This work reviews the relation of the grain-size distribution and impact of the use of rice rotation soils on the main agrophysical indicators of soils that determine the composition and properties ...of soil cover of modern delta of Kuban. The regularities of dependence between the density of the matrix soil and the grain-size distribution that consist of mineral composition of alluvial soils and rocks have been identified. The trend towards increase in soil density with increase in physical clay and silt content, as well as increase in matrix soil density has been established. No significant differences in agrophysical properties of subsurface soil horizons and underlying formations have been identified. The agrophysical indicators of soils of rice fields and boharic analogues during their agricultural use have been assessed. The hydromorphic soil-forming processes did not lead to considerable changes in agrophysical properties of alluvial formations and soils involved in rice rotation.
The work presents the observational data of soil cover structure dynamics, changes in soil composition and properties under the influence of anthropogenic impact. A decrease of 6.0-7.4% in the share ...of black soils (Chernozem) over 50 years of observations and a corresponding increase in the area of waterlogged soils associated with closed depressions have been revealed. Due to the high dynamism of soil density with changes in its moisture content, a criterion has been sought to characterize this dependence and a method has been proposed to describe it using dynamic curves. The amplitude of density fluctuations and its dependence on the severity of anthropogenic degradation – 59 -78% – has been established. Correlation analysis confirmed a medium strength relationship (determination coefficient 0.39-0.42) between shrinkage and specific surface area of initial degradation soils and a strong relationship (determination coefficient 0.79-0.86) in meadow-chernozem compacted soils. A strong correlation has been found between the volumetric shrinkage and fines content in the size distribution (determination coefficient 0.84-0.96). A new diagnostic criterion (“T” criterion) for the intensity of hydrometamorphism and, in general, for the physical aspect of anthropogenic soil degradation has been proposed.
The article represents a translated, revised, and updated excerpt from the book
Electroluminescent Organic Light-Emitting Diodes Based on Metal Coordination Compounds
, Rostov-on-Don: Yuzhn. Fed. ...Univ., 2015; ISBN 978-5-9275-1469-4 (see Additional Information). The measurement of performance characteristics of organic light-emitting diodes (OLEDs), including current–voltage, luminance–voltage, and spectral characteristics is described in detail in relaton to the laboratory measuring facility existing at the Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences. A detailed description of this setup, including the essential minimum set of instruments required for characterizing OLEDs, can serve as a guide for researchers embarking on experiments in the field of electroluminescence. The second part of the article describes the principal limiting factors for OLED efficiency.
The article represents a translated, revised, and updated excerpt from the book
Electroluminescent Organic Light-Emitting Diodes Based on Metal Coordination Compounds
, Rostov-on-Don: Yuzhn. Fed. ...Univ., 2015; ISBN 978-5-9275-1469-4 (see Additional Information). The main technological stages for manufacturing of laboratory samples for electroluminescence are described in general terms. The most popular laboratory techniques for the formation of thin semiconducting organic films, such as solution spin coating and vacuum thermal deposition, are considered in more detail. Some methodological approaches used in our laboratory are outlined. Measurements of the polymer layer thickness by the interference method and by atomic force microscopy are considered in detail. For the interference method, the principal sources of systematic errors are examined. Concerning atomic force microscopy (AFM), two techniques for measuring thickness are considered: the express technique (macro-needle scratching) and scratching with an AFM probe in contact mode. Systematic errors associated with the first technique are determined, followed by recommendations regarding its potential application. The last section highlights the necessary adjustment for calibrating thickness sensors during film deposition if the calibration is conducted based on macro-needle scratching results.
We have studied the influence of the stage of decomposition and acidity of wood, as well as the illumination of the microhabitat on the species composition, abundance, and occurrence of slime molds ...(Myxomycetes) of the xylobiontic (inhabitants of the wood) substrate complex of forest communities in Siberia (Altai krai, Altai Republic, and Novosibirsk oblast). This work is based on a study of 1777 samples of fruit bodies (sporophores) of myxomycetes. In the analysis of data for communities of Myxomycetes of the xylobiontic substrate complex, we recognize a successional series which clearly correlates with the stage of wood decomposition. The study of the distribution of the species composition of the slime mold on wood of various stages of decomposition shows that the maximum number of species is observed on dead trunks where the wood is of medium density and the bark can easily be separated (W3). The lowest specificity and diversity of species composition is observed on the fallen trunks of trees with very dense wood and dense bark (W1). These dead trees have low water-retaining capacity, tight bark, and almost intact wood containing large amounts of lignin, preventing the invasion of plasmodia and myxamoebae of Myxomycetes into the trunk. A study of the location of slime-mold colonies in relation to the illumination level shows that the greatest number of species is found on the front, side, and bottom parts of dead trunks of woody plants. The least specificity and the least variety of Myxomycetes species are found on apical parts of dead tree trunks facing the sun. The exception are species with large fruit bodies such as
Fuligo septica
and
Reticularia splendens
, which are most often observed on the upper parts of the sun facing trunks of woody plants. In the research area, the complex of species typical for wood of coniferous trees is described. It is noted that acidophilic slime molds of the genera
Comatricha
and
Cribraria
can be traced in xylobiontic and epiphytic–corticuloid substrate complexes.
New cryptogamic records. 12 Kotkova, V. M.; Afonina, O. M.; Androsova, V. I. ...
Novosti sistematiki nizs̆ih rastenij,
10/2023, Letnik:
57, Številka:
2
Journal Article
Recenzirano
First records for Russia of naviculoid diatom from the Yaroslavl Region, and micromycetes from the Republic of North Ossetia — Alania, green alga for the Leningrad Region and Yamal-Nenets Autonomous ...Area, fragilarioid diatom for the Kaliningrad Region, red alga for the Nizhny Novgorod Region, cyanoprokaryota for the Leningrad Region and Chukotka Autonomous Okrug, and crustaceous red alga for the Autonomous Republic of Adjara of Georgia, macromycetes for the Leningrad Region, Khanty-Mansi Autonomous Area — Yugra, Republic of Tuva, Trans-Baikal Territory, myxomycetes for the Trans-Baikal Territory, lichens and allied fungi for the Murmansk and Tver regions, republics of Karelia and Tuva, Yamal-Nenets Autonomous Area, Altai and Khabarovsk territories, cyanolichen for the Urals and the Orenburg Region, mosses for the Lipetsk Region, republics of Ingushetia and Buryatia, Krasnoyarsk and Trans-Baikal territories are presented. The data on their localities, habitats, distribution are provided. The specimens are kept in the herbaria ALTB, GSU, IBIW, IRK, KPABG, LE, MHA, MW, NNSU, NSK, PZV, TBI, UUH, VU, YSU, and the Diatom collection of the Laboratory for Algology of IBIW RAS. Sequences of 16S, and 16S–23S ITS cyanobacterial RNA regions, ITS1-5.8S-ITS2 fungal and ITS1-2 moss nrDNA regions of some specimens have been deposited in the GenBank.
In this study, for the first time, we present a systematic study of the critical current density
J
c
at two magnetic field orientations
and
in a single crystal of the superconducting pnictide EuCsFe
...4
As
4
, which shows a magnetic ordering below
T
c
and belongs to the 1144 family. The anisotropy of
J
c
and its temperature dependence are determined. The exponents
of the
dependences from 0.1 to 1 T are in a good agreement with the theoretical predictions for strong Abrikosov vortex pinning, which is also confirmed by the values of the pinning strength estimated using the Dew-Hughes model.
The year 2016 marked the 50th anniversary of the discovery by S. Osaki who first showed that ceruloplasmin (CP, ferro:O
2
-oxidoreductase or ferroxidase) is capable of oxidizing Fe(II) to Fe(III) and ...favors the incorporation of the latter into transferrin (TF). However, much debate remains in the literature concerning the existence of a complex between the enzyme oxidizing iron and the protein facilitating its transport in plasma. We studied CP in exocrine fluids and demonstrated its high-affinity interaction with transferrin found in breast milk and in lacrimal fluid, i.e. with lactoferrin (LF). Here we present data obtained by comparing the interaction of CP with LF and TF using surface plasmon resonance and Hummel–Dreyer chromatography. Binding of apo-LF within the range of concentrations 1.6-51.3 μM with CP immobilized on a CM5-chip is characterized by
K
D
= 1.07 μM. Under similar conditions, the
K
D
for apo-TF was measured and appeared to be higher than 51.3 μM. Hummel–Dreyer chromatography of CP with 51 μM apo-LF/apo-TF in the effluent demonstrated the absence of interaction between apo-TF and CP in solution, contrary to efficient interaction between apoLF and CP. In contrast to LF, the interaction of apo-TF with CP is probably not stable within the physiological range of concentrations of TF.
Epiphytic species are still the least studied group of myxomycetes, because of their life cycle, substrate specialization and method of search using “moist chambers”. The Russian’s first records of ...the Physarum lakhanpalii Nann.-Bremek.et Y. Yamam. and Ph. lenticulareNann.-Bremek. et Y. Yamam. with data on its localities, habitat, and distribution are provided. Ph. lakhanpalii is characterized by light yellow sporocarps, 0.5 mm wide and up to 10 mm long, two-layer peridium and spores, 11–12.5 µm, violaceous brown, adhering in clusters of mostly 4–6. Ph. lenticulareis characterized by gregarious sporocarps, total height 1 mm, sporotheca discoid to lenticular, black stalk, narrowed at the base, sometimes the stalks merge into 2–3 pieces, spores (9)10–11(14) µm, brown, warted and sometimes with clusters of more prominent warts. The revised description of Ph.lakhanpalii and Ph. lenticulareis given in the paper. We present micrographs in SEM for studied species, for Ph. lenticulare they presented for the first time. Ph. lenticulare is one of the rarest species of myxomycetes in the world, previously it was found only in Belgium, France, Netherlands and Japan. Most of the Physarum species in Asian part of Russia are recorded in Novosibirsk Region and currently the genus includes 29 species.
Electronic Processes in OLED Structures Mal’tsev, E. I.; Lypenko, D. A.; Tameev, A. R. ...
Russian journal of coordination chemistry,
12/2023, Letnik:
49, Številka:
Suppl 1
Journal Article
Recenzirano
Basic processes of the electroluminescence phenomenon in OLED structures are described. The conventional theoretical models for injection, transport and recombination of charge carriers and their ...relationship with the obtained experimental data are discussed. The mobility of charge carriers is a key characteristic of the electron and hole transport. Methods for measuring mobility that adequately reflect the transport of charge carriers in OLEDs are considered.
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