The unilamellar liposomes of dimyristoylphosphatidylcholine (DMPC), marked with chlorophyll a (Chla), have been chosen as suitable models in studies aimed at determining the effects of natural ...antioxidant quercetin (QCT) and Hofmeister series anions on lipid bilayers. The variations of steady state fluorescence emission intensity of Chla have been recorded and the values of Chla fluorescence anisotropy, under constant temperature and viscosity, at pH = 7.3-7.4 have been measured. Two types of experiments have been performed. In the first type of experiment, the concentration of anions was maintained constant and the concentration of QCT was varied (from 0 to 100 micromol/l). In the second type of experiment, the concentration of QCT was constant (30 micromol/l) and the concentration of anions was varied (from 0 to 152 mmol/l). The quenching of Chla fluorescence by QCT pleads in favor of QCT insertion at interface water-lipid, in the vicinity of the polar heads of lipids from liposomal bilayer at physiological pH and temperature. Fluorescence anisotropy of Chla in liposomes brought more evidences for QCT localizations at lipid/water interface. Chla is sensing a more rigid microenvironment when QCT is added to the lipid bilayer and specific effects of the Hofmeister series anions.
Obesity Is a Major Determinant of Radiation Dose in Patients Undergoing Pulmonary Vein Isolation for Atrial Fibrillation Joris Ector, Octavian Dragusin, Bert Adriaenssens, Wim Huybrechts, Rik ...Willems, Hugo Ector, Hein Heidbüchel Our study evaluates the impact of obesity on the patient radiation dose during atrial fibrillation (AF) ablation procedures under fluoroscopic guidance. Effective radiation dose and lifetime attributable cancer risk were calculated from dose-area product measurements in 85 patients undergoing AF ablation guided by biplane fluoroscopy. Body mass index was a more important determinant of the patient radiation dose than total fluoroscopy time. Effective radiation doses for AF ablation procedures were 15.2 ± 7.8 mSv, 26.7 ± 11.6 mSv, and 39.0 ± 15.2 mSv in normal, overweight, and obese patients, respectively. Given the associated increase in carcinogenic risk, obesity needs to be considered in the risk-benefit ratio of AF ablation.
Electron beam applications in chemical processing Cojocaru, G.; Martin, D.; Dragusin, M. ...
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167),
1997, Letnik:
3
Conference Proceeding
Last results in the field of polymeric materials obtained by electron beam irradiation are presented. Two types of polymeric flocculants are described. The effects of radiation absorbed dose, ...radiation absorbed rate dose and chemical composition of the irradiated solutions upon the polymeric materials characteristics are also discussed. Preliminary results demonstrated that some polymeric flocculants characteristics, such as linearity and molecular weight were improved by using combined electron beam and microwave irradiation.
VACTERL Syndrome affects multiple body systems and can include various anomalies of the Vertebral column, Anus and/or rectum, heart (Cardiac), Tracheo-Esophagus, kidneys (Renal), and Limbs. Patients ...with VACTERL syndrome are at increased risk of having a congenital duodenal obstruction that may be extrinsic in the form of an annular pancreas or intrinsic in the form of duodenal atresia, stenosis or web. Simultaneous presentation of both the annular pancreas and duodenal web is a rare clinical entity and typically presents in neonates. However, late presentation of annular pancreas combined with a duodenal web is exceedingly uncommon. We present a case of late diagnosis of annular pancreas with duodenal web resulting in an entrapped ingested foreign body.
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