Materials Literature
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The levels of seven intermediary enzymes involved in acetate and butyrate formation from acetyl coenzyme A in the saccharolytic anaerobe Clostridium acetobutylicum were investigated as a function of time in solvent-producing batch fermentations. Phosphate acetyltransferase and acetate kinase, which are known to form a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOctahedral vs. trigonal-prismatic coordination and clustering in transition-metal dichalcogenidesMiklos Kertesz and Roald HoffmannCite this: J. Am. Chem. Soc. 1984, 106, 12, 3453–3460Publication Date (Print):June 1, 1984Publication History Published online1 May 2002Published…
Better understanding of the fundamental electrical properties of polymeric materials is a key to their further progress in the practical application, not only as electrical insulating materials, but also as functional elements. In this paper, recent topics and their important results will be reviewed on electrical con…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDimagnesium iron(II) hydride, Mg2FeH6, containing octahedral FeH64- anionsJ. J. Didisheim, P. Zolliker, K. Yvon, P. Fischer, J. Schefer, M. Gubelmann, and A. F. WilliamsCite this: Inorg. Chem. 1984, 23, 13, 1953–1957Publication Date (Print):June 1, 1984Publication History Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleFrom organic metals to superconductors: managing conduction electrons in organic solidsF. WudlCite this: Acc. Chem. Res. 1984, 17, 6, 227–232Publication Date (Print):June 1, 1984Publication History Published online1 May 2002Published inissue 1 June 1984https://pubs.acs.org/doi/1…
SUMMARY The stability of aggregates from 26 soils selected from agricultural areas was measured by wet‐sieving and the results correlated with sand, silt, clay, nitrogen, organic matter and iron contents and with cation exchange capacity. Highly significant correlations were obtained for the relationships between aggr…
A nonlinear calibration curve for volume fraction vs integrated intensity ratio was obtained for the monoclinic-tetragonal ZrO2 system by using X-ray powder pattern-fitting and pattern-decomposition techniques. The empirical equation agrees well with the theoretical one. By using this equation, the deviation from line…
The interactions between charged colloidal particles with sufficient strength to cause crystallization are shown to be describable in terms of the usual Debye–Huckel approximation, but with a renormalized charge. The effective charge in general is smaller than the actual charge. We calculate the relationship between t…
Heterogeneous and homogeneous processes in the formation of diamond at low pressures, where diamond is a metastable modification of carbon, are discussed. Data on the kinetics of the growth of diamond from hydrocarbons under conditions which give codeposition with graphite are reported, together with data on the influ…
The ultramicrostructure of commensurate graphite intercalation compounds has been investigated using high-resolution transmission electron microscopy. By directly examining the intercalate lattice at atomic resolution, the authors have discovered intercalate domains of nearly macroscopic dimensions (>1000 AA) exten…
Single-phase LaNi 1-x Mn x O 3 samples in the compositional range 0<or=x<or=0.2 were prepared by the decomposition of precursor hydroxide solid solutions, and La 2 NiMnO 6 was prepared from a mixture of carbonates. All the samples contained a disordered array of nickel and manganese ions. X-ray absorption and XP…
Field-induced reorientations of liquid crystals, far from equilibrium, produce spatially periodic responses. The wavelength selected maximizes response speed. A detailed analysis of the effect in a novel geometry is presented, along with a discussion of its general importance in polymerlike liquid crystals.
An ODMR study at 1.6K shows that the 3.4 eV luminescence of Y 2 O 3 originates in a triplet state. The results are consistent with an intrinsic trapping mechanism for excitons. The nature of the trapping mechanism is discussed. Results of an ODMR study of SC 2 O 3 are also reported, using the 3.6 eV luminescence.
The dc conductivity of a-Se and binary amorphous SeTe, SeGe, and SeSb films is measured as a function of temperature (80 to 300 K) and film thickness (500 to 2000 Å). It is found that except for SeSb films, the conduction in all the samples takes place in the tails of localized states via thermally activated tunne…
The thermal conductivity of Ge doped with electroneutral impurities, Si, Sn and the acceptor impurity, Al, is investigated in the temperature range 80 to 400 K. It is established that at equal impurity concentrations the temperature dependence of the thermal conductivity in Ge doped with the electroactive impurity Al,…
The dislocation dynamics in MgO single crystals containing some hundred ppm of aliovalant impurities is investigated by three experimental techniques: in-situ deformation experiments in the high-voltage electron microscope, stress pulse-etching experiments on individual dislocations, and macroscopic deformation experi…
The thermoelectric properties of polycrystalline samples of GeTe-rich side solid solutions (GeTe)1−x·(AgSbTe2)x, for the compositions x = 0.00, 0.10, 0.15, 0.20, and 0.29 are investigated. The temperature dependences of the Seebeck coefficient and the electrical resistivity and the dependences of the total thermal con…
An optical method of measuring and displaying depth information has been developed which is based on the Fresnel diffraction properties of coherently illuminated gratings. Cosine modulated gratings are found to be more flexible than simple gratings for depth measurement. A pair of gratings crossed at right angles is u…
The Raman spectrum of solid silicon at the melting temperature has been obtained. A silicon film on a quartz substrate was radiantly heated with the use of 10.6-\ensuremath{\mu}m radiation from a C${\mathrm{O}}_{2}$ laser while the Raman scattering was excited by a pulsed Ar-ion laser. The results indicate that the si…
We present a new multiplet theory that separates mean-field from multiplet effects in the excitation and donor-acceptor ionization spectra of localized impurities. Analysis of the experimental data for all $3d$ impurities in ZnO, ZnS, ZnSe, and GaP for which sufficient data exist and for the bulk Mott insulators CoO,…