The reasons of low efficiency of oil extraction from reservoirs of the Vereyskian horizon at Akanskoye oilfield

The authors researched oil reservoirs of Vereyskian horizon at Akanskoye oilfield. Oilfield is located on the east of the Melekess depression (the Tatarstan Republic). Two types of reservoir were identified: clastic and carbonate. Clastic type is presented by sandstones, and carbonate is presented by bioclastic, fine grained limestone. Geophysical data show that reservoirs are low productive, but in core samples they are characterized by regular, uniform oil saturation. By methods of optic-microscopic researches and nuclear magnetic resonance it was established that sandstones and limestones have a good petrophysical properties. Studying of composition of the water oil fluids, which are filling pore space of reservoirs are showed the high share of water and motionless hydrocarbons. In general, we consider low productive of Vereyskian reservoirs is result of oil oxidation processes, including content of authigenous dolomite and calcite as indicator of water-flooding processes. Obviously that extent of water-flooding in multilayer reservoirs is various. This cause low productivity some reservoirs

Laser performance investigation of a new UV active media LiY 0,3Lu0,7F4:Ce3+ and LiY 0,3Lu0,7F4:Ce3++Yb3+

We show that the LiY0,3Lu0,7F4:Ce 3+ and LiY0,3Lu0,7F4:Ce 3++Yb3+ crystals are promising active media of UV spectral range with low-threshold lasing (30-90 mJ/cm2). Due to crystal-chemical approach (additional doping by ions Yb3+) we obtained the effect of suppression of spurious photodynamic processes. The active medium LiY0,3Lu0,7F4: Ce3++ Yb3+ combines properties of saturable amplifier and oscillator with small saturation energy, and promising to generate pulses of ultrashort duration in the UV spectrum. © Published under licence by IOP Publishing Ltd

Group - Theoretical representation of holohedral forms of crystals by conjugated simple forms. Intergrowth of crystals

The schemes for division of holohedral simple forms of crystals into conjugated simple forms are derived by decomposition of the symmetry group of the primitive sublattice into double cosets. The number of equivalently oriented simple forms in the intergrowth of crystals, whose primitive space sublattices are parallel to one another, is equal to the number of holohedral permutational conjugated simple forms, which has the value 992 for all the 32 symmetry classes. © 2000 MAIK "Nauka/Interperiodica"

Spectral-kinetic and photochemical properties of Ce3+:Na 4Y6-xYbxF22 single crystals

The spectral-kinetic characteristics of Ce3+ ions doped Na 4Y6-xYbxF22 (x=0-0.05) single crystals were studied. Ce3+ ions 5d-4f interconfigurational fluorescence quantum yield versus Yb3+ ion codopant concentration was measured. Pump-induced color center absorption spectra were studied and the efficiency of Yb3+ ions codoping antisolarant crystal-chemical technique applied to Na4Y6F22:Ce3+ was demonstrated. The optimal Yb3+ ions content from the point of view of effective tunable laser action was estimated. The obtained results allow proposing Na4Y6-xYbxF22 as a new prospective photochemically stabilized material for UV/VUV application

Photo- and X-ray induced cytotoxicity of CeF3-YF3-TbF3 Nanoparticle-Polyvinylpyrrolidone -"Radachlorin" composites for combined photodynamic therapy

The Ce0.5Y0.35Tb0.15F3 nanoparticles with a CeF3 hexagonal structure were synthesized using the co-precipitation technique. Сonjugated with Radachlorin using polyvinylpyrrolidone coating as well as without Radachlorin were detecte

Magnon bose-einstein condensation in CsMnF 3 and MnCO 3

The Spin Supercurrent and Bose-Einstein condensation of magnons, similar to an atomic BEC, was observed in 1984 in superfluid 3He-B. The same phenomena should exist in solid magnetic systems. We describe here the first observation of magnon BEC in solid easy plain antiferromagnets CsMnF 3 and MnCO 3. We have observed magnon BEC on a mode of coupled Nuclear-Electron precession. The dynamical properties of this mode have many similarities with NMR of superfluid 3He-A. The frequency changes with deflection of nuclear magnetization. Furthermore, the involvement of electron ordered subsystem gives the magnon-magnon interaction, spin waves and spin supercurrent, while the nuclear subsystem gives the relatively long time of relaxation

Toxicity of laser irradiated photoactive fluoride PrF3 nanoparticles toward bacteria

© Published under licence by IOP Publishing Ltd. The article is devoted to exploration of biological effects of crystalline PrF3 nanoparticles toward Salmonella typhimurium TA 98 bacteria under the laser irradiation. Obtained results show bactericidal activity of PrF3 nanoparticles and optimal parameters of laser irradiation (power of laser irradiation, wavelength, diameter of the laser spoil, and exposure time) have been found under which the effects of bactericidal activity become the most significant. Survival of bacterial cells under laser irradiation with wavelength 532 nm in colloidal solution of PrF3 nanoparticles was 39%, 34%, 20% for exposure times 5 minutes, 15 minutes and 30 minutes, correspondingly

Photoinduced toxicity of PrF<inf>3</inf> and LaF<inf>3</inf> nanoparticles

© 2016, Pleiades Publishing, Ltd.PrF3 and LaF3 nanoparticles were synthesized by the hydrothermal method. The size distribution of these nanoparticles in the colloidal solution produced was studied by photon correlation spectroscopy. The mean diameter of the nanoparticles was 42 ± 1 nm. During the study of the toxicity of the nanoparticles, the mixture of a colloidal solution of the nanoparticles with cells to be studied was irradiated by 30-mW continuous lasers at wavelengths of 532 and 473 nm. The concentration of salmonella cells in normal saline was 106 cell/mL, while that of nanoparticles was 0.1 g/L. The cell survival percentage was 39, 34, and 20% for the irradiation times of 5, 10, and 15 min, respectively, at an optimal laser radiation power density of 0.4 W/cm at a wavelength of 532 nm. It was ascertained that LaF3 nanoparticles do not possess the property of photoinduced toxicity and the apoptosing effect. Moreover, the property of photoinduced toxicity is not shared by microparticles, in contrast to nanoparticles

Tiny Rare-Earth Fluoride Nanoparticles Activate Tumour Cell Growth via Electrical Polar Interactions

© 2018, The Author(s). Localised extracellular interactions between nanoparticles and transmembrane signal receptors may well activate cancer cell growth. Herein, tiny LaF3 and PrF3 nanoparticles in DMEM+FBS suspensions stimulated tumour cell growth in three different human cell lines (A549, SW837 and MCF7). Size distribution of nanoparticles, activation of AKT and ERK signalling pathways and viability tests pointed to mechanical stimulation of ligand adhesion binding sites of integrins and EGFR via a synergistic action of an ensemble of tiny size nanoparticles (< 10 nm). While tiny size nanoparticles may be well associated with the activation of EGFR, integrin interplay with nanoparticles remains a multifaceted issue. A theoretical motif shows that, within the requisite pN force scale, each ligand adhesion binding site can be activated by a tiny size dielectric nanoparticle via electrical dipole interaction. The size of the active nanoparticle stayed specified by the amount of the surface charges on the ligand adhesion binding site and the nanoparticle, and also by the separating distance between them. The polar component of the electrical dipole force remained inversely proportional to the second power of nanoparticle’s size, evincing that only tiny size dielectric nanoparticles might stimulate cancer cell growth via electrical dipole interactions. The work contributes towards recognising different cytoskeletal stressing modes of cancer cells

Gut-associated plasmacytoid dendritic cells display an immature phenotype and upregulated granzyme B in subjects with HIV/AIDS

© 2015 Boichuk, Khaiboullina, Ramazanov, Khasanova, Ivanovskaya, Nizamutdinov, Sharafutdinov, Martynova, DeMeirleir, Hulstaert, Anokhin, Rizvanov and Lombardi. Plasmacytoid dendritic cells (pDCs) in the periphery of subjects with human immunodeficiency virus (HIV)/acquired immunodeficiency syndrome (AIDS) decrease over time, and the fate of these cells has been the subject of ongoing investigation. Previous studies using animal models as well as studies with humans suggest that these cells may redistribute to the gut. Other studies using animal models propose that the periphery pDCs are depleted and gut is repopulated with naive pDCs from the bone marrow. In the present study, we utilized immunohistochemistry to survey duodenum biopsies of subjects with HIV/AIDS and controls. We observed that subjects with HIV/AIDS had increased infiltration of Ki-67+/CD303+ pDCs, a phenotype consistent with bone marrow-derived pre-pDCs. In contrast, Ki-67+/CD303+ pDCs were not observed in control biopsies. We additionally observed that gut-associated pDCs in HIV/AIDS cases upregulate the proapoptotic enzyme granzyme B; however, no granzyme B was observed in the pDCs of control biopsies. Our data are consistent with reports in animal models that suggest periphery pDCs are depleted by exhaustion and that naive pDCs egress from the bone marrow and ultimately infiltrate the gut mucosa. Additionally, our observation of granzyme B upregulation in naive pDCs may identify a contributing factor to the gut pathology associated with HIV infection