Биология

Using the model of silt sediments of different ages and soils contaminated with oil products, the utilizing ability of the saprophytic bacterium Bacillus pumilus was studied. It was established that 7 days after the introduction of silt sediment samples of B. pumilus culture into the samples, there was an increase in the mass concentration of copper, cadmium and lead ions, followed by a decrease in the dynamics after 21 days of bacterial exposure. The mass concentration of zinc ions in the sludge samples decreased in dynamics over the entire duration of the experiment.

The article presents the results of the study of morphometric and physiological parameters of the leaves of the woody plant-chestnut oak (Quercus castaneifolia S. A. Mey.). The study was conducted in Baku, which is the capital of the Republic of Azerbaijan, to assess the bioindicative properties and prospects of using this plant in environmental monitoring and landscaping of the city. To conduct a comparative analysis of the results, leaf samples were collected in the areas of the city that differ in the degree of environmental pollution.

Allium ramosum L. – type species of the subgenus Butomissa (Salisb.), Section Butomissa. The species has a fairly high seed productivity, which varies widely. This article presents the results of a study of seed productivity under the conditions of artificial phytocenosis of the Moscow Region in four commercial varieties of A. ramosum. In alluvial meadow soils, fruit setability was 88.9–95.8%, real seed productivity was fixed at 3.5–18.5 g/plant, 1000 seeds weight was 4.2–5.9 g. Average insemination was noted 3, 0–5.9 pieces/fruit.

The object of the study was sprouts of spring soft wheat Triticum aestivum L. Cultivation was carried out in a climatic chamber at a temperature of 18 ± 1°C under the conditions of a sixteen-hour photoperiod and complete etiolation. The experiment was carried out in the following options: removed the main germinal root; decapitation; removed the lower tier of germinal roots. Removing part of the root system of plants cultivated under a sixteen-hour photoperiod increases the root index and reduces the total length of the root system.

The article presents the results of the search for the optimal hormonal composition of the nutrient medium for the induction of direct organogenesis in the culture of mature embryos of the maize homozygous line ATTM (bm, wx, y). The mature embryos isolated from kernels were used as the primary explant. The 11 media variants were tested for induction of direct organogenesis: MS without hormones (control) and with phytohormones in different concentrations and combinations.

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.

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.

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).

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 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).