The European hornbeam (Carpinus betulus L.) is a transitional species in the Polish flora, reaching its northeastern range limit just beyond the Polish border (Jalas and Suominen, 1976; Boratyńska, 1993). The species is a telocratic taxon which appeared in Central Europe ~5000 years ago and spread throughout Poland ~4000 years ago (Huntley and Birks, 1983; Środoń, 1993; Ralska-Jasiewiczowa et a...

Today a large part of the European population is exposed to levels air pollution exceeding standards recommended by World Health Organization. Moreover, and seasonal emission allergenic pollen are progressively affecting human health can cause severe allergic reactions, particularly when combines with allergen peaks. Unlike atmospheric pollutants anthropogenic origin, sources have pulsating tre...

Wood anatomy of the single spec ies of Cana comyrica (hitherto not studied) shows that it belongs in Myricaceae, although it differs from other genera in several respects (axial parenchyma grouped in bands or columns as well as diffuse ; Heterogeneou s Type I rays; more numerous bars per perforat ion plate). The latter two features are primitive for the family . The four genera (Canacomyrica. C...

BACKGROUND Air pollution can cause respiratory symptoms or exacerbate pre-existing respiratory diseases, especially in children. This study looked at the short-term association of air pollution concentrations with Emergency Room (ER) admissions for respiratory reasons in pediatric age (0-18 years). METHODS Daily number of ER admissions in a children's Hospital, concentrations of urban-backgro...