Synthesis of Anatase Nanopowders by Sol-gel Method and Influence of Temperatures of Calcination to Their Photocatalitic Properties

The titanium dioxide (TiO2) nanopowders were produced by sol-gel technique from tetrabutyl titanate as a precursor, varying the temperature of calcination (from 500 to 550 degrees C with the step of 10 degrees C). XRPD results have shown that all synthesized nanopowders are dominantly in anatase phase. The analysis of the shift and linewidth of the most intensive anatase E-g Raman mode confirmed the XRPD results and added the presence of small amount of highly disordered brookite phase in all samples. The analysis of pore structure from nitrogen sorption experimental data described all samples as mesoporous, with mean pore diameters in the range of 1.5 and 4.5 nm. Nanopowder properties have been related to the photocatalytic activity, tested in degradation of the textile dye (C.I. Reactive Orange 16). The sample calcined at temperature of 510 degrees C showed the best photocatalytic performance

Measurement of Cosmic Radiation Exposure of Aircraft Crew At Commercial Aviation Altitudes

The measurement results of ambient dose equivalent rate in an aircraft, performed by a standard portable dosimeter, at a non-commercial flight Belgrade - Podgorica at altitudes up to 9000 meters, are shown. By numerical interpolation of the measurement results, a functional dependency of the ambient dose equivalent rate on the altitude of the airplane flight is determined, obtaining a good agreement with the reference values. For commercial airlines in the Balkan region, total ambient dose equivalent, regarding the aircraft crew occupationally exposed to radiation in the course of a flight, was calculated and the maximum permitted number of flight hours per year, was estimated

Equilibrium Mode Distribution and Steady State Distribution in Step-Index Glass Optical Fibers

Using the power flow equation, we have examined mode coupling in a step-index multimode glass optical fiber. As a result, the coupling length at which the equilibrium mode distribution is achieved and the length of fiber required for achieving the steady-state mode distribution are obtained. These lengths are much longer for glass fiber than they are for plastic optical fibers. Our results are in good agreement with experimental results reported earlier

A case report of female patient with laryngeal granuloma

© 2017, University of Kragujevac, Faculty of Science. All rights reserved. The aim of this case report is to present the laryngeal granuloma in 23 year old female patient. Case outline: The 23 year old female was admitted for examination, because of long lasting, progressive hoarseness. In anamnesis, we found that she has undergone general anesthesia for 8 times, in the early childhood. We performing direct laryngoscopy with complete otorhinolaryngologic examination, rigid endovideostroboscopy and the large granuloma of the larynx was found. Conclusions: Laryngeal granuloma of vocal cords affected mainly men, except for cases associated with laryngeal intubation. We should keep in mind that postintubation laryngeal granuloma might develop after tracheal intubation, so care must be taken to avoid the potential complication

Solid self-emulsifying phospholipid suspension (SSEPS) with diatom as a drug carrier

Abstract not availableMladen Milović, Spomenka Simović, Dušan Lošić, Andriy Dashevskiy, Svetlana Ibri

Enzymatic synthesis of galacto-oligosaccharides from whey lactose

Knežević, N., Simović, M., Bezbradica, D., Bošnjaković, J., Marinković, A., (2021) Enzymatic synthesis of galacto-oligosaccharides from whey lactose, UNIFood Conference, Belgrade, Serbie, 167

Laryngeal manifestation of Forestier’s disease

© 2016 Jasmina Stojanovic, Sandra Zivanovic, Suncica Sreckovic, Svetlana Jovanovic, Branislav Belic, Sladjana Simovic. BACKGROUND: Forestier's disease is a rare disorder involving bony growths that can occur in various parts of the spinal column, mostly asymptomatic, but these osteophytes, very rarely have been associated with serious complications. AIM: We report a 69-year-old man who was admitted at foniatric departement for evaluation of presenting hoarseness, dysphagia and laborious breathing. CASE PRESENTATION: Noninvasive endolaryngeal imaging and radiological examination revealed distortion of left side of the larynx pushing to the right due to bony mass of the anterior part of cervical spine which was prominent at the left side. The symptoms of the patient presented were caused by Forestier's disease as found by the imiging. CONCLUSIONS: In clinical practice it is advisable to take into consideration Forestier's disease as a possible cause of hoarseness and dysphagia in rare cases

Textural and rheological characteristics of dough for cookies with chestnut flour

Chestnut and chestnut-based food has beneficial nutritional and organoleptic qualities. The biochemical composition of chestnut flour is close to that of many cereals and it can be used instead of wheat flour for people who suffer from celiac disease. The aim of this research is to characterise rheological and textural properties of dough for cookies in function of the amount of chestnut flour (20, 40 and 60%) and moisture content (20, 22 and 24%). The addition of chestnut flour leads to less flexibility of dough and worse ability to recover because of bad connection and brittle consistency of the dough, which is a consequence of reduced gluten content. The gradual substitution of wheat flour with chestnut flour contributes to the elasticity of the dough, due to chestnut starch granules ability to bind water. Extensibility and resistance to extension decrease with increasing addition of chestnut flour as a result of reduction gluten content. The increase in the share of chestnut flour from 20 to 60% resulted in an increase of hardness of the dough

Systemic manifestations of pseudoexfoliation

Objective: The aim of our study was to establish a correlation between pseudoexfoliation and its systemic manifestation. Findings: Pseudoexfoliation syndrome is an agerelated systemic disorder that leads to the overproduction and accumulation of the pseudoexfoliated materials in the visceral organs and in the eye. Many vascular diseases are closely related with pseudoexfoliation manifestations. Our results indicated that there were no statistically significant differences (p>0.05) among patients regarding the presence of hypertension in all groups: PEX glaucoma - 45% (9 patients); PEX syndrome- 40% (8 patients); and control groups- 35% (7 patients). Ischemic heart disease was statistically significant present in the sPEX syndrome- 20% (5 patients) and PEX glaucoma- 25% (5 patients) patient groupss, in comparison with those of the control group-10%, (p<0.05). Aortic aneurism was statistically significant present in patients with PEX (syndrome-5% or glaucoma-15%), compared to those in the control group, which included no patients with aneurisms, (p<0.05). Our results indicated that a statistically significant number of patients with aneurism were in the group of patients who developed PEX glaucoma (p<0.05). Cerebrovascular diseases were detected in all groups of patients, but a significant decrease in this metric was noted in the control group- 5% (2 patients), compared with patients with PEX syndrome- 15% and PEX glaucoma-25%, (p<0.05). Hearing loss, as a concomitant sign of PEX manifestation, was recorded in all patients, but in the group with PEX (syndrome-55% or glaucoma-75%), these results showed a statistically significant increase (p<0.05) in comparison with those of patients in the control group (10%). Among the patients with PEX (syndrome and glaucoma), there were no statistically significant differences in the selected categories of systemic manifestations (p<0.05). This result indicates that the main risk for systemic manifestation is the presence of PEX and that other ocular and vascular complications are, in fact, consequences of PEX. Conclusion: Pseudoexfoliation is strongly related to systemic vascular disturbances. A detailed examination of patients with PEX by specialists in internal disease or by neurologists should be performed. Such recommended examinations can be helpful in the prevention of different vascular diseasess among patients with PEX, especially atthose in the early stages

Temporal variations of stroke occurence

© 2017, University of Kragujevac, Faculty of Science. All rights reserved. Stroke is one of leading causes of death worldwide. Different frequency of stroke occurence is observed in days of the week and months in the year, and incidence of stroke has irregular time pattern. We analyzed 516 patients who had acute stroke and were treated in Clinic of Neurology, Clinical Center Kragujevac from January 1, 2013 to January 1, 2014, mean age 72,11 ± 11,52. Statistical analysis is conducted out using the SPSS software version 20.0. We used descriptive statistic, student T-test, chi-square or Fisher exact test. Friday is day we found the most IS and all stroke types occurences, and Wednesday is day we found the most IS in men. We found the most strokes in women younger than 65 years on Wednesday, but in women older than 65 years on Friday. Monday is day with the most admissions to hospital for patients wiThis, and we observed that there is average delay in the refering to the doctor for 1.80 ± 1.44 days. Friday is the day with the most ICH symptom beginings and the most admissions to the hospital, and Saturday is the day with the least symptom beginings and admissions to the hospital in the case of IS and ICH. The most IS occured in winter (in Decembar), and the least in summer (in August). The most ICH occured in May, and the least in July and October. We confirmed that there is a significant weekly variability in the IS symptom onset day