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Katona R, Rivonkar A, Locskai R, Bátor G, Abdelouas A, Somlai J, Kovács T. Tafel-analysis of the AP-CITROX decontamination technology of Inconel alloy 690. Appl Radiat Isot 2021; 181:110073. [PMID: 34971924 DOI: 10.1016/j.apradiso.2021.110073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 12/14/2021] [Accepted: 12/17/2021] [Indexed: 11/02/2022]
Abstract
Safe, effective, cost-effective, easy feasible and low-waste decontamination technologies are fundamental importance from environmental and radiation protection aspects. In this study the effectiveness of AP-CITROX decontamination technology of Inconel alloy 690 was investigated. Non-radioactive representative metal samples were formed to test of decontamination technology and the clear-, the corroded-, the decontaminated layer were analysed electrochemically. The results indicate that the passivation step of the technology was not completed.
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Affiliation(s)
- R Katona
- University of Pannonia, Department of Radiochemistry and Radioecology, Hungary
| | - A Rivonkar
- Subatech Laboratory, IMT Atlantique, France
| | - R Locskai
- University of Pannonia, Department of Radiochemistry and Radioecology, Hungary
| | - G Bátor
- Social Organisation for Radioecological Cleanliness, Hungary
| | | | - J Somlai
- Social Organisation for Radioecological Cleanliness, Hungary
| | - T Kovács
- University of Pannonia, Department of Radiochemistry and Radioecology, Hungary; Social Organisation for Radioecological Cleanliness, Hungary.
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2
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Kovács T, Simon-Stőger L, Heller B, Varga C. Enhancing properties of PC/PA blends via compatibilization of olefin-maleic-anhydride copolymer based additives in masterbatch form. J Polym Res 2021. [DOI: 10.1007/s10965-021-02656-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AbstractPolymer blending has been a simple and efficient way for designing and controlling the performance of polymeric materials using easily available types. Both polycarbonate and polyamide have excellent mechanical properties and thermal stability but their disadvantages such as limited chemical or water resistance can be eliminate by tailoring them. Main difficulties in processing of PC/PA blends are the poor compatibility and high moisture adsorption capacity of the two raw materials complicating processing and also deteriorating mechanical properties of the products. Compatibilizing additives such as olefin-maleic-anhydride copolymer based compounds used in the experimental work can help to overcome the abovementioned difficulties. To determine the processing conditions of the raw materials several drying temperatures have been tested and thermal degradation has been examined by FT-IR spectroscopy. Experimental compatibilizing additives based on an olefin-maleic-anhydride copolymer have been investigated to enhance mechanical properties of the blends prepared by extrusion moulding. Mechanical, rheological, SEM and FT-IR measurements have been performed and at least one additive has been found to be efficient in improving selected properties.
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3
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Kocsis E, Tóth-Bodrogi E, Peka A, Adelikhah M, Kovács T. Radiological impact assessment of different building material additives. J Radioanal Nucl Chem 2021. [DOI: 10.1007/s10967-021-07897-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
AbstractIn this study, samples of building material additives were analyzed for naturally occurring radioisotope activity such as uranium, radium, and radon. The radon exhalation and the annual effective doses, were also calculated. The activities of the samples, were determined using HPGe gamma spectrometry and ionization detector. The results were used to calculate dose values by using RESRAD BUILD code. The activity concentration of the samples ranges between 9–494 Bq/kg Ra-226, 1–119 Bq/kg Th-232 and 24–730 Bq/kg K-40. In conclusion the investigated samples can be used safely as building material additives as they do not pose a major risk to humans.
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4
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de With G, Kovács T, Csordás A, Tschiersch J, Yang J, Sadler SW, Meisenberg O. Intercomparison on the measurement of the thoron exhalation rate from building materials. J Environ Radioact 2021; 228:106510. [PMID: 33341753 DOI: 10.1016/j.jenvrad.2020.106510] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Revised: 12/01/2020] [Accepted: 12/07/2020] [Indexed: 06/12/2023]
Abstract
Thoron (220Rn) exhalation from building materials has become increasingly recognized as a potential source for radiation exposure in dwellings. However, contrary to radon (222Rn), limited information on thoron exposure is available. As a result no harmonized test procedures for determining thoron exhalation from building materials are available at present. This study is a first interlaboratory comparison of different test methods to determine the thoron exhalation and a pre-step to a harmonized standard. The purpose of this study is to compare the experimental findings from a set of three building materials that are tested, and to identify future challenges in the development of a harmonized standard.
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Affiliation(s)
- G de With
- Nuclear Research and Consultancy Group (NRG), Utrechtseweg 310, NL-6800 ES, Arnhem, the Netherlands.
| | - T Kovács
- Institute of Radiochemistry and Radioecology, University of Pannonia, 8200, Veszprem, Hungary
| | - A Csordás
- Institute of Radiochemistry and Radioecology, University of Pannonia, 8200, Veszprem, Hungary
| | - J Tschiersch
- Helmholtz Zentrum München GmbH, Former Institute of Radiation Protection, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - J Yang
- Helmholtz Zentrum München GmbH, Former Institute of Radiation Protection, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany; Peking University, State Key Laboratory of Nuclear Physics and Technology, 100871, Beijing, China
| | - S W Sadler
- Durridge UK Ltd. Sheffield Technology Parks, Arundel St, Sheffield, S1 2NS, UK; Department of Physics and Astronomy, University of Sheffield, Sheffield, S3 7RH, UK
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5
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Katona R, Krójer A, Locskai R, Bátor G, Kovács T. Comparison of analytical methods for measuring chloride content in crude oil. Appl Radiat Isot 2021; 170:109594. [PMID: 33476942 DOI: 10.1016/j.apradiso.2021.109594] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Revised: 12/08/2020] [Accepted: 01/11/2021] [Indexed: 11/26/2022]
Abstract
Although chloride compounds are the main cause of corrosion damage in distillation unit, standard methods to determine them do not guarantee good results. In this study, the chloride concentration of different crude oils was measured using different techniques and the results were compared. ASTM D3230, D4929 as standard methods, XRF as alternative technique and Neutron Activation Analysis as reference method, were applied. It is concluded that XRF method is an effective technique for measuring the chloride concentration of oils.
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Affiliation(s)
- R Katona
- University of Pannonia, Institute of Radiochemistry and Radioecology, Hungary
| | - A Krójer
- University of Pannonia, Institute of Radiochemistry and Radioecology, Hungary
| | - R Locskai
- University of Pannonia, Institute of Radiochemistry and Radioecology, Hungary
| | - G Bátor
- University of Pannonia, Institute of Radiochemistry and Radioecology, Hungary; Social Organisation for Radioecological Cleanliness, Hungary
| | - T Kovács
- University of Pannonia, Institute of Radiochemistry and Radioecology, Hungary; Social Organisation for Radioecological Cleanliness, Hungary.
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6
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Abstract
Standard epidemic models based on compartmental differential equations are investigated under continuous parameter change as external forcing. We show that seasonal modulation of the contact parameter superimposed upon a monotonic decay needs a different description from that of the standard chaotic dynamics. The concept of snapshot attractors and their natural distribution has been adopted from the field of the latest climate change research. This shows the importance of the finite-time chaotic effect and ensemble interpretation while investigating the spread of a disease. By defining statistical measures over the ensemble, we can interpret the internal variability of the epidemic as the onset of complex dynamics-even for those values of contact parameters where originally regular behaviour is expected. We argue that anomalous outbreaks of the infectious class cannot die out until transient chaos is presented in the system. Nevertheless, this fact becomes apparent by using an ensemble approach rather than a single trajectory representation. These findings are applicable generally in explicitly time-dependent epidemic systems regardless of parameter values and time scales.
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Affiliation(s)
- T Kovács
- Institute for Theoretical Physics, Eötvös University, Pázmány P. s. 1A, H-1117 Budapest, Hungary
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7
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Ashaber M, Zalányi L, Pálfi E, Stuber I, Kovács T, Roe A, Friedman R, Négyessy L. Synaptic organization of cortico-cortical communication in primates. Eur J Neurosci 2020; 52:4037-4056. [PMID: 32654301 PMCID: PMC7874932 DOI: 10.1111/ejn.14905] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Revised: 07/01/2020] [Accepted: 07/01/2020] [Indexed: 01/11/2023]
Abstract
In cortical circuitry, synaptic communication across areas is based on two types of axon terminals, small and large, with modulatory and driving roles, respectively. In contrast, it is not known whether similar synaptic specializations exist for intra-areal projections. Using anterograde tracing and three-dimensional reconstruction by electron microscopy (3D-EM), we asked whether large boutons form synapses in the circuit of somatosensory cortical areas 3b and 1. In contrast to observations in macaque visual cortex, light microscopy showed both small and large boutons not only in inter-areal pathways, but also in long-distance intrinsic connections. 3D-EM showed that correlation of surface and volume provides a powerful tool for classifying cortical endings. Principal component analysis supported this observation and highlighted the significance of the size of mitochondria as a distinguishing feature of bouton type. The larger mitochondrion and higher degree of perforated postsynaptic density associated with large rather than to small boutons support the driver-like function of large boutons. In contrast to bouton size and complexity, the size of the postsynaptic density appeared invariant across the bouton types. Comparative studies in human supported that size is a major distinguishing factor of bouton type in the cerebral cortex. In conclusion, the driver-like function of the large endings could facilitate fast dissemination of tactile information within the intrinsic and inter-areal circuitry of areas 3b and 1.
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Affiliation(s)
- M. Ashaber
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - L. Zalányi
- Complex Systems and Computational Neuroscience Group, Department of Computational Sciences, Wigner Research Centre for Physics, Budapest, Hungary
| | - E. Pálfi
- Complex Systems and Computational Neuroscience Group, Department of Computational Sciences, Wigner Research Centre for Physics, Budapest, Hungary
- Department of Anatomy, Histology and Embryology, Semmelweis University, Budapest, Hungary
| | - I Stuber
- Three-dimensional morphology and motion analyses laboratory, University of Physical Education, Budapest, Hungary
| | - T. Kovács
- Nokia Hungary Ltd., Nokia Software Department, Budapest, Hungary
| | - A.W. Roe
- Division of Neuroscience, Oregon National Primate Research Center, OHSU, Beaverton OR, USA
- Department of Behavioral Neuroscience, OHSU, Portland OR, USA
- Interdisciplinary Institute of Neuroscience & Technology, Qiushi Academy for Advanced Studies, Zhejiang University, Hangzhou, China
| | - R.M. Friedman
- Division of Neuroscience, Oregon National Primate Research Center, OHSU, Beaverton OR, USA
| | - L. Négyessy
- Complex Systems and Computational Neuroscience Group, Department of Computational Sciences, Wigner Research Centre for Physics, Budapest, Hungary
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8
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Lugosi L, Kovács T. Diffusion and escape times in the open-leaky standard map. Phys Rev E 2020; 102:042202. [PMID: 33212712 DOI: 10.1103/physreve.102.042202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 09/10/2020] [Indexed: 06/11/2023]
Abstract
We study the connection between transport phenomenon and escape rate statistics in two-dimensional standard map. For the purpose of having an open phase space, we let the momentum coordinate vary freely and restrict only angle with periodic boundary condition. We also define a pair of artificial holes placed symmetrically along the momentum axis where the particles might leave the system. As a consequence of the leaks the diffusion can be analyzed making use of only the ensemble of survived particles. We present how the diffusion coefficient depends on the size and position of the escape regions. Since the accelerator modes and, thus, the diffusion are strongly related to the system's control parameter, we also investigate effects of the perturbation strength. Numerical simulations show that the short-time escape statistics do not follow the well-known exponential decay especially for large values of perturbation parameters. The analysis of the escape direction also supports this picture as a significant amount of particles skip the leaks and leave the system just after a longtime excursion in the remote zones of the phase space.
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Affiliation(s)
- L Lugosi
- Eötvös Loránd University, Institute of Physics, H-1117 Budapest, Pázmány P. s. 1/A, Hungary
| | - T Kovács
- Eötvös Loránd University, Institute of Physics, H-1117 Budapest, Pázmány P. s. 1/A, Hungary
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9
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Sári Z, Kovács T, Csonka T, Török M, Sebő É, Toth J, Tóth D, Mikó E, Kiss B, Szeőcs D, Uray K, Karányi Z, Kovács I, Méhes G, Árkosy P, Bai P. Fecal expression of Escherichia coli lysine decarboxylase (LdcC) is downregulated in E-cadherin negative lobular breast carcinoma. Physiol Int 2020; 107:349-358. [PMID: 32692716 DOI: 10.1556/2060.2020.00016] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Accepted: 05/21/2020] [Indexed: 11/19/2022]
Abstract
Breast cancer is characterized by oncobiosis, the abnormal composition of the microbiome in neoplastic diseases. The biosynthetic capacity of the oncobiotic flora in breast cancer is suppressed, as suggested by metagenomic studies. The microbiome synthesizes a set of cytostatic and antimetastatic metabolites that are downregulated in breast cancer, including cadaverine, a microbiome metabolite with cytostatic properties. We set out to assess how the protein expression of constitutive lysine decarboxylase (LdcC), a key enzyme for cadaverine production, changes in the feces of human breast cancer patients (n = 35). We found that the fecal expression of Escherichia coli LdcC is downregulated in lobular cases as compared to invasive carcinoma of no special type (NST) cases. Lobular breast carcinoma is characterized by low or absent expression of E-cadherin. Fecal E. coli LdcC protein expression is downregulated in E-cadherin negative breast cancer cases as compared to positive ones. Receiver operating characteristic (ROC) analysis of LdcC expression in lobular and NST cases revealed that fecal E. coli LdcC protein expression might have predictive values. These data suggest that the oncobiotic transformation of the microbiome indeed leads to the downregulation of the production of cytostatic and antimetastatic metabolites. In E-cadherin negative lobular carcinoma that has a higher potential for metastasis formation, the protein levels of enzymes producing antimetastatic metabolites are downregulated. This finding represents a new route that renders lobular cases permissive for metastasis formation. Furthermore, our findings underline the role of oncobiosis in regulating metastasis formation in breast cancer.
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Affiliation(s)
- Zs Sári
- 1Department of Medical Chemistry, Faculty of Medicine, University of Debrecen, Debrecen, 4032, Hungary
| | - T Kovács
- 1Department of Medical Chemistry, Faculty of Medicine, University of Debrecen, Debrecen, 4032, Hungary
| | - T Csonka
- 2Department of Pathology, Faculty of Medicine, University of Debrecen, Debrecen, 4032, Hungary
| | - M Török
- 3Department of Pathology, Kenézy Gyula County Hospital, Debrecen, 4032, Hungary
| | - É Sebő
- 4Kenézy Breast Center, Kenézy Gyula County Hospital, Debrecen, 4032, Hungary
| | - J Toth
- 5Department of Oncology, Faculty of Medicine, University of Debrecen, Debrecen, 4032, Hungary
| | - D Tóth
- 6Department of Surgery, Borsod-Abaúj-Zemplén County Hospital and University Teaching Hospital, Miskolc, 3526, Hungary
| | - E Mikó
- 1Department of Medical Chemistry, Faculty of Medicine, University of Debrecen, Debrecen, 4032, Hungary
| | - B Kiss
- 5Department of Oncology, Faculty of Medicine, University of Debrecen, Debrecen, 4032, Hungary
| | - D Szeőcs
- 1Department of Medical Chemistry, Faculty of Medicine, University of Debrecen, Debrecen, 4032, Hungary
| | - K Uray
- 1Department of Medical Chemistry, Faculty of Medicine, University of Debrecen, Debrecen, 4032, Hungary
| | - Zs Karányi
- 7Department of Internal Medicine, Faculty of Medicine, University of Debrecen, Debrecen, 4032, Hungary
| | - I Kovács
- 3Department of Pathology, Kenézy Gyula County Hospital, Debrecen, 4032, Hungary
| | - G Méhes
- 2Department of Pathology, Faculty of Medicine, University of Debrecen, Debrecen, 4032, Hungary
| | - P Árkosy
- 5Department of Oncology, Faculty of Medicine, University of Debrecen, Debrecen, 4032, Hungary
| | - P Bai
- 1Department of Medical Chemistry, Faculty of Medicine, University of Debrecen, Debrecen, 4032, Hungary.,8MTA-DE Lendület Laboratory of Cellular Metabolism, Debrecen, 4032, Hungary.,9Research Center for Molecular Medicine, Faculty of Medicine, University of Debrecen, Debrecen, 4032, Hungary
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10
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Mamyrbayeva AS, Baigazinov ZA, Lukashenko SN, Panitskiy AV, Karatayev SS, Shatrov AN, Baigazy SA, Bazarbayeva AB, Hegedűs M, Tóth-Bodrogi E, Kovács T. The transfer of 241Am and 137Cs to the tissues of broilers' organs. PLoS One 2020; 15:e0235109. [PMID: 32609724 PMCID: PMC7329069 DOI: 10.1371/journal.pone.0235109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 06/09/2020] [Indexed: 11/18/2022] Open
Abstract
Data on the transfer of artificial radionuclides from the environment to the food supply is necessary for internal dose assessment. There is a necessity for expanding and improving the available information on these factors in order to make better dose models for specific scenarios. This paper describes the results of a field experiment with broiler chickens on the transfer factor (Ff) and concentration ratio (CR) for the long-term intake of 241Am and 137Cs with grass meal and soil. The broilers were divided into two groups, each group had nine subgroups and each subgroup had three broilers. The radionuclide concentrations in the feed and the thigh muscle, thigh bone, and liver of 54 broilers divided between the grass meal and soil groups were evaluated by gamma spectrometry for 241Am and 137Cs. The duration of feeding with "contaminated" sources ranged between 1-70 days. The equilibrium stage of 241Am in muscle and bone occurs on the 1st and 40th day, respectively; for 137Cs in muscle- 30th days of intake and for liver and bone- 7th days. For 241Am, the liver did not reach equilibrium stage during the 70 days of intake. Ff of 137Cs in the "forage-muscle" and "soil-muscle" systems were determined as 1.9±0.3 and 0.18±0.05; Ff of 241Am in the "soil-muscle" system was-7.5×10-5.
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Affiliation(s)
| | - Zhanat A. Baigazinov
- Institute of Radiation Safety and Ecology NNC RK, Kurchatov, Kazakhstan
- Institute of Radiochemistry and Radioecology, University of Pannonia, Veszprém, Hungary
| | - Sergey N. Lukashenko
- Russian Institute of Radiology and Agroecology, Obninsk, Kaluga region, Russian Federation
| | | | - Seil S. Karatayev
- Institute of Radiation Safety and Ecology NNC RK, Kurchatov, Kazakhstan
| | - Anton N. Shatrov
- Institute of Radiation Safety and Ecology NNC RK, Kurchatov, Kazakhstan
| | - Symbat A. Baigazy
- Institute of Radiation Safety and Ecology NNC RK, Kurchatov, Kazakhstan
| | | | - M. Hegedűs
- Institute of Radiochemistry and Radioecology, University of Pannonia, Veszprém, Hungary
| | - E. Tóth-Bodrogi
- Institute of Radiochemistry and Radioecology, University of Pannonia, Veszprém, Hungary
| | - T. Kovács
- Institute of Radiochemistry and Radioecology, University of Pannonia, Veszprém, Hungary
- * E-mail:
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11
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Abstract
Chronic kidney diseases (CKDs) are the most common forms of kidney disease all around the world. The incidence of CKD is rising, which is mainly driven by population aging as well as by a global rise in hypertension, metabolic syndrome, and metabolic risk factors, particularly obesity and type-2 diabetes. The high mortality, morbidity of CKD, and the health care costs of the renal replacement therapy have led investigators to seek recent and potentially modifiable risk factors such as non-alcoholic fatty liver disease (NAFLD). NAFLD is the hepatic manifestation of metabolic syndrome and the most common cause of chronic liver disease. It incorporates a spectrum of liver diseases ranging from simple steatosis to steatohepatitis, liver cirrhosis, and hepatocellular carcinoma. On the basis of recent publications, the prevalence of CKD is significantly increased among patients with NAFLD, and the prevalence of NAFLD is also higher in CKD patients than in patients without NAFLD. These findings suggest that patients with NAFLD should be screened for CKD and patients with CKD and metabolic syndrome should be screened for NAFLD. Patients with NAFLD and CKD should be treated and followed up by a multidisciplinary team that involves specialists in hepatology, nephrology, diabetes, and cardiology.
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Affiliation(s)
- J Nagy
- 1 2nd Department of Internal Medicine, Nephrological and Diabetological Centre, Clinical Centre, Medical School, University of Pécs, Pécs, Hungary
| | - T Kovács
- 1 2nd Department of Internal Medicine, Nephrological and Diabetological Centre, Clinical Centre, Medical School, University of Pécs, Pécs, Hungary
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12
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Nagy J, Kovács T. A brief review on the rising incidence of chronic kidney diseases and non-alcoholic fatty liver disease. Physiol Int 2019; 106:305-310. [PMID: 31906711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Chronic kidney diseases (CKDs) are the most common forms of kidney disease all around the world. The incidence of CKD is rising, which is mainly driven by population aging as well as by a global rise in hypertension, metabolic syndrome, and metabolic risk factors, particularly obesity and type-2 diabetes. The high mortality, morbidity of CKD, and the health care costs of the renal replacement therapy have led investigators to seek recent and potentially modifiable risk factors such as non-alcoholic fatty liver disease (NAFLD). NAFLD is the hepatic manifestation of metabolic syndrome and the most common cause of chronic liver disease. It incorporates a spectrum of liver diseases ranging from simple steatosis to steatohepatitis, liver cirrhosis, and hepatocellular carcinoma. On the basis of recent publications, the prevalence of CKD is significantly increased among patients with NAFLD, and the prevalence of NAFLD is also higher in CKD patients than in patients without NAFLD. These findings suggest that patients with NAFLD should be screened for CKD and patients with CKD and metabolic syndrome should be screened for NAFLD. Patients with NAFLD and CKD should be treated and followed up by a multidisciplinary team that involves specialists in hepatology, nephrology, diabetes, and cardiology.
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Affiliation(s)
- J Nagy
- 2nd Department of Internal Medicine, Nephrological and Diabetological Centre, Clinical Centre, Medical School, University of Pécs, Pécs, Hungary
| | - T Kovács
- 2 Department of Internal Medicine, Nephrological and Diabetological Centre, Clinical Centre, Medical School, University of Pécs, Pécs, Hungary
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13
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Brennan C, Haas D, Landsberger S, Artnak E, Bátor G, Bednár A, Kovács T. A feasibility study on the determination of 90Sr food-chain transfer using stable strontium as a surrogate and neutron activation analysis. J Environ Radioact 2019; 208-209:105988. [PMID: 31176957 DOI: 10.1016/j.jenvrad.2019.105988] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2018] [Revised: 05/31/2019] [Accepted: 05/31/2019] [Indexed: 06/09/2023]
Abstract
We evaluated the applicability of neutron activation analysis for investigating the potential mobility of 90Sr in a pasture area in Hungary. To measure strontium concentrations, we made use of the 84Sr(n,γ)85Sr radiative capture reaction using neutron activation analysis and performed gamma spectroscopy using Compton-suppression techniques on the resulting 514.0 keV gamma ray. Our values for soil-to-plant transfer factors value of 1.6 (2.2) kg kg-1 were in agreement with recommended values from the ICRP and IAEA, as well as similar studies performed by independent researchers. Our values for plant-to-animal transfer coefficients and concentration ratios varied from suggested values by several orders of magnitude to agreement with other values. Based on our results the utilized transfer of stable strontium could not be regarded as a convenient substitute to help clarify the long-term transfer of radioactive strontium in the environment, because short term dosing was applied. Neutron activation analysis provides a unique niche as a technique with very little chemical processing and short sample analysis times.
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Affiliation(s)
- C Brennan
- University of Texas at Austin, Nuclear Engineering Teaching Laboratory, Pickle Research Campus, R-9000, Austin, TX, 78712, USA
| | - D Haas
- University of Texas at Austin, Nuclear Engineering Teaching Laboratory, Pickle Research Campus, R-9000, Austin, TX, 78712, USA
| | - S Landsberger
- University of Texas at Austin, Nuclear Engineering Teaching Laboratory, Pickle Research Campus, R-9000, Austin, TX, 78712, USA.
| | - E Artnak
- University of Texas at Austin, Nuclear Engineering Teaching Laboratory, Pickle Research Campus, R-9000, Austin, TX, 78712, USA
| | - G Bátor
- Institute of Radiochemistry and Radioecology, University of Pannonia, PO Box 158, 8201, Veszprém, Hungary
| | - A Bednár
- Institute of Radiochemistry and Radioecology, University of Pannonia, PO Box 158, 8201, Veszprém, Hungary
| | - T Kovács
- Institute of Radiochemistry and Radioecology, University of Pannonia, PO Box 158, 8201, Veszprém, Hungary
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14
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Akata N, Hasegawa H, Sugihara S, Tanaka M, Furukawa M, Kurita N, Kovács T, Shiroma Y, Kakiuchi H. TRITIUM, HYDROGEN AND OXYGEN ISOTOPE COMPOSITIONS IN MONTHLY PRECIPITATION SAMPLES COLLECTED AT TOKI, JAPAN. Radiat Prot Dosimetry 2019; 184:338-341. [PMID: 31329995 DOI: 10.1093/rpd/ncz062] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Indexed: 06/10/2023]
Abstract
Monthly precipitation samples have been collected at Toki, Japan, from November 2013 to March 2017. In this report, selected data were analysed to identify the regional hydrogen and oxygen isotope compositions. Tritium (3H) concentration in the precipitation ranged from 0.10 to 0.61 Bq L-1 and higher 3H concentrations were observed in spring rather than in other seasons. This range was similar to values reported in Chiba City, Japan. 3H concentration and the ratio d-excess, and δD values were roughly clustered according to each separate season. These regional hydrogen and oxygen isotope compositions will be used for environmental assessments of effects of the deuterium plasma experiments of the large fusion test device.
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Affiliation(s)
- N Akata
- National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu, Japan
| | - H Hasegawa
- Institute for Environmental Sciences, 1-7 Ienomae, Obuchi, Rokkasho, Aomori, Japan
| | - S Sugihara
- Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, Japan
| | - M Tanaka
- National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu, Japan
| | - M Furukawa
- University of Ryukyus, 1 Senbaru, Nishihara-cho, Okinawa, Japan
| | - N Kurita
- Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, Japan
| | - T Kovács
- University of Pannonia, 10 Egyetem Str, Veszprém, Hungary
| | - Y Shiroma
- Hirosaki University, 66-1 Honcho, Hirosaki, Aomori, Japan
| | - H Kakiuchi
- Institute for Environmental Sciences, 1-7 Ienomae, Obuchi, Rokkasho, Aomori, Japan
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15
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Kikaj D, Kovács T, Vaupotič J. ROLE OF METEOROLOGY AND LITHOLOGY IN THE TEMPORAL VARIATION OF THE OUTDOOR RADON LEVEL. Radiat Prot Dosimetry 2019; 184:474-478. [PMID: 31135915 DOI: 10.1093/rpd/ncz079] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 05/08/2019] [Indexed: 06/09/2023]
Abstract
The outdoor radon concentration was monitored together with the meteorological parameters at two contrasting complex topographies: sub-Alpine basin (SA) and sub-Mediterranean valley (SM) in winter (December 2017-February 2018) and summer (June-August 2018). The time series for each site and each season are evaluated in three different ways: (i) clear-sky and cloudy condition together, (ii) clear-sky conditions only (cloud cover <20%) and (iii) cloudy condition only (cloud cover >20%), and compared to the expected atmospheric boundary layer (ABL) 'mixing volume' caused by meteorological changes. The results have confirmed the sensitivity of diurnal and seasonal radon concentration to the expected ABL 'mixing volume' at the two selected sites. The relationship is more pronounced in calm clear-sky conditions. Cloudy conditions are associated with fast weather changes, when the ABL is well mixed and hourly mean radon concentrations do not follow the typical diurnal trend.
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Affiliation(s)
- D Kikaj
- Jožef Stefan International Postgraduate School, Jamova cesta 39, Ljubljana, Slovenia
- Department of Environmental Sciences, Jožef Stefan Institute, Jamova cesta 39, Ljubljana, Slovenia
| | - T Kovács
- Social Organization for Radioecological Cleanliness, Egyetem 10, Veszprém, Hungary
- Institute of Radiochemistry and Radioecology, University of Pannonia, Egyetem 10, Veszprém, Hungary
| | - J Vaupotič
- Department of Environmental Sciences, Jožef Stefan Institute, Jamova cesta 39, Ljubljana, Slovenia
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16
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Ujhelyi M, Pukancsik D, Kelemen P, Kovács E, Kenessey I, Bak M, Kásler M, Kovács T, Mátrai Z. Barriers to organized mammography screening program in Hungary: a questionnaire-based study of 3 313 women. Eur J Surg Oncol 2019. [DOI: 10.1016/j.ejso.2018.10.112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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17
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Mátrai Z, Ujhelyi M, Kovács T, Kelemen P, Sávolt Á, Kovács E, Éles K, Mészáros N, Kenessey I, Kásler M, Pukancsik D. Evaluation of the retroglandular oncoplastic technique as a standard Level I oncoplastic breast-conserving surgery. A retrospective clinico-pathological study of 102 breast cancer patients. Eur J Surg Oncol 2019. [DOI: 10.1016/j.ejso.2018.10.100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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18
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Kovács JK, Felső P, Horváth G, Schmidt J, Dorn Á, Ábrahám H, Cox A, Márk L, Emődy L, Kovács T, Schneider G. Stress Response and Virulence Potential Modulating Effect of Peppermint Essential Oil in Campylobacter jejuni. Biomed Res Int 2019; 2019:2971741. [PMID: 30719441 PMCID: PMC6335803 DOI: 10.1155/2019/2971741] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Accepted: 11/14/2018] [Indexed: 12/12/2022]
Abstract
Campylobacter jejuni is one of the most common food-borne bacteria that causes gastrointestinal symptoms. In the present study we have investigated the molecular basis of the anti-Campylobacter effect of peppermint essential oil (PEO), one of the oldest EO used to treat gastrointestinal diseases. Transcriptomic, quantitative reverse transcription-polymerase chain reaction (qRT-PCR) and proteomic, two-dimensional polyacryl amid gel electrophoresis (2D-PAGE) methods have revealed that, in the presence of a sublethal concentration of PEO, the expression of several virulence-associated genes was decreased (cheY 0.84x; flhB 0.79x; flgE 0.205x; cadF 0.08x; wlaB 0.89x; porA 0.25x; cbf2 4.3x) while impaired motility was revealed with a functional analysis. Scanning electron micrographs of the exposed cells showed that, unlike in the presence of other stresses, the originally curved C. jejuni cells straightened upon PEO exposure. Gaining insight into the molecular background of this stress response, we have revealed that in the presence of PEO C. jejuni dominantly exerts a general stress response that elevates the expression of general stress genes like dnaK, groEL, groES (10.41x, 3.63x, and 4.77x). The most important genes dps, sodB, and katA involved in oxidative stress responses showed however moderate transcriptional elevations (1,58x, 1,55x, and 1,85x).
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Affiliation(s)
- J. K. Kovács
- Department of Medical Microbiology and Immunology, University of Pécs Medical School, Hungary
| | - P. Felső
- Department of Medical Microbiology and Immunology, University of Pécs Medical School, Hungary
| | - Gy. Horváth
- Department of Pharmacognosy, University of Pécs Medical School, Hungary
| | - J. Schmidt
- Department of Biochemistry and Medical Chemistry, University of Pécs Medical School, Hungary
| | - Á. Dorn
- Department of Medical Microbiology and Immunology, University of Pécs Medical School, Hungary
| | - H. Ábrahám
- Department of Medical Biology and Central Electron Microscope Laboratory, University of Pécs Medical School, Hungary
| | - A. Cox
- Department of Biotechnology, Nanophagetherapy Center, Enviroinvest Corporation, Pécs, Hungary
| | - L. Márk
- Department of Biochemistry and Medical Chemistry, University of Pécs Medical School, Hungary
| | - L. Emődy
- Department of Medical Microbiology and Immunology, University of Pécs Medical School, Hungary
- Veterinary Medical Research Institute, Hungarian Academy of Sciences, Budapest, Hungary
| | - T. Kovács
- Department of Biotechnology, Nanophagetherapy Center, Enviroinvest Corporation, Pécs, Hungary
| | - Gy. Schneider
- Department of Medical Microbiology and Immunology, University of Pécs Medical School, Hungary
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Sági B, Késői I, Késői B, Vas T, Csiky B, Kovács T, Nagy J. Arterial stiffness may predict renal and cardiovascular prognosis in autosomal-dominant polycystic kidney disease. Physiol Int 2018; 105:145-156. [DOI: 10.1556/2060.105.2018.2.17] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Background and aims
Autosomal-dominant polycystic kidney disease (ADPKD) is one of the most common causes of end-stage renal disease (ESRD). The most important cause of death among ADPKD patients is cardiovascular (CV). The aim of this study was to examine the prognostic significance of arterial stiffness on CV and renal outcomes in ADPKD.
Methods
A total of 55 patients with ADPKD were examined. Pulse wave velocity was determined and stiffness index (SIDVP) was calculated. Combined primary endpoints (CV and renal) were major CV events (myocardial infarction, stroke, and CV intervention) as CV endpoints, and attaining of ESRD or start of renal replacement therapy as renal endpoints. Secondary endpoints were CV or renal endpoints separately.
Results
The mean age of those 55 ADPKD patients was 45 ± 12 years, 21 patients were male. The average value of the SIDVP was 11.11 ± 2.22 m/s. The patients were divided into two groups by the cutoff value of 11 m/s of SIDVP and then outcomes were analyzed. In the higher arterial stiffness group (SIDVP > 11 m/s), occurrence of combined primary endpoint (CV and renal) was significantly higher than in the group with more elastic arteries (p = 0.033). A statistically significant difference was found in the renal endpoints (p = 0.018), but not in the CV endpoints (p = 0.952) between the two groups.
Conclusions
Increased arterial stiffness predicts the onset of ESRD in ADPDK. Assessment of SIDVP appears to be a useful method for estimating the renal and CV prognosis in ADPKD.
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Affiliation(s)
- B Sági
- 1 2nd Department of Internal Medicine and Nephrological Centre, Clinical Centre, Medical School, University of Pécs, Pécs, Hungary
| | - I Késői
- 2 Internal Medicine Department, Mining Rehabilitation and Night Time Sanatorium, Health Centre of Komló, Komló, Hungary
| | - B Késői
- 3 Department of Adult Cardiology, György Gottsegen National Institute of Cardiology, Budapest, Hungary
| | - T Vas
- 1 2nd Department of Internal Medicine and Nephrological Centre, Clinical Centre, Medical School, University of Pécs, Pécs, Hungary
| | - B Csiky
- 1 2nd Department of Internal Medicine and Nephrological Centre, Clinical Centre, Medical School, University of Pécs, Pécs, Hungary
| | - T Kovács
- 1 2nd Department of Internal Medicine and Nephrological Centre, Clinical Centre, Medical School, University of Pécs, Pécs, Hungary
| | - J Nagy
- 1 2nd Department of Internal Medicine and Nephrological Centre, Clinical Centre, Medical School, University of Pécs, Pécs, Hungary
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20
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Bátor G, Bednár A, Glover TJ, Kovács T, Landsberger S. Determination of cesium transfer factors by instrumental neutron activation analysis. J Environ Radioact 2018; 187:16-21. [PMID: 29477642 DOI: 10.1016/j.jenvrad.2018.02.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 02/18/2018] [Accepted: 02/18/2018] [Indexed: 06/08/2023]
Abstract
Food-chain models are used to predict radionuclide ingestion after fallout deposition. These models include those transfer processes (soil-to-plant transfer factor(s) [TF], plant-to-animal transfer coefficient(s) [TC] and concentration ratio [CR]) that are likely to be important for radiological assessment. The range of variability for transfer factors for the same plant groups is great, about 4-5 orders of magnitude, which limits their applicability. A better way to determine the best estimate the factors for radiocaesium and other important radionuclides is if the site-specific data are available. Soil, plant and animal samples were collected from a pasture area in Hungary during the vegetation period in 2016. Stable 133Cs concentration was analysed by comparative method with neutron activation analysis (NAA). The comparator and the samples were irradiated in thermal neutron flux 2.55 × 1012 ncm-2s-1 for 2 h (soil) and 6 h (vegetation, animal samples) in the TRIGA Mark II research reactor at the Nuclear Engineering Teaching Laboratory. After an appropriate decay time (12 days) the samples were measured by gamma-spectrometry and analysed. The observed stable caesium TCpm (0.48-0.53) and CRpm (0.41-0.45) were very close to 137Cs factors in the IAEA 2009 Report of 0.49 and 0.54, respectively. This methodology is particularly suitable for the simultaneous study of natural caesium in ecosystem compartments. Consequently, the transfer of stable caesium in a pasture field may be regarded as a useful analogy in predicting the long-term changes of 137Cs affected by site-specific environmental factors.
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Affiliation(s)
- G Bátor
- Institute of Radiochemistry and Radioecology, University of Pannonia, PO Box 158, 8201, Veszprém, Hungary.
| | - A Bednár
- Institute of Radiochemistry and Radioecology, University of Pannonia, PO Box 158, 8201, Veszprém, Hungary
| | - T J Glover
- University of Texas at Austin, Nuclear Engineering Teaching Laboratory, Pickle Research Campus, R-9000, Austin, TX, 78712, USA
| | - T Kovács
- Institute of Radiochemistry and Radioecology, University of Pannonia, PO Box 158, 8201, Veszprém, Hungary
| | - S Landsberger
- University of Texas at Austin, Nuclear Engineering Teaching Laboratory, Pickle Research Campus, R-9000, Austin, TX, 78712, USA
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21
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Sági B, Késoi I, Vas T, Csiky B, Kovács T, Nagy J. THE PROGNOSTIC ROLE OF HEART RATE RECOVERY AFTER EXERCISE IN IGA NEPHROPATHY. J Hypertens 2018. [DOI: 10.1097/01.hjh.0000539517.12352.80] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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22
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Ignjatović I, Sas Z, Dragaš J, Somlai J, Kovács T. Radiological and material characterization of high volume fly ash concrete. J Environ Radioact 2017; 168:38-45. [PMID: 27400654 DOI: 10.1016/j.jenvrad.2016.06.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Revised: 05/24/2016] [Accepted: 06/25/2016] [Indexed: 06/06/2023]
Abstract
The main goal of research presented in this paper was the material and radiological characterization of high volume fly ash concrete (HVFAC) in terms of determination of natural radionuclide content and radon emanation and exhalation coefficients. All concrete samples were made with a fly ash content between 50% and 70% of the total amount of cementitious materials from one coal burning power plant in Serbia. Physical (fresh and hardened concrete density) and mechanical properties (compressive strength, splitting tensile strength and modulus of elasticity) of concrete were tested. The radionuclide content (226Ra, 232Th and 40K) and radon massic exhalation of HVFAC samples were determined using gamma spectrometry. Determination of massic exhalation rates of HVFAC and its components using radon accumulation chamber techniques combined with a radon monitor was performed. The results show a beneficial effect of pozzolanic activity since the increase in fly ash content resulted in an increase in compressive strength of HVFAC by approximately 20% for the same mass of cement used in the mixtures. On the basis of the obtained radionuclide content of concrete components the I -indices of different HVFAC samples were calculated and compared with measured values (0.27-0.32), which were significantly below the recommended 1.0 index value. The prediction was relatively close to the measured values as the ratio between the calculated and measured I-index ranged between 0.89 and 1.14. Collected results of mechanical and radiological properties and performed calculations clearly prove that all 10 designed concretes with a certain type of fly ash are suitable for structural and non-structural applications both from a material and radiological point of view.
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Affiliation(s)
- I Ignjatović
- Department of Materials and Structures, Faculty of Civil Engineering, University of Belgrade, Serbia.
| | - Z Sas
- Institute of Radiochemistry and Radioecology, University of Pannonia, P.O. Box 158, H-8201, Veszprém, Hungary
| | - J Dragaš
- Department of Materials and Structures, Faculty of Civil Engineering, University of Belgrade, Serbia
| | - J Somlai
- Institute of Radiochemistry and Radioecology, University of Pannonia, P.O. Box 158, H-8201, Veszprém, Hungary
| | - T Kovács
- Institute of Radiochemistry and Radioecology, University of Pannonia, P.O. Box 158, H-8201, Veszprém, Hungary
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23
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Oláh J, Beshkov S, Chvojka P, Ciubuc C, Coppa G, Ibrahimi H, Kovács T, Mey W, Oláh J. Revision of Drusinae subfamily (Trichoptera, Limnephilidae): divergence by paraproct and paramere: speciation in isolation by integration. Opusc Zool 2017. [DOI: 10.18348/opzool.2017.s1.3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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24
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Pukancsik D, Kelemen P, Újhelyi M, Kovács E, Udvarhelyi N, Mészáros N, Kenessey I, Kovács T, Kásler M, Mátrai Z. Objective decision making between conventional and oncoplastic breast-conserving surgery or mastectomy: An aesthetic and functional prospective cohort study. Eur J Surg Oncol 2016; 43:303-310. [PMID: 28069398 DOI: 10.1016/j.ejso.2016.11.010] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2016] [Revised: 10/12/2016] [Accepted: 11/01/2016] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND Breast-conserving surgery (BCS) is considered the standard treatment for early-stage breast cancer. However, fair to poor cosmetic outcomes following conventional BCS have been observed in as many as one-third of cases. The aim of this study was to determine the critical tumor-to-breast volume ratio for each quadrant of the breast beyond which conventional BCS would no longer offer acceptable cosmetic and functional results or satisfactory quality of life for the patient. METHODS A prospective cohort study was performed between December 2011 and December 2013 involving 350 patients younger than 70 years with early-stage unifocal (T ≤ 30 mm) breast cancer who underwent wide excision and axillary sentinel lymph node biopsy followed by whole-breast irradiation. Using validated panels and software (the Breast Cancer Treatment Outcome Scale [BCTOS], EORTC Cancer Quality of Life Questionnaire number C30-BR23, and Breast Cancer Conservative Treatment - cosmetic results [BCCT.core] software), quality of life and aesthetic and functional parameters and their changes in correlation to the percentage of breast volume excised were statistically analyzed. RESULTS The maximum percentages of breast volume that were resectable by conventional BCS without resulting in unacceptable aesthetic and functional outcomes or decreased quality of life were 18-19% in the upper-outer quadrant (p < 0.0001), 14-15% in the lower-outer quadrant (p < 0.0001), 8-9% in the upper-inner quadrant (p < 0.0001), and 9-10% in the lower-inner quadrant (p < 0.0001). CONCLUSION Aided by the calculated cut-off values for each breast quadrant, breast surgeons might render more objective decisions regarding performing conventional BCS, using oncoplastic techniques or choosing mastectomy with immediate reconstruction.
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Affiliation(s)
- D Pukancsik
- National Institute of Oncology, Department of Breast and Sarcoma Surgery, Ráth György Str. 7-9, 1122 Budapest, Hungary.
| | - P Kelemen
- National Institute of Oncology, Department of Breast and Sarcoma Surgery, Ráth György Str. 7-9, 1122 Budapest, Hungary
| | - M Újhelyi
- National Institute of Oncology, Department of Breast and Sarcoma Surgery, Ráth György Str. 7-9, 1122 Budapest, Hungary
| | - E Kovács
- National Institute of Oncology, Department of Radiological Diagnostics, Ráth György Str. 7-9, 1122 Budapest, Hungary
| | - N Udvarhelyi
- National Institute of Oncology, Department of Surgical and Molecular Pathology, Ráth György Str. 7-9, 1122 Budapest, Hungary
| | - N Mészáros
- National Institute of Oncology, Department of Radiotherapy, Ráth György Str. 7-9, 1122 Budapest, Hungary
| | - I Kenessey
- National Institute of Oncology, National Cancer Registry, Ráth György Str. 7-9, 1122 Budapest, Hungary
| | - T Kovács
- Guy's and St Thomas' Hospitals NHS Foundation Trust, Department of Breast Surgery, Great Maze Pond, London SE1 9RT, United Kingdom
| | - M Kásler
- National Institute of Oncology, Ráth György Str. 7-9, 1122 Budapest, Hungary
| | - Z Mátrai
- National Institute of Oncology, Department of Breast and Sarcoma Surgery, Ráth György Str. 7-9, 1122 Budapest, Hungary
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25
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Ujhelyi M, Pukancsik D, Kelemen P, Kovács E, Kenessey I, Udvarhelyi N, Bak M, Kovács T, Mátrai Z. 44. Does breast screening offer a survival benefit? A retrospective comparative study of oncological outcomes of screen detected and symptomatic early stage breast cancer cases. Eur J Surg Oncol 2016. [DOI: 10.1016/j.ejso.2016.06.050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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26
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Újhelyi M, Pukancsik D, Kelemen P, Kovács E, Kenessey I, Udvarhelyi N, Bak M, Kovács T, Mátrai Z. Does breast screening offer a survival benefit? A retrospective comparative study of oncological outcomes of screen-detected and symptomatic early stage breast cancer cases. Eur J Surg Oncol 2016; 42:1814-1820. [PMID: 27424787 DOI: 10.1016/j.ejso.2016.06.403] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Revised: 06/19/2016] [Accepted: 06/23/2016] [Indexed: 01/05/2023] Open
Abstract
INTRODUCTION Mammography screening reduces breast cancer mortality by up to 32%. However, some recent studies have questioned the impact of non-palpable breast cancer detection on mortality reduction. The aim of this study was to analyse the clinicopathological and long-term follow-up data of early stage screened and symptomatic breast cancer patients. PATIENTS AND METHOD The institutional prospectively led database was systematically analysed for breast cancer cases diagnosed via the mammography screening program from 2002 to 2009. As a control group, symptomatic early stage breast cancer patients were collected randomly from the same database and matched for age and follow-up period. All medical records were reviewed retrospectively. RESULTS Data from 298 breast cancer patients were collected from 47,718 mammography screenings. In addition, 331 symptomatic breast cancer patients were randomly selected. The screened group presented a significantly lower median tumour size (P < 0.00001). The incidence of negative regional lymph nodes was significantly higher in the screened group (P < 0.0006). The incidence of chemotherapy was 17% higher in the symptomatic group (P = 4*10-5). At the median follow-up of 65 and 80 months, the screened group did not exhibit better overall (P = 0.717) or disease-free survival (P = 0.081) compared to the symptomatic group. CONCLUSION Our results do not suggest that mammography screening does not reduce breast cancer mortality but the mammography screening did not bring any significant improvement in patient overall or disease-free survival for the early stage breast cancer patients compared to the symptomatic group. The drawback of symptomatic early stage tumours compared to non-palpable tumours could be equalized by modern multimodality oncology treatments.
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Affiliation(s)
- M Újhelyi
- National Institute of Oncology, Department of Breast and Sarcoma Surgery, Ráth György str. 7-9, 1122 Budapest, Hungary.
| | - D Pukancsik
- National Institute of Oncology, Department of Breast and Sarcoma Surgery, Ráth György str. 7-9, 1122 Budapest, Hungary
| | - P Kelemen
- National Institute of Oncology, Department of Breast and Sarcoma Surgery, Ráth György str. 7-9, 1122 Budapest, Hungary
| | - E Kovács
- National Institute of Oncology, Department of Radiological Diagnostics, Ráth György str. 7-9, 1122 Budapest, Hungary
| | - I Kenessey
- National Institute of Oncology, National Cancer Registry, Ráth György str. 7-9, 1122 Budapest, Hungary
| | - N Udvarhelyi
- National Institute of Oncology, Surgical and Molecular Tumor Pathology Centre, Ráth György str. 7-9, 1122 Budapest, Hungary
| | - M Bak
- National Institute of Oncology, Department of Cytopathology, Ráth György str. 7-9, 1122 Budapest, Hungary
| | - T Kovács
- Guy's Hospital, Breast Unit, Great Maze Pond, London SE1 9RT, United Kingdom
| | - Z Mátrai
- National Institute of Oncology, Department of Breast and Sarcoma Surgery, Ráth György str. 7-9, 1122 Budapest, Hungary
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27
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Shahrokhi A, Burghele BD, Fábián F, Kovács T. New study on the correlation between carbon dioxide concentration in the environment and radon monitor devices. J Environ Radioact 2015; 150:57-61. [PMID: 26281966 DOI: 10.1016/j.jenvrad.2015.07.028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Revised: 06/30/2015] [Accepted: 07/26/2015] [Indexed: 06/04/2023]
Abstract
The influence of high geogenic carbon dioxide concentrations on monitoring devices might present a significant challenge to the measurement of radon concentrations in environments with a high level of carbon dioxide concentration such as volcano sites, mofettes, caves, etc. In this study, the influence of carbon dioxide concentration on several different types of radon monitor devices - including Alpha Spectrometry (Sarad RTM 2200, EQF 3220, RAD7), Ionizing Chamber (AlphaGUARD PQ2000 PRO) and Active Cell (Active scintillation cell, Pylon 300A) - was examined to represent new aspects of radon measuring in environments with carbon dioxide. In light of the results, all measuring devices were exposed to variable conditions affected by carbon dioxide concentration, except for the AlphaGUARD, which was kept in a steady state throughout the experiment. It was observed that alpha spectroscopy devices were affected by carbon dioxide, since measured radon concentrations decreased in the presence of 70% and 90% carbon dioxide concentrations by 26.5 ± 2% and 14.5 ± 2.5% for EQF 3220, and 32 ± 2% and 35.5 ± 2% for RTM 2200. However, the ionizing chamber instrument was unaffected by changes in carbon dioxide concentration. It was determined that the RAD7 performed relatively inefficiently in the presence of carbon dioxide concentrations higher than 67% by an overall efficiency factor of approximately 0.52, confirming that it is not an admissible radon monitor instrument in environments with high carbon dioxide concentrations.
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Affiliation(s)
- A Shahrokhi
- Doctoral School of Chemistry and Environmental Sciences, Institute of Radiochemistry and Radioecology, University of Pannonia, Veszprém, Hungary.
| | - B D Burghele
- Interdisciplinary Research Institute on Bio-Nano-Sciences of Babeş-Bolyai University, Cluj-Napoca, Romania
| | - F Fábián
- Doctoral School of Chemistry and Environmental Sciences, Institute of Radiochemistry and Radioecology, University of Pannonia, Veszprém, Hungary
| | - T Kovács
- Doctoral School of Chemistry and Environmental Sciences, Institute of Radiochemistry and Radioecology, University of Pannonia, Veszprém, Hungary
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28
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Horváth D, Bátor G, Kovács T. Preliminary study of the applicability of the thin gap method on alpha emitters. Appl Radiat Isot 2015; 107:247-251. [PMID: 26562449 DOI: 10.1016/j.apradiso.2015.10.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Revised: 09/28/2015] [Accepted: 10/29/2015] [Indexed: 10/22/2022]
Abstract
The thin gap method as an in-situ radiotracer technique is widely used. This study investigated the applicability of alpha emitters. PIPS and CsI alpha spectrometers were applied in a thin gap cell. A suitable (210)Po source was prepared by spontaneous deposition, Mylar foil was used to simulate water. A maximum intensity decrement of 7% within 25 μm was observed. Even though this method is suitable for the study of surface phenomena, further investigation is necessary e.g. into water and heat sensitivity.
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Affiliation(s)
- D Horváth
- Institute of Radiochemistry and Radioecology, University of Pannonia, H-8200 Veszprém, Hungary
| | - G Bátor
- Institute of Radiochemistry and Radioecology, University of Pannonia, H-8200 Veszprém, Hungary
| | - T Kovács
- Institute of Radiochemistry and Radioecology, University of Pannonia, H-8200 Veszprém, Hungary.
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Csordás A, Fábián F, Horváth M, Hegedűs M, Somlai J, Kovács T. Preparation and characterisation of ceramic-based thoron sources for thoron calibration chamber. Radiat Prot Dosimetry 2015; 167:151-154. [PMID: 25920779 DOI: 10.1093/rpd/ncv234] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The aim of this study is to explore the correlations between the properties of the source's material and the thoron flux produced. This means a complex procedure that involves morphological characterisation (the determination of specific surface area and pore size distribution) and thoron emanation and exhalation measurements as well. In this work, the preparation of 27 thoron sources has been carried out. Three types of ceramics with different morphological properties were used as a matrix material with three different thorium contents. Spheres were formed from the dollop, and they were fired at different temperatures (200, 600 and 900°C). The phase analysis of the samples was performed by powder X-ray diffraction. The pore size distribution was determined by mercury penetration. The thoron emanation was measured using an accumulation chamber; the measured thoron emanation coefficients were from 0.34 ± 0.03 to 7.69 ± 0.13 %. Based on the results, the preparation parameters of the thoron source optimised for the calibration procedure have been given.
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Affiliation(s)
- A Csordás
- Social Organisation for Radioecological Cleanliness, Veszprém, Hungary Institute of Radiochemistry and Radioecology, University of Pannonia, Veszprém, Hungary
| | - F Fábián
- Institute of Radiochemistry and Radioecology, University of Pannonia, Veszprém, Hungary
| | - M Horváth
- Institute of Radiochemistry and Radioecology, University of Pannonia, Veszprém, Hungary
| | - M Hegedűs
- Institute of Radiochemistry and Radioecology, University of Pannonia, Veszprém, Hungary
| | - J Somlai
- Institute of Radiochemistry and Radioecology, University of Pannonia, Veszprém, Hungary
| | - T Kovács
- Institute of Radiochemistry and Radioecology, University of Pannonia, Veszprém, Hungary
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Kardos R, Sas Z, Hegedűs M, Shahrokhi A, Somlai J, Kovács T. Radionuclide content of NORM by-products originating from the coal-fired power plant in Oroszlány (Hungary). Radiat Prot Dosimetry 2015; 167:266-269. [PMID: 25944954 DOI: 10.1093/rpd/ncv259] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
At the Thermal Power Plant in Oroszlány (Hungary), a huge amount of by-products have been produced since 1961. In this survey, coal and other by-products were examined (fly ash, bottom ash, fluidised bed bottom ash, gypsum and slurry-type ash). The natural isotopes were determined using an HPGe detector. It was found that the radionuclide content of coal was significantly lower ((226)Ra = 45.3±6.3, (232)Th = 26.3±5.7 and (40)K = 210±21 Bq kg(-1)) than that in the case of ashes other than the fluidised type. The average values of the bottom ash-deposited in the largest quantities-were three times higher than those for coal ((226)Ra = 144±18, (232)Th = 84.3±14 and (40)K = 260±25 Bq kg(-1)). In the case of fractionised bottom ash, the radionuclide content of <0.1 mm was 45 % higher than that of >1.6 mm and the massic radon exhalation of <0.1 mm was approximately four times higher than that above this range.
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Affiliation(s)
- R Kardos
- Institute of Radiochemistry and Radioecology, University of Pannonia, 10 Egyetem str. H-8200, Veszprém, Hungary Social Organization of Radioecological Cleanliness, 10. Egyetem str. H-8200, Veszprém, Hungary
| | - Z Sas
- Institute of Radiochemistry and Radioecology, University of Pannonia, 10 Egyetem str. H-8200, Veszprém, Hungary
| | - M Hegedűs
- Institute of Radiochemistry and Radioecology, University of Pannonia, 10 Egyetem str. H-8200, Veszprém, Hungary
| | - A Shahrokhi
- Institute of Radiochemistry and Radioecology, University of Pannonia, 10 Egyetem str. H-8200, Veszprém, Hungary
| | - J Somlai
- Institute of Radiochemistry and Radioecology, University of Pannonia, 10 Egyetem str. H-8200, Veszprém, Hungary
| | - T Kovács
- Institute of Radiochemistry and Radioecology, University of Pannonia, 10 Egyetem str. H-8200, Veszprém, Hungary
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Szijártó IA, Molnár GA, Mikolás E, Fisi V, Cseh J, Laczy B, Kovács T, Böddi K, Takátsy A, Gollasch M, Koller A, Wittmann I. Elevated vascular level of ortho-tyrosine contributes to the impairment of insulin-induced arterial relaxation. Horm Metab Res 2014; 46:749-52. [PMID: 25208272 DOI: 10.1055/s-0034-1387701] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Previous studies have shown that in diabetes mellitus, insulin-induced relaxation of arteries is impaired and the level of ortho-tyrosine (o-Tyr), an oxidized amino acid is increased. Thus, we hypothesized that elevated vascular level of o-Tyr contributes to the impairment of insulin-induced vascular relaxation. Rats were fed with o-Tyr for 4 weeks. Insulin-induced vasomotor responses of isolated femoral artery were studied using wire myography. Vascular o-Tyr content was measured by HPLC, whereas immunoblot analyses were preformed to detect eNOS phosphorylation. Sustained oral supplementation of rats with o-Tyr increased the content of o-Tyr in the arterial wall and significantly reduced the relaxations to insulin. Sustained supplementation of cultured endothelial cells with o-Tyr increased the incorporation of o-Tyr and mitigated eNOS Ser (1 177) phosphorylation to insulin. Increasing arterial wall o-Tyr level attenuates insulin-induced relaxation - at least in part - by decreasing eNOS activation. Elevated level of o-Tyr could be an underlying mechanism for vasomotor dysfunction in diabetes mellitus.
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Affiliation(s)
- I A Szijártó
- 2nd Department of Medicine and Nephrological Center, University of Pécs, Pécs, Hungary
| | - G A Molnár
- 2nd Department of Medicine and Nephrological Center, University of Pécs, Pécs, Hungary
| | - E Mikolás
- 2nd Department of Medicine and Nephrological Center, University of Pécs, Pécs, Hungary
| | - V Fisi
- 2nd Department of Medicine and Nephrological Center, University of Pécs, Pécs, Hungary
| | - J Cseh
- 2nd Department of Medicine and Nephrological Center, University of Pécs, Pécs, Hungary
| | - B Laczy
- 2nd Department of Medicine and Nephrological Center, University of Pécs, Pécs, Hungary
| | - T Kovács
- 2nd Department of Medicine and Nephrological Center, University of Pécs, Pécs, Hungary
| | - K Böddi
- Department of Biochemistry and Medical Chemistry, University of Pécs, Pécs, Hungary
| | - A Takátsy
- Department of Biochemistry and Medical Chemistry, University of Pécs, Pécs, Hungary
| | - M Gollasch
- Experimental and Clinical Research Center (ECRC), Max Delbrück Center for Molecular Medicine, Berlin, Germany
| | - A Koller
- Department of Pathophysiology and Gerontology and Szentágothai Research Centre University of Pécs, Hungary
| | - I Wittmann
- 2nd Department of Medicine and Nephrological Center, University of Pécs, Pécs, Hungary
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Kovács I, Horváth M, Kovács T, Somogyi K, Tretter L, Geiszt M, Petheő GL. Comparison of proton channel, phagocyte oxidase, and respiratory burst levels between human eosinophil and neutrophil granulocytes. Free Radic Res 2014; 48:1190-9. [DOI: 10.3109/10715762.2014.938234] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Muűllerová M, Kozak K, Kovács T, Csordás A, Grzadziel D, Holý K, Mazur J, Moravcsík A, Neznal M, Neznal M, Smetanová I. Preliminary results of indoor radon survey in V4 countries. Radiat Prot Dosimetry 2014; 160:210-213. [PMID: 24723197 DOI: 10.1093/rpd/ncu081] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The measurements of radon activity concentration carried out in residential houses of V4 countries (Hungary, Poland and Slovakia) show that radon levels in these countries considerably exceed the world average. Therefore, the new radon data and statistical analysis are required from these four countries. Each partner chose a region in their own country, where radon concentration in residential buildings was expected to be higher. The results of the survey carried out in the period from March 2012 to May 2012 show that radon concentrations are <200 Bq m(-3) in ∼87% of cases. However, dwellings with radon concentration ∼800 Bq m(-3) were found in Poland and Slovakia. It was also found that the distribution of radon frequency follows that of houses according to the year of their construction.
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Affiliation(s)
- M Muűllerová
- Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynská dolina F-1, 841 04 Bratislava, Slovak Republic
| | - K Kozak
- Institute of Nuclear Physics PAN (IFJ PAN), Radzikowskiego 152, Krakow 31-342, Poland
| | - T Kovács
- Institute of Radiochemistry and Radioecology, University of Pannonia, Egyetem str. 10, Veszprém 8200, Hungary
| | - A Csordás
- Institute of Radiochemistry and Radioecology, University of Pannonia, Egyetem str. 10, Veszprém 8200, Hungary
| | - D Grzadziel
- Institute of Nuclear Physics PAN (IFJ PAN), Radzikowskiego 152, Krakow 31-342, Poland
| | - K Holý
- Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynská dolina F-1, 841 04 Bratislava, Slovak Republic
| | - J Mazur
- Institute of Nuclear Physics PAN (IFJ PAN), Radzikowskiego 152, Krakow 31-342, Poland
| | - A Moravcsík
- Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynská dolina F-1, 841 04 Bratislava, Slovak Republic
| | - M Neznal
- RADON v.o.s., Novakovych 6, 180 00 Praha 8, Czech Republic
| | - M Neznal
- RADON v.o.s., Novakovych 6, 180 00 Praha 8, Czech Republic
| | - I Smetanová
- Geophysical Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 28 Bratislava, Slovak Republic
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Abstract
Radon isotopes and their progenies have proven significant role in respiratory tumour formation. In most cases, the radiological effect of one of the radon isotopes (thoron) and its progenies has been neglected together with its measurement technique; however, latest surveys proved that thoron's existence is expectable in flats and in workplace in Europe. Detectors based on different track detector measurement technologies have recently spread for measuring thoron progenies; however, the calibration is not yet completely elaborated. This study deals with the calibration of the track detector measurement method suitable for measuring thoron progenies using different devices with measurement techniques capable of measuring several progenies (Pylon AB5 and WLx, Sarad EQF 3220). The calibration factor values related to the thoron progeny monitors, the measurement uncertainty, reproducibility and other parameters were found using the calibration chamber. In the future, the effects of the different parameters (aerosol distribution, etc.) will be determined.
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Affiliation(s)
- F Fábián
- Institute of Radiochemistry and Radioecology, University of Pannonia, Veszprém, Hungary
| | - A Csordás
- Institute of Radiochemistry and Radioecology, University of Pannonia, Veszprém, Hungary
| | - A Shahrokhi
- Institute of Radiochemistry and Radioecology, University of Pannonia, Veszprém, Hungary
| | - J Somlai
- Institute of Radiochemistry and Radioecology, University of Pannonia, Veszprém, Hungary
| | - T Kovács
- Institute of Radiochemistry and Radioecology, University of Pannonia, Veszprém, Hungary
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Hornyák C, Rudas G, Csillik A, Bereczki D, Kovács T. Reversible splenial lesion in a Caucasian adult. J Neurol Sci 2013. [DOI: 10.1016/j.jns.2013.07.1466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Tóth B, Marschalkó M, Kovács T, Wikonkál N, Holló P, Pónyai K, Mihalik N, Ostorházi E, Kárpáti S. P2.190 Neurosyphilis Cases in the Hungarian National STD Centre in the Last 5 Years. Br J Vener Dis 2013. [DOI: 10.1136/sextrans-2013-051184.0454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Abstract
One of the largest biomonitoring tasks is the assessing and environment monitoring of radiological wastes produced by mining. Po-210 and Pb-210 are easy to mobilise even in a weak acidic medium and as we know the biological behaviour and accumulation capacity of tobacco, this could be a suitable option for biomonitoring. During our work the Pb-210 and Po-210 concentration values of tobacco parts and soil samples originating from a Hungarian remediated uranium mine site were determined. The source preparation was spontaneous deposition following combined acidic leaching with a Po-209 tracer; the detection was carried out with a semiconductor ('PIPS') detector alpha-spectrometer. According to the results for the tobacco plant parts and soil samples, secular equilibrium could be found between the Pb-210 and Po-210 isotopes, and the isotope content of the lower leaves of the tobacco plants was in correlation with the isotope concentration of the soil; therefore, the measurement of the activity concentration is suitable for tracing smaller levels of washing out. The Po-210 activity concentration values of tobacco (average: 15.5 ± 3.6 Bq kg(-1)) and soil (average: 60.1 ± 15.2 Bq kg(-1)) samples originating from the area investigated compared with samples from another part of Hungary, Balatonalmádi (tobacco: 12.5 ± 1.0 Bq kg(-1), soil: 57.0 ± 4.7 Bq kg(-1)), do not show significant radionuclide migration.
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Affiliation(s)
- B Máté
- Institute of Radiochemistry and Radioecology, University of Pannonia, H-8200 Veszprem, Egyetem Strasse 10, Hungary
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Szeiler G, Somlai J, Ishikawa T, Omori Y, Mishra R, Sapra BK, Mayya YS, Tokonami S, Csordás A, Kovács T. Preliminary results from an indoor radon thoron survey in Hungary. Radiat Prot Dosimetry 2012; 152:243-246. [PMID: 22927648 DOI: 10.1093/rpd/ncs231] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
More than half of the radiation dose of natural origin comes from radon. However, according to some surveys in certain cases, the radiation dose originating from thoron may be considerable. Among the factors disturbing the measurement of radon, the presence of thoron may also influence the measured radon value, making the estimated radiation exposure imprecise. Thoron has previously been surveyed, mainly in Asia; however, recent surveys for some European locations have found that significant thoron concentrations also need to be considered. In this survey, several types of commercially available SSNTDs (solid-state nuclear track detectors) capable of measuring both radon and thoron were placed at the same time in 73 houses and 7 workplaces in Hungary with 3-month exposition periods. In order to measure thoron, the distance of the detector sets was fixed as 15-20 cm from the walls. The radon concentration was measured with five types of SSNTDs: NRPB, NRPB SSI, Raduet, DTPS and DRPS. The first four types had relatively good accordance (within ± 10 %), but the results of the DRPS detectors were considerably lower when compared with other detectors for radon concentrations over 100 Bq m(-3). The thoron averages were provided by two different types of detectors: Raduet and DTPS. The difference between their average results was more than 30 % and was six times the maximum values. Therefore, the thoron measurement results were judged to be erroneous, and their measurement protocol should be clearly established for future work.
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Affiliation(s)
- G Szeiler
- Institute of Radiochemistry and Radioecology, University of Pannonia, PO Box 158, H-8201 Veszprem, Hungary
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Abstract
The exhaled radon originated from building materials corresponds to the indoor radon activity concentration. One of the most commonly used building materials is the brick made from clay by heat treatment. In this study, the radon emanation and radon exhalation features of clay samples are presented as a function of heat applied (100-950°C). The free radon exhalation was determined with the help of radon accumulation kit. The initial radon exhalation value continuously reduced owing to the increased temperature. In the case of the highest temperature treated sample, the measured exhalation was <1 % of the original. The tendency of the loss relates to the internal structure modification, which was also investigated (porosity, specific surface and superficial morphology by environmental scanning electron microscope snapshots). On the basis of the obtained result, it can be safely stated that strong correlation can be observed between the internal structural changes and the found exhalation profile.
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Affiliation(s)
- Z Sas
- University of Pannonia, Institute of Radiochemistry and Radioecology, PO Box 158, Veszprém, H-8201, Hungary
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Abstract
On 4 October 2010, the gate of a red mud waste dump of a Hungarian alumina factory was damaged and ∼800.000 m(3) of alkaline red mud flooded the vicinity of the dumps. Red mud samples were collected from the contaminated area and they were investigated from the radiological point of view. The activity concentrations were as follows: (232)Th: 264 (194-337) Bq kg(-1), (238)U: 265 (197-332) Bq kg(-1), (226)Ra: 180 (143-237) Bq kg(-1), (40)K: 283 (228-360) Bq kg(-1). As a function of the moisture content (0-28 %), the obtained radon emanation coefficients were relatively high (7.6-20 %) and, consequently, the radon exhalation also increased.
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Affiliation(s)
- T Kovács
- Institute of Radiochemistry and Radioecology, University of Pannonia, PO Box 158, Veszprém H-8201, Hungary.
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Abstract
Classical nucleation theory (CNT) has been extensively employed to interpret crystal nucleation phenomena and postulates the formation of an ordered crystalline nucleus directly from vapor or solution. Here, we provide the first experimental demonstration of a two-step mechanism that facilitates deposition of crystals on solid surfaces from vapor. Crucially, this occurs from saturated vapor without the need for supersaturation, conditions that, according to CNT, cannot lead to direct deposition of crystals from vapor. Instead, the process relies on condensation of supercooled liquid in surface cavities below the melting point. Crystals then nucleate in this liquid, leading to rapid deposition of more solid. Such a mechanism has been postulated for atmospheric nucleation of ice on aerosol particles and may have analogies in the crystallization of biominerals via amorphous precursor phases.
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Affiliation(s)
- T Kovács
- †School of Physics and Astronomy and ‡School of Chemistry, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - F C Meldrum
- †School of Physics and Astronomy and ‡School of Chemistry, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - H K Christenson
- †School of Physics and Astronomy and ‡School of Chemistry, University of Leeds, Leeds LS2 9JT, United Kingdom
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Arányi Z, Kovács T, Sipos I, Bereczki D. Miller Fisher syndrome: brief overview and update with a focus on electrophysiological findings. Eur J Neurol 2011; 19:15-20, e1-3. [DOI: 10.1111/j.1468-1331.2011.03445.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Erdélyi P, Borsos É, Takács-Vellai K, Kovács T, Kovács AL, Sigmond T, Hargitai B, Pásztor L, SenGupta T, Dengg M, Pécsi I, Tóth J, Nilsen H, Vértessy BG, Vellai T. Shared developmental roles and transcriptional control of autophagy and apoptosis in Caenorhabditis elegans. Development 2011. [DOI: 10.1242/dev.068312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Érsek K, Kovács T, Wimo A, Kárpati K, Brodszky V, Péntek M, Jönsson L, Gustavsson A, McDaid D, Kenigsberg PA, Valtonen H, Gulácsi L. Costs of dementia in Hungary. J Nutr Health Aging 2010; 14:633-9. [PMID: 20922339 DOI: 10.1007/s12603-010-0309-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE The main aim of this paper is to give an overview on the quality of life, health care utilisation and costs of dementia in Hungary. METHOD A cross-sectional non-population based study of 88 consecutive dementia patients and their caregivers was conducted in three GP practices and one outpatient setting in 2008. Resource Utilization in Dementia (RUD), Mini Mental State Examination (MMSE) and quality of life (EQ-5D) were surveyed and cost calculations were performed. Costs of patients living at home were estimated by the current bottom-up cost-of-illness calculations, while costs of nursing home patients were considered by official reimbursement to determine the disease burden from a societal viewpoint. RESULTS The mean age of the patients was 77.4 years (SD=9.2), 59% of them were female. The mean MMSE score was 16.70 (SD=7.24), and the mean EQ-5D score was 0.40 (SD=0.34). The average annual cost of dementia was 6,432 Euros per patient living at home and 6,086 Euros per patient living in nursing homes. For the whole demented population (based on EuroCoDe data) we estimated total annual costs of 846.8 million Euros; of which 55% are direct costs, 9% indirect costs and 36% informal care cost. Compared to acute myocardial infarction the total disease burden of dementia is 26.3 times greater. CONCLUSIONS This is the first study investigating resource utilisation, costs, and quality of life of dementia patients in the Central and Eastern European region. Compared to the general population of Hungary EQ-5D values of the demented patients are lower in all age groups. Dementia related costs are much lower in Hungary compared to Western European countries. There is no remarkable difference between the costs of demented patients living at home and in nursing homes, from the societal point of view.
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Affiliation(s)
- K Érsek
- Corvinus University of Budapest, Health Economics and Health Technology Assessment Research Centre, Budapest, Hungary
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Varga G, Erces D, Fazekas B, Fülöp M, Kovács T, Kaszaki J, Fülöp F, Vécsei L, Boros M. N-Methyl-D-aspartate receptor antagonism decreases motility and inflammatory activation in the early phase of acute experimental colitis in the rat. Neurogastroenterol Motil 2010; 22:217-25, e68. [PMID: 19735360 DOI: 10.1111/j.1365-2982.2009.01390.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Inflammatory bowel diseases are accompanied by severe motility disorders. The aim of our study was to investigate whether the blockade of peripheral N-methyl-D-aspartate (NMDA)-sensitive glutamate receptors (NMDA-Rs) alters motility changes in chemically induced acute colitis and how this modulation is accomplished. METHODS The inflammatory and motility changes in 2,4,6-trinitrobenzenesulfonic acid (TNBS)-induced colitis were studied in anaesthetized Wistar rats following treatment with the natural NMDA-R antagonist kynurenic acid (KynA) or SZR-72, a blood-brain barrier-permeable synthetic KynA analogue. The macrohaemodynamics, serosal microcirculation (visualized by intravital videomicroscopy), plasma levels of tumour necrosis factor alpha (TNF-alpha), inflammatory enzyme activities (xanthine oxidoreductase (XOR), myeloperoxidase (MPO) and nitric oxide synthase (NOS)), and colonic motility (with a strain-gauge technique) were evaluated 17 h after colitis induction and compared with the control conditions. KEY RESULTS The TNBS enema induced a systemic hyperdynamic circulatory reaction, increased the serosal capillary blood flow, significantly elevated the mucosal XOR, MPO and NOS activities and augmented the colonic motility relative to the controls. The NMDA-R antagonist treatment with KynA or SZR-72 significantly reduced the XOR, NOS and MPO activities, decreased the motility and increased the tone of the colon. CONCLUSIONS & INFERENCES These data demonstrate a potential modulatory mechanism of NMDA-R in altered colonic motility in TNBS colitis. Inhibition of the enteric NMDA-Rs may provide a therapeutic option via which to influence intestinal hypermotility, microcirculatory changes and inflammatory activation simultaneously.
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Affiliation(s)
- G Varga
- Institute of Surgical Research, Szent-Györgyi Albert Medical and Pharmaceutical Centre, University of Szeged, Szeged, Hungary
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Gannon KL, Blitz MA, Kovács T, Pilling MJ, Seakins PW. State resolved measurements of a (1)CH(2) removal confirm predictions of the gateway model for electronic quenching. J Chem Phys 2010; 132:024302. [PMID: 20095669 DOI: 10.1063/1.3263617] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Collisional quenching of electronically excited states by inert gases is a fundamental physical process. For reactive excited species such as singlet methylene, (1)CH(2), the competition between relaxation and reaction has important implications in practical systems such as combustion. The gateway model has previously been applied to the relaxation of (1)CH(2) by inert gases [U. Bley and F. Temps, J. Chem. Phys. 98, 1058 (1993)]. In this model, gateway states with mixed singlet and triplet character allow conversion between the two electronic states. The gateway model makes very specific predictions about the relative relaxation rates of ortho and para quantum states of methylene at low temperatures; relaxation from para gateway states leads to faster deactivation independent of the nature of the collision partner. Experimental data are reported here which for the first time confirm these predictions at low temperatures for helium. However, it was found that in contrast with the model predictions, the magnitude of the effect decreases with increasing size of the collision partner. It is proposed that the attractive potential energy surface for larger colliders allows alternative gateway states to contribute to relaxation removing the dominance of the para gateway states.
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Affiliation(s)
- K L Gannon
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom
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Jobbágy V, Somlai J, Kovács J, Szeiler G, Kovács T. Dependence of radon emanation of red mud bauxite processing wastes on heat treatment. J Hazard Mater 2009; 172:1258-1263. [PMID: 19717226 DOI: 10.1016/j.jhazmat.2009.07.131] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2009] [Revised: 06/24/2009] [Accepted: 07/30/2009] [Indexed: 05/28/2023]
Abstract
Natural radioactivity content, radon emanation and some other physical characteristics of red mud were investigated, so that to identify the possibilities of the safe utilization of such material as a building material additive. Based on the radionuclide concentration, red mud is not permitted to be used directly as a building material, however, mixing of a maximum 20% red mud and 80% clay meets the requirements. The main aim of this work was to determine the dependence of the emanation factor of red mud firing temperature and some other parameters. The relevant experimental procedure was carried out in two different ways: without any additional material, and by adding a known amount of sawdust (5-35 wt%) then firing the sample at a given temperature (100-1000 degrees C). The average emanation factor of the untreated dry red mud was estimated to 20%, which decreased to about 5% at a certain heat treatment. Even lower values were found using semi-reductive atmosphere. It has been concluded that all emanation measurements results correlate well to the firing temperature, the specific surface and the pore volume.
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Affiliation(s)
- V Jobbágy
- Social Organization for Radioecological Cleanliness, Veszprém, Hungary
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Bobe R, Bredoux R, Corvazier E, Lacabaratz-Porret C, Martin V, Kovács T, Enouf J. How many Ca2+ATPase isoforms are expressed in a cell type? A growing family of membrane proteins illustrated by studies in platelets. Platelets 2009; 16:133-50. [PMID: 16011958 DOI: 10.1080/09537100400016847] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Ca(2+) signaling plays a key role in normal and abnormal platelet functions. Understanding platelet Ca(2+) signaling requires the knowledge of proteins involved in this process. Among these proteins are Ca(2+)ATPases or Ca(2+) pumps that deplete the cytosol of Ca(2+) ions. Here, we will particularly focus on two Ca(2+) pump families: the plasma membrane Ca(2+)ATPases (PMCAs) that extrude cytosolic Ca(2+) towards the extracellular medium and the sarco/endoplasmic reticulum Ca(2+)ATPases (SERCAs) that pump Ca(2+) into the endoplasmic reticulum (ER). In the present review, we will summarize data on platelet Ca(2+)ATPases including their identification and biogenesis. First of all, we will present the Ca(2+)ATPase genes and their isoforms expressed in platelets. We will especially focus on a member of the SERCA family, SERCA3, recently found to give rise to a number of species-specific isoforms. Next, we will describe the differences in Ca(2+)ATPase patterns observed in human and rat platelets. Last, we will analyze how the expression of Ca(2+)ATPase isoforms changes during megakaryocytic maturation and show that megakaryocytopoiesis is associated with a profound reorganization of the expression and/or activity of Ca(2+)ATPases. Taken together, these data provide new aspects of investigations to better understand normal and abnormal platelet Ca(2+) signaling.
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Affiliation(s)
- R Bobe
- INSERM U.689 E6, IFR139 Lariboisière, Hôpital Lariboisière, 8 Rue Guy Patin, 75475 Paris Cedex 10, France
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Szilágyi F, Acs E, Borics G, Halasi-Kovács B, Juhász P, Kiss B, Kovács T, Müller Z, Lakatos G, Padisák J, Pomogyi P, Stenger-Kovács C, Szabó KE, Szalma E, Tóthmérész B. Application of water framework directive in Hungary: development of biological classification systems. Water Sci Technol 2008; 58:2117-25. [PMID: 19092187 DOI: 10.2166/wst.2008.565] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The classification according to the Water Framework Directive (WFD) includes numerous challenges in contrast with the previously applied water qualification standards. The most important element of the ecological status, the biological one, is based on five groups of living organisms: phytoplankton, phytobenthon, macrophytes, macro-invertebrates and fish. The results of a three-year research project financed by the Ministry of Environment and Water (MoEW) and the Hungarian Academy of Sciences (HAS) are reported in this work. The objective of the project was the elaboration of a proposal for biological classification according to the WFD for the related groups of living organisms. In the course of the project the biological characteristics to be measured were selected for each of the above listed groups which served as the basic data for Biological Quality Elements (BQEs). In the BQEs we estimated the type-specific reference values for most of the Hungarian surface water types. Then we created the structure of the qualification system for these groups, including specification of class boundaries between the five classes for the Environmental Quality Ratio (EQR) values on the basis of expert estimation. A Non-Taxonomic Periphyton Index (NTPI, not included in the WFD) was also developed and tested for qualification. The elaborated classification systems were tested on the basis of existing scarce data for numerous Hungarian water types.
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Affiliation(s)
- F Szilágyi
- Department of Sanitary and Environmental Engineering, Budapest University of Technology and Economics, Muegyetem rkp. 3, H-1111, Budapest, Hungary.
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