Biology

Development of female hametophytis and embryogenesis of introduced species Picea A. Dietr. in the Taiga Zone (Karelia)

The aim of the research was to establish features in macrosporogenesis, macrogametogenesis, and embryogenesis in Picea species (native species P. abies and introduced species P. canadensis and P. pungens) in the Botanical Garden of Petrozavodsk State University (middle taiga subzone). To study the development of the generative sphere, shoots with generative buds and strobiles from the southwestern side of the crown were cut from 10 trees and fixed in a mixture of alcohol and glycerin. The development of the female gametophyte and the embryo was studied with constant preparations.

Complex Assessment of the Viability and Decorativeness of Species of the Genus Crataegus L. in the Kola North Conditions

Authors: Goncharova O. A., Zotova O. E.

The paper presents the results of a comprehensive assessment of the viability and decorativeness of 20 samples of 17 taxa of the genus Crataegus L. when introduced into the Kola North. The study is one of the stages of a systematic description of the adaptive state of plants of the genus Crataegus when introduced into the conditions of the Far North. The main part of the studied samples are highly decorative quite viable plants that have high winter hardiness, maintain their growth shape, are able to produce germinating seeds, and have attractive inflorescences and fruits. C.

The Features of Growth of the Primary Root System of Triticum durum Desf. Varieties of the Saratov Breeding

Authors: Hachaturov E. G., Korobko V. V.

The objects of the study were plants of 14 varieties of durum wheat Triticum durum Desf. Cultivation was carried out in a climatic chamber at a temperature of 18 ± 1°C under the conditions of a sixteen-hour photoperiod. To study the growth characteristics of the root system of seedlings, the length of the main root and the length of the adventitious roots of the upper and lower tiers were measured; thus, the growth rate of the root system was determined.

Chlorophyllin Inhibits Chemiluminescence That Accompanies a Quasi-Hypoxygenase Reaction Catalyzed by the Cytochrome c-Cardiolipin Complex

Authors: Romodin L. A.

Lipid peroxidation is a key factor in programmed cell death of various etiologies. This process also occurs when ionizing radiation acts on biological systems. It is the essence of the theory of lipid radiotoxins, which is part of the structural and metabolic theory of the biological action of ionizing radiation. Non-enzymatic lipid peroxidation eventually leads to death by the mechanism of ferroptosis, while enzymatic lipid peroxidation, catalyzed by the cytochrome c-cardiolipin complex, triggers apoptosis along the mitochondrial pathway.

Biological Features of Gladiolus hybridus in Connection with the Adaptation of the Siberian Region

Authors: Sedelnikova L. L., Vorobyova I. G.

The adaptive possibilities of the varietal diversity of Gladiolus hybridus in the forest-steppe zone of Western Siberia are analyzed. Morphobiological features of shoot formation are shown. Long-term (1999–2019) results of seasonal development of plants in generative age state are presented. The specificity of the terms of flowering varies from different groups of the sum of positive temperatures. Flowering in Novosibirsk occurs in early varieties with the sum of positive temperatures >1462° C, medium >1558° C, late >1711° C.

Dependence of Taxonomic Flora Parameters on Sample Sizes

Authors: Ivanova A. V., Kostina N. V., Aristova M. A.

The problem of assessing the completeness of the identification of flora is a very significant element of study. The approach proposed in this work is based on an assessment of the complex of parameters of the taxonomic spectra of flora (generic and family). As a model object, the authors considered the flora of the Soksky physical-geographical region, located in the Trans-Volga sector of the Samara region. To solve this problem, the authors used 124 source floristic lists and their combinations (over 400).

The Poa bulbosa L. Reproductive Strategy in the Steppe Phytocenoses of the Lower Volga Region

Authors: Kaybeleva E. I., Arkhipova E. A., Yudakova O. I., Voronin M. Y.

Poa bulbosa L. is a native cereal of the European and Mediterranean flora and an invasive species in North America. The study of its reproductive strategy in different environmental and climatic conditions is important for the development of effective methods of containment and prevention of invasions. Plants of two coenopopulations were investigated embryologically. In addition, the morphology of reproductive organs was analyzed in 175 herbarium specimens collected in the flora of the Lower Volga region from 1919 to 2017.

The Study of Lymphatic Draina ge Function of the Brain After Opening the Blood-Brain Barrier and During Drugged Sleep

Authors: Zinchenko E. M., Klimova M. M., Khorovodov A. P., Agranovich I. M., Esma S. A., Terskov A. V., Dubrovsky A. I., Shirokov A. A., Mamedova A. T., Blohina I. A., Lezhnev N. D., Romashchenko A. V., Tuchin V. V., Semyachkina-Glushkovskaya O. V.

In studies on male adult rats, the activation of the functions of the lymphatic system of the brain (LSM) was studied during drugged sleep and after the opening of the blood-brain barrier (BBB) by sound. The cleaning and drainage functions of LSM were studied by removing contrast agents from the brain in real time using magnetic resonance imaging (MRI) and optical coherence tomography (OCT).

Some Features of the Biology of Invasive Species Conyza canadensis (L.) Cronq. in the Abkhazia Republic

Authors: Gergiya L. G., Aiba E. A., Abramova L. M., Mustafina A. N.

The invasion of aggressive adventive plants in the territory of the Abkhazia Republic has a significant impact on the loss of biodiversity and the imbalance of ecosystems. In this regard, monitoring of the invasive component of flora is an urgent task. The aim of work was to study the biological features of invasive species Conyza canadensis under the conditions of Abkhazia. The research objectives included the study of morphometric parameters of the species and their variability.

New Gypsum-Titanium Composites for Antimicrobial Photocatalytic Action on Staphylococcus aureus

Authors: Tuchina E. S., Korchenova M. V., Svetlakova A. V., Kordas K., Tuchin V. V.

The last decade has allowed the creation of new composite photocatalytic materials with a wide range of applications. Antimicrobial coatings based on photocatalytic materials are environmentally friendly and effective for use in health care, the food industry, enterprises and service facilities. This study is devoted to the study of the antibacterial activity of gypsum-titanium nanocomposites.

Biology

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