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排序方式: 共有224条查询结果,搜索用时 15 毫秒
221.
222.
Dmitry V. Bagrov Grigory S. Glukhov Andrey V. Moiseenko Maria G. Karlova Daniil S. Litvinov Petr А. Zaitsev Liubov I. Kozlovskaya Anna A. Shishova Anastasia A. Kovpak Yury Y. Ivin Anastasia N. Piniaeva Alexey S. Oksanich Viktor P. Volok Dmitry I. Osolodkin Aydar A. Ishmukhametov Alexey M. Egorov Konstantin V. Shaitan Mikhail P. Kirpichnikov Olga S. Sokolova 《Microscopy research and technique》2022,85(2):562-569
The severe COVID-19 pandemic drives the research toward the SARS-CoV-2 virion structure and the possible therapies against it. Here, we characterized the β-propiolactone inactivated SARS-CoV-2 virions using transmission electron microscopy (TEM) and atomic force microscopy (AFM). We compared the SARS-CoV-2 samples purified by two consecutive chromatographic procedures (size exclusion chromatography [SEC], followed by ion-exchange chromatography [IEC]) with samples purified by ultracentrifugation. The samples prepared using SEC and IEC retained more spikes on the surface than the ones prepared using ultracentrifugation, as confirmed by TEM and AFM. TEM showed that the spike (S) proteins were in the pre-fusion conformation. Notably, the S proteins could be recognized by specific monoclonal antibodies. Analytical TEM showed that the inactivated virions retained nucleic acid. Altogether, we demonstrated that the inactivated SARS-CoV-2 virions retain the structural features of native viruses and provide a prospective vaccine candidate. 相似文献
223.
Daniil A. Rusanov Samah Mutasim Alfadul Ekaterina Yu. Portnyagina Dr. Eugenia A. Silyanova Nikita A. Kuznetsov Kirill E. Podpovetny Prof. Dr. Alexander V. Samet Prof. Dr. Victor V. Semenov Dr. Maria V. Babak 《Chembiochem : a European journal of chemical biology》2023,24(11):e202300161
Since the discovery of anticancer properties of a naturally occurring hexacyclic marine alkaloid Lamellarin D, the attempts have been made to prepare its synthetic analogues and elucidate the effects of each structural component on their activity profile. While F-ring-free, A-ring-free and B-ring-open lamellarins are known, E-ring-free analogues have never been investigated. In this work, we developed a facile and straightforward synthetic method toward E-ring-free lamellarin analogues based on the [3+2]-cycloaddition. For the first time, we prepared several pentacyclic lamellarin analogues without E-ring in their structure and assessed their cytotoxicity in a panel of cancer cell lines in comparison with several hexacyclic lamellarins. E-ring-free lamellarins were devoid of cytotoxicity due to their poor solubility in cellular environment. 相似文献
224.
Daniil Lewin Ivo Michiels Sobhan Mohammadi Fathabad Eva Kröll Karl-Heinz Menze Doru C. Lupascu 《Advanced Engineering Materials》2023,25(18):2300142
Herein, hot-spot generation in bulk barium titanate samples is investigated during controlled current ramping at various rates using in situ dilatometry. The incubation of the flash event is separated from dielectric breakdown at high current densities, which has previously been attributed to cause flash incubation in barium titanate. The lower boundary of the onset temperature of the flash event in barium titanate is investigated through conventional flash experiments at high electric fields. Despite incubating through thermal runaway, the lower boundary does not coincide with the Debye temperature of barium titanate. 相似文献