Materials Literature
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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…
The fact that a titanium screw can be implanted into the mastoid portion of the human skull, at the same time establishing a permanent, reaction-free skin penetration, has made it possible to attach a new bone conduction hearing aid directly to the skull. To understand and improve this new method of bone stimulation,…
Foe nearly three decades people have employed an equation derived by Frenkel to describe the strain energy of an atom diffusing in a glass. This equation describes the strain energy to enlarge a spherical cavity and predicts physically unreasonable results. An alternative equation for a circularly symmetric enlargemen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganometallic chemistry of rhodium tetraphenylporphyrin derivatives: formyl, hydroxymethyl, and alkyl complexesBradford B. Wayland, Seth L. Van Voorhees, and Charles WilkerCite this: Inorg. Chem. 1986, 25, 22, 4039–4042Publication Date (Print):October 1, 1986Publication His…
Abstract Simplified vent sizing equations for emergency relief requirements in reaction kettles and storage vessels are obtained from analytical consideration. Venting modes include homogeneous‐vessel venting, all‐vacor venting, and all‐liquid venting; energy sources due to runaway chemical reactions and external heat…
Abstract Surface‐enhanced Raman scattering (SERS) of adenine, adenosine, 2′‐deoxyadenosine, 5′‐dAMP, 5′‐rAMP, 5′‐rADP and 5′‐rATP adsorbed on aqueous Ag sol has been investigated. A shift of the adenine ring breathing mode from 746 to 735 cm −1 with increasing adenine concentration is interpreted as reflecting the reo…
A quasicrystal may be described by its quasilattice and its atomic decoration. We discuss two different commonly used methods for decorating quasilattices which lead to inequivalent real-space structures, the tile-decoration method and the hyperlattice-decoration-and-projection method. It is shown that diffraction pat…