Anatomy of the leaf blades of Waldsteinia ternata (Stephan) Fritsch (Rosaceae) grown under different light conditions

The paper reports the results of a comparative study of the anatomical structures of the leaf blades of Waldsteinia ternata grown under different light conditions in the Siberian Botanical Garden of Tomsk State University. Waldsteinia ternata is a tertiary nemoral relict from the mountains of southern Siberia, which is found in a limited number of taiga communities due to narrow environmental tolerance to various factors. The species remains poorly studied; comprehensive studies of the anatomical features of its leaves have not been performed on the territory of Russia. Leaves of W. ternata are dorsoventral and amphistomatous with anomocytic type stomata. The plants are classified as mesophytes. The relationship between the development of the anatomical structure of leaves and light conditions was revealed. The W. ternata plants grown in the sun showed an increased number of stomata and epidermal cells, an increased thickness of the leaf and mesophyll, and an increased number of cells of the upper and lower epidermis, that is, the plants exhibited heliophytic features of plant adaptation to good light conditions. At the same time, the vascular tissues of the plants grown in the sun were less developed, which reflected their adaptation to unfavorable water conditions. A number of relative indicators, such as the stomatal index of the lower epidermis, the ratio of the palisade to spongy mesophyll, and the ratio of xylem to phloem, did not change under different growth conditions. Thus, under different light and water conditions, W. ternata acquires helioxeromorphic or sciomesomorphic features

Leaf anatomy of valuable species of genus Primula

In this research, we discovered a number of structural adaptations and informative characteristics for the leaf blades of the studied species from the genus Primula L. The species under study were found to have anomocytic stomatal type. The leaf blades are hypostomatic (P. denticulata) or with the predominant abaxial stomata (P. macrocalyx, P. pallasii). The following indicators have low variation (CV < 20 %): size of stomata, number of cells in the upper and lower epidermis, height of cells in the upper mesophyll layer, lamina thickness near the midvein and central part, phloem cross-section area, and vascular bundle area. High and very high variation level is observed for the quantitative indicators describing the leaf indument density, number of stomata and stomatal index of the upper epidermis. The data obtained can be used to evaluate the species adaptability and to develop the appropriate light and hydrothermal regime for cultivating the species in the Western Siberia sub-boreal forest environment

Problems and prospects of hostels in Yekaterinburg

The article is devoted to the development of hostels as a special type of accommodations on the Ekaterinburg hotel industry market. The author identifies problems and offers options for their solutions. The author also determines the further development of hostels as a perspective component of the hotel business of Ekaterinburg.Статья посвящена развитию хостелов как особого типа гостиниц на рынке гостиничного хозяйства Екатеринбурга. Автор статьи выявляет проблемы и предлагает варианты их решения. Также автор определяет дальнейшее развитие хостелов как перспективной составляющей гостиничного бизнеса Екатеринбурга

Symbolic-numeric approach for solving linear differential equations of the fourth order

This paper presents a symbolic-numeric approach for solving linear differential equations of the fourth order in the form of generalized power series. The working program allows to find solutions to differential equations of the fourth order in the form of power series, generally, of any order, but is limited by capabilities of a given computer. Some examples of solving differential equations of the fourth order are presented, which show the efficiency of the developed progra

Working of the mathematical model and structure of system for forecasting of efficiency of investments into innovative projects

Розглянуто систему прогнозування ефективності інвестицій в інноваційні проекти. Представлено її структурну схему та основні функціональні елементи. Наведено математичну модель, що ґрунтується на комплексному підході, який базується на експертному оцінюванні та нейронних мережах.The system of forecasting the effectiveness of investment in innovation is considered. Its block diagram and key functional element is represented. A mathematical model that is based on an integrated method that is based on expert evaluation and neural networks is shown

Structure and properties of lymphocytes’ surfaces in patients with chronic lymphoblastic leucosis

In the investigation that was performed, the authors studied the structure and properties of lymphocytes’ surfaces in patients with chronic lymphoblastic leukemia with application of atomic force microscopy technology. It was stated that development of chronic lymphoblastic leukemia is characterized with circulation of immature forms of lymphocytic series in peripheral bloodstream, for which increase of surface potential by 456% (p<0.05) as compared with control group, is typica