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Search Results: 1 - 10 of 100 matches for " Sinisa; Turjacanin "
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Screen viewing, body mass index, cigarette smoking and sleep duration in Belgrade University student population: results of an observational, cross-sectional study Asociación entre el tiempo dedicado a actividades sedentarias e índice de masa corporal en estudiantes universitarios en Belgrado
Igor Pantic,Milica Malbasa,Sinisa Ristic,Drenka Turjacanin
Revista médica de Chile , 2011,
Abstract: Background: Subjects that spend more time working on computers or watching television could have a higher body mass index. Aim: To assess the relationship between time spent in front of a screen and studying, body mass index (BMI), smoking, and sleep duration among university students. Material and Methods: A cross-sectional study of 734 randomly selected students aged 21 ±2 years (450 females) that responded an anonymous, structured questionnaire about time spent watching television or in front of a computer, time spent studying, number of daily hours of sleep, smoking habits and number of daily meals. Body mass index was also calculated for all subjects Results: Among males, the number of daily sleep hours, time spent working with computers and number of daily meals were significantly higher and time spent studying was significantly lower than females. Nonsmokers ate a significantly higher number of meals and spent less time watching television. No association was observed between time spent in front of a screen and number of sleep hours of body mass index. Conclusions: Men and smokers spend more time working in computers. There is no association between body mass index and time spent in front of screens. Antecedentes: Aquellos individuos que trabajan en computadores o ven televisión por mucho tiempo pudieran tener un índice de masa corporal mayor. Propósito: Evaluar la asociación entre el tiempo ocupado viendo televisión o trabajando en el computador, índice de masa corporal, hábito de fumar y horas diarias de sue o en estudiantes universitarios. Material y Métodos: Se efectuó un estudio transversal de 734 estudiantes elegidos al azar de 21 ±2 a os de edad (450 mujeres), que respondieron una encuesta acerca del número de horas que pasaban viendo televisión, trabajando en un computator o estudiando, el número de horas diarias de sue o, hábito tabáquico y número diario de comidas. Además se calculó el índice de masa corporal de los encuestados. Resultados: Los hombres dormían más horas por día, pasaban más tiempo trabajando en computadores o viendo televisión y estudiaban menos horas por día que las mujeres. Los no fumadores comían más comidas por día y permanecían menos horas viendo televisión. No hubo una asociación significativa entre el número de horas enfrente de una pantalla o la cantidad de horas diarias de sue o con el índice de masa corporal. Conclusiones: Los hombres y los fumadores pasan más tiempo viendo televisión o trabajando en computadores. No se observó una relación entre el tiempo que se permanece frente a una pantalla y el índice de
Screen viewing, body mass index, cigarette smoking and sleep duration in Belgrade University student population: results of an observational, cross-sectional study
Pantic,Igor; Malbasa,Milica; Ristic,Sinisa; Turjacanin,Drenka; Medenica,Snezana; Paunovic,Jovana; Pantic,Senka;
Revista médica de Chile , 2011, DOI: 10.4067/S0034-98872011000700010
Abstract: background: subjects that spend more time working on computers or watching television could have a higher body mass index. aim: to assess the relationship between time spent in front of a screen and studying, body mass index (bmi), smoking, and sleep duration among university students. material and methods: a cross-sectional study of 734 randomly selected students aged 21 ±2 years (450 females) that responded an anonymous, structured questionnaire about time spent watching television or in front of a computer, time spent studying, number of daily hours of sleep, smoking habits and number of daily meals. body mass index was also calculated for all subjects results: among males, the number of daily sleep hours, time spent working with computers and number of daily meals were significantly higher and time spent studying was significantly lower than females. nonsmokers ate a significantly higher number of meals and spent less time watching television. no association was observed between time spent in front of a screen and number of sleep hours of body mass index. conclusions: men and smokers spend more time working in computers. there is no association between body mass index and time spent in front of screens.
Plasticity of crystals and interfaces: From discrete dislocations to size-dependent continuum theory
Mesarovic Sinisa ?.
Theoretical and Applied Mechanics , 2010, DOI: 10.2298/tam1004289m
Abstract: In this communication, we summarize the current advances in size-dependent continuum plasticity of crystals, specifically, the rate-independent (quasistatic) formulation, on the basis of dislocation mechanics. A particular emphasis is placed on relaxation of slip at interfaces. This unsolved problem is the current frontier of research in plasticity of crystalline materials. We outline a framework for further investigation, based on the developed theory for the bulk crystal. The bulk theory is based on the concept of geometrically necessary dislocations, specifically, on configurations where dislocations pile-up against interfaces. The average spacing of slip planes provides a characteristic length for the theory. The physical interpretation of the free energy includes the error in elastic interaction energies resulting from coarse representation of dislocation density fields. Continuum kinematics is determined by the fact that dislocation pile-ups have singular distribution, which allows us to represent the dense dislocation field at the boundary as a superdislocation, i.e., the jump in the slip filed. Associated with this jump is a slip-dependent interface energy, which in turn, makes this formulation suitable for analysis of interface relaxation mechanisms.
METASTATIC RENAL CELL ADENOCARCINOMA OF THE GALLBLADDER: A CASE REPORT
Sinisa Maksimovic
Acta Medica Saliniana , 2009, DOI: 10.5457/ams.39.09
Abstract: Background: Gallbladder (GB) involvement in patients with renal cell carcinoma (RCC) is extremely rare. Case report: We present a report of a 58-year-old man with a metachronous metastatic contralateral renal cell adenocarcinoma of the gallbladder. The patient presented with the acute right upper quadrant pain and cholecystitis three years after resection of the primary renal neoplasm. Gallbladder tumor was detected clinically. The tumor was located in the fundus of the gallblladder under the lamina propria mucosa with subserosal invasion. Blood biochemistry results were in normal ranges as well as carcinoembryonic antigen (CEA) and carbohydrate antigen 19-9 (Ca 19-9). A histopathological examination revealed that the mucosal surface was covered with yellowish fibronecrotic tissue but contained no tumor cell. The tumor was located under the lamina propria mucosa with subserosal invasion. Tumor cells were positive for PAS, vimentin and CD 10, but negative for carcinoembryonic antigen (CEA), carbohydrate antigen (Ca 19-9) and cytokeratin 7 (CK7). Additional specific and immunohistochemical tests confirmed that gallbladder tumor was a metastasis of renal cell carcinoma. Renal cell adenocarcinoma was specified as Fuhrman's grade 2. Conclusions: Pre-operative imaging studies are often futile for the differentiation between primary and secondary tumors of the gallbladder. Primary tumors of the gallbladder often coexist with gallstones while polypoid lesions in an acalculous gallbladder are frequently associated with metastasis.
Ikaros in hematopoiesis and leukemia
Sinisa Dovat
World Journal of Biological Chemistry , 2011, DOI: 10.4331/wjbc.v2.i6.105
Abstract: Ikaros is a gene whose activity is essential for normal hematopoiesis. Ikaros acts as a master regulator of lymphoid and myeloid development as well as a tumor suppressor. In cells, Ikaros regulates gene expression via chromatin remodeling. During the past 15 years tremendous advances have been made in understanding the role of Ikaros in hematopoiesis and leukemogenesis. In this Topic Highlights series of reviews, several groups of international experts in this field summarize the experimental data that is shaping the emerging picture of Ikaros function at the biochemical and cellular levels. The articles provide detailed analyses of recent scientific advancements and present models that will serve as a basis for future studies aimed at developing a better understanding of normal hematopoiesis and hematological malignancies and at accelerating the application of this knowledge in clinical practice.
The energy flow of dissipative systems on infinite lattices
Sinisa Slijepcevic
Mathematics , 2013,
Abstract: We study the energy flow of dissipative dynamics on infinite lattices, allowing the total energy to be infinite and considering formally gradient dynamics. We show that in spatial dimensions 1,2, the flow is for almost all times arbitrarily close to the set of equilibria, and in dimensions 3 or more, the size of the set with non-equilibrium dynamics for a positive density of times is two dimensions less than the space dimension. The theory applies to first and second order dynamics of elastic chains in a periodic or polynomial potential, chains with interactions beyond the nearest neighbour, deterministic dynamics of spin glasses, discrete complex Ginzburg-Landau equation, and others. We in particular apply the theory to show existence of coarsening dynamics for a class of generalized Frenkel-Kontorova models in bistable potential.
On complex positive definite functions on Z_n vanishing on squares
Sinisa Slijepcevic
Mathematics , 2008,
Abstract: We generalize the Sarkozy-Furstenberg theorem on squares in difference sets of integers, and show that, given any positive definite function f:Z_N->C with density at least r(N), where r(N)=O((\log N)^{-c}), there is a perfect square s<=N/2 such that f(s) is non-zero. We do not rely on the usual analysis of the dichotomy of randomness and periodicity of a set and iterative application of the Hardy-Littlewood method. Instead, we find a bound for the van der Corput property of the set of squares.
Stability of invariant measures
Sinisa Slijepcevic
Mathematics , 2008,
Abstract: We generalize various notions of stability of invariant sets of dynamical systems to invariant measures, by defining a topology on the set of measures. The defined topology is similar, but not topologically equivalent to weak* topology, and it also differs from topologies induced by the Riesz Representation Theorem. It turns out that the constructed topology is a solution of a limit case of a $p$-optimal transport problem, for $p=\infty$.
Stability of synchronization in dissipatively driven Frenkel-Kontorova models
Sinisa Slijepcevic
Mathematics , 2014, DOI: 10.1063/1.4928213
Abstract: We rigorously show that dissipatively driven Frenkel-Kontorova models with either uniform or time-periodic driving asymptotically synchronize for a wide range of initial conditions. The main tool is a new Lyapunov function, as well as a 2D representation of the attractor. We then characterize dynamical phase transitions and outline new algorithms for determining them.
Equipartitions of a Mass in Boxes
Sinisa Vrecica
Mathematics , 2006,
Abstract: The aim of this paper is to provide the sufficient condition for a mass distribution in R^d to admit an equipartition with a collection of hyperplanes some of which are parallel. The results extend the previously obtained results for the equipartitions with non-parallel hyperplanes.
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