1,545 research outputs found
A Cosmic Census of Radio Pulsars with the SKA
The Square Kilometre Array (SKA) will make ground breaking discoveries in
pulsar science. In this chapter we outline the SKA surveys for new pulsars, as
well as how we will perform the necessary follow-up timing observations. The
SKA's wide field-of-view, high sensitivity, multi-beaming and sub-arraying
capabilities, coupled with advanced pulsar search backends, will result in the
discovery of a large population of pulsars. These will enable the SKA's pulsar
science goals (tests of General Relativity with pulsar binary systems,
investigating black hole theorems with pulsar-black hole binaries, and direct
detection of gravitational waves in a pulsar timing array). Using SKA1-MID and
SKA1-LOW we will survey the Milky Way to unprecedented depth, increasing the
number of known pulsars by more than an order of magnitude. SKA2 will
potentially find all the Galactic radio-emitting pulsars in the SKA sky which
are beamed in our direction. This will give a clear picture of the birth
properties of pulsars and of the gravitational potential, magnetic field
structure and interstellar matter content of the Galaxy. Targeted searches will
enable detection of exotic systems, such as the ~1000 pulsars we infer to be
closely orbiting Sgr A*, the supermassive black hole in the Galactic Centre. In
addition, the SKA's sensitivity will be sufficient to detect pulsars in local
group galaxies. To derive the spin characteristics of the discoveries we will
perform live searches, and use sub-arraying and dynamic scheduling to time
pulsars as soon as they are discovered, while simultaneously continuing survey
observations. The large projected number of discoveries suggests that we will
uncover currently unknown rare systems that can be exploited to push the
boundaries of our understanding of astrophysics and provide tools for testing
physics, as has been done by the pulsar community in the past.Comment: 20 pages, 7 figures, to be published in: "Advancing Astrophysics with
the Square Kilometre Array", Proceedings of Science, PoS(AASKA14)04
Advances in the knowledge of the inocybe mixtilis group (Inocybaceae, Agaricomycetes), through molecular and morphological studies
Inocybe mixtilis constitutes a complex of species characterized by nodulose-angulose spores, absence of cortina and a more or less bulbous marginate stipe that is not darkening when desiccated. In order to elucidate species limits within the I. mixtilis complex, an ITS-RPB2 phylogeny was performed and interpreted using morphological and ecological characters. Six supported clades were obtained in our analyses that correspond to I. mixtilis, I. subtrivialis, and four new species to science: I. ceskae, I. johannis-stanglii, I. nothomixtilis and I. occulta. Species within this complex can be morphologically recognized through a unique combination of morphological characters, such as the spore shape, cystidial length and shape, presence and development of the velipellis and pileus colour and viscidity. Nevertheless, those characters overlap, especially among I. mixtilis, I. ceskae and I. occulta, and intermediate collections are therefore more reliably identified through ITS-sequencing. Two species, I. ceskae and I. occulta are present in both North America and Europe, while the rest are so far only known in Europe, or Europe and Asia (I. mixtilis). All species, except I. johannis-stanglii, seem to be able to establish ectomycorrhizal association both with conifers and angiosperms. Descriptions, colour illustrations and a key to all known species in the I. mixtilis group are provided
Miet- und Immobilienpreissteigerungen: Droht eine Immobilienblase?
Deuten die aktuellen Preisanstiege auf den ImmobilienmĂ€rkten auf eine Immobilienblase hin? FĂŒr Andreas Dombret, Deutsche Bundesbank, gehören Preisblasen an ImmobilienmĂ€rkten zu den gröĂten Risiken fĂŒr die FinanzstabilitĂ€t. Die Folgen derartiger Ăbertreibungen könnten FinanzintermediĂ€re in Schieflage bringen und die Realwirtschaft nachhaltig schwĂ€chen. In Deutschland sieht er aber bisher keinen raschen Aufbau dieser Risiken fĂŒr die FinanzstabilitĂ€t, insbesondere aufgrund der robusten SchuldentragfĂ€higkeit der privaten Haushalte, des moderaten Kreditwachstums sowie der konservativen Kreditvergabestandards. Nach Ansicht von Reiner Braun, empirica AG, besteht solange ein Restrisiko monetĂ€rer Blasen, wie der »Kern« des Problems, das billige Geld, nicht beseitigt ist. Nico. B. Rottke und Christopher Yvo Oertel, EBS UniversitĂ€t fĂŒr Wirtschaft und Recht, Wiesbaden, können aktuell auf dem gesamtdeutschen Wohnimmobilienmarkt keine Ăberhitzungstendenzen ausmachen. Lediglich in kleinen, regionalen TeilmĂ€rkten seien Preisentwicklungen zu beobachten, die unter die Definition einer Preisblase fallen. Das VerhĂ€ltnis von Kaufpreisen zu Einkommen sei trotz einer Steigerung seit dem Jahr 2010 immer noch auf einem historisch niedrigen Niveau. Angesichts historischer Erfahrungen erscheint es Andreas Mense, UniversitĂ€t Erlangen-NĂŒrnberg, wahrscheinlich, dass sich die jĂŒngsten Preisanstiege in manchen deutschen GroĂstĂ€dten nicht auf unbestimmte Zeit fortsetzen werden. Es bestehe aber die Gefahr, dass die bisherige Entwicklung unreflektiert in die Zukunft fortgeschrieben werde, obwohl die dafĂŒr ursĂ€chlichen Elemente vornehmlich kurzfristiger Natur seien. Jens Schumacher, Bundesministerium fĂŒr Verkehr, Bau und Stadtentwicklung, ist der Meinung, dass es gegenwĂ€rtig keine Immobilienblase in Deutschland gibt. DafĂŒr sprechen u.a. die Entwicklung der Immobilienpreise in den letzten 30 Jahren, die Entwicklung der Preis-Miet-Relationen, die Einkommens- und BeschĂ€ftigungsentwicklung und die Erschw
Microcyclospora and Microcyclosporella: novel genera accommodating epiphytic fungi causing sooty blotch on apple
Recent studies have found a wide range of ascomycetes to be associated with sooty blotch and flyspeck (SBFS) blemishes on the surfaces of pomaceous fruits, specifically apples. Based on collections of such fungi from apple orchards in Germany and Slovenia we introduce two novel genera according to analyses of morphological characters and nuclear ribosomal DNA sequences (large subunit and internal transcribed spacer regions). Microcyclosporella is represented by a single species, M. mali, and is presently known from Germany and Slovenia. Microcyclosporella is Pseudocercosporella-like in morphology, but genetically and morphologically distinct from Pseudocercosporella s.str., for which an epitype is designated based on a fresh collection of P. bakeri from Laos. Furthermore, Pseudocercosporella is shown to be paraphyletic within the Capnodiales. Microcyclospora gen. nov. is Pseudocercospora-like in morphology, but is genetically and morphologically distinct from Pseudocercospora s.str., which is based on P. vitis. Three species, Microcyclospora malicola, M. pomicola (both collected in Germany), and M. tardicrescens (collected in Slovenia) are described. Finally, a new species of Devriesia, D. pseudoamericana, is described from pome fruit surfaces collected in Germany. Devriesia is shown to be paraphyletic, and to represent several lineages of which only Devriesia s.str. is thermotolerant. Further collections are required, however, before the latter generic complex can be resolved
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Limited English Proficient Patients and Time Spent in Therapeutic Range in a Warfarin Anticoagulation Clinic
Background: While anticoagulation clinics have been shown to deliver tailored, highâquality care to patients receiving warfarin therapy, communication barriers with limited English proficient (LEP) patients may lead to disparities in anticoagulation outcomes. Methods and Results: We analyzed data on 3770 patients receiving care from the Massachusetts General Hospital Anticoagulation Management Service (AMS) from 2009 to 2010. This included data on international normalized ratio (INR) tests and patient characteristics, including language and whether AMS used a surrogate for primary communication. We calculated percent time in therapeutic range (TTR for INR between 2.0 and 3.0) and time in danger range (TDR for INR 3.5) using the standard Rosendaal interpolation method. There were 241 LEP patients; LEP patients, compared with nonâLEP patients, had a higher number of comorbidities (3.2 versus 2.9 comorbidities, P=0.004), were more frequently uninsured (17.0% versus 4.3%, P<0.001), and less educated (47.7% versus 6.0% â€high school education, P<0.001). LEP patients compared with nonâLEP patients spent less TTR (71.6% versus 74.0%, P=0.007) and more TDR (12.9% versus 11.3%, P=0.018). In adjusted analyses, LEP patients had lower TTR as compared with nonâLEP patients (OR 1.5, 95% CI [1.1, 2.2]). LEP patients who used a communication surrogate spent less TTR and more TDR. Conclusion: Even within a large anticoagulation clinic with a high average TTR, a small but significant decrease in TTR was observed for LEP patients compared with English speakers. Future studies are warranted to explore how the use of professional interpreters impact TTR for LEP patients
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Association between Psychotic Symptoms and Cortical Thickness Reduction across the Schizophrenia Spectrum
The current study provides a complete MRI analysis of thickness throughout the cerebral cortical mantle in patients with schizophrenia (SZ) and rigorously screened and matched unaffected relatives and controls and an assessment of its relation to psychopathology and subjective cognitive function. We analyzed 3D-anatomical magnetic resonance imaging data sets, obtained at 3 Tesla, from three different subject groups: 25 SZ patients, 29 first-degree relatives and 37 healthy control subjects. We computed whole-brain cortical thickness using the Freesurfer software and assessed group differences. We also acquired clinical and psychometric data. The results showed markedly reduced cortical thickness in SZ patients compared with controls, most notably in the frontal and temporal lobes, in the superior parietal lobe and several limbic areas, with intermediate levels of cortical thickness in relatives. In both patients and relatives, we found an association between subjective cognitive dysfunction and reduced thickness of frontal cortex, and predisposition towards hallucinations and reduced thickness of the superior temporal gyrus. Our findings suggest that changes in specific cortical areas may predispose to specific symptoms, as exemplified by the association between temporal cortex thinning and hallucinations
Portable Vis-NIR und MIR Spektroskopie zur Erfassung von Bodeneigenschaften im Labor und im GelĂ€nde: Ergebnisse einer Fallstudie an LöĂböden der Querfurter Platte (Sachsen-Anhalt)
Laborbasierte spektroskopische Verfahren im nahen Infrarot (inklusive dem sichtbaren Bereich; Vis-NIR, 400 â 2500 nm) und im mittleren Infrarot (MIR, 2500 â 25000 nm) stellen erprobte Methoden zur quantitativen Erfassung verschiedenster Bodeneigenschaften in ErgĂ€nzung zur klassischen Laboranalytik dar. Im MIR-Bereich hat sich als Technik die DRIFT (âDiffuse Reflectance Infrared Fourier Transformâ)-Spektroskopie etabliert, die, vergleichbar mit der Vis-NIR Spektroskopie, wenig Aufwand bei der Probenaufbereitung erfordert. Im Gegensatz zum Vis-NIR Bereich fehlen im MIR-Bereich Fallstudien mit âin-situâ Messungen, da portable FTIR-Spektrometer erst seit wenigen Jahren verfĂŒgbar sind. Die vorliegende Untersuchung trĂ€gt hier zum LĂŒckenschluss bei. FĂŒr 100 Ackerstandorte der Querfurter Platte (Tschernoseme der Mitteldeutschen Trockengebiete) wurden mit portablen Vis-NIR und MIR-GerĂ€ten (ASD FieldSpec-4 Wide-Res Feldpektroradiometer mit âContact Probeâ; aktives Agilent 4300 Handheld FTIR-Spektrometer mit âDiffuse Reflectance Sample Interfaceâ) in-situ Messungen durchgefĂŒhrt. ZusĂ€tzlich erfolgten eine Probennahme und erneute spektrale Vermessung der aufbereiteten Proben (gemahlen und luftgetrocknet) im Labor; nasschemisch wurden Referenzwerte fĂŒr den gesamten und den organischen Kohlenstoff, Gesamt-Stickstoffgehalte und ph-Werte ermittelt. Auf dieser Datenbasis werden folgende Fragestellungen behandelt: 1) Vergleich beider Techniken hinsichtlich ihrer Potenziale zur Quantifizierung der genannten BodengröĂen (sowohl im Labor als auch im GelĂ€nde) mit verschiedenen multivariaten KalibrationsansĂ€tzen (insbesondere Partial Least Squares Regression mit und ohne Spektralvariablenselektion); 2) Bewertung von Limitationen beider Techniken bei der praktischen DurchfĂŒhrung von GelĂ€ndemessungen; 3) Möglichkeiten zur synergistischen Nutzung beider Spektralbereiche fĂŒr eine verbesserte AbschĂ€tzung der Bodeneigenschaften
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