Zavoisky Physical Technical Institute

Kazan, Russia

Zavoisky Physical Technical Institute

Kazan, Russia

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Yoeun S.,Chonnam National University | Sukhanov A.,Zavoisky Physical Technical Institute | Han O.,Chonnam National University
Bioorganic Chemistry | Year: 2016

Rice allene oxide synthase-1 mutants carrying F92L, P430A or F92L/P430A amino acid substitution mutations were constructed, recombinant mutant and wild type proteins were purified and their substrate preference, UV–vis spectra and heme iron spin state were characterized. The results show that the hydroperoxide lyase activities of F92L and F92L/P430A mutants prefer 13-hydroperoxy substrate to other hydroperoxydienoic acids or hydroperoxytrienoic acids. The Soret maximum was completely red-shifted in P430A and F92L/P430A mutants, but it was partially shifted in the F92L mutant. ESR spectral data showed that wild type, F92L and P430A mutants occupied high and low spin states, while the F92L/P430A mutant occupied only low spin state. The extent of the red shift of the Soret maximum increased as the population of low spin heme iron increased, suggesting that the spectral shift reflects the high to low transition of heme iron spin state in rice allene oxide synthase-1. Relative to wild type allene oxide synthase-1, the hydroperoxide lyase activities of F92L and F92L/P430A are less sensitive to inhibition by imidazole with (13S or 9S)-hydroperoxydienoic acid as substrate and more sensitive than wild type with (13S)-hydroperoxytrienoic acid as substrate. Our results suggest that hydroperoxydienoic acid is the preferred substrate for the hydroperoxide lyase activity and (13S)-hydroperoxytrienoic acid is the preferred substrate for allene oxide synthase activity of allene oxide synthase-1. © 2016 Elsevier Inc.


PubMed | Zavoisky Physical Technical Institute and Chonnam National University
Type: | Journal: Bioorganic chemistry | Year: 2016

Rice allene oxide synthase-1 mutants carrying F92L, P430A or F92L/P430A amino acid substitution mutations were constructed, recombinant mutant and wild type proteins were purified and their substrate preference, UV-vis spectra and heme iron spin state were characterized. The results show that the hydroperoxide lyase activities of F92L and F92L/P430A mutants prefer 13-hydroperoxy substrate to other hydroperoxydienoic acids or hydroperoxytrienoic acids. The Soret maximum was completely red-shifted in P430A and F92L/P430A mutants, but it was partially shifted in the F92L mutant. ESR spectral data showed that wild type, F92L and P430A mutants occupied high and low spin states, while the F92L/P430A mutant occupied only low spin state. The extent of the red shift of the Soret maximum increased as the population of low spin heme iron increased, suggesting that the spectral shift reflects the high to low transition of heme iron spin state in rice allene oxide synthase-1. Relative to wild type allene oxide synthase-1, the hydroperoxide lyase activities of F92L and F92L/P430A are less sensitive to inhibition by imidazole with (13S or 9S)-hydroperoxydienoic acid as substrate and more sensitive than wild type with (13S)-hydroperoxytrienoic acid as substrate. Our results suggest that hydroperoxydienoic acid is the preferred substrate for the hydroperoxide lyase activity and (13S)-hydroperoxytrienoic acid is the preferred substrate for allene oxide synthase activity of allene oxide synthase-1.


Straupe S.S.,Moscow State University | Ivanov D.P.,Moscow State University | Kalinkin A.A.,Zavoisky Physical Technical Institute | Bobrov I.B.,Moscow State University | And 3 more authors.
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2013

We report an experimental self-calibrating tomography scheme for entanglement characterization in high-dimensional quantum systems using Schmidt decomposition techniques. The self-tomography technique based on maximal likelihood estimation was developed for characterizing nonideal measurements in the Schmidt basis, allowing us to infer both Schmidt eigenvalues and detecting efficiencies. © 2013 American Physical Society.


Kalachev A.,Texas A&M University | Kalachev A.,Zavoisky Physical Technical Institute | Kocharovskaya O.,Texas A&M University
Journal of Modern Optics | Year: 2011

Manipulating refractive index in time allows one to implement quantum storage in an extended resonant atomic system without recourse to inhomogeneous broadening of optical transitions or amplitude modulation of control fields, which when combined with other storage techniques provides the possibility to improve mode or channel capacity of optical storage devices. We discuss different methods of refractive index manipulation in the context of quantum storage applications, giving special attention to a simple frequency shift of an absorption structure relative to the resonant energy levels. We show that a linear modulation of refractive index in time without significant losses can be realized in doped solid-state materials such as Er 3+:Y 2SiO 5 crystal, to provide optical quantum storage. © 2011 Copyright Taylor and Francis Group, LLC.


Ivanshin V.A.,Kazan Federal University | Gataullin E.M.,Kazan Federal University | Sukhanov A.A.,Zavoisky Physical Technical Institute | Pfannenschmidt U.,University of Munster | Pottgen R.,University of Munster
Journal of Physics: Conference Series | Year: 2012

We report the electron spin resonance (ESR) measurements in the new phosphides YbRh6P4 and CeIr2P2. Details of preparation of both materials which proceeds by different techniques are given. Electronic spin-lattice relaxation (SLR) processes with an involvement of the first excited Stark sublevel of the Yb3+ ion with an energy Δ 82.1 K describe well a drastic broadening and vanishing of the ESR signal in YbRh6P4 above 10 K. The observed ESR behavior provides evidence for the relatively weak f-p hybridization effects in both phosphides in contrast to silicides YbRh2Si2 and YbIr2Si2. © Published under licence by IOP Publishing Ltd.


Latypov I.Z.,Zavoisky Physical Technical Institute | Shkalikov A.V.,Zavoisky Physical Technical Institute | Kalachev A.A.,Kazan Federal University
Journal of Physics: Conference Series | Year: 2015

The properties of a heralded single-photon source with temporal and spatial multiplexing are studied with the aim to maximize its efficiency for a given value of the second-order zero-time autocorrelation function. We show that the variable time delay, which is used for temporal multiplexing, can be optimized so that the mean number of photon passes through the switches and the total number of switches are respectively reduced to ∼ log2N and ∼ (1/2)log2N, where N is the temporal multiplexing degree. The total efficiency of such an optimized source is calculated for typical switching losses and the autocorrelation function is calculated in the presence of the detector dark-count noise. © Published under licence by IOP Publishing Ltd.


Shukhin A.A.,Zavoisky Physical Technical Institute | Akatiev D.O.,Kazan Federal University | Latypov I.Z.,Zavoisky Physical Technical Institute | Shkalikov A.V.,Zavoisky Physical Technical Institute | Kalachev A.A.,Kazan Federal University
Journal of Physics: Conference Series | Year: 2015

The properties of the backward-wave spontaneous parametric down-conversion (SPDC) in a periodically poled potassium titanyl phosphate (KTP) waveguide are studied in the context of creating narrowband heralded sources of single-photon states. The effective index of refraction and spatial profile of different waveguide modes, efficiency of different SPDC processes and purity of heralded photons are calculated numerically for a given waveguide. Compared to the usual co-propagating SPDC, spectral narrowing of the backward- wave SPDC was observed as should be expected. © Published under licence by IOP Publishing Ltd.


Lisin V.N.,Zavoisky Physical Technical Institute | Shegeda A.M.,Zavoisky Physical Technical Institute | Samartsev V.V.,Kazan Federal University
EPJ Web of Conferences | Year: 2015

A relative phase shift between the different groups of excited dipoles, which appears as result of its frequency splitting due to action of a pulse of electric or magnetic fields, depends on a time, if the pulse overlaps in time with echo-pulse. As a consequence, the echo waveform is changed. The echo time form is modulated. The inverse modulation period well enough approximates Zeeman and pseudo-Stark splitting in the cases of magnetic and, therefore, electrical fields. Thus the g-factors of ground 4I15/2 and excited 4F9/2 optical states of Er3+ ion in LuLiF4 and YLiF4 have been measured and pseudo-Stark shift of R1 line in ruby has been determined. © 2015 Owned by the authors, published by EDP Sciences.


Gimazov I.I.,Kazan Federal University | Talanov Y.I.,Zavoisky Physical Technical Institute
Magnetic Resonance in Solids | Year: 2015

The results of the electron spin resonance study of the La1−xCaxMnO3 manganite and the diphenyl-picrylhydrazyl thin films for the magnetic field parallel and perpendicular to plane of the films are presented. The temperature dependence of the demagnetizing field is obtained. The parameters of the Curie-Weiss law are estimated for the paramagnetic thin film. © Kazan Federal University (KFU).


Reichert D.,Martin Luther University of Halle Wittenberg | Zinkevich T.,Martin Luther University of Halle Wittenberg | Zinkevich T.,Zavoisky Physical Technical Institute | Saalwachter K.,Martin Luther University of Halle Wittenberg | Krushelnitsky A.,Martin Luther University of Halle Wittenberg
Journal of Biomolecular Structure and Dynamics | Year: 2012

In addressing the potential use of B-factors derived from X-ray scattering data of proteins for the understanding the (functional) dynamics of proteins, we present a comparison of B-factors of five different proteins (SH3 domain, Crh, GB1, ubiquitin and thioredoxin) with data from recent solid-state nuclear magnetic resonance experiments reflecting true (rotational) dynamics on well-defined timescales. Apart from trivial correlations involving mobile loop regions and chain termini, we find no significant correlation of B-factors with the dynamic data on any of the investigated timescales, concluding that there is no unique and general correlation of B-factors with the internal reorientational dynamics of proteins. Copyright © 2012 Taylor & Francis.

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