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Paradoxical Immune Reconstitution Inflammatory Syndrome Presenting as Extrapulmonary Tuberculosis in a Patient With HIV. [PDF]

Cureus
Shang W, Bruno TF.
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Dissemination of OXA-23 carbapenemase-producingProteus mirabilisandEscherichia coliis driven by transposon-carrying lineages in the UK

Zamudio R, Osman K, Pike R, Chaudhry A, Meunier D, Stoesser N, Stretch R, Turton JF, Williams D, Hopkins KL.   +9 more
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The Cepheid distance scale

Publications of the Astronomical Society of the Pacific, 1991
Developments concerning the period-luminosity (PL) relation for classical Cepheids are discussed with particular emphasis on the fact that Cepheids continue to provide the most homogeneous and reliable set of distances to many nearby galaxies. Observational programs relating to extragalactic Cepheids are also reviewed, and new distances and reddenings ...
Wendy Freedman
exaly   +2 more sources

Tuning the Cepheid distance scale

Publications of the Astronomical Society of the Pacific, 1992
Ongoing observational programs (both from the ground and space) will provide a significantly larger sample of galaxies with well-studied Cepheids both within the Local Group and in more distant galaxies. Recent efforts in the calibration of the Cepheid distance scale utilizing Cepheids in star clusters in the Galaxy and in the Magellanic Clouds are ...
exaly   +2 more sources

Cepheids As Distance Indicators

Annual Review of Astronomy and Astrophysics, 1987
This review attempts to summarize the various ways of determining Cepheid reddenings and luminosities and the zero points of the Cepheid period-luminosity and period-luminosity-color relations. The methods of determining luminosities that are discussed involve Cepheid parallaxes, Cepheid proper motions and radial velocities, Cepheids in clusters and ...
M. W. Feast, A. R. Walker
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Cepheids and the Distance Ladder [PDF]

, 2016
Classical Cepheids plays a key role in the calibration of the extragalactic distance scale. In spite of their importance, some uncertainties related to their properties remain. In particular, a general consensus on the possible dependence on the metallicity of the host galaxy of the Cepheid properties has not been reached yet. These uncertainties could
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Cepheid distance to the virgo cluster

Pramana, 1999
HST data on Cepheid variables in one Virgo Cluster spiral galaxy is re-analyzed, taking into account flux-limited incompleteness in the sample and calibration of the period-luminosity relation in the relevant period range. Distance to the Virgo Cluster is estimated to be 19.6 ± 1.7 (random) ± 2.6 (systematic) Mpc.
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Distances and Radii of Classical Cepheids

Highlights of Astronomy, 1980
Suppose one of the current high angular resolution instruments were capable of measuring the instantaneous angular diameter of a Cepheid throughout its pulsation cycle. By comparing the angular diameter variation to the linear displacement variation, obtained from the integrated radial velocity curve, one could determine both the linear radius and the ...
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Distance Determination with Cepheid Variables

1999
Cepheid variables have long formed the backbone of the extra-galactic distance scale. The HST has greatly increased the range of Cepheid studies, making many more galaxies available for calibrating secondary distance indicators. This makes the calibration of the Cepheid period-luminosity relations, and investigations of systematic uncertainties, of ...
openaire   +1 more source