24 research outputs found
Cluster superconductivity in the magnetoelectric Pb(Fe1/2Sb1/2)O3 ceramics
We report the observation of cluster (local) superconductivity in the
magnetoelectric Pb(Fe1/2Sb1/2)O3 ceramics prepared at a hydrostatic pressure of
6 GPa and temperatures 1200-1800 K to stabilize the perovskite phase. The
superconductivity is manifested by an abrupt drop of the magnetic
susceptibility at the critical temperature TC 7 K. Both the magnitude of this
drop and TC decrease with magnetic field increase. Similarly, the low-field
paramagnetic absorption measured by EPR spectrometer drops significantly below
TC as well. The observed effects and their critical magnetic field dependence
are interpreted as manifestation of the superconductivity and Meissner effect
in metallic Pb nanoclusters existing in the ceramics. Their volume fraction and
average size were estimated as 0.1-0.2% and 140-150 nm, respectively. The
superconductivity related effects disappear after oxidizing annealing of the
ceramics.Comment: 9 pages, 5 figure
Structure of myonyms in latin anatomic terminology
The article outlines the principles for constructing myonyms, or muscle names, in Latin anatomical terminology. Myonyms are divided into 3 main groups – ‘skeletal ’, smooth and heart muscle. The structure of the muscle name is a phrase based on the Latin word «musculus» ‘muscle’ and consistent with it and uncoordinated definitions that refer to it, on the basis of which their classification is based. The study agreed definitions, we have identified 6 major groups minimow and their derivational patterns – names of muscles according to the form; the number of tendons; the direction of fibres; in respect to the joints; according to the location in the human body; functions. Inconsistent definitions distribute muscles in relation to body parts. That is why they contain the appropriate structural components.Key words: Latin anatomical terminology, muscle names, the structure of the monyms.В статье изложены принципы построения мионимов, или наименований мышц, в латинской анатомической терминологии. Мионимы подразделяются на 3 основные группы – ‘скелетные’, ‘гладкие’ и ‘сердечная мышца’. Структура названия мышцы представляют собой словосочетание на основе латинского слова «musculus» ‘мышца’ и оносящихся к нему согласованных и несогласованных определений, на основе которых строится их классификация. В результате исследования согласованных определений нами были выявлены 6 основных групп мионимов и их словообразовательных моделей – наименования мышц по форме; по количеству сухожилий; по направлению волокон; по отношению к суставам; по расположению в теле человека; по выполняемой функции. Несогласованные определения распределяют мышцы по отношению к частям тела. Именно поэтому они содержат соответствующие структурные компоненты
INVESTIGATION OF SORPTION CHARACTERISTICS OF POLYMERIC MINERAL-FILLED COMPOSITES FOR MEDICINE
The polymer compositions on the base of acrylic derivatives and bentonite particles modified by silver ions with various share and dispersion are received and studied by radical polymerization in the water. Partially neutralized acrylic acid, acrylamide and methylene-bis-acrilamide and particles of bentonite with fraction 0 - 0,05 mass.% are chosen as initial substances. The influence of bentonite concentration on absorbing characteristics of polymer materials in the distilled water is shown. It is demonstrated that the increase of bentonite fraction up to 5 mass.% leads to the rise of degree of equilibrium swelling by 1,5 – 2 times in comparison with an unfilled polymer matrix. The acrylic nanocompositions with a mass fraction of bentonite equal to 0,01 mass.% possess the greatest kinetic characteristics. Kinetic dependences of new composite materials swelling in physiological solution from a filler dispersion part are investigated. It is shown that in high dispersion (with particle size less than 0,25 mm) a part of mineral–containing filler equal to 1 mass.% leads to significant increase in values of equilibrium swelling degree in comparison with an unfilled sample (by 1,5 times). The effect of polyelectrolyte suppression of polymer composition swelling in physiological solution is studied. It results in values reduction of equilibrium swelling degree in comparison with these values in the distilled water. Application prospects for the received compositions are shown at bandages creation for wounds treatment of various etiologies. Research results are recommended for usage in medical practice for optimization of wound process march
COLLAPSE KINETIC OF COMPOSITES BASED ON COPOLYMERS OF ACRYLIC ACID AND ACRYLAMIDE FILLED WITH BENTONITE IN AQUEOUS SOLUTIONS OF POLYVALENT METALS
Polymer polyelectrolyte hydrogel composites of acrylic acid and acrylamide copolymer filled with different amounts of bentonite (from 1 to 5 wt.%) were synthesized. Collapse kinetics of hydrogel composites was studied in solutions of different concentrations of polyvalent metal salts at a constant temperature of 25 °C. The mass of water given away from hydrogels into the solution was determined by gravimetric method. It has been found that the presence of bentonite in the polyelectrolyte hydrogel composites prevents to some extent collapse in electrolyte solutions, due to steric and electrostatic interactions between the filler particles. These interactions preclude further collapse of hydrogels. The Peleg's kinetic model, most precisely describing experimental data, was applied to calculation of kinetic constants of polymer hydrogels collapse. It is shown that the initial collapse rate and the kinetic constant of collapse and swelling depend non-monotonically on the concentration (ionic strength) in the electrolyte solution. At the identical concentration of salts in the solution the kinetic constant of hydrogel collapse is independent of the radius of ions of metals of the studied salts
Data on gut metagenomes of the patients with Helicobacter pylori infection before and after the antibiotic therapy
© 2017Antibiotic therapy can lead to the disruption of gut microbiota community with possible negative outcomes for human health. One of the diseases for which the treatment scheme commonly included antibiotic intake is Helicobacter pylori infection. The changes in taxonomic and functional composition of microbiota in patients can be assessed using “shotgun” metagenomic sequencing. Ten stool samples were collected from 4 patients with Helicobacter pylori infection before and directly after the H. pylori eradication course. Additionally, for two of the subjects, the samples were collected 1 month after the end of the treatment. The samples were subject to “shotgun” (whole-genome) metagenomic sequencing using Illumina HiSeq platform. The reads are deposited in the ENA (project ID: PRJEB18265)
Data on gut metagenomes of the patients with Helicobacter pylori infection before and after the antibiotic therapy
© 2017Antibiotic therapy can lead to the disruption of gut microbiota community with possible negative outcomes for human health. One of the diseases for which the treatment scheme commonly included antibiotic intake is Helicobacter pylori infection. The changes in taxonomic and functional composition of microbiota in patients can be assessed using “shotgun” metagenomic sequencing. Ten stool samples were collected from 4 patients with Helicobacter pylori infection before and directly after the H. pylori eradication course. Additionally, for two of the subjects, the samples were collected 1 month after the end of the treatment. The samples were subject to “shotgun” (whole-genome) metagenomic sequencing using Illumina HiSeq platform. The reads are deposited in the ENA (project ID: PRJEB18265)