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499 results on '"Nagy, Károly"'

1. Local colonisations and extinctions of European birds are poorly explained by changes in climate suitability

Author

Howard, Christine, Marjakangas, Emma-Liina, Morán-Ordóñez, Alejandra, Milanesi, Pietro, Abuladze, Aleksandre, Aghababyan, Karen, Ajder, Vitalie, Arkumarev, Volen, Balmer, Dawn E., Bauer, Hans-Günther, Beale, Colin M., Bino, Taulant, Boyla, Kerem Ali, Burfield, Ian J., Burke, Brian, Caffrey, Brian, Chodkiewicz, Tomasz, Del Moral, Juan Carlos, Mazal, Vlatka Dumbovic, Fernández, Néstor, Fornasari, Lorenzo, Gerlach, Bettina, Godinho, Carlos, Herrando, Sergi, Ieronymidou, Christina, Johnston, Alison, Jovicevic, Mihailo, Kalyakin, Mikhail, Keller, Verena, Knaus, Peter, Kotrošan, Dražen, Kuzmenko, Tatiana, Leitão, Domingos, Lindström, Åke, Maxhuni, Qenan, Mihelič, Tomaž, Mikuska, Tibor, Molina, Blas, Nagy, Károly, Noble, David, Øien, Ingar Jostein, Paquet, Jean-Yves, Pladevall, Clara, Portolou, Danae, Radišić, Dimitrije, Rajkov, Saša, Rajković, Draženko Z., Raudonikis, Liutauras, Sattler, Thomas, Saveljić, Darko, Shimmings, Paul, Sjenicic, Jovica, Šťastný, Karel, Stoychev, Stoycho, Strus, Iurii, Sudfeldt, Christoph, Sultanov, Elchin, Szép, Tibor, Teufelbauer, Norbert, Uzunova, Danka, van Turnhout, Chris A. M., Velevski, Metodija, Vikstrøm, Thomas, Vintchevski, Alexandre, Voltzit, Olga, Voříšek, Petr, Wilk, Tomasz, Zurell, Damaris, Brotons, Lluís, Lehikoinen, Aleksi, and Willis, Stephen G.

Published
2023
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3. Strong convergence theorem for Walsh-Kaczmarz-Fej\'er means

Author

Gogolashvili, Nata, Nagy, Károly, and Tephnadze, George

Subjects
Mathematics - Classical Analysis and ODEs, Mathematics - Analysis of PDEs, 42C10
Abstract

As main result we prove that Fej\'er means of Walsh-Kaczmarz-Fourier series are uniformly bounded operators from the Hardy martingale space $\ H_{p}$ to the Hardy martingale space $H_{p}$ for $ 0

Published
2020

4. The existence and unicity of numerical solution of initial value problems by Walsh polynomials approach

Author

Nagy, Károly

Subjects
Mathematics - Classical Analysis and ODEs
Abstract

Chen and Hsiao gave the numerical solution of initial value problems of systems of linear differential equations with constant coefficients by Walsh polynomials approach. This result was improved by G\'at and Toledo for initial value problems of differential equations with variable coefficients on the interval $[0,1[$ and initial value $\xi=0$. In the present paper we discuss the general case while $\xi$ can take any arbitrary value in the interval $[0,1[$. We show the existence and uniform convergence of the numerical solution, as well.

Published
2020

9. Restricted summability of the multi-dimensional Ces\`aro means of Walsh-Kaczmarz-Fourier series

Author

Nagy, Károly and Salim, Mohamed

Subjects
Mathematics - Classical Analysis and ODEs, 42C10
Abstract

The properties of the maximal operator of the $(C,\alpha)$-means ($\alpha=(\alpha_1,\ldots,\alpha_d)$) of the multi-dimensional Walsh-Kaczmarz-Fourier series are discussed, where the set of indices is inside a cone-like set. We prove that the maximal operator is bounded from $H_p^\gamma$ to $L_p$ for $p_0< p $ ($p_0=\max{1/(1+\alpha_k): k=1,\ldots, d}$) and is of weak type $(1,1)$. As a corollary we get the theorem of Simon \cite{S1} on the a.e. convergence of cone-restricted two-dimensional Fej\'er means of integrable functions. At the endpoint case $p=p_0$, we show that the maximal operator $\sigma^{\kappa,\alpha,*}_L$ is not bounded from the Hardy space $H_{p_0}^\gamma$ to the space $L_{p_0}$.

Published
2018

10. Electronic and magnetic properties of black phosphorus

Author

Márkus, Bence G., Simon, Ferenc, Nagy, Károly, Fehér, Titusz, Wild, Stefan, Abellán, Gonzalo, Chacón-Torres, Julio C., Hirsch, Andreas, and Hauke, Frank

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

Black phosphorus has emerged as the next member in the graphene inspired two-dimensional materials family. Its electronic and magnetic properties are studied herein using electron and nuclear magnetic resonance techniques (ESR and NMR) and microwave conductivity measurement. The latter is a unique technique to study conductivity on air sensitive samples. The ESR study indicates the absence of free charge carriers and no sign of paramagnetic defects are found. $^{31}$P NMR shows the presence of a characteristic Pake doublet structure due to the interaction between $I = 1/2$ nuclei. Microwave conductivity shows, in accordance with the ESR results, that black phosphorus behaves as a semiconductor and we identify extrinsic and intrinsic charge carrier contributions to the conductivity and extracted the sizes of the gaps. ESR measurement also yields that bP might find applications as a microwave absorbent.

Published
2018
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12. Strong Approximation by Marcinkiewicz Means of two-dimensional Walsh-Kaczmarz-Fourier Series

Author

Goginava, Ushangi and Nagy, Karoly

Subjects
Mathematics - Analysis of PDEs, 42C10
Abstract

In this paper we study the exponential uniform strong approximation of Marcinkiewicz type of two-dimensional Walsh-Kaczmarz-Fourier series. In particular, it is proved that the Marcinkiewicz type of two-dimensional Walsh-Kaczmarz-Fourier series of the continuous function $f$ is uniformly strong summable to the function $f$ exponentially in the power $1/2$. Moreover, it is proved that this result is best possible.

Published
2016

13. The First 5 Years of the Newest Eurotransplant Member State: Hungarian Results of International Organ Exchange From 2014 to 2018

Author

Mihály, Sándor, Smudla, Anikó, Ablonczy, László, Kóbori, László, Nemes, Balázs, Rényi-Vámos, Ferenc, Szabolcs, Zoltán, Szakály, Péter, Kalmár Nagy, Károly, Szederkényi, Edit, Auer, Brigitta, Deme, Orsolya, Egyed-Varga, Anita, Holtzinger, Emese, Vida-Mező, Anikó, Nacsa, János, Szilvási, Anikó, and Merkely, Béla

Published
2021
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22. Oxidative Stress and Cytotoxicity Induced by Co-Formulants of Glyphosate-Based Herbicides in Human Mononuclear White Blood Cells.

Author

Makame, Khadija Ramadhan, Masese, Sylvia Nyambeki, Ádám, Balázs, and Nagy, Károly

Subjects
LEUCOCYTES, CYTOTOXINS, OXIDATIVE stress, HERBICIDES, HERBICIDE application
Abstract

The use of genetically modified, glyphosate-resistant crops has led to the widespread application of glyphosate-based herbicides (GBHs), making them one of the most widely used herbicide formulations on the market. To enhance the efficacy of the active ingredient, GBHs used in practice often contain other ingredients marked as inert "adjuvants" or "co-formulants", the toxic properties of which are poorly understood. The objective of this study was to compare the cytotoxic effects of pure glyphosate, three GBHs (Roundup Mega, Fozat 480 and Glyfos) and two co-formulants commonly used in GBHs as assessed via CCK-8 assay, and the extent of their potential oxidative damage as assessed via superoxide dismutase (SOD) assay, in order to reveal the role of adjuvants in the toxicity of the formulations. Our results showed that glyphosate alone did not significantly affect cell viability. In contrast, GBHs and adjuvants induced a pronounced cytotoxic effect from a concentration of 100 μM. SOD activity of cells treated with GBHs or adjuvants was significantly lower compared to cells treated with glyphosate alone. This suggests that the adjuvants in GBHs are responsible for the cytotoxic effects of the formulations through the induction of oxidative stress. [ABSTRACT FROM AUTHOR]

Published
2023
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24. Ecological barriers mediate spatiotemporal shifts of bird communities at a continental scale

Author

Marjakangas, Emma-Liina, Bosco, Laura, Versluijs, Martijn, Xu, Yanjie, Santangeli, Andrea, Holopainen, Sari, Mäkeläinen, Sanna, Herrando, Sergi, Keller, Verena, Voříšek, Petr, Brotons, Lluís, Johnston, Alison, Princé, Karine, Willis, Stephen G, Aghababyan, Karen, Ajder, Vitalie, Balmer, Dawn E, Bino, Taulant, Boyla, Kerem Ali, Chodkiewicz, Tomasz, Del Moral, Juan Carlos, Mazal, Vlatka Dumbović, Ferrarini, Alessandro, Godinho, Carlos, Gustin, Marco, Kalyakin, Mikhail, Knaus, Peter, Kuzmenko, Tatiana, Lindström, Åke, Maxhuni, Qenan, Molina, Blas, Nagy, Károly, Radišić, Dimitrije, Rajkov, Saša, Rajković, Draženko Z, Raudoniki, Liutauras, Sjeničić, Jovica, Stoychev, Stoycho, Szép, Tibor, Teufelbauer, Norbert, Ursul, Silvia, van Turnhout, Chris A M, Velevski, Metodija, Vikstrøm, Thomas, Wilk, Tomasz, Voltzit, Olga, Øien, Ingar Jostein, Sudfeldt, Christoph, Gerlach, Bettina, Lehikoinen, Aleksi, University of St Andrews. Arctic Research Centre, and University of St Andrews. Statistics

Subjects
MCC, QL, GE, Distribution shift, Climate Change, Resistance, DAS, Birds - physiology, Biodiversity, QL Zoology, SDG 13 - Climate Action, Community composition, Animals, Macroecology, Ecosystem, Jaccard dissimilarity, Forecasting, GE Environmental Sciences
Abstract

Funding: This study was supported by the Swiss National Science Foundation (grant P2BEP3_195232) and by the Academy of Finland (project 323527 and project 329251). Species' range shifts and local extinctions caused by climate change lead to community composition changes. At large spatial scales, ecological barriers, such as biome boundaries, coastlines, and elevation, can influence a community's ability to shift in response to climate change. Yet, ecological barriers are rarely considered in climate change studies, potentially hindering predictions of biodiversity shifts. We used data from two consecutive European breeding bird atlases to calculate the geographic distance and direction between communities in the 1980s and their compositional best match in the 2010s and modeled their response to barriers. The ecological barriers affected both the distance and direction of bird community composition shifts, with coastlines and elevation having the strongest influence. Our results underscore the relevance of combining ecological barriers and community shift projections for identifying the forces hindering community adjustments under global change. Notably, due to (macro)ecological barriers, communities are not able to track their climatic niches, which may lead to drastic changes, and potential losses, in community compositions in the future. Publisher PDF

Published
2023

25. Ecological barriers mediate spatiotemporal shifts of bird communities at a continental scale

Author

Marjakangas, Emma-Liina, primary, Bosco, Laura, additional, Versluijs, Martijn, additional, Xu, Yanjie, additional, Santangeli, Andrea, additional, Holopainen, Sari, additional, Mäkeläinen, Sanna, additional, Herrando, Sergi, additional, Keller, Verena, additional, Voříšek, Petr, additional, Brotons, Lluís, additional, Johnston, Alison, additional, Princé, Karine, additional, Willis, Stephen G., additional, Aghababyan, Karen, additional, Ajder, Vitalie, additional, Balmer, Dawn E., additional, Bino, Taulant, additional, Boyla, Kerem Ali, additional, Chodkiewicz, Tomasz, additional, del Moral, Juan Carlos, additional, Mazal, Vlatka Dumbović, additional, Ferrarini, Alessandro, additional, Godinho, Carlos, additional, Gustin, Marco, additional, Kalyakin, Mikhail, additional, Knaus, Peter, additional, Kuzmenko, Tatiana, additional, Lindström, Åke, additional, Maxhuni, Qenan, additional, Molina, Blas, additional, Nagy, Károly, additional, Radišić, Dimitrije, additional, Rajkov, Saša, additional, Rajković, Draženko Z., additional, Raudoniki, Liutauras, additional, Sjeničić, Jovica, additional, Stoychev, Stoycho, additional, Szép, Tibor, additional, Teufelbauer, Norbert, additional, Ursul, Silvia, additional, van Turnhout, Chris A. M., additional, Velevski, Metodija, additional, Vikstrøm, Thomas, additional, Wilk, Tomasz, additional, Voltzit, Olga, additional, Øien, Ingar Jostein, additional, Sudfeldt, Christoph, additional, Gerlach, Bettina, additional, Shimmings, Paul, additional, and Lehikoinen, Aleksi, additional

Published
2023
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27. Optimal renal artery-aorta angulation revealed by flow simulation

Author

Csonka, David, primary, Kalmár Nagy, Károly, additional, Szakály, Péter, additional, Szukits, Sándor, additional, Bogner, Péter, additional, Koller, Akos, additional, Kun, Szilárd, additional, Wittmann, István, additional, Háber, István Ervin, additional, and Horváth, Iván Gabor, additional

Published
2023
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28. Genotoxicity of Occupational Pesticide Exposures among Agricultural Workers in Arab Countries : A Systematic Review and Meta-Analysis

Author

Sherif, Moustafa, Makame, Khadija Ramadhan, Östlundh, Linda, Paulo, Marilia Silva, Nemmar, Abderrahim, Ali, Bassam R., Al-Rifai, Rami H., Nagy, Károly, Ádám, Balázs, Sherif, Moustafa, Makame, Khadija Ramadhan, Östlundh, Linda, Paulo, Marilia Silva, Nemmar, Abderrahim, Ali, Bassam R., Al-Rifai, Rami H., Nagy, Károly, and Ádám, Balázs

Abstract

Exposure to pesticides in Arab countries is a significant public health concern due to extensive agricultural activity and pesticide use. This systematic review aimed to evaluate the genotoxic effects of agricultural pesticide exposure in the region, identify research gaps, and assess methodological limitations. Following the PRISMA guidelines, a comprehensive search yielded five relevant studies conducted in Egypt, Syria, and Jordan. Various genotoxicity assays were employed, revealing a higher level of DNA damage in exposed compared to non-exposed individuals. Farmers exposed to pesticides exhibited a significantly higher occurrence of chromosomal translocation (t(14;18)), micronuclei, and chromosomal aberrations. However, only two studies assessed cytotoxicity indirectly. The studies predominantly focused on male participants, with variations in sample size and pesticide types. The lack of detailed exposure data necessitates cautious interpretation. This review underscores the need for further research on the genotoxicity of occupational pesticide exposure in the Middle East. Future studies should adopt robust study designs, collect biological and environmental samples, conduct repeated sampling, analyze seasonal variations, and encompass diverse study sites associated with specific crop groups.

Published
2023
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35. Walsh-Marcinkiewicz means and Hardy spaces

Author

Nagy Károly and Tephnadze George

Subjects
42c10, walsh system, marcinkiewicz means, maximal operator, two-dimensional system, hardy space, strong convergence, modulus of continuity, Mathematics, QA1-939
Published
2014
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37. Some properties of the Walsh-Nörlund means.

Author

Goginava, Ushangi and Nagy, Károly

Subjects
INTEGRABLE functions, SUMMABILITY theory, MARTINGALES (Mathematics)
Abstract

In the present paper we give a necessary and sufficient condition on monotone weights, which guaranties the Nörlund means of Walsh-Fourier series converge in L1 norm and CW norm. We also discuss the almost everywhere summability by Nörlund means and we prove that our condition is sufficient for almost everywhere convergence of Nörlund means for all integrable functions. [ABSTRACT FROM AUTHOR]

Published
2023
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43. The future distribution of wetland birds breeding in Europe validated against observed changes in distribution

Author

Soultan, Alaaeldin, primary, Pavón-Jordán, Diego, additional, Bradter, Ute, additional, Sandercock, Brett K, additional, Hochachka, Wesley M, additional, Johnston, Alison, additional, Brommer, Jon, additional, Gaget, Elie, additional, Keller, Verena, additional, Knaus, Peter, additional, Aghababyan, Karen, additional, Maxhuni, Qenan, additional, Vintchevski, Alexandre, additional, Nagy, Károly, additional, Raudonikis, Liutauras, additional, Balmer, Dawn, additional, Noble, David, additional, Leitão, Domingos, additional, Øien, Ingar Jostein, additional, Shimmings, Paul, additional, Sultanov, Elchin, additional, Caffrey, Brian, additional, Boyla, Kerem, additional, Radišić, Dimitrije, additional, Lindström, Åke, additional, Velevski, Metodija, additional, Pladevall, Clara, additional, Brotons, Lluís, additional, Karel, Šťastný, additional, Rajković, Draženko Z, additional, Chodkiewicz, Tomasz, additional, Wilk, Tomasz, additional, Szép, Tibor, additional, van Turnhout, Chris, additional, Foppen, Ruud, additional, Burfield, Ian, additional, Vikstrøm, Thomas, additional, Mazal, Vlatka Dumbović, additional, Eaton, Mark, additional, Vorisek, Petr, additional, Lehikoinen, Aleksi, additional, Herrando, Sergi, additional, Kuzmenko, Tatiana, additional, Bauer, Hans-Günther, additional, Kalyakin, Mikhail V, additional, Voltzit, Olga V, additional, Sjeničić, Jovica, additional, and Pärt, Tomas, additional

Published
2022
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49. Micronucleus Formation Induced by Glyphosate and Glyphosate-Based Herbicides in Human Peripheral White Blood Cells

Author

Nagy, Károly, Argaw Tessema, Roba, Szász, István, Smeirat, Tamara, Al Rajo, Alaa, and Ádám, Balázs

Subjects
Herbicides, genotoxicity, Public Health, Environmental and Occupational Health, Glycine, formulation, Europe, glyphosate, Leukocytes, micronucleus, cytotoxicity, Humans, Public Health, GBHs, Original Research
Abstract

Glyphosate is the most commonly used herbicide around the world, which led to its accumulation in the environment and consequent ubiquitous human exposure. Glyphosate is marketed in numerous glyphosate-based herbicide formulations (GBHs) that include co-formulants to enhance herbicidal effect of the active ingredient, but are declared as inert substances. However, these other ingredients can have biologic activity on their own and may interact with the glyphosate in synergistic toxicity. In this study, we focused to compare the cytogenetic effect of the active ingredient glyphosate and three marketed GBHs (Roundup Mega, Fozat 480, and Glyfos) by investigating cytotoxicity with fluorescent co-labeling and WST-1 cell viability assay as well as genotoxicity with cytokinesis block micronucleus assay in isolated human mononuclear white blood cells. Glyphosate had no notable cytotoxic activity over the tested concentration range (0-10,000 μM), whereas all the selected GBHs induced significant cell death from 1,000 μM regardless of metabolic activation (S9). Micronucleus (MN) formation induced by glyphosate and its formulations at sub-cytotoxic concentrations (0-100 μM) exhibited a diverse pattern. Glyphosate caused statistically significant increase of MN frequency at the highest concentration (100 μM) after 20-h exposure. Contrarily, Roundup Mega exerted a significant genotoxic effect at 100 μM both after 4- and 20-h exposures; moreover, Glyfos and Fozat 480 also resulted in a statistically significant increase of MN frequency from the concentration of 10 μM after 4-h and 20-h treatment, respectively. The presence of S9 had no effect on MN formation induced by either glyphosate or GBHs. The differences observed in the cytotoxic and genotoxic pattern between the active principle and formulations confirm the previous concept that the presence of co-formulants in the formulations or the interaction of them with the active ingredient is responsible for the increased toxicity of herbicide products, and draw attention to the fact that GBHs are still currently in use, the toxicity of which rivals that of POEA-containing formulations (e.g., Glyfos) already banned in Europe. Hence, it is advisable to subject them to further comprehensive toxicological screening to assess the true health risks of exposed individuals, and to reconsider their free availability to any users.

Published
2021

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