Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAssociation, photodimerization, and induced-fit types of host-guest complexation of anthracene-appended .gamma.-cyclodextrin derivativesAkihiko. Ueno, Fumio. Moriwaki, Tetsuo. Osa, Fumio. Hamada, and Koichi. MuraiCite this: J. Am. Chem. Soc. 1988, 110, 13, 4323–4328Publicati…
The construction of interpenetrating networks is the fascinating possibility of‐fered by tetracarboxylic acids containing tetrahedrally directed carboxyl groups. In the crystal they can form concatenated, diamondoid networks held together by pairs of hydrogen bonds. The cavities are filled owing to the interpenetratio…
We discuss the dynamics of the formation of liquid crystalline phase of rod-like polymer solutions, particularly the behavior of spinodal decomposition which should be observed when the system is suddenly brought into a thermodynamically unstable region. The growth rate of the concentration fluctuation is calculated a…
MERLOT is an integrated package of computer programs for the determination of initial models of crystal structures using the molecular replacement technique. The package includes two programs for calculating the rotation function, three methods for solving the translation problem (a translation function, a packing fun…
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…