Health of soft oral tissue and periodontium in biggest measure depends as well of oral hygiene. It exists the positive correlation between oral hygiena and periodontal condition. Many systemic disease, as blood disease, change reactivity of organism and also peridontium, and directly take influence at course and difficulty of periodontitis.

Oxidative stress and associated oxidative damage are mediators of vascular injury and inflammation in many cardiovascular diseases, including hypertension, atherosclerosis, ischemic heart disease, diabetes. Xanthine oxidoreductase is one of the enzymes producing free radicals in the cardiovascular system, and it can contribute to the increment of the oxidative stress and, consequently, blood pressure. The xanthine oxidase is a molybdoenzyme capable of catalyzing the oxidation of hypoxanthine and xanthine in the process of purine metabolism. Xanthine oxidase can exist in two interconvertible forms, either as xanthine dehydrogenase or xanthine oxidase. The aim of the paper was investigate the activity xanthine oxidoreductase in the plasma patients with age related cataract, with hypertensive, and with heart failure. Clinical and biochemical researches were carried out in 73 patients with age related cataract, mean age 72±7 years, divided into group with hypertensive (N=35), with heart failure (N=22) and group normotensive and without heart failure (N=16). Plasma xanthine oxidoreductase activity was determined spectrophotometrically by measuring the formation of uric acid from hypoxanthine at 293 nm. The concentration of triglycerides (TG), total cholesterol (TC), LDL-C, HDL-C in plasma were determined. Our findings show a significantly increased activity xanthine oxidoreductase in plasma hypertensive patients (XO 9.18±1.5 U/L) (p< 0.001) and patients with heart failure (XO 10.44±1.53U/L) (p< 0.001), compared with values plasma xanthine oxidoreductase activity in normotensive and patients without heart failure (XOD 6.02±1.4 U/L). Concentrations of plasma TG, TC and LDL-C were elevated in groups with hypertensive and with heart failure, and we to find significant differences with group normotensive and without heart failure values. Elevated activity of plasma xanthine oxidoreductase contribute to the increasåd oxidative stress and may play a role in accelerated atherosclerosis. 

Aim of this study was to identify the most relevant epidemiological risk factors for acquiring tularemia. Method used in the study was cross section. During period 2000-2006 at the territory of Serbia (excluding Kosovo and Metohia region) 254 tularemia cases were identified. No lethal outcomes were noted. Tularemia was registered in 11 districts of Central Serbia, while no cases of the disease were noticed in region of Vojvodina. In Serbian enclaves in Kosovo and Metohia there were 4 cases of Tularemia. 4 epidemics with 21 diseased persons were reported at territory of Central Serbia. Majority of patients were 20-60 years old (86%). No significance difference in sex distribution was observed. Almost the same number of male (129) and female (125) patients was affected. This could be explained by identical exposure of both sexes to diseases causative agents. The disease has seasonal character. It occurs most often in late autumn and winter due to contact with diseased rabbits during hunting season, meat consummation, and inhalation of dust containing diseased animal excreta. During observation period linear trend of incidence rate have not shown statistically significant elevation neither decrease.