Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSome reactions and properties of molecular diatomic carbon C2. An experimental and theoretical treatmentPhilip S. Skell, Lloyd M. Jackman, Sheikh Ahmed, Michael L. McKee, and Philip B. ShevlinCite this: J. Am. Chem. Soc. 1989, 111, 12, 4422–4429Publication Date (Print):June…
Mammalian and Escherichia coli succinate dehydrogenase (SDH) and E. coli fumarate reductase apparently contain an essential cysteine residue at the active site, as shown by substrate-protectable inactivation with thiol-specific reagents. Bacillus subtilis SDH was found to be resistant to this type of reagent and conta…
Previously published observations on chromosome numbers for 43 diatom taxa are reviewed. Members of five centric families, as well as araphid, monoraphid and biraphid pennate species are included in the list. Greatest range in diploid complement is found in the biraphid group, where the smallest (8) and largest (130)…
To assess the utility of skin wipes as an index of exposure to polycyclic aromatic hydrocarbons (PAHs), simultaneous skin wipe and breathing zone air samples were obtained for 10 roofers. Samples were obtained during removal of an old coal-tar pitch roof and application of a new asphalt roof. Skin wipes were obtained…
Abstract Isothermal enthalpy relaxation in polystyrene was measured as a function of temperature and molecular weight on a differential scanning calorimeter. Relaxation spectra were derived from the data and expressed as a distribution of relaxation times. For a given molecular weight the relaxation spectra at differe…
Copper(I) oxide films were prepared on copper substrates by exposing them to solutions containing Cu 2+ ions, and it was observed that the photoresponse of these films electrodes in a photoelectrochemical cell is both n- and p-type. However, it was observed that the n-type behaviour of these film electrodes could be e…
SUMMARY A model which describes the reaction of anions and cations with soil when they are added separately was applied to the results of Roy et al. (1986a,b ) in which pair‐wise combinations of phosphate, arsenate, and molybdate competed for sorption on three soils. The model postulates that the reaction is between i…
Abstract The thermal degradation of three aliphatic polythiocarbonates was investigated by direct pyrolysis in the ion source of a mass spectrometer operating both in electron and chemical ionization modes. The overall evidence indicates that these polymers start decomposing at about 250–280°C by an end‐biting process…
Comparisons of experimental optical and acoustical bubble size spectra disagree in size distribution at the low end of the spectrum. Previous methods of obtaining acoustic bubble size information relied strictly on resonant acoustical scattering and absorption theory. For some plausible distributions, these traditiona…
The concept of using engineering principles as an aid in designing textile fabrics with desirable aesthetic characteristics is further developed. Fundamental to this ap proach is the measurement of fabric mechanical and surface properties, e.g., fabric tensile, shear, bending, surface, and lateral compression properti…
New polyesters prepared by the intefacial polycondensation of 2,6-bis(4- hydroxybenzylidene ) cyclohexanone (I) and 2,6-bis(4-hydroxy-3-methoxybenzylidene)- cyclohexanone (II) with 4,4'-diphenic, isophthalolyl, terephthaloyl, adipoyl and sebacoyl dichlorides have been produced. The yield and the values of reduced visc…
Abstract The structure of solvated cadmium(II) ion and the tetrathiocyanatocadmate(II) complex in N,N-dimethylformamide (DMF) has been determined by means of X-ray diffraction at 25 °C. The radial distribution curve for a cadmium(II) perchlorate DMF solution is well explained in terms of the presence of the octahedral…
A two‐step electrolytic anodization process, denoted as the "soft/hard" process, has been studied as a means of fabricating a high quality dielectric. A layer of porous (soft) anodized aluminum followed by boric acid barrier (hard) anodization produced a dense amorphous aluminum oxide with excellent dielectric propert…
Abstract Aiming application of the high hole drift mobility in organopolysilanes, the organopolysilane-based organic layered photoreceptors for electrophotography have been developed with phthalocyanine pigments as a photo-generating material. The photoreceptor combined with titanylphthalocyanine exhibited the high se…
A combination of electrochemical and radiotracer methods offers a unique possibility of studying the motion of counter‐ and co‐ions during electrochemical transformations occurring in a polymer film. In addition, information can be obtained about the embedding of electrolytes during electropolymerization penetration o…
Twin‐related (tetragonal (T), rhombohedral (R)) adjacent ferroelectric domains, which require a smaller energy for the rotation of the polarization vector, have been found to occur in lead zirconate titanate type piezoceramics at the morphotropicphase boundary, explaining the triplet splitting observed in electron dif…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrostatic properties of L-alanine from x-ray diffraction at 23 K and ab initio calculationsRiccardo Destro, Riccardo Bianchi, and Gabriele MorosiCite this: J. Phys. Chem. 1989, 93, 11, 4447–4457Publication Date (Print):June 1, 1989Publication History Published online1 Ma…
Nonreciprocal devices based on a section of two coupled lines containing ferrite magnetized in the propagation direction are investigated. The necessary conditions for nonreciprocal operation are derived. Several configurations are proposed and their scattering matrices are given. An explanation of the action of exper…
The sexual reproduction of Navicula oblonga is described. Cells aggregate actively and lie side-by-side, touching each other as they enter meiotic prophase. In contrast to some other species traditionally included in Navicula, the gametangia do not subsequently separate and no copulation envelope is produced. Each gam…
Abstract During the thermo‐oxidation at 90°C of unsubstituted or N‐substituted aliphatic polyamides, formation of products which absorb in the UV and visible regions is observed. These products are photo‐instable either at short wavelengths or at long wavelengths and their photo‐reactivity is wavelength dependent. The…