Materials Literature
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A new mixed transition metal pnictide oxide, Ba 2 MnZn 2 As 2 O 2, is reported. Ba 2 MnZn 2 As 2 O 2 has been prepared in quantitative yield from heating stoichiometric amounts of BaO with the elements, which are pressed into a pellet, placed in an Al 2 O 3 boat, and sealed in a fused silica ampule, at 1000 °C. This c…
The toxicity of cisplatin encapsulated in pegylated, long-circulating liposomes (SPI-077) was compared with nonliposomal cisplatin in male and female cynomolgus monkeys (n = 2-4 per sex per group) treated with intravenous infusions of 2.5 or 25 mg/kg SPI-077, 2.5 mg/kg cisplatin, placebo liposomes, or saline once ever…
The temperature dependence of the pitch was studied investigating a lattice model for a cholesteric phase using Monte Carlo (MC) computer simulations. To enable the formation of equilibrium helical structures self-determined boundary conditions have been applied using commensurable periodic images. The chiral molecule…
The modelling of nonlinear hysteretic magnetic material in the computation of shielding problems with sinusoidal excitation at power frequency is investigated. A complex valued effective reluctivity model is chosen which allows a sinusoidal calculation in spite of the material's nonlinearity. The absolute value and th…
μ-Carbido-di(pyridinphthalocyaninato(2–)eisen(IV)) reagiert mit Tetra(n-butyl)ammoniumhalogenid (nBu4N)X) in Lösung (X = F) oder in einer Schmelze (X = Cl, Br) zu Bis(tetra(n-butyl)ammonium-μ-carbido-di(halogenophthalocyaninato(2–)ferrat(IV)). Das Fluoro-Komplexsalz kristallisiert als Trihydrat monoklin in der Raumgru…
Optically active materials that show a temperature dependent inversion of the helical twist sense in the chiral smectic C* and chiral nematic phases have been known for many years. However, it has only recently been found that inversions can occur in compounds which have single chiral centres. It was found previously…
Novel hydrophilic-hydrophobic block copolymers - poly(2-hydroxyethyl methacrylate-block-4-bis(trimethylsilyl)methylstyrene) (poly(HEMA-block-BSMS) or BH polymer) - were prepared as materials potentially useful for blood-contacting devices. Among the BH(X) series including poly(HEMA) itself, platelet adhesion and activ…
Acetobacter xylinum subsp. sucrofermentans BPR2001, a cellulose-producing bacterium, that was newly isolated from a natural source, produced large amounts of the water-soluble polysaccharide, acetan. UDP-glucose is known to be the direct precursor in the synthetic pathways of both cellulose and acetan. We attempted to…
The crystal structure of [CrIIIxFeIII2–xNiIIO(O2CCH3)6(py)3]·py 1 (x = ca. 0.7, py = pyridine), has been determined at 25 °C. Although the molecule has no crystallographically imposed symmetry, the metal atoms form an almost equilateral triangle, M· · ·M 3.274(3), 3.284(4), 3.281(3) Å, with the O atom less than 0.006…
A convenient one-step reaction for the preparation of 2,3-dihydro-1,4-dithiin, 3, involved in the synthesis of the organic donor compound bis(ethylenedithio)tetraselenafulvalene (BETS), as well as the crystal structure of this donor as determined by X-ray diffraction, are presented. A qualitative insight into the π-el…
In this review article the analysis of the main problems related to the use of NiO as material for cathodes in Molten Carbonate Fuel Cells (MCFC) is reported. Thus, the most significant evidences of the mechanism of NiO dissolution have been reported as well as its correlation with the basicity of the carbonate melt,…
The complexes [Fe([9]aneN2S)2][ClO4]2, [Fe([9]aneN2S)2][ClO4]3 and [Fe([9]aneNS2)2][ClO4]2 ([9]aneN2S = 1-thia-4,7-diazacyclononane and [9]aneNS2 = 1,4-dithia-7-azacyclononane) have been prepared and the latter two characterised by X-ray crystallography. The Mössbauer spectra (isomer shift/mm s–1, quadrupole splitting…
Preparation of cells and tissues for bioartificial vascular grafts is discussed from the viewpoint of tissue engineering. In general, a neointima is not formed on vascular prostheses except at the anastomotic sites. Graft surfaces do not heal and are covered with fresh thrombi for a long period of time after implantat…
The microdroplet technique is usually designed as a fibre embedded in a drop of resin and subsequently pulled out while the drop is being supported by two knife edges, resulting in either debonding of the droplets from the fibres, or breakage of the fibres before debonding can occur. In this study, the microdroplet te…
Manganese substituted polyoxometalates (POMs), such as Li12[MnII2ZnW(ZnW9O34)2] were effective catalysts for the oxidation of alkanes to ketones with ozone in an aqueous reaction medium; a green intermediate compound observable by UV–VIS and ESR at –78 °C was postulated to be a reactive manganese ozonide species.
Oxidation of [CoIIW12O40]6– by HSO5– in both strong and weak acid solution (the latter in the presence of added [WO4]2–) gives [CoIIIW12O40]5–. The kinetics of oxidation was examined at 15–35 °C over the range [H+] = 0.05–0.625 mol dm–3 and found to exhibit pseudo-zero-order kinetics, –d[CoIIW12O406–]/dt = 2kOX[HSO5–]…
In Part I (1), the concept of “Type I” antiseizure behavior for chlorinated hydrocarbons in extreme-pressure (EP) lubrication of ferrous metals was introduced; interfacial temperature measurements and surface analyses revealed that a solid lubricating layer consisting of ferrous chloride (FeCl2) and carbon prevents se…
A hybrid between the Prussian Blue and Creutz–Taube mixed valent species is presented in the form of the bmtz-bridged bis[tetracyanoiron(+2.5)] complex 13– [bmtz = 3,6-bis(2-pyrimidyl)-1,2,4,5-tetrazine] which exhibits a very large comproportionation constant of 1014 and a delocalised structure, according to UV–VIS–NI…
Using stepwise cyclization reactions followed by an intramolecular coupling, the criss-cross overlapped tetrathiafulvalenophane 8 was readily prepared. The structure of the cis,cis isomer was elucidated by X-ray crystallography which revealed a host–guest complex with chloroform. This electron donor was used for the s…
A synthesis has been developed for both calamitic and discotic mesogens based on the bis(phenylenedithio-TTF) (BPhDT-TTF) nucleus.