bluuebunny/crossref_metadata_2025_split huggingface dataset:
Clinical outcome and risk stratification in Brugada syndrome
Authors: Wada Tadashi , Morita Hiroshi 
Published: March 2013

AbstractSince the first report on Brugada syndrome, various risk markers for the prediction of ventricular fibrillation (VF) in patients with Brugada syndrome have been reported. Multicenter trials reported spontaneous type 1 electrocardiogram (ECG) and disease symptoms as prognostic predictors. VF induction by programmed electrical stimulation is still controversial, and most of the studies have failed to prove its significance for the prediction of spontaneous VF episodes. In Japan, although most multicenter studies have shown that patients with type 1 ECG were at high risk, it is difficult to determine the indication for implantation of an implantable cardioverter defibrillator only based on the ECG type. Recent studies have added new risk markers, such as inferolateral early repolarization, fragmented QRS, and shorter effective refractory periods of the ventricle, in addition to type 1 ECG and symptoms. Here, we review the clinical outcome and indices reported as reliable prognostic factors of Brugada syndrome with a focus on the clinical and ECG markers for risk stratification.
Perioperative management of anticoagulation in patients on warfarin therapy undergoing surgery for cardiac implantable electronic devices
Authors: Zhu Dennis Weixi , Ahmed Imdad 
Published: March 2013

AbstractMany patients on chronic warfarin therapy are undergoing surgery for permanent pacemakers and implantable defibrillators, collectively known as cardiac implantable electronic device (CIED). The perioperative management of anticoagulation in these patients is a challenging clinical situation that requires balance between the risk of acute thrombosis and perioperative hemorrhage. This issue however, is inadequately addressed in the guidelines published by professional organizations. Increasing evidence suggests that temporarily interrupting anticoagulation is associated with a small but real thromboembolic risk, whereas cessation of warfarin with heparin bridging anticoagulation frequently leads to a higher incidence of pocket hematoma. Continuing warfarin with a therapeutic international normalized ratio appears to be a safe and cost‐effective approach for CIED surgery in most patients with moderate to high thromboembolic risk. An algorithm is proposed for the practical management of anticoagulation and antiplatelet therapy in these patients during the perioperative period.
Electrodiagnosis in Persons With Amyotrophic Lateral Sclerosis
Authors: Joyce Nanette C. , Carter Gregory T. 
Published: March 2013

AbstractElectrophysiology remains an important tool in the evaluation of patients presenting with signs and symptoms of motor neuron disease. The electrodiagnostic study should include peripheral nerve conduction studies and needle electromyography to both exclude treatable disease and gather evidence regarding a diagnosis of amyotrophic lateral sclerosis (ALS). The recent changes in the revised El Escorial criteria, recommended by the Awaji‐shima consensus group, have increased the diagnostic significance of fasciculation potentials to equal that of fibrillation and positive sharp‐wave potentials in the needle electromyography examination of patients suspected of having ALS. In addition, electrophysiologic evidence is now considered equivalent to clinical signs and symptoms in reaching a diagnostic certainty of ALS. These changes, strategies for the design, and implementation of an effective electrodiagnostic evaluation, in addition to electrophysiologic techniques and their relationship to the evaluation of a patient with ALS, are reviewed and discussed.
Black Doctors and Discrimination under South Africa’s Apartheid Regime
Authors: Digby Anne 
Published: March 2013

AbstractThis article discusses an under-researched group and provides an analytical overview of the comparative experiences of African, Indian and Coloured doctors at South African universities during the apartheid era. It probes diversity of experience in training and practice as well as gendered differentiation amongst black students before going on to discuss the careers and political activism of black doctors as well as the impact of recent transformational change on their position. It briefly assesses how singular this South African experience was.
On derivations and elementary operators onC*-algebras
Authors: Gogić Ilja 
Published: March 2013

AbstractLetAbe a unitalC*-algebra with the canonical (H)C*-bundle$\mathfrak{A}$over the maximal ideal space of the centre ofA, and letE(A)be the set of all elementary operators onA. We consider derivations onAwhich lie in the completely bounded norm closure ofE(A), and show that such derivations are necessarily inner in the case when each fibre of$\mathfrak{A}$is a primeC*-algebra. We also consider separableC*-algebrasAfor which$\mathfrak{A}$is an (F) bundle. For theseC*-algebras we show that the following conditions are equivalent:E(A)is closed in the operator norm;Aas a Banach module over its centre is topologically finitely generated; fibres of$\mathfrak{A}$have uniformly finite dimensions, and each restriction bundle of$\mathfrak{A}$over a set where its fibres are of constant dimension is of finite type as a vector bundle.
Chicxulub impact spherules in the North Atlantic and Caribbean: age constraints and Cretaceous–Tertiary boundary hiatus
Authors: KELLER GERTA , KHOZYEM HASSAN , ADATTE THIERRY , MALARKODI NALLAMUTHU , SPANGENBERG JORGE E. , STINNESBECK WOLFGANG 
Published: March 2013

AbstractThe Chicxulub impact is commonly believed to have caused the Cretaceous–Tertiary boundary mass extinction and a thin impact spherule layer in the North Atlantic and Caribbean is frequently cited as proof. We evaluated this claim in the seven best North Atlantic and Caribbean Cretaceous–Tertiary boundary sequences based on high-resolution biostratigraphy, quantitative faunal analyses and stable isotopes. Results reveal a major Cretaceous–Tertiary boundary unconformity spanning most of Danian subzone P1a(1) and Maastrichtian zones CF1–CF2 (~400 ka) in the NW Atlantic Bass River core, ODP Sites 1049A, 1049C and 1050C. In the Caribbean ODP Sites 999B and 1001B the unconformity spans from the early Danian zone P1a(1) through to zones CF1–CF4 (~3 Ma). Only in the Demerara Rise ODP Site 1259B is erosion relatively minor and restricted to the earliest Danian zone P0 and most of subzone P1a(1) (~150 ka). In all sites examined, Chicxulub impact spherules are reworked into the early Danian subzone P1a(1) about 150–200 ka after the mass extinction. A similar pattern of erosion and redeposition of impact spherules in Danian sediments has previously been documented from Cuba, Haiti, Belize, Guatemala, south and central Mexico. This pattern can be explained by intensified Gulf stream circulation at times of climate cooling and sea level changes. The age of the Chicxulub impact cannot be determined from these reworked impact spherule layers, but can be evaluated based on the stratigraphically oldest spherule layer in NE Mexico and Texas, which indicates that this impact predates the Cretaceous–Tertiary boundary by about 130–150 ka.
A new species ofMarionia(Opisthobranchia: Nudibranchia: Tritoniidae) from the tropical South Atlantic Ocean
Authors: De Vasconcelos Silva Felipe , Oliveira de Meirelles Carlos Augusto , Matthews-Cascon Helena 
Published: March 2013

A new species of the family Tritoniidae is described for the tropical South Atlantic Ocean. The animal was found off north-east Brazil.Marionia limceanasp. nov. is up to 31 mm long, with a sturdy white body, of which the notum is covered with two rows of red polygons running from the rhinophores to the tail; notum with tubers; bi-lobed veil with 16 velar papillae; retractable white rhinophores; 11–14 pairs of branchial plumes; the anus is located below the 4th gill on the right side, and the genital opening is under the 3rd gill. Internally,M. limceanasp. nov. is distinguished from other tritoniids by jaws with three or four rows of denticles on the inner lips, a belt of 18 stomach plates; and the radular formula 26 × 26–32.1.1.1.26–32 teeth. The animal was found feeding on octocorals of a species of the new genusStragulum, and is the first reported nudibranch to feed on this genus.
Star Formation in the Molecular Cloud Associated with the Monkey Head Nebula: Sequential or Spontaneous?
Authors: Chibueze J. O. , Imura K. , Omodaka T. , Handa T. , Nagayama T. , Fujisawa K. , Sunada K. , Nakano M. , Kamezaki T. , Yamaguchi Y. 
Published: March 2013

AbstractWe mapped the NH3 (1,1), (2,2), and (3,3) lines of the molecular cloud associated with the Monkey Head Nebula (MHN) with 1′.6 angular resolution using Kashima 34 m telescope. Its kinetic temperature distribution was contrary to what is expected for a molecular cloud at the edge of an expanding H II region and suggested that the massive star associated with S252A compact HII region formed spontaneously rather than through a sequential process.
Birthplace of 6.7 GHz methanol masers
Authors: Gan Cong-Gui , Chen Xi , Shen Zhi-Qiang 
Published: March 2013

AbstractWe performed polarization sensitive VLBI observations of 6.7 GHz methanol masers toward high-mass young stellar objects with clear outflow seen from Spitzer IRAC images in the 4.5 μm band (i.e. EGOs, see Cyganowski et al. 2008) with the EVN to investigate the birthplace of the masers. By comparing direction of the major axis of methanol maser distributions with directions of higher resolution outflow and magnetic field vector, we suggest that the methanol masers toward source G28.83-0.25 may arise from surrounding disk.
Gas Content in the GMC G333: hierarchical structure of turbulence
Authors: Lo N. , Cunningham M. R. , Jones P. A. , Bronfman L. 
Published: March 2013

AbstractWe present our preliminary results on the application of dendrogram statistics to the carbon monoxide PPV map of the giant molecular cloud G333. We obtain the dendrograms at various merging levels and found the clustering of branches is independent from the merging levels. The statistics of intensity distributions show gravity is possibly significant in this cloud and the gas may be sonic. Application of this method to other molecular lines data are required for further analysis of the cloud properties.
Ammonia towards dust clumps in the giant molecular cloud associated with RCW 106
Authors: Lowe Vicki , Cunningham Maria R. , Urquhart James S. , Horiuchi Shinji 
Published: March 2013

AbstractHigh-mass stars are known to be born within giant molecular clouds (GMCs); However, the exact processes involved in forming a high-mass star are still not well understood. It is clear that high-mass stars do not form in isolation, and that the processes surrounding high-mass star formation may affect the environment of the entire molecular cloud. We are studying the GMC associated with RCW 106 (G333), which is one of the most active massive-star formation regions in the Galactic plane. This GMC, located at l = 333° b = − 0.5°, has been mapped in over 20 molecular line transitions with the Mopra radio telescope (83-110 GHz), in Australia, and with the Swedish-ESO Submillimeter Telescope (SEST) in the 1.2 mm cool dust continuum. The region is also within the Spitzer GLIMPSE infrared survey (3.6, 4.5, 5.8, and 8.0 μm) area. We have decomposed the dust continuum using a clump-finding algorithm (CLUMPFIND), and are using the multiple molecular line traditions from the Mopra radio telescope to classify the type and stage of star formation taking place therein. Having accurate physical temperatures of the star forming clumps is essential to constrain other parameters to within useful limits. To achieve this, we have obtained pointed NH3 observations from the Tidbinbilla 70-m radio telescope, in Australia, towards these clumps.
Early stage of star formation in Orion KL
Authors: Matveyenko Leonid I. , Sivakon Stanislav S. , Demichev Vasily A. , Graham David A. , Diamond Phillip J. , Abrahamyan Martin G. 
Published: March 2013

AbstractSuper H2O outbursts accompany star formation. We have been studying this phenomenon in Orion KL starting in 1971.8.
Propagation of Highly Efficient Star Formation in the North American Nebula (NGC 7000)
Authors: Toujima Hideyuki , Handa Toshihiro , Omodaka Toshihiro , Nagayama Takumi , Kobayashi Hideyuki , Koyama Yasuhiro 
Published: March 2013

AbstractWe mapped the molecular cloud associated with the North American Nebula in the NH3 lines and the H2O maser using the Kashima 34-m telescope. The line ratio shows the molecular gas is cold. For the clumps and subclumps in the cloud we also estimate the star forming efficiency (SFE). The east end of the cloud shows the highest SEF, 0.62, and the other end is the lowest, 0.06. The 3 dimensional structure derived using the published Hα map suggests the east end is in the HII region and it should be a reason why the SFE is high there.
The Supershell-Molecular Cloud Connection in the Milky Way and Beyond
Authors: Dawson J. R. , McClure-Griffiths N. M. , Fukui Y. , Dickey J. , Wong T. , Hughes A. , Kawamura A. 
Published: March 2013

AbstractThe role of large-scale stellar feedback in the formation of molecular clouds has been investigated observationally by examining the relationship between Hi and 12CO(J = 1−0) in supershells. Detailed parsec-resolution case studies of two Milky Way supershells demonstrate an enhanced level of molecularisation over both objects, and hence provide the first quantitative observational evidence of increased molecular cloud production in volumes of space affected by supershell activity. Recent results on supergiant shells in the LMC suggest that while they do indeed help to organise the ISM into over-dense structures, their global contribution to molecular cloud formation is of the order of only ∼ 10%.
From Gas to Stars: Simulating a Population of GMCs
Authors: Goldbaum Nathan J. , Krumholz Mark R. 
Published: March 2013

AbstractHere, we present a theoretical model for the global evolution of isolated giant molecular clouds. Accounting for the amount of mass, momentum, and energy supplied by accretion and star formation feedback, we are able to follow the growth, evolution, and dispersal of individual GMCs. We compare our models to observations of GMCs and associated young star clusters in the Large Magellanic Cloud and find good agreement between our model clouds and the observed relationship between Hii regions, young star clusters, and GMCs.
Young Stellar Objects in the Low-Metallicity Small Magellanic Cloud
Authors: Sewiło M. , Carlson L. R. , Seale J. P. , Indebetouw R. , Meixner M. , Whitney B. A. , Robitaille T. R. , Oliveira J. M. , Gordon K. 
Published: March 2013

AbstractThe Spitzer Legacy Program “Surveying the Agents of Galaxy Evolution in the Tidally-Stripped, Low-Metallicity Small Magellanic Cloud” (SAGE-SMC; Gordon et al. 2011) allows a global study of star formation in the SMC at high enough resolution to resolve individual cores and protostars at a range of mid-IR wavelengths. Using the SAGE-SMC IRAC (3.6 - 8.0 μm) and MIPS (24 and 70 μm) catalogs and images combined with the near-IR and optical data, we identified a population of ∼1100 intermediate- to high-mass Young Stellar Objects (YSOs) in the SMC (3 × more than previously known). We investigate the properties of the YSOs and how they relate to the galaxy's structure and gas and dust distribution.
Pattern analysis of young stellar clusters
Authors: Tóth L. Viktor , Zahorecz Sarolta , Marton Gábor , Onishi Toshikazu , Balázs Lajos G. , Fehér Orsolya , Kawamura Akiko , Kitamura Yoshimi , Lisztes Mónika , Nishimura Atsushi , Pásztor László , Pintér Sándor , Racz Istvan , Tamura Motohide , Ueno Munetaka 
Published: March 2013

AbstractWe revealed a statistically significant clustering in the all sky distribution of AKARI-WISE young stellar objects with large groups of elongated and bush types.
The Environmental Effect of the CMF in the Galactic Center 50 km s−1 Molecular Cloud
Authors: Tsuboi Masato , Miyazaki Atsushi 
Published: March 2013

AbstractWe present the statistical properties of molecular clumps in the Galactic center 50 km s−1 molecular cloud based on observations of the CS J = 1 − 0 emission line with the Nobeyama Millimeter Array. The CMF and size spectrum for the whole cloud can be described by power laws of dN/dM ∝ M−2.6 ± 0.1 and dN/dR ∝ R−5.9±0.3, respectively. The CMF observed in the interacting part with the Sgr A East steepens to dN/dM ∝ M−4.0±0.2. On the other hand, the interaction presumably truncates the size spectrum on the larger side of R ∼ 0.4 pc.
The detailed nature of active central cluster galaxies
Authors: Loubser S. I. , Soechting I. K. 
Published: March 2013

AbstractWe present detailed integral field unit observations of the central few kiloparsecs of the ionized nebulae surrounding four active central cluster galaxies (CCGs) in cooling flow clusters (Abell 0496, 0780, 1644 and 2052). Our sample consists of CCGs with Hα filaments, and have existing data from the X-ray to radio wavelength regimes available, but lacked the detailed optical emission-line (and simultaneous absorption line) data over a broad wavelength range to probe the dominant ionisation processes, excitation sources, morphology and kinematics of the hot gas (as well as the morphology and kinematics of the stars). This, combined with the other multiwavelength data, will form a complete view of the different phases (hot and cold gas and stars) and how they interact in the processes of star formation and feedback detected in central galaxies in cooling flow clusters, as well as the influence of the host cluster. We derive the optical dust extinction maps of the four nebulae. We also derive a range of different kinematic properties, given the small sample size. For Abell 0496 and 0780, we find that the stars and gas are kinematically decoupled, and in the case of Abell 1644 we find that these components are aligned. For Abell 2052, we find that the gaseous components show rotation even though no rotation is apparent in the stellar components. To the degree that our spatial resolution reveals, it appears that all the optical forbidden and hydrogen recombination lines originate in the same gas for all the galaxies. Based on optical diagnostic ratios ([OIII]λ5007/Hβ against [NII]λ6584/Hα, [SII]λ6717,6731/Hα, and [OI]λ6300/Hα), all objects contain a LINER nucleus and show extended LINER-like gas emission. We also show that the hardness of the ionizing continuum does not decrease radially within our field-of-view as the emission line ratios do not vary significantly with radius, thus the derived nebular properties are spatially homogeneous. We fit AGN and pAGB stars photoionisation models as well as shock excitation models to our derived diagnostic ratios. We suggest that AGN photoionisation is the most likely ionisation mechanism even though shocks and pAGB stars can not be conclusively eliminated.
Internal kinematics and physical properties of HII regions in the Arp 270 system
Authors: Zaragoza Javier , Font Joan , Blasco Javier , Beckman John E. , García Begoña 
Published: March 2013

AbstractWe have observed Arp 270 using the GHαFaS Fabry-Perot spectrometer on the 4.2m William Herschel Telescope (La Palma). In the edge-on companion we detect a radial gas inflow of ∼ 0.36 M⊙/yr to the centre and also an axially confined outflow of ∼ 0.24 M⊙/yr from the nucleus in two opposing directions. We find two different behaviors between the physical properties of the HII regions. We suggest as a possible explanation a sub and supersonic regime.
The Connection between Starburst and AGN Activities Probed with the 3.3μm PAH Emission
Authors: Kim Ji Hoon , Im M. , Woo J.-H. , Kim D. 
Published: March 2013

AbstractWe investigated the connection between AGN and star formation (SF) activities of various kinds of AGNs and their host galaxies. In order to probe SF activity, we measured the 3.3 μm PAH emission luminosity utilizing the slitless spectroscopic capability of AKARI space telescope. We present the results from two missions, ASCSG and LQSONG.
The molecular gas properties in external galaxies
Authors: Bayet E. , Viti S. , Bureau M. , Aladro R. , Williams D. , Davis T. , Martin S. , Young L. , Crocker A. 
Published: March 2013

AbstractWe present a summary of the physical and chemical properties we have obtained for the molecular gas found in galaxies, an essential triggering ingredient to any star formation (SF) process. In particular, we focus our studies on the molecular gas phases as traced by CO, HCO+ and CS line emissions, in a sample of galaxies including starbursts -SBs-, irregulars galaxies, low-metallicity sources, normal spirals, mergers, Early Type Galaxies (ETGs), galaxies with an Active Galactic Nucleus (AGN), with Cosmic Ray Dominated Regions (CRDRs) and with Photo-Dominated Regions (PDRs). Our studies mix theoretical developments (i.e. computational models) with the acquisition of large observational datatsets (at both low and high spatial resolution) that we then compare in order to better determine the conditions under which some SF activity is starting and/or is maintained.
Experiments on molecular hydrogen formation on cold ISM dust
Authors: Gavilan Lisseth , Lemaire Jean Louis , Vidali Gianfranco 
Published: March 2013

AbstractWe investigate the formation of molecular hydrogen on ISM dust grains at T < 10 K. We use laboratory methods to detect newly formed D2 that is rovibrationally excited at v” = 4, J” = 2. We discover that recombination is catalyzed by pre-existing molecules on the dust surface and present this an important process in the coldest regions of the ISM.