Search results for "Smut"
showing 10 items of 493 documents
The structural versatility of proton sponge bismuth halides
2022
Hybrid halometalates containing lead, tin, bismuth and antimony and organic cations have recently shown a bevy of interesting photophysical properties. Aiming at finding chemically stable and thermally inert species, three halobismutate species of this class, crystallized with proton sponge-derived cations (PRSH), have been isolated as microcrystalline powders by mixing 1,8-bis(dimethylamino)-naphthalene (proton sponge, or PRS) and bismuth oxide in concentrated HX acids (X = Cl, Br and I). The two isomorphous (PRSH)3Bi2X9 (X = Br, I) species, containing isolated [Bi2X9]3- anions, are triclinic at room temperature and convert upon heating into a monoclinic structure through a displacive …
Electrocaloric Effect in (1−x)(0.8Na0.5Bi0.5TiO3-0.2BaTiO3)−xCaTiO3 Solid Solutions at High Electric Fields
2022
This research was funded by the Latvian Science Council Fund, grant number lzp-2020/2-0080. The Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme, grant number 739508.
Arsenic, antimony and bismuth complexation by L-cysteine in water
1984
Synthese, dans l'eau, des complexes L-cysteine: AsL 3 , SbL 3 •H 2 O et BiL 3 .H 2 O L=forme monoanionique de cysteine. Etude IR des structures
Bismuth trihalide complexes with nitrogen and phosphorus chelating ligands
1985
Abstract Bismuth(III) halides react with 1,10-phenanthroline, 2-pyridinecarboxaldehyde-2-pyridylhydrazone and diphenylphosphynoethane in methanol. A stoichiometry differing from 1:1 is found only for BiCl 3 (Phen) 1.33 and BiCl 3 (Dpe) 1.5 . Characterization of these compounds, which are not very soluble in common solvents, follows from analytical, mass and IR spectral data. In the low frequency region, the IR spectra proved to be useful to ascertain the presence of bridging halogens.
Synthesis and characterization of some arsenic, antimony and bismuth complexes of 2-mercaptoaniline
1983
Abstract The complexes of arsenic, antimony and bismuth as well as phenylantimony and phenylbismuth with monoanionic 2-mercaptoaniline are reported. IR spectra are consistent with chelating behaviour of the ligand but only a weak nitrogen to metal bonding interaction is advanced. The mass spectra fragmentation pattern is also presented. It can be interpreted with the loss of successive ligand units and, as a general feature, the abundance of a given ion decreases as the mass of the metal increases. Species with one or two protons less give more intense peaks possibly corresponding to ions containing the dianionic form of the ligand.
A Combination of Celecoxib and Glucosamine Sulfate Has Anti-Inflammatory and Chondroprotective Effects: Results from an In Vitro Study on Human Osteo…
2021
This study investigated the possible anti-inflammatory and chondroprotective effects of a combination of celecoxib and prescription-grade glucosamine sulfate (GS) in human osteoarthritic (OA) chondrocytes and their possible mechanism of action. Chondrocytes were treated with celecoxib (1.85 µM) and GS (9 µM), alone or in combination with IL-1β (10 ng/mL) and a specific nuclear factor (NF)-κB inhibitor (BAY-11-7082, 1 µM). Gene expression and release of some pro-inflammatory mediators, metalloproteinases (MMPs), and type II collagen (Col2a1) were evaluated by qRT-PCR and ELISA
Nanostrukturētu bismuta selenīda pārklājumu sintēze un īpašību izpēte pielietojumiem termoelektriskās ierīcēs
2017
Dažādi bismuta ķīmiskie savienojumi, piemēram, Bi2Se3 un Bi2Te3, ir perspektīvi termoelektriskie materiāli ar nesen novērotām topoloģisko dielektriķu īpašībām, kuru šaurā aizliegtā zona, optimālā lādiņnesēju koncentrācija, ļauj veidot termoelektriskos pārklājumus ar augstu efektivitāti. Darba gaitā sintezēti bismuta selenīda pārklājumi ar dažādām virsmas nanostruktūrām un biezumiem ar mērķi palielināt bismuta selenīda termoelektrisko efektivitāti. Paraugu morfoloģiskā izpēte veikta pielietojot skenējošo elektronu un atomspēku mikroskopiju. Zēbeka koeficienta un elektriskās vadītspējas mērījumi veikti, lai noteiktu paraugu jaudas faktoru, kas nosaka termoelektriskā materiāla efektivitāti atk…
Differential uptake and killing potential of Campylobacter jejuni by human peripheral monocytes/macrophages
1997
The ability of Campylobacter jejuni to survive in monocytes after phagocytic uptake was tested in a new in vitro model using adherent macrophages derived from human peripheral monocytes. The cells were stimulated with cytokines before use to ensure full phagocytic and killing activity. The kinetics of uptake and killing of bacteria was followed for 72 h with 16 strains, including stool and blood isolates and laboratory adapted strains. Significant bacterial strain differences were not observed, but the viability of phagocytosed bacteria was dependent on the individual donating the macrophages. The majority of blood donors carried macrophages that killed phagocytosed Campylobacter within 24 …
Modulation of longevity-associated genes by estrogens or phytoestrogens.
2008
Abstract Females live longer than males. We have shown that the higher levels of estrogens in females protect them against aging, by up-regulating the expression of antioxidant, longevity-related genes, such as that of selenium-dependent glutathione peroxidase (GPx) and Mn-superoxide dismutase (Mn-SOD). Both estradiol and genistein (the most abundant phytoestrogen in soybeans) share chemical properties which confer antioxidant features to these compounds. However, the low concentration of estrogens and phytoestrogens make it unlikely that they exhibit significant antioxidant capacity in the organism. Physiological concentrations of estrogens and nutritionally relevant concentrations of geni…
Exercise and hormesis: activation of cellular antioxidant signaling pathway.
2006
Contraction-induced production of reactive oxygen species (ROS) has been shown to cause oxidative stress to skeletal muscle. As an adaptive response, muscle antioxidant defense systems are upregulated after heavy exercise. Nuclear factor (NF) kappaB and mitogen-activated protein kinases (MAPKs) are the major oxidative stress-sensitive signal transduction pathways in mammalian tissues. Activation of NF-kappaB signaling cascade has been shown to enhance the gene expression of important enzymes, such as mitochondrial superoxide dismutase (MnSOD) and inducible nitric oxide synthase (iNOS). MAPK activations are involved in a variety of cellular functions including growth, proliferation, and adap…