Now showing items 3023-3042 of 14416

    • Dimetrodon: Processor-level Preventive Thermal Management via Idle Cycle Injection 

      Bailis, Peter; Reddi, Vijay Janapa; Gandhi, Sanjay; Brooks, David M.; Seltzer, Margo I. (ACM, 2011)
      Processor-level dynamic thermal management techniques have long targeted worst-case thermal margins. We examine the thermal-performance trade-offs in average-case, preventive thermal management by actively degrading ...
    • Diminished Schwann Cell Repair Responses Underlie Age-Associated Impaired Axonal Regeneration 

      Painter, Michio Wendell; Brosius Lutz, Amanda; Cheng, Yung-Chih; Latremoliere, Alban; Duong, Kelly; Miller, Christine; Posada, Sean; Cobos, Enrique J.; Zhang, Alan; Wagers, Amy Jo; Havton, Leif A.; Barres, Ben; Omura, Takao; Woolf, Clifford (Elsevier BV, 2014)
      The regenerative capacity of the peripheral nervous system declines with age. Why this occurs, however, is unknown. We demonstrate that 24-month-old mice exhibit an impairment of functional recovery after nerve injury ...
    • Diminishing Returns Epistasis Among Beneficial Mutations Decelerates Adaptation 

      Chou, H.-H.; Chiu, H.-C.; Delaney, N. F.; Segre, D.; Marx, Christopher J (American Association for the Advancement of Science (AAAS), 2011)
      Epistasis has substantial impacts on evolution, in particular, the rate of adaptation. We generated combinations of beneficial mutations that arose in a lineage during rapid adaptation of a bacterium whose growth depended ...
    • Dimpled elastic sheets: a new class of non-porous negative Poisson’s ratio materials 

      Javid, Farhad; Smith-Roberge, Evelyne; Innes, Matthew C.; Shanian, Ali; Weaver, James C.; Bertoldi, Katia (Nature Publishing Group, 2015)
      In this study, we report a novel periodic material with negative Poisson’s ratio (also called auxetic materials) fabricated by denting spherical dimples in an elastic flat sheet. While previously reported auxetic materials ...
    • A Dinuclear Palladium Catalyst for \(\alpha\)-Hydroxylation of Carbonyls with \(O_2\) 

      Chuang, Gary Jing; Wang, Weike; Lee, Eunsung; Ritter, Tobias (American Chemical Society, 2011)
      A chemo- and regioselective \(\alpha\)-hydroxylation reaction of carbonyl compounds with molecular oxygen as oxidant is reported. The hydroxylation reaction is catalyzed by a dinuclear Pd(II) complex, which functions as ...
    • Diophantine and Ergodic Foliations on Surfaces 

      McMullen, Curtis T. (Oxford University Press, 2012-11-16)
    • A diphoton resonance from bulk RS 

      Csáki, Csaba; Randall, Lisa (Springer Nature, 2016)
      Recent LHC data hinted at a 750 GeV mass resonance that decays into two photons. A significant feature of this resonance is that its decays to any other Standard Model particles would be too low to be detected so far. Such ...
    • The Direct and Ecological Costs of an Ant-Plant Symbiosis 

      Frederickson, Megan E.; Ravenscraft, Alison; Miller, Gabriel; Hernández, Lina M. Arcila; Booth, Gregory; Pierce, Naomi Ellen (University of Chicago Press, 2012)
      How strong is selection for cheating in mutualisms? The answer depends on the type and magnitude of the costs of the mutualism. Here we investigated the direct and ecological costs of plant defense by ants in the association ...
    • Direct and indirect forms of non-suicidal self-injury: Evidence for a distinction 

      St. Germain, Sarah Ann; Hooley, Jill Miranda (Elsevier BV, 2012)
      Non-suicidal self-injury (NSSI) involves deliberate acts (such as cutting) that directly damage the body but occur without suicidal intent. However, other non-suicidal behaviors that involve people mistreating or abusing ...
    • A Direct Comparison of Scan and Focal Sampling Methods for Measuring Wild Chimpanzee Feeding Behaviour 

      Gilby, Ian C.; Pokempner, Amy; Wrangham, Richard W. (Karger, 2010)
      Focal sampling is the most accurate method for measuring primate activity budgets, but is sometimes impractical. An alternative is scan sampling, in which the behaviour of the group is recorded at regular intervals. The ...
    • Direct Estimation of Single- and Two-Qubit Hamiltonians and Relaxation Rates 

      Mohseni, Masoud; Rezakhani, Ali T.; Aspuru-Guzik, Alan (The American Physical Society, 2008)
      We provide an approach for characterization of quantum Hamiltonian systems via utilizing a single measurement device. Specifically, we demonstrate how external quantum correlations can be used for Hamiltonian identification ...
    • Direct Gamete Sequencing Reveals No Evidence for Segregation Distortion in House Mouse Hybrids 

      Corbett-Detig, Russell; Jacobs-Palmer, Emily; Hartl, Daniel; Hoekstra, Hopi (Public Library of Science, 2015)
      Understanding the molecular basis of species formation is an important goal in evolutionary genetics, and Dobzhansky-Muller incompatibilities are thought to be a common source of postzygotic reproductive isolation between ...
    • Direct Graphene Growth on Insulator 

      Lippert, Gunther; Dabrowski, Jarek; Lemme, Max; Marcus, Charles Masamed; Seifarth, Olaf; Lupina, Grzegorz (Wiley, 2011)
      Fabrication of graphene devices is often hindered by incompatibility between the silicon technology and the methods of graphene growth. Exfoliation from graphite yields excellent films but is good mainly for research. ...
    • Direct haplotyping of kilobase-size DNA using carbon nanotube probes 

      Woolley, Adam T.; Guillemette, Chantal; Cheung, Chin Li; Housman, David E.; Lieber, Charles (Nature Publishing Group, 2000)
      We have implemented a method for multiplexed detection of polymorphic sites and direct determination of haplotypes in 10-kilobase- size DNA fragments using single-walled carbon nanotube (SWNT) atomic force microscopy ...
    • Direct Imaging of Atomic-Scale Ripples in Few-Layer Graphene 

      Wang, Wei Li; Bhandari, Sagar; Yi, Wei; Bell, David C.; Westervelt, Robert M.; Kaxiras, Efthimios (American Chemical Society, 2012)
      Graphene has been touted as the prototypical two-dimensional solid of extraordinary stability and strength. However, its very existence relies on out-of-plane ripples as predicted by theory and confirmed by experiments. ...
    • Direct Imaging of Human SWI/SNF-Remodeled Mono- and Polynucleosomes by Atomic Force Microscopy Employing Carbon Nanotube Tips 

      Schnitzler, Gavin R.; Cheung, Chin Li; Hafner, Jason H.; Saurin, Andrew J.; Kingston, Robert E.; Lieber, Charles (American Society for Microbiology, 2001)
      Chromatin-remodeling complexes alter chromatin structure to facilitate, or in some cases repress, gene expression. Recent studies have suggested two potential pathways by which such regulation might occur. In the first, ...
    • Direct Injection Tunnel Spectroscopy of a p-n Junction 

      Likovich, Edward Michael; Russell, Kasey Joe; Narayanamurti, Venkatesh; Lu, Hong; Gossard, Arthur C. (American Institute of Physics, 2009)
      We demonstrate spectroscopic measurements on an InGaAs p-n junction using direct tunnel injection of electrons. In contrast to the metal-base transistor design of conventional ballistic electron emission spectroscopy (BEES), ...
    • Direct Interaction of FliX and FlbD is Required for Their Regulatory Activity in Caulobacter crescentus 

      Xu, Zhaohui; Dutton, Rachel Janelle; Gober, James W (BioMed Central, 2011)
      Background: The temporal and spatial expression of late flagellar genes in Caulobacter crescentus is activated by the transcription factor FlbD and its partner trans-acting factor FliX. The physical interaction of these ...
    • Direct Interfacial Y731 Oxidation in α2 by a Photoβ2 Subunit of E. Coli Class Ia Ribonucleotide Reductase 

      Song, David Y.; Pizano, Arturo A.; Holder, Patrick G.; Stubbe, JoAnne; Nocera, Daniel (Royal Society of Chemistry (RSC), 2015)
      Proton-coupled electron transfer (PCET) is a fundamental mechanism important in a wide range of biological processes including the universal reaction catalysed by ribonucleotide reductases (RNRs) in making de novo, the ...
    • Direct measurement of crystal surface stress 

      Martinez, Robert; Augustyniak, Walter; Golovchenko, Jene Andrew (American Physical Society (APS), 1990)
      We have measured surface stresses on clean Si(111) 7×7 by comparing this surface to a reference surface on which gallium atoms are adsorbed under UHV conditions. Stresses are determined by optically measuring the macroscopic ...