We examine the properties of galaxies in the Galaxies and Mass Assembly (GAMA) survey located in voids with radii >10 h
−1 Mpc. Utilizing the GAMA equatorial survey, 592 void galaxies are identified ...out to z ≈ 0.1 brighter than M
r
= −18.4, our magnitude completeness limit. Using the W
Hα versus N ii/Hα (WHAN) line strength diagnostic diagram, we classify their spectra as star forming, AGN, or dominated by old stellar populations. For objects more massive than 5 × 109 M⊙, we identify a sample of 26 void galaxies with old stellar populations classed as passive and retired galaxies in the WHAN diagnostic diagram, else they lack any emission lines in their spectra. When matched to Wide-field Infrared Survey Explorer mid-IR photometry, these passive and retired galaxies exhibit a range of mid-IR colour, with a number of void galaxies exhibiting 4.6 − 12 colours inconsistent with completely quenched stellar populations, with a similar spread in colour seen for a randomly drawn non-void comparison sample. We hypothesize that a number of these galaxies host obscured star formation, else they are star forming outside of their central regions targeted for single-fibre spectroscopy. When matched to a randomly drawn sample of non-void galaxies, the void and non-void galaxies exhibit similar properties in terms of optical and mid-IR colour, morphology, and star formation activity, suggesting comparable mass assembly and quenching histories. A trend in mid-IR 4.6 − 12 colour is seen, such that both void and non-void galaxies with quenched/passive colours <1.5 typically have masses higher than 1010 M⊙, where internally driven processes play an increasingly important role in galaxy evolution.
ABSTRACT
We present observations of ASASSN-19dj, a nearby tidal disruption event (TDE) discovered in the post-starburst galaxy KUG 0810+227 by the All-Sky Automated Survey for Supernovae (ASAS-SN) at ...a distance of d ≃ 98 Mpc. We observed ASASSN-19dj from −21 to 392 d relative to peak ultraviolet (UV)/optical emission using high-cadence, multiwavelength spectroscopy and photometry. From the ASAS-SN g-band data, we determine that the TDE began to brighten on 2019 February 6.8 and for the first 16 d the rise was consistent with a flux ∝t2 power law. ASASSN-19dj peaked in the UV/optical on 2019 March 6.5 (MJD = 58548.5) at a bolometric luminosity of L = (6.2 ± 0.2) × 1044 erg s−1. Initially remaining roughly constant in X-rays and slowly fading in the UV/optical, the X-ray flux increased by over an order of magnitude ∼225 d after peak, resulting from the expansion of the X-ray emitting region. The late-time X-ray emission is well fitted by a blackbody with an effective radius of ∼1 × 1012 cm and a temperature of ∼6 × 105 K. The X-ray hardness ratio becomes softer after brightening and then returns to a harder state as the X-rays fade. Analysis of Catalina Real-Time Transient Survey images reveals a nuclear outburst roughly 14.5 yr earlier with a smooth decline and a luminosity of LV ≥ 1.4 × 1043 erg s−1, although the nature of the flare is unknown. ASASSN-19dj occurred in the most extreme post-starburst galaxy yet to host a TDE, with Lick HδA = 7.67 ± 0.17 Å.
Despite heightened awareness of the clinical significance of social phobia, information is still lacking about putative subtypes, functional impairment, and treatment-seeking. New epidemiologic data ...on these topics are presented from the National Comorbidity Survey Replication (NCS-R).
The NCS-R is a nationally representative household survey fielded in 2001-2003. The World Health Organization (WHO) Composite International Diagnostic Interview Version 3.0 (CIDI 3.0) was used to assess 14 performance and interactional fears and DSM-IV social phobia.
The estimated lifetime and 12-month prevalence of social phobia are 12.1% and 7.1% respectively. Performance and interactional fears load onto a single latent factor, and there is little evidence for distinct subtypes based either on the content or the number of fears. Social phobia is associated with significant psychiatric co-morbidity, role impairment, and treatment-seeking, all of which have a dose-response relationship with number of social fears. However, social phobia is the focus of clinical attention in only about half of cases where treatment is obtained. Among non-co-morbid cases, those with the most fears were least likely to receive social phobia treatment.
Social phobia is a common, under-treated disorder that leads to significant functional impairment. Increasing numbers of social fears are associated with increasingly severe manifestations of the disorder.
Objectives
The objective of this study was to investigate the quality of on‐plot piped water and rainwater at the point of consumption in an area with rapidly expanding coverage of ‘improved’ water ...sources.
Methods
Cross‐sectional study of 914 peri‐urban households in Kandal Province, Cambodia, between July–August 2011. We collected data from all households on water management, drinking water quality and factors potentially related to post‐collection water contamination. Drinking water samples were taken directly from a subsample of household taps (n = 143), stored tap water (n = 124), other stored water (n = 92) and treated stored water (n = 79) for basic water quality analysis for Escherichia coli and other parameters.
Results
Household drinking water management was complex, with different sources used at any given time and across seasons. Rainwater was the most commonly used drinking water source. Households mixed different water sources in storage containers, including ‘improved’ with ‘unimproved’ sources. Piped water from taps deteriorated during storage (P < 0.0005), from 520 cfu/100 ml (coefficient of variation, CV: 5.7) E. coli to 1100 cfu/100 ml (CV: 3.4). Stored non‐piped water (primarily rainwater) had a mean E. coli count of 1500 cfu/100 ml (CV: 4.1), not significantly different from stored piped water (P = 0.20). Microbial contamination of stored water was significantly associated with observed storage and handling practices, including dipping hands or receptacles in water (P < 0.005), and having an uncovered storage container (P = 0.052).
Conclusions
The microbial quality of ‘improved’ water sources in our study area was not maintained at the point of consumption, possibly due to a combination of mixing water sources at the household level, unsafe storage and handling practices, and inadequately treated piped‐to‐plot water. These results have implications for refining international targets for safe drinking water access as well as the assumptions underlying global burden of disease estimates, which posit that ‘improved’ sources pose minimal risks of diarrhoeal diseases.
Objectifs
Analyser la qualité de l'eau provenant de robinets dans les concessions et l'eau de pluie aux lieux de la consommation dans une zone en pleine expansion avec une couverture en sources d'eau «améliorées».
Méthodes
Une étude transversale portant sur 914 ménages périurbains dans la province de Kandal, au Cambodge, entre juillet et août 2011. Nous avons collecté des données dans tous les ménages sur la gestion de l'eau, la qualité de l'eau de boisson et les facteurs potentiellement liés à la contamination après la collecte de l'eau. Des échantillons d'eau potable ont été collectés directement à partir d'un sous‐échantillon de robinets des ménages (n = 143), de l'eau du robinet stockée (n = 124), de l'eau stockée provenant d'autres sources (n = 92) et de l'eau stockée traitée (n = 79), pour l'analyse de base de la qualité de l'eau pour E. coli et d'autres paramètres.
Résultats
La gestion de l'eau potable des ménages était complexe, avec différentes sources utilisées à chaque moment donné et selon les saisons. L'eau de pluie était la source d'eau potable la plus couramment utilisée. Les ménages mélangeaient de l'eau provenant de sources différentes dans des récipients de stockage, y compris celles de sources «améliorées» et «non améliorées». L'eau de robinets se détériorait au cours du stockage (p < 0,0005), avec des teneurs d’E. coli allant de 520 UFC/100 ml (coefficient de variation, CV: 5,7) à 1100 UFC/100 ml (CV: 3,4). L'eau stockée provenant de sources autres que le robinet (principalement l'eau de pluie) avait une teneur moyenne en E. coli de 1500 UFC/100 ml (CV: 4,1), ce qui n'est pas significativement différent de l'eau de robinet stockée (p = 0,20). La contamination microbienne de l'eau stockée était significativement associée aux pratiques de stockage et de manipulation observées, y compris le trempage des mains ou des récipients dans l'eau (p < 0,005) et le fait d'avoir un récipient de stockage non couvert (p = 0,052).
Conclusions
La qualité microbienne des sources d'eau «améliorées» dans notre zone d’étude n’était pas maintenue aux lieux de consommation, probablement en raison d'une combinaison du mélange d'eau de sources différentes à l’échelle des ménages, des pratiques de stockage et de manipulation à risque et d'eau de robinet des ménages inadéquatement traitée. Ces résultats ont des implications pour affiner les objectifs internationaux pour l'accès à l'eau potable ainsi que les hypothèses sous‐jacentes sur les estimations de la charge mondiale des maladies, qui postulent que les sources «améliorées» posent des risques réduits de maladies diarrhéiques.
Objetivos
Investigar la calidad del agua corriente y del agua de lluvia en el punto de consumo, en un área con una cobertura en rápida expansión de fuentes de agua “mejoradas.”
Métodos
Estudio croseccional de 914 hogares periurbanos en la Provincia de Kandal, Camboya, entre Julio‐Agosto 2011. Hemos recogido datos de todos los hogares sobre el manejo del agua, la calidad del agua potable, y los factores potencialmente relacionados con la contaminación del agua después de su recolección. Las muestras del agua potable se tomaron directamente de una submuestra de grifos de los hogares (n = 143), de agua corriente almacenada (n = 124), de otra agua almacenada (n = 92) y de agua almacenada tratada (n = 79) y se les realizaron análisis básicos para E. coli y otros parámetros.
Resultados
El manejo del agua potable de los hogares era complejo, con varias fuentes utilizadas al mismo tiempo y a lo largo de las estaciones. El agua de lluvia era la más comúnmente utilizada como fuente de agua para beber. Los hogares mezclaban en contenedores, para su almacenaje, agua proveniente de diferentes fuentes, incluyendo agua de fuentes “mejoradas” con agua de fuentes “sin mejorar”. El agua corriente obtenida a través de los grifos se deterioraba durante su almacenaje (p < 0.0005), de 520 ufc/100 ml (coeficiente de variación, CV: 5.7) E. coli a 1100 UFC/100 ml (CV: 3.4). El agua almacenada que no provenía de la red de tuberías (principalmente agua de lluvia), tenía un conteo de E. coli de 1500 ufc/100 ml (CV: 4.1), nada significativamente diferente al agua corriente almacenada (p = 0.20). La contaminación microbiana del agua almacenada estaba significativamente asociada con las prácticas de almacenamiento y de manejo observadas, que incluían el introducir las manos o recipientes dentro del agua (p < 0.005), o mantener el contenedor de almacenaje sin cubrir (p = 0.052).
Conclusiones
La calidad microbiana de las fuentes de agua “mejoradas” en nuestra área de estudio no se mantenía en el lugar de consumo, posiblemente debido a una combinación de mezclar las fuentes de agua dentro del hogar, un almacenamiento y prácticas de manejo poco seguras, y un agua corriente tratada inadecuadamente. Estos resultados tienen implicaciones a la hora de refinar los objetivos internacionales para el acceso a agua potable segura, al igual que los supuestos sobre los que se basan los cálculos de la carga global de la enfermedad diarreica, que postulan que las fuentes “mejoradas” de agua plantean un riesgo mínimo para la enfermedad diarreica.
Clustal W and Clustal X version 2.0 Larkin, M.A.; Blackshields, G.; Brown, N.P. ...
Bioinformatics,
11/2007, Letnik:
23, Številka:
21
Journal Article
Recenzirano
Odprti dostop
The Clustal W and Clustal X multiple sequence alignment programs have been completely rewritten in C++. This will facilitate the further development of the alignment algorithms in the future and has ...allowed proper porting of the programs to the latest versions of Linux, Macintosh and Windows operating systems. Availability: The programs can be run on-line from the EBI web server: http://www.ebi.ac.uk/tools/clustalw2. The source code and executables for Windows, Linux and Macintosh computers are available from the EBI ftp site ftp://ftp.ebi.ac.uk/pub/software/clustalw2/ Contact: clustalw@ucd.ie
Circumstellar disks are thought to experience a rapid 'transition' phase in their evolution that can have a considerable impact on the formation and early development of planetary systems. We present ...new and archival high angular resolution (03 40-75 AU) Submillimeter Array (SMA) observations of the 880 Delta *mm (340 GHz) dust continuum emission from 12 such transition disks in nearby star-forming regions. In each case, we directly resolve a dust-depleted disk cavity around the central star. Using two-dimensional Monte Carlo radiative transfer calculations, we interpret these dust disk structures in a homogeneous, parametric model framework by reproducing their SMA continuum visibilities and spectral energy distributions. The cavities in these disks are large (R cav = 15-73 AU) and substantially depleted of small (~ Delta *mm-sized) dust grains, although their mass contents are still uncertain. The structures of the remnant material at larger radii are comparable to normal disks. We demonstrate that these large cavities are relatively common among the millimeter-bright disk population, comprising at least 1 in 5 (20%) of the disks in the bright half (and >=26% of the upper quartile) of the millimeter luminosity (disk mass) distribution. Utilizing these results, we assess some of the physical mechanisms proposed to account for transition disk structures. As has been shown before, photoevaporation models do not produce the large cavity sizes, accretion rates, and disk masses representative of this sample. A sufficient decrease of the dust optical depths in these cavities by particle growth would be difficult to achieve: substantial growth (to meter sizes or beyond) must occur in large (tens of AU) regions of low turbulence without also producing an abundance of small particles. Given those challenges, we suggest instead that the observations are most commensurate with dynamical clearing due to tidal interactions with low-mass companions--very young (~1 Myr) brown dwarfs or giant planets on long-period orbits.
Bad metallic transport in a cold atom Fermi-Hubbard system Brown, Peter T; Mitra, Debayan; Guardado-Sanchez, Elmer ...
Science (American Association for the Advancement of Science),
01/2019, Letnik:
363, Številka:
6425
Journal Article
Recenzirano
Odprti dostop
Strong interactions in many-body quantum systems complicate the interpretation of charge transport in such materials. To shed light on this problem, we study transport in a clean quantum system: ...ultracold
Li in a two-dimensional (2D) optical lattice, a testing ground for strong interaction physics in the Fermi-Hubbard model. We determine the diffusion constant by measuring the relaxation of an imposed density modulation and modeling its decay hydrodynamically. The diffusion constant is converted to a resistivity using the Nernst-Einstein relation. That resistivity exhibits a linear temperature dependence and shows no evidence of saturation, two characteristic signatures of a bad metal. The techniques we develop here may be applied to measurements of other transport quantities, including the optical conductivity and thermopower.
The performance of tracheotomy is a common procedural request by critical care departments to the surgical services of general surgery, thoracic surgery and otolaryngology - head & neck surgery. A ...Canadian Society of Otolaryngology - Head & Neck Surgery (CSO-HNS) task force was convened with multi-specialty involvement from otolaryngology-head & neck surgery, general surgery, critical care and anesthesiology to develop a set of recommendations for the performance of tracheotomies during the COVID-19 pandemic.
The tracheotomy procedure is highly aerosol generating and directly exposes the entire surgical team to the viral aerosol plume and secretions, thereby increasing the risk of transmission to healthcare providers. As such, we believe extended endotracheal intubation should be the standard of care for the entire duration of ventilation in the vast majority of patients. Pre-operative COVID-19 testing is highly recommended for any non-emergent procedure.
The set of recommendations in this document highlight the importance of avoiding tracheotomy procedures in patients who are COVID-19 positive if at all possible. Recommendations for appropriate PPE and environment are made for COVID-19 positive, negative and unknown patients requiring consideration of tracheotomy. The safety of healthcare professionals who care for ill patients and who keep critical infrastructure operating is paramount.
The Galaxy And Mass Assembly (GAMA) survey furnishes a deep redshift catalog that, when combined with the Wide-field Infrared Survey Explorer (WISE), allows us to explore for the first time the ...mid-infrared properties of > 110,000 galaxies over 120 deg super(2) to z Asymptotically = to 0.5. In this paper we detail the procedure for producing the matched GAMA-WISE catalog for the G12 and G15 fields, in particular characterizing and measuring resolved sources; the complete catalogs for all three GAMA equatorial fields will be made available through the GAMA public releases. The wealth of multiwavelength photometry and optical spectroscopy allows us to explore empirical relations between optically determined stellar mass (derived from synthetic stellar population models) and 3.4 mu m and 4.6 mu m WISE measurements. Similarly dust-corrected H alpha -derived star formation rates can be compared to 12 mu m and 22 mu m luminosities to quantify correlations that can be applied to large samples to z < 0.5. To illustrate the applications of these relations, we use the 12 mu m star formation prescription to investigate the behavior of specific star formation within the GAMA-WISE sample and underscore the ability of WISE to detect star-forming systems at z ~ 0.5. Within galaxy groups (determined by a sophisticated friends-of-friends scheme), results suggest that galaxies with a neighbor within 100 h super(-1) kpc have, on average, lower specific star formation rates than typical GAMA galaxies with the same stellar mass.
Measurement of the evolution of both active galactic nuclei (AGN) and star-formation in galaxies underpins our understanding of galaxy evolution over cosmic time. Radio continuum observations can ...provide key information on these two processes, in particular via the mechanical feedback produced by radio jets in AGN, and via an unbiased dust-independent measurement of star formation rates. In this paper, we determine radio luminosity functions at 325 MHz for a sample of AGN and star-forming galaxies by matching a 138 deg2 radio survey conducted with the Giant Metrewave Radio Telescope, with optical imaging and redshifts from the Galaxy And Mass Assembly survey. We find that the radio luminosity function at 325 MHz for star-forming galaxies closely follows that measured at 1.4 GHz. By fitting the AGN radio luminosity function out to z = 0.5 as a double power law, and parametrizing the evolution as Φ ∝ (1 + z)
k
, we find evolution parameters of k = 0.92 ± 0.95 assuming pure density evolution and k = 2.13 ± 1.96 assuming pure luminosity evolution. We find that the Low Excitation Radio Galaxies are the dominant population in space density at lower luminosities. Comparing our 325 MHz observations with radio continuum imaging at 1.4 GHz, we determine separate radio luminosity functions for steep- and flat-spectrum AGN, and show that the beamed population of flat-spectrum sources in our sample can be shifted in number density and luminosity to coincide with the unbeamed population of steep-spectrum sources, as is expected in the orientation-based unification of AGN.
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