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https://www.readbyqxmd.com/read/29261643/a-mildly-relativistic-wide-angle-outflow-in-the-neutron-star-merger-event-gw170817
#1
K P Mooley, E Nakar, K Hotokezaka, G Hallinan, A Corsi, D A Frail, A Horesh, T Murphy, E Lenc, D L Kaplan, K De, D Dobie, P Chandra, A Deller, O Gottlieb, M M Kasliwal, S R Kulkarni, S T Myers, S Nissanke, T Piran, C Lynch, V Bhalerao, S Bourke, K W Bannister, L P Singer
GW170817 was the first gravitational wave detection of a binary neutron-star merger1. It was accompanied by radiation across the electromagnetic spectrum and localized2 to the galaxy NGC 4993 at a distance of 40 megaparsecs. It has been proposed that the observed γ-ray, X-ray and radio emission is due to an ultra-relativistic jet launched during the merger, directed away from our line of sight3-6. The presence of such a jet is predicted from models that posit neutron-star mergers as the central engines that drive short hard γ-ray bursts7,8...
December 20, 2017: Nature
https://www.readbyqxmd.com/read/29239433/photophysical-properties-of-acetylene-linked-syn-bimane-oligomers-a-molecular-photonic-wire
#2
T S Chwee, Z C Wong, M B Sullivan, W Y Fan
Computational studies using correlated wave function methods and density functional theory were carried out on a series of acetylene-linked bimane oligomers with particular emphasis on their excitonic properties and implications for intra-chain excitation energy transfer (EET). The low energy barriers found for the rotation of bimane subunits about the longitudinal axis are such that the π-conjugation is easily disrupted. Nevertheless, a distinctive feature of the oligomer lies in the parallel alignment of the S1 transition dipole along the longitudinal axis, which sustains electronic coupling between adjacent bimane subunits over a range of torsional angles and is crucial for driving intra-chain EET...
December 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29217568/attosecond-resolved-photoionization-of-chiral-molecules
#3
S Beaulieu, A Comby, A Clergerie, J Caillat, D Descamps, N Dudovich, B Fabre, R Géneaux, F Légaré, S Petit, B Pons, G Porat, T Ruchon, R Taïeb, V Blanchet, Y Mairesse
Chiral light-matter interactions have been investigated for two centuries, leading to the discovery of many chiroptical processes used for discrimination of enantiomers. Whereas most chiroptical effects result from a response of bound electrons, photoionization can produce much stronger chiral signals that manifest as asymmetries in the angular distribution of the photoelectrons along the light-propagation axis. We implemented self-referenced attosecond photoelectron interferometry to measure the temporal profile of the forward and backward electron wave packets emitted upon photoionization of camphor by circularly polarized laser pulses...
December 8, 2017: Science
https://www.readbyqxmd.com/read/29191568/value-of-the-electrocardiographic-p-wave-t-wave-qrs-axis-as-a-predictor-of-mortality-in-14-years-in-a-population-with-a-high-prevalence-of-chagas-disease-from-the-bambu%C3%A3-cohort-study-of-aging
#4
Diego N Moraes, Bruno R Nascimento, Andrea Z Beaton, Elsayed Z Soliman, Maria Fernanda Lima-Costa, Rodrigo C P Dos Reis, Antonio Luiz P Ribeiro
We sought to investigate the prognostic value of the electrocardiogram (ECG) electrical axes (P wave, T wave and QRS) as predictors of mortality in the 14-year follow-up of the prospective cohort of all residents ≥60 years living in the southeastern Brazilian city of Bambuí, a population with high prevalence of Chagas disease (ChD). Baseline ECG axes were automatically measured with normal values defined as follows: P-wave axis 0° to 75°, QRS axis -30° to 90°, and T axis 15° to 75°. Participants underwent annual follow-up visits and death was verified using death certificates...
October 31, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/29166283/cardiac-disorders-in-dogs-infected-with-babesia-canis
#5
M Bartnicki, P Łyp, P Dębiak, M Staniec, S Winiarczyk, K Buczek, Ł Adaszek
The aim of this study was to assess cardiac disorders in dogs infected with B. canis. The study included 50 dogs with babesiosis and 20 healthy control animals. All the animals had haematological tests, ECG, echocardiography and serum troponin I and CK-MB levels checked. The haematology in the group of dogs with babesiosis confirmed thrombocytopaenia in 100% of dogs, decreased haematocrit in 52% and anaemia in 46%. The most common abnormalities in ECG and echocardiography in dogs infected with protozoa included: change in appearance and/or amplitude of the T-wave (34%), increased fractional shortening (24%), an increased sinus rhythm (14%) and heart axis deviation (10%)...
September 26, 2017: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/29163658/shear-wave-elastography-in-the-pronator-quadratus-muscle-following-distal-radial-fracture-fixation-a-feasibility-study-comparing-the-operated-versus-nonoperated-sides
#6
Christopher J Burke, James S Babb, Ronald S Adler
The aim of this study was to assess changes in shear wave velocity within the pronator quadratus muscle in patients following volar plate fixation for distal radial fractures compared to the contralateral nonoperated side. Shear wave velocity values were obtained in the short and long axis of the pronator quadratus muscle, which were analyzed separately. Patients were also stratified by age below or above 66 years. Statistical analysis was performed using paired sample Wilcoxon signed rank and t tests. Pearson and Spearman rank correlations were also used...
November 2017: Ultrasound: Journal of the British Medical Ultrasound Society
https://www.readbyqxmd.com/read/29158065/electrocardiographic-predictors-of-morbidity-and-mortality-in-patients-with-acute-myocarditis-the-importance-of-qrs-t-angle
#7
Shmuel Chen, Sarah Hoss, Vicki Zeniou, Ayelet Shauer, Dan Admon, Donna R Zwas, Chaim Lotan, Andre Keren, Israel Gotsman
BACKGROUND: Acute myocarditis carries a variable prognosis. We evaluated the morbidity and mortality rates in patients with acute myocarditis and admission electrocardiographic predictors of outcome. METHODS AND RESULTS: Patients admitted to a tertiary hospital with a clinical diagnosis of acute myocarditis were evaluated; 193 patients were included. Median follow-up was 5.7 years, 82% were male, and overal median age was 30 years (range 21-39). The most common clinical presentations were chest pain (77%) and fever (53%)...
January 2018: Journal of Cardiac Failure
https://www.readbyqxmd.com/read/29141844/architectural-t-wave-analysis-and-identification-of-on-therapy-breakthrough-arrhythmic-risk-in-type-1-and-type-2-long-qt-syndrome
#8
Alan Sugrue, Ram K Rohatgi, Peter A Noseworthy, Vaclav Kremen, J Martijn Bos, Bo Qiang, Yehu Sapir, Zachi I Attia, Christopher G Scott, Peter Brady, Samuel J Asirvatham, Paul A Friedman, Michael J Ackerman
BACKGROUND: Although the hallmark of long-QT syndrome (LQTS) is abnormal cardiac repolarization, there are varying degrees of phenotypic expression and arrhythmic risk. Our aim was to evaluate the performance of a morphological T-wave analysis program in defining breakthrough LQTS arrhythmic risk beyond the QTc value. METHODS AND RESULTS: We analyzed 407 genetically confirmed patients with LQT1 (n=246; 43% men) and LQT2 (n=161; 41% men) over the mean follow-up period of 6...
November 2017: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/29038372/a-radio-counterpart-to-a-neutron-star-merger
#9
G Hallinan, A Corsi, K P Mooley, K Hotokezaka, E Nakar, M M Kasliwal, D L Kaplan, D A Frail, S T Myers, T Murphy, K De, D Dobie, J R Allison, K W Bannister, V Bhalerao, P Chandra, T E Clarke, S Giacintucci, A Y Q Ho, A Horesh, N E Kassim, S R Kulkarni, E Lenc, F J Lockman, C Lynch, D Nichols, S Nissanke, N Palliyaguru, W M Peters, T Piran, J Rana, E M Sadler, L P Singer
Gravitational waves have been detected from a binary neutron star merger event, GW170817. The detection of electromagnetic radiation from the same source has shown that the merger occurred in the outskirts of the galaxy NGC 4993, at a distance of 40 megaparsecs from Earth. We report the detection of a counterpart radio source that appears 16 days after the event, allowing us to diagnose the energetics and environment of the merger. The observed radio emission can be explained by either a collimated ultra-relativistic jet viewed off-axis, or a cocoon of mildly relativistic ejecta...
October 16, 2017: Science
https://www.readbyqxmd.com/read/29038371/swift-and-nustar-observations-of-gw170817-detection-of-a-blue-kilonova
#10
P A Evans, S B Cenko, J A Kennea, S W K Emery, N P M Kuin, O Korobkin, R T Wollaeger, C L Fryer, K K Madsen, F A Harrison, Y Xu, E Nakar, K Hotokezaka, A Lien, S Campana, S R Oates, E Troja, A A Breeveld, F E Marshall, S D Barthelmy, A P Beardmore, D N Burrows, G Cusumano, A D'Aì, P D'Avanzo, V D'Elia, M de Pasquale, W P Even, C J Fontes, K Forster, J Garcia, P Giommi, B Grefenstette, C Gronwall, D H Hartmann, M Heida, A L Hungerford, M M Kasliwal, H A Krimm, A J Levan, D Malesani, A Melandri, H Miyasaka, J A Nousek, P T O'Brien, J P Osborne, C Pagani, K L Page, D M Palmer, M Perri, S Pike, J L Racusin, S Rosswog, M H Siegel, T Sakamoto, B Sbarufatti, G Tagliaferri, N R Tanvir, A Tohuvavohu
With the first direct detection of merging black holes in 2015, the era of gravitational wave (GW) astrophysics began. A complete picture of compact object mergers, however, requires the detection of an electromagnetic (EM) counterpart. We report ultraviolet (UV) and x-ray observations by Swift and the Nuclear Spectroscopic Telescope ARray (NuSTAR) of the EM counterpart of the binary neutron star merger GW 170817. The bright, rapidly fading ultraviolet emission indicates a high mass (≈ 0.03 solar masses) wind-driven outflow with moderate electron fraction (Ye ≈ 0...
October 16, 2017: Science
https://www.readbyqxmd.com/read/29036130/electromagnetic-diffraction-theory-of-refractive-axicon-lenses
#11
Yangyundou Wang, Shenggang Yan, Ari T Friberg, David Kuebel, Taco D Visser
We study the field that is produced by a paraxial refractive axicon lens. The results from geometrical optics, scalar wave optics, and electromagnetic diffraction theory are compared. In particular, the axial intensity, the on-axis effective wavelength, the transverse intensity, and the far-zone field are examined. A rigorous electromagnetic diffraction analysis shows that the state of polarization of the incident beam strongly affects the transverse intensity distribution, but not the intensity distribution in the far zone...
July 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28977056/electrocardiographic-findings-in-brazilian-adults-without-heart-disease-elsa-brasil
#12
Marcelo Martins Pinto, Luisa C C Brant, José Luiz Padilha-da-Silva, Murilo Foppa, Paulo A Lotufo, José Geraldo Mill, Paulo R Vasconcelo-Silva, Maria da Conceição C Almeida, Sandhi Maria Barreto, Antônio Luiz Pinho Ribeiro
BACKGROUND: The electrocardiogram (ECG) is widely used in population-based studies. However, there are few studies on electrocardiographic findings in Latin America and in Brazil. The Brazilian Longitudinal Study of Adult Health (ELSA-Brasil) comprised 15,105 participants (35-74 years) from six Brazilian capitals. OBJECTIVES: To describe electrocardiographic findings in Brazilian adults without heart disease, stratified by sex, age and race/skin color. METHODS: Cross-sectional study with baseline data of 11,094 adults (44...
November 2017: Arquivos Brasileiros de Cardiologia
https://www.readbyqxmd.com/read/28941601/refining-prediction-of-atrial-fibrillation-risk-in-the-general-population-with-analysis-of-p-wave-axis-from-the-atherosclerosis-risk-in-communities-study
#13
Ankit Maheshwari, Faye L Norby, Elsayed Z Soliman, Ryan Koene, Mary Rooney, Wesley T O'Neal, Alvaro Alonso, Lin Y Chen
Adverse atrial remodeling is associated with increased risk of atrial fibrillation (AF) and can be detected by a shift in P-wave axis. We aimed to determine whether an analysis of P-wave axis can be used to improve risk prediction of AF. We included 15,102 Atherosclerosis Risk in Communities Study participants who were free of AF at baseline. Abnormal P-wave axis (aPWA) was defined as any value outside 0 to 75 degrees on study visit 12-lead electrocardiograms. AF was determined using study visit electrocardiograms, death certificates, and hospital discharge records...
August 30, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28863167/the-development-and-validation-of-an-easy-to-use-automatic-qt-interval-algorithm
#14
Ben J M Hermans, Arja S Vink, Frank C Bennis, Luc H Filippini, Veronique M F Meijborg, Arthur A M Wilde, Laurent Pison, Pieter G Postema, Tammo Delhaas
BACKGROUND: To evaluate QT-interval dynamics in patients and in drug safety analysis, beat-to-beat QT-interval measurements are increasingly used. However, interobserver differences, aberrant T-wave morphologies and changes in heart axis might hamper accurate QT-interval measurements. OBJECTIVE: To develop and validate a QT-interval algorithm robust to heart axis orientation and T-wave morphology that can be applied on a beat-to-beat basis. METHODS: Additionally to standard ECG leads, the root mean square (ECGRMS), standard deviation and vectorcardiogram were used...
2017: PloS One
https://www.readbyqxmd.com/read/28802985/clinical-analysis-of-48-h-emergency-department-visit-post-outpatient-extracorporeal-shock-wave-lithotripsy-for-urolithiasis
#15
Chin-Heng Lu, Junne-Yih Kuo, Tzu-Ping Lin, Yi-Hsiu Huang, Hsiao-Jen Chung, William J S Huang, Howard H H Wu, Yen-Hwa Chang, Alex T L Lin, Kuang-Kuo Chen
BACKGROUND: Patients suffering from renal or ureteral stones can undergo significant discomfort, even when timely diagnosed and treated. The aim of this study was to assess the risk factors and safety of outpatient Extracorporeal Shock Wave Lithotripsy (ESWL) in the management of patients with renal or ureteral stones. METHODS: In this study, our cohort consisted of 844 outpatients who underwent outpatient ESWL treated between February 2012 and November 2014 at Taipei Veterans General Hospital...
August 9, 2017: Journal of the Chinese Medical Association: JCMA
https://www.readbyqxmd.com/read/28795324/the-fgf23-klotho-axis-and-cardiac-tissue-doppler-imaging-in-pediatric-chronic-kidney-disease-a-prospective-cohort-study
#16
Ylva Tranæus Lindblad, Hannes Olauson, Georgios Vavilis, Ulf Hammar, Maria Herthelius, Jonas Axelsson, Peter Bárány
BACKGROUND: Chronic kidney disease-associated mineral bone disorder (CKD-MBD) is common in pediatric kidney disease patients and a risk factor for future cardiovascular disease (CVD). Fibroblast growth factor-23 (FGF23) and Klotho are novel key players in CKD-MBD, and has been suggested to be involved in the development of CVD. METHODS: This prospective cohort study included 74 pediatric patients; 31 with CKD (age range 0.8-18.8 years, glomerular filtration rate (GFR) range 9-68 mL/min/1...
August 9, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/28772106/frontal-plane-t-wave-axis-orientation-predicts-coronary-events-findings-from-the-moli-sani-study
#17
Licia Iacoviello, Marialaura Bonaccio, Augusto Di Castelnuovo, Simona Costanzo, Livia Rago, Amalia De Curtis, Deodato Assanelli, Fabio Badilini, Martino Vaglio, Mariarosaria Persichillo, Peter W Macfarlane, Chiara Cerletti, Maria Benedetta Donati, Giovanni de Gaetano
BACKGROUND AND AIMS: The orientation of the frontal plane T-wave axis (T axis) is a reliable measure of ventricular repolarisation. We investigated the association between T-axis and the risk of coronary heart disease (CHD), heart failure (HF), atrial fibrillation (AF), stroke and cardiovascular (CVD) mortality. METHODS: A sample of 21,287 Moli-sani participants randomly recruited from the general adult (≥35 y) Italian population, free of CVD disease, were followed for a median of 4...
July 22, 2017: Atherosclerosis
https://www.readbyqxmd.com/read/28670188/an-uncommon-variant-of-an-uncommon-disease-a-caucasian-adolescent-with-apical-hypertrophic-cardiomyopathy-diagnosed-with-myocardial-perfusion-imaging
#18
Rami Kassem Zein, Zaid Al-Faham, Jason A Mouabbi, Edouard R Daher
Apical hypertrophic cardiomyopathy (ApHCM) is a subtype of HCM. This variant is more common in the Asian population when compared to North American patients. Patients may present with arrhythmias, heart failure, myocardial infarction, chest discomfort, fatigue, and presyncope or syncope. Initial evaluation requires electrocardiogram and two-dimensional echocardiogram. T-wave inversion in the precordial leads as well as hypertrophy of the left ventricle is hallmarks of the disease. Cardiac magnetic resonance (CMR) imaging is the most specific and sensitive imaging modality...
July 2017: World Journal of Nuclear Medicine
https://www.readbyqxmd.com/read/28628222/the-value-of-electrocardiography-in-prognosticating-clinical-deterioration-and-mortality-in-acute-pulmonary-embolism-a-systematic-review-and-meta-analysis
#19
REVIEW
Amro Qaddoura, Geneviève C Digby, Conrad Kabali, Piotr Kukla, Zhong-Qun Zhan, Adrian M Baranchuk
The role of electrocardiography (ECG) in prognosticating pulmonary embolism (PE) is increasingly recognized. ECG is quickly interpretable, noninvasive, inexpensive, and available in remote areas. We hypothesized that ECG can provide useful information about PE prognostication. We searched MEDLINE, EMBASE, Google Scholar, Web of Science, abstracts, conference proceedings, and reference lists through February 2017. Eligible studies used ECG to prognosticate for the main outcomes of death and clinical deterioration or escalation of therapy...
October 2017: Clinical Cardiology
https://www.readbyqxmd.com/read/28626057/abnormal-p-wave-axis-and-ischemic-stroke-the-aric-study-atherosclerosis-risk-in-communities
#20
Ankit Maheshwari, Faye L Norby, Elsayed Z Soliman, Ryan J Koene, Mary R Rooney, Wesley T O'Neal, Alvaro Alonso, Lin Y Chen
BACKGROUND AND PURPOSE: Abnormal P-wave axis (aPWA) has been linked to incident atrial fibrillation and mortality; however, the relationship between aPWA and stroke has not been reported. We hypothesized that aPWA is associated with ischemic stroke independent of atrial fibrillation and other stroke risk factors and tested our hypothesis in the ARIC study (Atherosclerosis Risk In Communities), a community-based prospective cohort study. METHODS: We included 15 102 participants (aged 54...
August 2017: Stroke; a Journal of Cerebral Circulation
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