Andrei G. Yakovlev

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This work continuous a series of studies devoted to discovering principles of organization of natural antennas in photosynthetic microorganisms that generate in vivo large and highly effective light-harvesting structures. The largest antenna is observed in green photosynthesizing bacteria, which are able to grow over a wide range of light intensities and(More)
One of the main objectives of interval mathematics is to produce an interval that contains the solution to a given mathematical problem (i.e., the Cauchy problem). There exist methods that produce ellipsoids, parallelepipeds, and other types of sets that contain the same solution. To get a better estimate, it is natural to consider the intersection of sets(More)
72 Photosynthetic conversion of light energy to the free energy of chargeeseparated states proceeds in the reaction centers (RCs)—pigmenttprotein complexes in the membrane. In the RCs of the purple bacterium Rhodobacter sphaeroides, primary charge separation consists in the electron transfer from the excited bacc teriochlorophyll dimer P* to(More)
Electron-vibrational relaxation in the excited state of the primary electron donor, bacteriochlorophyll dimer P, in the reaction centers (RCs) of purple photosynthetic bacteria Rhodobacter sphaeroides is modeled. A multimode model of three states (i.e., the ground state Pg, initially excited P1*, and relaxed excited P2*) is used to calculate the incoherent(More)
Isotropic and anisotropic pump-probe spectra of Cfx. aurantiacus chlorosomes were measured on the fs-through ps-time scales for the B798 BChl a Q y band upon direct excitation of the B798 band at T = 293 K and T = 90 K. Upon direct excitation of the B798 band, the anisotropy parameter value r(λ) was constant within the whole BChl a Q y band at any delay(More)
143 The primary charge separation in photosynthesis proceeds in the reaction centers (RC)—pigmenttproo tein complexes in the photosynthetic membrane. It was established that the primary charge separation in the RC of the purple bacterium Rhodobacter (Rba.) sphaeroides involves the electron transfer from the excited dimer of bacteriochlorophyll P to bactee(More)
In this work, the influence of the crystallographic water on electron transfer between primary donor P and acceptor BA was studied in reaction centers (RCs) of the purple bacterium Rhodobacter sphaeroides and the green bacterium Chloroflexus aurantiacus. For this purpose, time constants and oscillations of charge separation kinetics are compared between dry(More)
Transient absorption difference spectroscopy with approximately 20 femtosecond (fs) resolution was applied to study the time and spectral evolution of low-temperature (90 K) absorbance changes in isolated reaction centers (RCs) of Chloroflexus (C.) aurantiacus. In RCs, the composition of the B-branch chromophores is different with respect to that of purple(More)
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