We present a statistical analysis of the largest X-ray survey of nearby spiral galaxies in which diffuse emission has been separated from discrete source contributions. Regression and rank-order correlation analyses are used to compare X-ray properties such as total, source and diffuse luminosities, and diffuse emission temperature, with a variety of physical and multi-wavelength properties, su...

We report the results of the spatial and spectral analysis of the ROSAT HRI and PSPC observations of the edge-on spiral galaxy NGC 3079. We detected several sources in the field of NGC 3079 with both PSPC and HRI, and complex emission from the inner 5 ′ around NGC 3079. We have identified possible counterparts for several of the sources outside NGC 3079 by comparison with optical plates and cat...

Human lactoferrin is an iron-binding glycoprotein that is particularly prominent in exocrine secretions and leukocytes and is also found in serum, especially during inflammation. It is able to sequester iron from microbes and has immunomodulatory functions, including inhibition of both complement activation and cytokine production. This study used mutants lacking pneumococcal surface protein A ...

BACKGROUND Pneumococcal serotypes are represented by a varying number of clonal lineages with different genetic contents, potentially affecting invasiveness. However, genetic variation within the same genetic lineage may be larger than anticipated. METHODS A total of 715 invasive and carriage isolates from children in the same region and during the same period were compared using pulsed-field...

We report the results of the spatial and spectral analysis of the ROSAT HRI and PSPC observations of the edge-on spiral galaxy NGC 3079. We detected several sources in the field of NGC 3079 with both PSPC and HRI, and complex emission from the inner 5′ around NGC 3079. We have identified possible counterparts for several of the sources outside NGC 3079 by comparison with optical plates and cata...

The phage shock protein operon (pspABCE) of Escherichia coli is strongly induced by adverse environmental conditions. Expression is controlled principally at the transcriptional level, and transcription is directed by the sigma factor sigma 54. PspB and PspC are required for high-level psp expression during osmotic shock, ethanol treatment and f1 infection, but heat-induced expression is indepe...

We present a 10-year X-ray light curve and the spectra of a peculiar X-ray transient in the spiral galaxy M81. The source was below the detection limit of ROSAT PSPC before 1993, but it brightened substantially in 1993, with luminosities exceeding the Eddington limit of a 1.5-M⊙ compact accretor. It then faded and was not firmly detected in the ROSAT HRI and PSPC observations after 1994. The Ch...

We report spectral fitting results for Rosat PSPC observations of the dipping source X 1755-338. These results are consistent with the two-component model that we previously proposed consisting of a blackbody point source plus an extended power law component. Remarkably, the low energy cutoff of the spectrum does not change appreciably in dips, and it can be seen that dipping takes place in the...

We developed and tested a Non-Equilibrium of Ionization (NEI) emission model to study the X-ray emission of supernova remnants (SNR's) with a paramet-ric tting approach. We present results of ROSAT PSPC spectral tting simulations with our emission model. We found that, the conndence ranges of the plasma temperature tend to be larger with respect to ts with equilibrium of ionization models, the ...