Time filter

Source Type

Kyzyl-Oktyabr’skiy, Russia

Barinov V.V.,Siberian Federal University | Myglan V.S.,Siberian Federal University | Taynik A.V.,Siberian Federal University | Oydupa O.C.,Tuvan State University | Vaganov E.A.,Siberian Federal University
Contemporary Problems of Ecology

This paper presents results of the spatial distribution of anomalies (disturbances) in the anatomical structure of the annual and missing rings of Siberian larch at the upper forest line in the Republic of Tuva. The spatial analysis of tree-ring chronologies that was conducted on six sites (Mongun, Kolchan, Tan, Derzik, Kungur, and Taris) has made it possible to identify the extreme events of local (1662, 1699, 1792, 1804, 1814, 1821, 1847, 1867, and 1993), regional (1698, 1754, 1775, 1779, 1785, 1788, 1789, 1797, 1813, 1819, 1843, 1854, 1869, 1870, 1882, 1911, and 1923), and interregional (1783, 1784, 1812, and 1884) importance; the latter are in good agreement with the data on large volcanic eruptions (the Grimsvotn, Lakagigar, Soufriere St. Vincent, and Krakatau volcanoes) and data from historical sources. © 2015, Pleiades Publishing, Ltd. Source

Stolpovsky Y.A.,Russian Academy of Sciences | Kol N.V.,Russian Academy of Sciences | Evsyukov A.N.,Russian Academy of Sciences | Nesteruk L.V.,Russian Academy of Sciences | And 3 more authors.
Russian Journal of Genetics

The genetic variability in seven yak populations from the Sayan-Altai region and in F1 hybrids between yak and cattle (khainags) was investigated with the help of a technique that involves the use of inter simple sequence repeat (ISSR) markers generated with PCR primers (AG)9C and (GA)9C. Samples for the analysis were collected in Mongolia, Tuva, and Altai from 2008 through 2012. The examined yak populations differed in in the presence/absence of ISSR fragments, as well as in their frequency. In total, 46 ISSR fragments were identified using two marker systems; the proportion of polymorphic loci constituted 76% and 90% for the AG-ISSR and GA-ISSR markers, respectively. For the total sample of yaks, total genetic diversity (Ht), within-population diversity (Hs), and interpopulation diversity (Gst) constituted 0.081, 0.044, and 0.459 for the AG-ISSR and 0.137, 0.057, and 0.582 for the GA-ISSR markers, respectively. Based on ISSR finger-printing, species- and breed-specific DNA patterns were described for the three groups of animals (yaks, cattle, khainags). For the domestic yak, the species-specific profile was represented by eight ISSR fragments. Genetic relationships between the yak populations, cattle breeds, and khainags were examined with the help of four different approaches used in the analysis of population structure: estimation of phylogenetic similarity, multidimensional scaling, principal component analysis, and cluster analysis. Clear evidence on the differentiation of the populations examined at the interspecific, as well as at intraspecific, level were obtained. Similar (relative), as well as remote (isolated), yak populations were identified. Khainags occupy an intermediate position between yak and cattle. However, the data on the ISSR-PCR marker polymorphism (genome polymorphism, population structure) indicate that part of the analyzed khainag genome was more similar to the yak genome than to the cattle genome. © 2014, Pleiades Publishing, Inc. Source

Bolotin S.,St. Petersburg State University of Architecture and Civil Engineering | Dadar A.,Tuvan State University | Ptuhina I.,Polytechnic University of Mozambique
Advanced Materials Research

The article deals with the practices of how to estimate pessimistic scenarios of construction tasks duration which are based on latent regularities of space-time and space-cost analogies. It is presented herein that planned values of tasks duration are sufficient to be used for optimistic scenarios development. But in case of pessimistic duration it is necessary to consider planned durations and starting points of work tasks, as well as such a discount rate which is used to estimate economic efficiency of an investment construction project under study. © (2014) Trans Tech Publications, Switzerland. Source

Buduk-Ool L.K.,Tuvan State University
Human Ecology

We studied the characteristics of adaptation to training students of the two ethnic groups living in the Republic of Tuva. It is shown that students, regardless of nationality have low functionality of external respiration. The study found that students of Tuva, in contrast to Russian characterized by satisfactory adaptive capacity, higher levels of physical condition, indicating a more advanced physiological mechanisms of adaptation. Students Tuvinian nationality are characterized by higher levels of anxiety, introversion, melancholic and phlegmatic prevalence of types of temperament, which determines the low level of psychosocial adaptation in teaching at the university. The students observed various types of adaptive strategies: Tuvinian process of adaptation to the educational activity is determined by the smaller number of inter-level relationships within and that indicates a high adaptive capacity of the organism. Observed among Russian students steadily increasing number of relationships indicates uneconomical type of adaptive responses, accompanied by a decline in physiological reserves. Source

Kavai-ool U.N.,Tuvan State University | Ezhova T.A.,Russian Academy of Sciences
Moscow University Biological Sciences Bulletin

Results of the flower structure analysis of single mutants abr, ap3-1, and pi-1 and double mutants abr ap3-1 and abr pi-1 of the Arabidopsis thaliana are presented. An increase in the expressivity of the ap3-1 and pi-1 mutations against a background of the abr mutation which break auxin transport was detected. Unlike flowers of parental mutant plants which had stamens in our experiment, stamens were absent in basal flowers of double mutants. It can be assumed that anomalies in auxin distributions in cells can break the program of the development of stamens which is triggered by the ap3-1 and pi-1 alleles remaining the residual function during the plant growing at 21-24°C. © 2011 Allerton Press, Inc. Source

Discover hidden collaborations