Popova E.V.,St. Joseph University in Tanzania |
Tinkov A.A.,Orenburg State University |
Ajsuvakova O.P.,Orenburg State Pedagogical University |
Skalnaya M.G.,RUDN University |
Skalny A.V.,Orenburg State University
Medical Hypotheses | Year: 2017
The iodine deficiency disorders (IDD) include a variety of disturbances such as decreased fertility, increased perinatal and infant mortality, impaired physical and intellectual development, mental retardation, cretinism, hypothyroidism, and endemic goiter (EG). The occurrence of the latter is determined by interplay between genetic and environmental factors. The major environmental factor is iodine status that is required for normal thyroid hormone synthesis. However, other factors like intake of micronutrients and goiterogens also have a significant impact. Essential and toxic trace elements both play a significant role in thyroid physiology. We hypothesize that in terms of overexposure boron may serve as a potential goiterogen. In particular, it is proposed that boron overload may impair thyroid physiology ultimately leading to goiter formation. Certain studies provide evidential support of the hypothesis. In particular, it has been demonstrated that serum and urinary B levels are characterized by a negative association with thyroid hormone levels in exposed subjects. Single indications on the potential efficiency of B in hypothyroidism also exist. Moreover, the levels of B were found to be interrelated with thyroid volume in children environmentally exposed to boron. Experimental studies also demonstrated a significant impact of boron on thyroid structure and hormone levels. Finally, the high rate of B cumulation in thyroid may also indicate that thyroid is the target for B activity. Chemical properties of iodine and boron also provide a background for certain competition. However, it is questionable whether these interactions may occur in the biological systems. Further clinical and experimental studies are required to support the hypothesis of the involvement of boron overexposure in goiter formation. If such association will be confirmed and the potential mechanisms elucidated, it will help to regulate the incidence of hypothyroidism and goiter in endemic regions with high boron levels in soil and water. © 2017 Elsevier Ltd
Veselkin D.V.,Russian Academy of Sciences |
P'yankov S.V.,Ural Federal University |
Safonov M.A.,Orenburg State Pedagogical University |
Betekhtina A.A.,Ural Federal University
Russian Journal of Ecology | Year: 2017
Specific structural features of absorbing roots have been studied in Acer negundo (an invasive species in the southern Cisural region), compared to native Acer platanoides and A. tataricum. A comparative analysis of the diameter of fine roots, stele and bark volumes, and the frequencies of roots with retained primary bark, root hairs, arbuscular mycorrhiza, and dark septate endophytes has been performed in the invasive and native species from four habitats (by two habitats in the forest–steppe and steppe zones). The roots of A. negundo have been additionally studied in trees from two monospecific stands. It has been found that the structure of fine roots significantly differs between the invasive and native species: the roots of A. negundo are larger, with relatively poorly developed root hairs and low occurrence of dark septate endophytes. In monospecific stands, the frequency of mycorrhiza in A. negundo roots is very low, with arbuscules and dark septate endophytes being totally absent. It is concluded that specific structural features of the belowground absorbing apparatus in A. negundo are accounted for mainly by traits autonomously formed in a plant, rather than by characteristics of symbiotic relationships, and that they are not consistent with the assumption that the invasive species can utilize soil resources more effectively or more rapidly than taxonomically close native species. © 2017, Pleiades Publishing, Ltd.
Khokhlova O.S.,Russian Academy of Sciences |
Khokhlov A.A.,Russian Academy of Sciences |
Morgunova N.L.,Orenburg State Pedagogical University |
Yustus A.A.,Russian Academy of Sciences
Eurasian Soil Science | Year: 2010
Paleosols buried under kurgans of the Yamnaya (the third millennium BC) and Srubnaya (the 18th-17th centuries BC) cultures within the Skvortsovka group of kurgans in the Buzuluk River valley in Orenburg oblast have been studied. This is the area of the dry steppe zone. The changes in the paleosol properties make it possible to distinguish between relatively short-term chronointervals separately for the Yamnaya and Srubnaya cultures. The paleosol data and radiocarbon dating have been used for revealing the relative order of the construction of the kurgans within these chronointervals and for the paleoclimatic reconstruction. Quite definite changes took place in the soil formation from the beginning to the end of the particular chronointervals: the contents of humus and exchangeable bases and the portion of calcium ions in the composition of the exchangeable cations increased in parallel with the enhanced leaching of carbonates and the enhanced biological activity. These changes attest to the increasing amount of precipitation. In general, the climate of the Srubnaya cultural epoch was less continental, whereas the climate of the Yamnaya cultural epoch was relatively close to the modern climate. The 14C dates of the pedogenic carbonates in the upper meter of the paleosol profiles have been used as auxiliary data to confirm the sequence of the soil's burial during the short chronointervals corresponding to the humid stages of the paleosol's evolution, and the 14C dates of the diagenetic carbonates have been used to determine the dates of construction of the kurgans with due account for some time gap between the construction of the kurgans and the appearance of these carbonates in the buried soil profiles. © 2010 Pleiades Publishing, Ltd.
Leneva E.A.,Orenburg State Pedagogical University
Zoologicheskii Zhurnal | Year: 2011
In 2002-2006, ration of three species in small falcons in the steppe of the South Urals was studied. During nesting periods, it consisted of rodents, reptiles, and insects. Within the area investigated, the ration of redfooted falcon (Falco vespertinus), Eurasian kestrel (Falco tinnunculus) and lesser kestrel (Falco naumanni) was related to species, the daily activity of which did not partially or wholly coincide, rather than to mass available species.
Irina M.,Orenburg State Pedagogical University |
Natalia M.,Orenburg State Pedagogical University |
Svetlana V.,Orenburg State Pedagogical University
Biosciences Biotechnology Research Asia | Year: 2015
The work presents a review of the problem student'screativitydevelopment in informational and educational environment of educational organization. Article presents theoretical basis of student's creativity development in informational and educational environment of educational organization. Essential characteristics of creativity concept such as development levels, structural components (operational, cognitive and motivational) are analyzed in the article along with conceptual field of the problem of student's creativity development in informational and educational environment of educational organization. Age specific of the youth that has substantial impact on student's creativity development has been revealed. Informational and educational environment of educational organization that contains external factors of student's creativity development is viewed as a system of informational educational resources and tools that provide conditions for realization of the main educational program of educational organization. Informational and educational environment of educational organization is characterized by such features as openness, humanitarian character, variability, ICT availability (availability of information and communication technologies). Besides pedagogical conditions of organization of informational and educational environment of educational organization aimed on development of student's creativity under the condition of informatization of educational process are presented. Considering of informational and educational environment in the context of student's preparation to life in information society and design of this environment on the base of activity approach is one of essential conditions. The other condition of development of student's creativity is project activity as the main type of activity. Preparation of pedagogical team of educational organization to collective creative work of students and pedagogues in development and effective application of multimedia resources in educational process is important condition of development of student's creativity.
Morgunova N.L.,Orenburg State Pedagogical University |
Khokhlova O.S.,Russian Academy of Sciences
Radiocarbon | Year: 2013
We studied the chronology and periodization of the Pit-Grave (Yamnaya) culture at the Volga and Ural interfluve. Establishing the chronology of the Pit-Grave culture by archaeological methods is difficult due to the lack of artifacts in the burials. Therefore, we excavated 3 kurgan groups in the Orenburg region of Russia during the last decade. Eighteen kurgans of the Pit-Grave culture were studied using archaeological and paleopedological methods and radiocarbon dating. The funeral complexes studied were divided into 3 stages. A variety of carbon-containing materials from the same complexes were dated by different laboratories to increase the accuracy of the obtained dates. In addition, from the excavations of the last years some monuments of the Repino stage, the earliest period of the Pit-Grave culture, were dated using ceramics. Together with archaeological and paleopedological data, 14C dating helped to clarify and, in general, to confirm the 3-stage periodization of the Pit-Grave culture in the Volga-Ural interfluve: the early (Repino) stage, 4000-3300 BC; the advanced (classical) stage, 3300-2600 BC, which is divided into substages A and B at 3300-2900 and 2900-2600 BC, respectively; and the late (Poltavkinsky) stage, 2600-2300 BC. © 2013 by the Arizona Board of Regents on behalf of the University of Arizona.
Lyubichankovskiy S.V.,Orenburg State Pedagogical University |
Nikolaeva O.Yu.,Orenburg State Pedagogical University
Bylye Gody | Year: 2016
The subject of food crisis of 1891-1892 in the Russian Empire, including the organization of public works by the government, has long history of studying. This problem gradually moved from the periphery to the center of attention of researchers. The Orenburg region in this context is the real terra incognito as its rich sources materials wasn't attracted at the solution of the matter at all though this region appeared among the most affected territories. Government campaign of the help to the population which was injured from a crop failure of 1891 included measures for regulation of the grain prices and railway tariffs, food aid in the form of grain loans and the labor help. Within the Orenburg region the main actions were the loan operation and the organization of public works. Unlike the loan operation introduction of public works in the Orenburg region in practice was inefficient - only 4% of the needing population used this type of the help. The reasons of so obvious failure of campaign for opening of public works consisted in the wrong approach to its organization: the untimely beginning (the majority of works opened in the spring of 1892 when crisis declined, and peasants were busy in their fields), the wrong choice of works (the majority of works were connected with construction and demanded special skills which peasants didn't possess). Copyright © 2016 by Sochi State University.
Dzhenzher V.O.,Orenburg State Pedagogical University
IEEE Global Engineering Education Conference, EDUCON | Year: 2014
Scratch is an excellent choice for schools. It can be used as a first language, and even as the main programming language. At the same time, Scratch is a magnificent environment for modeling and creative work [6-8, 12]. Despite its apparent simplicity and 'toy-like' features, Scratch is based on the most advanced concepts of programming and prepares young programmers to use new technologies in the future. © 2014 IEEE.
Lozenko G.F.,Orenburg State Pedagogical University |
Dzhenzher V.O.,Orenburg State Pedagogical University |
Denisova L.V.,Orenburg State Pedagogical University
Life Science Journal | Year: 2014
The article describes the work experience in training future teachers of computer skills at the pedagogical university in extra-curricular activities with schoolchildren. The study of the basic concepts of the robotic technology based on Lego Mindstorms NXT 2.0, the basic concepts of programming in the Scratch environment, and of the web 2.0 social network services is suggested as examples of the extra-curricular activity. The study of the basic concepts of the robotic technology assumes reviewing of robots construction and programming languages. The Scratch environment study assumes teaching programming to grade school students. The study of the web 2.0 services assumes involvement of future teachers in the distant creative academic competitions on this subject.
Helminck G.F.,University of Amsterdam |
Helminck A.G.,North Carolina State University |
Opimakh A.V.,Orenburg State Pedagogical University
Theoretical and Mathematical Physics | Year: 2010
We develop a group theory approach for constructing solutions of integrable hierarchies corresponding to the deformation of a collection of commuting directions inside the Lie algebra of upper-triangular ℤ × ℤ matrices. Depending on the choice of the set of commuting directions, the homogeneous space from which these solutions are constructed is the relative frame bundle of an infinite-dimensional flag variety or the infinite-dimensional flag variety itself. We give the evolution equations for the perturbations of the basic directions in the Lax form, and they reduce to a tower of differential and difference equations for the coefficients of these perturbed matrices. The Lax equations follow from the linearization of the hierarchy and require introducing a proper analogue of the Baker-Akhiezer function. © 2010 MAIK/Nauka.