Rodjana; Pomthong, Busarakum; Onkoksoong, Tassanee; Akiyama, Takashi; Esen, Asim; Ketudat Cairns, James R (2006-12-29)
      Abstract Background Glycosyl hydrolase family 1 (GH1) β-glucosidases have been implicated in physiologically important processes in plants, such as response to biotic and abiotic stresses, defense against herbivores, ...
    • Analysis of T-DNA alleles of flavonoid biosynthesis genes in Arabidopsis ecotype Columbia 

      Bowerman, Peter A; Ramirez, Melissa V; Price, Michelle B; Helm, Richard F; Winkel, Brenda SJ (2012-09-04)
      Abstract Background The flavonoid pathway is a long-standing and important tool for plant genetics, biochemistry, and molecular biology. Numerous flavonoid mutants have been identified in Arabidopsis over the past several ...
    • analysis of the dispersion function for anisotropic longitudinal plasma-waves 

      Arthur, M. D.; Bowden, R. L.; Zweifel, P. F. (AIP Publishing, 1979-10)
      An analysis of the zeros of the dispersion function for longitudinal plasma waves is made. In particular, the plasma equilibriumdistribution function is assumed to have two relative maxima and is not necessarily an even ...
    • Analytic approximation to the ground-state energy of the Anderson model 

      Mancini, J. D.; Massano, W. J.; Potter, C. D.; Bowen, S. P. (American Physical Society, 1988-09)
      Using the nonperturbative Lanczos recursion scheme an analytic approximation to the ground-state energy of the single-impurity Anderson model is obtained. Calculations are carried out to a 5x5 matrix truncation. Comparisons ...