Izvestiya of Saratov University.
ISSN 1816-9775 (Print)
ISSN 2541-8971 (Online)


Биология

Features of development of generative structures of some fl owering plants

The paper presents the results of a comparative study of the reproductive biology of a number of Crimean fl ora species and valuable plants introduced to the south of Russia belonging to various families (Magnoliaceae, Annonaceae, Ericaceae, Campanulaceae, Anacardiaceae, Lamiaceae, Ranunculaceae, Davidiaceae, Nyssaceae, Onagraceae, Papaveraceae), which made it possible to establish some features and regularities in the formation of the generative structures of the reproductive system, consisting in the conjugation of the development of male and female elements, the matu

Видовой состав макрозообентоса водоемов национального парка «Хвалынский» (Саратовская область, Россия)

В составе макрозообентоса водоёмов охраняемой и рекреационной зон Национального парка «Хвалынский» был отмечен 77 таксонов гидробионтов: олигохет – 3, пиявок – 3, двустворчатых моллюсков – 2, брюхоногих моллюсков – 7, ракообразных – 2, водяных клещей – 1, личинок веснянок – 1, личинок поденок – 4, личинки стрекоз – 7, личинок жесткокрылых – 4, личинок полужесткокрылых – 2, личинок чешуекрылых – 1, личинок горбаток – 1, личинок большекрылых – 1, личинок комаров-звонцов – 29, личинки перистоусых комаров – 1, личинок болотниц – 1, личинок львинок – 1, личинок бабочниц – 1,

Эктацитометрия: Определение характеристик эритроцитов жителей ХМАО-Югры на фоне употребления природного цеолита

Исследовано влияние диеты, содержащей природный цеолит (клиноптилолит) на деформируемость красных клеток крови добровольцев обоих полов, широкого возрастного диапозона, проживающих в ХМАО-Югре (г. Ханты-Мансийск). Способность эритроцитов к упругой деформации исследовалась с помощью метода лазерной дифрактометрии, заключающегося в получении дифракционной картины от тонкого слоя суспензии эритроцитов, находящейся в сдвиговом потоке, и последующей цифровой обработки распределения интенсивности дифрагированного поля.

Optimization of phage display technology for obtaining antibodies specific to tetracycline

Large-scale production and use of antimicrobials in human, veterinary and agricultural applications has led to antibiotic contamination of water resources. Therefore, it is relevant to develop methods for monitoring the content of antibiotics, especially in water resources. Biosensor methods are successful for the analysis of antibiotics. One of the main elements of a biosensor system is the selection of a recognition element.

Dynamics of formation of tolerance to blue (405 nm) led radiation in Staphylococcus aureus upon repeated exposure

In this work, we studied the development of tolerance to low-intensity violet (405 nm, 80 mW/cm2 , 72 J/cm2 ) LED radiation in a clinical antibiotic-resistant strain of Staphylococcus aureus 2a. The change in numbers during 20 cycles of irradiation was studied, the reaction of bacterial cells to oxidative stress was studied – sensitivity to the presence of hydrogen peroxide in the environment and catalase activity.

Formation of Langmuir monolayers from native phospholipids of bacteria of various systematic groups

Phospholipids are the most important structural elements of the bacterial cell wall, participate in the adaptation of microorganisms to the environment and can act as biomarkers for environmental changes and one of the components of environmental monitoring. Native phospholipids are used to form models of cell membranes, the biophysical properties of which can be studied by the Langmuir-Blodgett method.

Combination ability of new dihaploid corn lines in the conditions of the Right Bank of the Saratov region

Dihaploid lines, or lines obtained on the basis of doubled haploids, are a valuable material for the creation of high-heterosis corn hybrids. The most eff ective method of evaluating the starting material when selecting parental couples for obtaining hybrids is diallell analysis. The article presents the results of the analysis of indicators of 6 dihaploid corn lines and 30 simple corn hybrids of the dialle scheme. The combinative ability of lines along the stem length, the cob attachment height, and the panicle length was studied.

On the distribution of Allium caeruleum and A. regelianum (Alliaceae Borkh.) in the territory of the Saratov region

Concerning the distribution of Allium caeruleum Pall. and A. regelianum A. K. Becker, recent literary sources provide confl icting information. Based on the data from the doctoral dissertation of A. O. Tarasov, the results of expeditionary research and our own herbarium collections, it is stated that Allium caeruleum is distributed in the Ozinsky (at least in the vicinity of the village of Nepryakin) and in the Aleksandrovo-Gaisky (at least in the vicinity of the village of Kamyshki) districts of the Saratov region. The presence of A.

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