Réservoir animal, caractéristiques et différenciation de trios Cryptococcus voisins: C. neoformans, C. uniguttulatus et C. luteolus

Saëz, H.

doi:10.1111/j.1439-0450.1978.tb01071.x

Cited by 6 publications

(3 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More recently,Saez et al (2008) find the same correlation to be significant to > 99.5% for 173 bright, radio-quiet quasars in the Chandra Deep Fields. However, the trends found inSaez et al (2008) are dominated by Type 2 quasars, particularly at low X-ray luminosities. As we have excluded Type 2 quasars, the two samples are not in conflict.…”

mentioning

confidence: 64%

THE FIFTH DATA RELEASE SLOAN DIGITAL SKY SURVEY/ XMM-NEWTON QUASAR SURVEY

Young¹,

Elvis²,

Risaliti³

2009

ApJS

View full text Add to dashboard Cite

We present a catalog of 792 DR5 SDSS quasars with optical spectra that have been observed serendipitously in the X-rays with the XMM-Newton. These quasars cover a redshift range of z = 0.11 -5.41 and a magnitude range of i = 15.3-20.7. Substantial numbers of radio-loud (70) and broad absorption line (51) quasars exist within this sample. Significant X-ray detections at ≥ 2σ account for 87% of the sample (685 quasars), and 473 quasars are detected at ≥ 6σ, sufficient to allow X-ray spectral fits. For detected sources, ∼ 60% have X-ray fluxes between F 2−10keV = 1 -10 x 10 −14 ergs cm −2 s −1 . We fit a single power-law, a fixed power-law with intrinsic absorption left free to vary, and an absorbed power-law model to all quasars with X-ray S/N ≥ 6, resulting in a weighted mean photon index Γ = 1.91±0.08, with an intrinsic dispersion σ Γ = 0.38. For the 55 sources (11.6%) that prefer intrinsic absorption, we find a weighted mean N H = 1.5±0.3 x 10 21 cm −2 . We find that Γ correlates significantly with optical color, ∆(g − i), the optical-to-X-ray spectral index (α ox ) and the Xray luminosity. While the first two correlations can be explained as artefacts of undetected intrinsic absorption, the correlation between Γ and X-ray luminosity appears to be a real physical correlation, indicating a pivot in the X-ray slope.

show abstract

mentioning

confidence: 64%

THE FIFTH DATA RELEASE SLOAN DIGITAL SKY SURVEY/ XMM-NEWTON QUASAR SURVEY

Young¹,

Elvis²,

Risaliti³

2009

ApJS

View full text Add to dashboard Cite

show abstract

“…A significantly flatter Γ may be explained via relation to other quantities. The X-ray spectral slope of normal quasars does not depend on optical luminosity or redshift (Shemmer et al 2005;Vignali et al 2005), but does depend slightly on X-ray luminosity (Dai et al 2004;Saez et al 2008). However, the Γ-L x correlation contains too much intrinsic scatter (e.g.…”

Section: X-ray Power-law Indexmentioning

confidence: 99%

“…However, the Γ-L x correlation contains too much intrinsic scatter (e.g. Figure 8 of Saez et al 2008) to make conclusive statements about the intrinsically red quasars. The Γ-L x corrrelation is not significant in the red quasar sample.…”

Section: X-ray Power-law Indexmentioning

confidence: 99%

The Reddest DR3 SDSS/XMM‐NewtonQuasars

Young

Elvis

Risaliti

2008

Astrophysical Journal

View full text Add to dashboard Cite

We have cross-correlated the SDSS DR3 Schneider et al. (2005) quasar catalog with the XMM-Newton archive. Color and redshift selections (g − r ≥ 0.5 and 0.9 < z < 2.1) result in a sample of 17 red, moderate redshift quasars. The redshift selection minimizes possible contamination due to host galaxy emission and Lyα forest absorption. Both optical and X-ray information are required to distinguish between the two likely remaining causes of the red colors: 1) dust-reddening and 2) an intrinsically red continuum. We find that 7 of 17 quasars can be classified as probable 'intrinsically red' objects. These 7 quasars have unusually broad MgII emission lines (=10,500 km s −1 ), moderately flat, but unabsorbed X-ray spectra (< Γ >=1.66±0.08), and low accretion rates (Ṁ /Ṁ Edd ∼ 0.01). We suggest low accretion rates as a a possible physical explanation for quasars with intrinsically red optical continua. We find that 8 of 17 quasars can be classified as dust-reddened. Three of these have upper-limits on the absorption column from X-ray spectral fits of N H = 3-13 x 10 22 cm 2 , while the other five quasars must be absorbed by at least N H = 10 23 cm 2 in order to be consistent with a comparably selected α ox − l uv distribution. Two objects in the sample are unclassified.

show abstract

Evolution journaliere puis hebdomadaire de la flore digestive a levures d'un Grand Panda femelle

Saëz

1979

Mycopathologia

View full text Add to dashboard Cite

Since its arrival at the Paris's zoological Park, the yeasts of the flora digestive tract of a young female of Giant Panda, Ailuropoda melanoleuca, was daily, then weekly studied. Were noted: the diet in captivity, the number of isolates in primary-cultures, the morpho-physiological differences between strains of a same species and the maximal temperature for growth of all the fungi. Were also approached, for the analysis, some data on the yeast-flora of other captive mammals and on the yeast species of the habitat. Short time colonization recorded seems the result of a difficulty of adaptation, even for C. albicans, to the digestive tract of that animal. The majority of the yeasts identified are transient microorganisms of alimentary, aquatic or aerial origin.

show abstract

Réservoir animal, caractéristiques et différenciation de trios Cryptococcus voisins: C. neoformans, C. uniguttulatus et C. luteolus

Cited by 6 publications

References 13 publications

THE FIFTH DATA RELEASE SLOAN DIGITAL SKY SURVEY/ XMM-NEWTON QUASAR SURVEY

THE FIFTH DATA RELEASE SLOAN DIGITAL SKY SURVEY/ XMM-NEWTON QUASAR SURVEY

The Reddest DR3 SDSS/XMM‐NewtonQuasars

Evolution journaliere puis hebdomadaire de la flore digestive a levures d'un Grand Panda femelle

Contact Info

Product

Resources

About