PubMed Health⌕ Search

Biomedical subjects

J Hupka

Publications and source records attributed to J Hupka.

18 recordsLinked to original sources
PubMed2004

H2O2/UV enhanced degradation of pesticides in wastewater.

Photodegradation of organic pesticides in industrial wastewater was examined in a UV/H2O2/air system. An experimentally determined optimal amount of hydrogen peroxide (0.008% v/v) indicates that hydrogen peroxide concentration controlled the efficiency of photodegradation. Pre-treatment operations such as sedimentation, filtration and coagulation were used to obtain better efficiency of pesticide removal and to cut down on irradiation time. Finally, scale-up experiments in the air-sparged hydrocyclone (ASH) reactor were carried out. After 5 min irradiation of 100 dm3 industrial wastewater almost all pesticides were destroyed. Thus the ASH reactor proved to be an effective contactor for carrying out photochemical reactions.

Gases↗
PubMed2000

Chloride ions formation during degradation of organochloride compounds using TiO2 deposited on glass microspheres.

Aqueous solutions containing 200 mg/dm3 of p,p'-DDT and methoxychlor were photodegraded for 60 min in UV/TiO2/O2 system and chloride ions concentration and pH were measured. From 60 to 80% of the investigated pesticides were eliminated after treatment. Over 27% of chlorine atoms were splitted off for methoxychlor and 10% for p,p'-DDT. The experimental data suggest, that chlorine atoms were removed from the -CCl3 moiety but the chlorine atoms bound to aromatic ring were left intact at this step of photodegradation.

Chlorides↗
PubMed2000

H2O2/UV/air oxidation of organic contaminants in the gas-sparged cyclone reactor.

In the last decade advanced oxidation processes (AOPs) have been gaining importance for destruction of waste as cleaner methods enabling conversion of organic contaminants to harmless species. Photodegradation processes in the presence of hydrogen peroxide (H2O2), ozone (O3) and titanium dioxide (TiO2) are most frequently offered for wastewater treatment. The novel gas-sparged reactor equipped with UV lamp proved to be an efficient system for photochemical degradation. In this investigation 80 ppm aqueous solution of phenol was treated for 40 minutes. 13% of phenol was eliminated in the UV/air system and 73% in the UV/H2 O2/air system at 80 l/min air flowrate. Air sparging did not result in phenol removal with the gas phase.

Air↗
PubMed1981

[Influence of aging on glucose tolerance and insulin secretion (author's transl)].

Oral and intravenous glucose tolerance tests were performed in three different age groups, separately for men and women. Blood glucose and insulin levels were examined. Advanced age is associated with reduced glucose tolerance independent whether it is investigated by means of intravenous or oral glucose application. Concomitant examination of plasma insulin, however, differentiates between the intravenous and the oral glucose tolerance test. While the high insulin levels after oral glucose administration are rather increasing with age, the minor insulin reaction after the intravenous glucose route is decreasing with advancing age. Results of the intravenous and the oral glucose tolerance test reveal no difference between male and female subject as long as blood sugar is examined. However, insulin levels and the insulinogenic index are consistently higher in men than in women.

Adult↗
PubMed1975

Ballistocardiographic changes after carbon dioxide baths.

Ballistocardiography was used for following up the changes in cardiovascular dynamics in 2 groups of patients suffering from hypertensive disease stage II. In a group of hypertensive patients who took CO2 baths for 28 days, or improvement of the pathologically altered Bcg showed with a simultaneous decrease in blood pressure and pulse rate for a better dynamics of the cardiac function. In the group of hypertensive patients taking isothermic tap-water baths under identical conditions, the same trend in the Bcg changes was found, but these changes were not statistically significant.

Ballistocardiography↗
PubMed1975

Changes in the ballistocardiogram in pulmonary hypertension.

A comparison of Bcg changes was made between a group of healthy individuals, a group of pneumopaths with normal blood pressure in the pulmonary artery at rest and another group of pneumopaths with pulmonary hypertension at rest. The tension in the pulmonary artery was measured by venous catheterization. It was found that: (1) the H wave of the Bcg was significantly higher in both groups of pneumopaths than in the group of healthy individuals, and (2) the L wave was significantly higher in pneumopathics with pulmonary hypertension at rest than in pneumopaths with pulmonary normotension and healthy individuals.

Adult↗