The crystal structure of a new mixed-valence terbium fluoride Rb2AlTb3F16 has been determined from single-crystal X-ray diffraction data and refined to a conventional R=0.027 (Rω=0.031) from 298 independent reflections (29 parameters). This compound crystallizes in the hexagonal system, space g...
BackgroundSilver diamine fluoride (SDF) is used topically to prevent or arrest caries. The authors' aim was to characterize the kinetics of silver and fluoride after topical application of SDF.
A novel facile method of non-doped and fluorescent terbium-doped cerium fluoride stable aqueous sols synthesis is proposed. Intense green luminescence of CeF3:Tb nanoparticles can be used to visualize these nanoparticles' accumulation in cells using confocal laser scanning microscopy. Ceriu...
The magnetic structure of the mixed-valence terbium (III/IV) fluoride KTb3F12 has been determined by means of neutron powder diffraction. This compound which crystallizes with the I4/m tetragonal space group (no. 87) and close lattice parameters, a=7.715(1) Å and c=7.530(1) Å (values from single...
Terbium-containing oxide fluoride glasses were prepared in TbF3–BaF2–AlF3–GeO2 and Tb4O7–BaF2–AlF3–GeO2 systems. Auger electron spectra (AES spectra) of these glasses have been measured to characterize those glasses. Quantitative analysis of cation content in the glass was performed with r...
The thermal decomposition of terbium tetrafluoride was already used for the synthesis of mixed-valence terbium fluorides such as KTb3F12 or K2Tb4F17. In this paper, new mixed-valence terbium (III/IV) fluorides with formula Rb2AlTb3F16 and RbAl2Tb4F22 with a statistical distribution between Tb(II...
X-ray absorption fine structure (XAFS) measurements on terbium fluoride in molten lithium fluoride and in molten lithium–calcium fluoride mixtures, (e.g. 0.20TbF3–0.80LiF, 0.20TbF3–0.62LiF–0.18CaF2, 0.20TbF3–0.48LiF–0.32CaF2, 0.50TbF3–0.50LiF, and 0.50TbF3–0.38LiF–0.12CaF2), have been c...
To study the potential coordination versatility of 5-methylquinoxaline, the preparation of complexes which contain it as a mono-, bi- or tridentate ligand was carried out. On reaction with [Pd(OAc)2]3 it coordinates to the metal through its less sterically blocked nitrogen atom (N(1), distal to ...
The β-receptor antagonists alprenolol, bunolol and propranolol were evaluated for their effects on pulmonary resistance in anaesthetized dogs in the absence and presence of bronchoconstrictor agents. The effectiveness of the β-receptor antagonists in (a) blocking isoprenaline-induced bronchodi...
The reaction between 2,4-dichlorobenzeneboronic acid, 3,5-bis(trifluoromethyl)benzeneboronic acid or the 1,3-propanediamine derivatives of the boronic acids and the 3-isopropylaminopropan-2-ol side chain of the β-blocking drugs occurs essentially as an on-column thermal reaction in the gas phas...
Clenbuterol (Broncodil and trade) is a direct-acting sympathomimetic agent with mainly beta-adrenergic activity and a selective action on β2 receptors (a β2 agonist). It has properties similar to those of salbutamol. It is used as a bronchodilator in the management of reversible airways obstru...
A series of (1H-benzo[d][1,2,3]triazol-1-yl)(4-benzylpiperazin-1-yl)methanones and of (1H-benzo[d][1,2,3]triazol-1-yl)(4-phenylpiperazin-1-yl)methanones has been prepared and tested on human fatty acid amide hydrolase (FAAH) and monoacylglycerol lipase (MAGL). In the benzylpiperazinyl series, co...
In our study 1-(3,4-methylenedioxyphenyl)-2-propanone (MDP-2-P or PMK) was prepared by two different routes, i.e. by oxidizing isosafrole in an acid medium and by 1-(3,4-methylenedioxyphenyl)-2-nitropropene reduction. The final product-MDP-2-P was subjected to GC/MS analysis. The intermediates a...
Pepper fruit is one of the highest vitamin C sources of plant origin for our diet. In plants, ascorbic acid is mainly synthesized through the L-galactose pathway, being the L-galactono-1,4-lactone dehydrogenase (GalLDH) the last step. Using pepper fruits, the full GalLDH gene was cloned and the ...
A computer-generated molecular superposition of the key pharmacophores in 3-O-tetradecanoyl-2-deoxy-L-ribonolactone (1) and phorbol-12-myristate-13-acetate (PMA) indicated that the corresponding one carbon homologue, 2,5-dideoxy-3-O-tetradecanoyl-D-galactono-1,4-lactone (2) would have an improve...
The standard (p∘ = 0.1 MPa) molar energies of combustion in oxygen, at T = 298.15 K, for crystalline d-,l-galactono-1,4-lactone, d-,l-gulono-1,4-lactone and l-mannono-1,4-lactone were measured by static-bomb calorimetry, by using paraffin oil as auxiliary substance and leading to the following ...
The flavoenzyme l-galactono-γ-lactone dehydrogenase (GALDH) catalyzes the terminal step of vitamin C biosynthesis in plants. Little is known about the catalytic mechanism of GALDH and related aldonolactone oxidoreductases. Here we identified an essential Glu–Arg pair in the active site of GALD...
The L-ascorbic acid (AA) content of pollen from three cultivars of Lilium longiflorum Thunb. was 260–280 μg/g fresh wt. of pollen. During germination ascorbic acid content gradually decreased reaching 70% of the original value at 6 h. Pollen germinated in media containing 0.29 M D-glucose (an ...
Acetal derivatives of L-galactono-1,4-lactone showing thermotropic liquid crystalline properties were synthesized without sovent in the presence of dry montmorillonite KSF using microwave irradiation.
An efficient and short synthesis of vitamin C has been accomplished from L-galactono-1,4-lactone via methyl 3,5:4,6-di-O-ethylidine-L-galactonate.
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