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Crystallography Reports - Methods of coherent X-ray diffraction imaging of the spatial structure of noncrystalline objects and nanocrystals (nanostructures) are considered. Particular attention is... 相似文献
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M. V. Koval’chuk E. B. Yatsishina A. E. Blagov E. Yu. Tereshchenko P. A. Prosekov Yu. A. Dyakova 《Crystallography Reports》2016,61(5):703-717
X-ray and synchrotron methods that are most widely used in studies of cultural heritage objects (including archaeological sites)—X-ray diffraction analysis, X-ray spectroscopy, and visualization techniques— have been considered. The reported examples show high efficiency and informativeness of natural science studies when solving most diverse problems of archaeology, history, the study of art, museology, etc. 相似文献
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A. E. Blagov Yu. A. Dyakova M. V. Kovalchuk V. G. Kohn M. A. Marchenkova Yu. V. Pisarevskiy P. A. Prosekov 《Crystallography Reports》2016,61(3):362-370
A new approach to the study of the structural quality of crystals is proposed. It is based on the use of X-ray standing-wave method without measuring secondary processes and considers the multiwave interaction of diffraction reflections corresponding to different harmonics of the same crystallographic reflection. A theory of multiwave X-ray diffraction is developed to calculate the rocking curves in the X-ray diffraction scheme under consideration for a long-period quasi-one-dimensional crystal. This phase-sensitive method is used to study the structure of a multilayer lead stearate film on a silicon substrate. Some specific structural features are revealed for the surface layer of the thin film, which are most likely due to the tilt of the upper layer molecules with respect to the external normal to the film surface. 相似文献
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A. E. Blagov Yu. V. Pisarevskii P. A. Prosekov A. V. Targonskii Ya. A. Eliovich A. I. Protsenko M. V. Koval’chuk 《Crystallography Reports》2017,62(6):831-836
The method for X-ray wavelength tuning using an adaptive element (a quartz monolithic resonator modulated by a standing longitudinal low-frequency ultrasonic wave) has been proposed and implemented. This method is characterized by high tuning accuracy and possibility of scanning X-ray beam parameters with a time resolution of up to 3 μs. 相似文献
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M. V. Kovalchuk P. A. Prosekov M. A. Marchenkova A. E. Blagov Yu. A. D’yakova E. Yu. Tereshchenko Yu. V. Pisarevskii O. A. Kondratev 《Crystallography Reports》2014,59(5):679-684
The results of an in situ study of the growth of tetragonal lysozyme crystals by high-resolution X-ray diffractometry are considered. The crystals are grown by the sitting-drop method on crystalline silicon substrates of different types: both on smooth substrates and substrates with artificial surface-relief structures using graphoepitaxy. The crystals are grown in a special hermetically closed crystallization cell, which enables one to obtain images with an optical microscope and perform in situ X-ray diffraction studies in the course of crystal growth. Measurements for lysozyme crystals were carried out in different stages of the crystallization process, including crystal nucleation and growth, developed crystals, the degradation of the crystal structure, and complete destruction. 相似文献
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Vyacheslav Dolganyuk Anna Andreeva Stanislav Sukhikh Egor Kashirskikh Alexander Prosekov Svetlana Ivanova Philippe Michaud Olga Babich 《Molecules (Basel, Switzerland)》2022,27(18)
The Baltic Sea algae species composition includes marine euryhaline, freshwater euryhaline, and true brackish water forms. This study aimed to isolate a lipid–pigment complex from microalgae of the Baltic Sea (Kaliningrad region) and investigate its antimicrobial activity against Gram-positive and Gram-negative bacteria. Microalgae were sampled using a box-shaped bottom sampler. Sequencing was used for identification. Spectroscopy and chromatography with mass spectroscopy were used to study the properties of microalgae. Antibiotic activity was determined by the disc diffusion test. Lipids were extracted using the Folch method. Analysis of the results demonstrated the presence of antimicrobial activity of the lipid–pigment complex of microalgae against E. coli (the zone diameter was 17.0 ± 0.47 mm and 17.0 ± 0.21 mm in Chlorella vulgaris and Arthrospira platensis, respectively) and Bacillus pumilus (maximum inhibition diameter 16.0 ± 0.27 mm in C. vulgaris and 16.0 ± 0.22 mm in A. platensis). The cytotoxic and antioxidant activities of the lipid complexes of microalgae C. vulgaris and A. platensis were established and their physicochemical properties and fatty acid composition were studied. The results demonstrated that the lipid–pigment complex under experimental conditions was the most effective against P. pentosaceus among Gram-positive bacteria. Antimicrobial activity is directly related to the concentration of the lipid–pigment complex. The presence of antibacterial activity in microalgae lipid–pigment complexes opens the door to the development of alternative natural preparations for the prevention of microbial contamination of feed. Because of their biological activity, Baltic Sea microalgae can be used as an alternative to banned antibiotics in a variety of fields, including agriculture, medicine, cosmetology, and food preservation. 相似文献
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Folomeshkin M. S. Volkovsky Yu. A. Prosekov P. A. Galiev G. B. Klimov E. A. Klochkov A. N. Pushkarev S. S. Seregin A. Yu. Pisarevsky Yu. V. Blagov A. E. Kovalchuk M. V. 《Crystallography Reports》2022,67(3):317-322
Crystallography Reports - Epitaxial In0.53Ga0.47As films, grown on GaAs substrates with the (100) and (111)А crystallographic orientations in the standard high-temperature and low-temperature... 相似文献
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Crystallography Reports - An Erratum to this paper has been published: https://doi.org/10.1134/S106377452134006X 相似文献
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Seregin A. Yu. Prosekov P. A. Chukhovsky F. N. Volkovsky Yu. A. Blagov A. E. Kovalchuk M. V. 《Crystallography Reports》2019,64(4):545-552
Crystallography Reports - The triple-crystal high-resolution X-ray diffraction scheme has been experimentally and theoretically investigated using reciprocal space mapping. The procedure for... 相似文献