Materials Literature
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Abstract The clay and bulk mineralogy of soil and till from 26 Adirondack watersheds was studied. The materials consist typically of quartz, K-feldspar, plagioclase, mica, vermiculite, and kaolinite. Talc, smectite, halloysite, and hornblende are present in some samples. The clay fraction of the soils is composed pred…
1-Aminocyclopropane-1-carboxylate (ACC) synthase (EC 4.4.1.14), extracted from tomato pericarp tissue, was purified 6500-fold by conventional and high-performance liquid chromatography. Two-dimensional gel electrophoresis of this preparation indicated that ACC synthase activity was associated with a protein band at 50…
Interactions between homogeneous acetate kinase and proteins of the phosphoenolpyruvate:glucose phosphotransferase system (PTS) were studied. The phosphorylation of D-glucose was followed spectrophotometrically using a coupled assay system, and acetate kinase and GTP were found to substitute for phosphoenolpyruvate pr…
It is shown that in fixing the crossed Nicols positions a systematic error must invariably be introduced caused by the parasitic ellipticities of the polarizer and analyzer and the refraction of the light beam by the specimen. A method has been derived by which this systematic error can be removed from the original HA…
Two kinds of novel antithrombogenic polyurethane materials were synthesized. One of them is a polyetherurethane with anionic charges on the film surface, and the other is a polyetherurethaneurea to which heparin was covalently bound. The mechanism of their antithrombogenicity was investigated. The anionic polyetherure…
Abstract The reaction behavior of such bis cyclic‐imino‐ethers as 2, 2′‐bis(2‐oxazoline), which had been proved in the previous paper to be an effective chain extender to couple carboxyl terminals of linear polyesters through addition reaction, has been studied to evaluate their practical applicability as the chain ex…
The location measure of a residue in a globular protein is defined as the number of C alpha atoms surrounding the residue located within a sphere of the radius of 14 A. This quantity is a measure of the exposure of a residue to solvent, and is related closely to the distance from the center of mass of a protein. In th…
Acetate kinase from Salmonella typhimurium and Escherichia coli was purified to electrophoretic homogeneity. The amino acid compositions of both proteins were similar, and the apparent molecular weights were the same, about 40,000 for the putative monomers. The native proteins gave higher molecular weights, suggesting…
The distribution and organization of type I and type V collagens were studied in the embryonic chicken cornea using anti-collagen, type specific, monoclonal antibodies and immunoelectron microscopy. These studies were performed on lathyritic 17-day corneas treated at 4 degrees C or 37 degrees C. At the lower temperatu…
The subsolidus phase relationships in Si 3 N 4 –AlN–rare‐earth oxide (Me 2 O 3 where Me=Nd, Sm, Gd, Dy, Er, and Yb) systems were studied. Solid‐solution regions with the α‐Si 3 N 4 structure were delineated along the Si 3 N 4 –“Me 2 O 3 :9AIN” joins for all of the rare‐earth oxide systems studied. The solubility limit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAluminum siting in mordenite and dealumination mechanismPhilippe Bodart, Janos B. Nagy, Guy Debras, Zelimir Gabelica, and Peter A. JacobsCite this: J. Phys. Chem. 1986, 90, 21, 5183–5190Publication Date (Print):October 1, 1986Publication History Published online1 May 2002Pub…
Six Amphora species [A. affinis Kützing, A. copulata (Kützing) nov. comb., A. marina W. Smith, A. ovalis (Kützing) Kützing, A. proteus Gregory, A. robusta Gregory] belonging to the subgenus Amphora Cleve were observed on strewn slides in the British Museum (Natural History). Light microscope photographs of examples co…
The electrical resistivities and activation energies for electric conduction in glasses of the system Na 2 O-V 2 O 5 -B 2 O 3 with V 2 O 5 <15 mol.%, have been measured. Two types of conductivities are postulated: ionic conductivity in the higher temperature region and electronic conductivity in the lower temperature…
Examen des legeres differences entre les structures des phases β et α' afin d'interpreter l'apparition d'une modulation dans la transition β⇄α'
This paper describes a study of the effect of a cationic softening agent on the processes involved in pulling out a single warp yarn from a plain weave cotton fabric. In par ticular, measurements are made of the pull-out force and the corresponding yarn and fabric deformations, and these parameters are compared with t…
We consider random interfaces generated by level crossing of a Gaussian random field. Transition from an isolated pattern to a percolating one is discussed by calculating the Euler characteristics of the interface and the number of local minimum of the generating Gaussian field. These topological invariants are shown…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPromotion effects of vanadium, niobium, molybdenum, tungsten, and rhenium oxides on surface reactions in the carbon monoxide hydrogenation over ruthenium/aluminum oxide catalystToshiaki Mori, Akira Miyamoto, Naoki Takahashi, Masato Fukagaya, Tadashi Hattori, and Yuichi Murak…
A method for measuring the specific heat of small samples at low temperatures is described. In this method C p is evaluated by directly comparing the heating and cooling rates of the sample temperature without explicit use of the thermal conductance between sample and bath.
An axial gradient, infrared optical material, ZnSxSe1−x, has been developed by codepositing ZnS and ZnSe in a controlled manner via a chemical vapor deposition process. This material has been characterized by measuring the compositional and refractive-index profiles, visible, and IR transmission, microstructure, and h…
Abstract Experiments on the conversion of feldspar to illite reveal that variation of the fluid/rock ratio (flow rate) has a significant effect on the kinetics of feldspar dissolution and illite formation. Dissolution of albite in near-neutral KCl solution at 200°C and 500 bar shows that the Si and Na release rate per…