Materials Literature
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A unique supramolecular solid assembly with very wide channels has been formulated with aquazinc tetra(4-carboxyphenyl)porphyrin building blocks; the open porphyrin lattice is sustained by characteristic stacking interactions and multiple hydrogen bonding, it comprises only about 39% of the crystal volume, and preserv…
P69 is an isozyme of the medium size class of human 2'-5' oligoadenylate synthetases. In this study, recombinant P69 was expressed and used for enzymological and structural investigations. Bacterially expressed P69 was inactive whereas the same protein expressed in insect cells was highly active. Whether this differen…
The aniline–zinc porphyrin interaction is an order of magnitude weaker than the corresponding pyridine–zinc porphyrin interaction, but it is still strong enough to cause self-assembly of zinc aminoporphyrins in solution. Three isomeric systems are reported, two form self-assembled dimers, but the geometry of the third…
The extracellular polyhydroxybutyrate (PHB) depolymerase gene (phaZPst) of Pseudomonas stutzeri was cloned and sequenced. phaZPst was composed of 1,728 bp encoding a protein of 576 amino acids. Analyses of the N-terminal amino acid sequence and the matrix-assisted laser desorption/ionization-time-of-flight (MALDI-TOF)…
Ferromagnetic La(Fe/sub x/Si/sub 1-x/)/sub 13/ compounds with x/spl ges/0.87 show an itinerant metamagnetic transition above the Curie temperature T/sub c/. Since a large volume change of about 1.5% is caused by the transition, the present compounds have a possibility for practical applications as giant magnetostricti…
The ab initio calculations of the ground-state properties of cubic C-BN solid solutions are presented for the first time to our knowledge. The Löwdin perturbation technique has been used in the ab initio LMTO-ASA method to calculate the total energy, the equilibrium lattice constant, the bulk modulus and its pressure…
Cu+ ions, with characteristic emission at 540 nm, have been considered to be responsible for the high activity of Cu-ZSM-5 in NO decomposition. However, two types of Cu+ ions located in different structures, i.e. in ZSM-5 and Y, exhibit the 540 nm emission, but the Cu ions in Y zeolite do not exhibit such a unique act…
Key findings are presented from a systematic study which evaluated the performance of chemical vapor deposited (CVD) nitrogenrich tantalum nitride films as a diffusion barrier in copper (Cu) based metallization schemes. For this purpose, 3800 Å thick Cu films were grown by physical vapor deposition (PVD) on 550 Å thic…
A cerium(IV) double decker porphyrin 2 bearing two pairs of 4-pyridyl groups and two pairs of 3,5-dimethoxyphenyl groups was synthesized. In the presence of chiral dicarboxylic acid guests with a two carbon spacer [e.g., (1R,2R)-cyclohexane-1,2-dicarboxylic acid and Boc-L-aspartic acid] 2 gave a CD-active species. The…
The formation, by coprecipitation, of a Mg-Al layered double hydroxide (LDH) intercalate containing nitrilotriacetate (NTA) anions has been observed. The intercalated LDH has a basal spacing close to 12 Å (gallery height 7.2 Å). The rehydration of a Mg-Al mixed oxide (formed by calcination at 500 °C of a Mg-Al carbona…
Recently conventional cryochemical processes have been complemented by cryoextraction, cryoprecipitation, cryoimpregnation and freeze casting techniques. Considerably more attention is being paid to colloidal solution processing and the application of sol-gel procedures like ion exchange treatment and hydrolysis of or…
Optical second-harmonic generation (SHG) is conditional upon the structure being non-centrosymmetric and consequently, the Langmuir-Blodgett (LB) technique is of interest because it permits control at the molecular level. However, the criteria for alignment at the air/water interface, >i.e. a hydrophilic head and a hy…
A phase-field system with memory which describes the evolution of both the temperature variation and the phase variable is considered. This thermodynamically consistent model is based on a linear heat conduction law of Coleman-Gurtin type. Moreover, the internal energy linearly depends both on the present value of and…
A piezoelectric/electrostrictive RAINBOW actuator is a monolithic bending device consisting of an electromechanically active layer and a reduced passive layer formed in a high‐temperature reduction treatment. When the piezoelectric or electrostrictive layer is driven under an electric field or when the environmental t…
Polyhydroxyalkanoate biosynthesis genes of Aeromonas caviae were expressed in Escherichia coli LS5218 (fadR atoC(Con)), and the polyhydroxyalkanoate-producing ability of the recombinants was investigated. A LS5218 strain harboring only phaCAc (polyhydroxyalkanoate synthase gene) did not accumulate any polyhydroxyalkan…
Imidodiphosphinate ligands form a hydrophobic shell around terbium and europium ions leading to long-lived, highly luminescent complexes.
We describe the preparation of a manganese oxide polymorph in which the solid‐pore architecture of the material is controllably varied. All gels derived from a sol‐gel synthesis and annealed to crystallize in the 2 × 2 tunnel structure of cryptomelane , but exhibit markedly different final pore structures based on how…
An Al-0.2%Sc alloy and an Al-3%Mg-0.2%Sc alloy were subjected to equal-channel angular pressing to a strain of ∼8 to produce grain sizes of ∼0.7 and ∼0.2 μm, respectively. Because of the presence of some areas of subgrain boundaries in the Al-3%Mg-0.2%Sc alloy, additional samples of this alloy were subjected to ECA pr…
Tricycloquinazoline (TCQ) based discotic liquid crystals have recently received increasing attention due to their interesting physical and electronic properties. Three new branched chain TCQ derivatives 6a–c were prepared and characterized. One of them, 6c, was found to be mesogenic at room temperature, having a very…
The organo-pillared octahedral–tetrahedral (O/T) layer solid Co4(SO4)(OH)6(H2NC2H4NH2)0.5·3H2O is robust to loss of water molecules within the galleries, thermally stable to 300 °C and orders as a metamagnet below 14 K.