Browsing FAS Scholarly Articles by Title
Now showing items 3851-3870 of 18292
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Direct Observation of Entropic Stabilization of bcc Crystals Near Melting
(American Physical Society, 2017)Crystals with low latent heat are predicted to melt from an entropically stabilized body-centered cubic symmetry. At this weakly first-order transition, strongly correlated fluctuations are expected to emerge, which could ... -
Direct observation of extension and retraction of type IV pili
(National Academy of Sciences, 2001)Type IV pill are thin filaments that extend from the poles of a diverse group of bacteria, enabling them to move at speeds of a few tenths of a micrometer per second. They are required for twitching motility. e,g,, in ... -
Direct parsing of ID/LP grammars
(Springer, 1984)The Immediate Dominance/Linear Precedence (ID/LP) formalism is a recent extension of Generalized Phrase Structure Grammar (GPSG) designed to perform some of the tasks previously assigned to metarules--for example, modeling ... -
Direct phase-sensitive identification of a d-form factor density wave in underdoped cuprates
(Proceedings of the National Academy of Sciences, 2014)The identity of the fundamental broken symmetry (if any) in the underdoped cuprates is unresolved. However, evidence has been accumulating that this state may be an unconventional density wave. Here we carry out site-specific ... -
Direct Photon Production With Effective Field Theory
(Springer Verlag, 2010)The production of hard photons in hadronic collisions is studied using Soft-Collinear Effective Theory (SCET). This is the first application of SCET to a physical, observable cross section involving energetic partons in ... -
Direct Realism and Perceptual Consciousness.
(Wiley-Blackwell, 2006) -
Direct Reciprocity on Graphs
(Elsevier, 2007)Direct reciprocity is a mechanism for the evolution of cooperation based on the idea of repeated encounters between the same two individuals. Here we examine direct reciprocity in structured populations, where individuals ... -
Direct Reciprocity with Costly Punishment: Generous Tit-for-Tat Prevails
(Elsevier, 2009)The standard model for direct reciprocity is the repeated Prisoner's Dilemma, where in each round players choose between cooperation and defection. Here we extend the standard framework to include costly punishment. Now ... -
Direct recognition of homology between double helices of DNA in Neurospora crassa
(2014)Chromosomal regions of identical or nearly identical DNA sequence can preferentially associate with one another in the apparent absence of DNA breakage. Molecular mechanism(s) underlying such homology-dependent pairing ... -
Direct recording and molecular identification of the calcium channel of primary cilia
(2014)Summary A primary cilium is a solitary slender non-motile protuberance of structured microtubules (9+0) enclosed by plasma membrane1. Housing components of the cell division apparatus between cell divisions, they also serve ... -
Direct Recruitment of Polycomb Repressive Complex 1 to Chromatin by Core Binding Transcription Factors
(Elsevier BV, 2012)Polycomb repressive complexes (PRCs) play key roles in developmental epigenetic regulation. Yet the mechanisms that target PRCs to specific loci in mammalian cells remain incompletely understood. In this study we show that ... -
Direct Structural Observation of a Molecular Junction by High-Energy X-Ray Reflectometry
(National Academy of Sciences, 2006)We report a direct angstrom resolution measurement of the structure of a molecular-size electronic junction comprising a single (or a double) layer of alkyl-thiol and alkyl-silane molecules at the buried interface between ... -
Direct Suppression as a Mechanism for Controlling Unpleasant Memories in Daily Life
(American Psychological Association, 2014)Suppressing unwanted memories can impair their later recall. Recent work shows that this forgetting is achieved by at least two mechanisms supported by distinct neural systems: thought substitution and direct suppression ... -
Direct top-quark decay width measurement in the t t ̄ lepton+jets channel at √s = 8 TeV with the ATLAS experiment
(Springer Science and Business Media LLC, 2018-02)This paper presents a direct measurement of the decay width of the top quark using tt ̄ events in the lepton+jets final state. The data sample was collected by the ATLAS detector at the LHC in proton–proton collisions at ... -
Direct Transformation of 2,3-Epoxy Alcohols into Hydroxy Carbonates Under Mildly Basic Conditions
(Elsevier, 1988)2,3-Epoxy alcohols are transformed into the corresponding C2-inverted hydroxy carbonates upon treatment with cesium carbonate-powdered 3-A molecular sieves in N,N-dimethylformamide under one atmosphere of carbon dioxide ... -
Direct Versus Indirect Remedies for Externalities
(University of Chicago Press, 1976)This paper is concerned with tax policies designed to obtain an improved competitive allocation in the presence of consumption externalities. It is known that the full optimum can, in general, be attained only through the ... -
Direct visualization of electrochemical reactions and comparison of commercial carbon papers in operando by fluorescence microscopy using a quinone-based flow cell
(The Electrochemical Society, 2017-07-07)We demonstrate the use of fluorescence microscopy as a tool for mapping the spatial distribution of fluid flow and electrochemical reactions in an operating aqueous quinone flow cell. 9,10- anthraquinone-2,7-disulfonic ... -
Direct visualization of quasi-ordered oxygen chain structures on Au(110)-(1×2)
(Elsevier BV, 2016)The Au(110) surface offers unique advantages for atomically-resolved model studies of catalytic oxidation processes on gold. We investigate the adsorption of oxygen on Au(110) using a combination of scanning tunneling ... -
Direct visualization of three-dimensional crystallization behavior in microgels
(American Physical Society, 2012)We use confocal microscopy to study the three-dimensional (3D) structure of colloidal crystals formed by poly(N-isopropylacrylamide)-co-(acrylic acid) microgels of diameter 1.0-1.5 mu m. The confocal images are tracked to ... -
Direct Writing and Actuation of Three-Dimensionally Patterned Hydrogel Pads on Micropillar Supports
(Wiley-Blackwell, 2011)Freely swelling, three-dimensionally patterned responsive hydrogels fabricated by multiphoton lithography on the tips of flexible pillars provide unique capabilities for the design of adaptive systems. The resulting materials ...