Materials Literature
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The intrasubband collective excitations in semiconductor superlattice systems have been investigated within a simple model theory with the use of a two-dimensional δ function for the charge-density profiles. In particular, the coupling of the plasmons to the LO (longitudinal optical) phonons is accounted for. The coup…
The NAD-dependent glutamate dehydrogenase from Phycomyces spores was purified more than 300-fold. Estimation of Mr by gel filtration gave a value of 98,000 whereas after SDS-PAGE one major band of Mr 54,000 was found, suggesting that the enzyme is a dimer. The enzyme was virtually dependent on the presence of AMP for…
Following the idea of performing tests in environmental conditions as similar as possible to the real working ones, many sets of partial discharge tests carried out on an epoxy resin within a broad environmental temperature range are reported on. Life tests were carried out on specimens with a calibrated, enclosed cav…
The luminescence and energy transfer properties of the system Gd 1 − x Eu x ( IO 3 ) 3 ( 0.005 ⩽ x ⩽ 1 ) have been investigated. In Eu ( IO 3 ) 3 diffusion limited energy migration occurs at T > 25 K . The diffusion constant has only a weak temperature dependence. The IO 3 − group does not luminesce. A comparison is m…
The electric‐field‐induced strain in single‐crystal BaTiO 3 was investigated. For crystals relatively free of twinning, a longitudinal strain of 0.35% can be induced just above the ferroelectric‐paraelectric phase transition temperature (T c1 ) primarily by field‐forced paraelectric‐ferroelectric phase transition. For…
Article Mikroseigerungen - eine leicht übersehene Einflußgröße bei der Gefügebeschreibung von Gußwerkstoffen / Microsegregations — an Easily Unnoticed Influencing Variable in the Structural Description of Cast Materials was published on June 1, 1988 in the journal Practical Metallography (volume 25, issue 6).
The diatom flora in two series of samples collected, one in 1961/2 and the other in 1983, from the thermal spring complex at Gross Barmen near Okahandja in South West Africa/Namibia are documented. Taxonomic notes are provided for most of the 63 taxa recorded, and each taxon confirmed as present is illustrated with li…
Abstract Primäre, sekundäre und tertiäre Amine wurden allein oder in Kombination mit Kaliumhydroxid bzw. Natriumethylat als Spaltagens für die chemische Zersetzung von PDMS‐Netzwerken eingesetzt. Die Bindungsspaltung findet sowohl im Netzknoten als auch an den Netzkettengliedern statt. Der Anteil der Spaltprodukte in…
Abstract Imogolite, protoimogolite and two synthetic allophanes (A and B) with very different Si/Al ratios have been pyrolysed over a range of temperatures, and the reactions followed by high-resolution solid-state 27 AI and 29 Si nuclear magnetic resonance (NMR) spectroscopy. The Si(OAl oct ) 3 OH groups of protoimog…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanical relaxations of oriented gelation-crystallized polyethylene filmsS. K. Roy, T. Kyu, and R. St. John ManleyCite this: Macromolecules 1988, 21, 6, 1741–1746Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Published inissue 1 June 198…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeformation-dependent properties of polymer networks constructed by addition of crosslinks under strainL. G. Baxandall and S. F. EdwardsCite this: Macromolecules 1988, 21, 6, 1763–1772Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Publishe…
Abstract Three new electron donors, 5,6-dihydroacenaphtho[5,6-cd]-1,2-dithiole (1a), -diselenole (1b), and -ditellurole (1c) have been prepared with a view to developing new electron donors for low-dimensional molecular complexes. Their donor characters are markedly enhanced as compared with the corresponding dichalco…
For the first time the composition of the bufadienolide complex in URGINEA HESPERIA Webb & Berth. has been investigated. From an extract of lyophilized plants, thirteen bufadienolides were isolated. By means of FAB-MS, (1)H-NMR, and (13)C-NMR studies the compounds were structurally elucidated as scillarenin, scillipha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new sulfur-bridged iridium(I)-iridium(I) compound and its conversion to a compound containing a metal-metal bond. Crystal structures of Ir2(SPh)2(COD)2 and Ir2Cl2(.mu.2-SPh)2(COD)2F. Albert Cotton, Pascual Lahuerta, Julio Latorre, Mercedes Sanau, Isabel Solana, and Willi S…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, electrochemistry, and spectroelectrochemistry of (P)Ge(Fc)2 and (P)Ge(C6H5)(Fc): first example of metal-carbon-.sigma.-bonded porphyrins with two different axial groupsQ. Y. Xu, J. M. Barbe, and K. M. KadishCite this: Inorg. Chem. 1988, 27, 13, 2373–2378Publicatio…
The photosynthetic pigments of 51 species (71 isolates) of tropical and sub-tropical diatoms from 13 out of 22 families were examined. These were the Thalassiosiraceae, Melosiraceae, Coscinodiscaceae, Rhizosoleniaceae, Biddulphiaceae, Chaetoceraceae, Lithodesmiaceae, Eupodiscaceae, Cymatosiraceae, Diatomaceae, Navicul…
An approximate 3-dimensional analysis to study the effects of a system of transverse and longitudinal matrix cracks in cross-ply laminates is given. The method considers a repeating unit cell containing three subcells in every one of which the displacement vector is expanded to second order. The equilibrium equations,…
The competitive effect of the inorganic anions OH-, Cl-, Br-, I-, ClO-4, NO-3, SO2-4, CO2-3 and phosphates on the behavior of copper in alkaline aqueous solutions at pH 12 was investigated. The nature of changes occurring on the copper surface was analyzed by potentiodynamic and potentiostatic methods in conjunction w…
(1) Proteolytic digests of tissue elastin contain material which reacts with dimethylaminobenzaldehyde in acid solution (Ehrlich's reagent) to give a cherry-pink colour. This Ehrlich chromogen(s) [EC(s)] is similar to but not identical with EC(s) previously demonstrated in tissue collagens [Scott, Hughes & Shuttlewort…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanisms of ring-opening polymerization of 2-(perfluoroalkyl)-2-oxazolines initiated by sulfonates: a novel covalent-type electrophilic polymerizationMasatoshi Miyamoto, Keigo Aoi, and Takeo SaegusaCite this: Macromolecules 1988, 21, 6, 1880–1883Publication Date (Print):Ju…