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  • 1
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    Array-Based Disease Diagnostics Using Lipid/Polydiacetylene Vesicles Encapsulated in a Sol–Gel Matrix (2012)
    American Chemical Society (ACS)
    Details
    Publication Date: 2012-07-08
    Description: Analytical Chemistry DOI: 10.1021/ac300449u
    Print ISSN: 0003-2700
    Electronic ISSN: 1520-6882
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society (ACS)
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  • 2
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    Mesoscale and microscale shock effects in the LL6 S4 chondrites Saint‐Séverin and Elbert: A tale of two breccias (2019)
    Details
    Publication Date: 2019
    Description: Abstract Saint‐Séverin and Elbert, two LL6 chondrite breccias, were systematically studied to evaluate multiple deformation effects on spatial scales ranging from thin section (mesoscale) to micron‐submicron (microscale) using optical microscopy, electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM). The different techniques provide consistent results but have complementary strengths, together providing a powerful approach to unravel even complex impact histories. Both meteorites have an S4 conventional shock stage, but interclast areas are more deformed, and clasts are more deformed in Elbert than in Saint‐Séverin. TEM and EBSD data provide compelling evidence that Saint‐Séverin experienced significant shock deformation while already hot, and cooled rapidly afterward, as a result of a major, possibly disruptive impact on the LL chondrite parent body ~4.4 Ga ago. In contrast, Elbert was shocked from a cold initial state but was heated significantly during shock, and cooled in a localized hot impact deposit on the LL asteroid. Both meteorites probably were shocked at least twice; data for Saint‐Séverin are best reconciled with a three‐impact model.
    Print ISSN: 1086-9379
    Electronic ISSN: 1945-5100
    Topics: Geosciences , Physics
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  • 3
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    Probing global aspects of a geometry by the self-force on a charge: Spherical thin-shell wormholes (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-12-06
    Description: Author(s): E. Rubín de Celis, O. P. Santillán, and C. Simeone The self-interaction for a static point charge in the space-time of a thin-shell wormhole constructed connecting two identical Schwarzschild geometries is calculated in a series expansion. The electrostatic self-force is evaluated numerically. It is found to be attractive towards the throat except f... [Phys. Rev. D 88, 124012] Published Thu Dec 05, 2013
    Keywords: General relativity, gravitation
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Assessing Grain-Size Correspondence Between Flow and Deposits of Controlled Floods In the Colorado River, U.S.A (2013)
    Society for Sedimentary Geology (SEPM)
    Details
    Publication Date: 2013-12-14
    Description: A bstract :  Flood-deposited sediment has been used to decipher environmental parameters such as variability in watershed sediment supply, paleoflood hydrology, and channel morphology. It is not well known, however, how accurately the deposits reflect sedimentary processes within the flow, and hence what sampling intensity is needed to decipher records of recent or long-past conditions. We examine these problems using deposits from dam-regulated floods in the Colorado River corridor through Marble Canyon–Grand Canyon, Arizona, U.S.A., in which steady-peaked floods represent a simple end-member case. For these simple floods, most deposits show inverse grading that reflects coarsening suspended sediment (a result of fine-sediment-supply limitation), but there is enough eddy-scale variability that some profiles show normal grading that did not reflect grain-size evolution in the flow as a whole. To infer systemwide grain-size evolution in modern or ancient depositional systems requires sampling enough deposit profiles that the standard error of the mean of grain-size-change measurements becomes small relative to the magnitude of observed changes. For simple, steady-peaked floods, 5–10 profiles or fewer may suffice to characterize grain-size trends robustly, but many more samples may be needed from deposits with greater variability in their grain-size evolution.
    Print ISSN: 1527-1404
    Topics: Geosciences
    Published by Society for Sedimentary Geology (SEPM)
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  • 5
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    Compound earthquakes on a bimaterial interface and implications for rupture mechanics (2014)
    Oxford University Press
    Details
    Publication Date: 2014-04-16
    Description: Earthquake ruptures on the San Andreas Fault are affected by the material contrast across the fault. Previous observations of microearthquakes at the northern end of the creeping section have found strong signals of asymmetry in both rupture directivity (preferential propagation to the SE), and aftershock asymmetry (many more to the NW, on timescales from 10 s to 9 hr). To understand the aftershock asymmetry, Rubin & Ampuero simulated slip-weakening ruptures on a bimaterial interface and observed differences in the timescales for the two edges to experience their peak stress after being slowed by barriers. This is suggestive of the possibility of asymmetry of subevents in compound earthquakes. A second possible source of subevent asymmetry is that when slowed by barriers, a significant tensile stress pulse is predicted to propagate in the SE but not the NW direction. To study the possible asymmetry of subevent distribution, we search for compound events using an empirical Green's function method. Three sections on the northern San Andreas and part of the Calaveras faults were selected where the events have high spatial density and similar focal mechanisms. About 677 candidate compound events were identified in a 28 869-event catalogue from 1984 to 2009. Most delays between the two subevents cluster around the shear wave transit time over the subevent separation, although with considerable scatter. For subevents on the San Andreas Fault separated by 0.7–2 times the estimated radius of the first subevent (the same spatial separation found to exhibit strong asymmetry of longer term aftershocks), nearly twice as many second subevents occurred to the SE of the first than to the NW. This asymmetry of second subevent distribution is not present on the Calaveras Fault, which does not have a significant across-fault contrast in wave speed in this region. One interpretation is that the extra SE subevents on the San Andreas Fault are representative of the events ‘missing'from the ‘longer term’(10 s–9 hr) aftershock population because they became part of the main shock.
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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  • 6
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    Genome-wide fitness assessment during diurnal growth reveals an expanded role of the cyanobacterial circadian clock protein KaiA [Microbiology] (2018)
    National Academy of Sciences
    Details
    Publication Date: 2018-07-25
    Description: The recurrent pattern of light and darkness generated by Earth’s axial rotation has profoundly influenced the evolution of organisms, selecting for both biological mechanisms that respond acutely to environmental changes and circadian clocks that program physiology in anticipation of daily variations. The necessity to integrate environmental responsiveness and circadian programming...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 7
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    Mesosiderite clasts with the most extreme positive europium anomalies among solar system rocks (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-08-21
    Description: Pigeonite-plagioclase gabbros that occur as clasts in mesosiderites (brecciated stony-iron meteorites) show extreme fractionations of the rare-earth elements (REEs) with larger positive europium anomalies than any previously known for igneous rocks from the Earth, moon, or meteorite parent bodies and greater depletions of light REEs relative to heavy REEs than known for comparable cumulate gabbros. The REE pattern for merrillite in one of these clasts is depleted in light REEs and has a large positive europium anomaly as a result of metamorphic equilibration with the silicates. The extreme REE ratios exhibited by the mesosiderite clasts demonstrate that multistage igneous processes must have occurred on some asteroids in the early solar system. Melting of the crust by large-scale impacts or electrical induction from an early T-Tauri-phase sun may be responsible for these processes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mittlefehldt, D W -- Rubin, A E -- Davis, A M -- New York, N.Y. -- Science. 1992 Aug 21;257(5073):1096-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17840277" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 8
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    Planetary science. Fragments of the lunar cataclysm (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2012-05-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rubin, Alan E -- New York, N.Y. -- Science. 2012 Jun 15;336(6087):1390-1. doi: 10.1126/science.1224184. Epub 2012 May 17.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, USA. aerubin@ucla.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22604721" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 9
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    Analysis of Synchronization in a Slowly Changing Environment: How Slow Coupling Becomes Fast Weak Coupling (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-05-14
    Description: Author(s): Jonathan J. Rubin, Jonathan E. Rubin, and G. Bard Ermentrout Many physical and biological oscillators are coupled indirectly through a slowly evolving dynamic medium. We present a perturbation method that shows that slow dynamics of a coupling medium is effectively equivalent to weak coupling of oscillators. Our methods first apply the theory of averaging to ... [Phys. Rev. Lett. 110, 204101] Published Mon May 13, 2013
    Keywords: Nonlinear Dynamics, Fluid Dynamics, Classical Optics, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 10
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    Speech perception without traditional speech cues (1981)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1981-05-22
    Description: A three-tone sinusoidal replica of a naturally produced utterance was identified by listeners, despite the readily apparent unnatural speech quality of the signal. The time-varying properties of these highly artificial acoustic signals are apparently sufficient to support perception of the linguistic message in the absence of traditional acoustic cues for phonetic segments.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Remez, R E -- Rubin, P E -- Pisoni, D B -- Carrell, T D -- HD-01994/HD/NICHD NIH HHS/ -- MH 24027/MH/NIMH NIH HHS/ -- MH 32848/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1981 May 22;212(4497):947-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7233191" target="_blank"〉PubMed〈/a〉
    Keywords: Auditory Perception/physiology ; Humans ; *Phonetics ; Speech Perception/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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