Dušan Todorović
University of Belgrade
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Featured researches published by Dušan Todorović.
Waste Management & Research | 2012
Roger A. Khalil; Dušan Todorović; Øyvind Skreiberg; Michael Becidan; Rainer Backman; Franziska Goile; Alexandra Skreiberg; Lars Sørum
In an attempt to look at means for reduction of corrosion in boilers, combustion experiments are performed on demolition wood with kaolin as additive. The experiments were performed in a multi-fuel reactor with continuous feed of pellets and by applying staged air combustion. A total characterization of the elemental composition of the fuel, the bottom ash and some particle size stages of fly ash was performed. This was done in order to follow the fate of some of the problematic compounds in demolition wood as a function of kaolin addition and other combustion-related parameters. In particular chlorine and potassium distribution between the gas phase, the bottom ash and the fly ash is reported as a function of increased kaolin addition, reactor temperature and air staging. Kaolin addition of 5 and 10% were found to give the least aerosol load in the fly ash. In addition, the chlorine concentration in aerosol particles was at its lowest levels for the same addition of kaolin, although the difference between 5 and 10% addition was minimal. The reactor temperature was found to have a minimal effect on both the fly ash and bottom ash properties.
Archive | 2018
Marta Trninić; Dušan Todorović; Aleksandar Jovović; D Dragoslava Stojiljkovic; Øyvind Skreiberg; Liang Wang; Nebojša Manić
The paper presents a simple mathematical model for designing, optimizing and simulating small–medium CHP scale plant with use of biomass waste downdraft gasification. A downdraft gasifier has been used as the starting point in the study, due to its low tar content and effective way of using heat in the engine’s exhaust gases to dry and pyrolyze the different solid biomass waste. Hot water from the cooling circuit of the engine and from producer gas cooling is directly used for the district heating network, air or steam preheating. The mathematical model includes modelled components as a downdraft gasifier, an internal combustion engine using the characteristic equation approach method. The mathematical model enables the outputs of the plant to be evaluated and calculated for different types of biomass and operating conditions. The results demonstrate that it is a useful tool for assessing the performance of CHP plants using several types of biomass waste and enables comparisons to be made between operating conditions for real applications.
Molecular Biology Reports | 2018
V. Šćepanović; G. Tasić; N. Repac; I. Nikolić; A. Janićijević; Dušan Todorović; Marija Stojanović; R. Šćepanović; Dušan Mitrović; T. Šćepanović; Sunčica Borozan; Lj. Šćepanović
Cerebral aneurysm affects 2–5% of the population and posterior inferior cerebellar artery (PICA) aneurysms account for 1–3% of all intracranial aneurysms. Oxidative stress is known to contribute to the progression of cerebrovascular disease and it may be increased by inflammation, a key contributor to cerebral aneurysm development and rupture. The aim of this study was to examine the role of overall oxidative stress as a risk factor for rupture of PICA aneurysms. This study included 29 patients with PICA aneurysms: 18 ruptured and 11 unruptured. We determined catalase, malondialdehyde, myeloperoxidase and carbonyl groups in homogenates of excised aneurysm tissue after surgery and plasma levels of C reactive protein and fibrinogen. The patient’s age and sex, size of aneurysms, multiplicity, history of previous subarachnoidal hemorrhage (SAH) and risk factors for oxidative stress such as hypertension and smoking were compared between unruptured and ruptured aneurysms. Maximal diameter and SAH history were independent predictors for aneurysm rupture. Activity of catalase was decreased while activity of myeloperoxidase, levels of malondialdehyde, carbonyl groups in aneurismal tissue and plasma levels of C reactive protein and fibrinogen were increased in patients with ruptured aneurysms. Plasma levels of C reactive protein and fibrinogen showed positive correlation with myeloperoxidase, malondialdehyde, carbonyl groups and PHASES score and negative correlation with catalase. These findings suggest that oxidative stress may contribute importantly to rupture of PICA aneurysms and plasma levels of C reactive protein and fibrinogen correlate with oxidative stress markers in tissue.
Medicinski Podmladak | 2016
Lara Hadži-Tanović; Dušan Todorović; Marija Stojanović; Ljiljana Šćepanović; Dragan Đurić
Introduction: Methionine is an essential sulfuric amino acid, which, according to numerous studies, has a role in the reduction of inflammation, caused by changes in colon, and inhibits important pathways in the development of numerous gastrointestinal disorders. However, subchronic methionine loading leads to oxidative stress, which is a potential cause of disease of numerous organs, digestive tract being one of them. N-acetyl-L-cysteine is a natural antioxidant, which affects some of the important signaling pathways and has a potential therapeutic role in treatment of colon disorders. Aim: To examine the influence of N-acetyl-L-cysteine on histological parameters of rat colon, after subchronic methionine load. Material and methods: Experiments were conducted on 15-20 days old male (Wistar albino) rats, weighing 160 g. There were used 24 animals in the experiment, divided into 3 groups, with eight animals per group. First, control group (K), received NaCl, second group received methionine (M group), while third group received methionine + N-acetyl-L-cysteine (N group). The rats were sacrificed after 21 day and tissue samples of colon were obtained. In all of the three groups, changes of histological parameters of rat colon were analyzed. Results: Methionine load leads to statistically significant increase (p < 0.01) in crypt depth of rat colon, lamina muscularis mucosae thickness, the mucosal thickness and increase in lamina propria cell density compared to control, while N-acetyl- L-cysteine application showed statistically significant decrease (p < 0.01) of these histological parameters compared to M group. Conclusion: N-acetyl-L-cysteine has a significantly protective effect on methionine load induced changes in rat colon.
Fuel | 2012
Ehsan Houshfar; Øyvind Skreiberg; Dušan Todorović; Alexandra Skreiberg; Terese Løvås; Aleksandar Jovović; Lars Sørum
Energy & Fuels | 2011
Ehsan Houshfar; Øyvind Skreiberg; Terese Løvås; Dušan Todorović; Lars Sørum
Fuel Processing Technology | 2013
Rainer Backman; Roger A. Khalil; Dušan Todorović; Øyvind Skreiberg; Michael Becidan; Franziska Goile; Alexandra Skreiberg; Lars Sørum
Biomass & Bioenergy | 2012
Michael Becidan; Dušan Todorović; Øyvind Skreiberg; Roger A. Khalil; Rainer Backman; Franziska Goile; Alexandra Skreiberg; Aleksandar Jovović; Lars Sørum
Molecular and Cellular Biochemistry | 2018
Marija Stojanović; Ljiljana Šćepanović; Dušan Todorović; Dušan Mitrović; Vuk Šćepanović; Radomir Šćepanović; Slobodan Ilic; Teja Šćepanović; Milica Labudović Borović; Živana Milićević; Vesna Dragutinović; Sunčica Borozan; Ivana Lalić; Sanja Z. Despotović; Dragan Djuric
Molecular and Cellular Biochemistry | 2018
Marija Stojanović; Dušan Todorović; Lj. Šćepanović; Dušan Mitrović; Sunčica Borozan; Vesna Dragutinović; Milica Labudovic-Borovic; Danijela Krstić; Mirjana Čolović; Dragan M. Djuric