Materials Literature
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The effects of different relative humidities on some physical properties of three types of calfskin parchment (vellum) were investigated. Standard samples were subjected to (1) tensile fracture, and (2) measurement of the force that developed when the restrained samples were subjected to step decreases in relative hum…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of the interface between pyromellitic dianhydride/oxydianiline polyimide and silver using surface-enhanced Raman scatteringJ. T. Young, W. H. Tsai, and F. J. BoerioCite this: Macromolecules 1992, 25, 2, 887–894Publication Date (Print):January 1, 1992Publicat…
Abstract The syntheses of several functionalised aryl cyanate esters bearing reactive allyl groups are presented. The monomers were purified (to c . 98%) using preparative HPLC and a range of techniques, including heteronuclear nuclear magnetic resonance (NMR) spectroscopy, was employed in their characterisation. A mo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of biodegradable aromatic anhydride copolymersAbraham Domb J.Cite this: Macromolecules 1992, 25, 1, 12–17Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pubs.acs.org/…
The interactions between several commonly used preservatives, i.e. benzalkonium chloride, chlorhexidine gluconate, chlorobutanol, methylparaben and propylparaben, and 2-hydroxypropyl-β-cyclodextrin were investigated. The interactions were shown to be twofold. Firstly, the preservative molecules can displace the drug m…
General and pitting corrosion resistance of a SAF 2205 alloy with varying σ phase contents has been investigated in a 10%H2SO4 solution and a 3·5%NaCl solution. It was found that the presence of the σ phase decreased the corrosion potential of SAF 2205 in H2SO4 and NaCl. Only at a σ phase content of more than 21% does…
Two new oxypregnane-oligoglycosides named calotroposides A (1) and B (2) have been isolated from the root of Calotropis gigantea (Asclepiadaceae), an Indonesian medicinal plant, and their chemical structures have been elucidated by chemical and spectroscopic methods as 12-O-benzoyllineolon 3-O-beta-D-cymaropyranosyl(1…
Poly(2,2′-bipyridine-5,5′-diyl)(PBpy), a π-conjugated electrically conducting chelate polymer, forms electrochemically active complexes with Ru and Ni; a cyclic voltammogram of the Ru-complex shows redox peaks which are accounted for by assuming electron exchange between the Ru species through the polymer backbone, an…
Investigation of mechanisms of the surface deterioration of the roll for the hot strip rolling is very important for the development of the new roll material. Then, several experiments are conducted based upon results obtained by earlier investigations, and considerations concerning it are given.The experiments are a…
A series of NiO/γ-alumina and NiO/La2O3–γ-alumina catalysts prepared by impregnation have been investigated by X-ray diffraction, diffuse reflectance spectroscopy and temperature-programmed reduction. For the NiO/γ-alumina catalysts with low nickel oxide content, a strong interaction between NiO and γ-alumina leads to…
The first non-calamitic/disc-shaped metal organyl series 3 and 6 containing two or even four palladium atoms and eight or twelve flexible side chains presented here have been synthesized via the novel roof-shaped/bent dimers 2 or (the thermomesomorphic) 5, respectively. In addition, from the chemical point of view the…
The ~nduction of sexuality was documented during a fall bloon~ of the marine diatom Ditylum brightwellii.Large numbers of cells bearing male and female gametes and some resting spores occurred simultaneously.When laboratory cultures of D. brightwellii became sexual after nitrogen starvation, sinking rates of cells in…
The controlled growth of semiconductor clusters from a precursor phenyl-capped CdS molecule, [Cd10S4(SPh)16]4–, by the addition of stoichiometric amounts of sulfide ion has led to a material having a sharp (full width at half-maximum at room temperature ≈ 800 cm–1) excitonic feature at 351 nm (3.53 eV) in its absorpti…
A TGM beamline for the spectral range 12–310 eV is being built at Laboratório Nacional de Luz Síncrotron (LNLS). This beam line consists of safety devices, a condensing mirror, a toroidal grating monochromator, and a refocusing mirror. This beam line has been assembled up to the exit slits. A spherical grating monochr…
Oxidative deprotonation of [M(P)(NH2But)2][M = Ru, Os; P= porphyrin dianion] gives [Ru(P)(O)(NBut)], [Os(P)(O)(NBut)]and [OS(P)(NBut)2], which are characterised by IR and 1H NMR spectroscopy.
[4′-(Dimethylamino)biphenyl-4-yl]dimesitylborane (BNB) and 4-[4′-(Dimethylamino)pnenylazo]phenyldimesityl-borane (BNA) have been investigated by X-ray diffraction; crystallographic data were used to calculate dipole moments in the ground state and the hyperpolarizability coefficient βo was measured by the EFISH techni…
An important step in understanding how a protein folds is to determine those regions of the sequence that are critical to both its stability and its folding pathway. We chose phosphoribosyl anthranilate isomerase from Escherichia coli, which is a monomeric representative of the (beta alpha)8 barrel family of proteins,…
The aging of epoxy electrical insulation by unipolar, repetitive voltage surges has been investigated to determine whether such surges can precipitate premature failure of high-voltage motor windings and gas insulated switchgear spacers. A full factorial statistical test was devised and performed on 180 pure epoxy ins…
Chitosan-like materials were extracted from five different fungal cells with NaOH and acetic acid, with the yields varying from 1.2 to 10.4% of the dry fungal cell weight. The degree of N-acetylation of the extracts measured by the colloidal titration method varied considerably depending on the individual species. By…
Crystal geometry and symmetry Diffraction geometry and its practical realization Preparation and examination of specimens Determination of lattice parameters Interpretation of diffracted intensities Measurement of intensities Refinement of structural parameters Basic structural features Precautions against radiation i…