1,355 results on '"Csorba A"'
Search Results
2. Corticosteroid-sparing topical treatment with cyclosporin for juvenile keratoconjunctivitis
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Amarilla Barcsay-Veres, Anita Csorba, Illes Kovacs, Laszlo Tothfalusi, and Otto Alexander Maneschg
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Vernal keratoconjunctivitis ,Blepharokeratoconjunctivitis ,Cyclosporin ,Corneal fluorescein staining ,Steroid-sparing ,Medicine ,Science - Abstract
Abstract Ocular surface inflammation due to allergy and blepharitis can lead to corneal complications and visual impairment. The aim of this study is to evaluate the efficacy of a cyclosporin 0.1% topical treatment achieving steroid-sparing. Eighty pediatric patients with moderate and severe vernal and blepharitis-related keratoconjunctivitis were included. Symptoms (photosensitivity, itching, discharge, tearing), signs (corneal fluorescein staining, papillary hypertrophy) and patients’ subjective assessment were evaluated during a 6-month follow-up. At the follow-up, all patients treated with topical cyclosporin showed a significant improvement in all subjective symptoms and objective signs (p
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- 2025
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3. The grey zone of taxonomy—The case of the Sikkim Myotis (Chiroptera: Vespertilionidae: Myotis sicarius), first recorded from Southeast Asia
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Dorottya Győrössy, Vuong Tan Tu, Gábor Csorba, Sanjan Thapa, Péter Estók, Gábor Földvári, and Tamás Görföl
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Zoology ,QL1-991 - Abstract
Abstract In taxonomic works, the weight to be given to morphological, mitochondrial, or nuclear signals, and the assessment of differences as species or subspecies distinctions has also varied considerably over the past decades and is largely a subjective research decision. This apparent example of the “grey zone of taxonomy” underpins the need of critical studies of as many specimens as possible and of using both mitochondrial and nuclear genes in taxonomic-systematic studies, as phylogeny based on uniparentally inherited genes alone may not represent true evolutionary scenarios. Myotis sicarius, a species occurring thorough the Himalayan foothills was found for the first time out of South Asia, in North Vietnam. Analysis of topotypical and Vietnamese specimens revealed high mitochondrial heterogeneity – at the upper limit of the usual threshold of intraspecific difference – but only minute nuclear sequence and negligible morphological differences. Albeit the large geographic distance between the two records might suggest the existence of two putative reproductively isolated taxonomic units, based on the incongruent results we concluded that the split of geographic populations of M. sicarius into different taxa is unsupported. As a morphologically closely resembling species, we also reviewed the taxonomic status of the two morphological forms of M. annectans and synonymizing M. primula with M. annectans was also corroborated by our phylogenetic analyses.
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- 2024
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4. The calls of Vietnamese bats: a major step toward the acoustic characterization of Asian bats
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Győrössy, Dorottya, Csorba, Gábor, Szabadi, Kriszta Lilla, Estók, Péter, Tu, Vuong Tan, Thong, Vu Dinh, Furey, Neil M., Huang, Joe Chun-Chia, Tuanmu, Mao-Ning, Fukui, Dai, Zsebők, Sándor, and Görföl, Tamás
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- 2024
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5. Internal dynamics of patent reference networks using the Bray–Curtis dissimilarity measure
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Baranyi, József, Csorba, Szilveszter, Farkas, Zsuzsa, Pacza, Tünde, and Józwiak, Ákos
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- 2024
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6. Isolated abdominal wall metastasis 42 years after curative surgery for ovarian cancer: A case report
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Roland Csorba, Paul Buderath, Marc Ingenwerth, Sa'ed Almasarweh, and Zeynep Atas Elfrink
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Ovarian cancer ,Abdominal wall metastasis ,Late recurrence ,Long-term follow-up ,Surgery ,RD1-811 ,Gynecology and obstetrics ,RG1-991 - Abstract
Despite the rarity of abdominal or chest wall metastases in ovarian cancer patients, reports have described instances of isolated late recurrence at surgical incision sites. We report the case of an 85-year-old woman who present with a massive metastatic tumor on the right anterior abdominal wall 42 years after undergoing a total abdominal hysterectomy and bilateral salpingo-oophorectomy for primary ovarian cancer. The abdominal wall tumor was resected en bloc, and abdominal wall reconstruction was performed using a mesh. Histology revealed a low-grade serous carcinoma.This report highlights the possibility of abdominal wall metastases after prolonged survival following the treatment of ovarian cancer. Surgical excision combined with mesh reconstruction represents an adequate treatment approach for such cases. Caution should be exercised during laparotomy to ensure complete removal of malignant tissue and to prevent parietal dissemination. Long-term follow-up is crucial for ovarian cancer patients, as late recurrences, although rare, can occur even decades after initial treatment.
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- 2025
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7. Harnessing cyclodextrins for enhanced ocular delivery of carotenoid derivatives: From development to ex vivo characterization
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Réka Angi, Attila János Kalóczkai, Anna Kovács, András Marton, Vivien Bárdos, Péter Dormán, Gábor Katona, Attila Agócs, Anita Csorba, Zoltán Zs. Nagy, Anna Vincze, and György T. Balogh
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Lutein ,Zeaxanthin ,Cyclodextrins ,Solubility ,Corneal permeability ,Ex vivo ,Biochemistry ,QD415-436 - Abstract
Lutein and zeaxanthin, prominent carotenoids with antioxidant properties, contribute notably to maintaining of ocular health. These substances reduce the harmful effect of oxidative stress and blue light and ensure the vision quality. Carotenoids-rich dietary could have ophthalmic benefits, such as enhanced contrast perception and reduced eye fatigue, while also show potential in mitigating the risk of age-related macular degeneration (AMD). Nonetheless, ocular administration of carotenoids could enhance the local ophthalmic bioavailability of these compounds. The aim of this study was to investigate ophthalmic applicability of lutein (LutD) and zeaxanthin disuccinates (ZeaD) in aqueous solutions applying cyclodextrins to improve their solubility and permeability. Among the tested cyclodextrins, randomly methylated beta-cyclodextrin (RAMEB) was identified as the most effective solubilizing agent, achieving solubility values of 572±55 μM and 1470±103 μM for LutD and ZeaD, respectively. In vitro corneal-PAMPA and ex vivo porcine eye models demonstrated that RAMEB-based formulations significantly improved the permeability of both carotenoid derivatives by increasing their solubility (corneal concentration at 15 mins), markedly surpassing those of the reference suspensions. The findings suggest that RAMEB may be essential for developing carotenoid-based aqueous eye drops, leveraging its antioxidant properties to improve ocular health and ameliorate various degenerative eye conditions.
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- 2025
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8. Comparing Spectroscopy Measurements in the Prediction of in Vitro Dissolution Profile using Artificial Neural Networks
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Mrad, Mohamed Azouz, Csorba, Kristóf, Galata, Dorián László, Nagy, Zsombor Kristóf, and Nagy, Brigitta
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Computer Science - Machine Learning ,Physics - Instrumentation and Detectors - Abstract
Dissolution testing is part of the target product quality that is essential in approving new products in the pharmaceutical industry. The prediction of the dissolution profile based on spectroscopic data is an alternative to the current destructive and time-consuming method. Raman and near-infrared (NIR) spectroscopies are two fast and complementary methods that provide information on the tablets' physical and chemical properties and can help predict their dissolution profiles. This work aims to compare the information collected by these spectroscopy methods to support the decision of which measurements should be used so that the accuracy requirement of the industry is met. Artificial neural network models were created, in which the spectroscopy data and the measured compression curves were used as an input individually and in different combinations in order to estimate the dissolution profiles. Results showed that using only the NIR transmission method along with the compression force data or the Raman and NIR reflection methods, the dissolution profile was estimated within the acceptance limits of the f2 similarity factor. Adding further spectroscopy measurements increased the prediction accuracy., Comment: 11 pagee, 5 figures, 3rd International Conference on Data Science and Machine Learning (DSML 2022)
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- 2022
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9. Facile Determination of Aluminum Content in Industrial Brine by Investigating the Effects of Buffer Systems
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Benjámin Csorba, László Farkas, Marcell Csécsi, Prof. Dr. László T. Mika, and Dr. Iván L. Gresits
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Aluminum ,Eriochrome cyanine R ,Good's buffers ,Industrial analytics ,UV/Vis spectroscopy ,Chemistry ,QD1-999 - Abstract
Abstract The aluminum content of concentrated (27 wt%) sodium chloride solutions could be crucial for large‐scale chlor‐alkali‐based industries applying membrane cell electrolysis. Thus, a facile method which enables a fast and reliable protocol to determine the Al content of these solutions on ppb scale in industrial environments is fundamentally important. It was demonstrated that the increased sensitivity of colorful Al‐ECR (eriochrome cyanine R) complex by the use of a cationic surfactant and specific biological buffers could effectively indicate the Al content in an extended pH interval of a concentrated saline medium under industrial conditions. The dependence of the analytical protocol on pH, temperature, time, wavelength, and the salinity of the medium was investigated. It was shown that the absorbance‐based measurements of the solution should be performed at least 2–4 h after its preparation. By applying the selected two Good's buffers (HEPES: 4‐(2‐hydroxyethyl)‐1‐piperazineethanesulfonic acid, MOPS: 3‐(N‐morpholino)‐propanesulfonic acid) and Tris (tris(hydroxymethyl)aminomethane), 32.8–38.1 % increase in the sensitivity was achieved for saturated NaCl solutions. Moreover, the limits of detection and quantification (LOD, LOQ) were also lowered by 19.0–29.8 %, and the salinity dependence of the calibration was also reduced.
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- 2024
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10. Extracorporeal life support without systemic anticoagulation: a nitric oxide-based non-thrombogenic circuit for the artificial placenta in an ovine model
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Fallon, Brian P., Lautner-Csorba, Orsolya, Major, Terry C., Lautner, Gergely, Harvey, Stephen L., Langley, Mark W., Johnson, Matthew D., Saveski, Claudia, Matusko, Niki, Rabah, Raja, Rojas-Pena, Alvaro, Meyerhoff, Mark E., Bartlett, Robert H., and Mychaliska, George B.
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- 2024
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11. The impact of the COVID-19 pandemic on students’ future online education behaviour
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Csorba, Luiela Magdalena and Dabija, Dan-Cristian
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- 2024
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12. Canada has brain-drain, but residents abroad often find it hard to come home
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Csorba, Emerson
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Brain drain -- Political aspects -- Economic aspects - Abstract
Byline: EMERSON CSORBA Business executive, previously working in geopolitics Following nearly a decade in Britain, I have come to appreciate the importance of making a contribution to Canada at an [...]
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- 2025
13. The Effects of Cutting Parameters on Cutting Force and Tribological Properties of Machined Surface Under Dry Turning of AISI304L Austenitic Stainless Steel
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Gábor Kónya, Béla Csorba, Norbert Szabó, and Zsolt F. Kovács
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turning ,stainless steel ,cutting force ,Ra ,Rz ,Rsk-Rku tribological map ,Production capacity. Manufacturing capacity ,T58.7-58.8 - Abstract
In this study, the effects of cutting speed and feed rate on the roughness parameters Ra, Rz, Rsk, Rku, Rpk, Rvk, and A2 were examined during machining with coated carbide tools in a dry environment. The authors introduced the Rvk/Rpk ratio, a coefficient that facilitates a simpler evaluation of surface wear resistance. Specifically, if this ratio is greater than 1, the surface is more wear-resistant, while values less than 1 indicate a higher tendency for surface wear. The Taguchi OA method was used to analyze and identify the significance of technological parameters on output characteristics. Based on the results, it was established that feed rate has the greatest impact on all output characteristics. The highest cutting force was measured at a cutting speed of 60 m/min and a feed rate of 0.15 mm/rev, attributed to the fact that at lower cutting speeds, the base material does not soften while the cross-sectional area of the chip increases. To achieve the lowest Ra and Rz surface roughness, a cutting speed of 100 m/min and a feed rate of 0.05 mm/rev are recommended. If the goal is to enhance surface wear resistance and improve oil retention capability, machining with a cutting speed of 80–100 m/min and a feed rate of 0.15 mm/rev is advisable, as the coarser machining increases both the Rvk/Rpk ratio and the oil-retaining pocket size, which together improve the wear resistance of the machined surface.
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- 2024
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14. Determinants of soil and water conservation practices adoption by smallholder farmers in the central highlands of Kenya
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Rotich, Brian, Maket, Isaiah, Kipkulei, Harison, Ocansey, Caleb Melenya, Justine, Phenson Nsima, MohammedZein, Mohammed Ahmed, Csorba, Ádám, and Michéli, Erika
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- 2024
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15. Rendszergondolatok rendszerezése. Interjú a 80 éves Kerényi Attila professzorral [Interjú]
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Fazekas, István, Balla, Dániel, Benkhard, Borbála, Csorba, Péter, Kiss, Emőke, Mester, Tamás, Szabó, György, and Vasvári, Mária
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soil erosion ,landscape protection ,environmental protection ,global environment ,sustainable development ,environmental systems ,Geography. Anthropology. Recreation - Abstract
Attila Kerényi, Professor of Geography, was born in 1943 in Sátoraljaújhely. He earned a degree as a teacher of Geography and Biology in 1967. During the 1980s, he gained national and international scientific recognition for his research on soil erosion processes, and completed his candidate dissertation in 1984. In the 1990s, he became nationally acknowledged for his publications, textbooks and scientific books on landscape and environmental protection, and earned an academic doctorate title in the topic. His scientific work was recognized with numerous awards. In 2020, he was awarded the Officer’s Cross of the Hungarian Order of Merit in recognition of his several decades of research and teaching activities which have greatly contributed to the renewal of geography education at the University of Debrecen. On the occasion of his 80th birthday, his colleagues interviewed Professor Kerényi about his family, profession, achievements and the state of global environmental systems.
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- 2023
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16. Prediction of some selected soil properties using the Hungarian Mid-infrared spectral library
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Mohammed Ahmed MohammedZein, Adam Csorba, Brian Rotich, Phenson Nsima Justin, Hanaa Tharwat Mohamed, and Erika Micheli
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mid-infrared spectroscopy ,soil information monitoring system ,partial least square regression ,fourier transform infrared spectrometer ,coefficient determination ,Agriculture (General) ,S1-972 - Abstract
Routine soil chemical and physical laboratory analysis provides a better understanding of the soil by evaluating its quality and functions. Demands for the development of national Mid-infrared (MIR) spectral libraries for predicting soil attributes with high accuracy have risen substantially in the recent past. Such MIR spectral library is usually regarded as a fast, cheap and non-destructive technique for estimating soil properties compared to laboratory soil analysis. The main objective of this research was to assess the performance of the Hungarian MIR spectral library in estimating four soil properties namely: Cation Exchange Capacity (CEC), Exchangeable Mg and Ca and pH water at different scenarios. Archived soil samples were scanned and spectra data were saved in the Fourier transform infrared spectrometer OPUS software. Preprocessed filtering, outlier detection and calibration sample selection methods were applied to the spectral library. MIR calibration models were built for soil attributes using partial least square regression method and the models were validated with sample predictions. R2, RMSE and RPD were used to assess the goodness of calibration and validation models. MIR spectral library had the ability to estimate soil properties such as CEC and exchangeable Ca and Mg through various scale models (national, county and soil type). The findings showed that the Hungarian MIR spectral library for estimation of soil properties has the ability to provide good information on national, county and soil type scales at different levels of accuracy.
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- 2023
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17. Development of Hungarian spectral library: Prediction of soil properties and applications
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Mohammed Ahmed MohammedZein, Adam Csorba, Brian Rotich, Phenson Nsima Justin, Caleb Melenya, Yuri Andrei, and Erika Micheli
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fourier-transform infrared spectroscopy ,mid-infrared spectroscopy ,partial least square regression ,soil information system ,Agriculture (General) ,S1-972 - Abstract
Updating soil information systems (SIS) requires advanced technologies to support the time and cost-effective and environment-friendly soil data. The use of mid- infrared (MIR) Spectroscopy as alternative to wet chemistry has been tested. The MIR spectral library is a useful technique for predicting soil attributes with high accuracy, efficiency, and low cost. The Hungarian MIR spectral library contained data on 2200 soil samples from 10 counties representing the first Soil Information and Mentoring System (SIMS) survey. Archived soil samples were prepared and scanned based on Diffuse Reflectance Infrared spectroscopy (DRIFT) technique and spectra data were saved in the fourier transform infrared (FTIR) spectrometer OPUS software. Preprocessed filtering methods, outlier detection methods and calibration sample selection methods were applied for spectral library. MIR calibration models were built for soil attributes using Partial Least Square Regression (PLSR) method. Coefficient determination (R2), The Root Mean Squared Error (RMSE) and Ratio of Performance to Deviation (RPD) were used to assess the goodness of calibration and validation models. MIR spectral library had the ability to significantly estimate soil properties such as SOC, CaCO3, sand, clay and silt through various scale models (national, county and soil type). The findings showed that our spectral library soil estimations are precise enough to provide information on national, county and soil type levels enabling a wide range of soil applications that demand huge amounts of data such as soil survey, precision agriculture and digital soil mapping.
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- 2023
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18. Our country should get closer to the non-Western BRICS economic alliance
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Csorba, Emerson
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BRICS -- Powers and duties ,Market trend/market analysis ,Economic conditions -- Forecasts and trends ,Gross domestic product -- Forecasts and trends ,International economic relations -- Political aspects - Abstract
Byline: EMERSON CSORBA Business executive, previously working in geopolitics The outcome of the American election underscores Canada's economic and intellectual dependence on the U.S. market and the consequences of it. [...]
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- 2024
19. Effect of liposomal formulation of ascorbic acid on corneal permeability
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Csorba, Anita, Katona, Gábor, Budai-Szűcs, Mária, Balogh-Weiser, Diána, Fadda, Anna Maria, Caddeo, Carla, Takács, Ágnes Ildikó, Mátyus, Péter, Balogh, György T., and Nagy, Zoltán Zsolt
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- 2023
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20. Coding and noncoding transcriptomes of NODULIN HOMEOBOX (NDX)-deficient Arabidopsis inflorescence
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Orsolya Feró, Zsolt Karányi, Éva Nagy, Ágnes Mosolygó-L, Henrik Mihály Szaker, Tibor Csorba, and Lóránt Székvölgyi
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Science - Abstract
Abstract Arabidopsis NODULIN HOMEOBOX (NDX) is a plant-specific transcriptional regulator whose role in small RNA biogenesis and heterochromatin homeostasis has recently been described. Here we extend our previous transcriptomic analysis to the flowering stage of development. We performed mRNA-seq and small RNA-seq measurements on inflorescence samples of wild-type and ndx1-4 mutant (WiscDsLox344A04) Arabidopsis plants. We identified specific groups of differentially expressed genes and noncoding heterochromatic siRNA (hetsiRNA) loci/regions whose transcriptional activity was significantly changed in the absence of NDX. In addition, data obtained from inflorescence were compared with seedling transcriptomics data, which revealed development-specific changes in gene expression profiles. Overall, we provide a comprehensive data source on the coding and noncoding transcriptomes of NDX-deficient Arabidopsis flowers to serve as a basis for further research on NDX function.
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- 2023
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21. First records of Hypsugo joffrei (Thomas, 1915) and the revision of Philetor brachypterus (Temminck, 1840) specimens (Chiroptera: Vespertilionidae) from the Indian Subcontinent
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Saikia, Uttam, Csorba, Gábor, Ruedi, Manuel, and BioStor
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- 2020
22. Effect of ad libitum feeding of Holstein Friesian calves on immunological parameters and molecular stress on a transcriptional level
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Bodrogi, Lilla, Csorba, Blanka Borbála, Jurkovich, Viktor, Kiss, Gerda, Bagi, Zoltán, Bakony, Mikolt, and Kusza, Szilvia
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- 2023
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23. The diagnostic continua of the soils of Europe
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Ádám Csorba, Arwyn Jones, Tamás Szegi, Endre Dobos, and Erika Michéli
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diagnostic units ,world reference base ,european soil database ,soil functions ,Geography (General) ,G1-922 - Abstract
Diagnostic horizons, properties and materials are commonly applied building units of national and international soil classification systems. The presence, depth or absence of diagnostic information supports the process of objective soil classification, such as the World Reference Base (WRB). While the diagnostic units and associated descriptive qualifiers convey information that reflect pedogenesis, they also indicate important, and often complex properties that are related to soil fertility and other soil functions. The spatial extent or the continuum of diagnostic information is often different from the spatial extent of the mapping units in general soil maps (mostly reflecting soil types). This paper presents the spatial distribution of selected diagnostic units and qualifiers for the European Union and describes their significance for key soil functions. The derivation of selected diagnostics was performed based on the information provided in the European Soil Database and by taking into consideration the definitions, rules and allocation procedure of soils to the appropriate Reference Soil Group (RSG) defined by the WRB key. The definition of the presence/absence of the diagnostic units were performed by extracting information related to the first level of the WRB classification and to the qualifiers provided by the ESDB on the Soil Taxonomic Units (STU) level. The areal percentage of the STUs (thus, the derived diagnostics) within Soil Mapping Units (SMUs) was calculated and was visualized on separate maps. The study demonstrated the importance of the spatial information that the diagnostic elements convey, especially related to soil functions.
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- 2022
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24. Detection and sequence analysis of Canine morbillivirus in multiple species of the Mustelidae family
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Zsófia Lanszki, József Lanszki, Gábor Endre Tóth, Tamás Cserkész, Gábor Csorba, Tamás Görföl, András István Csathó, Ferenc Jakab, and Gábor Kemenesi
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Carnivora ,Mustelids ,NGS ,MinION ,Third generation sequencing ,Protected species ,Veterinary medicine ,SF600-1100 - Abstract
Abstract Background Canine morbillivirus (canine distemper virus, CDV) is a member of the Paramyxoviridae family. Canine distemper is a serious viral disease that affects many mammalian species, including members of the Mustelidae family. These animals have an elusive nature, which makes related virological studies extremely challenging. There is a significant knowledge gap about the evolution of their viruses and about the possible effects of these viruses to the population dynamics of the host animals. Spleen and lung tissue samples of 170 road-killed mustelids belonging to six species were collected between 1997 and 2022 throughout Hungary and tested for CDV with real-time RT-PCR. Results Three species were positive for viral RNA, 2 out of 64 Steppe polecats (Mustela eversmanii), 1 out of 36 European polecats (Mustela putorius) and 2 out of 36 stone martens (Martes foina); all 18 pine martens (Martes martes), 10 least weasels (Mustela nivalis) and 6 stoats (Mustela erminea) tested negative. The complete CDV genome was sequenced in five samples using pan-genotype CDV-specific, amplicon-based Nanopore sequencing. Based on the phylogenetic analysis, all five viral sequences were grouped to the Europe/South America 1 lineage and the distribution of one sequence among trees indicated recombination of the Hemagglutinin gene. We verified the recombination with SimPlot analysis. Conclusions This paper provides the first CDV genome sequences from Steppe polecats and additional complete genomes from European polecats and stone martens. The infected specimens of various species originated from distinct parts of the country over a long time, indicating a wide circulation of CDV among mustelids throughout Hungary. Considering the high virulence of CDV and the presence of the virus in these animals, we highlight the importance of conservation efforts for wild mustelids. In addition, we emphasize the importance of full genomic data acquisition and analysis to better understand the evolution of the virus. Since CDV is prone to recombination, specific genomic segment analyses may provide less representative evolutionary traits than using complete genome sequences.
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- 2022
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25. NODULIN HOMEOBOX is required for heterochromatin homeostasis in Arabidopsis
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Zsolt Karányi, Ágnes Mosolygó-L, Orsolya Feró, Adrienn Horváth, Beáta Boros-Oláh, Éva Nagy, Szabolcs Hetey, Imre Holb, Henrik Mihály Szaker, Márton Miskei, Tibor Csorba, and Lóránt Székvölgyi
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Science - Abstract
Arabidopsis NDX was previously reported as a regulator of euchromatic gene expression. Here the authors show that NDX functions at pericentromeric regions and regulates heterochromatin homeostasis by controlling siRNA production and non-CG methylation.
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- 2022
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26. Corticosteroid-sparing topical treatment with cyclosporin for juvenile keratoconjunctivitis.
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Barcsay-Veres, Amarilla, Csorba, Anita, Kovacs, Illes, Tothfalusi, Laszlo, and Maneschg, Otto Alexander
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ALLERGIC conjunctivitis ,MEDICAL sciences ,CYCLOSPORINE ,CHILD patients ,EYE inflammation ,ADRENOCORTICAL hormones - Abstract
Ocular surface inflammation due to allergy and blepharitis can lead to corneal complications and visual impairment. The aim of this study is to evaluate the efficacy of a cyclosporin 0.1% topical treatment achieving steroid-sparing. Eighty pediatric patients with moderate and severe vernal and blepharitis-related keratoconjunctivitis were included. Symptoms (photosensitivity, itching, discharge, tearing), signs (corneal fluorescein staining, papillary hypertrophy) and patients' subjective assessment were evaluated during a 6-month follow-up. At the follow-up, all patients treated with topical cyclosporin showed a significant improvement in all subjective symptoms and objective signs (p < 0.001). The total number of courses of rescue steroids courses decreased from 3.71 ± 1.72 to 0.25 ± 0.49 at month 3 and to 0.13 ± 0.38 dropping bottle at month 6 (p < 0.001 at both time points). The 96.1% of the allergic cohort and 96.4% of the blepharitis cohort experienced a satisfactory good or rapid and good effect during the 6-month follow-up. The probability of needing rescue corticosteroids increased with an odds ratio of 1.98, (95% CI: 1.19–3.28, p = 0.008) for each unit increase in Oxford score when analysing the whole cohort. Topical cyclosporin seems to be very effective reducing the number of recurrences of corneal involvement and the need for steroid treatment. [ABSTRACT FROM AUTHOR]
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- 2025
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27. Long-range cortical synchronization supports abrupt visual learning
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Csorba, Bennett A., Krause, Matthew R., Zanos, Theodoros P., and Pack, Christopher C.
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- 2022
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28. Exploring the Archaeome: Detection of Archaeal Signatures in the Human Body.
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Pausan, Manuela, Csorba, Cintia, Singer, Georg, Till, Holger, Schöpf, Veronika, Santigli, Elisabeth, Klug, Barbara, Högenauer, Christoph, Blohs, Marcus, and Moissl-Eichinger, Christine
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amplicon sequencing ,detection ,human archaeome ,human body ,methodology - Abstract
Due to their fundamentally different biology, archaea are consistently overlooked in conventional microbiome surveys. Using amplicon sequencing, we evaluated methodological set-ups to detect archaea in samples from five different body sites: respiratory tract (nasal cavity), digestive tract (mouth, appendix, and stool) and skin. With optimized protocols, the detection of archaeal ribosomal sequence variants (RSVs) was increased from one (found in currently used, so-called universal approach) to 81 RSVs in a representative sample set. The results from this extensive primer-evaluation led to the identification of the primer pair combination 344f-1041R/519F-806R which performed superior for the analysis of the archaeome of gastrointestinal tract, oral cavity and skin. The proposed protocol might not only prove useful for analyzing the human archaeome in more detail but could also be used for other holobiont samples.
- Published
- 2019
29. Investigation of the effects of bovine collagen peptides and mixed berries on rheological properties and biological activity of egg white-based beverage via central composite design
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Adrienn Varga-Tóth, Csaba Németh, István Dalmadi, Tamás Csurka, Renáta Csorba, Majd Elayan, Munkhnasan Enkhbold, Karina Hidas, and László Ferenc Friedrich
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egg white ,dairy replacement ,functional food ,central composite design - response surface methodology ,bioactive compounds ,bovine collagen peptides ,Nutrition. Foods and food supply ,TX341-641 - Abstract
Modern consumer expectations have become highly diversified: they want more opportunities to meet diverse family needs (diversity of family members in age, gender, physical activity, etc. ,) and individual health goals with a huge variety of sensorial preferences. Our research is aimed to develop a protein-dense, highly bioactive, lactose- and whey protein-free beverage applying a central composite rotational design (CCRD) with 2 factors. For this purpose, an egg white-based beverage was flavored with mixed berries (factor A) and enriched with bovine collagen peptides (factor B). After suitable sample preparation, the rheological properties were investigated by an Anton Paar MCR 92 rheometer (with CC 27 system, and flow behavior was analyzed with a Herschel-Bulkley (H-B) model). The antioxidant capacity of samples was investigated by Ferric Reducing Antioxidant Power (FRAP) method, the total anthocyanin content was estimated based on a spectrophotometric method, and the total phenolic content was determined by the Folin Ciocalteu method. Our results are figured on response surfaces demonstrating that both factors and their interactions show a positive correlation with the examined parameters. Based on the CCRD, all investigated parameters are significantly influenced by at least one aspect and can be adequately estimated for further product development.
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- 2023
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30. Investigation of supramolecular architectures of bent-shaped pyridine derivatives: from a three-ring crystalline compound towards five-ring mesogens
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Trišović, Nemanja, Antanasijević, Jelena, Rogan, Jelena, Poleti, Dejan, Tóth-Katona, Tibor, Salamonczyk, Miroslaw, Jákli, Antal, and Fodor-Csorba, Katalin
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Physics - Chemical Physics - Abstract
In searching for novel photoactive liquid crystals, we have synthesized a series of five-ring pyridine-based bent-core compounds bearing different substituents at the peripheral phenyl rings (CH3O, Cl and NO2). Their mesomorphic behaviour has been investigated by polarizing optical microscopy, differential scanning calorimetry and X-ray scattering, and then compared with the unsubstituted parent compound. The introduction of the methoxy groups at the peripheral phenyl rings of the bent core results in a non-mesomorphic compound, whereas the chloro- and nitro-substituted compounds form enantiotropic B1-like phases. Significant changes of the textures and transition temperatures of the mesophase have been observed under UV light. The presented investigation of the mesomorphic properties of the synthesized compounds, coupled with analysis of the molecular packing of the related three-ring compounds, will help to design self-organized molecules suitable for UV indicators., Comment: 9 pages, 8 figures, revised version appeared in New Journal of Chemistry
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- 2016
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31. Complete mitochondrial genomes reveal robust phylogenetic signals and evidence of positive selection in horseshoe bats
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Lin Zhang, Keping Sun, Gábor Csorba, Alice Catherine Hughes, Longru Jin, Yanhong Xiao, and Jiang Feng
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Mitogenome ,Rhinolophus ,Comparative analysis ,Positive selection ,Ecology ,QH540-549.5 ,Evolution ,QH359-425 - Abstract
Abstract Background In genus Rhinolophus, species in the Rhinolophus philippinensis and R. macrotis groups are unique because the horseshoe bats in these group have relatively low echolocation frequencies and flight speeds compared with other horseshoe bats with similar body size. The different characteristics among bat species suggest particular evolutionary processes may have occurred in this genus. To study the adaptive evidence in the mitochondrial genomes (mitogenomes) of rhinolophids, especially the mitogenomes of the species with low echolocation frequencies, we sequenced eight mitogenomes and used them for comparative studies of molecular phylogeny and adaptive evolution. Results Phylogenetic analysis using whole mitogenome sequences produced robust results and provided phylogenetic signals that were better than those obtained using single genes. The results supported the recent establishment of the separate macrotis group. The signals of adaptive evolution discovered in the Rhinolophus species were tested for some of the codons in two genes (ND2 and ND6) that encode NADH dehydrogenases in oxidative phosphorylation system complex I. These genes have a background of widespread purifying selection. Signals of relaxed purifying selection and positive selection were found in ND2 and ND6, respectively, based on codon models and physicochemical profiles of amino acid replacements. However, no pronounced overlap was found for non-synonymous sites in the mitogenomes of all the species with low echolocation frequencies. A signal of positive selection for ND5 was found in the branch-site model when R. philippinensis was set as the foreground branch. Conclusions The mitogenomes provided robust phylogenetic signals that were much more informative than the signals obtained using single mitochondrial genes. Two mitochondrial genes that encoding proteins in the oxidative phosphorylation system showed some evidence of adaptive evolution in genus Rhinolophus and the positive selection signals were tested for ND5 in R. philippinensis. These results indicate that mitochondrial protein-coding genes were targets of adaptive evolution during the evolution of Rhinolophus species, which might have contributed to a diverse range of acoustic adaptations in this genus.
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- 2021
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32. Emerging risk identification by applying data analytical tools
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Elisa Palmas, Tekla Engelhardt, Zsuzsa Farkas, Szilveszter Csorba, Erika Országh, and Ákos Bernard Józwiak
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data analysis ,visualisation tool ,emerging risk identification ,text mining ,Nutrition. Foods and food supply ,TX341-641 ,Chemical technology ,TP1-1185 - Abstract
Abstract The working programme ‘Emerging risk identification by applying data analytical tools’ was delivered by the Digital Food Chain Education, Research, Development, and Innovation Institute (Digital Food Institute, DFI) on the field of emerging risks at the University of Veterinary Medicine Budapest, Hungary. The Institute is the University's research and education unit that provides data analysis and research along the whole food chain and takes networking in this area to a new level. The Fellow joined the hub of experts and researchers in the field of food chain safety data analysis, responsible for protecting public health concerning food in Hungary. The programme consisted of several different activities to provide an overview of the different tools that can be employed in the emerging risk identification process and prepare various stakeholders for new food chain safety issues. The programme was split into four modules to run over the one‐year fellowship covering different areas of data analysis and emerging risk identification. The aim was to be fully integrated with the organisation's work experience, increase knowledge of scientific aspects relevant in the field of data analysis and visualisation tools in the emerging risk identification area, and implement the results into various EU stakeholders' environments assessments.
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- 2022
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33. Metabolite Production in Alkanna tinctoria Links Plant Development with the Recruitment of Individual Members of Microbiome Thriving at the Root-Soil Interface
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Cintia Csorba, Nebojša Rodić, Yanyan Zhao, Livio Antonielli, Günter Brader, Angeliki Vlachou, Evangelia Tsiokanos, Ismahen Lalaymia, Stéphane Declerck, Vassilios P. Papageorgiou, Andreana N. Assimopoulou, and Angela Sessitsch
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plant ,microbiome ,alkannin ,alkanet ,metabolomics ,metabolome ,Microbiology ,QR1-502 - Abstract
ABSTRACT Plants are naturally associated with diverse microbial communities, which play significant roles in plant performance, such as growth promotion or fending off pathogens. The roots of Alkanna tinctoria L. are rich in naphthoquinones, particularly the medicinally used enantiomers alkannin and shikonin and their derivatives. Former studies already have shown that microorganisms may modulate plant metabolism. To further investigate the potential interaction between A. tinctoria and associated microorganisms, we performed a greenhouse experiment in which A. tinctoria plants were grown in the presence of three distinct soil microbiomes. At four defined plant developmental stages, we made an in-depth assessment of bacterial and fungal root-associated microbiomes as well as all extracted primary and secondary metabolite content of root material. Our results showed that the plant developmental stage was the most important driver influencing the plant metabolite content, revealing peak contents of alkannin/shikonin derivatives at the fruiting stage. Plant root microbial diversity was influenced both by bulk soil origin and to a small extent by the developmental stage. The performed correlation analyses and cooccurrence networks on the measured metabolite content and the abundance of individual bacterial and fungal taxa suggested a dynamic and at times positive or negative relationship between root-associated microorganisms and root metabolism. In particular, the bacterial genera Labrys and Allorhizobium-Neorhizobium-Pararhizobium-Rhizobium as well as four species of the fungal genus Penicillium were found to be positively correlated with higher content of alkannins. IMPORTANCE Previous studies have shown that individual, isolated microorganisms may influence secondary metabolism of plants and induce or stimulate the production of medicinally relevant secondary metabolism. Here, we analyzed the microbiome-metabolome linkage of the medicinal plant Alkanna tinctoria, which is known to produce valuable compounds, particularly the naphthoquinones alkannin and shikonin and their derivatives. A detailed bacterial and fungal microbiome and metabolome analysis of A. tinctoria roots revealed that the plant developmental stage influenced root metabolite production, whereas soil inoculants from three different geographical origins in which plants were grown shaped root-associated microbiota. Metabolomes of plant roots of the same developmental stage across different soils were highly similar, pinpointing to plant maturity as the primary driver of secondary metabolite production. Correlation and network analyses identified bacterial and fungal taxa showing a positive relationship between root-associated microorganisms and root metabolism. In particular, the bacterial genera Allorhizobium-Neorhizobium-Pararhizobium-Rhizobium and Labrys as well as the fungal species of genus Penicillium were found to be positively correlated with higher content of alkannins.
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- 2022
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34. Soil fertility management among smallholder farmers in Mount Kenya East region
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Wawire, Amos W., Csorba, Ádám, Tóth, József A., Michéli, Erika, Szalai, Márk, Mutuma, Evans, and Kovács, Eszter
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- 2021
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35. Factors influencing haze formation and corneal flattening, and the impact of haze on visual acuity after conventional collagen cross-linking: a 12-month retrospective study
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Anita Csorba, Kinga Kránitz, Péter Dormán, Andrea Popper-Sachetti, Huba Kiss, Irén Szalai, and Zoltán Zsolt Nagy
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Keratoconus ,Conventional cross-linking ,Densitometry ,Corneal haze ,Visual outcome ,Ophthalmology ,RE1-994 - Abstract
Abstract Background Our aim was to determine associations of pachymetry, keratometry, and their changes with haze formation and corneal flattening after collagen cross-linking, and to analyse the relationship between postoperative haze and visual outcome. Methods Retrospective analysis was performed on 47 eyes of 47 patients with keratoconus using the Pentacam HR Scheimpflug camera before and 1, 3, 6 and 12 months after cross-linking. Corneal backscattered light values in grey scale unit were recorded in the anterior, center and posterior corneal layers and in four concentric rings. Surface area- and thickness-corrected grey scale unit values were assessed with an additional calculation. Friedman test with post hoc Wilcoxon signed-rank test was used to analyse changes in visual acuity, pachymetry, keratometry and densitometry. Spearman’s rank correlation test was used to detect correlations of haze formation and corneal flattening with pachymetry, keratometry and their postoperative change. Generalized estimating equations analysis was used to investigate the influence of densitometry values on postoperative visual acuity after controlling for the effect of preoperative keratometry. Results One year after treatment, significant flattening was observed in maximum and mean keratometry readings (p
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- 2021
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36. Inferring the ecological niche of bat viruses closely related to SARS-CoV-2 using phylogeographic analyses of Rhinolophus species
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Alexandre Hassanin, Vuong Tan Tu, Manon Curaudeau, and Gabor Csorba
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Medicine ,Science - Abstract
Abstract The Severe Acute Respiratory Syndrome coronavirus 2 (SARS-CoV-2) is the causal agent of the coronavirus disease 2019 (COVID-19) pandemic. To date, viruses closely related to SARS-CoV-2 have been reported in four bat species: Rhinolophus acuminatus, Rhinolophus affinis, Rhinolophus malayanus, and Rhinolophus shameli. Here, we analysed 343 sequences of the mitochondrial cytochrome c oxidase subunit 1 gene (CO1) from georeferenced bats of the four Rhinolophus species identified as reservoirs of viruses closely related to SARS-CoV-2. Haplotype networks were constructed in order to investigate patterns of genetic diversity among bat populations of Southeast Asia and China. No strong geographic structure was found for the four Rhinolophus species, suggesting high dispersal capacity. The ecological niche of bat viruses closely related to SARS-CoV-2 was predicted using the four localities in which bat viruses were recently discovered and the localities where bats showed the same CO1 haplotypes than virus-positive bats. The ecological niche of bat viruses related to SARS-CoV was deduced from the localities where bat viruses were previously detected. The results show that the ecological niche of bat viruses related to SARS-CoV2 includes several regions of mainland Southeast Asia whereas the ecological niche of bat viruses related to SARS-CoV is mainly restricted to China. In agreement with these results, human populations in Laos, Vietnam, Cambodia, and Thailand appear to be much less affected by the COVID-19 pandemic than other countries of Southeast Asia. In the climatic transitional zone between the two ecological niches (southern Yunnan, northern Laos, northern Vietnam), genomic recombination between highly divergent viruses is more likely to occur. Considering the limited data and the risk of recombinant bat-CoVs emergence as the source of new pandemics in humans, the bat populations in these regions should be under surveillance.
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- 2021
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37. Comparing Soil Chemical and Biological Properties of Salt Affected Soils under Different Land Use Practices in Hungary and India
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Gangwar, R. K., Makádi, M., Demeter, I., Táncsics, A., Cserháti, M., Várbíró, G., Singh, J., Csorba, Á., Fuchs, M., Michéli, E., and Szegi, T.
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- 2021
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38. Diagnosis of Child Sexual Abuse.
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Csorba, Roland, Atas Elfrink, Zeynep, and Tsikouras, Panagiotis
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- *
REPORTING of child abuse , *MEDICAL personnel , *MEDICAL history taking , *SEX crimes , *DIAGNOSIS , *CHILD sexual abuse - Abstract
Child sexual abuse (CSA) is a widespread and alarming issue, with an estimated global prevalence of 12–13% (affecting 18% of girls and 8% of boys). Despite its prevalence, many physicians working with children have insufficient knowledge of the medical diagnosis of CSA. This lack of expertise, combined with the sensitive and complex nature of these cases, often hampers proper identification and management. Diagnosing CSA is particularly challenging and requires specialized skills. A majority of children assessed for suspected sexual abuse present with normal genital and anal findings, which complicates the diagnostic process. Barriers such as professional isolation, societal taboos, and the sensitive nature of the subject often result in diagnostic failures. Accurate medical history taking, diagnosis, and documentation of findings are essential for ensuring a precise diagnosis, safeguarding children, and supporting legal proceedings. However, achieving these goals remains elusive without standardized guidelines and adequately trained healthcare professionals. Training of professionals in observing and reporting child sexual abuse is badly needed. This review explores the current state of medical diagnosis in suspected cases of CSA. This article is based on a selective review of pertinent literature retrieved from various databases, including PubMed and the overall index of the Quarterly Update. [ABSTRACT FROM AUTHOR]
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- 2024
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39. The Effects of Cutting Parameters on Cutting Force and Tribological Properties of Machined Surface Under Dry Turning of AISI304L Austenitic Stainless Steel.
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Kónya, Gábor, Csorba, Béla, Szabó, Norbert, and Kovács, Zsolt F.
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AUSTENITIC stainless steel ,SURFACE resistance ,WEAR resistance ,CUTTING force ,CARBIDE cutting tools ,MACHINABILITY of metals - Abstract
In this study, the effects of cutting speed and feed rate on the roughness parameters R
a , Rz , Rsk , Rku , Rpk , Rvk , and A2 were examined during machining with coated carbide tools in a dry environment. The authors introduced the Rvk /Rpk ratio, a coefficient that facilitates a simpler evaluation of surface wear resistance. Specifically, if this ratio is greater than 1, the surface is more wear-resistant, while values less than 1 indicate a higher tendency for surface wear. The Taguchi OA method was used to analyze and identify the significance of technological parameters on output characteristics. Based on the results, it was established that feed rate has the greatest impact on all output characteristics. The highest cutting force was measured at a cutting speed of 60 m/min and a feed rate of 0.15 mm/rev, attributed to the fact that at lower cutting speeds, the base material does not soften while the cross-sectional area of the chip increases. To achieve the lowest Ra and Rz surface roughness, a cutting speed of 100 m/min and a feed rate of 0.05 mm/rev are recommended. If the goal is to enhance surface wear resistance and improve oil retention capability, machining with a cutting speed of 80–100 m/min and a feed rate of 0.15 mm/rev is advisable, as the coarser machining increases both the Rvk /Rpk ratio and the oil-retaining pocket size, which together improve the wear resistance of the machined surface. [ABSTRACT FROM AUTHOR]- Published
- 2024
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40. Facile Determination of Aluminum Content in Industrial Brine by Investigating the Effects of Buffer Systems.
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Csorba, Benjámin, Farkas, László, Csécsi, Marcell, Mika, László T., and Gresits, Iván L.
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CATIONIC surfactants ,BIOSURFACTANTS ,CYANINES ,SALT ,DETECTION limit - Abstract
The aluminum content of concentrated (27 wt%) sodium chloride solutions could be crucial for large‐scale chlor‐alkali‐based industries applying membrane cell electrolysis. Thus, a facile method which enables a fast and reliable protocol to determine the Al content of these solutions on ppb scale in industrial environments is fundamentally important. It was demonstrated that the increased sensitivity of colorful Al‐ECR (eriochrome cyanine R) complex by the use of a cationic surfactant and specific biological buffers could effectively indicate the Al content in an extended pH interval of a concentrated saline medium under industrial conditions. The dependence of the analytical protocol on pH, temperature, time, wavelength, and the salinity of the medium was investigated. It was shown that the absorbance‐based measurements of the solution should be performed at least 2–4 h after its preparation. By applying the selected two Good's buffers (HEPES: 4‐(2‐hydroxyethyl)‐1‐piperazineethanesulfonic acid, MOPS: 3‐(N‐morpholino)‐propanesulfonic acid) and Tris (tris(hydroxymethyl)aminomethane), 32.8–38.1 % increase in the sensitivity was achieved for saturated NaCl solutions. Moreover, the limits of detection and quantification (LOD, LOQ) were also lowered by 19.0–29.8 %, and the salinity dependence of the calibration was also reduced. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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41. The Effect of Spinosad on the Oak Lace Bug Corythucha arcuata (Hemiptera: Tingidae)—A Preliminary Study Performed Under Laboratory Conditions.
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Fora, Ciprian George, Csorba, Artúr Botond, and Balog, Adalbert
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- *
SPINOSAD , *PEST control , *INSECT pest control , *CHRONOBIOLOGY , *INSECT diversity - Abstract
Simple Summary: The oak lace bug is a rapidly spreading oak forest pest in Europe. These days, chemical control has been largely reduced in favor of biological methods due to the high biodiversity values of these forests. Here, we tested for the first time the effect of biological compound spinosad on lace bug mortality and found that this can be an effective method of controlling this insect pest. The effect of biopesticide compound spinosad in different concentrations was tested for the first time under laboratory conditions against the rapidly spreading forest pest, oak lace bug (Corythucha arcuata, Say 1832), and its effects were compared with the synthetic pesticide lambda-cyhalothrin. These results revealed a significant effect of spinosad at 2 mL/4 L and 2 mL/2 L water concentrations against C. arcuata nymphs. The mortality rate after 3 days was similar to synthetic insecticide effects and reached 94% and 98%, respectively. Overall, it can be concluded that spinosad is an effective biological method to control oak lace bug; treatments under field conditions should consider the high diversity of other insects in oak forests. [ABSTRACT FROM AUTHOR]
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- 2024
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42. Probabilistic modeling and risk characterization of the chronic aflatoxin M1 exposure of Hungarian consumers
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Zsuzsa Farkas, Kata Kerekes, Árpád Ambrus, Miklós Süth, Ferenc Peles, Tünde Pusztahelyi, István Pócsi, Attila Nagy, Péter Sipos, Gabriella Miklós, Anna Lőrincz, Szilveszter Csorba, and Ákos Bernard Jóźwiak
- Subjects
AFM1 ,mycotoxin exposure assessment ,long-term exposure ,probabilistic method ,consumer groups at risk ,Microbiology ,QR1-502 - Abstract
Aflatoxin contamination can appear in various points of the food chain. If animals are fed with contaminated feed, AFB1 is transformed—among others—to aflatoxin M1 (AFM1) metabolite. AFM1 is less toxic than AFB1, but it is still genotoxic and carcinogenic and it is present in raw and processed milk and all kinds of milk products. In this article, the chronic exposure estimation and risk characterization of Hungarian consumers are presented, based on the AFM1 contamination of milk and dairy products, and calculated with a probabilistic method, the two-dimensional Monte-Carlo model. The calculations were performed using the R plugin (mc2d package) integrated into the KNIME (Konstanz Information Miner) software. The simulations were performed using data from the 2018–2020 food consumption survey. The AFM1 analytical data were derived from the Hungarian monitoring survey and 1,985 milk samples were analyzed within the framework of the joint project of the University of Debrecen and the National Food Chain Safety Office of Hungary (NÉBIH). Limited AFM1 concentrations were available for processed dairy products; therefore, a database of AFM1 processing factors for sour milk products and various cheeses was produced based on the latest literature data, and consumer exposure was calculated with the milk equivalent of the consumed quantities of these products. For risk characterization, the calculation of hazard index (HI), Margin of Exposure, and the hepatocellular carcinoma incidence were used. The results indicate that the group of toddlers that consume a large amount of milk and milk products are exposed to a certain level of health risk. The mean estimated daily intake of toddlers is in the range of 0.008–0.221 ng kg−1 bw day−1; the 97.5th percentile exposure of toddlers is between 0.013 ng kg−1 bw day−1 and 0.379 ng kg−1 bw day−1, resulting in a HI above 1. According to our study, the exposure of older age groups does not pose an emergent health risk. Nevertheless, the presence of carcinogenic compounds should be kept to a minimum in the whole population.
- Published
- 2022
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43. Fully automatic segmentation of right and left ventricle on short-axis cardiac MRI images
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Budai, Adam, Suhai, Ferenc I., Csorba, Kristof, Toth, Attila, Szabo, Liliana, Vago, Hajnalka, and Merkely, Bela
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- 2020
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44. Assessing and improving the biocompatibility of microfluidic artificial lungs
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Thompson, Alex J., Ma, Lindsay J., Major, Terry, Jeakle, Mark, Lautner-Csorba, Orsolya, Goudie, Marcus J., Handa, Hitesh, Rojas-Peña, Alvaro, and Potkay, Joseph A.
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- 2020
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45. Phase behaviors of binary mixtures composed of banana-shaped and calamitic mesogens
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Cvetinov, M., Obadović, D. Ž., Stojanović, M., Vajda, A., Fodor-Csorba, K., Eber, N., and Ristić, I.
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Condensed Matter - Soft Condensed Matter - Abstract
In this work, five mixtures with different concentrations of banana-shaped and calamitic compounds have been prepared and subsequently studied by polarizing optical microscopy, differential scanning calorimetry, and X-ray diffraction on non-oriented samples. The phase sequences and molecular parameters of the binary systems are presented.
- Published
- 2014
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46. Powder Diffraction Data and Mesomorphic Properties for 4-Butyloxyphenyl 4'-Decyloxybenzoate
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Cvetinov, M., Stojanović, M., Obadović, D., Rakić, S., Vajda, A., Fodor-Csorba, K., and Éber, N.
- Subjects
Condensed Matter - Materials Science - Abstract
Unit cell parameters obtained from X-ray powder diffraction data are presented for the crystalline phase of a liquid crystal 4-butyloxyphenyl 4'-decyloxybenzoate: a = 23.098 (4) {\AA}, b = 5.974 (6) {\AA}, c = 12.357 (10) {\AA}, \b{eta} = 121.53 (8){\deg}, unit-cell volume V = 1453.56 {\AA}3. Temperature dependent X-ray diffraction data confirmed the existence of smectic A and smectic C mesophases and a more ordered, tilted crystalline smectic phase. Possibility of existence of previously reported smectic B phase as well as another crystalline phase was refuted.
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- 2014
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47. Instabilities induced by Light in Liquid Crystal Cells with a Photo-Responsive Substrate
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Tóth-Katona, T., Fodor-Csorba, K., Vajda, A., and Jánossy, I.
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Condensed Matter - Soft Condensed Matter - Abstract
Instabilities are discussed which take place when a nematic liquid crystal (LC) layer, enclosed between a planar reference plate and a photosensitive substrate, is illuminated with polarized light from the reference side ({\it reverse} geometry). The dependence of the observed effects on the wavelength, polarization direction of the light, and on the thickness of the LC layer is explained by a model based on photoinduced surface torque. The application possibilities of the phenomena are also explored., Comment: 7 pages, 4 figures
- Published
- 2014
48. Mesophase behaviour of binary mixtures of bent-core and calamitic compounds
- Author
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Cvetinov, M., Obadović, D., Stojanović, M., Lazar, D., Vajda, A., Éber, N., Fodor-Csorba, K., and Ristić, I.
- Subjects
Condensed Matter - Soft Condensed Matter - Abstract
The mesophase behaviour of binary mixtures of bent-core and calamitic liquid crystals is presented. The nematogenic 4,6-dichloro-1,3-phenylene bis[4'-(10-undecen-1-yloxy)-1,1'-biphenyl-4-carboxylate] (I) was the banana-shaped component. As the calamitic compound ethyl 4'-(9-decen-1-yloxy)-1,1'-biphenyl-4-carboxylate (II), similar to one arm of the bent-core molecule, was used which exhibits smectic phases in a wide temperature range. A total of 6 mixtures with different compositions were prepared and studied by polarising optical microscopy, differential scanning calorimetry and X-ray diffraction on non-oriented samples. In the mixtures a nematic phase is not concomitant with smectic A phase, and the temperature range of both phases highly depends on the concentration of the comprising compounds. Lowered melting temperatures have been observed for all mixtures with respect to that of the pure compounds. Unforeseen finding is the induction of a monotropic SmC phase in mixtures with lowest concentration of the bent-core compound. Semi-empirical quantum-chemical calculations have also been performed. Based on the calculated molecular conformation, as well as on collected X-ray diffraction data, a model for a possible self-assembly of the banana-shaped and calamitic compounds is proposed., Comment: 13 pages, 8 figures, 3 tables
- Published
- 2014
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49. What Is It 'To Lead?': A Nuanced Exploration of Leadership by 3M National Student Fellows
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Bajer-Koulack, Ameena, Csorba, Emerson Thomas, Lee, Kyuwon Rosa, Smrke, Brianna, and Smyth, Tristan
- Abstract
In Canadian higher education, students from across the world interact within tight-knit communities, sharing ideas and developing a wealth of soft and disciplinary skills. With many universities playing host to dozens if not hundreds of student groups, the word "leadership" is uttered by students and faculty in hallways, gymnasiums, outdoors areas and of course, student group meeting rooms. On June 20, 2013, five members of the 2013 3M National Student Fellowship cohort explored the term "leadership," sharing their personal experiences and observations with Canadian faculty members as part of a Society for Teaching and Learning in Higher Education (STLHE) workshop. This paper explores the conversations and ideas that emerged at the workshop in light of the group's pre-STLHE online discussions and the current emphasis on leadership in Canadian higher education.
- Published
- 2014
50. 云南三种管鼻蝠形态特征描述及系统发育
- Author
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张欣 1 钟韦凌 1 吴毅 1 黄正澜懿 1 Gabor CSORBA 2 刘硕 3 王巧燕 4 权锐昌 5 李松 3 余文华
- Subjects
管鼻蝠 ,形态特征 ,系统发育 ,云南省 ,新记录 ,Zoology ,QL1-991 - Abstract
云南西双版纳地理位置独特,森林覆盖率高,哺乳动物物种多样性丰富,但至今仅记录分布管鼻蝠2种,低于周边区域,存在被低估的可能。为摸清西双版纳热带植物园哺乳动物物种多样性状况,2019年4—5月在园区内进行生物多样性考察,使用蝙蝠竖琴网采集到管鼻蝠标本15只,根据其外形和头骨的形态学特征、数值分类学结果及基于线粒体细胞色素氧化酶亚基Ⅰ基因(COⅠ)和核基因重组激活基因Ⅱ(Rag2)的系统发育学证据,均支持上述标本为菲氏管鼻蝠(Murina feae)、哈氏管鼻蝠(Mharrisoni)和艾氏管鼻蝠(Meleryi),其中菲氏管鼻蝠和哈氏管鼻蝠为云南省蝙蝠分布新记录。云南的管鼻蝠种类记录由5种增加到7种,西双版纳的该类群记录由艾氏管鼻蝠和圆耳管鼻蝠(Mcyclotis)2种增加到4种,提示云南管鼻蝠物种多样性资源较为丰富。研究标本现保存于广州大学生命科学学院及中国科学院昆明动物博物馆。
- Published
- 2021
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