Cobalt(II) and copper(II) complexes with carboxylic acids, imidazole, and 2-methylimidazole

The compositions of [MIm(MeIm)x]L complexes synthesized by the reaction of cobalt(II) and copper(II) fumarates ML · nH2O with imidazole (Im) and 2-methylimidazole (MeIm) were determined. The thermal decomposition of the salts was analyzed, and the pyridine nitrogen atom of imidazole and the oxygen atoms of carboxyl anions were shown to participate in complexation using electronic absorption spectra and IR spectra. The composition and stability of cobalt(II) and copper(II) imidazolatesuccinate complexes in an aqueous solution were determined photometrically and spectrophotometrically, and their higher stability in comparison with monoligand complexes was demonstrated

Получение низкозастывающего дизельного топлива для надёжной работы техники в районах Крайнего Севера и Арктики

In the Republic of Sakha (Yakutia) there are many winter roads for transportation of food and essential goods. As a rule, vehicles are running on a diesel fuel on such roads. Despite the difficulties in operating diesel vehicles under extremely low temperatures, diesel vehicles are much more powerful and economical than gasoline ones. Problems with start and operation of a diesel engine are associated with low-temperature properties of diesel fuel. The process involved in refining oil to create a winter class diesel fuel is expensive and complex because paraffinic hydrocarbons must be removed.Therefore, today it is important to produce winter classes of diesel fuel by compounding a pour point depressant and a summer class of fuel. When using additives, problems arise with the choice of their concentration. Those limits that the manufacturer recommends in real life show a negative result.There is no wide range of those additives in Yakutia so the authors chose for experiments Dewaxol additives that diminish sedimentation during fuel transportation. So, during the study of the impact of Dewaxol additive, that contained amides and imides of mono- and dicarboxylic acids on the diesel fuel, it was considered how, at various concentrations of the additive and the heating temperature of fuel, the cloud point decreases, and sedimentation stability improves. The least squares method has allowed describing optimal concentration of pour point depressant. The study resulted in the conclusion that the fuel with a high content of depressant-dispersant additive has the best sedimentation stability.В Республике Саха (Якутия) функционирует множество автозимников для перевозки продовольствия и товаров первой необходимости. Как правило, по таким дорогам ездят автомобили, работающие на дизельном двигателе. Несмотря на трудности в эксплуатации дизельной техники при экстремально низких температурах, дизельная техника намного мощнее и экономичнее бензиновой. Проблемы с запуском и работой дизельного двигателя связаны с низкотемпературными свойствами дизельного топлива. Процесс переработки нефти для создания зимнего сорта дизельного топлива сопровождается большими затратами и сложной технологией, потому что необходимо удалить парафиновые углеводороды.Поэтому сегодня актуально производство зимних сортов дизельного топлива путём компаундирования депрессорной присадки и летнего сорта топлива. При использовании присадок возникают проблемы с выбором их концентрации. Те пределы, которые рекомендует производитель, в реальной жизни показывают отрицательный результат.В Якутии отсутствует широкий спектр таких присадок, поэтому авторы остановили свой выбор для проведения экспериментов присадках Dewaxol, которые уменьшают отложения при перевозке топлива. В ходе изучения воздействия присадки Dewaxol, в составе которой были амиды и имиды моно- и дикарбоновых кислот, на дизельное топливо было рассмотрено, как при различных концентрациях присадки и температуре нагрева топлива снижается температура помутнения и улучшается седиментационная устойчивость. Метод наименьших квадратов позволил описать оптимальную концентрацию депрессорной присадки. В результате исследования выяснилось, что наилучшей седиментационной устойчивостью обладает топливо с высоким содержанием депрессорно-диспергирующей присадки

Fungal literature records database of the Northern West Siberia (Russia)

Background Mycological research in the Northern part of West Siberia has now become sufficient for review and digitisation as over 460 scientific works have been completed mainly since the beginning of the 20th century. The history of research in the region started from isolated studies at the beginning of the 20th century, but regular and systematic research started from the 1970s. Over the following decades, several dozens of researchers have worked in the area, but the reported occurrences were scattered amongst a broad variety of publications, mainly hardly available. The great need in digitisation and accumulation of fungal records reported in published literature in a standardised regional database has now become evident. The «Fungal records database of the Northern West Siberia» (FuNWS) was initiated in 2016 according to contemporary biodiversity data standards (Darwin Core), to be compatible and accessible by the broad research community. The database has been supplemented ever since by the collective effort of specialists working in the area. According to the database summary report, there are 3358 fungal and fungus-like species revealed in the Northern West Siberia at present. The richest in species number classes are Agaricomycetes (60%) and Lecanoromycetes (33%) with a total of 25 classes represented. The FuNWS database was uploaded to Global Biodiversity Information Facility (GBIF) (Ygra State University Biological Collection publisher) on 11 November 2017 (earlier titled «Fungal Records Database of Yugra, FReDY») to provide open access to the data and its reusability (Filippova et al. 2020). New information This publication summarises the results of the digitisation of literature-based occurrence records of fungi and fungus-like organisms initiated in the Northern part of West Siberia for the first time in the history of mycological research. The bibliography of regional mycological publications was created to include about 460 published works (Suppl. material 2). In total, about 140 literature sources were digitised and about 22000 occurrence records were integrated into the FuNWS database (Filippova et al. 2020). © Filippova N et al.20-04-00349Russian Foundation for Basic Research, Ð Ð¤Ð¤Ð : 18-05-00398Russian Foundation for Basic Research, Ð Ð¤Ð¤Ð : 13-01-20/39, 18-44-860017The research was funded by the Russian Fund for Basic Research and Government of the Khanty-Mansiysk Autonomous region according to the research project 18-44-860017 and grant 13-01-20/39 of the Yugra State University. Anton G. Shiryaev was partially funded by the Russian Foundation for Basic Research No 18-05-00398 А. Elena A. Zvyagina was supported by the KhMAO – Ugra government assignment for Surgut State University №20-04-00349. А. S. Arefyev was supported by the Fundemental research programme of the Tyumen Scientific Center SB RAS VI.52.1. project number AAAA-A17-117050400146-1. The authors are grateful to Ilya Filippov for preparation of a graph

Hydrometeorological dataset of West Siberian boreal peatland: a 10-year record from the Mukhrino field station

Northern peatlands represent one of the largest carbon pools in the biosphere, but the carbon they store is increasingly vulnerable to perturbations from climate and land-use change. Meteorological observations taken directly at peatland areas in Siberia are unique and rare, while peatlands are characterized by a specific local climate. This paper presents a hydrological and meteorological dataset collected at the Mukhrino peatland, Khanty-Mansi Autonomous Okrug – Yugra, Russia, over the period of 8 May 2010 to 31 December 2019. Hydrometeorological data were collected from stations located at a small pine–shrub–Sphagnum ridge and Scheuchzeria–Sphagnum hollow at ridge–hollow complexes of ombrotrophic peatland. The monitored meteorological variables include air temperature, air humidity, atmospheric pressure, wind speed and direction, incoming and reflected photosynthetically active radiation, net radiation, soil heat flux, precipitation (rain), and snow depth. A gap-filling procedure based on the Gaussian process regression model with an exponential kernel was developed to obtain continuous time series. For the record from 2010 to 2019, the average mean annual air temperature at the site was −1.0 ∘C, with the mean monthly temperature of the warmest month (July) recorded as 17.4 ∘C and for the coldest month (January) −21.5 ∘C. The average net radiation was about 35.0 W m−2, and the soil heat flux was 2.4 and 1.2 W m−2 for the hollow and the ridge sites, respectively. The presented data are freely available through Zenodo (https://doi.org/10.5281/zenodo.4323024, Dyukarev et al., 2020), last access: 15 December 2020) and can be used in coordination with other hydrological and meteorological datasets to examine the spatiotemporal effects of meteorological conditions on local hydrological responses across cold regions.</p

Anabar Region of Yakutia in the XX — Early XXI Centuries: Characteristics of the Local Cultural Landscape

The features of the ethnocultural landscape of the Anabar national (Dolgan-Evenk) ulus of the Republic of Sakha (Yakutia) are considered. Attention is paid to the main components of cultural landscapes: local communities and traditional economy. In the study area, the retrospective analysis made it possible to identify the dynamics of the  number and settlement of residents, to state the modern functioning of two rural local communities: Saskylakh  and Yuryung-khainsky. It is argued that the sustainability and preservation of traditional sectors of the economy are due to the adaptation of the local population to natural landscapes. It is noted that during the XX — early XXI centuries, the traditional economic activities of the indigenous population, represented by different ethnic groups  that originally inhabited the territory of the ulus, remained unchanged and, despite all the socio-economic transformations, remain vital and common for the Anabarians. The article presents the results of the analysis of a sociological survey and an associative experiment, which revealed the features of the linguistic landscape of the area under consideration, depending on different layers of self-awareness: external, with a predominance of Russian-language text in the linguistic appearance of the settlements under study; individual, with a predominance of the Yakut language in intergroup communication; and the subconscious, which revealed the dominance of the Dolgan cultural codes. It has been established that the cultural landscape of the Anabar ulus is the result of  centuries-old interaction of indigenous ethnic groups inhabiting this area: Dolgans, Evenks, Yakuts and Russians

Состояние безопасности дорожного движения в Арктической зоне Российской Федерации

The article deals with the issue of road safety in the Arctic zone of the Russian Federation.The analysis of road traffic accidents over the past 10 years that occurred in the Arctic zone of the Republic of Sakha (Yakutia) was carried out for the first time ever. The study refers to the total number of road traffic accidents, accidents due to the fault of pedestrians, accidents due to the unsatisfied condition of streets and roads, accidents involving children under 16 years of age, accidents involving drivers with signs of alcohol intoxication and accidents committed by drivers without the right to drive vehicles. Based on the data obtained, a coefficient K was proposed that characterises the state of road safety in the Arctic regions in comparison with traffic safety in general in the Republic of Sakha (Yakutia).The analysis of road traffic accident statistics has shown that many accidents are the fault of drivers without a driver’s license and revealed the districts with respectively the highest and lowest number of accidents as per their types listed above.Despite the huge territory and the small number of inhabitants, and consequently the low population density, the number of accidents in the Arctic zone of the Republic of Sakha (Yakutia) has been increasing every year necessitating efforts to improve road safety.В статье рассмотрен вопрос по безопасности дорожного движения в Арктической зоне Российской Федерации.Впервые проведён анализ дорожно-транспортных происшествий, произошедших на территории Арктической зоны Республики Саха (Якутия) за последние десять лет. Проанализировано общее количество ДТП, ДТП по вине пешеходов, ДТП из-за неудовлетворительного состояния улиц и дорог, ДТП с участием детей до 16 лет, ДТП с участием водителей с признаками опьянения и ДТП, допущенных водителями без права на управление транспортными средствами.На основе полученных данных был предложен коэффициент «К», который характеризует состояние безопасности дорожного движения в Арктических районах по сравнению с безопасностью движения в целом по Республике Саха (Якутия).Проведённый анализ статистики ДТП показал, что большое количество ДТП происходит по вине водителей без прав на управление транспортными средствами. Также были выявлены районы с наиболее высоким и низким количеством произошедших ДТП по перечисленным выше видам. Несмотря на огромную территорию и небольшое число жителей, а, соответственно, и низкую плотность населения, количество ДТП в Арктической зоне Республики Саха (Якутия) увеличивается с каждым годом, что диктует целесообразность проведения мероприятий по повышению безопасности дорожного движения

Optical Identification of Four Hard X-ray Sources from the Swift All-Sky Survey

We present the results of our optical identifications of four hard X-ray sources from the Swift all-sky survey. We obtained optical spectra for each of the program objects with the 6-m BTA telescope (Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz), which allowed their nature to be established. Two sources (SWIFT J2237.2+6324} and SWIFT J2341.0+7645) are shown to belong to the class of cataclysmic variables (suspected polars or intermediate polars). The measured emission line width turns out to be fairly large (FWHM ~ 15-25 A), suggesting the presence of extended, rapidly rotating (v~400-600 km/s) accretion disks in the systems. Apart from line broadening, we have detected a change in the positions of the line centroids for SWIFT J2341.0+7645, which is most likely attributable to the orbital motion of the white dwarf in the binary system. The other two program objects (SWIFT J0003.3+2737 and SWIFT J0113.8+2515) are extragalactic in origin: the first is a Seyfert 2 galaxy and the second is a blazar at redshift z=1.594. Apart from the optical spectra, we provide the X-ray spectra for all sources in the 0.6-10 keV energy band obtained from XRT/Swift data.Comment: 9 pages, 6 figures, will be published in Astronomy Letters, 38, No.5, pp.281-289 (2012

DIAGNOSTIC MARKERS OF ALLERGIC BRONCHOPULMONARY ASPERGILLOSIS IN PATIENTS WITH BRONCHIAL ASTHMA

Studies of probable significance of different immunological mediators for the development of chronic allergic inflammation in patients with allergic bronchopulmonary aspergillosis (ABPA) are necessary in order to specify potential targets for therapeutic intervention and timely diagnosis of the disease. The purpose of present study was to determine the features of immune response regulation, and to identify diagnostic markers associated with development of ABPA in patients with bronchial asthma, and to evaluate clinical and immunological efficacy of specific antimycotic therapy.The study involved 13 patients with ABPA, 14 patients with bronchial asthma with fungal sensitization (BAFS), 17 patients with bronchial asthma (BA) and 12 apparently healthy individuals. Levels of thymic stromal lymphopoietin (TSLP), thymus and activation-regulated chemokine (TARC), IL-8, as well as levels of total IgE and specific IgE to Aspergillus fumigatus (A. fumigatus) were measured in blood serum by enzyme immunoassay; blood eosinophil counts were also made. Monitoring of these immunological markers in the course of antimycotic therapy was carried out.Significantly higher numbers of eosinophils, increased levels of total IgE and sIgE for A. fumigatus, as well as TARC and IL-8 in serum were revealed in patients with ABPA when compared to the patients with BA. No significant differences in TSLP content were found between the examined groups of patients. A positive correlation between the levels of sIgE to A. fumigatus and contents of TARC and IL-8, numbers of eosinophils, and total IgE levels confirms the important diagnostic value of proinflammatory cytokines in ABPA patients. In the course of itraconazole medication, a positive clinical and immunological dynamics in ABPA patients was revealed. After 12 weeks of therapy, a significant increase in AST, FEV1 and Tiffno respiratory indexes, along with decreased number of eosinophils, total IgE levels, and a trend towards a decrease in TARC and IL-8 levels were documented. This dynamics confirms clinical efficiency of antifungal drugs when treating chronic allergic inflammation in ABPA patients.Implementation of modern immunological biomarkers, alongside with traditional indicators, will allow to differentially evaluate a probability for ABLA development in patients with bronchial asthma, to present additional evidence for discerning early stages of the disease, and to conclude about the efficiency of the therapy applied

Fast optical variability of SS 433

We study the optical variability of the peculiar Galactic source SS 433 using the observations made with the Russian Turkish 1.5-m telescope (RTT150). A simple technique which allows to obtain high-quality photometric measurements with 0.3-1 s time resolution using ordinary CCD is described in detail. Using the test observations of nonvariable stars, we show that the atmospheric turbulence introduces no significant distortions into the measured light curves. Therefore, the data obtained in this way are well suited for studying the aperiodic variability of various objects. The large amount of SS 433 optical light curve measurements obtained in this way allowed us to obtain the power spectra of its flux variability with a record sensitivity up to frequencies of ~0.5 Hz and to detect its break at frequency =~2.4e-3 Hz. We suggest that this break in the power spectrum results from the smoothing of the optical flux variability due to a finite size of the emitting region. Based on our measurement of the break frequency in the power spectrum, we estimated the size of the accretion-disk photosphere as 2e12 cm. We show that the amplitude of the variability in SS 433 decreases sharply during accretion-disk eclipses, but it does not disappear completely. This suggests that the size of the variable optical emission source is comparable to that of the normal star whose size is therefore R_O \approx 2e12 cm \approx 30 R_sun. The decrease in flux variability amplitude during eclipses suggests the presence of a nonvariable optical emission component with a magnitude m_R=~13.2.Comment: 12 pages, 11 figures. Accepted for publication in Astronomy Letters. The original version in Russian is available at http://hea.iki.rssi.ru/rtt150/ru/ss433_pazh10/pss433_fast.pd