Materials Literature
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The time dependence of the complex dielectric permittivity of lead magnoniobate (PMN) single crystal in an applied external DC field, was studied. The field was applied in a “zero-field-cooling” regime. All measurements were carried out for the low-temperature PMN non-ergodic glassy phase. The transition to the polar…
Abstract Grafting of polypropylene was carried out in both boiling xylene and decalin as solvent medium with itaconic acid (2‐methylenesuccinic acid) as functional polar monomer using 2,5‐dimethyl‐2,5‐bis( tert ‐butylperoxy)hexane (Lupersol 101) as radical initiator. It was found that the temperature influenced the pe…
Transition temperatures, transition enthalpies and entropies of different mesophases of the binary mixture of cholesteryl pelargonate (ChP) and nonyloxybenzoic acid (NOBA) have been measured on a differential scanning calorimeter and optical textures of different mesophases have been confirmed on a polarizing microsco…
Abstract Continuous wave and pulsed electron paramagnetic resonance spectroscopies combined with thermal and chemical methods were used to identify and characterize V(TV), Fe(III), Mn(II) and Cr(III) in a multimineral system that consists of vermiculite and impurities of carbonates. All of these transition metals were…
Polarized Raman spectra of LBO single crystal were recorded in the temperature range 300–870 K. At room temperature, 26A1, 27A2, 26B1 and 26B2 modes expected from group theoretical analysis are observed by various scattering geometries. Among them, the internal bands are tentatively assigned to vibrations of the BO3 t…
The oscillator strengths and relative vibronic intensity distribution of the ${(}^{2}$${\mathit{F}}_{5/2}$)${\mathrm{\ensuremath{\Gamma}}}_{8}$,${\mathrm{\ensuremath{\Gamma}}}_{7}$\ensuremath{\leftarrow}${\mathrm{\ensuremath{\Gamma}}}_{6}$${(}^{2}$${\mathit{F}}_{7/2}$) transitions of the ${\mathrm{YbCl}}_{6}^{3\mathrm…
A systematic study of carrier dynamics in oxidized porous silicon (PS) has been carried out using both steady-state and time-resolved photoluminescence (TRPL) measurements probed by tunable excitation over the photon energy range 3.68–1.94 eV for a temperature range 20 K to room temperature. The TRPL results show two…
Lactate dehydrogenase from the hyperthermophilic bacterium Thermotoga maritima has been functionally expressed in Escherichia coli. As shown by gel-permeation chromatography, dynamic light scattering, and ultracentrifugation, the recombinant protein forms homotetrameric and homooctameric assemblies with identical spec…
The experimental x-ray-excited Auger lineshapes for graphite, diamond and polyethylene have been obtained. The comparison ofN(E) C KVV spectral features of graphite, diamond and polyethylene has also been carried out. The coincidence of C KVV Auger lineshape and energy position between diamond and polyethylene spectra…
Bolometer elements in large arrays, at a pitch from 100 down to 40μm, offer uncooled and simple operation in thermal imaging applications. A hybrid array technology, exploiting the pyroelectric property of ferroelectric ceramic materials in the bolometer elements, has produced a range of successful linear and 2-D arra…
Barkhausen noise from small samples of an Fe-based Metglas showed partial reproducibility. Small changes in the swept field completely scrambled the pattern of Barkhausen jumps. For some sweep parameters, the Barkhausen pulses switched randomly between two patterns on successive sweeps. These results require that the…
We performed a complete study of the nucleation and growth kinetics of chemical-vapor-deposition (CVD) diamond on Si(100). The diamond film was grown using the microwave-assisted MWACVD method and the substrate was preliminary pretreated by ultrasonic agitation with 300 μm diamond grains, which provides a high nucleat…
Pavement cells from the leading and trailing edges of the gill filament of Hoplias malabaricus , exhibit a complex system of microridges, a long tight junction and a large number of desmosomes . Pavement cells from the secondary lamellae are smooth surfaced with clearly defined cell boundaries by a circular microridge…
Abstract An attempt was made to simulate carbon gasification with the aid of molecular orbital theory. A simple Hückel method was applied to calculate molecular orbitals of a large polynuclear aromatic molecule, which was employed as a model crystallite for carbon. A free valence at each carbon atom in model crystalli…
Two peaks of glutamine synthetase (GS) activity were resolved by anion-exchange chromatography from the marine diatom Skeletonema costatum Grev. The second peak of activity accounted for greater than 93% of total enzyme activity, and this isoform was purified over 200-fold. Results from denaturing gel electrophoresis…
Abstract Poly(o-aminobenzoic acid) and copolymers of o-aminobenzoic acid and aniline were synthesized as excellent candidates for the precursor of polyaniline. The reaction conditions were optimized with emphasis on the isolated yield. The polymers were characterized by a number of techniques including infrared spectr…
The production of cold shock proteins (csps) and cold acclimation proteins (caps) was characterized in the psychrotrophic bacterium Pseudomonas putida Q5 and its transconjugant P. putida Q5T which contains the toluene-degradative TOL (pWWO) plasmid, using two-dimensional gel electrophoresis and computing scanning lase…
RATIONALE AND OBJECTIVES: A series of studies was conducted to determine whether metal complexes of the EOB-DTPA type are useful as contrast agents for computed tomography (CT). METHODS: Metal complexes using EOB-DTPA as ligand were synthesized with lanthanide metal ions (lanthanum [La], cerium [Ce], praseodyme [Pr],…
The magnetic hyperfine splitting frequencies of (i) $^{57}\mathrm{Ni}$ in Fe ${(}^{57}$NiFe), (ii) $^{57}\mathrm{Ni}$ in Ni ${(}^{57}$NiNi), and (iii) $^{59}\mathrm{Fe}$ in Fe ${(}^{59}$FeFe) were measured with the technique of nuclear magnetic resonance on oriented nuclei (NMR-ON) at low temperatures. The NMR-ON spec…
The three-dimensional structure of the complexes of ribonuclease A with cytidyl-2',5'-adenosine (2',5'-CpA) and deoxycytidyl-3',5'-deoxyadenosine [3',5'-d(CpA)] in aqueous solution has been determined by 1H NMR methods in combination with restrained molecular dynamics calculations. Twenty-three intermolecular NOE cros…