Materials Literature
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The polymer composites of HDPE and banana, hemp, and agave fibers (50 : 50, w/w) were prepared separately with and without treatment of maleic anhydride. The swelling phenomenon in terms of absorption of water and steam was studied and it was found that the steam penetrates more within a smaller period of time than th…
An experiment is described in which polystyrene films containing various levels of plasticizers are prepared by solution-casting onto steel test panels. These films are subsequently tested for hardness using a pencil hardness technique, impact resistance using a drop weight test, and glass transition temperature using…
Discontinuous translational elongation of polypeptides is observed during spider dragline silk fibroin synthesis (1,2). The repeating segment of one of the two subunit proteins constituting spider major ampullate (dragline) silk of Nephila clavipes, Spidroin 2, consists of alternate alanine-rich and proline-rich regio…
First-principles quantum chemical techniques on cluster models have been used to investigate the photoabsorption of the peroxide linkage defect in silicate glasses. The effects of geometry, basis sets, and cluster size have been considered carefully to derive converged values for the low-lying excitation energies. The…
The optimization of the InP liquid encapsulated Czochralski systems is usually difficult, time consuming and very expensive. Here, the relative importance of the different growth parameters (e.g., pull rate, system temperatures and geometry) on the growth interface deflection, the temperature gradients within the melt…
The effects of salinity on the incidence of pseudo-auxospore formation and the size of initial cells were examined at 15, 20, 25, 30, and 35PSU (Practical Salinity Unit) during vegetative cell enlargement of the giant diatom Coscinodiscus wailesii Gran grown in culture. Mean percentages of pseudo-auxospore formation r…
ABSTRACT The influence of starch addition on the elastic properties of fish‐meat gel was studied by measuring compression and stress relaxation properties and dynamic viscoelasticity. Samples with pregelatinized starch, with and without raw starch, and processed starch were used. Fish‐meat gels with starch showed a hi…
ABSTRACT Edible coating formulations were made with food‐grade polyvinyl acetate (PVA) dissolved in alcohol‐water mixtures. PVA coatings had high gloss and relatively high permeance to O 2 and water vapor, and they formed glossy surfaces on chocolate candy, citrus fruit, and apples. Addition of propylene glycol helped…
Abstract Lu et al.'s modeling of gas‐solid reaction demonstrated the significant influence of mass transfer on the global transformation of consolidated porous reactive media with reactive gas at low pressure and low permeability. Their model coupled mass transfer with chemical kinetics at the grain level and heat tra…
The effective microbial production of copolyesters of 3-hydroxybutyrate (3HB) and 4-hydroxybutyrate (4HB) with high mole fractions of 4HB units by a wild-type strain of Ralstonia eutropha H16 was investigated in culture solutions containing 4-hydroxybutyric acid (4HBA) and various carbon substrates in the presence of…
Metal chelates of three grades of carboxymethyl cellulose (CMC) (LI-L3) with Cu(II) ions, either originating from CuCl2 or CuSO4, were prepared and characterized by elemental analysis, infrared spectra, and electrical conductivity studies. The results showed that the degree of substitution of CMCs and the origin of th…
Theoretical considerations of changes in fiber length during technological processes are presented along with an experimental study. Special attention is paid to the combing process. A comparison of fiber length results measured by AFIS and MShU is given at different stages along the particular technological processes.
Using the method of nonequilibrium molecular dynamics, the behavior of the Mi\ifmmode \mbox{\c{e}}\else \c{e}\fi{}sowicz, Helfrich, and Leslie viscosities as functions of temperature and density are investigated. In particular, attention is focused on the region immediately preceding the nematic-smectic phase transiti…
Abstract Crystallization behavior and rheological properties of blends of bisphenol‐A polycarbonate (PC) and polypropylene (PP) prepared by screw extrusion have been investigated by differential scanning calorimetry (DSC), polarized‐light microscopy, scanning electron microscopy, and a Rheometrics Mechanical Spectrome…
We investigate electroconvection of nematic liquid crystals in planar 90 degrees twist cells in the dielectric regime. These cells provide competing boundary conditions for the nematic director at both electrodes. When the ratio of cell gap and roll width is not too small (in thin cells and at low frequencies), the co…
Glucoside derivatives of some UV absorbers have been prepared and investigated as photostabilizers for PVC in absence and in presence of Ca-Zn stearate. The results indicate a reasonable stabilizing effect of the glucosides compared with the parent UV absorbers. The prepared glucosides were also investigated as therma…
Sustainable land use in periodically dry Brazilian savannas requires a water‐saving management. We hypothesized that the annual course of matric potentials (ψ M ) in very‐fine, isohyperthermic Anionic Acrustoxes of Pinus plantations (PI), degraded (DP) and productive pastures (PP), no‐till (NT) and conventional tillag…
Solid polymorphism of four compounds of the type [M(NH 3 ) 6 ](XY 4 ) 2 , where M = Co 2+ or Cd 2+ , and XY 4 = ClO 4 - or BF 4 - has been studied at 100 -300 K by DSC. One or two phase transitions of the investigated compounds have been found. For the compounds with M = Co the phase transitions have not yet been desc…
Abstract Rapidly crystallized blends of metallocene isotactic polypropylene and propylene‐ethylene random copolymers with an ethylene content varying from 0.76 to 7 mol% were found to cocrystallize to different degrees depending on the composition of the comonomer and content of copolymer in the blend. The degree of m…
The crystal structure of the tetrameric glycolytic enzyme phosphoglycerate mutase from the yeast Saccharomyces cerevisiae has been determined to 1.7 A resolution in complex with the sugar substrate. The difference map indicates that 3-phosphoglycerate is bound at the base of a 12 A cleft, positioning C2 of the substra…