Materials Literature
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Local phase separation at the growth front of a spherulite has been found during crystallization in a polymer mixture of poly(\ensuremath{\epsilon}-caprolactone) and polystyrene. The phenomenon can be qualitatively explained by the coupling between the preferential rejection of impurities (polystyrene) during crystall…
The up-conversion of infrared radiation into green, red, and 805-nm fluorescence has been studied for ${\mathrm{Er}}^{3+}$ and ${\mathrm{Tm}}^{3+}$ ions in both ${\mathrm{Yb}}^{3+}$-doped and non-${\mathrm{Yb}}^{3+}$-doped ${\mathrm{BaF}}_{2}$-${\mathrm{ThF}}_{4}$ fluoride glass over a wide temperature range and sever…
The nature of the species formed in solutions of [MoO4]2– and [WO4]2–(1–0.1 mol dm–3) in the presence of H2O2(5–0.5 mol dm–3) from pH 12 to acid has been studied by Raman and i.r. spectroscopy and, for molybdenum-containing species, by 95Mo n.m.r. spectroscopy. The polymerisation processes are far less complex in the…
The nature of heterogeneous deformation bands and the mechanism of Goss texture formation have been studied in the process of cold rolling and annealing of 3%Si–Fe (111)[112] single crystals. After cold rolling, two kinds of shear bands are observed. Wide shear bands (type I) make an angle of 35° to the rolling direct…
The corrosion rate of AA(1) 7075 aluminum alloy in 0.1 M sodium chloride solution is decreased by the addition of 1000 ppm of FeCl2, cocl2, NiCl2, YCl3, LaCl3, NdCl3, PrCl3, or CeCl3. In each case, the protective cation is slowly incorporated into the oxide film which develops on the alloy surface during exposure to t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBroensted superacidity of hydrochloric acid in a liquid chloroaluminate. Aluminum chloride - 1-ethyl-3-methyl-1H-imidazolium chloride (55.O m/o AlCl3)G. P. Smith, A. S. Dworkin, R. M. Pagni, and S. P. ZinggCite this: J. Am. Chem. Soc. 1989, 111, 2, 525–530Publication Date (P…
Catalysis, Mechanisms, and Kinetics of Polymerization. Reactivity in radical copolymerization. Synthesis of Polymers and Novel Structures. Synthesis and properties of dendrimers and hyperbranched polymers. Advanced Polymer Characterization Methods. Recent advances in optical microscopy and its application to the chara…
A B S T R A C T: A study of the ion-exchange properties of montmorillonite has been performed in order to facilitate computer predictions of the chemical properties of natural fluids and mineral assemblies. Clay/electrolyte interactions can be described using a technique based on the concept of hypothetical surface co…
Two series of discotic liquid crystals, one based on metal-free and the other on copper containing phthalocyanine (Pc) as the central core and eight peripherally n-alkoxy groups (C6–C12) as substituents have been synthesized and their mesomorphic properties and structural parameters have been determined. These compoun…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSmall-angle x-ray scattering characterization of agarose sols and gelsM. Djabourov, A. H. Clark, D. W. Rowlands, and S. B. Ross-MurphyCite this: Macromolecules 1989, 22, 1, 180–188Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Published…
Mutants of Escherichia coli deficient in the fermentative NAD-linked lactate dehydrogenase (ldh) have been isolated. These mutants showed no growth defects under anaerobic conditions unless present together with a defect in pyruvate formate lyase (pfl). Double mutants (pfl ldh) were unable to grow anaerobically on glu…
The roles of the catalytic active-site residues aspartic acid-52 and glutamic acid-35 of chicken lysozyme (EC 3.2.1.17) have been investigated by separate in vitro mutagenesis of each residue to its corresponding amide (denoted as D52N and E35Q, respectively). The mutant enzyme D52N exhibits approximately 5% of the wi…
The extracellular poly(3-hydroxybutyrate) depolymerase gene from Alcaligenes faecalis T1 was cloned into Escherichia coli DH1 by using the plasmid pUC8. An A. faecalis T1 genomic library was prepared in E. coli from a partial Sau3AI digest and screened with antibody against the depolymerase. Of the 29 antibody-positiv…
—ESCA, wettability measurements, SEM, weight-loss determinations, and an ink adhesion test were used to characterize low-molecular-weight oxidized materials (LMWOM) formed during the corona-discharge treatment of polypropylene film. Water-soluble LMWOM is readily formed by scission processes occurring during corona tr…
Abstract
The crystal structure of the 80,000 Da Fe-S enzyme aconitase has been solved and refined at 2.1 A resolution. The protein contains four domains; the first three from the N-terminus are closely associated around the [3Fe-4S] cluster with all three cysteine ligands to the cluster being provided by the third domain. Asso…
Oxygen-based plasmas commonly used in resist stripping and multilayer resist patterning are contrasted to highlight the differences involved in these applications. Mechanisms for polymer etching are reviewed, with particular emphasis on silicon-containing resists proposed for bilayer lithography. While silicon-contain…
What does viscous fingering have in common with crystal growth? It is not only the visual similarity of the patterns the two seemingly unrelated phenomena can generate under certain circumstances, but also the same underlying physics which controls both growth processes. The common behaviour - diffusion limited growth…
We present a review of the experimental aspects of research on the blue phases of chiral liquid crystals. First a general description of blue phases is given and their relation to other important condensed matter problems is mentioned. Experimental proof for the existence of blue phases is followed by a description of…
The properties of amorphous materials determined by the presence of localized atomic and electronic states are reviewed. Experimental data on atomic dynamics in glasses are described. The two-level-system (TLS) model is presented, and the limits of its applicability analysed. The concept of soft atomic potentials, all…