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  1. Article ; Online: In memory of Vladimir Anatolievich Shuvalov (1943-2022): an outstanding biophysicist.

    Vasilieva, Lyudmila G / Kaminskaya, Olga P / Yakovlev, Andrei G / Shkuropatov, Anatoliy Ya / Semenov, Alexey Yu / Nadtochenko, Victor A / Krasnovsky, Alexander A / Parson, William W / Allakhverdiev, Suleyman I / Govindjee, Govindjee

    Photosynthesis research

    2022  Volume 154, Issue 2, Page(s) 207–223

    Abstract: ... Richard Cogdell (UK); Arvi Freiberg (Estonia); Govindjee Govindjee (USA); Alexander Krasnovsky, jr ...

    Abstract We present here a tribute to one of the foremost biophysicists of our time, Vladimir Anatolievich Shuvalov, who made important contributions in bioenergetics, especially on the primary steps of conversion of light energy into charge-separated states in both anoxygenic and oxygenic photosynthesis. For this, he and his research team exploited pico- and femtosecond transient absorption spectroscopy, photodichroism & circular dichroism spectroscopy, light-induced FTIR (Fourier-transform infrared) spectroscopy, and hole-burning spectroscopy. We remember him for his outstanding leadership and for being a wonderful mentor to many scientists in this area. Reminiscences by many [Suleyman Allakhverdiev (Russia); Robert Blankenship (USA); Richard Cogdell (UK); Arvi Freiberg (Estonia); Govindjee Govindjee (USA); Alexander Krasnovsky, jr, (Russia); William Parson (USA); Andrei Razjivin (Russia); Jian- Ren Shen (Japan); Sergei Shuvalov (Russia); Lyudmilla Vasilieva (Russia); and Andrei Yakovlev (Russia)] have included not only his wonderful personal character, but his outstanding scientific research.
    Language English
    Publishing date 2022-09-07
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1475688-2
    ISSN 1573-5079 ; 0166-8595
    ISSN (online) 1573-5079
    ISSN 0166-8595
    DOI 10.1007/s11120-022-00932-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Remembering Navasard V. Karapetyan (1936–2015)

    Yurina, Nadezhda P / Vladimir O. Popov / Alexander A. Krasnovsky Jr / Govindjee

    Photosynthesis research. 2017 June, v. 132, no. 3

    2017  

    Abstract: Navasard Vaganovich Karapetyan (September 6, 1936—March 6, 2015) began his scientific career at the Bach Institute of Biochemistry of the Russian Academy of Sciences, Moscow, and was associated with this institute for over 56 years. He worked in the ... ...

    Abstract Navasard Vaganovich Karapetyan (September 6, 1936—March 6, 2015) began his scientific career at the Bach Institute of Biochemistry of the Russian Academy of Sciences, Moscow, and was associated with this institute for over 56 years. He worked in the area of biochemistry and biophysics of photosynthesis and was especially known for his studies on chlorophyll a fluorescence in higher plants and cyanobacteria, molecular organization of Photosystem I, photoprotective energy dissipation, and dynamics of energy migration in the two photosystems. We present here a brief biography and comments on the work of Navasard Karapetyan. We remember him as an enthusiastic person who had an unflagging curiosity, energy and profound sincere interest in many aspects of photosynthesis research.
    Keywords Cyanobacteria ; biophysics ; chlorophyll ; energy ; fluorescence ; photosystem I
    Language English
    Dates of publication 2017-06
    Size p. 221-226.
    Publishing place Springer Netherlands
    Document type Article
    ZDB-ID 1475688-2
    ISSN 1573-5079 ; 0166-8595
    ISSN (online) 1573-5079
    ISSN 0166-8595
    DOI 10.1007/s11120-017-0361-3
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Chlorophyll isolation, structure and function: major landmarks of the early history of research in the Russian Empire and the Soviet Union

    Krasnovsky, A.A. Jr

    Photosynthesis research. 2003, v. 76, no. 1-3

    2003  

    Keywords plants ; chlorophyll ; isolation ; chemical structure ; photosynthesis ; research ; history ; Russia ; USSR
    Language English
    Size p. 389-403.
    Document type Article
    Note In the special issue: Celebrating the millennium. Historical highlights of photosynthesis research, part 2 / edited by Govindjee, J. T. Beatty and H. Guest.
    ZDB-ID 1475688-2
    ISSN 1573-5079 ; 0166-8595
    ISSN (online) 1573-5079
    ISSN 0166-8595
    Database NAL-Catalogue (AGRICOLA)

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  4. 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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  5. Article: Delayed fluorescence and phosphorescence of plant pigments

    Krasnovsky, A.A. Jr

    Photochemistry and photobiology. Dec 1982. v. 36 (6)

    1982  

    Keywords plant physiology ; plant biochemistry
    Language English
    Dates of publication 1982-12
    Size p. 733-741.
    Document type Article
    Note Literature review.
    ZDB-ID 123540-0
    ISSN 1751-1097 ; 0031-8655
    ISSN (online) 1751-1097
    ISSN 0031-8655
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 77/703: Show issues

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  6. Article: Parameters of the triplet state and spectral properties of the monomeric chlorophyll in liposomes at -196 degrees C

    Krasnovsky, A.A. Jr / Semenova, A.N

    Photobiochemistry and photobiophysics. Nov 1981. v. 3 (1)

    1981  

    Title variant Parameters of the triplet state and spectral properties of the monomeric chlorophyll in liposomes at -196 degrees C [Celsius]
    Keywords plant physiology ; plant biochemistry
    Language English
    Dates of publication 1981-11
    Size p. 11-18.
    Document type Article
    ISSN 0165-8646
    Database NAL-Catalogue (AGRICOLA)

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  7. Article: Long lived afterglow of photosynthetic pigments solution: photochemiluminescence

    Krasnovsky, A.A. Jr / Litvin, F.F

    Photochemistry and photobiology. Aug 1974, 20 (2)

    1974  

    Keywords plant physiology ; plant biochemistry
    Language English
    Dates of publication 1974-08
    Size p. 133-149.
    Document type Article
    ZDB-ID 123540-0
    ISSN 1751-1097 ; 0031-8655
    ISSN (online) 1751-1097
    ISSN 0031-8655
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 77/703: Show issues

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    Inter-library loan at ZB MED

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  8. 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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  9. 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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