Now showing items 532-551 of 911

  • Nanotechnology: Nature's Gift or Scientists' Brainchild? 

    Hochella, Michael F., Jr.; Spencer, Michael G.; Jones, Kimberly L. (The Royal Society of Chemistry, 2014-12-02)
    In the field of environmental nanotechnology, opinions on the novelty of engineered nanomaterials vary; some scientists believe that many engineered nanomaterials are indeed unique, while others are convinced that we are ...
  • Natural history note - A novel terrestrial fish habitat inside emergent logs 

    Taylor, D. S.; Turner, B. J.; Davis, W. P.; Chapman, B. B. (University of Chicago Press, 2008-02)
    Reports of new habitats for a major group of organisms are rare. Fishes display diverse adaptations for temporary (amphibious) existence on land, but to our knowledge, none have ever been reported regularly living inside ...
  • Natural Law/ Human Law 

    Cairns, John (Virginia Tech, 2014-01-22)
    This commentary is a response to Cormac Cullinan s 2008 article in Orion. In the article, Cullinan writes, _In the eyes of American law today, most of the community of life on Earth remains mere property, natural «resources ...
  • Nature of the condensate in mass transport models 

    Majumdar, S. N.; Evans, M. R.; Zia, R. K. P. (American Physical Society, 2005-05-13)
    We study the phenomenon of real space condensation in the steady state of a class of one-dimensional mass transport models. We derive the criterion for the occurrence of a condensation transition and analyze the precise ...
  • Nature's Way: Quantity First, Quality Next 

    Cairns, John (Virginia Tech, 2014-01-22)
    In nature, each species produces a larger quantity of offspring than needed for replacement. From this larger quantity, nature selects quality, or the fittest individuals for the specific ecologic niche the species holds. ...
  • Neel temperature and thermodynamics of the half-filled three-dimensional Hubbard model by diagrammatic determinant Monte Carlo 

    Kozik, E.; Burovski, E.; Scarola, V. W.; Troyer, M. (American Physical Society, 2013-05-03)
    We study the thermodynamics of the three-dimensional Hubbard model at half filling on approach to the Neel transition by means of large-scale unbiased diagrammatic determinant Monte Carlo simulations. We obtain the transition ...
  • Network Topologies and Dynamics Leading to Endotoxin Tolerance and Priming in Innate Immune Cells 

    Fu, Yan; Glaros, Trevor; Zhu, Meng; Wang, Ping; Wu, Zhanghan; Tyson, John J.; Li, Liwu; Xing, Jianhua (Public Library of Science, 2012-05-05)
    The innate immune system, acting as the first line of host defense, senses and adapts to foreign challenges through complex intracellular and intercellular signaling networks. Endotoxin tolerance and priming elicited by ...
  • New Ediacara fossils preserved in marine limestone and their ecological implications 

    Chen, Z.; Zhou, C. M.; Xiao, S. H.; Wang, W.; Guan, C. G.; Hua, H.; Yuan, X. L. (Nature Publishing Group, 2014-02)
    Ediacara fossils are central to our understanding of animal evolution on the eve of the Cambrian explosion, because some of them likely represent stem-group marine animals. However, some of the iconic Ediacara fossils have ...
  • New results in the theory of wetting transitions (invited) 

    Kroll, D. M. (American Institute of Physics, 1987-04-15)
    The aim of this contribution is to draw attention to some recent developments in the theory of wettingtransitions which may be of interest to the magnetism community. After presenting a qualitative discussion of wetting ...
  • nitrogen cycling in a forest stream determined by a n-15 tracer addition 

    Mulholland, P. J.; Tank, J. L.; Sanzone, D. M.; Wollheim, W. M.; Peterson, B. J.; Webster, J. R.; Meyer, J. L. (Ecological Society of America, 2000-08)
    Nitrogen uptake and cycling was examined using a six-week tracer addition of N-15-labeled ammonium in early spring in Walker Branch, a first-order deciduous forest stream in eastern Tennessee. Prior to the N-15 addition, ...
  • Nitrogen K-Shell Photoabsorption 

    Garcia, J.; Kallman, T. R.; Witthoeft, M.; Behar, E.; Mendoza, C.; Palmeri, P.; Quinet, P.; Bautista, M. A.; Klapisch, M. (IOP PUBLISHING LTD, 2009-12)
    Reliable atomic data have been computed for the spectral modeling of the nitrogen K lines, which may lead to useful astrophysical diagnostics. Data sets comprise valence and K-vacancy level energies, wavelengths, Einstein ...
  • nitrogen saturation in stream ecosystems 

    Earl, S. R.; Valett, H. M.; Webster, J. R. (Ecological Society of America, 2006-12)
    The concept of nitrogen (N) saturation has organized the assessment of N loading in terrestrial ecosystems. Here we extend the concept to lotic ecosystems by coupling Michaelis-Menten kinetics and nutrient spiraling. We ...
  • The Non-Pesticide Silent Spring 

    Cairns, John (Virginia Tech, 2014-01-22)
    This commentary was a result of John Cairns, Jr. witnessing the blocking of the US Senate resolution to honor Rachel Carson on what would have been her 100th birthday in 2007. When Carson s controversial book Silent Spring, ...
  • Noncanonical Reactions of Flavoenzymes 

    Sobrado, Pablo (MDPI, 2012-11-05)
    Enzymes containing flavin cofactors are predominantly involved in redox reactions in numerous cellular processes where the protein environment modulates the chemical reactivity of the flavin to either transfer one or two ...
  • Nonequilibrium Relaxation and Critical Aging for Driven Ising Lattice Gases 

    Daquila, G. L.; Tauber, U. C. (American Physical Society, 2012-03-13)
    We employ Monte Carlo simulations to study the nonequilibrium relaxation of driven Ising lattice gases in two dimensions. Whereas the temporal scaling of the density autocorrelation function in the nonequilibrium steady ...
  • Nonlinear current-induced forces in Si atomic wires 

    Yang, Z. Q.; Di Ventra, M. (American Physical Society, 2003-04)
    We report first-principles calculations of current-induced forces in Si atomic wires as a function of bias and wire length. We find that these forces are strongly nonlinear as a function of bias due to the competition ...
  • Nonlinear integral inequalities in two independent variables and their applications 

    Zheng, K.; Wu, Y.; Deng, S. F. (Hindawi Publishing Corporation, 2007)
    This paper generalizes results of Cheung and Ma (2005) to more general inequalities with more than one distinct nonlinear term. From our results, some results of Cheung and Ma ( 2005) can be deduced as some special cases. ...
  • Nonuniversal exponents in interface growth - Newman and Swift reply 

    Newman, T. J.; Swift, M. R. (American Physical Society, 1998-12-14)
  • Notes on spacetime thermodynamics and the observer dependence of entropy 

    Marolf, D.; Minic, D.; Ross, S. F. (American Physical Society, 2004-03)
    Because of the Unruh effect, accelerated and inertial observers differ in their description of a given quantum state. The implications of this effect are explored for the entropy assigned by such observers to localized ...
  • Nucleation of superconductivity in finite anisotropic superconductors and the evolution of surface superconductivity toward the bulk mixed state 

    Kogan, V. G.; Clem, J. R.; Deang, J. M.; Gunzburger, M. D. (American Physical Society, 2002-02-14)
    In anisotropic superconductors having an arbitrary orientation of the sample surface relative to the crystal principal axes, the surface critical field H-c3 is less than 1.695H(c2) unless the field is situated along one ...