Materials Literature
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Partial table of contents: Molecular Biophysics of Elastin Structure, Function and Pathology (D. Urry, et al.). Ultrastructure of Elastin (I. Pasquali-Ronchetti, et al.). GENERAL DISCUSSION I: HYDROXYLATION OF THE PENTAPEPTIDE VGVPG IN OVINE ELASTIN. Structure of the Elastin Gene (J. Rosenbloom, et al.). Catalytic Pro…
In this preliminary study, the authors have developed a soil analysis method based on the automated particle search and classification capabilities of a scanning electron microscope equipped with an energy dispersive x-ray spectrometer (SEM-EDX). Innovative sample preparation maximized dispersion and density of soil p…
A well-defined X-ray fiber pattern of chitosan acetate was obtained by immersing a tendon chitosan, prepared from a crab tendon chitin by a solid-state N-deacetylation, in an aqueous acetic acid-isopropanol solution at 110°C. This pattern was very similar to that of chitosan salts with some inorganic acids, such as HF…
Liquid-crystalline complexes of palladium and platinum are formed when the metals are complexed to stilbazoles (4-styrylpyridines) bearing either two or three alkoxy chains. The complexes, termed polycatenar, show smectic C mesophases for most 3,4-disubstituted ligands, while the use of trisubstituted ligands leads to…
The x-ray photoemission spectra of the ethylene, butadiene, and hexatriene compounds were investigated using one-particle Green's function calculations which are exact up to third order in correlation. This study points to the importance of initial-state correlation and cross-section effects for a consistent reproduct…
Based on a microstructural approach, granular material can be represented by an equivalent continuum of the high-gradient type. The high-gradient model is used in this paper to study the effect of microstructure on the propagation of waves in granular material. The constitutive coefficients of the high-gradient contin…
Ammonia thermodesorption using a thermal conductivity detector does not allow an unambiguous study of the acidic properties of strong solid acids such as heteropolycompounds and sulfated zirconia. As a matter of fact, these strong acids release compounds other than NH 3 during TPD experiments which obviously involves…
The synthesis, photophysical properties and singlet oxygen yields of a range of polyether substituted metallo and free-base phthalocyanines are reported and discussed in the context of the potential use of these compounds as alternatives to haematoporphyrin derivatives (HpD) in the photodynamic therapy (PDT) of cancer…
Abstract The volatility behavior of perfume compounds in poly(ethylene oxide)/poly(propylene oxide)/poly(ethylene oxide) copolymer was investigated by means of dynamic and static headspace analyses. Suppression of the volatility of perfume compounds by EO 105 PO 27 EO 105 copolymer was markedly greater than by polyeth…
Nitrogen atom transfer from salen-derived nitridomanganese(V) to manganese(III) Schiff-base complexes occurs under aerobic conditions in solution at room temperature. A mechanism involving chloride dissociation followed by the formation and decay of a binuclear μ-nitrido-activated complex accounts satisfactorily for t…
Optical interference coatings have been designed by using combinations of wavelets (fully apodized sine-wave refractive index groups). Like a single-line rugate filter, a single wavelet produces a stop band without harmonics and, in addition, has no sidelobes. The rules for combining wavelet refractive index structure…
Transferable potentials have been derived by computer modelling of the series of higher titanium oxides, from Ti 2 O 3 (with Ti 3+ ions) to TiO 2 (with Ti 4+ ions), and including the lower members of the series of phases, Ti n O 2n-1 , which have mixed oxidation states; some of these are described as crystallographic…
The first example of a spin-crossover iron(II) compound with a large negative third-order polarizability, associated with an instantaneous electronic response, is reported; magnetic measurements show that this compound, cis-bis(thio-cyanato)bis[N-(2-pyridylmethylene)aminobip henyl]iron(II), characterized by X-ray stru…
Abstract To predict B behavior in soils and its influence on plants, it is crucial to understand the mechanisms of B sorption by mineral phases. Because B reacts with clay minerals and Al and Fe oxides, it should also sorb to poorly crystalline aluminosilicates such as allophane. Boron sorption, with and following all…
The effectiveness of anti-cancer drug therapies is often limited by the difficulty of achieving drug delivery throughout solid tumors. Mathematical models permit an analysis of the factors leading to inadequate drug delivery to tumors and can suggest strategies for improving delivery. An overview is given of key facto…
Melt polymerisation of N-acryloyl-1,2-diaminoethane hydrochloride gives the hyperbranched hydrochloride salt analogues of Tomalia’s poly(amidoamine) dendrimers, for which spectroscopic analysis establishes a branching ratio close to one.
Self-assembled ordered cetyltrimethylammonium bromide (CTAB) is used as a template for the synthesis of mesoporous silicoaluminophosphates with varying Si/Al ratio.
Recently a mode coupling theory for the dynamics of solutions and melts of entangled linear chain polymers has been developed. We report the extension of this approach to macromolecular architectures different from linear chains. Specifically, this work addresses recent experimental findings on melts of ring shaped po…
Millimetre-sized mesoporous silica spheres, the sizes of which could be controlled by the mixing speed of the preparation solution, have been prepared directly from the reaction of tetraethoxysilane with tartaric acid in cyclohexanol by the sol–gel process. The silica gel spheres calcined at 400 °C showed specific sur…
The synthesis, X-ray structural characterization, and Mössbauer and magnetic properties of the two pentanuclear complexes [Fe 5 (μ 3 -F) 2 (XDK) 2 (L) 4 (O 2 CPh) 4 ], where L = pyridine (py) or N -methylimidazole ( N -MeIm), are described. Reaction of [Fe(H 2 O) 6 ](BF 4 ) 2, the deprotonated dinucleating dicarboxyla…