Materials Literature
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Abstract Greenhouse and laboratory experiments conducted with a clayey kaolinitic isohyperthermic Typic Haplustox from the Cerrado region of Brazil showed that CaCO 3 , CaSiO 3 , and previous P applications decreased P fixation and improved cation retention properties. The amendments were added at rates to replace 1 o…
Abstract Four Indian varieties of silk viz., Mulberry, Tasar, Eri, and Muga, have been investigated by x‐ray diffraction and infrared spectroscopy. The hydrolysis for Mulberry was carried out using 6 N HCI at 40°C, whereas the other wild varieties of silk were hydrolyzed partially using 8 N HCI at 40°C. The x‐ray orde…
The chemisorption of oxygen on clean polycrystalline indium surfaces is investigated by the combined techniques of x-ray photoelectron spectroscopy (XPS) and the static mode of secondary ion mass spectroscopy (SIMS). Oxygen uptake is characterized by a moderately rapid formation of In2O3, with no preoxidation adsorbed…
We have simulated the properties of an ensemble of biaxial particles interacting via an anisotropic pair potential, truncated at the second rank terms, using the Monte Carlo technique. The particles are confined to the sites of a face centred cubic lattice and the interactions are restricted to nearest neighbours. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAggregation of amphiphiles in nonaqueous mediaE. Ruckenstein and R. NagarajanCite this: J. Phys. Chem. 1980, 84, 11, 1349–1358Publication Date (Print):May 1, 1980Publication History Published online1 May 2002Published inissue 1 May 1980https://pubs.acs.org/doi/10.1021/j10044…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton nuclear magnetic resonance spectrometry for determination of substituents and their distribution in carboxymethylcelluloseFloyd F. L. Ho and Daniel W. KlosiewiczCite this: Anal. Chem. 1980, 52, 6, 913–916Publication Date (Print):May 1, 1980Publication History Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalculation of Elastic and Piezoelectric Constants of Polymer Crystals by a Point Charge Model: Application to Poly(vinylidene fluoride) Form IKohji Tashiro, Masamichi Kobayashi, Hiroyuki Tadokoro, and Eiichi FukadaCite this: Macromolecules 1980, 13, 3, 691–698Publication Da…
The thermal and guanidine hydrochloride (GdnHCl) denaturation of lysozyme has been investigated at various concentrations of tri-N-acetylglucosamine ((GlcNAc)3), a trisaccharide which binds specifically at the active site of native lysozyme. The presence of (GlcNAc)3 leads to a readily observable stabilization of the…
The silicon content of five species of marine planktonic diatoms grown in laboratory culture was measured by a method involving soda hydrolysis of cells collected on polycarbonate filters. An increase in the temperature or light intensity during growth resulted in an increase in the Si content in some species and a de…
The contribution of the associated steps to the properties of grain-boundary dislocations are investigated. Two methods of step-height determination are given and it is shown that the step height, like the Burgers vector, must be conserved during the reactions of grain-boundary dislocations: this is not always automat…
The free-volume model, recently extended by the present authors to account for the equilibrium thermodynamic behavior of dense liquids and glasses, is used as a basis for a relaxation theory of the kinetic effects observed in the heat capacity ${C}_{p}$ near the glass transition temperature ${T}_{g}$. Most importantly…
Abstract Cellulose mesophases were obtained by preparing concentrated solutions of cellulose (20–55%) in a mixture of N ‐methyl‐morpholine N ‐oxide (MMNO) and water. The anisotropy depends on four interconnected parameters: the temperature of the solution which, in general, must be lower than 90°C; the concentration o…
The superspace-group approach [Janner & Janssen (1977), Phys. Rev. B, 15, 643-658] is used to solve the symmetry problem of incommensurate crystal phases in the case of displacive- and occupation-wave modulation. Generalization is given to cover magnetic modulation as well. The symmetry conditions imposed by the super…
X-ray diffraction studies to 2.8-A resolution have yielded the three-dimensional structure of mitochondrial aspartate aminotransferase (L-aspartate:2-oxoglutarate aminotransferase, EC 2.6.1.1), an isologous alpha 2 dimer (Mr = 2 x 45,000). The subunits are rich in secondary structure and contain two domains, one of wh…
We present electron spin resonance studies of the magnetic defect in undoped polyacetylene. Temperature dependences of the absorption spectra of (CD)x and (CH)x over the range 2–295 K have been obtained. The properties of the magnetic defect in fully isomerized trans samples and in cis-rich samples are compared. The d…
The degradation phenomena caused by dc and ac biasing in non-Ohmic ZnO ceramics are studied from the viewpoints of voltage (V)-current (I) characteristics, dielectric properties, and thermally stimulated current (TSC). As a result, it is concluded that the degradation caused by dc biasing is attributed to the asymmetr…
α-, β- und γ-Cyclodextrin sind aus sechs, sieben bzw. acht Glucoseeinheiten bestehende, ringförmige Oligosaccharide, die in großtechnischem Maßstab aus Stärke gewonnen werden können. Sie bilden Einschlußverbindungen mit kleineren Molekülen, die in ihren 5-8 Å weiten Hohlraum hineinpassen. Diese (kristallinen) Komplexe…
The kinetics of triple-helix formation in type III pN-collagen, type III collagen and a quarter fragment of type III collagen was followed by optical rotation and circular dichroism. Kinetic intermediates were detected by trypsin digestion and polyacrylamide gel electrophoresis. The end products of refolding at 25 deg…
Retention of known geometry, with regard to mean atomic positions, has proved useful in the refinement of macromolecules. In structures with a paucity of diffraction data and large displacements of the atoms from their mean positions, it is also of value to restrain the thermal factors to be consistent with known ster…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNuclear magnetic resonance spectroscopy of lanthanide complexes with a tetraacetic tetraaza macrocycle. Unusual conformation propertiesJ. F. DesreuxCite this: Inorg. Chem. 1980, 19, 5, 1319–1324Publication Date (Print):May 1, 1980Publication History Published online1 May 200…