Zmień swoje zdjęcie w tle Prześlij Zmień swoje zdjęcie w tlePrześlij Zmień swoje zdjęcie w tle Tomasz Pańczyk prof. dr hab.•tomasz.panczyk@ikifp.edu.pl•+48 81 537 5620•kierownik grupy badawczej•622, Collegium Chemicum, UMCS, Lublin•Adsorpcja Status konta użytkownika to Approved prof. dr hab.•tomasz.panczyk@ikifp.edu.pl•+48 81 537 5620•kierownik grupy badawczej•622, Collegium Chemicum, UMCS, Lublin•Adsorpcja Profil Profil Tematyka badawcza Tematyka badawcza Metodyka Metodyka Publikacje Publikacje Patenty Patenty S. Bujok, T. Pańczyk, K. Szutkowski, D. Aniol, S. Antropov, K. Kruczała, Ł. Bratasz, Migration of phthalate plasticisers in heritage objects made of poly(vinyl chloride): Mechanical and environmental aspects, Journal of Environmental Management 375 (2025-01-23) 124234. T. Panczyk, P. Wolski, K. Nieszporek, R.. Pietrzak, Adsorption of Methylene Blue on Activated Carbon Surfaces Obtained by Shock Compression of Graphite Using Reactive Molecular Dynamics, Molecules 29 (2024-12-21) 6030. B. Jachimska, M. Goncerz, P. Wolski, C. Meldrum, L. Lustyk, T. Panczyk, Theoretical and Experimental Analyses of the Interfacial Mechanism of Dendrimer–Doxorubicin Complexes Formation, Molecular Pharmaceutics 21 (2024-10-22) 5892-5904. P. Obara, P. Wolski, T. Panczyk, Insights into the Molecular Structure, Stability, and Biological Significance of Non-Canonical DNA Forms, with a Focus on G-Quadruplexes and i-Motifs, Molecules 29 (2024-10-02) 4683. P. Wolski, T. Panczyk, Insight Into Interfacial Behaviors between Doxorubicin and Zwitterion/PAMAM/CQD Hybrid Nanocarrier. A Molecular Dynamics Simulations Study, The Journal of Physical Chemistry B ACS 128 (2024-09-04) 8946-8955. J. Nieszporek, T. Panczyk, K. Nieszporek, The Comparison of Catalytic Activity of Carbimazole and Methimazole on Electroreduction of Zinc (II) in Chlorates (VII): Experimental and Molecular Modelling Study, Molecules MDPI 29 (2024-07-23) 3455. T. Panczyk, K. Nieszporek, P. Wolski, Modeling the degradation of polypropylene and polystyrene under shock compression and mechanical cleaving using the ReaxFF force field, Chemosphere 357 (2024-04-22) 142056. T. Panczyk, K. Nieszporek, P. Wolski, Surface chemistry of degraded polyethylene terephthalate (PET): Insights from reactive molecular dynamics study, Applied Surface Science 654 (2024-01-30) 159493. T. Panczyk, K. Nieszporek, Formation of degraded LDPE surfaces using mechanical cleavage and shock compression analyzed by means of molecular dynamics simulations, Computational Materials Science 230 (2023-09-22) 112522. P. Wolski, T. Panczyk, A. Brzyska, Molecular Dynamics Simulations of Carbon Quantum Dots/Polyamidoamine Dendrimer Nanocomposites, The Journal of Chemical Chemistry C 127 (2023-08-14) 16740-16750. T. Panczyk, W. Plazinski, F. Dupradeau, A. Brzyska, P. Wolski, Interaction of Chondroitin and Hyaluronan Glycosaminoglycans with Surfaces of Carboxylated Carbon Nanotubes Studied Using Molecular Dynamics Simulations, Molecules 28 (2023-01-13) 826. M. Szota, P. Wolski, C. Carucci, F. Cesare Marincola, J. Gurgul, T. Pańczyk, A. Salis, B. Jachimska, Effect of Ionization Degree of Poly(amidoamine) Dendrimer and 5-Fluorouracil on the Efficiency of Complex Formation—A Theoretical and Experimental Approach, International Journal of Molecular Sciences 24 (2023-01-03) 819. T. Pańczyk, J. Nieszporek, K. Nieszporek, Molecular Dynamics Simulations of Interactions between Human Telomeric i-Motif Deoxyribonucleic Acid and Functionalized Graphene, Journal of Physical Chemistry B 126 (2022-08-29) 6671-6681. T. Panczyk, K. Nieszporek, P. Wolski, Stability and Existence of Noncanonical I-motif DNA Structures in Computer Simulations Based on Atomistic and Coarse-Grained Force Fields, Molecules MDPI 27 (2022-08-01) 4915. P. Wolski, K. Nieszporek, T. Panczyk, Regulation of water access, storage, separation and release of drugs from the carbon nanotube functionalized by cytosine rich DNA fragments, Biomaterials Advances 137 (2022-05-02) 212835. C.K. Lee, S. Zhang, G. Venkatesan, N. Irsan, S.Y. Chong, J.-W. Wang, W.J. Goh, T. Panczyk, Y.Z. Tay, J. Hu, W.K. Ng, M.G. Wacker, W.S. Toh, G. Pastorin, Enhanced skin penetration of berberine from proniosome gel attenuates pain and inflammation in a mouse model of osteoarthritis, Biomaterials Science 10 (2022-02-17) 1752-1764. T. Panczyk, W. Plazinski, A. Brzyska, P. Wolski, Adsorption of hyaluronan saccharides on the surface of a single walled carbon nanotube. A computational study, Applied Surface Science ELSEVIER 584 (2022-01-25) 152599. T. Pańczyk, P. Wolski, P. Wojton, Molecular dynamics study of the interaction of carbon nanotubes with telomeric DNA fragment containing noncanonical G-quadruplex and I-motif forms, International Journal of Molecular Sciences 21 (2020-01-01) 1925. P. Wolski, K. Nieszporek, T. Pańczyk, Carbon nanotubes and short cytosine-rich telomeric DNA oligomeres as platforms for controlled release of doxorubicin—a molecular dynamics study, International Journal of Molecular Sciences 21 (2020-01-01) 3619. A. Jagusiak, K. Chlopas, G. Zemanek, P. Wolski, T. Pańczyk, Controlled release of doxorubicin from the drug delivery formulation composed of single-walled carbon nanotubes and congo red: A molecular dynamics study and dynamic light scattering analysis, Pharmaceutics 12 (2020-01-01) 1-21. P. Wolski, P. Wojton, K. Nieszporek, T. Pańczyk, Interaction of Human Telomeric i-Motif DNA with Single-Walled Carbon Nanotubes: Insights from Molecular Dynamics Simulations, Journal of Physical Chemistry B 123 (2019-01-01) 10343-10353. P. Wolski, T. Pańczyk, Conformational Properties of PAMAM Dendrimers Adsorbed on the Gold Surface Studied by Molecular Dynamics Simulation, Journal of Physical Chemistry C 123 (2019-01-01) 22603-22613. T. Pańczyk, P. Wojton, P. Wolski, Mechanism of unfolding and relative stabilities of G-quadruplex and I-motif noncanonical DNA structures analyzed in biased molecular dynamics simulations, Biophysical Chemistry 250 (2019-01-01) 106173. A. Jagusiak, K. Chłopaś, G. Zemanek, M. Jemioła-Rzemińska, B. Piekarska, B. Stopa, T. Pańczyk, Self-assembled supramolecular ribbon-like structures complexed to single walled carbon nanotubes as possible anticancer drug delivery systems, International Journal of Molecular Sciences 20 (2019-01-01) 2064. A. Jagusiak, T. Pańczyk, Interaction of Congo Red, Evans Blue and Titan Yellow with doxorubicin in aqueous solutions. A molecular dynamics study, Journal of Molecular Liquids 279 (2019-01-01) 640-648. P. Wolski, K. Nieszporek, T. Pańczyk, G-Quadruplex and I-Motif Structures within the Telomeric DNA Duplex. A Molecular Dynamics Analysis of Protonation States as Factors Affecting Their Stability, Journal of Physical Chemistry B 123 (2019-01-01) 468-479. T. Pańczyk, L. Konczak, P. Wolski, Colloid Nanoparticles and Carbon Nanotubes. What Can We Learn About Their Biomedical Application From Molecular Dynamics Simulations?, Mod. Probl. Mol. Phys. Springer International PublishingCham (2018-01-01) 23–37. P. Wolski, K. Nieszporek, T. Pańczyk, Multimodal, pH Sensitive, and Magnetically Assisted Carrier of Doxorubicin Designed and Analyzed by Means of Computer Simulations, Langmuir 34 (2018-01-01) 2543–2550. T. Pańczyk, P. Wolski, Molecular dynamics analysis of stabilities of the telomeric Watson-Crick duplex and the associated i-motif as a function of pH and temperature, Biophys. Chem. 237 (2018-01-01) 22–30. K. Nieszporek, T. Pańczyk, J. Nieszporek, The inhibition effect of water on the purification of natural gas with nanoporous graphene membranes, Beilstein J. Nanotechnol 9 (2018-01-01) 1906–1916. J. Goclon, T. Pańczyk, K. Winkler, Investigation of the interfacial properties of polyurethane/carbon nanotube hybrid composites: A molecular dynamics study, Appl. Surf. Sci. 433 (2018-01-01) 213–221. P. Wolski, T. Pańczyk, Teoretyczne badanie adsorpcji doxorubicyny i wybranych cząsteczek barwników na powierzchni jednościennych nanorurek węglowych, Nowe trendy w fizykochemicznych badaniach granic faz Polskie Towarzystwo ChemiczneLublin (2018-01-01) 123-140. A. Jagusiak, B. Piekarska, T. Pańczyk, M. Jemiola-Rzeminska, E. Bielanska, B. Stopa, G. Zemanek, J. Rybarska, I. Roterman, L. Konieczny, Dispersion of single-wall carbon nanotubes with supramolecular congo red-properties of the complexes and mechanism of the interaction, Beilstein Journal of Nanotechnology 8 (2017-01-01) 636-648. P. Wolski, K. Nieszporek, T. Pańczyk, Pegylated and folic acid functionalized carbon nanotubes as pH controlled carriers of doxorubicin. Molecular dynamics analysis of the stability and drug release mechanism, Physical Chemistry Chemical Physics 19 (2017-01-01) 9300-9312. P. Wolski, J. Narkiewicz-Michalek, M. Panczyk, G. Pastorin, T. Pańczyk, Molecular Dynamics Modeling of the Encapsulation and De-encapsulation of the Carmustine Anticancer Drug in the Inner Volume of a Carbon Nanotube, Journal of Physical Chemistry C 121 (2017-01-01) 18922-18934. T. Pańczyk, L. Konczak, J. Narkiewicz-Michalek, G. Pastorin, Corking and Uncorking Carbon Nanotubes by Metal Nanoparticles Bearing pH-Cleavable Hydrazone Linkers. Theoretical Analysis Based on Molecular Dynamics Simulations, Journal of Physical Chemistry C 120 (2016-01-01) 639-649. T. Pańczyk, P. Wolski, L. Lajtar, Coadsorption of Doxorubicin and Selected Dyes on Carbon Nanotubes. Theoretical Investigation of Potential Application as a pH-Controlled Drug Delivery System, Langmuir 32 (2016-01-01) 4719-4728. A. Jagusiak, B. Piekarska, K. Chłopaś, E. Bielanska, T. Pańczyk, Shortening and dispersion of single-walled carbon nanotubes upon interaction with mixed supramolecular compounds, Bio-Algorithms and Med-Systems 12 (2016-01-01) 123-132. L. Konczak, J. Narkiewicz-Michalek, G. Pastorin, T. Pańczyk, Effects of intermolecular interactions on the stability of carbon nanotube–gold nanoparticle conjugates in solution, International Journal of Nanomedicine 11 (2016-01-01) 5837-5849. J. Li, S.L. Yoong, W.J. Goh, B. Czarny, Z. Yang, K. Poddar, M.M. Dykas, A. Patra, T. Venkatesan, T. Pańczyk, C. Lee, G. Pastorin, In vitro controlled release of cisplatin from gold-carbon nanobottles via cleavable linkages, International Journal of Nanomedicine 10 (2015-01-01) 7425-7441. T. Pańczyk, P. Wolski, L. Konczak, J. Narkiewicz-Michalek, Sidewall functionalization of carbon nanotubes as a method of controlling structural transformations of the magnetically triggered nanocontainer: A molecular dynamics study, Journal of Physical Chemistry C 119 (2015-01-01) 8373-8381. T. Pańczyk, L. Konczak, S. Zapotoczny, P. Szabelski, M. Nowakowska, Molecular dynamics simulations of proton transverse relaxation times in suspensions of magnetic nanoparticles, Journal of Colloid and Interface Science 437 (2015-01-01) 187-196. T. Pańczyk, T. Da Ros, G. Pastorin, A. Jagusiak, J. Narkiewicz-Michalek, Role of intermolecular interactions in assemblies of nanocontainers composed of carbon nanotubes and magnetic nanoparticles: A molecular dynamics study, Journal of Physical Chemistry C 118 (2014-01-01) 1353-1363. J. Li, A. Pant, C.F. Chin, W.H. Ang, C. Ménard-Moyon, T.R. Nayak, D. Gibson, S. Ramaprabhu, T. Pańczyk, A. Bianco, G. Pastorin, In vivo biodistribution of platinum-based drugs encapsulated into multi-walled carbon nanotubes, Nanomedicine: Nanotechnology, Biology, and Medicine 10 (2014-01-01) 1465-1475. T. Pańczyk, P. Wolski, A. Jagusiak, M. Drach, Molecular dynamics study of Congo red interaction with carbon nanotubes, RSC Advances 4 (2014-01-01) 47304-47312. T. Pańczyk, W. Rudzinski, Effects of surface heterogeneity of carbon nanotubes in adsorption of colloid nanoparticles studied by means of computer simulations, Adsorption 19 (2013-01-01) 611-618. T. Pańczyk, A. Jagusiak, G. Pastorin, W. H. Ang, J. Narkiewicz- Michalek, Molecular dynamics study of cisplatin release from carbon nanotubes capped by magnetic nanoparticles, Journal of Physical Chemistry C 117 (2013-01-01) 17327-17336. B. S. Wong, S. L. Yoong, A. Jagusiak, T. Pańczyk, H. K. Ho, W. H. Ang, G. Pastorin, Carbon nanotubes for delivery of small molecule drugs, Advanced Drug Delivery Reviews 65 (2013-01-01) 1964-2015. P. Szabelski, W. Rzysko, T. Pańczyk, E. Ghijsens, K. Tahara, Y. Tobe, S. De Feyter, Self-assembly of molecular tripods in two dimensions: Structure and thermodynamics from computer simulations, RSC Advances 3 (2013-01-01) 25159-25165. T. Pańczyk, W. Rudzinski, A. Jagusiak, Adsorption of colloid nanoparticles on carbon nanotubes studied by means of molecular dynamics simulations, Colloids and Surfaces A: Physicochemical and Engineering Aspects 409 (2012-01-01) 149-158. J. Li, S.Q. Yap, S.L. Yoong, T.R. Nayak, G. W. Chandra, W.H. Ang, T. Pańczyk, S. Ramaprabhu, S.K. Vashist, F.-S. Sheu, A. Tan, G. Pastorin, Carbon nanotube bottles for incorporation, release and enhanced cytotoxic effect of cisplatin, Carbon 50 (2012-01-01) 1625-1634. T. Pańczyk, P. Szabelski, M. Drach, Implicit solvent model for effective molecular dynamics simulations of systems composed of colloid nanoparticles and carbon nanotubes, Journal of Colloid and Interface Science 383 (2012-01-01) 55-62. T. Pańczyk, M. Drach, P. Szabelski, A. Jagusiak, Magnetic Anisotropy Effects on the Behavior of a Carbon Nanotube Functionalized by Magnetic Nanoparticles Under External Magnetic Fields, Journal of Physical Chemistry C 116 (2012-01-01) 26091-26101. T. Pańczyk, T. P. Warzocha, P. J. Camp, Enhancing the control of a magnetically capped molecular nanocontainer: Monte Carlo studies, Journal of Physical Chemistry C 115 (2011-01-01) 7928-7938. T. Pańczyk, P.J. Camp, G. Pastorin, T.P. Warzocha, Computational Study of Some Aspects of Chemical Optimization of a Functional Magnetically Triggered Nanocontainer, Journal of Physical Chemistry C 115 (2011-01-01) 19074-19083. P. Szabelski, T. P. Warzocha, T. Pańczyk, Thermal desorption of chiral molecules from a nanostructured chiral surface: Insights from computer simulations, Thermochimica Acta 497 (2010-01-01) 77-84. T. Pańczyk, V. Fiorin, T. P. Warzocha, Influence of the rotational degrees of freedom on the initial sticking probability of water on Pt {110 }-(1×2): A molecular dynamics study, Journal of Chemical Physics 133 (2010-01-01) 034708. T. Pańczyk, T. P. Warzocha, P. J. Camp, A Magnetically Controlled Molecular Nanocontainer as a Drug Delivery System: The Effects of Carbon Nanotube and Magnetic Nanoparticle Parameters from Monte Carlo Simulations, Journal of Physical Chemistry C 114 (2010-01-01) 21299–21308. T. P. Warzocha, T. Pańczyk, P.J. Camp, Nanocapsule composed of carbon nanotube and magnetic nanoparticles. Monte Carlo studies of its potential use as a drug delivery system, Science and Supercomputing in Europe HPC-Europa2http://www.hpc-europa.eu/?q=node/119 58 (2010-01-01) 58. T. Pańczyk, V. Fiorin, R. Blanco-Alemany, D.A. King, Dynamics of Water Adsorption on Pt {110} - (1×2): a Molecular Dynamics Study, J. Chem. Phys. 131 (2009-01-01) 064703. T. Pańczyk, T.P. Warzocha, Monte Carlo Study of the Properties of a Carbon Nanotube Functionalized by Magnetic Nanoparticles, J. Phys. Chem. C 113 (2009-01-01) 19155-19160. T. Pańczyk, T.P. Warzocha, P. Szabelski, W. Rudzinski, Kinetic Adsorption Energy Distributions of Rough Surfaces: a Computational Study, Langmuir 24 (2008-01-01) 8719-8725. P. Szabelski, T. Pańczyk, M. Drach, Monte Carlo Modeling of Chiral Adsorption on Nanostructured Chiral Surfaces and Slit Pores, Langmuir 24 (2008-01-01) 12972-12980. T. Pańczyk, T.P. Warzocha, W. Rudzinski, Studies of the Collision Frequency of Ideal Gas Particles with the Surfaces of the Objects Created Using the Ballistic Deposition Technique, Appl. Surf. Sci. 254 (2008-01-01) 2285-2291. T. Pańczyk, Collisions of Ideal Gas Molecules with a Rough/fractal Surface. A Computational Study, J. Phys. Chem. C 111 (2007-01-01) 3175-3184. P. Szabelski, T. Pańczyk, Computer Modeling of Dissociative Gas Adsorption on Laser-roughened Surfaces, Appl. Surf. Sci. 253 (2007-01-01) 5622-5627. T. Pańczyk, T. Warzocha, W. Rudzinski, Molecular Dynamics Study of the Equilibrium Flux of Gas Molecules to a Fractal/rough Surface. Effects of Gas Atom Diameter, Appl. Surf. Sci. 253 (2007-01-01) 5846-5850. T. Pańczyk, W. Gac, M. Panczyk, T. Borowiecki, W. Rudzinski, On the Equilibrium Nature of Thermodesorption Processes. TPD-NH3 Studies f Surface Acidity f Ni/MgO-Al2O3 Catalysts, Langmuir 22 (2006-01-01) 6613-6621. T. Pańczyk, Sticking Coefficient and Pressure Dependence of Desorption rate in the Statistical Rate Theory Approach to the Kinetics of Gas Adsorption. Carbon Monoxide Adsorption/Desorption Rates on the Polycrystalline Rhodium Surface, Phys. Chem. Chem. Phys. 8 (2006-01-01) 3782-3795. T. Pańczyk, P. Szabelski, W. Rudzinski, Hydrogen Adsorption on Nickel (100) Single Crystal Face. A Monte Carlo Study of The Equilibrium and Kinetics, J. Phys. Chem. B 109 (2005-01-01) 10986-10994. W. Rudzinski, T. Pańczyk, W. Płaziński, Kinetics of Isothermal Gas Adsorption on Heterogeneous Solid Surfaces: Equations Based on Generalization of the Statistical Rate Theory of Interfacial Transport, J. Phys. Chem. B 109 (2005-01-01) 21868-21878. T. Pańczyk, F. Villieras, Monte Carlo Simulations of Controlled Rate Thermal Analysis Spectra - The Influence of Surface Energetic Heterogeneity and Lateral Interactions between Adsorbed Molecules, Appl. Surf. Sci. 239 (2005-01-01) 353-366. T. Pańczyk, W. Rudzinski, On the Ways of Generalization of Adsorption Kinetic Equations for the Case of Energetically Heterogeneous Surfaces, Appl. Surf. Sci. 252 (2005-01-01) 678-686. T. Pańczyk, The Influence of a Small Amount of Active Sites on the Adsorption Kinetics of Nitrogen on Ruthenium, Appl Surf. Sci. 252 (2005-01-01) 687-698. P. Szabelski, T. Pańczyk, W. Rudzinski, Theoretical Study of the Influence of Laser-induced Defects on the Adsorption of Gases on Solid Surfaces, Appl. Surf. Sci. 252 (2005-01-01) 582-590. T. Pańczyk, W. Gac, M. Panczyk, A. Dominko, T. Borowiecki, W. Rudzinski, Thermodesorption Studies of Energetic Properties of Ni/MgO-Al2O3 Catalysts. Determination of Adsorption Energy Distribution Functions, Langmuir 21 (2005-01-01) 7311-7320. T. Pańczyk, F. Villieras, W. Rudzinski, M. Pelletier, A. Razafitianatiaharavo, A Quantitative Study of Solid Surface Heterogeneity Based on the Statistical Rate Theory to Analyze Spectra of Controlled-Rate Thermal Analysis, Phys. Chem. Chem. Phys. 6 (2004-01-01) 3684-3693. T. Pańczyk, W. Rudzinski, A Statistical Rate Theory Approach to Kinetics of Dissociative Gas Adsorption on Solids, J. Phys. Chem. B 108 (2004-01-01) 2898-2909. T. Pańczyk, Application of the Statistical Rate Theory to the Computer Simulations of Adsorption Kinetics, Appl. Surf. Sci. 222 (2004-01-01) 307-321. T. Pańczyk, W. Rudzinski, Kinetics of Dissociative Hydrogen Adsorption on the (100) Nickel Single Crystal Face: A Statistical Rate Theory Approach, Appl. Surf. Sci. 233 (2004-01-01) 141-154. T. Pańczyk, W. Rudzinski, Kinetics of gas adsorption on strongly heterogeneous solid surfaces: A Statistical Rate Theory Approach, Korean J. Chem. Eng. 21 (2004-01-01) 206-211. T. Pańczyk, W. Rudzinski, Monte Carlo Modeling of Adsorption Equilibrium and Kinetics in the System H2/Ni(100), Ann. Polish Chem. Soc. 3 (2004-01-01) 571-574. T. Pańczyk, W. Rudzinski, A Simultaneous Description of Kinetics and Equilibria of Adsorption on Heterogenous Solid Surfaces Based on the Statistical Rate Theory of Interfacial Transport, Langmuir 19 (2003-01-01) 1173-1181. T. Pańczyk, P. Szabelski, The Influence of Lateral Interactions between Adsorbed Molecules on Adsorption Kinetics. A Statistical Rate Theory Approach, J. Phys. Chem. B 107 (2003-01-01) 5586-5597. T. Pańczyk, W. Rudzinski, Kinetics of Multi-Site-Occupancy Adsorption on Heterogeneous Solid Surfaces: A Statistical Rate Theory Approach, J. Phys. Chem. B 106 (2002-01-01) 7846-7851. W. Rudzinski, T. Pańczyk, Remarks on the Current State of Adsorption Kinetic Theories for Heterogeneous Solid Surfaces: a Comparison of the ART and the SRT Approaches, Langmuir 18 (2002-01-01) 439-449. W. Rudzinski, T. Pańczyk, The Langmuirian Adsorption Kinetics Revised: a Farewell to the XX-th Century Theories?, Adsorption 8 (2002-01-01) 23-24. T. Pańczyk, W. Rudzinski, T. Borowiecki, A. Dominko, The Procedure for Evaluating the Adsorption Energy Distribution from the Analysis of Thermodesorption Spectra Based on the Statistical Rate Theory, Adsorption Sci. Technol. 20 (2002-01-01) 381-391. P. Szabelski, T. Pańczyk, W. Rudzinski, Thermal Desorption from Surfaces with Laser-Induced Deffects, Appl. Surf. Sci. 202 (2002-01-01) 232-240. Dodaj publikację