Materials Literature
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The possible use of ozone to produce higher oxides was analyzed thermodynamically. Because the activity of oxygen in ozone is ∼10 18 at room temperature and ∼10 8 at 773 K, ozone may react with metals to yield higher‐oxidation‐state products than does an ambient pressure of pure oxygen. In agreement with this thermody…
The effect of a patterned surface on the phase separation kinetics of a thin polymer film has been investigated using the Cahn–Hilliard–Cook model in three dimensions with the addition of a short range surface potential. We have observed pattern-induced spinodal waves perpendicular to the surface creating “checkerboar…
The ionic conductivity and relaxation in the lithium tellurite glasses with varying ${\mathrm{Li}}_{2}\mathrm{O}$ content have been investigated in the frequency range 10 Hz to 2 MHz and in the temperature range from 373 K to just below the glass transition temperature. The composition dependences of the dc conductivi…
W e analyse the influence of charged impurities and flexoelectric polarization on the optical transmission of a hybrid aligned nematic liquid crystal cell. The theoretical results obtained within the framework of the Poisson-Boltzmann equation and Frank elastic theory are compared with the observed optical response [N…
Phase properties of gradient AB copolymer melts which consist of chains with the specified chemical distribution of A and B monomers have been studied within the Landau–Ginzburg model. All the melts with the linear distribution of the monomers exhibit only a direct continuous phase transition from disordered to the la…
A method of radiation dosimetry is described using pulsed optically stimulated luminescence (POSL). An irradiated sample is stimulated with a series of light pulses from a laser tuned to an appropriate wavelength. The emitted light, due to the detrapping of charges and their subsequent recombination with charges of th…
When phosphorylated, the dimeric form of nitrogen regulatory protein C (NtrC) of Salmonella typhimurium forms a larger oligomer(s) that can hydrolyze ATP and hence activate transcription by the sigma(54)-holoenzyme form of RNA polymerase. Studies of Mg-nucleoside triphosphate binding using a filter-binding assay indic…
Dramatically different cavitation was produced by two separate acoustic pulses that had different shapes but similar duration, frequency content, and peak positive and negative pressure. Both pulses were produced by a Dornier HM-3 style lithotripter: one pulse when the ellipsoidal reflector was rigid, the other when t…
The mechanism of the light emission of single-bubble sonoluminescence (SBSL) is studied theoretically based on the quasiadiabatic compression model. It is concluded that SBSL is not the blackbody radiation but the thermal radiation. It is clarified that the shape of the spectrum is determined by the temperature inside…
The XPS technique in combination with microcalorimetry was used to picture the acid character of metal ion loaded zeolite and silica−alumina samples. Co, Cu, and Ni ions were loaded on ZSM-5 and SiO 2 −Al 2 O 3 (about 1 mmol/g) by three different procedures: ion exchange, impregnation, and solid-state ion-exchange. Th…
Non-covalently attached or soluble cell wall proteins of Saccharomyces cerevisiae were extracted using a high pH/2-mercaptoethanol procedure and were separated for peptide sequencing using 2D-PAGE. A partial N-terminal sequence of a major protein spot was obtained and showed high identity with enolase gene products. W…
The series of dinuclear 4,4′-bis(hexyloxy)azobenzene, [H(Azo-6)], cyclopalladated complexes of general formula [Azo-6)Pd(µ-X)]2, (X = Cl, Br, I, N3, SCN, OAc) and [Azo-6)2Pd2(µ-Ox)] (Ox = oxalate) have been synthesized and investigated for mesomorphism and spectroscopic properties. Single-crystal X-ray analysis of the…
Molecules of azaporphyrins combine two acidic pyrrole-type NH groups and several basic centres—two internal pyrrolenine nitrogen atoms and from one to four meso-nitrogen atoms—in one highly conjugated aromatic system. The acid–base properties of such unique multicentre ampholites have been the subject of numerous stud…
The results of electronic structure calculations of the induced dipoles and quadrupoles on an anion in a locally distorted rocksalt crystal are described. Such information is of interest in the construction of ionic interaction potentials and for modeling the dielectric behavior of ionic materials. The systems include…
We describe an experimental method for in situ resistivity measurements during the electrochemical hydrogen loading of thin, switchable metal hydride films. Using an oxygen‐free electrolyte we are able to measure the hydrogen concentration in the films quantitatively and to determine the pressure‐composition isotherms…
Electrochemistry and sonochemistry have been combined to prepare fullerene-like structures of MoS2 at room temperature and in high yield. Either electrodeposition or ultrasonic irradiation alone results in amorphous products, whereas the application of an electric current pulse followed by a burst of ultrasonic energy…
We have used genetic methods in Methanococcus maripaludis to study nitrogen metabolism and its regulation. We present evidence for a "nitrogen regulon" in Methanococcus and Methanobacterium species containing genes of nitrogen metabolism that are regulated coordinately at the transcriptional level via a common repress…
Methacryloyl-endfunctionalized block copolymers consisting of styrene and 2-vinylpyridine were polymerized to polyblockcomacromonomers with a much higher main chain than side chain degree of polymerization. Like homopolymacromonomers these molecules exhibit the structure of cylindrical brushes. Since the vinylpyridine…
The adsorption and photooxidation of CH 3 CN chemisorbed on TiO 2 has been investigated using infrared spectroscopy. It was found that CH 3 CN forms an ice layer on TiO 2 at 126K and above 126K CH 3 CN diffusion into TiO 2 occurs. At 200K, the adsorption of CH 3 CN on both isolated Ti−OH groups and on the Ti 4+ Lewis…
The interaction of 1,3,5-trinitrobenzene (TNB) with the basal siloxane surface of clay minerals is studied by ab initio computations of molecular models at the SCF, DFT (B3LYP), and MP2 levels of theory. A series of progressively increasing basis sets is used from the 6-31G up to the 6-311+G(d) set of atomic orbitals.…