High-resolution X-ray observations of the face-on galaxy M 83 with the HRI onboard ROSAT are presented. The analysis aimed at studying the X-ray point source population inside the galaxy and disentangling the X-ray emission components (i.e. point sources, extended emission from hot gas in the bulge, disk and halo). Within the D25 ellipse of M 83, 21 X-ray sources are detected with (0.1–2.4 keV ...

Brane configurations that contain a tachyonic mode are unstable and will decay. The decay modes vary depending on the unstable D-brane configurations involved ~see the reviews @1–3#!. In bosonic string theory, all D-branes are unstable. The tachyon on the brane may condense to solitonic solutions of the open string tachyon field theory. These solitons have been noted to correspond to lower dime...

The focus of this work is the dosimetric impact of multileaf collimator (MLC) leaf width on the treatment of prostate cancer with intensity-modulated radiation therapy (IMRT). Ten patients with prostate cancer were planned for IMRT delivery using two different MLC leaf widths--4mm and 10mm--representing the Radionics micro-multileaf collimator (mMLC) and Siemens MLC, respectively. Treatment pla...

Near-infrared spectroscopy of eight high-redshift powerful radio galaxies (jrest D 3700È6800 AŽ ) (HzPRGs) at z\ 2.2È2.6 is presented. Strong forbidden lines and Ha emission were detected in all sources ; the data show evidence that the emission lines of the HzPRGs may contribute a substantial fraction (D25%È98%) of their total observed Hand/or K-band light. Diagnostic emission-line ratiosÈ [O ...

BACKGROUND Mycoplasma hyopneumoniae (M. hyopneumoniae) is the primary agent of enzootic pneumonia in pigs. Pigs are often infected with different M. hyopneumoniae strains. This study assessed the efficacy of vaccination against experimental infection with two genetically different M. hyopneumoniae strains in weaned piglets. At 33 days of age (D0), 45 M. hyopneumoniae-free piglets were randomly ...

NGC 4449 is an active star-forming dwarf galaxy of Magellanic type. From radio observations, van Woerden et al. (1975) found an extended HI-halo around NGC 4449 which is at least a factor of 10 larger than the optical diameter D25 ≈ 5.6 kpc. Recently, Hunter et al. (1998) discerned details in the HI-halo: a disc-like feature around the center of NGC 4449 and a lopsided arm structure. We combine...

BACKGROUND Microwave irradiation has been tried as a replacement for the conventional tissue processing technique in histopathology laboratories for quite some time. Studies have shown that Domestic Microwave Tissue Processing (DMWTP) provides a faster delivery of the tissue sections with a morphology which is similar to that which is seen Conventional Tissue Processing (CTP). But many laborato...

Several N-body methods were combined in order to develop a method for the determination of the parameters of interacting galaxies. This method has been applied to the HI distribution of NGC4449. In a first step the fast restricted N-body models were used to confine a region in parameter space reproducing the main observational features. In a second step a genetic algorithm is introduced which a...

BACKGROUND Hypofractionated Radiotherapy (RT) regimens for breast cancer, although reduce cost and time for patients and health care systems, could have a negative impact on normal underlying lung tissue. We studied and compared lung function and the post-RT radiological changes using High-Resolution Computed Tomography (HRCT) in early breast cancer patients, treated with 3-Dimentional conforma...