Multiple Electronic and Structural Factors Control Cyclobutane Pyrimidine Dimer and 6-4 Thymine-Thymine Photodimerization in a DNA Duplex (921 views)
Chemistry (ISSN: 0947-6539, 1521-3765, 1521-3765electronic), 2017 Oct 26; 23(60): 15177-15188.
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Paper type: Journal Article,
Impact factor: 5.16, 5-year impact factor: 4.95
Url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85030644685&doi=10.1002%2fchem.201703237&partnerID=40&md5=c702cb561b050369dba9e3b92846995c
Keywords: 64-Pp, Dft Calculations, Photodimerization, Thymine, Aromatic Compounds, Charge Transfer, Excited States, Excitons, Charge Transfer State, Cyclobutane Pyrimidine Dimers, Electronic Excitation, Electronic Factors, Quantum Theory, Chemistry, Molecular Model, Thermodynamics, Ultraviolet Radiation,
Affiliations:
*** IBB - CNR ***
Dipartimento di Chimica Industriale "T. Montanari", Universita di Bologna, Viale Risorgimento 4, 40136, Bologna, Italy., Istituto di Biostrutture e Bioimmagini, CNR, Via Mezzocannone 16, 80134, Napoli, Italy., TU Wien, Zentraler Informatikdienst, Wiedner Hauptstrasse 8-10, 1040, Wien, Austria., Department of Physics, Michigan Technological University, 1400 Townsend Drive, Houghton, MI, 49331-1295, USA., LIDYL, CEA, CNRS, Universite Paris, Saclay, 91191, Gif-sur-Yvette, France.,
References:
Not available.
Chemistry (ISSN: 0947-6539, 1521-3765, 1521-3765electronic), 2017 Oct 26; 23(60): 15177-15188.
Export to BibTeX Export to EndNote
Paper type: Journal Article,
Impact factor: 5.16, 5-year impact factor: 4.95
Url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85030644685&doi=10.1002%2fchem.201703237&partnerID=40&md5=c702cb561b050369dba9e3b92846995c
Keywords: 64-Pp, Dft Calculations, Photodimerization, Thymine, Aromatic Compounds, Charge Transfer, Excited States, Excitons, Charge Transfer State, Cyclobutane Pyrimidine Dimers, Electronic Excitation, Electronic Factors, Quantum Theory, Chemistry, Molecular Model, Thermodynamics, Ultraviolet Radiation,
Affiliations:
*** IBB - CNR ***
Dipartimento di Chimica Industriale "T. Montanari", Universita di Bologna, Viale Risorgimento 4, 40136, Bologna, Italy., Istituto di Biostrutture e Bioimmagini, CNR, Via Mezzocannone 16, 80134, Napoli, Italy., TU Wien, Zentraler Informatikdienst, Wiedner Hauptstrasse 8-10, 1040, Wien, Austria., Department of Physics, Michigan Technological University, 1400 Townsend Drive, Houghton, MI, 49331-1295, USA., LIDYL, CEA, CNRS, Universite Paris, Saclay, 91191, Gif-sur-Yvette, France.,
References:
Not available.
Multiple Electronic and Structural Factors Control Cyclobutane Pyrimidine Dimer and 6-4 Thymine-Thymine Photodimerization in a DNA Duplex
The T–T photodimerization paths leading to the formation of cyclobutane pyrimidine dimer (CPD) and 6–4 pyrimidine pyrimidone (64-PP), the two main DNA photolesions, have been resolved for a T–T step in a DNA duplex by two complementary state-of-the-art quantum mechanical approaches: QM(CASPT2//CASSCF)/MM and TD-DFT/PCM. Based on the analysis of several different representative structures, we define a new-ensemble of cooperating geometrical and electronic factors (besides the distance between the reacting bonds) ruling T–T photodimerization in DNA. CPD is formed by a barrierless path on an exciton state delocalized over the two bases. Large interbase stacking and shift values, together with a small pseudorotation phase angle for T at the 3′-end, favor this reaction. The oxetane intermediate, leading to a 64-PP adduct, is formed on a singlet T→T charge-transfer state and is favored by a large interbase angle and slide values. A small energy barrier (<0.3 eV) is associated to this path, likely contributing to the smaller quantum yield observed for this process. Eventually, a clear directionality is always shown by the electronic excitation characterizing the singlet photoactive state driving the photodimerization process: an exciton that is more localized on T3 and a 5′-T→3′-T charge transfer for CPD and oxetane formation, respectively, thus calling for specific electronic constraints. © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
The T–T photodimerization paths leading to the formation of cyclobutane pyrimidine dimer (CPD) and 6–4 pyrimidine pyrimidone (64-PP), the two main DNA photolesions, have been resolved for a T–T step in a DNA duplex by two complementary state-of-the-art quantum mechanical approaches: QM(CASPT2//CASSCF)/MM and TD-DFT/PCM. Based on the analysis of several different representative structures, we define a new-ensemble of cooperating geometrical and electronic factors (besides the distance between the reacting bonds) ruling T–T photodimerization in DNA. CPD is formed by a barrierless path on an exciton state delocalized over the two bases. Large interbase stacking and shift values, together with a small pseudorotation phase angle for T at the 3′-end, favor this reaction. The oxetane intermediate, leading to a 64-PP adduct, is formed on a singlet T→T charge-transfer state and is favored by a large interbase angle and slide values. A small energy barrier (<0.3 eV) is associated to this path, likely contributing to the smaller quantum yield observed for this process. Eventually, a clear directionality is always shown by the electronic excitation characterizing the singlet photoactive state driving the photodimerization process: an exciton that is more localized on T3 and a 5′-T→3′-T charge transfer for CPD and oxetane formation, respectively, thus calling for specific electronic constraints. © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Multiple Electronic and Structural Factors Control Cyclobutane Pyrimidine Dimer and 6-4 Thymine-Thymine Photodimerization in a DNA Duplex
Multiple Electronic and Structural Factors Control Cyclobutane Pyrimidine Dimer and 6-4 Thymine-Thymine Photodimerization in a DNA Duplex
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* Ultrafast Dynamics of the Two Lowest Bright Excited States of Cytosine and 1-Methylcytosine: A Quantum Dynamical Study (47 views)
J Chem Theory Comput (ISSN: 1549-9618linking, 1549-9626electronic), 2020 Sep 8; 16(9): 5792-5808.
Impact Factor: 5.313
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Martinez-fernandez L, Gavvala K, Sharma R, Didier P, Richert L, Segarra Marti J, Mori M, Mely Y, Improta R
* Excited-State Dynamics of Thienoguanosine, an Isomorphic Highly Fluorescent Analogue of Guanosine (181 views)
Chemistry (ISSN: 0947-6539linking, 1521-3765electronic), 2019 May 28; 25(30): 7375-7386.
Impact Factor: 5.16
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Martinez-fernandez L, Improta R
* Sequence dependence on DNA photochemistry: a computational study of photodimerization pathways in TpdC and dCpT dinucleotides (334 views)
Photochemical & (ISSN: 1474-9092electronic, 1474-905xlinking), 2018 May 16; 17(5): 586-591.
Impact Factor: 2.939
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Diana D, Di Salvo C, Celentano V, De Rosa L, Romanelli A, Fattorusso R, D'Andrea LD
* Conformational stabilization of a beta-hairpin through a triazole-tryptophan interaction (381 views)
Org Biomol Chem (ISSN: 1477-0539electronic, 1477-0520linking), 2018 Jan 31; 16(5): 787-795.
Impact Factor: 3.451
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Martinez-fernandez L, Improta R
* Novel adenine/thymine photodimerization channels mapped by PCM/TD-DFT calculations on dApT and TpdA dinucleotides (423 views)
Photoch Photobio Sci (ISSN: 1474-905x), 2017 Jun 22; 16(8): 1277-1283.
Impact Factor: 2.902
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Pepino AJ, Segarra-marti J, Nenov A, Improta R, Garavelli M
* Resolving Ultrafast Photoinduced Deactivations in Water-Solvated Pyrimidine Nucleosides (329 views)
J Phys Chem Lett (ISSN: 1948-7185, 1948-7185electronic, 1948-7185linking), 2017 Apr 20; 8(8): 1777-1783.
Impact Factor: 8.709
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Martínez-fernández L, Granucci G, Pollum M, Crespo-hernández CE, Persico M, Corral I
* Decoding the Molecular Basis for the Population Mechanism of the Triplet Phototoxic Precursors in UVA Light-Activated Pyrimidine Anticancer Drugs (388 views)
Chemistry (ISSN: 0947-6539, 1521-3765, 1521-3765electronic), 2017; 23(11): 2619-2627.
Impact Factor: 5.16
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Martinez-fernandez L, Zhang Y, De La Harpe K, Beckstead AA, Kohler B, Improta R
* Photoinduced long-lived charge transfer excited states in AT-DNA strands (184 views)
Phys Chem Chem Phys (ISSN: 1463-9076, 1463-3907, 1463-9084electronic), 2016 Aug 21; 18(31): 21241-21245.
Impact Factor: 4.123
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Santoro AM, Cunsolo A, D'Urso A, Sbardella D, Tundo GR, Ciaccio C, Coletta M, Diana D, Fattorusso R, Persico M, Di Dato A, Fattorusso C, Milardi D, Purrello R
* Cationic porphyrins are tunable gatekeepers of the 20S proteasome (689 views) (PDF 233 views)
Chem Sci (ISSN: 2041-6520, 2041-6520linking, 2041-6520print), 2016; 7(2): 1286-1297.
Impact Factor: 8.668
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Improta R, Santoro F, Blancafort L
* Quantum Mechanical Studies on the Photophysics and the Photochemistry of Nucleic Acids and Nucleobases (1363 views)
Chem Rev (ISSN: 0009-2665), 2016; 116(6): 3540-3593.
Impact Factor: 47.928
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Zhang Y, de La Harpe K, Beckstead AA, Improta R, Kohler B
* UV-Induced Proton Transfer between DNA Strands (519 views) (PDF 243 views)
J Am Chem Soc (ISSN: 0002-7863, 0002-2786, 0002-7863print), 2015 Jun 10; 137(22): 7059-7062.
Impact Factor: 13.038
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Improta R, Barone V
* Excited States behavior of nucleobases in solution: insights from computational studies (214 views)
Top Curr Chem (ISSN: 0340-1022), 2015; 355: 329-357.
Impact Factor: 4.014
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Zhang Y, Dood J, Beckstead AA, Li X-B, Nguyen KV, Burrows CJ, Improta R, Kohler B
* Photoinduced Electron Transfer in DNA: Charge Shift Dynamics between 8-Oxo-Guanine Anion and Adenine (957 views)
J Phys Chem B (ISSN: 1520-6106, 1520-5207, 1520-5207linking), 2015; 119(24): 7491-7502.
Impact Factor: 3.187
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Huix-Rotllant M, Brazard J, Improta R, Burghardt I, Markovitsi D
* Stabilization of mixed frenkel-charge transfer excitons extended across both strands of guanine-cytosine DNA duplexes (526 views)
J Phys Chem Lett (ISSN: 1948-7185, 1948-7185electronic, 1948-7185linking), 2015; 6(12): 2247-2251.
Impact Factor: 8.539
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Fahleson T, Kauczor J, Norman P, Santoro F, Improta R, Coriani S
* TD-DFT investigation of the magnetic circular dichroism spectra of some purine and pyrimidine bases of nucleic acids (444 views)
J Phys Chem A (ISSN: 1089-5639, 1520-5215electronic, 1089-5639linking), 2015; 119(21): 5476-5489.
Impact Factor: 2.883
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Changenet-Barret P, Gustavsson T, Improta R, Markovitsi D
* Ultrafast Excited-State Deactivation of 8-Hydroxy-2′-deoxyguanosine Studied by Femtosecond Fluorescence Spectroscopy and Quantum-Chemical Calculations (560 views)
J Phys Chem A (ISSN: 1089-5639, 1520-5215electronic, 1089-5639linking), 2015; 119(23): 6131-6139.
Impact Factor: 2.883
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Zhang Y, Dood J, Beckstead AA, Li X-B, Nguyen KV, Burrows CJ, Improta R, Kohler B
* Efficient UV-induced charge separation and recombination in an 8-oxoguanine-containing dinucleotide (426 views)
P Natl Acad Sci Usa (ISSN: 0027-8424, 1091-6490, 0027-8424print), 2014 Sep 12; 111(32): 11612-11617.
Impact Factor: 9.674
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Improta R
* Quantum mechanical calculations unveil the structure and properties of the absorbing and emitting excited electronic states of guanine quadruplex (608 views)
Chemistry (ISSN: 0947-6539, 1521-3765, 1521-3765electronic), 2014 Jun 23; 20(26): 8106-8115.
Impact Factor: 5.731
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Santoro F, Improta R, Fahleson T, Kauczor J, Norman P, Coriani S
* Relative stability of the La and Lb excited states in adenine and guanine: Direct evidence from TD-DFT calculations of MCD spectra (303 views)
J Phys Chem Lett (ISSN: 1948-7185, 1948-7185electronic, 1948-7185linking), 2014 Jun 5; 5(11): 1806-1811.
Impact Factor: 7.458
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Roviello GN, Roviello GN, Musumeci D, Capasso D, Di Gaetano S, Costanzo M, Pedone C
* Synthesis and supramolecular assembly of 1, 3-bis(1 '-uracilyl)-2-propanone (427 views)
Rsc Adv (ISSN: 2046-2069, 2046-2069electronic), 2014; 4(54): 28691-28698.
Impact Factor: 3.84
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Banyasz A, Gustavsson T, Onidas D, Changenet-Barret P, Markovitsi D, Improta R
* Multi-pathway excited state relaxation of adenine oligomers in aqueous solution: A joint theoretical and experimental study (323 views)
Chemistry (ISSN: 0947-6539, 1521-3765, 1521-3765electronic), 2013 Mar; 19(11): 3762-3774.
Impact Factor: 5.696
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Santoro F, Improta R, Avila Ferrer FJ, Segado M, Lami A
* The interplay between neutral exciton and charge transfer states in single-strand polyadenine: A quantum dynamical investigation (455 views)
Photochem Photobiol Sci (ISSN: 1474-905x), 2013; 12(8): 1527-1543.
Impact Factor: 2.939
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Improta R
* Photophysics and photochemistry of thymine deoxy-dinucleotide in water: A PCM/TD-DFT quantum mechanical study (311 views)
J Phys Chem B (ISSN: 1520-6106, 1520-5207, 1520-5207electronic), 2012 Dec 13; 116(49): 14261-14274.
Impact Factor: 3.607
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Banyasz A, Douki T, Improta R, Gustavsson T, Onidas D, Vaya I, Perron M, Markovitsi D
* Electronic excited states responsible for dimer formation upon UV absorption directly by thymine strands: Joint experimental and theoretical study (372 views)
J Am Chem Soc (ISSN: 0002-7863, 0002-2786, 1520-5126), 2012 Sep 12; 134(36): 14834-14845.
Impact Factor: 10.677
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Hua Y, Changenet-Barret P, Improta R, Vaya I, Gustavsson T, Kotlyar AB, Zikich D, Sket P, Plavec J, Markovitsi D
* Cation effect on the electronic excited states of guanine nanostructures studied by time-resolved fluorescence spectroscopy (426 views)
J Phys Chem C (ISSN: 1932-7447), 2012 Jul 12; 116(27): 14682-14689.
Impact Factor: 4.814
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Biemann L, Kovalenko SA, Kleinermanns K, Mahrwald R, Markert M, Improta R
* Excited state proton transfer is not involved in the ultrafast deactivation of Guanine-cytosine pair in solution (424 views)
J Am Chem Soc (ISSN: 0002-7863, 0002-2786, 1520-5126), 2011 Dec 14; 133(49): 19664-19667.
Impact Factor: 9.907
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Improta R, Barone V
* Interplay between "neutral" and "charge-transfer" excimers rules the excited state decay in adenine-rich polynucleotides (662 views)
Angew Chem Int Ed (ISSN: 1433-7851, 1521-3773electronic, 1433-7851linking), 2011 Dec 9; 50(50): 12016-12019.
Impact Factor: 13.455
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Picconi D, Barone V, Lami A, Santoro F, Improta R
* The Interplay between ππ*/nπ* excited states in gas-phase thymine: A quantum dynamical study (299 views)
Chemphyschem (ISSN: 1439-4235, 1439-7641, 1439-7641electronic), 2011 Jul 11; 12(10): 1957-1968.
Impact Factor: 3.412
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Banyasz A, Karpati S, Mercier Y, Reguero M, Gustavsson T, Markovitsi D, Improta R
* The peculiar spectral properties of amino-substituted uracils: A combined theoretical and experimental study (375 views)
J Phys Chem B (ISSN: 1520-6106, 1520-5207, 1520-5207electronic), 2010 Oct 7; 114(39): 12708-12719.
Impact Factor: 3.603
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Changenet-Barret P, Emanuele E, Gustavsson T, Improta R, Kotlyar AB, Markovitsi D, Vaya I, Zakrzewska K, Zikich D
* Optical properties of guanine nanowires: Experimental and theoretical study (283 views)
J Phys Chem C (ISSN: 1932-7447), 2010 Sep 2; 114(34): 14339-14346.
Impact Factor: 4.524
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Gustavsson T, Improta R, Markovitsi D
DNA/RNA: Building blocks of life under UV irradiation (263 views)
J Phys Chem Lett (ISSN: 1948-7185, 1948-7185electronic, 1948-7185linking), 2010 Jul 1; 1(13): 2025-2030.
Impact Factor: 6.687
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Abbate M, Casella G, Fiore T, Grasso G, Pellerito C, Scopelliti M, Spinella A, Pellerito L
* Structural characterization of triorganotin(IV) complexes with sodium fusidate and DFT calculations (423 views)
J Organomet Chem (ISSN: 0022-328x), 2010 May 1; 695(9): 1405-1413.
Impact Factor: 2.205
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Improta R, Santoro F, Barone V, Lami A
* Vibronic model for the quantum dynamical study of the competition between bright and charge-transfer excited states in single-strand polynucleotides: the adenine dimer case (277 views)
J Phys Chem A (ISSN: 1089-5639, 1520-5215electronic, 1089-5639linking), 2009 Dec 31; 113(52): 15346-15354.
Impact Factor: 2.899
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Vitagliano L, Stanzione F, De Simone A, Esposito L
* Dynamics and Stability of Amyloid-Like Steric Zipper Assemblies with Hydrophobic Dry Interfaces (777 views)
Biopolymers (ISSN: 0006-3525, 0006-6352, 0006-3525print), 2009 Dec; 91(12): 1161-1171.
Impact Factor: 2.605
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Improta R, Barone V
* PCM/TD-DFT study of the two lowest excited states of uracil derivatives in solution: The effect of the functional and of the cavity model (232 views)
J Mol Struct Theochem (ISSN: 0166-1280), 2009 Nov 30; 914(1-3): 87-93.
Impact Factor: 1.216
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Karunakaran V, Kleinermanns K, Improta R, Kovalenko SA
* Photoinduced dynamics of guanosine monophosphate in water from broad-band transient absorption spectroscopy and quantum-chemical calculations (284 views)
J Am Chem Soc (ISSN: 0002-7863, 0002-2786, 1520-5126), 2009; 131(16): 5839-5850.
Impact Factor: 8.58
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Santoro F, Barone V, Improta R
* The Excited States Decay Of The A-T Dna: A Pcm/Td-Dft Study In Aqueous Solution Of The (9-Methyl-Adenine) 2 (1-Methyl-Thymine) 2 Stacked Tetramer (249 views)
J Am Chem Soc (ISSN: 0002-7863, 0002-2786, 1520-5126), 2009; 131(42): 15232-15245.
Impact Factor: 8.58
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Mercier Y, Santoro F, Reguero M, Improta R
* The decay from the dark nπ* excited state in uracil: An integrated CASPT2/CASSCF and PCM/TD-DFT study in the gas phase and in water (346 views)
J Phys Chem B (ISSN: 1520-6106, 1520-5207, 1520-5207electronic), 2008 Sep 4; 112(35): 10769-10772.
Impact Factor: 4.189
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Improta R, Barone V
The excited states of adenine and thymine nucleoside and nucleotide in aqueous solution: A comparative study by time-dependent DFT calculations (219 views)
Theor Chem Acc (ISSN: 1432-881x), 2008 Jul; 120(4-6): 491-497.
Impact Factor: 2.37
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Gustavsson T, Bányász A, Sarkar N, Markovitsi D, Improta R
* Assessing solvent effects on the singlet excited state lifetime of uracil derivatives: A femtosecond fluorescence upconversion study in alcohols and D2O (288 views)
Chem Phys (ISSN: 0301-0104), 2008 Jun 23; 350(1-3): 186-192.
Impact Factor: 1.961
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Gustavsson T, Banyasz A, Sarkar N, Markovitsi D, Improta R
* Statin: New life for an old drug (372 views)
Pharmacol Res Academic Press, 2008 Jun 23; 350(1-3): 1-2.
Impact Factor: 3.976
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Santoro F, Barone V, Improta R
* Can TD-DFT calculations accurately describe the excited states behavior of stacked nucleobases? The cytosine dimer as a test case (302 views)
J Comput Chem (ISSN: 0192-8651, 1096-987xelectronic, 0192-8651linking), 2008 Apr 30; 29(6): 957-964.
Impact Factor: 3.39
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Improta R
The Excited States Of Pi-Stacked 9-Methyl Adenine Oligomers: A Td-Dft Study In Aqueous Solution (182 views)
Physical Chemistry Chemical Physics, 2008; 10: 2656-2664.
Impact Factor: 2.028
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Santoro F, Barone V, Benzi C, Improta R
* Excited state properties of sizable molecules in solution: From structure to reactivity (274 views)
Theor Chem Acc (ISSN: 1432-881x), 2007 May; 117(5-6): 1073-1084.
Impact Factor: 2.537
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Santoro F, Barone V, Gustavsson T, Improta R
* Solvent effect on the singlet excited-state lifetimes of nucleic acid bases: A computational study of 5-fluorouracil and uracil in acetonitrile and water (873 views)
J Am Chem Soc (ISSN: 0002-7863, 0002-2786, 1520-5126), 2006 Dec 20; 128(50): 16312-16322.
Impact Factor: 7.696
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Barone V, Newton MD, Improta R
* Dissociative electron transfer in donor - Peptide - Acceptor systems: Results for kinetic parameters from a density functional/polarizable continuum model (269 views)
J Phys Chem B (ISSN: 1520-6106, 1520-5207, 1520-5207electronic), 2006 Jun 29; 110(25): 12632-12639.
Impact Factor: 4.115
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Improta R, Antonello S, Formaggio F, Maran F, Rega N, Barone V
* Understanding Electron Transfer across Negatively-Charged Aib Oligopeptides (667 views)
J Phys Chem B (ISSN: 1520-6106, 1520-5207, 1520-5207electronic), 2005 Jan 20; 109(2): 1023-1033.
Impact Factor: 4.033
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Caridi A, Cufari A, Lovino R, Palumbo R, Tedesco I
* Influence of Yeast on Polyphenol Composition of Wine (251 views)
Food Technol Biotechnol (ISSN: 1330-9862), 2004 Jan; 42(1): 37-40.
Impact Factor: 0.475
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Barone V, Formaggio F, Improta R, Polo F, Maran F
* Electron transfer to and conformational preferences of Aib oligo-peptides (418 views)
Proc Electrochem Soc, 2004; 10: 29-32.
Impact Factor: 0
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Saracino GAA, Tedeschi A, D'Errico G, Improta R, Franco L, Ruzzi M, Corvaia C, Barone V
* Solvent polarity and pH effects on the magnetic properties of ionizable nitroxide radicals: A combined computational and experimental study of 2, 2, 5, 5-tetramethyl-3-carboxypyrrolidine and 2, 2, 6, 6-tetramethyl-4-carboxypiperidine nitroxides (317 views)
J Phys Chem A (ISSN: 1089-5639, 1520-5215electronic, 1089-5639linking), 2002; 106(44): 10700-10706.
Impact Factor: 2.765
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Crisma M, Formaggio F, Valle G, Toniolo C, Saviano M, Iacovino R, Zaccaro L, Benedetti E
Experimental evidence at atomic resolution for intramolecular N- H···π (phenyl) interactions in a family of amino acid derivatives (436 views)
Biopolymers (ISSN: 0006-3525, 0006-6352, 0006-3525print), 1997; 42(1): 1-6.
Impact Factor: 2.425
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53 Records (53 excluding Abstracts).
Total impact factor: 302.613 (302.613 excluding Abstracts).
Total 5 year impact factor: 311.048 (311.048 excluding Abstracts).
Total impact factor: 302.613 (302.613 excluding Abstracts).
Total 5 year impact factor: 311.048 (311.048 excluding Abstracts).
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