We present the ROSAT PSPC pointed and ROSAT All-Sky Survey (RASS) observations and the results of our low and high spectral resolution optical follow-up observations of the T Tauri stars (TTS) and X-ray selected T Tauri star candidates in the region of the high galactic latitude dark cloud MBM12 (L1453-L1454, L1457, L1458). Previous observations have revealed 3 “classical” T Tauri stars and 1 “...

We present a method for determining source counts, S/N, and upper limits at speciied positions in a crowded ROSAT PSPC eld using a combination of publicly available software packages. The algorithm is based on the so-called`Local DETECT' method of source detection, and improves upon currently available software, to permit a meaningful comparison of non-detections with detected sources. We also ...

Alkaline treatment method was used to ext ract collagen. Sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) and circular dichroism (CD) spectra revealed that the alkali-soluble pigskin collagen (ASPC) retained the polypeptide chains and triple helix conformat ion. The amino acid profiles showed no major deviation from the characteristic collagen composition. Both of the denat...

BACKGROUND Acute exacerbations of chronic obstructive pulmonary disease (AECOPD) are often linked to respiratory infections. However, it is unknown if COPD patients who experience frequent exacerbations have impaired humoral immunity. The aim of this study was to determine if antibodies specific for common respiratory pathogens are associated with AECOPD. METHODS Plasma was obtained from COPD...

We present in this paper analyses of the ROSAT PSPC and ASCA SIS and GIS observations of the Crab-like supernova remnant (SNR) G54.1+0.3. Its spectrum obtained by ROSAT PSPC favors a power law model with a photon index of -0.8 −2.0, absorbed energy flux in 0.1-2.4 keV of 1.0×10 erg cm s, and absorption column density of 12.3 −3.2 × 10 21 cm. ASCA SIS observation shows that its spectrum can also...

Streptococcus pneumoniae are commensals of the human nasopharynx with the capacity to invade mucosal respiratory cells. PspC, a pneumococcal surface protein, interacts with the human polymeric immunoglobulin receptor (pIgR) to promote bacterial adherence to and invasion into epithelial cells. Internalization of pneumococci requires the coordinated action of actin cytoskeleton rearrangements and...

We present the results of a ROSAT study of NGC 2422, a southern open cluster at a distance of about 470 pc, with an age close to the Pleiades. Source detection was performed on two observations, a 10-ksec PSPC and a 40-ksec HRI pointing, with a detection algorithm based on wavelet transforms, particularly suited to detecting faint sources in crowded elds. We have detected 78 sources, 13 of whic...

We present an X-ray spectral and spatial analysis of the composite starburst/Seyfert galaxy NGC1365. Excellent fits of the ROSAT PSPC spectrum are obtained by combining a soft thermal component with a hard powerlaw. The hard component may be either seen directly or can be explained by scattering of the AGN powerlaw at circumnuclear warm high-column-density gas. A compilation of the multi-wavele...