Materials Literature
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Paracoccus denitrificans degraded poly(3-hydroxybutyrate) (PHB) in the cells under carbon source starvation. Intracellular poly(3-hydroxyalkanoate) (PHA) depolymerase gene (phaZ) was identified near the PHA synthase gene (phaC) of P. denitrificans. Cell extract of Escherichia coli carrying lacZ--phaZ fusion gene degra…
Climatic and soil factors responsible for the degradation of biodegradable plastics in soil were analyzed by placing poly-(3-hydroxy-butylate-valerate) (PHB/V), poly-(ɛ:-caprolactone) (PCL), poly-(butylene succinate) (PBS), poly-butylene succinate and adipate) (PBSA), and poly-lactide (PLA) in soil at 19sites in Honsh…
ABSTRACT: Light‐colored, dry collagen was obtained and, after dissolving in warm water, turned into soluble gelatin. The type of acid used influenced the gelatin viscoelastic and gelling properties. Acetic‐ and propionic‐acid extracts produced the gelatins with the highest elastic modulus, viscous modulus, melting tem…
Al 2 O 3 ‐based porous ceramics with high surface areas were fabricated by adding Al(OH) 3 to the starting powder, followed by pressureless sintering at temperatures >1100°C. Three types of starting powders were used in the present study: pure α‐Al 2 O 3 , α‐Al 2 O 3 + Al(OH) 3 , and α‐Al 2 O 3 + ZrO 2 + Al(OH) 3 .…
Single crystal x-ray diffraction, x-ray photoelectron spectroscopy and magnetic susceptibility measurements at normal pressure have shown that, in spite of two Jahn-Teller active ions in CuMn 2 O 4 , the crystal is cubic with partly inverse spinel structure, the inversion parameter being \mbox{$x = 0.8$}. The cation c…
ABSTRACT: Edible films produced from denatured pea protein concentrate (PPC) solution possessed the strength and elasticity to resist handling. Increasing the concentration of the plasticizer (glycerol) in the film decreased tensile strength and elastic modulus, and increased elongation and water vapor permeability (W…
The stretched polyaniline films doped by (±)-10-camphorsulfonic acid exhibited significant anisotropy of the electrical and thermoelectric properties. The thermoelectric figure-of-merit (ZT) of the stretched films in the direction parallel to the stretching direction is much higher than that of the unstretched counter…
We report on high-resolution specific-heat and magnetocaloric-effect measurements of the triangular-lattice antiferromagnets CsMn(Br_xI_{1-x})_3 with different x. The evolution of the magnetic phase diagrams from the easy-axis system for x = 0 to the easy-plane system for x = 1 was studied in detail. The specific-heat…
We propose a mechanism of stochastic resonance induced by spatial noise (electric random fields) in ferroelectrics. The calculations demonstrate the characteristic of the stochastic resonance: certain random field can increase the susceptibility, the phonon occupancy, and the overcooled temperature. This mechanics of…
Hard sphere systems in two dimensions are examined for arbitrary density. Simulation results are compared to the theoretical predictions for both the low and the high density limit, where the system is either disordered or ordered, respectively. The pressure in the system increases with the density, except for an inte…
This paper is an attempt to examine the commercial signficance of an agro-waste “Pineapple Leaf Fibre” (PALF) which is rich in cellulose, relatively inexpensive and has the potential for polymer reinforcement. The quality enhancement of PALF has been tried through different surface modifications like dewaxing, alkali…
We report the results of first-principles calculations on the structural properties (lattice constants and internal parameters), dielectric properties (macroscopic and static dielectric constants, and Born effective charge tensors), and dynamical properties $(\ensuremath{\Gamma}$-phonon frequencies) for the three poly…
Simulation results of dense granular gases with particles of different size are compared with theoretical predictions concerning the pair-correlation functions, the collison rate, the energy dissipation, and the mixture pressure. The effective particle-particle correlation function, which enters the equation of state…
One essential question in material sciences is how to bridge the gap between the microscopic picture and a macroscopic description. The former involves contact forces and deformations, whereas the latter concerns tensorial quantities like the stress or the velocity gradient. A two-dimensional shear-cell filled with di…
The soft modes in the two- and eight-direction order-disorder ferroelectrics are calculated under the mean-field approximation. We find that the conventional method of the pseudospin model to calculate the soft-mode frequency is incorrect, and present a valid modified method. It is demonstrated that the conventional m…
Ultrananocrystalline diamond (UNCD) films 0.1–2.4 μm thick were conformally deposited on sharp single Si microtip emitters, using microwave CH4–Ar plasma-enhanced chemical vapor deposition in combination with a dielectrophoretic seeding process. Field-emission studies exhibited stable, extremely high (60–100 μA/tip) e…
PURPOSE: To establish a method for measuring the partition coefficient (lambda) of gadopentetate dimeglumine in humans in vivo, evaluate the spatial and intersubject variation in the lambda of normal myocardium, and compare these values on a regional basis with lambda values of acute and chronic infarcted myocardium.…
Abstract Polymeric materials include plastics, gels, synthetic fibres, and rubbers. They are all-important both in industry and in daily life. Unlike liquid water, ice, or sugar solution, polymers are not homogeneous. They are said to consist of two or more phases, and their production and processing, as well as their…
The electrical properties of two single‐phase, lanthanum‐doped BaTiO 3 compositions, x = 0.03 and x = 0.20, in Ba 1– x La x Ti 1– x /4 O 3 were investigated by impedance spectroscopy after heat treatment in oxygen, argon, and air at 1350°C. Samples heated in oxygen were electrically insulating, whereas those heated in…
Abstract 46 structure types of binary and ternary intermetallic compounds have been derived from the well known, simple aristotype AlB 2 . Many compounds with the general compositions RX 2 , RT 2 , RTX , and R 2 TX 3 (R = alkaline earth, rare earth or actinoid metal; T = transition metal; X = main group element) belon…