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The Cambridge Columbus Botanical Study, Venezuela 1990

Mark Dutton
1990 Environmental Conservation  
doi:10.1017/s0376892900032872 fatcat:n6e4ezma7rhzbdz7d4f57oc7mm

Pain Prevalence and Treatment Patterns in a US Children's Hospital

K. Shomaker, S. Dutton, M. Mark
2015 Hospital Pediatrics  
A B S T R A C T OBJECTIVE: Hospitalized children experience significant pain despite improvement efforts. This study was undertaken to better understand the epidemiology of acute pain in hospitalized children and the extent to which existing measures reveal targets for improving pain management. METHODS: A cross-sectional survey was used to audit pain assessment, intensity, prevalence, source, and treatment hospital-wide on a single day in 2011. Chart audits were performed on patients aged 0 to
more » ... patients aged 0 to 21 years. All patients had the option to participate in a structured interview about their pain experience. RESULTS: The audit included 112 children, 47 of whom were interviewed. Pain prevalence obtained by child/parent interview (72%) was more than twice that documented by nurses (30%). Infants, but not cognitively impaired children, had significantly lower rates of pain detection and analgesic ordering than older age groups. Procedural pain was the most frequently cited source of pain among interviewed patients and was poorly addressed in the medical record. Fifty percent of children with documented moderate-to-severe pain received scheduled pain medications. More than one-third of interviewed patients would have wanted more pain medication if it could have been safely given. CONCLUSIONS: Specific gaps remain in the quality of pain management provided to hospitalized children. Focus on infant pain detection, assessment and management of procedural pain, and scheduled analgesic ordering are sensible targets for future process improvement efforts.
doi:10.1542/hpeds.2014-0195 pmid:26136310 fatcat:ouosruhxjnfzvlenjli7qqjcwe

Performance of polar codes for quantum and private classical communication

Zachary Dutton, Saikat Guha, Mark M. Wilde
2012 2012 50th Annual Allerton Conference on Communication, Control, and Computing (Allerton)  
We analyze the practical performance of quantum polar codes, by computing rigorous bounds on block error probability and by numerically simulating them. We evaluate our bounds for quantum erasure channels with coding block lengths between 2^10 and 2^20, and we report the results of simulations for quantum erasure channels, quantum depolarizing channels, and "BB84" channels with coding block lengths up to N = 1024. For quantum erasure channels, we observe that high quantum data rates can be
more » ... a rates can be achieved for block error rates less than 10^(-4) and that somewhat lower quantum data rates can be achieved for quantum depolarizing and BB84 channels. Our results here also serve as bounds for and simulations of private classical data transmission over these channels, essentially due to Renes' duality bounds for privacy amplification and classical data transmission of complementary observables. Future work might be able to improve upon our numerical results for quantum depolarizing and BB84 channels by employing a polar coding rule other than the heuristic used here.
doi:10.1109/allerton.2012.6483269 dblp:conf/allerton/DuttonGW12 fatcat:vvsar4dr2zcjlkhr5zwfmfyuwe

Channelization architecture for wide-band slow light in atomic vapors [article]

Zachary Dutton, Mark Bashkansky, Michael Steiner, John Reintjes
2005 arXiv   pre-print
We propose a "channelization" architecture to achieve wide-band electromagnetically induced transparency (EIT) and ultra-slow light propagation in atomic Rb-87 vapors. EIT and slow light are achieved by shining a strong, resonant "pump" laser on the atomic medium, which allows slow and unattenuated propagation of a weaker "signal" beam, but only when a two-photon resonance condition is satisfied. Our wideband architecture is accomplished by dispersing a wideband signal spatially, transverse to
more » ... lly, transverse to the propagation direction, prior to entering the atomic cell. When particular Zeeman sub-levels are used in the EIT system, then one can introduce a magnetic field with a linear gradient such that the two-photon resonance condition is satisfied for each individual frequency component. Because slow light is a group velocity effect, utilizing differential phase shifts across the spectrum of a light pulse, one must then introduce a slight mismatch from perfect resonance to induce a delay. We present a model which accounts for diffusion of the atoms in the varying magnetic field as well as interaction with levels outside the ideal three-level system on which EIT is based. We find the maximum delay-bandwidth product decreases with bandwidth, and that delay-bandwidth product ~1 should be achievable with bandwidth ~50 MHz (~5 ns delay). This is a large improvement over the ~1 MHz bandwidths in conventional slow light systems and could be of use in signal processing applications.
arXiv:quant-ph/0510160v1 fatcat:xl55iydeyzfhdmqk4b5e23fefi

Insights from the Paleogene tropical Pacific: Foraminiferal stable isotope and elemental results from Site 1209, Shatsky Rise

Andrea Dutton, Kyger C Lohmann, R. Mark Leckie
2005 Paleoceanography  
More information on this procedure and the results of these geochemical analyses are detailed by Dutton et al. [2005] .  ...  These intervals are both marked by relatively rapid change in d 18 O relative to the Mg/Ca record. 4. Discussion 4.1.  ... 
doi:10.1029/2004pa001098 fatcat:utpqeddy4vcghjjupgud4y4fri

Editorial: Integrating Emerging Technologies Into Marine Megafauna Conservation Management

Peter H. Dutton, Lisa Komoroske, Lars Bejder, Mark Meekan
2019 Frontiers in Marine Science  
Copyright © 2019 Dutton, Komoroske, Bejder and Meekan. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY).  ... 
doi:10.3389/fmars.2019.00693 fatcat:zaww3mfj6bdqfpbac7a7wue4ty

Development of chiral metal amides as highly reactive catalysts for asymmetric [3 + 2] cycloadditions

Yasuhiro Yamashita, Susumu Yoshimoto, Mark J Dutton, Shū Kobayashi
2016 Beilstein Journal of Organic Chemistry  
Highly efficient catalytic asymmetric [3 + 2] cycloadditions using a chiral copper amide are reported. Compared with the chiral CuOTf/Et 3 N system, the CuHMDS system showed higher reactivity, and the desired reactions proceeded in high yields and high selectivities with catalyst loadings as low as 0.01 mol %.
doi:10.3762/bjoc.12.140 pmid:27559396 pmcid:PMC4979734 fatcat:re47qsoj45cvxorwjcpgtmoxd4

Karst-driven flexural isostasy in North-Central Florida

Han Byul Woo, Mark P. Panning, Peter N. Adams, Andrea Dutton
2017 Geochemistry Geophysics Geosystems  
Deformed marine terraces can be used to explore a region's uplift history. Trail Ridge is a marine terrace in north Florida that is nearly 80 m above modern sea level and contains Quaternary marine fossils, a fact that is inconsistent with estimates of paleo-sea level history since the early Pleistocene. This implies that the terrace has experienced uplift since its formation, as well as nonuniform deformation recorded by the warping of its previously horizontal state. The Florida carbonate
more » ... orida carbonate platform, located on the passive margin of eastern North America, is a setting where nontectonic influences (e.g. isostatic adjustment, dynamic topography) can be examined. We present a single-transect, numerical model of vertical displacement, derived from elastic flexure, to assess the influence of karst-driven isostatic uplift on present day topography of Trail Ridge in north Florida. Flexural modeling predicts elevations in central Florida not observed today, most likely because surface erosion and karst cavity collapse have obliterated this high topography. Older subsurface stratigraphic units, however, display the arched profile predicted from flexural modeling. Mass loss, calculated by differencing modeled topography and observed topography, was found to be 6.75 3 10 12 kg, since emplacement of Trail Ridge. Uplift rates, assuming karst-driven flexural isostasy alone, using previously estimated ages of Trail Ridge of 0.125, 1.4, 3, or 3.5 Ma were found to be 0.535, 0.048, 0.022, and 0.019 mm/yr, respectively. A more likely explanation of uplift includes contributions from dynamic topography and glacial isostatic adjustment which should be further explored with more advanced geophysical modeling. Key Points: Karstification induced isostatic uplift Flexural response of the lithosphere from uplift Near-passive margin landscape evolution Supporting Information: Supporting Information S1
doi:10.1002/2017gc006934 fatcat:5b67llbdjvhhhbzuxbvxde4hbq

Sonic Hedgehog Promotes Neuronal Differentiation of Murine Spinal Cord Precursors and Collaborates with Neurotrophin 3 to Induce Islet-1

Renée Dutton, Toshiya Yamada, Ann Turnley, Perry F. Bartlett, Mark Murphy
1999 Journal of Neuroscience  
., April 1, 1999, 19(7):2601-2608 Dutton et al. • Motoneuron Specification by Shh and NT3 J. Neurosci., April 1, 1999, 19(7):2601-2608 Dutton et al. • Motoneuron Specification by Shh and NT3  ...  B, Higher-power view of neuron marked witn an arrow in A, showing Isl-1 ϩ neuron with long process. Scale bar, 100 m.  ... 
doi:10.1523/jneurosci.19-07-02601.1999 pmid:10087073 fatcat:u6iqebgzsfdwlokr423nuf2icq

An explorative qualitative study on acceptability of physical activity assessment instruments among primary care professionals in southern Sydney

Shona Nicole Dutton, Sarah May Dennis, Nicholas Zwar, Mark Fort Harris
2016 BMC Family Practice  
Availability of data and materials The dataset(s) supporting the conclusions of this article is (are) available on request from the primary author Shona Dutton E shona_dutton@hotmail.com.  ... 
doi:10.1186/s12875-016-0536-6 pmid:27658950 pmcid:PMC5034541 fatcat:gciupmvgs5hwhoqcby2glhy6me

Catalytic asymmetric endo-selective [3+2] cycloaddition reactions of Schiff bases of α-aminophosphonates with olefins using chiral metal amides

Yasuhiro Yamashita, Liang Cheng Nam, Mark J. Dutton, Susumu Yoshimoto, Shū Kobayashi
2015 Chemical Communications  
Chiral metal amide-catalyzed asymmetric endo-selective [3+2] cycloaddition reactions of Schiff bases of α-aminophosphonates with olefins are described.
doi:10.1039/c5cc07066j pmid:26389539 fatcat:uefid2hlw5fatghk2wbytlq6ra

Sea level variations during the last interglacial

Mark Siddall, RCA Hindmarsh, WG Thompson, A Dutton, RE Kopp, EJ Stone
2013 PAGES news  
Through an alternative deterministic approach, Dutton and Lambeck (2012) found very similar results with a range of 5.5 to 9 m.  ...  It is certainly worth considering which mechanisms may have driven such fluctuations, if they did indeed occur (Dutton and Lambeck 2012).  ... 
doi:10.22498/pages.21.1.36 fatcat:yukqfv7pxfhs7nwyps4y6cosum

High-Resolution Broadband N2 Coherent Anti-Stokes Raman Spectroscopy: Comparison of Measurements for Conventional And Modeless Broadband Dye Lasers

Joel P. Kuehner, Mark A. Woodmansee, Robert P. Lucht, J. Craig Dutton
2003 Applied Optics  
We have performed high-resolution N 2 coherent anti-Stokes Raman spectroscopy ͑CARS͒ measurements using a modeless dye laser ͑MDL͒ as the Stokes beam source to determine the effects of a reduction in mode noise on the accuracy and precision of the method. These results are compared with previous research that employed a conventional broadband dye laser ͑CBDL͒ as the Stokes beam source. A new spectral-fitting procedure was developed to avoid starting-point bias in the least-squares fitting
more » ... uares fitting results, which possibly had altered the previous measurements. Single-shot measurements of pressure were performed in a static-pressure vessel over the range of 0.1-4.0 atm to examine the pressure sensitivity of the technique. The precision of these measurements is a measure of the baseline noise level of the system, which sets the detection limit for flow-field pressure fluctuations. Centerline measurements of pressure and temperature in an underexpanded jet ͑M j ϭ 1.85͒ were also used to determine the performance of the technique in a compressible flow field. Our study represents the first known application, to our knowledge, of a MDL CARS system in a low-temperature, low-pressure supersonic environment. Improvements in accuracy for mean single-shot measurements and increased precision were found for pressure vessel conditions above 1.0 atm. For subatmospheric pressure vessel conditions ͑0.1-1.0 atm͒ and the underexpanded jet measurements, there was a decrease in accuracy and precision compared with the CBDL results. A comparison with the CBDL study is included, along with a discussion of the MDL system behavior.
doi:10.1364/ao.42.006757 pmid:14658480 fatcat:tipkkhr4hrc6bbi7t5pxgabgve

Anaplastic lymphoma kinase regulates binge-like drinking and dopamine receptor sensitivity in the ventral tegmental area

John W. Dutton, Hu Chen, Chang You, Mark S. Brodie, Amy W. Lasek
2016 Addiction Biology  
Dutton et al. Page 17 Figure 2. Dutton et al. Page 18 Addict Biol. Author manuscript; available in PMC 2018 May 01. Dutton et al. Page 25  ... 
doi:10.1111/adb.12358 pmid:26752591 pmcid:PMC4940304 fatcat:izro2fcoqrg3dmp54tpix7twlu

Magnetically controlled velocity selection in a cold-atom sample using stimulated Raman transitions

Matthew L. Terraciano, Spencer E. Olson, Mark Bashkansky, Zachary Dutton, Fredrik K. Fatemi
2007 Physical Review A. Atomic, Molecular, and Optical Physics  
We observe velocity-selective two-photon resonances in a cold atom cloud in the presence of a magnetic field. We use these resonances to demonstrate a simple magnetometer with sub-mG resolution. The technique is particularly useful for zeroing the magnetic field and does not require any additional laser frequencies than are already used for standard magneto-optical traps. We verify the effects using Faraday rotation spectroscopy.
doi:10.1103/physreva.76.053421 fatcat:tcwnttennvdnxhjsd6xhdxpqlu
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