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Обоснование. Цианобактерия Arthrospira (Spirulina) platensis (спирулина) обладает уникальным биохимическим составом и находит широкое применение в различных сферах, в том числе в медицине и сельском хозяйстве. Основные фикобилипротеины (ФБП) спирулины – С-фикоцианин и аллофикоцианин защищают клетки животных от окислительного стресса и дисфункции митохондрий. В то же время мало сведений об антиоксидантных свойствах ФБП в растительной клетке и их влиянии на биоэнергетические параметры митохондрий растений. Цель. Целью данной работы было изучение влияния экстракта ФБП A. platensis на глюкозооксидазную активность и функционирование митохондрий картофеля. Материалы и методы. ФБП выделяли из сырой биомассы A. platensis (Nordstedt) Gomont (штамм IBSS–31) с помощью холодной экстракции и осаждения ацетоном. Белковый экстракт с высокой долей С-фикоцианина использовали в концентрациях 0,025 – 0,25 мг/мл. Об антиоксидантных свойствах ФБП судили по ингибированию глюкозооксидазной активности экстрактов картофеля с повышенной экспрессией гена GOX. Окислительную и фосфорилирующую активность митохондрий в присутствии ФБП оценивали полярографическим методом. Статистическую обработку данных осуществляли с помощью SigmaPlot v. 14.0. Результаты. Глюкозооксидазный тест выявил антиоксидантную активность экстракта ФБП, ярко выраженную при концентрации белка 0,25 мг/мл. В этой же концентрации экстракт вызывал разобщение процессов окисления и фосфорилирования в митохондриях картофеля при окислении сукцината, связанное с повышением скорости дыхания в состоянии 4 и снижением коэффициента дыхательного контроля. Заключение. Таким образом, фикобилипротеины A. platensis концентрационно-зависимым образом снижают генерацию пероксида водорода в глюкозооксидазной тест-системе и разобщают процессы окисления и фосфорилирования митохондрий растений.

In this work, we studied the influence of cold acclimation (first stage – 8 °С/2 °С for 10 days and second stage – subsequence action of -2 °С for 10 days) and deacclimation (10 °С for 2 days) on the content of soluble carbohydrates and the synthesis of dehydrins in leaves of two variety of winter wheat (Triticum aestivum L.) that are differed in frost resistance. It is detected that the winter wheat of Irkutskaya variety and Pamyat variety are differed in the dynamics of accumulation and content of dehydrins in leaves. The most frost resistant Irkutskaya is characterized by a higher content of dehydrins in the leaves during acclimation and deacclimation, compared with the less frost resistant Pamyat.

In this study, a novel supramolecular composite, “photogels”, was synthesized by mixing of cysteine–silver sol (CSS) and methylene blue (MB). A complex of modern physico-chemical methods of analysis such as viscosimetry, UV spectroscopy, dynamic and electrophoretic light scattering, scanning electron microscopy and energy-dispersive X-ray spectroscopy showed that MB molecules are uniformly localized mainly in the space between fibers of the gel-network formed by CSS particles. Molecules of the dye also bind with the surface of CSS particles by non-covalent interactions. This fact is reflected in the appearance of a synergistic anticancer effect of gels against human squamous cell carcinoma even in the absence of light irradiation. A mild toxic influence of hydrogels was observed in normal keratinocyte cells. Photodynamic exposure significantly increased gel activity, and there remained a synergistic effect. The study of free-radical oxidation in cells has shown that gels are not only capable of generating reactive oxygen species, but also have other targets of action. Flow cytometric analysis allowed us to find out that obtained hydrogels caused cell cycle arrest both without irradiation and with light exposure. The obtained gels are of considerable interest both from the point of view of academics and applied science, for example, in the photodynamic therapy of superficial neoplasms.

Supramolecular hydrogels based on low-molecular-weight compounds are a unique class of so-called “soft” materials, formed by weak non-covalent interactions between precursors at their millimolar concentrations. Due to the variety of structures that can be formed using different low-molecular-weight gelators, they are widely used in various fields of technology and medicine. In this study, we report for the first time an unusual self-assembly process of mixing a hydrosol obtained from L-cysteine and silver nitrate (cysteine–silver sol—CSS) with sodium halides. Modern instrumental techniques such as viscosimetry, UV spectroscopy, dynamic light scattering, zeta potential measurements, SEM and EDS identified that adding fluoride anions to CSS is able to form stable hydrogels of a thixotropic nature, while Cl−, Br− and I− lead to precipitation. The self-assembly process proceeds using a narrow concentration range of F−. An increase in the fluoride anion content in the system leads to a change in the gel network morphology from elongated structures to spherical ones. This fact is reflected in a decrease in the gel viscosity and a number of gel–sol–gel transition cycles. The mechanism of F−’s interaction with hydrosol includes the condensation of anions on the positive surface of the CSS nanoparticles, their binding via electrostatic forces and the formation of a resulting gel carcass. In vitro analysis showed that the hydrogels suppressed human squamous carcinoma cells at a micromolar sample concentration. The obtained soft gels could have potential applications against cutaneous malignancy and as carriers for fluoride anion and other bioactive substance delivery.

Herein, the problem concerning the poorer mechanical properties of gels based on low molecular weight gelators (LMWGs)—L-cysteine and silver nitrate—was solved by the addition of various polymers—polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP) and polyethylene glycol (PEG)—to the initial cysteine–silver sol (CSS). The physicochemical methods of analysis—viscosimetry, UV spectroscopy, DLS, and SEM—identified that cysteine–silver hydrogels (CSG) based on PVA possess the best rheological properties and porous microstructure (the average pore size is 2–10 µm) compared to gels without the polymer or with PVP or PEG. Such gels are able to form cysteine–silver cryogels (CSC) and then porous cysteine–silver films (CSF) with an average pore size of 10–20 µm and good mechanical, swelling, and adhesion to skin characteristics as long as the structure of CSS particles remains stable. In vitro experiments have shown that hydrogels are non-toxic to normal human fibroblast cells. The obtained materials could potentially be applied to regenerative medicine.

In this study, novel anion photo-responsive supramolecular hydrogels based on cysteine–silver sol (CSS) and iodate anions (IO3−) were prepared. The peculiarities of the self-assembly process of gel formation in the dark and under visible-light exposure were studied using a complex of modern physico-chemical methods of analysis, including viscosimetry, UV spectroscopy, dynamic light scattering, electrophoretic light scattering, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. In the dark phase, the formation of weak snot-like gels takes place in a quite narrow IO3− ion concentration range. The visible-light exposure of these gels leads to an increase in their viscosity and dramatic change in their color. The morphology of gels alters after light irradiation that is reflected in the formation of a huge number of spherical/elliptical particles and the thickening of the fibers of the gel network. The interaction of CSS with IO3− anions has features of a redox process, which leads to the formation of silver iodide/silver oxide nanoparticles inside and on the surface of CSS particles. CSS possesses selectivity only to IO3− anions compared to many other inorganic ions relevant for humans and the environment. Thus, the CSS/IO3− system is non-trivial and can be considered as a novel low-molecular-weight gelator with photosensitive properties, as another way to produce silver iodide nanoparticles, and as a new approach for IO3− ion detection.

Wheat is one of the agricultural crops that is subjected to temperature stress during ontogenesis and it is especially sensitive to action of the stress at the initial stages of wheat development. High temperatures restrict of growth, development and plant productivity. However, plants can to acclimate to temperature stress and have the adaptive mechanisms at the cellular and molecular levels. One of this adaptive mechanism is an increase of the synthesis of the heat shock proteins (HSPs), which functions are very important and various. The aim of this study was to determine the influence of different heat treatments (37 and 39 ºC for 1, 3, 6, 24 h and 50 ºC for 1, 3, 5 h) on the heat tolerance in spring wheat seedlings (Triticum aestivum L.) and synthesis of the HSPs (101, 70, 60 and 16.9 kDa) in shoots of the 4-day-old seedlings and leaves of the 8-day-old seedlings. Based on the findings, it is concluded that the 4-day-old and 8-day-old spring wheat seedlings are characterized by a similar response to heat stress at 50 ºC, however, 4-day-old seedlings are more resistant in the initial period of stress influence. The exposures at 37 and 39 ºC are suitable for acclimation of spring wheat at the initial stages of development (the 4-day and 8-day-old seedlings). These temperatures lead to a similar trend in the heat resistance of seedlings and the synthesis of HSPs in shoots and leaves. At the same time the content of HSP16.9 depends on the developmental stage of wheat. It is noted the synthesis of HSP16.9 in shoots, but not in leaves under normal conditions. It is concluded that the heat acclimation of the 8-day-old seedlings is a longer process (6-24 h of exposure at 37 and 39 ºC) compared with the 4-day-old seedlings (3-6 h of exposure at 37 and 39 ºC).