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41.
42.
V. P. Meiklyar A. E. Usachev Yu. V. Yablokov V. A. Shustov 《physica status solidi b》1985,132(2):K73-K76
43.
V. K. Voronkova L. V. Mosina A. E. Usachev Yu. V. Yablokov 《physica status solidi b》1990,158(1):337-345
The EPR spectra of single Co2+ −Co2+ pairs in CsMg1−xCoxCl3 (x = 0.0001 to 0.04) in X- and Q- bands are investigated. One type of single Co2+ spectra and four types of additional spectra attributed to Co2+ Co2+ pairs coupled by weak spin-spin interactions are observed. Using computer simulation of EPR spectra the parameters of spin-spin interaction are determined. The observed EPR spectra and the expected pair Co2+ Co2+ interactions in CsMg1−xCoxCl3 are analysed. The exchange parameters for the nearest neighbour Co2+ −Co2+ pairs in the ab-plane are estimated. The nature of the exchange anisotropy is discussed. 相似文献
44.
45.
Yu. A. Lebedev V. S. Konstantinov M. Yu. Yablokov A. N. Shchegolikhin N. M. Surin 《High Energy Chemistry》2014,48(6):385-388
It has been found that a microwave discharge in liquid n-heptane leads to the formation of a solid phase in the form of carbonaceous nanoparticles. The composition and size of the particles have been determined by means of scanning electron microscopy with energy dispersive analysis and Raman spectroscopy. Using electronic absorption and luminescence spectroscopy, it has been shown that the discharge treatment results in the formation of polycyclic aromatic hydrocarbons in liquid n-heptane. 相似文献
46.
47.
T. A. Ivanova I. Jacyna-Onyszkiewicz M. A. Augustyniak-Yablokova Yu. V. Yablokov V. A. Shustov 《Physics of the Solid State》2005,47(8):1540-1543
The orthorhombic modification of SrCuO2 ceramics and its derivatives Sr1−x
A
x
CuO2 (A = Li+, K+, La3+) were studied using the ESR and x-ray diffraction methods. Orthorhombic and axial-symmetry paramagnetic centers caused by
oxygen defects in samples were detected. From comparing the ESR and x-ray phase data, it follows that the oxygen distribution
in ceramics is inhomogeneous.
__________
Translated from Fizika Tverdogo Tela, Vol. 47, No. 8, 2005, pp. 1482–1485.
Original Russian Text Copyright ? 2005 by Ivanova, Jacyna-Onyszkiewicz, Augustyniak-Yablokova, Yablokov, Shustov. 相似文献
48.
Leonid Kaluzhskiy Pavel Ershov Evgeniy Yablokov Tatsiana Shkel Irina Grabovec Yuri Mezentsev Oksana Gnedenko Sergey Usanov Polina Shabunya Sviatlana Fatykhava Alexander Popov Aleksandr Artyukov Olga Styshova Andrei Gilep Natallia Strushkevich Alexis Ivanov 《Molecules (Basel, Switzerland)》2021,26(8)
Widespread pathologies such as atherosclerosis, metabolic syndrome and cancer are associated with dysregulation of sterol biosynthesis and metabolism. Cholesterol modulates the signaling pathways of neoplastic transformation and tumor progression. Lanosterol 14-alpha demethylase (cytochrome P450(51), CYP51A1) catalyzes one of the key steps in cholesterol biosynthesis. The fairly low somatic mutation frequency of CYP51A1, its druggability, as well as the possibility of interfering with cholesterol metabolism in cancer cells collectively suggest the clinical importance of CYP51A1. Here, we show that the natural flavonoid, luteolin 7,3′-disulfate, inhibits CYP51A1 activity. We also screened baicalein and luteolin, known to have antitumor activities and low toxicity, for their ability to interact with CYP51A1. The Kd values were estimated using both a surface plasmon resonance optical biosensor and spectral titration assays. Unexpectedly, in the enzymatic activity assays, only the water-soluble form of luteolin—luteolin 7,3′-disulfate—showed the ability to potently inhibit CYP51A1. Based on molecular docking, luteolin 7,3′-disulfate binding suggests blocking of the substrate access channel. However, an alternative site on the proximal surface where the redox partner binds cannot be excluded. Overall, flavonoids have the potential to inhibit the activity of human CYP51A1 and should be further explored for their cholesterol-lowering and anti-cancer activity. 相似文献
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