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Pregled bibliografske jedinice broj: 936

Radiation energy transfer and trapping in single crystals of hemihydrate and hydrochloride of 5-methylcytosine doped with 5-methylcytosine - An EPR study


Herak, Janko Nikola; Sanković, Krešimir; Krilov, Dubravka; Jakšić, Milko; Huettermann, Juergen
Radiation energy transfer and trapping in single crystals of hemihydrate and hydrochloride of 5-methylcytosine doped with 5-methylcytosine - An EPR study // Radiation physics and chemistry, 50 (1997), 2; 141-148 doi:10.1016/S0969-806X(97)00027-3 (međunarodna recenzija, članak, znanstveni)


CROSBI ID: 936 Za ispravke kontaktirajte CROSBI podršku putem web obrasca

Naslov
Radiation energy transfer and trapping in single crystals of hemihydrate and hydrochloride of 5-methylcytosine doped with 5-methylcytosine - An EPR study

Autori
Herak, Janko Nikola ; Sanković, Krešimir ; Krilov, Dubravka ; Jakšić, Milko ; Huettermann, Juergen

Izvornik
Radiation physics and chemistry (0146-5724) 50 (1997), 2; 141-148

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
EPR ; 5-Methylthiocytosine ; Radiation damage ; Sulphur-centered radicals ; Transfer of radiation energy

Sažetak
Two different crystals of 5-methylcytosine with 5-methylthiocytosine as impurity, irradiated with ionising radiation, exhibit quite different types of paramagnetic centres associated with thio impurities. In 5-methylcytosine hemihydrate there are two types of radicals with the unpaired spin located mainly on sulphur. Both are of thiyl structure, presumably derived by a loss of an electron from 5-methylthiocytosine. In doped 5-methylcytosine hydrochloride two distinct paramagnetic species with high spin density on chlorine have been detected. One of them has been spectroscopically characterised and assigned to an electron-deficient species with the unpaired electron shared by a sulphur and a chlorine atom, with some delocalization over the pyrimidine ring. Both crystal lattices of 5-methylcytosine support migration of electrons/holes. In the hemihydrate lattice, the base stacking interaction, although weak in comparison to that in DNA or some other molecular crystals of the nucleic-acid bases, might be responsible for that. In the dihydrochloride lattice, the chlorine-ion strings or layers might provide the means for the hole transport. Both neutral and positively charged 5-methylthiocytosine is a good radiation energy trap (hole trap).

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekti:
00980206
006110

Ustanove:
Farmaceutsko-biokemijski fakultet, Zagreb,
Institut "Ruđer Bošković", Zagreb,
Medicinski fakultet, Zagreb

Profili:

Avatar Url Milko Jakšić (autor)

Avatar Url Janko Herak (autor)

Avatar Url Dubravka Krilov (autor)

Avatar Url Krešimir Sanković (autor)

Citiraj ovu publikaciju

Herak, Janko Nikola; Sanković, Krešimir; Krilov, Dubravka; Jakšić, Milko; Huettermann, Juergen
Radiation energy transfer and trapping in single crystals of hemihydrate and hydrochloride of 5-methylcytosine doped with 5-methylcytosine - An EPR study // Radiation physics and chemistry, 50 (1997), 2; 141-148 doi:10.1016/S0969-806X(97)00027-3 (međunarodna recenzija, članak, znanstveni)
Herak, J., Sanković, K., Krilov, D., Jakšić, M. & Huettermann, J. (1997) Radiation energy transfer and trapping in single crystals of hemihydrate and hydrochloride of 5-methylcytosine doped with 5-methylcytosine - An EPR study. Radiation physics and chemistry, 50 (2), 141-148 doi:10.1016/S0969-806X(97)00027-3.
@article{article, year = {1997}, pages = {141-148}, DOI = {10.1016/S0969-806X(97)00027-3}, keywords = {EPR, 5-Methylthiocytosine, Radiation damage, Sulphur-centered radicals, Transfer of radiation energy}, journal = {Radiation physics and chemistry}, doi = {10.1016/S0969-806X(97)00027-3}, volume = {50}, number = {2}, issn = {0146-5724}, title = {Radiation energy transfer and trapping in single crystals of hemihydrate and hydrochloride of 5-methylcytosine doped with 5-methylcytosine - An EPR study}, keyword = {EPR, 5-Methylthiocytosine, Radiation damage, Sulphur-centered radicals, Transfer of radiation energy} }
@article{article, year = {1997}, pages = {141-148}, DOI = {10.1016/S0969-806X(97)00027-3}, keywords = {EPR, 5-Methylthiocytosine, Radiation damage, Sulphur-centered radicals, Transfer of radiation energy}, journal = {Radiation physics and chemistry}, doi = {10.1016/S0969-806X(97)00027-3}, volume = {50}, number = {2}, issn = {0146-5724}, title = {Radiation energy transfer and trapping in single crystals of hemihydrate and hydrochloride of 5-methylcytosine doped with 5-methylcytosine - An EPR study}, keyword = {EPR, 5-Methylthiocytosine, Radiation damage, Sulphur-centered radicals, Transfer of radiation energy} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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