Materials Literature
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Abstract Several new minerals, structurally and chemically similar to the hydrotalcite-manasseite group, have been found in the saline deposits of the central pre-Caspian depression and in those of Middle Asia. Their structures consist of layers of (Mg 1-x Al x )(OH) 2 plus interlayers of anions and molecular water. I…
In this study, the adhesive exopolysaccharides of strains of Pseudomonas putida and P. fluorescens, both isolated from freshwater epilithic communities, were examined with regard to their chemical composition, biosynthesis, and their role in adhesion. Electron microscopy showed that both strains were enrobed in fibrou…
The electrochemical behavior of a range of Al‐Ga alloys was determined in 4 M NaOH and 2 M NaCl both under normal polarization conditions and in a small battery designed for viewing reacted anodes in a scanning electron microscope. The observed behavior was compared with that of gallium and Ga‐0.1% Al. It was found th…
The equations governing the small-signal response of relaxing, nonresonant systems which may be described by a distribution of relaxation times (DRT) and/or a distribution of activation energies (DAE) are summarized and generalized and their implications discussed for several popular distributions. Much past work, bot…
In inner-shell photoionization followed by Auger decay, the Auger electron initially screens the ionic Coulomb field ``seen'' by the photoelectron. This screening phenomenon affects the post-collision interaction that shifts the Auger energy and distorts the line shape. The analytical Auger electron line-shape formula…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduction potentials and exchange reactions of thiyl radicals and disulfide anion radicalsParminder S. Surdhar and David A. ArmstrongCite this: J. Phys. Chem. 1987, 91, 26, 6532–6537Publication Date (Print):December 1, 1987Publication History Published online1 May 2002Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMathematical treatment of the wall loss of a trace species in denuder and catalytic converter tubesDaniel M. Murphy and David W. FaheyCite this: Anal. Chem. 1987, 59, 23, 2753–2759Publication Date (Print):December 1, 1987Publication History Published online1 May 2002Publishe…
Peptidyl-prolyl cis-trans isomerase was extracted from pig kidney cortex and partially purified. Enzyme activity was monitored against the cis-trans isomerization of succinyl-Ala-Ala-Pro-Phe-methylcoumaryl amide by means of a two-step process using chymotrypsin as the trans cleaving activity. The in vitro refolding of…
The development of a new translation-function program is reported. It is one that uses a linear correlation coefficient to determine the correct position of an oriented molecule in the crystal cell. The method has been implemented in a computer program called BRUTE . The program can also refine the orientation of the…
The physics of pyroelectric infra red detectors as it applies to the selection of detector materials is briefly reviewed and the properties of a number of the more commonly used materials are compared. The use of ferroelectrics in the region of the Curie temperature as dielectric bolometers with an applied bias field…
The ac response of polyaniline films on Pt electrodes in was measured at different applied dc potentials, varied in the positive and negative directions. Experimental complex capacitance plots were reproduced using a computer simulation program based upon the equivalent circuit approach. With 150 nm films the complex…
Abstract Polyanhydrides composed of the following diacids–sebacic acid, bis( p ‐carboxyphenoxy)propane, bis( p ‐carboxyphenoxy)hexane, isophthalic acid, 1,4‐phenylene dipropionic acid, and dodecanedioic acid–were synthesized by a melt polycondensation process. Polymers of molecular weight up to 137,010 (weight average…
Several layered perovskites $A_2Ln_2Ti_3O_{10}$ (A = K or Rb; Ln = rare earth) and their monohydrates, crystg. in tetragonal structures related to ${Sr_4Ti_3O_10}$, were prepd. The alkali ions in $K_2Ln_2Ti_3O_{10}$ are topochem. exchanged by protons in aq. acid or by other alkali ions in molten salts. $H_2Ln_2Ti_3O_{…
An investigation of the temperature programmed desorption (TPD) of CO and D2 from Ni(111) has been carried out. It has been shown that a differential method for the extraction of the kinetic parameters, threshold temperature programmed desorption (TTPD), can be applied with accuracy near the limit of zero coverage. In…
Critical conditions for shear localization in thermoviscoplastic materials are obtained in closed form for idealized models of simple shearing deformations. The idealizations, which include the neglect of heat conduction, inertia, and elasticity, are viewed as quite acceptable for many applications in which shear band…
ADVERTISEMENT RETURN TO ISSUEPREVArticleEffects of steric factors on the electrosynthesis and properties of conducting poly(3-alkylthiophenes)J. Roncali, R. Garreau, A. Yassar, P. Marque, F. Garnier, and M. LemaireCite this: J. Phys. Chem. 1987, 91, 27, 6706–6714Publication Date (Print):December 1, 1987Publication His…
A large number of species usually placed in Fragilaria have been examined, mainly by scanning electron microscopy. As a result Fragilaria is more narrowly circumscribed, with F.capucina as the type species. Six species are definitely placed in Fragilaria and others noted for further investigation. Five genera are sepa…
The topology of the integral membrane protein MalF, which is required for maltose transport in Escherichia coli, has been analyzed using fusions of alkaline phosphatase (EC 3.1.3.1). The properties of such fusion strains support a MalF structure previously proposed on theoretical grounds. Several transmembrane segment…
This book comprises an introductory lecture outlining the basic concepts and challenges in the field. This is followed by a collection of reprinted articles which are important in understanding the subject. The book will focus mainly on mathematical and physical foundations of the subject rather than experimental prog…