Leszek Kułak - Publications - Bridge of Knowledge

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Year 2018
  • AMCA to TAMRA long range resonance energy transfer on a flexible peptide
    Publication
    • A. Synak
    • R. Fudala
    • I. Gryczynski
    • L. Kułak
    • S. Shah
    • I. E. Serdiuk
    • B. Grobelna
    • P. Arłukowicz
    • A. Kubicki
    • P. Bojarski

    - DYES AND PIGMENTS - Year 2018

    Förster resonance energy transfer between 7-amino-4-methyl-3-coumarinylacetic acid, (AMCA, donor) and 5- carboxytetramethylrhodamine, (TAMRA, acceptor) bound to Lys(AMCA)-Gly-Pro-Arg-Ser-Leu-Ser-Gly-Lys (TAMRA)-NH2 peptide is demonstrated by various spectroscopic techniques in glycerol at room temperature. In particular, nonexponential character of fluorescence intensity decay evidences the distance distribution between the donor...

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Year 2016
  • Excitation energy transfer in partly ordered polymer films differing in donor and acceptor transition moments orientation
    Publication
    • A. Synak
    • P. Bojarski
    • M. Sadownik
    • L. Kułak
    • I. Gryczyński
    • B. Grobelna
    • S. Rangełowa-Jankowska
    • D. Jankowski
    • A. Kubicki

    - OPTICAL MATERIALS - Year 2016

    Based on spectroscopic measurements selected properties of nonradiative Förster energy transport are studied in uniaxially stretched polyvinyl alcohol thin films for three systems differing in donor and acceptor transition moments orientation relative to the axis of stretching. In particular, donor – acceptor emission anisotropy spectra yield completely different regularities for these systems in uniaxially stretched films, whereas...

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Year 2015
Year 2014
  • Spectroscopic properties of Rhodamine B entrapped in hybrid porous nanolayers at high dye concentration
    Publication
    • A. Lewkowicz
    • A. Synak
    • B. Grobelna
    • L. Kułak
    • P. Bojarski

    - CHEMICAL PHYSICS - Year 2014

    The preparation procedure and characterization of Rhodamine B entrapped in zirconia, silica and mixed silica–zirconia nanolayers is described. The nanolayers were produced by the sol–gel spin-coating technique. The pronounced effect of the dye concentration on the absorption and fluorescence spectra as well as on time-resolved fluorescence spectra was found. The results show that the aggregation of Rhodamine B is stronger in silica...

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Year 2013
  • Determination of Local Dye Concentration in Hybrid Porous Silica Thin Films
    Publication
    • A. Synak
    • P. Bojarski
    • B. Grobelna
    • L. Kułak
    • A. Lewkowicz

    - Journal of Physical Chemistry C - Year 2013

    The idea of determination of local dye concentration in a nanoporous matrix is proposed based on donor − acceptor energy transfer. The method was tested for a Rhodamine 110 − Rhodamine 101 system in silica and methylated silica nanolayers. Evaluation of acceptor (Rhodamine 101) local concentration was carried out by comparing the results of Monte Carlo simulation of energy transfer from donor (Rhodamine 110) to acceptor (Rhodamine...

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Year 2012
Year 2011
  • Long-Distance FRET Analysis: A Monte Carlo Simulation Study
    Publication

    - JOURNAL OF PHYSICAL CHEMISTRY B - Year 2011

    Zaproponowano nową metodę na rozszerzenie zakresu stosowalności rezonansowego transferu energii (FRET) przetestowaną przy pomocy metody Monte Carlo. Otrzymane rezultaty dowodzą, że wydajność procesu FRET może być znacząco zwiększona w porównaniu z wydajnością pojedynczego akceptora, gdy dla ustalonej od donora umieścimy układ blisko siebie położonych akceptorów na makromolekule. Z drugiej strony metoda ta umożliwia zwiększenie...

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  • Reversible energy transfer between monomers and fluorescent dimers of rhodamine S in polyvinyl alcohol films
    Publication

    - CHEMICAL PHYSICS - Year 2011

    Bezpromienisty transfer energii i jej pułapkowanie jest analizowane dla rodaminy S domieszkowanej w foliach PVA. Z analizy wynika że fluoryzujące dimery rodaminy S grają rolę niedoskonałych pułapek energii wzbudzenia. Dla najwyższych koncentracji barwnika wyniki doświadczalne wydajności kwantowej i anizotropii emisji nie mogą być wyjaśnione przy pomocy modelu pomijającego transfer powrotny energii do monomerów. Uwzględnienie transferu...

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