Materials Literature
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Porous hydroxyapatite bioceramics were developed by a new direct consolidati on method based on the foaming capability of egg white and on its gelling pr operties on heating, thus acting both as pore former and consolidator agent. The bubble forming capability of fresh egg white, due to the presence of a globular prot…
The effect of lycra fil ament and full relaxation finisH on the extension at peak load. immediate recovery , delayed recovery, permanent set and resiliency of cotton-Iycra blended knitted fabric has been studied. It is observed that for lycra blended fabric, the immediate recovery, extension and resiliency are higher…
By using additional fuel enrichment, the influence of an electrical heater and the oxidation of unburnt exhaust gases on the reaction of an electrically-heated catalyst under cold-start condition of a four-stroke motorcycle engine was investigated. The effects of different cold-start enriching times, heating temperatu…
The extinction coefficient determined by light scattering on liquation particles in a glass has been calculated, taking into account interparticle interference. The calculations use several types of pairwise particle-correlation functions. It is shown, in particular, that using Debye and Percus-Yevick pairwise correla…
The sol−gel process of 1,8-bis(triethoxysilyl)octane (TES-Oct) catalyzed by phosphotungstic acid (PWA) has been investigated by time-resolved dynamic light scattering. The time−intensity correlation functions (ICF) exhibited two modes, corresponding to the cooperative diffusion of entangled chains and the translationa…
Copper-cadmium ferrite substituted with different rare earth ions R (R=La,Sm, Gd and Dy) are investigated. The temperature dependence of theelectrical resistivity (ρ) and thermoelectric power (α) are measured and hencethe mobility is calculated. The electrical resistivity is increased with increasingthe ionic radius o…
The luminescence decay times τlum of the complexes of the ions Tb(III), Eu(III), Sm(III), Dy(III), and Yb(III) with dipicolinic acid (DPA) dissolved in protonated and deuterated water, methanol, and dimethyl sulfoxide are measured. The values of τlum for crystals H3[Ln(DPA)3]·nH2O and their aqueous solutions coincide,…
Au/TiO 2 nanocomposites were prepared by a hybrid route consisting in the rf sputtering of gold on porous titania xerogels [TiOx(OH)y(OR)z] obtained by means of the sol-gel route. In particular, titania substrates were prepared on silica slides by dip-coating starting from ethanolic solutions of Ti(OPri)4 (OPri=iso-pr…
Water wetting is a crucial issue in carbon dioxide (CO2) corrosion of multiphase flow pipelines made from mild steel. This study demonstrates the use of a novel benchtop apparatus, a horizontal rotating cylinder, to study the effect of water wetting on CO2 corrosion of mild steel in two-phase flow. The setup is simila…
The poly(hydroxy-amide) [PHA] family of polymers possess not only high temperature stability, but also form a more thermally stable polymer (polybenzoxazole) [PBO] during thermal decomposition. The synthesis occurs in solution at low temperature, preventing premature ring cyclization to PBO. The molecular structure wa…
Abstract Two metallocene ethylene‐oct‐1‐ene copolymers, differing in comonomer content and in molecular weight, were cross‐linked either by dicumyl peroxide or β ‐radiation. The effect of high comonomer content on the crystalline morphology, once the materials were cross‐linked, was analyzed by differential scanning c…
SUMMARY Three fragilarioid diatom taxa were studied in detail at the light microscopy and scanning electron microscopy levels from samples collected from Lake Hovsgol, Mongolia. Two of the taxa are new to science, described here as Staurosirella minuta Morales et M. B. Edlund and Pseudostaurosira tenuis Morales et M.…
Fluorvesuvianite was found in the abandoned Lupikko iron mine, Pitkaranta, Karelia, Russia. It occurs in cavities of chloritized diopside skarn, as radiating aggregates of acicular crystals in calcite. Crystals (up to 1.5 cm long and 5-20 mum across) are elongate along [001]; the dominant forms are {100} or {110}. Ass…
Foi realizado um estudo da flora perifítica de diatomáceas (Bacillariophyceae) existente no Rio Jaú, tributário do Rio Negro, Amazônia (2º57'S e 61º49'W). As coletas foram realizadas manualmente nas cheias de 1995, 1996 e 1997, e as lâminas permanentes encontram-se depositadas no Herbário FLOR, Universidade Federal de…
In order for engineered tissues to find clinical utility, the engineered tissues must function appropriately. However, smooth muscle (SM) tissues engineered in vitro with a conventional tissue engineering technique may not exhibit contractile functions, because smooth muscle cells (SMCs) cultured in vitro typically re…
X-ray powder diffraction (XRD) data for six pure fluoroquinolone antibiotic drugs, ciprofloxacin, norfloxacin, enrofloxacin, ofloxacin, pefloxacin and sparfloxacin have been obtained using a powder diffractometer. The drugs were scanned from a Bragg angle (2theta) of 10 degrees to 70 degrees. The obtained data were ta…
The aim of this work was to study the effect of the formation of more heat-stable conformers of chicken egg ovalbumin during incubation at basic pH (9.9) and elevated temperature (55 degrees C) on the protein aggregation properties at neutral pH. Native ovalbumin (N-OVA) is converted on the hours time-scale into more…
There is great interest in the investigation of heterodimers formed by metalloporphyrins and metallophthalocyanines grafted with oppositely charged substituents, since these systems are models of the photosynthetic special pair and promising unidirectional electron transfer molecular devices. In the present study new…
Abstract Light‐induced spin‐polarized transient EPR spectra are reported for several water‐soluble copper porphyrins. The spectra are assigned to the doublet ground state, with emissive spin polarization resulting from photoexcitation and subsequent electronic relaxation. In contrast to other systems for which polariz…
The crystal structure of CaZr(PO 4 ) 2 was determined from conventional X-ray powder diffraction data using direct methods, and it was further refined by the Rietveld method. The structure was orthorhombic (space group P 2 1 2 1 2 1 , Z =4) with a =1.448 76(4), b =0.672 13(1), c =0.623 47(2) nm, and V =0.607 10(3) nm…