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Search Results: 1 - 10 of 226898 matches for " Be?eli?-Tomin Milena R. "
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Degradation of industrial azo dye in aqueous solution by heterogeneous Fenton process (fly ash/H2O2)
Be?eli?-Tomin Milena R.,Dalmacija Milena B.,Dalmacija Bo?o D.,Raji? Ljiljana M.
Hemijska Industrija , 2012, DOI: 10.2298/hemind111126113b
Abstract: The aim of this study was to investigate the possibilities and efficiency of heterogeneous Fenton process with the use of fly ash from thermal power plants Kolubara, Serbia, as the catalyst in the degradation of industrial azo dye Zetanyl Rosso B-NG. The effects of various experimental parameters such as pH, temperature, concentration of fly ash, the initial concentration of H2O2 and initial concentration of dye on the kinetics and efficiency of decolorization were investigated. Simultaneous leaching of iron from fly ash was monitored. The optimum conditions had been determined, and it was found that decolorization efficiency obtained after 150 min of reaction, was about 98.9%. The optimal parameters were: initial pH = 3; [H2O2]0 = 6 mM; dosage of fly ash = 0.1g/l (for dye concentration of 100 mg/l); temperature = 22 °C. The effectiveness of the applied treatment for mineralization of dye solution was investigated, under optimal conditions determined by the examination of various factors influencing the decolorization process at the specified contact time. The maximum achieved reduction of total organic carbon content was 96.5%. The results indicate that the reuse of fly ash as the catalyst support in OH production in this process achieves significant efficiency in terms of decolorization, 94.4% and mineralization, 89.6%. Futhermore, fly ash showed adequate stability during the reaction (low iron leaching, concentrations under optimal reaction condition were about 2 mg/l).
Preoperative preparation of the patient with the abnormalities of red and white blood cells
Tomin Dragica
Acta Chirurgica Iugoslavica , 2011, DOI: 10.2298/aci1102077t
Abstract: The complete peripheral blood count analysis including laboratory screening tests of haemostasis and coagulation should be done in every patient before surgery, in order to detect specific abnormalities for primary or secundary haematologic disorder. These abnormalities might be very important couse of perioperative and postoperative complications. Anaemia is the most frequent haematologic abnormality seen during preoperative period. Therapy approach depends on the type and anaemia degree, and also on the type and time of surgery. If surgery is not urgent specific therapy according to the anaemia type (iron therapy, vitamin B12, folic acid, corticosteroids, recombinant erythropoietin) should be given in all anaemias with deficiency of iron, megaloblastic anaemias, acquired haemolytic anaemias and anaemias in end stage renal disease. Transfusion of red cells are most frequently given in patients with normovolemic anaemias with haemoglobin level of 10,0g/dl and hematocrit of 0,30, but lower levels in haemodynamic stable patients. Venesections should be done in patients with erythrocytosis in order to reduce total red cell volume, but taking into account the perioperative bleeding. Patients with leukocyte abnormalities suspected on primary haematologic disorder need urgent haematologic diagnostic procedures. In patients with leucocytosis the actual level of neutropenia is the bigger problem than the level of leucocytosis. In those patients treatment generally involves preventing infections, managing of febrile neutropenia with broad spectrum antibiotics and antifungal drugs, treatment with recombinant granulocyte hematopoetic factor, rarely transfusions of granulocyte concentrates and intravenous immunoglobulins.
Evaluation of the effects of ephedrine on human lymphocytes in the comet assay
Radakovi? Milena,eli? N.,Stanimirovi? Z.,Ple?a?-Solarovi? Bosiljka
Acta Veterinaria , 2011, DOI: 10.2298/avb1104363r
Abstract: Ephedrine, a natural alkaloid from plants of the genus Ephedra, has a chemical structure similar to catecholamines. It is well established that catecholamines (adraneline, noradrenaline and dopamine) cause genotoxic and mutagenic effects. Therefore, the objectives of this investigation were to examine weather ephedrine can exhibit genotoxic effects on isolated human lymphocytes in the Comet assay. Dose-response of human lymphocytes was determined at the concentration range of ephedrine from 0.0005 μM to 500 μM. Three concentrations of ephedrine (1, 50 and 300 μM) which had acceptable cell viability (over 90%) were used for further experiments with inhibitors of DNA reparation (cytosine arabinoside and hydroxyurea). The obtained results showed that ephedrine did not induce DNA damage in isolated human lymphocytes. However, co-treatment of the negative control with DNA repair inhibitors caused a slight but significant increase of DNA damage, due to an endogenous DNA damage. Interestingly, cells treated with ephedrine and DNA repair inhibitors did not express increased DNA damage. On the basis of the obtained results it can be concluded that ephedrine did not exhibit genotoxic effects on isolated human lymphocytes. This result is in accordance with previous investigations showing negative genotoxicological results for ephedrine using bacterial gene mutation test-systems and in vitro cytogenetic analysis.
Long term follow up of splenectomised patients with idiopathic thrombocytopenic purpura
Elezovi? Ivo V.,Bo?kovi? Darinka V.,?olovi? Milica R.,Tomin Dragica S.
Acta Chirurgica Iugoslavica , 2002, DOI: 10.2298/aci0203029e
Abstract: Splenectomy is definitive treatment for idiopathic thrombocytopenic purpura (ITP) because it removes both the sites of autoantibody producing cells and also the major site of platelet destruction. The purpose of this study was to evaluate long term results of splenectomised patients with ITP and to determine predictor factors for good response. A 167 patients with chronic ITP (136 females, 31 males), median aged 35 years (17-74) was splenectomised after 2 to 160 months (Median 12) from diagnosis of ITP. Indications for splenectomy were: 6 weeks of steroid therapy with platelet count below 10x10^9/l or 3 months with platelet count under 30xl0^9/l, or treatment with prednisone above 30 mg more of 6 months to increase platelet count over 30x10^9/l, or repeated relapses. Postoperative complications developed in 16 patients (9.5%), 3 of them died (1.8%) due to thromboembolism and 17 patients discontinued later controls. During follow up to 172 months (Median 62) 111/147 splenectomised patients were in remission (75.5%), 99 in complete (above 100x10^9/l), 12 in partial (50-100x109/l) and 36 patients (24.5%) were relapsed (below 50x10^9/l). Remission was achieved in 79/88 patients (89.8%) with good response to prednisone before splenectomy toward 32/62 patients (51.6%) with poor response to prednisone (p<0.01). Remission was obtained in 9/11 patients (81.8%) who responded well to intravenous immune globulin (0.4 g/kg x 5d) and only in 1/8 who did not (p<0.05). Higher response rate was achieved in patients under 40 years of age (81.6%) than in older ones (63.4%) (p<0.05). No difference was shown between sex and time intervals (3, 6, 12, 24, 36 or over 36 months) from diagnosis to splenectomy. Splenectomy is an effective treatment of refractory ITP with response rate of 75.5% after median follow up of 62 months. In our patients better results on splenectomy were associated with age less than 40 years, good responses to steroid, and intravenous immune globulin.
Rotation of PRODAN in excited state
Vladimir I. TOMIN
Optica Applicata , 2006,
Abstract: Instant spectra and anisotropy kinetics of PRODAN luminescence in different ranges of spectra has been studied upon excitation by picosecond pulses. Instant spectra of luminescence reveal time dependent Stokes shift having intermolecular nature as its characteristic time correlates with dielectric relaxation time of solvent. The mean Brownian rotation time for the curves obtained shows complex character of spectral dependence with maximum ~39 ns near maximum of luminescence intensity and drops down to 15 ns on the edges of the spectrum. An explanation is based on a treatment of intermolecular energy conversion into thermal movement of molecules during relaxation in excited state. Calculations using hydrodynamic model show “stick” boundary conditions for solutes: rotational volumes correspond to solute together with molecules of the first coordinative sphere filled by solvent.
Empresariado e estratégias de desenvolvimento
Diniz, Eli;Boschi, Renato R.;
Revista Brasileira de Ciências Sociais , 2003, DOI: 10.1590/S0102-69092003000200002
Abstract: this paper analyses the development strategies as perceived by representative tendencies of the industrial entrepreneurial establishment after market-oriented reforms, having in sight the redefinition that occurred in the role of the economical factors facing the state and the international context with the processes of privatization and commercial opening. the first part focus on the main aspects of the changes that have affected the brazilian productive structure, especially the volume of transactions that changed the relative weight of foreign investments compared to the domestic capital. another structural aspect is enhanced in the second part, which is the reconfiguration of the structure of representation of interests, which started to operate predominantly in a way of voluntary enrolment and the operation of selective incentives. finally, the third part concentrates on proposals about the so-called alternative ways of development by the entrepreneurial leaderships and the formation of possible coalitions able of sustaining different strategies.
The effect of ungulate grazing on a small mammal community in southeastern Botswana
Eli R. Saetnan,Christina Skarpe
African Zoology , 2011,
Abstract: Ungulates can reduce the quantity of food available for other herbivores in general or reduce the available cover for small mammals in particular. On the other hand, browsing and grazing may facilitate foraging by other mammals if the quality and palatability of young re-sprouting tissue is high. An exclosure experiment was set up in Mokolodi Nature Reserve, Botswana, to study ecological effects of large herbivores on the small mammal community. Specifically, we attempted to answer the following questions: 1) are population sizes and community composition of small rodents affected by the exclusion of large herbivores?; 2) if so, what changes in the environment caused by the exclusion of large herbivores are related to changes in small mammal populations?; 3) in what way do such changes in the environment affect small mammals? The populations were significantly larger in the exclosures than in the control areas. A higher number of species was also found in the exclosures. It seems that the smaller populations of small mammals in areas with large herbivores are a result of a reduction in vegetation cover. In general, the exclosures had a higher grass cover than their paired controls. This same relation also held for percentage cover of litter and dead grass.
Empresariado e estratégias de desenvolvimento
Diniz Eli,Boschi Renato R.
Revista Brasileira de Ciências Sociais , 2003,
Abstract: Este trabalho consiste em uma análise das estratégias de desenvolvimento na percep o de correntes representativas do empresariado industrial após as reformas orientadas para o mercado, tendo em vista a redefini o ocorrida no papel dos atores econ micos ante o Estado e o contexto internacional com os processos de privatiza o e abertura comercial. A primeira parte focaliza os principais aspectos das mudan as que afetaram a estrutura produtiva brasileira, sobretudo o volume das transa es que alteraram o peso relativo dos investimentos estrangeiros em face do capital doméstico. Outro aspecto estrutural, destacado na segunda parte, consiste na reconfigura o da estrutura de representa o de interesses, que passou a operar predominantemente no marco da ades o voluntária e da opera o de incentivos seletivos. Finalmente, a terceira parte concentra-se nas propostas acerca de vias alternativas de desenvolvimento por parte das lideran as empresariais e na forma o de possíveis coaliz es capazes de sustentar diferentes estratégias.
Multiscale metabolic modeling of C4 plants: connecting nonlinear genome-scale models to leaf-scale metabolism in developing maize leaves
Eli Bogart,Christopher R. Myers
Quantitative Biology , 2015,
Abstract: C4 plants, such as maize, concentrate carbon dioxide in a specialized compartment surrounding the veins of their leaves to improve the efficiency of carbon dioxide assimilation. Nonlinear relationships between carbon dioxide and oxygen levels and reaction rates are key to their physiology but cannot be handled with standard techniques of constraint-based metabolic modeling. We demonstrate that incorporating these relationships as constraints on reaction rates and solving the resulting nonlinear optimization problem yields realistic predictions of the response of C4 systems to environmental and biochemical perturbations. Using a new genome-scale reconstruction of maize metabolism, we build an 18000-reaction, nonlinearly constrained model describing mesophyll and bundle sheath cells in 15 segments of the developing maize leaf, interacting via metabolite exchange, and use RNA-seq and enzyme activity measurements to predict spatial variation in metabolic state by a novel method that optimizes correlation between fluxes and expression data. Though such correlations are known to be weak in general, here the predicted fluxes achieve high correlation with the data, successfully capture the experimentally observed base-to-tip transition between carbon-importing tissue and carbon-exporting tissue, and include a nonzero growth rate, in contrast to prior results from similar methods in other systems. We suggest that developmental gradients may be particularly suited to the inference of metabolic fluxes from expression data.
The temporal dipole moments of solute molecules undergoing charge transfer
Andrzej KRZYSZTOFOWICZ,Vladimir I. TOMIN
Optica Applicata , 2006,
Abstract: The expression for time dependence of excited state dipole moment of molecule with charge transfer on the correlation function of instant spectra kinetics has been deduced on the basis of the theory of solvatochromism. Time dependence of excited state dipole moment of well known luminescence probe 6-propionyl-2-dimethylaminonaphtalene in polar solvent is presented.
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