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Search Results: 1 - 10 of 130939 matches for " Cibuli? Violeta V. "
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Dynamics of the process of colour adsorption from waste waters after dyeing textile fibres on natural zeolites
CibuliVioleta V.,Stamenkovi? Lidija J.,Veljkovi? Neboj?a D.,Staletovi? Novica M.
Hemijska Industrija , 2013, DOI: 10.2298/hemind120209049c
Abstract: This study analyses the process of purifying waste waters from textile fibre dyeing by adsorption of colour on natural zeolites from “Nemetali” mine, Vranjska Banja, Serbia. The process has been analyzed in an adsorption column filled with natural zeolite as the adsorbent. Adsorbents are organic substances, i.e. colour residues from waste waters, left after textile fibres dyeing. The concentration change in waste waters is represented with the parameter of chemical oxygen demand (COD). Two models of diffusion have been considered: diffusion in pores and diffusion in adsorbent phase on solid adsorbent, for different input loads and two zeolite granulations (13 and 35 mm). It was found that the diffusion in zeolite pores that were in adsorbed phase is dominant in this case, which can be explained by large dimensions of used colours’ molecules. This is the reason why its adsorption in zeolite micro pores is minimal, and yet it diffuse well in already adsorbed phase on solid adsorbents. Since this process is slower, it will determine the overall rate of colour adsorption from waste waters. Specific equilibrium capacity, specific dynamic capacity, as well as the level of adsorbent utilization were determined by the use of mass transfer zone concept. It has been shown that the adsorption of organic substances from waste waters is satisfactory, and is around 80%. The highest degree of adsorbent utilization is obtained at the lowest flow of 0.167 cm3 s-1, while the lowest degree of utilization of 30%, is obtained at the highest flow of 3.27 cm3 s-1. Input load has significant influence on the degree of column utilization, while higher values of COD0 result in lower degrees of column utilization. Key words: waste waters, natural zeolite, adsorption, colour adsorption, textile dyes
Knowledge and Risk Perception toward HIV/AIDS among Students of the University of Prishtina “Hasan Prishtina”  [PDF]
Violeta Zefi
Psychology (PSYCH) , 2015, DOI: 10.4236/psych.2015.63018
Abstract: The primary goal of this research paper is to examine knowledge about HIV/AIDS and the perceived risk of infection with HIV among students in Kosovo. The research method used in this study is the quantitative one where data were collected through questionnaire. The survey was conducted with two hundred students of the University of Prishtina “Hasan Prishtina”, from four study fields: Department of Psychology, Faculty of Medicine, Department of Chemistry and Faculty of Electrical and Computer Engineering. Knowledge about HIV/AIDS among students was not complete, i.e. they have misconceptions regarding the ways of transmission of HIV virus. The less that students were informed on HIV/AIDS, the higher was their level of stigma. Perception of risk to HIV/AIDS was very low.
A multi-component model of the dynamics of salt-induced hypertension in Dahl-S rats
Violeta I McLoone, John V Ringwood, Bruce N Van Vliet
BMC Physiology , 2009, DOI: 10.1186/1472-6793-9-20
Abstract: The first component of the model ("Acute-Reversible") consisted of a linear transfer function to account for the rapid and reversible effects of salt on BP (ie. acute salt sensitivity, corresponding with a depressed slope of the chronic pressure natriuresis relationship). For the second component ("Progressive-Irreversible"), an integrator function was used to represent the relatively slow, progressive, and irreversible effect of high salt intake on BP (corresponding with a progressive salt-induced shift of the chronic pressure natriuresis relationship to higher BP levels). A third component ("Progressive-Reversible") consisted of an effect of high salt intake to progressively increase the acute salt-sensitivity of BP (ie. reduce the slope of the chronic pressure natriuresis relationship), amounting to a slow and progressive, yet reversible, component of salt-induced hypertension. While the 3 component model was limited in its ability to follow the BP response to rapid and/or brief transitions in salt intake, it was able to accurately follow the slower steady state components of salt-induced BP changes. This model exhibited low values of mean absolute error (1.92 ± 0.23, 2.13 ± 0.37, 2.03 ± 0.3 mmHg for data sets 1 - 3), and its overall performance was significantly improved over that of an initial model having only 2 components. The 3 component model performed well when applied to data from hybrids of Dahl salt sensitive and Dahl salt resistant rats in which salt sensitivity varied greatly in its extent and character (mean absolute error = 1.11 ± 0.08 mmHg).Our results suggest that the slow process of development of salt-induced hypertension in Dahl-S rats over a period of many weeks can be well represented by a combination of three components that differ in their timing, reversibility, and their associated effect on the chronic pressure natriuresis relationship. These components are important to distinguish since each may represent a unique set of underlying mecha
Biocompatibility of a new nanomaterial based on calcium silicate implanted in subcutaneous connective tissue of rats
Petrovi? Violeta,Opa?i?-Gali? Vanja,Jokanovi? V.,Jovanovi? M.
Acta Veterinaria , 2012, DOI: 10.2298/avb1206697p
Abstract: The aim of the study was to investigate rat connective tissue response to a new calcium silicate system 7, 15, 30 and 60 days after implantation. Twenty Wistar albino male rats received two tubes half-filled with a new calcium silicate system (NCSS) or MTA in subcutaneous tissue. The empty half of the tubes served as controls. Five animals were sacrificed after 7, 15, 30 and 60 days and samples of the subcutaneous tissue around implanted material were submitted to histological analysis. The intensity of inflammation was evaluated based on the number of inflammatory cells present. Statistical analysis was performed using one way ANOVA and Holm Sidak's multiple comparison tests. Mild to moderate inflammatory reaction was observed after 7, 15 and 30 days around a NCSS while mild inflammatory reaction was detected after 60 days of implantation. In the MTA group, mild to moderate inflammatory reaction was found after 7 and 15 days while mild inflammatory reaction was present after 30 and 60 days. There was no statistically significant difference in the intensity of inflammatory reactions between the tested materials and control groups in any experimental period (ANOVA p>0.05). Regarding the intensity of inflammatory reactions at different experimental periods, a statistically significant difference was observed between 7 and 30 days, 7 and 60 days and 15 to 60 days for both materials. For the controls, a statistically significant difference was found between 7 and 60 days and 15 and 60 days of the experiment (Holm Sidak < p 0.001). Subcutaneous tissue of rats showed good tolerance to a new calcium silicate system. Inflammatory reaction was similar to that caused by MTA. [Projekat Ministarstva nauke Republike Srbije, br. 172026]
Morpho-anatomical differentiation of the Balkan endemic species Teucrium arduini L. (Lamiaceae)
Laku?i? Branislava,Laku?i? D.,Slavkovska Violeta,Stevanovi? V.
Archives of Biological Sciences , 2007, DOI: 10.2298/abs0704369l
Abstract: Teucrium arduini L. is an endemic of the Mediteranean to sub-Mediterranean part of the Western Balkans. The ecological plasticity, i.e., inter-population differentiation, of the species Teucrium arduini was analyzed on the basis of morpho-anatomical variability of six populations from different types of vegetation, i.e., of rocky crevices, rocky ground, and a thermophilous forest in the eu-Mediterranean, sub-Mediterranean, and transitional sub-Mediterranean-Central-European climate zones. Univariant statistic analysis included 22 quantitative characters related to leaf and stem anatomy and morphology. In order to establish the variability and significance of morpho-anatomical differentiation, principal component analyses (PCA), multivariant analyses of variances (MANOVA), and discriminant components analysis (DCA) were done. The analyses of plants from these spatially separated populations confirmed that the species T. arduini belongs to the category of xerophytes with malacophyllous leaves.
Analytical application of derivative spectrophotometry
GORDANA V. POPOVIC,LIDIJA B. PFENDT,VIOLETA M. STEFANOVIC
Journal of the Serbian Chemical Society , 2000,
Abstract: 1. Introduction 2. Basic characteristics of derivative spectrophotometry 2.1. Increase of spectra resolution 2.2. Elimination of the influence of baseline shift and matrix interferences 2.3. Enhancement of the detectability of minor spectral features 2.4. Precise determination of the positions of absorption maxima 2.5. Signal-to-noise ratio (SNR) 2.6. Quantitative analysis 3. Analytical applications 3.1. Inorganic analysis 3.2. Organic and pharmaceutical analysis 3.3. Analysis of food and water 3.4. Application of derivative spectrophotometry for the determination of equilibrium constants
Demencia por déficit de vitamina B12: Caso clínico
Behrens P,María Isabel; Díaz T,Violeta; Vásquez V,Carolina; Donoso S,Archibaldo;
Revista médica de Chile , 2003, DOI: 10.4067/S0034-98872003000800012
Abstract: cyanocobalamin (vitamin b12) deficiency can cause polyneuropathy, myelopathy, blindness, confusion, psychosis and dementia. nonetheless, its deficiency as the sole cause of dementia is infrequent. we report a 59 years old man with a 6 months history of progressive loss of memory, disorientation, apathy, paranoid delusions, gait difficulties with falls, and urinary incontinence. he had suffered a similar episode 3 years before, with a complete remission. on examination there was frontal type dementia with korsakoff syndrome, a decrease in propioception and ataxic gait. cerebrospinal fluid examination showed a protein of 0.42 g/l. brain computed tomography showed sequelae of a frontal left trauma. brain single photon computed tomography (spect) was normal. complete blood count showed a macrocytic anemia with a hematocrit 29% and a mean corpuscular volume of 117 μ3. plasma vitamin b12 levels were undetectable, erythrocyte folate levels were 3.9 ng/ml and plasma folate was normal. the myelogram showed megaloblastosis and the gastric biopsy showed atrophic gastritis. treatment with parenteral b12 vitamin and folic acid reverted the symptoms, with normalization of the neuropsychological tests and reintegration to work (rev méd chile 2003; 131: 915-9)
Efficient way in early detection of malignant skin tumors by applying epiluminescence microscopy in skin screening
Nikoli? Dejan V.,Nikoli? Aleksandra T.,Stanimirovi? Violeta V.,Grani? Miroslav K.
Medicinski Pregled , 2008, DOI: 10.2298/mpns0810507n
Abstract: Screening is the identification of a preclinical disease by a relatively simple test. It is usually regarded as public health policy that is applied to population. The aim is to identify disease not recognized by the health services and the term preclinical refers rather to such an unrecognized disease than to clinical detectability or recognition. The majority of pigmented lesions of the skin can be diagnosed on the basis of clinical criteria, although there is an astonishing number of discrete pigmented lesions where the difference between melanocytic and non-melanocytic, benign and malignant lesions, melanoma and non-melanoma, is very hard or almost impossible to detect by a simple examination with the naked eye. With the use of the computer system for melanomoscopy and melanomography, Mole Max IITM, with digital epiluminescence microscopy, it is possible to see and record the changes on the skin that are located in the surface layer of the skin, as well as the changes that appear more deeply under the surface, on the border between the epidermis and the dermis, the place where melanocytes are placed. With such examination it is possible to differentiate benign from malignant lesions in the very early stage of the development. An early recognition of malignant alterations on the skin increases the chances of cure and total recovery to over 90%.
Demencia por déficit de vitamina B12: Caso clínico Dementia caused by vitamin B12 deficiency: Report of one case
María Isabel Behrens P,Violeta Díaz T,Carolina Vásquez V,Archibaldo Donoso S
Revista médica de Chile , 2003,
Abstract: Cyanocobalamin (vitamin B12) deficiency can cause polyneuropathy, myelopathy, blindness, confusion, psychosis and dementia. Nonetheless, its deficiency as the sole cause of dementia is infrequent. We report a 59 years old man with a 6 months history of progressive loss of memory, disorientation, apathy, paranoid delusions, gait difficulties with falls, and urinary incontinence. He had suffered a similar episode 3 years before, with a complete remission. On examination there was frontal type dementia with Korsakoff syndrome, a decrease in propioception and ataxic gait. Cerebrospinal fluid examination showed a protein of 0.42 g/L. Brain computed tomography showed sequelae of a frontal left trauma. Brain single photon computed tomography (SPECT) was normal. Complete blood count showed a macrocytic anemia with a hematocrit 29% and a mean corpuscular volume of 117 μ3. Plasma vitamin B12 levels were undetectable, erythrocyte folate levels were 3.9 ng/ml and plasma folate was normal. The myelogram showed megaloblastosis and the gastric biopsy showed atrophic gastritis. Treatment with parenteral B12 vitamin and folic acid reverted the symptoms, with normalization of the neuropsychological tests and reintegration to work (Rev Méd Chile 2003; 131: 915-9)
Spectral results for operators commuting with translations on Banach spaces of sequences on Zk and Z+
Petkova,Violeta;
Cubo (Temuco) , 2012, DOI: 10.4067/S0719-06462012000300002
Abstract: we study the spectrum of multipliers (bounded operators commuting with the shift operator ) on a banach space of sequences on . given a multiplier , we prove that where is the symbol of . we obtain a similar result for the spectrum of an operator commuting with the shift on a banach space of sequences on . we generalize the results for multipliers on banach spaces of sequences on .
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