oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Re-description of Trypanosoma corvi Stephens and Christophers,1908 Emend. Baker, 1976 and remarks on the Trypanosomes of the Avian Family Corvidae
Nandi, N. C.;Bennett, Gordon F.;
Memórias do Instituto Oswaldo Cruz , 1994, DOI: 10.1590/S0074-02761994000200005
Abstract: the trypomastigote, epimastigote and amastigote stages of trypanosoma corvi stephens and christophers, 1908 emend. baker, 1976 from the peripheral blood, heart and bone marrow are described herein. other trypanosomes described from the corvidae are compared to t. corvi and their status is discussed.
Models of the Eta Corvi debris disk from the Keck Interferometer, Spitzer and Herschel  [PDF]
J. Lebreton,C. Beichman,G. Bryden,D. Defrère,B. Mennesson,R. Millan-Gabet,A. Boccaletti
Physics , 2015,
Abstract: Debris disks are signposts of analogues to small body populations of the Solar System, often however with much higher masses and dust production rates. The disk associated with the nearby star Eta Corvi is especially striking as it shows strong mid- and far-infrared excesses despite an age of ~1.4 Gyr. We undertake to construct a consistent model of the system able to explain a diverse collection of spatial and spectral data. We analyze Keck Interferometer Nuller measurements and revisit Spitzer and additional spectro-photometric data, as well as resolved Herschel images to determine the dust spatial distribution in the inner exozodi and in the outer belt. We model in detail the two-component disk and the dust properties from the sub-AU scale to the outermost regions by fitting simultaneously all measurements against a large parameter space. The properties of the cold belt are consistent with a collisional cascade in a reservoir of ice-free planetesimals at 133 AU. It shows marginal evidence for asymmetries along the major axis. KIN enables us to establish that the warm dust consists in a ring that peaks between 0.2 and 0.8 AU. To reconcile this location with the ~400 K dust temperature, very high albedo dust must be invoked and a distribution of forsterite grains starting from micron sizes satisfies this criterion while providing an excellent fit to the spectrum. We discuss additional constraints from the LBTI and near-infrared spectra, and we present predictions of what JWST can unveil about this unusual object and whether it can detect unseen planets.
Resolving the hot dust around HD69830 and eta Corvi with MIDI and VISIR  [PDF]
R. Smith,M. C. Wyatt,C. A. Haniff
Physics , 2009, DOI: 10.1051/0004-6361/200911626
Abstract: Most of the known debris discs exhibit cool dust in regions analogous to the Edgeworth-Kuiper Belt. However, a rare subset show hot excess from within a few AU, which is often inferred to be transient. We examine 2 such sources to place limits on their location to help distinguish between different interpretations for their origin. We use MIDI on the VLTI to observe the debris discs around eta Corvi and HD69830 using baseline lengths from 44-130m. New VISIR observations of HD69830 at 18.7um are also presented. These observations are compared with disc models to place limits on disc size. The visibility functions measured with MIDI for both sources show significant variation with wavelength across 8-13um in a manner consistent with the disc flux being well resolved, notably with a dip at 10-11.5um due to the silicate emission feature. The average ratio of visibilities measured between 10-11.5um and 8-9um is 0.934+/-0.015 for HD69830 and 0.880+/-0.013 for eta Corvi over the 4 baselines for each source, a departure of 4 and 9sigma from that expected if the discs were unresolved. HD69830 is unresolved by VISIR at 18.7um. The combined limits from MIDI and 8m imaging constrain the warm dust to lie within 0.05-2.4AU for HD69830 and 0.16-2.98AU for eta Corvi. These results represent the first resolution in the mid-IR of dust around main sequence stars. The constraints placed on the location of the dust are consistent with radii predicted by SED modelling. Tentative evidence for a common position angle for the dust at 1.7AU with that at 150AU around eta Corvi, which might be expected if the hot dust is fed from the outer disc, demonstrates the potential of this technique for constraining the origin of the dust and more generally for the study of dust in the terrestrial regions of main sequence stars.
Alessandro Litta Modignani, Da Buenos Aires a Valparaiso (Introduzione, trascrizione e note di Patrizia Spinato Bruschi)
Clara Camplani
Altre Modernità , 2009,
Abstract: Alessandro Litta Modignani, Da Buenos Aires a Valparaiso (Introduzione, trascrizione e note di Patrizia Spinato Bruschi)
Aspectos de la religiosidad porte?a. ValparaIso 1830-1930
MILLAR CARVACHO,RENé;
Historia (Santiago) , 2000, DOI: 10.4067/S0717-71942000003300007
Abstract: valparaiso was the fastest growing town in chile during the 19th century, to the extent that the original inhabitants became a minority in relation to the newcomers. the most important of these groups of immigrants were the foreign communities, on account of their economic and social influence. they left their mark not only in the daily life of the port but also in their wy of thinking and religious attitudes. valparaiso, in contrast to the rest of chile, had an important group of noncatholics. the development and public manifestations of these dissidents, was due both to the growth in their numbers and to the weakness of the catholic presence in that por during the first half of the 19th century. however, from the 1860s on, the situation tended to change due to difficulties faced by the protestants and freemasons, and the recovery of the catholic church under the apostolic governor mariano casanova. at the end of the century, catholic worship who had remained aloof from the native population, began to make strong inroads in the midst thanks to the work of the pentecostalists
Aspectos de la religiosidad porte a. ValparaIso 1830-1930  [cached]
RENé MILLAR CARVACHO
Historia (Santiago) , 2000,
Abstract: Valparaiso was the fastest growing town in Chile during the 19th century, to the extent that the original inhabitants became a minority in relation to the newcomers. The most important of these groups of immigrants were the foreign communities, on account of their economic and social influence. They left their mark not only in the daily life of the port but also in their wy of thinking and religious attitudes. Valparaiso, in contrast to the rest of Chile, had an important group of noncatholics. The development and public manifestations of these dissidents, was due both to the growth in their numbers and to the weakness of the Catholic presence in that por during the first half of the 19th century. However, from the 1860s on, the situation tended to change due to difficulties faced by the protestants and freemasons, and the recovery of the Catholic Church under the apostolic governor Mariano Casanova. At the end of the century, Catholic worship who had remained aloof from the native population, began to make strong inroads in the midst thanks to the work of the Pentecostalists
Bignor Roman Villa and the Institute of Archaeology  [cached]
David Rudling
Archaeology International , 1997, DOI: 10.5334/ai.0106
Abstract: The large Roman villa at Bignor is one of the most elaborate in Britain. The Director of the Institute's Field Archaeology Unit describes the history and current stage of its archaeological investigation.
Una villa en Villa de Leyva, obra del arquitecto Guillermo Fischer Villa de Leyva, Colombia  [PDF]
Juan Pablo Aschner Rosselli
DEARQ : Journal of Architecture , 2010,
Abstract: Desde las impresiones que despierta una casa de recreo dise ada por Guillermo Fischer en Villa de Leyva se pretende una aproximación al significado y a la historia de la villa, entendida como tipología edilicia que responde a un determinado modo de habitar en el campo. En este escrito, se esbozan hipótesis con respecto a la relación estética y moral de la casa con preexistencias edilicias y con tradiciones sociales arraigadas y se describen los acercamientos y distanciamientos de la villa en relación con su contexto espacial y temporal. En la villa de Villa de Leyva atendemos a un despertar de la tipología, gracias a la atenta lectura de la historia y a la sensibilidad proyectual de su arquitecto Guillermo Fischer.
Spitzer Evidence for a Late Heavy Bombardment and the Formation of Urelites in η Corvi at ~1 Gyr  [PDF]
C. M. Lisse,M. C. Wyatt,C. H. Chen,A. Morlok,D. M. Watson,P. Manoj,P. Sheehan,T. M. Currie,P. Thebault,M. L. Sitko
Physics , 2011, DOI: 10.1088/0004-637X/747/2/93
Abstract: We have analyzed Spitzer and NASA/IRTF 2 - 35 \mum spectra of the warm, ~350 K circumstellar dust around the nearby MS star {\eta} Corvi (F2V, 1.4 \pm 0.3 Gyr). The spectra show clear evidence for warm, water- and carbon-rich dust at ~3 AU from the central star, in the system's Terrestrial Habitability Zone. Spectral features due to ultra-primitive cometary material were found, in addition to features due to impact produced silica and high temperature carbonaceous phases. At least 9 x 10^18 kg of 0.1 - 100 \mum warm dust is present in a collisional equilibrium distribution with dn/da ~ a^-3.5, the equivalent of a 130 km radius KBO of 1.0 g/cm^3 density and similar to recent estimates of the mass delivered to the Earth at 0.6 - 0.8 Gyr during the Late Heavy Bombardment. We conclude that the parent body was a Kuiper-Belt body or bodies which captured a large amount of early primitive material in the first Myrs of the system's lifetime and preserved it in deep freeze at ~150 AU. At ~1.4 Gyr they were prompted by dynamical stirring of their parent Kuiper Belt into spiraling into the inner system, eventually colliding at 5-10 km/sec with a rocky planetary body of mass \leq MEarth at ~3 AU, delivering large amounts of water (>0.1% of MEarth's Oceans) and carbon-rich material. The Spitzer spectrum also closely matches spectra reported for the Ureilite meteorites of the Sudan Almahata Sitta fall in 2008, suggesting that one of the Ureilite parent bodies was a KBO.
Carceri, Italia tutto esaurito  [cached]
Marco Mozzoni
Brainfactor , 2012,
Abstract: In Italia "tutto esaurito". Purtroppo non stiamo parlando di turismo ma di carceri, sovraffollate al 142,5%, con 66.685 detenuti a fronte di 46.795 posti disponibili. La media europea è del 99,6 per cento. Le regioni più affollate: Liguria (176,8%), Puglia (176,5%), Veneto (164,1%). Le meno affollate: Abruzzo (121,8%), Sardegna (105,5%), Basilicata (103%). Lo rivela il "IX Rapporto sulle condizioni di dentenzione" di Antigone...
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.