A significant part of the primary gold reserves in the world is contained in sulphide ores, many types of which are refractory in gold processing. The deposits of refractory sulphide ores will be the ...main potential source of gold production in the future. The refractory gold and silver in sulphide ores can be associated with micro- and nano-sized inclusions of Au and Ag minerals as well as isomorphous, adsorbed and other species of noble metals (NM) not thoroughly investigated. For gold and gold-bearing deposits of the Urals, distribution and forms of NM were studied in base metal sulphides by laser ablation-inductively coupled plasma mass spectrometry and by neutron activation analysis. Composition of arsenopyrite and As-pyrite, proper Au and Ag minerals were identified using electron probe microanalysis. The ratio of various forms of invisible gold—which includes nanoparticles and chemically bound gold—in sulphides is discussed. Observations were also performed on about 120 synthetic crystals of NM-doped sphalerite and greenockite. In VMS ores with increasing metamorphism, CAu and CAg in the major sulphides (sphalerite, chalcopyrite, pyrite) generally decrease. A portion of invisible gold also decreases —from ~65–85% to ~35–60% of the total Au. As a result of recrystallisation of ores, the invisible gold is enlarged and passes into the visible state as native gold, Au-Ag tellurides and sulphides. In the gold deposits of the Urals, the portion of invisible gold is usually <30% of the bulk Au.
Migration is a process, which is associated with realizing cultural differences in understanding the self, relationships and the world and learning new ways of existence. Promoting multiple forms of ...the positive interaction creates a sense of belonging and cohesion for immigrants. In this context, “interaction" refers to the everyday processes or networking on the grounds of which migrants maintain contact with each other and with receiving societies. Therefore, a lot of cities realise policies and projects that ensure the application of equal rights for all, fight against discrimination and racism, and support constructive interaction between individuals and groups of different backgrounds, different cultures and different generations. The purpose of this research is to consider how one of these programs, namely the Intercultural Cities Programme, takes into account the network factor in its implementation and to prove how important this factor is for integrating immigrants into the host community. The hypothesis of this work is based on the idea that the using of the network factor develops intercultural resilience building. The primary method for this study is literature review. The examination of appropriate literature gives rigorous description of current situation with immigrants and cross-cultural resilience in general and within the framework of the Intercultural Cities project. Research results reflect the idea of integrating immigrants into communities with the help of network factor. The significance of this study is conditioned by providing learning cities with information about cross-cultural resilience building and making cities all over the world rethink their policies for using diversity as a stimulus to progress.
New fluorescent systems for photocatalysis, sensors, labeling, etc., are in great demand. Amphiphilic ones are of special interest since they can form functional colloidal systems that can be used in ...aqueous solutions. A new macrocycle platform for click chemistry and its adduct with o-propargylfluoresceine was synthesized and characterized using modern physical techniques. Nanosized solid lipid nanoparticles (SLNs) from the calixarene-fluoresceine adduct were synthesized through the solvent injection technique and well-characterized in the solution and in solid state using light-scattering and microscopy methods. The maximum fluorescence intensity of the SLNs was found to be in the pH range from 7 to 10. The Förster resonance energy transfer (FRET) efficiency from SLNs to rhodamine 6g was found to be 97.8%. Finally, pure SLNs and the FRET system SLNs-Rh6G were tested in model photocatalytic ipso oxidative hydroxylation of phenylboronic acid under blue LED light. The SLNs-Rh6G system was found to be the best, giving an almost qualitative phenol yield, which was shown by HPLC-UV analysis.
New models for ACE2 receptor binding, based on QSAR and docking algorithms were developed, using XRD structural data and ChEMBL 26 database hits as training sets. The selectivity of the potential ...ACE2-binding ligands towards Neprilysin (NEP) and ACE was evaluated. The Enamine screening collection (3.2 million compounds) was virtually screened according to the above models, in order to find possible ACE2-chemical probes, useful for the study of SARS-CoV2-induced neurological disorders. An enzymology inhibition assay for ACE2 was optimized, and the combined diversified set of predicted selective ACE2-binding molecules from QSAR modeling, docking, and ultrafast docking was screened in vitro. The in vitro hits included two novel chemotypes suitable for further optimization.
The purpose of this study was to investigate the interfacial microstructure that was produced during dissimilar friction stir lap welding (FSW) of 6013 aluminum alloy and Ti-6Al-4V. FSW was conducted ...under a zero-penetration condition, i.e., the welding tool was plunged exclusively into the upper (aluminum) plate of the dissimilar lap joint. To facilitate the interpretation of microstructural processes, finite element modeling (FEM) was applied to evaluate the temperature field within the weld zone. The FEM simulation revealed a very sharp temperature gradient across the dissimilar interface. This effect was attributed to the generation of FSW heat exclusively within the aluminum part and a relatively low thermal conductivity of titanium. The abrupt temperature drop on the titanium side imposed a strict limitation on the diffusion penetration of aluminum and thus resulted in a relatively thin (~0.5 μm) and discontinuous intermetallic compound. Due to the complex chemical composition of the FSWed aluminum alloy, the diffusion processes also involved alloying elements. Consequently, the evolved intermetallic compound had a complicated chemical composition, with the principal elements being aluminum, titanium, silicon, manganese, and magnesium.
The construction industry market is going through serious crisis as well as the entire global market, and they are not local, but systemic.
Recycling of wastes from construction industry enterprises ...is currently an extremely urgent problem for most manufacturing enterprises. The solution of these problems involves solving a number of socio-economic and environmental problems, namely, increasing the efficiency and profitability of enterprises and simultaneously complying with annually strict environmental requirements.
The authors studied the possibility of using wastes of wall and partition blocks of autoclaved aerated concrete production in the technological cycle on the example of Glavbashstroy LLC. It was determined that the undercut layer of autoclaved aerated concrete formed in the main production, which requires recycling, can be used as a filler after pre-drying and crushing. There is no significant decrease in quality characteristics, but due to the little-studied nature of the products obtained under operating conditions, it is recommended to use them in non-responsible structures of buildings or partitions.
The technical and economic analysis carried out in the work shows that the implementation of the wastes recycling project in the conditions of Glavbashstroy LLC does not require significant capital expenditures, the enterprise has the possibility to implement such a solution. The risks of project implementation are within the limits of strategic and operational planning. The material consumption of manufactured products is reduced by 1.8 %. The necessary changes in the technological line will require additional labor resources; therefore, the cost of production does not increase in the long term, the profitability of the enterprise remains at a sufficient level.
New complex compounds (I) - (IV) were synthesized by the reaction of 1-(2-fluorofluorophenyl) -1,4-dihydro-5H-tetrazole-5-thione (HL1), 1-(2-methylphenyl)-1,4-dihydro-5H-tetrazole-5-thione (HL2) and ...1-(2-chlorochlorophenyl)-1,4-dihydro-5H-tetrazole-5-thione (HL3) with cadmium chloride. By X-ray diffraction analysis, molecular and crystal structures of complexes (I), (II), (III) and (IV) are determined. (CIF files CCDC № 2,003,797 (I), 1,993,454 (II), 2,151,359 (III), 2,098,997 (IV)). Hirshfeld surface analysis, frontier orbital analysis, atomic charges, electrostatic potential, nonlinear optical properties, and natural bond analysis of all three‑cadmium metal-organic complexes were discussed. A molecular docking study was used to investigate compounds' binding and interactions with DNA molecules, which predicted compound I as the best binder at the DNA minor groove and demonstrated closed distance interactions. In a long run of molecular dynamics simulations, the compound I complex was also depicted with good dynamics.
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•Characterizing all new synthesizes complexes by all possible techniques to establish their chemical formulae.•Complexes (I), (II) and (IV) were determined by X-ray diffraction analysis.•Hirshfeld surface analysis revealed the fingerprint plots and molecular surface contours.•Theoretical study via DFT approach, B3LYP method.•Molecular docking and molecular dynamics simulations of the complexes have been performed.
Hantaviruses are rodent-born agents which are pathogenic in humans causing haemorrhagic fever with renal syndrome or hantavirus pulmonary syndrome. To induce a protective immunity against a European ...hantavirus (Puumala) we constructed chimaeric hepatitis B virus (HBV) core particles carrying defined fragments of the Puumala virus nucleocapsid protein. After immunisation of bank voles, the natural host of Puumala virus, with core particles possessing an insertion of the N-terminal part of Puumala virus nucleocapsid protein, four of five animals were protected against subsequent virus challenge. The results show that the major protective region of the nucleocapsid protein is located between amino acids 1 and 45 and that chimaeric HBV core-like particles are useful carries of foreign protective epitopes.
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![New Calix[4]arene-Fluoresce...](http://api.summon.serialssolutions.com/2.0.0/image/issn/XR4PS5YY4K/1420-3049_1433-1373/small "New Calix[4]arene-Fluoresceine Conjugate by Click Approach-Synthesis and Preparation of Photocatalytically Active Solid Lipid Nanoparticles")
