27 Result(s)

Article

Temperature Dependence of the Nonlinear Dynamics of the Deactivation of Excited States of Tryptophan in Various Media

The authors’ research on the dynamics of the excited states of tryptophan in various solvents as a function of temperature (–170 to +20°С) is presented. The antibatic behavior of the temperature dependences of...

V. V. Gorokhov, P. P. Knox, B. N. Korvatovsky… in Russian Journal of Physical Chemistry B (2023)

Article

A Study of the State of Photosynthetic Pigments of Hybrid Maize Seeds Exposed to Ultraviolet and Radiation

Abstract—We investigated the state of the pigments of inbred (zpp1225) and hybrid (zp341) maize (Zea mays L.) seeds exposed to ultraviolet radiation and α-irradiation using spectral methods. Exposure to different...

O. V. Slatinskaya, F. F. Protopopov, N. Kh. Seifullina, D. N. Matorin… in Biophysics (2018)

Article

Influence of trehalose on high-temperature stability of the photosynthetic reaction centers

The effect of heating at 65°C for 20 min on the absorption spectra and kinetics of the dark recombination of charges separated between photoactive bacteriochlorophyll and quinone acceptors was studied in dry f...

P. P. Knox, E. P. Lukashev, N. Kh. Seifullina… in Doklady Biochemistry and Biophysics (2017)

Article

Temperature dependence of tryptophan fluorescence lifetime in aqueous glycerol and trehalose solutions

The temperature dependences of tryptophan fluorescence decay kinetics in aqueous glycerol and 1 M trehalose solutions were examined. The fluorescence decay kinetics were recorded in the spectral region of 292....

V. V. Gorokhov, P. P. Knox, B. N. Korvatovskiy, N. Kh. Seifullina… in Biochemistry (Moscow) (2017)

Article

The Effects of ultraviolet irradiation on hybrid films of photosynthetic reaction centers and quantum dots in various organic matrices

The effects of ultraviolet radiation (up to 0.6 J/cm²) on the absorption spectra and electron transfer in dehydrated films of photosynthetic reaction centers from purple bacteria Rb. sphaeroides and hybrid struct...

E. P. Lukashev, I. P. Oleinikov, P. P. Knox, N. Kh. Seifullina… in Biophysics (2017)

Article

The influence of dipyridamole and its derivatives on the membrane energization state of Rhodobacter sphaeroides bacterial chromatophores

The mechanisms of the specific influence of dipyridamole therapy remain as a subject of research. In the present work the effects of dipyridamole and some its derivatives on the energization state of photosynt...

P. P. Knox, E. P. Lukashev, N. Kh. Seifullina, V. V. Gorokhov, A. B. Rubin in Biophysics (2017)

Article

Generation of radical form of dipyridamole at illumination of photosynthetic reaction centers of Rb. sphaeroides

The study of the effect of vasodilator, antiplatelet agent, and inhibitor P-glycoprotein dipyridamole (DIP) on the functioning of the transmembrane protein of the reaction center (RC) of Rb. sphaeroides showed th...

P. P. Knox, K. N. Timofeev, V. V. Gorokhov… in Doklady Biochemistry and Biophysics (2017)

Article

Effect of chromate ions on marine microalgae Phaeodactylum tricornutum

Effect of chromate ions on the culture of a marine diatom Phaeodactylum tricornutum was studied using an M-PEA-2 fluorimeter, which carries out simultaneous measurement of fluorescence induction and redox transfo...

D. T. Gabbasova, D. N. Matorin, I. V. Konyukhov, N. Kh. Seifullina… in Microbiology (2017)

Article

Investigation of stability of photosynthetic reaction center and quantum dot hybrid films

The efficiency of interaction (efficiency of energy transfer) between various quantum dots (QDs) and photosynthetic reaction centers (RCs) from the purple bacterium Rhodobacter sphaeroides and conditions of long-...

E. P. Lukashev, P. P. Knox, I. P. Oleinikov, N. Kh. Seifullina… in Biochemistry (Moscow) (2016)

Article

Effect of methylmercury on the light dependence fluorescence parameters in a green alga Chlamydomonas moewusii

The effect of a dangerous toxic substance, methylmercury, on light dependence curves of chlorophyll fluorescence in Chlamydomonas moewusii was studied. We found low concentration of methylmercury (10^–7 M) to caus...

F. F. Protopopov, D. N. Matorin, N. Kh. Seifullina, L. B. Bratkovskaya… in Microbiology (2015)

Article

Mechanisms of anomalous temperature dependence of the recombination of the photoseparated charges between bacteriochlorophyll and primary quinone in Rb. sphaeroides: The role of RC hydrogen bonds

E. P. Lukashev, P. P. Knox, P. M. Krasilnikov… in Doklady Biochemistry and Biophysics (2014)

Article

Properties of hybrid hybrid complexes composed of photosynthetic reaction centers from the purple bacterium Rhodobacter sphaeroides and quantum dots in lecithin liposomes

Quantum dots (QDs) can absorb ultraviolet and long-wavelength light energy much more efficiently than natural light-harvesting proteins and transfer the excitation energy to photosynthetic reaction centers (RC...

V. E. Zagidullin, E. P. Lukashev, P. P. Knox, N. Kh. Seifullina… in Biochemistry (Moscow) (2014)

Article

The spectral-kinetic indicators of relaxation processes following the electron stabilization into the acceptor compartment of photosynthetic RCs of bacteria

P. P. Knox, P. M. Krasilnikov, E. P. Lukashev… in Doklady Biochemistry and Biophysics (2014)

Article

Effect of silver nanoparticles on the parameters of chlorophyll fluorescence and P₇₀₀ reaction in the green alga Chlamydomonas reinhardtii

Acute toxicity of silver nanoparticle (AgNP) for photosynthesis in Chlamydomonas reinhardtii was studied using an M-PEA2 fluorimeter. Analysis of the fluorescence induction curves in the presence of AgNP at low c...

D. N. Matorin, D. A. Todorenko, N. Kh. Seifullina, B. K. Zayadan… in Microbiology (2013)

Article

Photophysical properties of hybrid complexes of quantum dots and reaction centers of purple photosynthetic bacteria Rhodobacter sphaeroides adsorbed on crystalline mesoporous TiO₂ films

Complexes of CdSe/ZnS and CdTe quantum dots (QDs) with proteins of reaction centers (RCs) of purple bacteria Rhodobacter sphaeroides have been obtained. An efficient energy transfer from QDs (a donor of electron ...

E. G. Maksimov, E. P. Lukashev, N. Kh. Seifullina… in Nanotechnologies in Russia (2013)

Article

Influence of carbon nanotubes on chlorophyll fluorescence parameters of green algae Chlamydomonas reinhardtii

It has been shown that carbon nanotubes are capable of decreasing the development speed of Chlamydomonas reinhardtii algae culture and significantly changing the parameters of chlorophyll fluorescence that charac...

D. N. Matorin, A. V. Karateyeva, V. A. Osipov, E. P. Lukashev… in Nanotechnologies in Russia (2010)

Article

Increased toxic effect of methylmercury on Chlorella vulgaris under high light and cold stress conditions

The toxic effect of methylmercury on the photosynthetic activity of Chlorella vulgaris was shown to increase under high illumination and unfavorable low temperature. Increased toxic action of methylmercury result...

D. N. Matorin, V. A. Osipov, N. Kh. Seifullina, P. S. Venediktov… in Microbiology (2009)

Article

Stabilization of the electron in the quinone acceptor part of the Rhodobacter sphaeroides reaction centers

The evolution of the light-induced absorption difference spectrum (380–500 nm) of the reaction centers from photosynthetic purple bacteria Rhodobacter sphaeroides has been examined over 200 μs. The observed chang...

P. P. Knox, P. M. Krasilnikov, P. A. Mamonov, N. Kh. Seifullina, A. F. Uchoa… in Biophysics (2008)

Article

A study of protein structure changes during hydration by diffuse X-ray scattering: II. Fourier transform analysis of diffuse X-ray scattering data

Radial distribution functions were deduced by Fourier transform analysis of the angular dependences of diffuse X-ray scattering intensities for the following proteins with different hydration degrees: water-so...

Yu. F. Krupyansky, M. G. Mikhailyuk, S. V. Esin, G. V. Eshchenko, A. P. Moroz… in Biophysics (2006)