MATERIAL Thirty eight fecal samples of Eurasian Lynx (Lynx lynx L.) collected in Białowieza Primeval Forest (E Poland) in years 2001-2004 were analysed. RESULTS The presence of Aelurostrongylus abstrusus (L1) larvae was evidenced by use of decantation and flotation methods. The general prevalence of the infection recorded during the study was 21.1%, whereas mean intensity was 11,5 (1-33 larva...

Jeans instability is derived for the case of a low density self-gravitating fully ionized gas in the presence of a constant magnetic field. A new Jeans wave number, substantially enhanced by the magnetic field, is established under a suitable symmetry assumption. Nevertheless, from our present knowledge regarding the existence of primeval magnetic fields in the Universe, it appears that they ar...

We present the first results of a study of the expected properties of the first stellar generations in the Universe. In particular, we consider and discuss a series of properties that, on the basis of the emission from associated HII regions, permit one to discern bona fide primeval stellar generations from the ones formed after pollution from supernova explosions. The expected performance of N...

Despite their apparent fragile appearance, dwarf spheroidals are the most common galaxy type in clusters. In this paper we consider some of the issues associated with two major models for the origin of these dwarfs: primeval galaxies which formed with the cluster and the modification of accreted systems. We argue that the present observational evidence, derived from the Virgo and Perseus cluste...