[Some problems of human gas balance].

The authors have presented gas balance in extracorporeal pulmonary. The diffusion speed by pulmonary membrane alveoli is dependent from: particles metility, surface diffusion of pulmonary alveoli, alveolocapillary thickness, hemoglobin chemical affinity is dependent from blood temperature and pH.

[The role of free radicals].

Authors describe action of free oxygenic radicals on human body Syndromes in which pathomechanisms free radicals action is probable are listed. Syndromes of neonatal period where significant role of free radicals is noted are described: bronchopulmonary dysplasia, intraventricular and paraventricular bleedings, extracorporeal fibrosis, necrotic enteritis.

[Activity of antioxidant enzymes and the role of antioxidant vitamins in Alzheimer disease].

Oxidative stress has been implicated in the pathogenesis of certain diseases, such as Alzheimer's disease. Disturbance in the prooxidant/antioxidant balance increases during aging moreover the production of free radicals is alleged to play a significant role in this neurodegenerative process. Because Alzheimer's disease applies to elderly people, the aim of this publication was to explore the connection between oxidative stress and its influence on the aging process.