Based on the identification of 60 samples collected by one of the authors, an annotated list of liverworts of the Alania National Park (North Caucasus, Republic of North Ossetia) was compiled for the first time. The list includes 27 species, the vast majority of which ( 19) were not previously known to the republic. The annotation for each species includes some synonyms, the presence of reproductive structures, habitat characteristics, a list of localities and associated species. The morphological features and distribution of rare in the Caucasus and little-known species are discussed. Based on publications and data obtained here, the list of species currently known for the Republic of North Ossetia including 52 species is provided. The oil bodies of Solenostoma caucasicum are described for the first time. GenBank accession numbers for seven species (nine samples) are given, a total of 17 accessions were deposited into GenBank. РезюмеНа основе идентификации 60 образцов, собранных одним из авторов, впервые составлен аннотированный список печеночников национального парка "Алания" (Северный Кавказ, Республика Северная Осетия). Список насчитывает 27 видов, подавляющее большинство из которых (19) ранее не были известны в республике. Краткие описания каждого вида включают в себя некоторые синонимы, наличие репродуктивных структур, характеристику местообитаний, перечисление местонахождений и сопутствующих видов. Обсуждаются морфологические особенности и распространение редких на Кавказе и малоизвестных видов. На основе публикаций и полученных данных составлен список видов, известных в настоящее время для республики Северная Осетия, насчитывающий 52 вида. Впервые дается описание масляных телец Solenostoma caucasicum. Приводятся номера Генбанка для семи видов (девяти образцов, 17 последовательностей), депонированных в Генбанк.
Both surface and bulk nonuniformities in A1,Gq -,As solid solution compositions were determined by surface radiography of epitaxial A1,Gal -,As-GaAs heterojunctions with diffused radioactive Zne5 atoms. properties of epitaxial films depend to a considerable extent on uniformity of their composition, impurity distribution, structural defects etc. The distribution of solid solution components and impurities is usually studied by X-ray electron probe analysis ( DZHAFAROV et al. 1967DZHAFAROV et al. , 1969 as well as by the methods based on electrical and radioactive measurements on individual layers (BOLTAKS) It is often desirable to obtain the distribution pattern of composition uniformity over the surface. Using for this purpose the method of contact radiography (DRITZ et al.), we succeeded in determining the nonuniformity in the composition of A1,Gal -,As solid solutions. It should be noted that the use of autoradiography in its conventional form is not always possible because of difficulties encountered in finding convenient isotopes in the systems of interest (in particular, in the A1,Gal -,As solid solutions). These difficulties can be avoided by diffusing into the surface of the sample radioactive tracer atoms the distribution of which would be sensitive to nonuniformities in composition. Radiography involving tracer atoms permits to obtain the pattern of distribution of solid solution components both on the surface and in the bulk of the crystal.The method used is essentially as follows. First, brief diffusion is effected into the sample under study of a radioactive impurity with sufficient high solubility. Next, the sample is subjected t o contact radiography with subsequent photometry. Since the surface concentration of impurity depends on solid solution composition (ARSENI et al.), a change in composition over the surface should produce a corresponding change in concentration of the radioactive isotope of impurity, and hence, a change in the density of blackening over the surface.The above method of locating nonunformities in solid solution compositions was tested on A1,Gal -,As-GaAs-heterostructures.The heterojunctions were
The article reviews the domestic and international practice of using municipal wastewater as an unconventional chemical meliorant with a fertilizing effect on irrigation fields, in hydroponic systems, as well as overburden dumps and ore enrichment waste during reclamation activities. The object of research was ore enrichment waste ("tailings") of the apatite-nepheline factory ANOF-2 of the Apatite CF JSC with a predominance of nepheline sands in their composition. The tailing dump is included in the list of objects of accumulated environmental damage in the region, but due to its rich mineral composition, it is recognized as a man-made Deposit that is subject to conservation in order to obtain Apatite, nepheline, sphene, aegirine and titanomagnetite concentrates in the future. The purpose of this work was to evaluate the effectiveness and prolonged effect of chemical reclamation of nepheline sands by clarified municipal wastewater (CMWW) to increase the biogenicity (NPK status) of technical soil when creating vegetation cover as a method of preserving the tailings dump. The article uses the method of phytotesting of soil irrigated by the CMWW of a regional enterprise of the agricultural sector on a single-species seed material recommended for recultivation of disturbed territories in the Northern regions. During the formation of seeded phytocenosis from meadow Timothy (Phleum pratense L.) on nepheline sands the stimulating effect of CMWW on the soil nutrient regime was confirmed. After phytoextraction (at the end of the experiment), it retains a high residual level of the main nutrient elements (N, P, K), which indicates a prolonged effect of CMWW. To confirm the effect obtained in the laboratory, a field experiment was launched at the ANOF-2 reserve tailings storage facility in 2019, and observations are continuing. Irrigation of nepheline sands with clarified municipal wastewater at a total rate of 380 t/ha, subject to the conditions of multiple uniform distribution of irrigation water over the area, has a prolonged effect on the nutrient regime of the soil and is sufficient to create a stable vegetation cover from Timothy meadow on ore enrichment waste without land use.
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