Search

Your search keyword '"Vinogradova, Yu."' showing total 204 results
Start Over Author "Vinogradova, Yu."
204 results on '"Vinogradova, Yu."'

31. Genotypic Variability of Acer negundoL. along the Trans-Siberian Railway

Author

Vinogradova, Yu. K. and Galkina, M. A.

Abstract

Abstract: The study of intraspecific variability of alien plants is crucial for revealing the patterns of their microevolution in the secondary distribution range and predicting the possibility of further dispersal and the ability to invade natural plant communities. It is still unclear how a genetically impoverished initial invasive population forms a taxon with a range exceeding the natural range of the species and, therefore, adapts to more diverse ecological and climatic conditions. Boxelder maple, Acer negundoL., is a remarkable object of study in this respect. The secondary distribution range of this North American species covers all regions of our planet excluding Antarctica. In Russia, it spread from Kaliningrad to Vladivostok, formed invasive populations in all eight Federal Districts, and was included in the TOP 100 of the most aggressive invasive species of the country. The intraspecific variability of its biomorphological characters was studied by us earlier, and the results of the study of genotypic variability are presented in this article. Invasive populations of A. negundolocated along the Trans-Siberian Railway from Moscow to Vladivostok (9288 km) were examined. We isolated DNA from 38 specimens collected along the Trans-Siberian railway in Vladimir and Kostroma oblasts, the Republic of Tatarstan, Perm Territory, Novosibirsk Region, Krasnoyarsk Territory, Amur Region, and Primorskii Territory. By the ITS 1–2 nuclear DNA site, specimens of Acer negundofrom the Russian part of the secondary distribution range showed very high similarity to each other, but with 100% bootstrap support differed from specimens from the natural distribution range. According to the chloroplast high-variable trnL–trnF site, the specimens were divided into two clades that weakly correlated with the geographical origin of the specimen. Separate subclades with high bootstrap support were formed by the plants (1) from Tatarstan (Kazan and Nizhnekamsk) and (2) from Perm and Novosibirsk and (3) samples from Krasnoyarsk. The haplotype network constructed at the trnL–trnF site also demonstrated the genetic specificity of the samples from Tatarstan. We hypothesized that only a few genotypes of A. negundowith a high degree of invasive activity were dispersed along the Trans-Siberian Railway (and possibly throughout all Russia). Other genotypes, including those that entered the territory of the former Russian Empire earlier, have not shown the ability to invade natural plant communities and occur rather rarely.

Published
2023
Full Text
View/download PDF

33. Ba4B11O20F: Growth of Crystals and their Stability Under High Pressures.

Author

Davydov, A. V., Vinogradova, Yu. G., Sagatov, N., and Bekker, T. B.

Subjects
*CRYSTAL growth, *RAMAN spectroscopy, *SOLID solutions, *ATMOSPHERIC pressure, *BARIUM, *TERNARY system
Abstract

Ba4B11O20F crystals are grown from the compositions of the BaF2–B2O3–Na2O–K2O system. It is established that Ba4B11O20F decomposes under 3 GPa and 6 GPa into the β-BaB4O7 barium tetraborate (Pnam) and the end-member of the Ba7(BO3)4–xF2+3x solid solution (P63). The latter has the Ba7(BO3)3F5 composition (x = 1) and does not exist under atmospheric pressure. Raman spectra of the Ba7(BO3)4–xF2+3x phase are studied for the first time. The fact that Raman spectra of the members of the solid solution synthesized under atmospheric pressure are identical to those synthesized under 3 GPa and 6 GPa indicates that the Ba7(BO3)4–xF2+3x (P63) polymorph is stable under these pressures. It is established that pressures of 3 GPa and 6 GPa enhance the incorporation of fluorine into the structure of the Ba7(BO3)4–xF2+3x solid solution and allow replacing all isomorphic anionic groups by [F4]4– groups. It is shown by numerical methods that the solid-phase decomposition of Ba4B11O20F into β-BaB4O7 and Ba7(BO3)3F5 phases occurs at 0 K under 1.3 GPa. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results