Lyubov Ivanova

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Changes in the structural characteristics of mesophyll induced by shading were investigated in ten species of wild plants of diverse functional types. In all plant types, shading reduced leaf thickness and density by 30–50% and total surface of mesophyll, by 30–70%. The extent and mechanisms of mesophyll structural rearrangement depended on the plant(More)
Structural characteristics of the mesophyll were studied in five boreal grass species experiencing a wide range of light and water supply conditions. Quantitative indices of the palisade and spongy mesophyll tissues (cell and chloroplast sizes, the number of chloroplasts per cell, the total cell and chloroplast surface area per unit leaf surface area) were(More)
Functional activity of polymorphonuclear neutrophils (PMN) was tested in 63 HIV-1 infected patients. PMN chemiluminescence (CL) and intracellular enzyme activity were both depressed in patients at all stages of infection, though this depression was more pronounced in AIDS patients. We found no such depression when cells were incubated in the presence of(More)
We present our experience in applying distributional semantics (neural word embeddings) to the problem of representing and clustering documents in a bilingual comparable corpus. Our data is a collection of Russian and Ukrainian academic texts, for which topics are their academic fields. In order to build language-independent semantic representations of(More)
A detailed quantitative analysis of the three-dimensional organization of the mesophyll was performed, and mesophyll diffusion resistance to CO2 in the leaves of Chamaerion angustifolium formed under different irradiance was calculated using an original method of stereometric cellular packing. For each type of leaves (sun and shade), we determined(More)
Morphometric parameters of mature leaves (area, venation density, and shape coefficient) and trunks (size and biomass) of two edificatory birch species, Betula pendula Roth and B. pubescens Ehrh., were characterized. These species inhabit a 1600-km transect of the Urals, from forest-tundra to forest-steppe. In both species, the highest trunk biomass was(More)
430 The specific surficial density of a leaf (SSDL or dry weight of the leaf area unit) is a fundamental charac teristic of a plant [1, 2] and is used in global models of the Earth’s vegetation [3]. The SSDL is related to many aspects of plant growth and development [4] and correlates with such parameters as the level of net pho tosynthesis [5], content of(More)
Changes in some leaf characteristics: leaf mass area (LMA), content of photosynthetic pigments and nitrogen in the leaves, leaf mass ratio (LMR) and leaf area ratio (LAR) were investigated in steppe plants of the Volga land along the gradient of aridity. When drought stress became stronger, the content of chlorophylls in the leaves, LMR and LAR decreased,(More)
The isotope ratios δ13C and δ15N and the contents of nitrogen, carbon, and mineral substances have been studied in the leaves of Ephedra sinica, Allium polyrhizum, and Stipa glareosa plants growing separately or together under arid conditions of the Gobi (Mongolia). The contents of nitrogen, mineral substances, and δ15N have proved to decrease when these(More)