Materials Literature
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The Lactobacillus bulgaricus beta-galactosidase gene was cloned on a ca. 7-kilobase-pair HindIII fragment in the vector pKK223-3 and expressed in Escherichia coli by using its own promoter. The nucleotide sequence of the gene and approximately 400 bases of 3'- and 5'-flanking sequences was determined. The amino acid s…
A microscopic expression for the frequency and wave vector dependent dielectric constant of a dense dipolar liquid is derived starting from the linear response theory. The new expression properly takes into account the effects of the translational modes in the polarization relaxation. The longitudinal and the transver…
Cyclically induced crack propagation occurs in alumina subjected to direct tension—compression loading. The crack increment per cycle (da/dN) has a power‐law dependence on the peak stress intensity factor (K max ). Cyclic crack growth can occur at lower values of K max than are required to produce static fatigue effec…
Abstract A series expansion distribution function of the structure amplitude | F | has been used to calculate the generalised cumulative distribution function N n ( z ) for hypersymmetric crystals when there are n -fold repetitions of motifs at regular intervals ‘ d ’ along a straight line (both centrosymmetric and no…
The KMF 3 structures with M = Mn, Fe, Co and Ni have been investigated in detail using data from previous studies. The vibration amplitudes, atomic charges determined by difference density partitioning and the heights of characteristic features of the difference densities change monotonically through the series. Trend…
Abstract A kinetic model was developed to describe the rate of reaction between chromium(III) and polyacrylamide (PAAm) that leads to the crosslinking or gelation of the polymer. Cr(III) was added directly to solutions of polyacrylamide which had a degree of hydrolysis of approximately 4%. The unreacted Cr(III) was se…
Abstract The study of certain radioluminescence characteristics of stilbene single crystals is performed. Doping the stilbene melt with electron‐seeking (ES) addition agents of benzol and benzophenone halogen derivatives allowed to control the structure perfection of the crystal grown. The root‐mean‐square random orie…
High-resolution heat-capacity measurements have been made on mixtures of alkylphenyl-cyanobenzoyloxy benzoate (${\mathrm{DB}}_{\mathrm{n}}$CN) and cyanobenzoyloxypentyl stilbene (${\mathrm{C}}_{5}$stilbene). The mixtures ${\mathrm{DB}}_{5}$CN+${\mathrm{C}}_{5}$stilbene (with mole fraction of ${\mathrm{C}}_{5}$stilbene…
Article Properties of Formal Low-Valence Transition Metal — Hydrogen Complexes in Mg2NiH4 and Na2PdH2* was published on February 1, 1989 in the journal Zeitschrift für Physikalische Chemie (volume 163, issue 2).
Abstract Following a preliminary report stating that ethylboron sesquitriflate initiates the polymerization of hexamethylcyclotrisiloxane (D 3 ), a more rigorous investigation was carried out to ascertain that cyclic siloxanes can indeed be polymerized by Lewis acids without the intervention (cocatalysis) of proton‐do…
A detailed study of AISI(1) 304 and 316 stainless steels (SSs) has been conducted to correlate the degree of sensitization (DOS) measured by the electrochemical potentiokinetic reactivation (EPR) test and by the ASTM(2) A262 Practice E test. Commercial grade AISI 304 and 316 SSs were sensitized by isothermal aging at…
The nature of the nematic-smectic A (NA) phase transition is discussed in the light of the available experimental data on N(p-n-pentyloxy benzylidene)p-n-alkyl anilines, 50.m series of compounds. The experimental data elucidate the interesting aspects and it is confirmed that the 50.m homologues have a unique place in…
Abstract Glauconite from the oxidized and reduced zones of soil-geologic columns at two Coastal Plain sites, one in Maryland and one in New Jersey, was examined by Mössbauer spectroscopy. The data indicate that glauconite in the reduced zones had a higher proportion of its structural iron in the ferrous, as opposed to…
Abstract In this paper the electromagnetic inductance (EMI)‐shielding of metal‐and ferroelectric‐particle filled polymers is described. The composite, containing only metallic fillers, has a shielding effectiveness comparable to conventional products. The addition of a few percent of ferroelectric material to this com…
<div class="htmlview paragraph">Standard salt spray corrosion tests have been used with die cast AS41 samples of controlled purity to define the critical iron, nickel, and copper contaminant levels, up to which excellent corrosion performance can be obtained, and beyond which the corrosion rates accelerate rapid…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical quenching and chemical reaction of singlet molecular oxygen with azo dyesPietro Bortolus, Sandra Monti, Angelo Albini, Elisa Fasani, and Silvio PietraCite this: J. Org. Chem. 1989, 54, 3, 534–540Publication Date (Print):February 1, 1989Publication History Published…
A laboratory scale high temperature heat storage unit comprising a container loaded with catalytically activated magnesium hydride has been built which is interconnected to a second one filled with the commercially available alloy Code 5800. Thermodynamic analyses showed that this combination of metal hydrides can be…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and mechanism of the hydroxyl + hydroperoxo reactionJames J. Schwab, W. H. Brune, and James G. AndersonCite this: J. Phys. Chem. 1989, 93, 3, 1030–1035Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published inissue 1 February…
The CO adsorption site occupations on Fe(111) have been determined as a function of coverage and temperature using temperature programmed desorption (TPD) and time-resolved electron energy loss spectroscopy (TREELS). CO does not adsorb in a thermally equilibrated distribution among the four adsorption sites at 100 K;…
The electrochemistry and photoelectrochemistry of nominal one monolayer coverages of RuO 2 deposited by thermal decomposition of RuCl 3 on anodically grown TiO 2 films are examined. The anodic TiO 2 films, characterized by electron diffraction before and after thermal treatment, were found to be polycrystalline rutile…