Materials Literature
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This paper describes the synthesis, electrochemistry, and electronic properties of 5,5′-di(2-thienyl)-2,2′-bithiazole, 5,5′-di(2-thienyl)-4,4′-dimethyl-2,2′-bithiazole, and 5,5′-bis(3-methoxy-2-thienyl)-4,4′-dimethyl-2,2′-bithiazole, their complexes with Ru(bpy)22+ and Os(bpy)22+, and electrochemically prepared polyme…
This paper deals with the bonding of sulfur-vulcanized rubber compounds to metals. It had previously been reported that bis-(triethoxysilyl)ethane and vinyltriethoxysilane were found to work for bonding peroxide-cured rubber compounds to metals. These silanes were found not to work with sulfur-cured rubber compounds.…
The nonallosteric and allosteric L-lactate dehydrogenases of Lactobacillus pentosus and L. casei, respectively, exhibited broad substrate specificities, giving virtually the same maximal reaction velocity and substrate K(m) values for pyruvate and oxaloacetate. Replacement of Pro101 with Asn reduced the activity of th…
The combination of bpa with the pseudohalide cyanate (NCO−) leads to the preparation of two new isomorphous compounds exhibiting the formula [M(NCO)2(bpa)2]n·bpa where M = Co (1), Mn (2). Both of them have been magnetostructurally characterised by means of X-ray diffraction analysis, TG measurements, IR and ESR spectr…
The goal of this work was to test for the occurrence of the (IR) voltage form of crevice corrosion in a corrosion-resistant alloy. Crevice corrosion occurred immediately (prior to a change in the solution composition) in alloy T-2205 duplex stainless steel exposed to an acidic-chloride media. This was indicated by the…
Hydrogen absorbed from the test environment was detected experimentally from an Al–4.9%Zn–2.2%Mg–1.3%Cu alloy deformed in laboratory air, which is a direct evidence of hydrogen embrittlement. The alloy exhibited grain boundary embrittlement when deformed at a strain rate of 10−7 s−1 in laboratory air and hydrogen beha…
The crystals of ferroelectric-semiconductor Sn2P2S6 exhibit a strong piezoelectric effect. We present measurements of ultrasonic and piezoelectric properties of other crystals of the Sn2P2S6 family: i.e., Sn2P2Se6 and CuInP2S6. The acoustoelectric method was applied to measure electromechanical coupling parameters in…
Poly(2,3,5,6-tetrafluoro-1,4-phenylenevinylene) (PTFPV) was prepared for the first time by the Stille cross-coupling reaction and the resulting material was characterized through MALDI-TOF mass spectrometry, employing a novel sample preparation protocol suitable for insoluble compounds; preliminary optical and electro…
Systematic studies of nickel tungstate thin film, amorphous and polycrystalline powders were performed by X-ray absorption spectroscopy at the Ni K and W L1,3 edges, X-ray diffraction and Raman spectroscopy. We found that in spite of the similarity of the local environment around nickel and tungsten ions in all three…
Previously, we showed that liposomes with surface-attached anti-CD19 were internalized into human B lymphoma cells through receptor-mediated endocytosis, resulting in improved anti-tumor efficacy 1-2 . In order to further increase the efficacy of antineoplastic drug-containing liposomes, we have taken advantage of thi…
The morphological evolution of isolated individual single crystals deposited on solid substrates was investigated during annealing experiments using in situ and ex situ atomic force microscopy techniques. The crystal morphology changed during annealing at temperatures slightly above the original crystallization temper…
Several layered double hydroxides (LDHs) containing metals of different nature intercalated with benzoate anions have been synthesised in order to study the O-alkylation reaction of the interlayered species with alkyl halide in dry media conditions. In all the cases, the expected ester was obtained with good yield (>6…
The synthesis and liquid crystalline behaviour of several sixteen-branched dendrimers based on poly(amidoamine) (PAMAM) and poly(propyleneimine) (DAB) are reported. Mono-, di- and trialkoxybenzoyloxysalicylaldehydes are used as mesogenic promotor moieties and are attached at the peripheral amino groups of the pre-exis…
A DNA–polyaniline complex has been successfully prepared by the photopolymerization of dimeric aniline via photocatalytic reaction with Ru(bpy)32+ complex in the presence of DNA , a reaction which occurs, even in solution at pH 3.0–6.0, due to the specific local “lower-pH” environment provided by DNA.
Two new steroid derivatives, (22E,24R)-3alpha-ureido-ergosta-4,6,8(14),22-tetraene (1) and (22E,24R)-5alpha,8alpha-epidioxyergosta-6,9,22-triene-3beta-ol 3-O-beta-D-glucopyranoside (2) were isolated from the fruit bodies of Chlorophyllum molybdites (Agaricaceae). The structures were established by spectroscopic and ch…
The complexation of the new mixed thia–aza–oxa macrocycle 5-oxa-2,8-dithia[9](2,9)-1,10-phenanthrolinophane (L) containing the 1,10-phenanthroline unit with NiII, PdII, PtII, RhIII and RuII has been investigated. The results have been compared with those obtained with the structurally related ligand 2,5,8-trithia[9](2…
Alkane (petroleum ether) vapor plasma technique was used for surface modification of chitosan membranes to control their permeation rate of water-soluble drugs and metabolites. Water contact angles of the chitosan surface increase from 13° to 23° after plasma treatment at 93 W for 60 min, and from 13° to 26° after pla…
The complex dielectric constant of 4- n -pentyl-4 ′ -cyanobiphenyl (5CB) was measured between 0.0001 Hz and 1 kHz in nematic and isotropic phases. Dielectric relaxation due to space-charge polarization was observed for both phases. In the nematic phase, the diffusion coefficient D ⊥ and the mobility µ ⊥ of ions in 5CB…
The surface morphology of polypyrrole (ppy) films prepared by potentiostatic and voltammetric methods at the platinum electrode was studied by ex situ atomic force microscopy (AFM). The study was mainly focused on the early stages of polymer film growth up to a film thickness of 30 to 50 nm. AFM analysis revealed that…
The aim of the present study was to develop polyamide 6 membrane blended with gelatin and chondroitin sulfate using the phase precipitation method and evaluate its in vitro biocompatibility. Morphology of membranes was studied by laser scanning confocal microscopy which allowed the nondestructive visualization of inte…