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Rongy L, Schuszter G, Sinkó Z, Tóth T, Horváth D, Tóth A, De Wit A. Influence of thermal effects on buoyancy-driven convection around autocatalytic chemical fronts propagating horizontally. CHAOS (WOODBURY, N.Y.) 2009; 19:023110. [PMID: 19566245 DOI: 10.1063/1.3122863] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The spatiotemporal dynamics of vertical autocatalytic fronts traveling horizontally in thin solution layers closed to the air can be influenced by buoyancy-driven convection induced by density gradients across the front. We perform here a combined experimental and theoretical study of the competition between solutal and thermal effects on such convection. Experimentally, we focus on the antagonistic chlorite-tetrathionate reaction for which solutal and thermal contributions to the density jump across the front have opposite signs. We show that in isothermal conditions the heavier products sink below the lighter reactants, providing an asymptotic constant finger shape deformation of the front by convection. When thermal effects are present, the hotter products, on the contrary, climb above the reactants for strongly exothermic conditions. These various observations as well as the influence of the relative weight of the solutal and thermal effects and of the thickness of the solution layer on the dynamics are discussed in terms of a two-dimensional reaction-diffusion-convection model parametrized by a solutal R(C) and a thermal R(T) Rayleigh number.
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Farkas AS, Acsai K, Nagy N, Tóth A, Fülöp F, Seprényi G, Birinyi P, Nánási PP, Forster T, Csanády M, Papp JG, Varró A, Farkas A. Na+
/Ca2+
exchanger inhibition exerts a positive inotropic effect in the rat heart, but fails to influence the contractility of the rabbit heart. Br J Pharmacol 2009. [DOI: 10.1038/bjp.2008.128] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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53
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Toldy A, Szabó A, Novák C, Madarász J, Tóth A, Marosi G. Intrinsically flame retardant epoxy resin – Fire performance and background – Part II. Polym Degrad Stab 2008. [DOI: 10.1016/j.polymdegradstab.2008.02.011] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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54
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Conceição T, Aires-de-Sousa M, Füzi M, Tóth A, Pászti J, Ungvári E, van Leeuwen WB, van Belkum A, Grundmann H, de Lencastre H. Replacement of methicillin-resistant Staphylococcus aureus clones in Hungary over time: a 10-year surveillance study. Clin Microbiol Infect 2007; 13:971-9. [PMID: 17697003 DOI: 10.1111/j.1469-0691.2007.01794.x] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The prevalence of methicillin-resistant Staphylococcus aureus (MRSA) in Hungary has been increasing and is now close to 20% among invasive isolates of S. aureus. In order to understand the evolution of MRSA in Hungary, two collections of isolates were studied: 22 representatives of a collection of 238 MRSA isolates recovered between 1994 and 1998, and a collection of 299 MRSA isolates recovered between 2001 and 2004. The isolates were first characterised by pulsed-field gel electrophoresis (PFGE) and were distributed into 19 different PFGE patterns. Representatives of each pattern were further characterised by spa typing, multilocus sequence typing (MLST) and staphylococcal cassette chromosome mec (SCCmec) typing. The Hungarian clone that was predominant in 1994-1998 (PFGE E, ST239-III) had almost disappeared in 2003-2004, being replaced by the Southern German clone (PFGE B, ST228-I) and the New York/Japan epidemic clone (PFGE A, ST5-II), which represented c. 85% of the 2001-2004 isolates. Thus, this study describes, for the first time, the co-dominance and extensive spread of the New York/Japan clone in a European country.
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55
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Glatz K, Tóth A, Pászti J. Emergence of SHV-2a producing enterobacter cloacae in hungary. Acta Microbiol Immunol Hung 2007; 54:151-8. [PMID: 17899794 DOI: 10.1556/amicr.54.2007.2.5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
We report an investigation on a collection of multidrug-resistant Enterobacter cloacae isolates from a Hungarian neonatal intensive care unit. All the isolates (n=142) were examined by antimicrobial susceptibility testing and ERIC-PCR. The seven ESBL positive isolates (derived from six patients) made up a separated group with regard to their patterns by antimicrobial susceptibility testing and ERIC-PCR and were further tested by class-1-integron PCR and plasmid electrophoresis. The ESBL isolates were found indistinguishable in each of these laboratory tests, one genetic clone were revealed in the background of ESBL cases by PFGE. The ESBL positive isolates were proven to harbour a approximately 62 Md plasmid and two class-1 integrons (0.9 kb, 1.875 kb). With respect to their clinical relatedness and our laboratory findings there was a small outbreak caused by the ESBL clone. PCR-sequencing were performed on the outbreak strain and has revealed a blaSHV gene that encodes for an SHV-2a type ESBL enzyme. This is the first description of SHV-2a positive E. cloacae strains isolated in Hungary.
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56
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Hartyánszky I, Tóth A, Veres G, Bodor E, Merkely B, Acsády G, Szabolcs Z. New surgical technique for left ventricle volume restoration- Computer assisted left ventricle engineering. Thorac Cardiovasc Surg 2007. [DOI: 10.1055/s-2007-967435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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57
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Pajor L, Kajtár B, Jáksó P, Lacza A, László R, Radványi G, Mórocz I, Tóth A, Varga G. Epstein-Barr virus-induced B-cell proliferation of Hodgkin's and Reed-Sternberg cell pheno- and genotype may develop in peripheral T-cell lymphomas. Histopathology 2006; 49:553-7. [PMID: 17064310 DOI: 10.1111/j.1365-2559.2006.02490.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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58
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Horváth D, Tóth S, Tóth A. Periodic heterogeneity-driven resonance amplification in density fingering. PHYSICAL REVIEW LETTERS 2006; 97:194501. [PMID: 17155636 DOI: 10.1103/physrevlett.97.194501] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2006] [Indexed: 05/12/2023]
Abstract
Periodic heterogeneity is introduced in experiments with thin solution layers where downward propagating planar autocatalytic fronts are hydrodynamically unstable and cellular patterns develop. The evolution of fingers is greatly affected by the spatial heterogeneity when the wave number associated with it falls in the vicinity of the most unstable mode of the reference system with uniform thickness. The imposed heterogeneity will drive the instability by amplifying the modes with the matching wave numbers as indicated by the experimentally constructed dispersion curves.
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59
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Damjanova I, Tóth A, Pászti J, Bauernfeind A, Füzi M. Nationwide spread of clonally related CTX-M-15-producing multidrug-resistant Klebsiella pneumoniae strains in Hungary. Eur J Clin Microbiol Infect Dis 2006; 25:275-8. [PMID: 16565826 DOI: 10.1007/s10096-006-0120-4] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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60
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Ujvári T, Tóth A, Mohai M, Bertóti I. Nanomechanical property analysis of fast atom beam (FAB) treated ultrahigh molecular weight polyethylene. SURF INTERFACE ANAL 2006. [DOI: 10.1002/sia.2232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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61
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Tóth A, Mohai M, Ujvári T, Bertóti I. Hydrogen plasma immersion ion implantation of ultra-high molecular weight polyethylene. SURF INTERFACE ANAL 2006. [DOI: 10.1002/sia.2197] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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62
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Tóth A, Mohai M, Ujvári T, Bertóti I. Advanced surface modification of ultra-high molecular weight poly(ethylene) by helium plasma immersion ion implantation. POLYM ADVAN TECHNOL 2006. [DOI: 10.1002/pat.788] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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63
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Tóth A, Gacs M, Márialigeti K, Cech G, Füzi M. Occurrence and regional distribution of SHV-type extended-spectrum beta-lactamases in Hungary. Eur J Clin Microbiol Infect Dis 2005; 24:284-7. [PMID: 15902537 DOI: 10.1007/s10096-005-1315-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In order to determine the presence and geographical distribution of SHV-type extended-spectrum beta-lactamase genes among Enterobacteriaceae strains in Hungary, isolates from 25 microbiology laboratories throughout the country were collected between January 2002 and August 2003 and examined. Sequencing of the genes showed that SHV-5 and SHV-2a are the dominant SHV-types in extended-spectrum beta-lactamase-producing Enterobacteriaceae strains in this country. The SHV-2 gene, which is prevalent in many European countries, was not detected, but one isolate carried the SHV-12 gene. The results show that these genes are circulating among Enterobacteriaceae strains in Hungary and indicate that strict infection control measures are warranted in order to prevent their spread.
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Abstract
The aim of this study is to analyze the fatalities due to suicide in the period of 1991-2000. The autopsy reports of 719 suicide cases during that period of the Department of Forensic Medicine, University of Szeged were reviewed retrospectively. The victim's age, sex, way of commitment, place of death, the presence of alcohol and drug influence and survival time were recorded. Five hundred and one of the (69.6%) total 719 suicide fatalities were men and 218 (30.4%) were women. The largest age groups were 41-50 in men, in women we experienced a 'double-peak' of age groups 41-50 and 71-80. The most frequent way of committal was hanging (46%). The results revealed that 38.8% of the 474 victims whose blood and/or urine alcohol concentration measurement were carried out consumed alcohol prior to the act. The presence of licit drugs in 12% of not drug-related cases were experienced.
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Keszei S, Matkó S, Bertalan G, Anna P, Marosi G, Tóth A. Progress in interface modifications: from compatibilization to adaptive and smart interphases. Eur Polym J 2005. [DOI: 10.1016/j.eurpolymj.2004.10.039] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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66
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Volgyes B, Mezei M, Szücs R, Tóth A. Pulmonary embolism originated from right heart chamber thrombus: the diagnostic role of transesophageal echocardiography. Crit Care 2005. [PMCID: PMC4098477 DOI: 10.1186/cc3390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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67
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Tóth A, Ujvári T, Bertóti I, Szilágyi E, Keszthelyi T, Juhász A. Fast atom beam treatment of ultra-high molecular weight polyethylene. SURF INTERFACE ANAL 2004. [DOI: 10.1002/sia.1832] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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68
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Mohai M, Tóth A, Sajó I, Ujvári T, Bertóti I. Plasma surface modification of Ti and TiAlV alloy. SURF INTERFACE ANAL 2004. [DOI: 10.1002/sia.1864] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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69
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Ujvári T, Tóth A, Kovács GJ, Sáfrán G, Geszti O, Radnóczi G, Bertóti I. Composition, structure and mechanical property analysis of DC sputtered CNi and CNxNi nano-composite layers. SURF INTERFACE ANAL 2004. [DOI: 10.1002/sia.1758] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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70
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Almeras X, Renaut N, Jama C, Le Bras M, Tóth A, Bourbigot S, Marosi G, Poutch F. Structure and morphology of an intumescent polypropylene blend. J Appl Polym Sci 2004. [DOI: 10.1002/app.20470] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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71
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Bánsági T, Horváth D, Tóth A, Yang J, Kalliadasis S, De Wit A. Density fingering of an exothermic autocatalytic reaction. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2003; 68:055301. [PMID: 14682835 DOI: 10.1103/physreve.68.055301] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2002] [Revised: 09/10/2003] [Indexed: 05/24/2023]
Abstract
Density fingering of exothermic autocatalytic fronts in vertically oriented porous media and Hele-Shaw cells is studied theoretically for chemical reactions where the solutal and thermal contribution to density changes have opposite signs. The competition between these two effects leads to thermal plumes for ascending fronts. The descending fronts behave strikingly differently as they can feature, for some values of the parameters, fingers of constant amplitude and wavelength. The differences between up and down going fronts are discussed in terms of dispersion curves and nonlinear dynamics. The theoretically predicted dispersion curves are experimentally evidenced with the chlorite-tetrathionate reaction.
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72
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Langer RM, Járay J, Tóth A, Hídvégi M, Végsö G, Perner F. De novo tumors after kidney transplantation: the Budapest experience. Transplant Proc 2003; 35:1396-8. [PMID: 12826170 DOI: 10.1016/s0041-1345(03)00472-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
In a retrospective study we analyzed the incidence and characteristics of de novo tumors developing in renal transplant recipients treated in our center. The 5% incidence de novo tumors developing among patients treated with azathioprine and prednisolone (n = 241) was similar to the 5.4% incidence of de novo tumors developing among patients treated with calcineurin-based immunosuppression (n = 1918). The most common malignancies among our patients were basal cell (21.7%) and squamous cell (13.9%) carcinomas of the skin, followed by urogenital (10.4%) and lung malformations (9.6%). A high incidence of Kaposi's sarcoma (9.6%; half cutaneous and half visceral) and a lower than expected incidence of posttransplant lymphoproliferative disorder (PTLD; 3.5%) was found. Among patients developing de novo tumors, the incidence of death with a functioning graft was higher than among recipients without tumors. Moreover, the incidence of tumor-related death was high among the de novo tumor recipients. Among our recipients, the most aggressive tumors were Kaposi's sarcoma, lung tumors, lymphomas, and gastrointestinal tumors, which occurred relatively early after transplantation and were the cause of death in most cases. Compared to tumor registry data, we found an inverse basal-to-squamous cell carcinoma ratio, a lower incidence of PTLD, and a higher incidence of Kaposi's sarcoma.
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73
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Marosi G, Anna P, Márton A, Bertalan G, Bóta A, Tóth A, Mohai M, Rácz I. Flame-retarded polyolefin systems of controlled interphase. POLYM ADVAN TECHNOL 2003. [DOI: 10.1002/pat.284] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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74
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Kisely M, Emri M, Lengyel Z, Kálvin B, Horváth G, Trón L, Mikó L, Sziklai I, Tóth A. Changes in brain activation caused by caloric stimulation in the case of cochleovestibular denervation--PET study. Nucl Med Commun 2002; 23:967-73. [PMID: 12352595 DOI: 10.1097/00006231-200210000-00006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
There are a number of well-known stimulation methods for the investigation of the central projection of the vestibular system. In addition to optokinetic, galvanic and neck vibration tests, the most widespread method is caloric stimulation. These listed methods cause not only vestibular, but also other effects on the central nervous system (CNS) (acoustic, tactile and nociceptive). In this paper, positron emission tomography (PET) was used to investigate whether caloric stimulation contains a non-vestibular (extravestibular) component, which would cause a distortion in the cortical activity and therefore in the vestibular effect on the CNS. Caloric stimulation was carried out in six patients who had been operated on due to cerebello-pontine angle tumour. These patients suffered post-operatively from a complete lesion of the vestibular system and anacusis on the operated side. Ipsilaterally activated areas were the inferior pole of the post-central gyrus and temporoparietal junction, caudal part of the post-central gyrus (SI, SII), inferior parietal lobule and medial frontal gyrus. Contralaterally activated areas were the anterior cingulate gyrus, medial frontal gyrus, posterior part of the insula, post-central gyrus and temporoparietal junction (SII). Ipsilaterally deactivated areas were the caudal and cranial part of the medial occipital gyrus (V2, V3, V4, V5). Contralaterally deactivated areas were the lingual gyrus, inferior occipital gyrus (V2, V3) and fusiform gyrus. On the basis of these data, it was postulated that, during caloric stimulation, extravestibular reaction also occurs, which corresponds to the subjective feeling of heat and pain. The deactivation of the occipital cortex due to an extravestibular effect was demonstrated. This is the first observation to suggest the possibility of nociceptivevisual interaction.
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75
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Mohai M, Kiss É, Tóth A, Szalma J, Bertóti I. Preparation and characterization of Langmuir-Blodgett-type arachidate films. SURF INTERFACE ANAL 2002. [DOI: 10.1002/sia.1408] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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