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31 results on '"Stepanova, A.N."'

1. Influence of propolis biologically active substances on blood biochemical parameters and morphometric indicators of intestines of store pigs

Author

Gaponov N.V., Yagovenko G.L., Stepanova A.N., Neverova O.P, and Gorelik O.V.

Subjects
Environmental sciences, GE1-350
Abstract

The results of research in some cases allow to judge the change in the functional activity of the studied organs after the use of the preparation. The obtained factual material significantly supplements the information about the biological properties of the propolis water-alcohol emulsion. In practical veterinary medicine, the results of research can be taken into account when prescribing propolis for therapeutic and preventive purposes. Thus, as a result of the study, it was found that the most characteristic histological changes in the structural components of the intestinal wall are observed in the ileum of young pigs and pigs of the experimental groups. The height of this intestine villi in young pigs of the experimental group is 280.97 ± 3.37 microns, and in the control group - 193.89 ± 2.66 microns (p< 0.001). In pigs treated with the preparation, the villi also have a higher height - 256.89 ± 1.62 microns compared to 163.96 ± 0.61 microns in the control group. In young pigs and pigs of the control groups, the shape of the ileum villi is finger-shaped or bottle-shaped, and in animals of the experimental groups their forms are more differentiated - bottle-shaped, leaf-shaped and dome-shaped. This will allow store pigs receiving propolis preparation to better absorb the nutrients of the diet and gain weight faster. The research results are of interest to researchers developing propolis preparations for oral use.

Published
2020
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8. Whisker probes

Author

Givargizov, E.I, Stepanova, A.N, Obolenskaya, L.N, Mashkova, E.S, Molchanov, V.A, M.E, Givargizov, and Rangelow, I.W

Published
2000
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11. Local Auxin Sources Orient the Apical-Basal Axis in Arabidopsis Embryos

Author

Robert, H.S., Grones, P., Stepanova, A.N., Robles, L.M., Lokerse, A.S., Alonso, J.M., Weijers, D., Friml, J., Robert, H.S., Grones, P., Stepanova, A.N., Robles, L.M., Lokerse, A.S., Alonso, J.M., Weijers, D., and Friml, J.

Abstract

Establishment of the embryonic axis foreshadows the main body axis of adults both in plants and in animals, but underlying mechanisms are considered distinct. Plants utilize directional, cell-to-cell transport of the growth hormone auxin [1 and 2] to generate an asymmetric auxin response that specifies the embryonic apical-basal axis [3, 4, 5 and 6]. The auxin flow directionality depends on the polarized subcellular localization of PIN-FORMED (PIN) auxin transporters [7 and 8]. It remains unknown which mechanisms and spatial cues guide cell polarization and axis orientation in early embryos. Herein, we provide conceptually novel insights into the formation of embryonic axis in Arabidopsis by identifying a crucial role of localized tryptophan-dependent auxin biosynthesis [ 9, 10, 11 and 12]. Local auxin production at the base of young embryos and the accompanying PIN7-mediated auxin flow toward the proembryo are required for the apical auxin response maximum and the specification of apical embryonic structures. Later in embryogenesis, the precisely timed onset of localized apical auxin biosynthesis mediates PIN1 polarization, basal auxin response maximum, and specification of the root pole. Thus, the tight spatiotemporal control of distinct local auxin sources provides a necessary, non-cell-autonomous trigger for the coordinated cell polarization and subsequent apical-basal axis orientation during embryogenesis and, presumably, also for other polarization events during postembryonic plant life [ 13 and 14].

Published
2013

17. Growth of diamond particles on sharpened Si tips

Author

Givargizov, E.I., primary, Aksenova, L.L., additional, Galstyan, V.G., additional, Kiselev, A.N., additional, Kuznetsov, A.V., additional, Muratova, V.I., additional, Rakova, E.V., additional, and Stepanova, A.N., additional

Published
1996
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