[Presence of spirochetes of Borrelia burgdorferi sensu lato in Ixodes ricinus ticks in the recreational area of Tarnowskie Gory and Zabrze districts in 2001-2003].

Borrelia burgdorferi sensu lato is an aethiological factor of borreliosis. Borrelia spirochete is transmitted to humans by ticks. The aim of the study was to estimate the spirochetes B.

Permanent effects of postnatal administration of beta-adrenergic ligands on the volume of sexually dimorphic nucleus of the preoptic area (SDN-POA) in rats.

Background: beta-adrenergic ligands have been shown to influence sexual differentiation of the brain. In the present study we document that short postnatal treatment with beta-adrenergic agonists or antagonists may permanently reverse the morphological sex of the brain, as judged by the volume of sexually dimorphic nucleus of the preoptic area (SDN-POA). Female rats treated by beta(2)-adrenergic stimulating ligands exhibit an increased, male type SDN-POA volume while male rats treated by beta1-adrenergic antagonists show a decreased, female type of SDN-POA volume.