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  1. Article ; Online: Femtosecond Dynamics of Excited States of Chlorophyll Tetramer in Water-Soluble Chlorophyll-Binding Protein BoWSCP.

    Cherepanov, Dmitry A / Neverov, Konstantin V / Obukhov, Yuriy N / Maleeva, Yulia V / Gostev, Feodor E / Shelaev, Ivan V / Aybush, Arseny V / Kritsky, Michail S / Nadtochenko, Victor A

    Biochemistry. Biokhimiia

    2023  Volume 88, Issue 10, Page(s) 1580–1595

    Abstract: The paper reports on the absorption dynamics of chlorophyll a in a symmetric tetrameric complex of the water-soluble chlorophyll-binding protein BoWSCP. It was measured by a broadband femtosecond laser pump-probe spectroscopy within the range from 400 to ...

    Abstract The paper reports on the absorption dynamics of chlorophyll a in a symmetric tetrameric complex of the water-soluble chlorophyll-binding protein BoWSCP. It was measured by a broadband femtosecond laser pump-probe spectroscopy within the range from 400 to 750 nm and with a time resolution of 20 fs-200 ps. When BoWSCP was excited in the region of the Soret band at a wavelength of 430 nm, nonradiative intramolecular conversion S
    MeSH term(s) Chlorophyll/metabolism ; Chlorophyll A ; Water/chemistry ; Carrier Proteins ; Spectrum Analysis
    Chemical Substances Chlorophyll (1406-65-1) ; Chlorophyll A (YF5Q9EJC8Y) ; Water (059QF0KO0R) ; Carrier Proteins
    Language English
    Publishing date 2023-12-16
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1109-5
    ISSN 1608-3040 ; 0006-2979 ; 0320-9717
    ISSN (online) 1608-3040
    ISSN 0006-2979 ; 0320-9717
    DOI 10.1134/S0006297923100139
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Phosphorescence study of chlorophyll d photophysics. Determination of the energy and lifetime of the photo-excited triplet state. Evidence of singlet oxygen photosensitization.

    Neverov, Konstantin V / Santabarbara, Stefano / Krasnovsky, Alexander A

    Photosynthesis research

    2011  Volume 108, Issue 2-3, Page(s) 101–106

    Abstract: Chlorophyll d (Chl d) is the major pigment in both photosystems (PSI and II) of the cyanobacterium Acaryochloris marina, whose pigment composition represents an interesting alternative in oxygenic photosynthesis. While abundant information is available ... ...

    Abstract Chlorophyll d (Chl d) is the major pigment in both photosystems (PSI and II) of the cyanobacterium Acaryochloris marina, whose pigment composition represents an interesting alternative in oxygenic photosynthesis. While abundant information is available relative to photophysical properties of Chl a , the understanding of Chl d photophysics is still incomplete. In this paper, we present for the first time a characterization of Chl d phosphorescence, which accompanies radiative deactivation of the photoexcited triplet state of this pigment. Reliable information was obtained on the energy and lifetime of the Chl d triplet state in frozen solutions at 77 K using diethyl ether and aqueous dispersions of Triton X100 as solvents. It is shown that triplet Chl d is effectively populated upon photoexcitation of pigment molecules and efficiently sensitizes singlet oxygen phosphorescence in aerobic solutions under ambient conditions. The data obtained are compared with the previous results of the phosphorescence studies of Chl a and Pheo a, and their possible biological implications are discussed.
    MeSH term(s) Chlorophyll/metabolism ; Chlorophyll A ; Cyanobacteria/metabolism ; Cyanobacteria/radiation effects ; Light ; Luminescent Measurements/methods ; Oxygen/metabolism ; Singlet Oxygen/metabolism ; Spectrometry, Fluorescence ; Thermodynamics ; Time Factors
    Chemical Substances Chlorophyll (1406-65-1) ; Singlet Oxygen (17778-80-2) ; chlorophyll d (60L1FX1O1U) ; Oxygen (S88TT14065) ; Chlorophyll A (YF5Q9EJC8Y)
    Language English
    Publishing date 2011-05-15
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1475688-2
    ISSN 1573-5079 ; 0166-8595
    ISSN (online) 1573-5079
    ISSN 0166-8595
    DOI 10.1007/s11120-011-9657-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Low-temperature (77 K) phosphorescence of triplet chlorophyll in isolated reaction centers of photosystem II.

    Neverov, Konstantin V / Krasnovsky, Alexander A / Zabelin, Alexey A / Shuvalov, Vladimir A / Shkuropatov, Anatoly Ya

    Photosynthesis research

    2015  Volume 125, Issue 1-2, Page(s) 43–49

    Abstract: Phosphorescence characterized by the main emission band at 952 ± 1 nm (1.30 eV), the lifetime of 1.5 ± 0.1 ms and the quantum yield nearly equal to that for monomeric chlorophyll a in aqueous detergent dispersions, has been detected in isolated reaction ... ...

    Abstract Phosphorescence characterized by the main emission band at 952 ± 1 nm (1.30 eV), the lifetime of 1.5 ± 0.1 ms and the quantum yield nearly equal to that for monomeric chlorophyll a in aqueous detergent dispersions, has been detected in isolated reaction centers (RCs) of spinach photosystem II at 77 K. The excitation spectrum shows maxima corresponding to absorption bands of chlorophyll a, pheophytin a, and β-carotene. The phosphorescence intensity strongly depends upon the redox state of RCs. The data suggest that the phosphorescence signal originates from the chlorophyll triplet state populated via charge recombination in the radical pair [Formula: see text].
    MeSH term(s) Chlorophyll/analogs & derivatives ; Chlorophyll/metabolism ; Chlorophyll A ; Cold Temperature ; Luminescent Measurements ; Pheophytins/metabolism ; Photosynthetic Reaction Center Complex Proteins/metabolism ; Photosystem II Protein Complex/metabolism ; Spinacia oleracea/metabolism ; beta Carotene/metabolism
    Chemical Substances Pheophytins ; Photosynthetic Reaction Center Complex Proteins ; Photosystem II Protein Complex ; beta Carotene (01YAE03M7J) ; Chlorophyll (1406-65-1) ; chlorophyll a' (22309-13-3) ; pheophytin a (603-17-8) ; Chlorophyll A (YF5Q9EJC8Y)
    Language English
    Publishing date 2015-02-25
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1475688-2
    ISSN 1573-5079 ; 0166-8595
    ISSN (online) 1573-5079
    ISSN 0166-8595
    DOI 10.1007/s11120-015-0105-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Characterization of the low-temperature triplet state of chlorophyll in photosystem II core complexes: Application of phosphorescence measurements and Fourier transform infrared spectroscopy.

    Zabelin, Alexey A / Neverov, Konstantin V / Krasnovsky, Alexander A / Shkuropatova, Valentina A / Shuvalov, Vladimir A / Shkuropatov, Anatoly Ya

    Biochimica et biophysica acta

    2016  Volume 1857, Issue 6, Page(s) 782–788

    Abstract: Phosphorescence measurements at 77 K and light-induced FTIR difference spectroscopy at 95 K were applied to study of the triplet state of chlorophyll a ((3)Chl) in photosystem II (PSII) core complexes isolated from spinach. Using both methods, (3)Chl was ...

    Abstract Phosphorescence measurements at 77 K and light-induced FTIR difference spectroscopy at 95 K were applied to study of the triplet state of chlorophyll a ((3)Chl) in photosystem II (PSII) core complexes isolated from spinach. Using both methods, (3)Chl was observed in the core preparations with doubly reduced primary quinone acceptor QA. The spectral parameters of Chl phosphorescence resemble those in the isolated PSII reaction centers (RCs). The main spectral maximum and the lifetime of the phosphorescence corresponded to 955±1 nm and of 1.65±0.05 ms respectively; in the excitation spectrum, the absorption maxima of all core complex pigments (Chl, pheophytin a (Pheo), and β-carotene) were observed. The differential signal at 1667(-)/1628(+)cm(-1) reflecting a downshift of the stretching frequency of the 13(1)-keto C=O group of Chl was found to dominate in the triplet-minus-singlet FTIR difference spectrum of core complexes. Based on FTIR results and literature data, it is proposed that (3)Chl is mostly localized on the accessory chlorophyll that is in triplet equilibrium with P680. Analysis of the data suggests that the Chl triplet state responsible for the phosphorescence and the FTIR difference spectrum is mainly generated due to charge recombination in the reaction center radical pair P680(+)PheoD1(-), and the energy and temporal parameters of this triplet state as well as the molecular environment and interactions of the triplet-bearing Chl molecule are similar in the PSII core complexes and isolated PSII RCs.
    MeSH term(s) Chlorophyll/chemistry ; Chlorophyll/metabolism ; Kinetics ; Light-Harvesting Protein Complexes/chemistry ; Light-Harvesting Protein Complexes/metabolism ; Luminescent Measurements/methods ; Photosystem II Protein Complex/chemistry ; Photosystem II Protein Complex/metabolism ; Plant Proteins/chemistry ; Plant Proteins/metabolism ; Quinones/chemistry ; Quinones/metabolism ; Spectroscopy, Fourier Transform Infrared/methods ; Spinacia oleracea/metabolism ; Temperature ; Time Factors
    Chemical Substances Light-Harvesting Protein Complexes ; Photosystem II Protein Complex ; Plant Proteins ; Quinones ; Chlorophyll (1406-65-1)
    Language English
    Publishing date 2016-06
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 60-7
    ISSN 1879-2596 ; 1879-260X ; 1872-8006 ; 1879-2642 ; 1879-2618 ; 1879-2650 ; 0006-3002 ; 0005-2728 ; 0005-2736 ; 0304-4165 ; 0167-4838 ; 1388-1981 ; 0167-4889 ; 0167-4781 ; 0304-419X ; 1570-9639 ; 0925-4439 ; 1874-9399
    ISSN (online) 1879-2596 ; 1879-260X ; 1872-8006 ; 1879-2642 ; 1879-2618 ; 1879-2650
    ISSN 0006-3002 ; 0005-2728 ; 0005-2736 ; 0304-4165 ; 0167-4838 ; 1388-1981 ; 0167-4889 ; 0167-4781 ; 0304-419X ; 1570-9639 ; 0925-4439 ; 1874-9399
    DOI 10.1016/j.bbabio.2016.03.029
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Uc I Zs.247: Show issues Location:
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    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
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  5. Article: Phosphorescence study of chlorophyll d photophysics. Determination of the energy and lifetime of the photo-excited triplet state. Evidence of singlet oxygen photosensitization

    Neverov, Konstantin V / Santabarbara, Stefano / Krasnovsky, Alexander A. Jr

    Photosynthesis research. 2011 Sept., v. 108, no. 2-3

    2011  

    Abstract: Chlorophyll d (Chl d) is the major pigment in both photosystems (PSI and II) of the cyanobacterium Acaryochloris marina, whose pigment composition represents an interesting alternative in oxygenic photosynthesis. While abundant information is available ... ...

    Abstract Chlorophyll d (Chl d) is the major pigment in both photosystems (PSI and II) of the cyanobacterium Acaryochloris marina, whose pigment composition represents an interesting alternative in oxygenic photosynthesis. While abundant information is available relative to photophysical properties of Chl a , the understanding of Chl d photophysics is still incomplete. In this paper, we present for the first time a characterization of Chl d phosphorescence, which accompanies radiative deactivation of the photoexcited triplet state of this pigment. Reliable information was obtained on the energy and lifetime of the Chl d triplet state in frozen solutions at 77 K using diethyl ether and aqueous dispersions of Triton X100 as solvents. It is shown that triplet Chl d is effectively populated upon photoexcitation of pigment molecules and efficiently sensitizes singlet oxygen phosphorescence in aerobic solutions under ambient conditions. The data obtained are compared with the previous results of the phosphorescence studies of Chl a and Pheo a, and their possible biological implications are discussed.
    Keywords chlorophyll ; dispersions ; energy ; phosphorescence ; photosensitivity disorders ; photosynthesis ; singlet oxygen ; solvents
    Language English
    Dates of publication 2011-09
    Size p. 101-106.
    Publishing place Springer-Verlag
    Document type Article
    ZDB-ID 1475688-2
    ISSN 1573-5079 ; 0166-8595
    ISSN (online) 1573-5079
    ISSN 0166-8595
    DOI 10.1007/s11120-011-9657-x
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Phosphorescence study of chlorophyll d photophysics. Determination of the energy and lifetime of the photo-excited triplet state. Evidence of singlet oxygen photosensitization

    Neverov, Konstantin V. / Santabarbara, Stefano / Krasnovsky, Alexander A. Jr.

    Photosynthesis research

    Volume v. 108,, Issue no. 2

    Abstract: Chlorophyll d (Chl d) is the major pigment in both photosystems (PSI and II) of the cyanobacterium Acaryochloris marina, whose pigment composition represents an interesting alternative in oxygenic photosynthesis. While abundant information is available ... ...

    Abstract Chlorophyll d (Chl d) is the major pigment in both photosystems (PSI and II) of the cyanobacterium Acaryochloris marina, whose pigment composition represents an interesting alternative in oxygenic photosynthesis. While abundant information is available relative to photophysical properties of Chl a , the understanding of Chl d photophysics is still incomplete. In this paper, we present for the first time a characterization of Chl d phosphorescence, which accompanies radiative deactivation of the photoexcited triplet state of this pigment. Reliable information was obtained on the energy and lifetime of the Chl d triplet state in frozen solutions at 77 K using diethyl ether and aqueous dispersions of Triton X100 as solvents. It is shown that triplet Chl d is effectively populated upon photoexcitation of pigment molecules and efficiently sensitizes singlet oxygen phosphorescence in aerobic solutions under ambient conditions. The data obtained are compared with the previous results of the phosphorescence studies of Chl a and Pheo a, and their possible biological implications are discussed.
    Keywords photosynthesis ; solvents ; dispersions ; singlet oxygen ; photosensitivity disorders ; phosphorescence ; energy ; chlorophyll
    Language English
    Document type Article
    ISSN 0166-8595
    Database AGRIS - International Information System for the Agricultural Sciences and Technology

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  7. Article: Low-temperature (77 K) phosphorescence of triplet chlorophyll in isolated reaction centers of photosystem II

    Neverov, Konstantin V. / Krasnovsky, Alexander A., Jr / Zabelin, Alexey A. / Shuvalov, Vladimir A. / Shkuropatov, Anatoly Ya.

    Photosynthesis research

    Volume v. 125,, Issue no. 1

    Abstract: Phosphorescence characterized by the main emission band at 952 ± 1 nm (1.30 eV), the lifetime of 1.5 ± 0.1 ms and the quantum yield nearly equal to that for monomeric chlorophyll a in aqueous detergent dispersions, has been detected in isolated reaction ... ...

    Abstract Phosphorescence characterized by the main emission band at 952 ± 1 nm (1.30 eV), the lifetime of 1.5 ± 0.1 ms and the quantum yield nearly equal to that for monomeric chlorophyll a in aqueous detergent dispersions, has been detected in isolated reaction centers (RCs) of spinach photosystem II at 77 K. The excitation spectrum shows maxima corresponding to absorption bands of chlorophyll a, pheophytin a, and β-carotene. The phosphorescence intensity strongly depends upon the redox state of RCs. The data suggest that the phosphorescence signal originates from the chlorophyll triplet state populated via charge recombination in the radical pair [Formula: see text]
    Keywords absorption ; dispersions ; spinach ; phosphorescence ; photosystem II ; chlorophyll ; beta-carotene
    Language English
    Document type Article
    ISSN 0166-8595
    Database AGRIS - International Information System for the Agricultural Sciences and Technology

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