Materials Literature
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The precipitation reaction between aminotri(methylenephosphonic acid) (ATMP), a phosphonate used for scale prevention in high-water-volume industrial processes such as petroleum production, and calcium was systematically studied. By varying the precipitating conditions, three distinct precipitates formed: a crystallin…
End-anchored macromolecules admixed to a homogeneous monodisperse planar brush and differing from the majority brush-forming chains only by molecular mass take three different types of conformation, depending on its polymerization index, K, relative to that of the majority chains, N . The fraction of the admixed macro…
Introduction Fundamentals of Periodic Processes General Overview of SBR Applications Design of Activated Sludge SBR Plants Equipment and Instrumentation Practical Experiences Evaluation of SBR Facilities in Australia Evaluation of SBR Facilities in the USA and Canada Evaluation of SBR Facilities in Germany Evaluation…
Poly(D,L-lactide)–poly(ϵ-caprolactone)–poly(ethylene glycol)–poly(ϵ-caprolactone)–poly(D,L-lactide) block copolymer (PLA–PCL–PEG–PCL–PLA) was prepared by copolymerization of ϵ-caprolactone (ϵ-CL) and D,L-lactide (D,L-LA) initiated by potassium poly(ethylene glycol)ate in THF at 25°C. The copolymers with different comp…
Abstract Fe III mimochrome I is the prototype of a new class of hemoprotein models characterized by a covalent helix–heme–helix sandwich. It contains deuterohemin bound through two propionyl groups to two identical N ‐ and C ‐terminal protected α‐helical nonapeptides, each of which bears a His residue (a potential axi…
An algorithm is described for reconstructing a symmetric three-dimensional image from its Fourier intensity that is sampled below the Nyquist rate. The study is motivated by an image reconstruction problem in macromolecular x-ray crystallography. Application of the algorithm to simulated crystallographic problems show…
Ab initio calculations (DMOL method) including the estimate of the total energy and the full optimization of the geometrical parameters have been used to study the electronic structures and the coordination geometries of the model systems [{P(CH(2)CH(2)PH(2))(3)}M(H)(L)](+) (M = Fe, L = H(2), C(2)H(4), CO, N(2); M = R…
D-glucosamine-containing glycopolymers with well-controlled structure were synthesized by living cationic polymerization. To this end, D-glucosamine-containing vinyl ether (VE) of the type [CH2()CH(OCH2CH2OR)] was prepared, where R denotes a 3,4,6-tri-O-acetyl-2-deoxy-2-phthalimide-β-D-glucopyranoside, i.e., the hydr…
Maltose metabolism in Lactococcus lactis involves the conversion of beta-glucose 1-phosphate to glucose 6-phosphate, a reaction which is reversibly catalysed by a maltose-inducible and glucose-repressible beta-phosphoglucomutase (beta-PGM). The gene encoding beta-PGM (pgmB) was cloned from a genomic library of L. lact…
The recession rates for 10 ‐6 ‐m‐thick C interfaces in chemical vapor infiltrated SiC reinforced with Nicalon fibers were calculated from thermogravimetric data, assuming all of the mass losses were due to C oxidation, and found to be consistent with the measured recession distances of the C interface, which were surp…
Motion of a screw dislocation in a crystal lattice occurs by kink pair formation in a two-dimensional Peierls potential. Employing the line-tension model of a dislocation, the saddle-point configuration of a nonplanar kink pair in three-dimensional space and the associated activation energy are calculated. The method…
White mica from the Liassic black shales and slates in Central Switzerland was analysed by transmission electron microscopy (TEM) and electron microprobe to determine its textural and compositional evolution during very low‐grade prograde metamorphism. Samples were studied from the diagenetic zone, anchizone and epizo…
Abstract One of the remaining challenges in application of heterogeneous photocatalysis for treatment of air streams containing dilute VOCs is to design a cost‐effective photocatalytic reactor that simultaneously allows efficient contact of the contaminated air and solid catalyst while uniformly irradiating the solid…
The hydrogenation of acetylene−ethylene mixtures over a Pd/α-Al 2 O 3 catalyst was studied. Kinetic investigations were carried out in a flow system equipped with a gradientless microreactor over a wide range of acetylene and ethylene partial pressures. Three types of active sites were thus identified: A 1 and A 2 sit…
Glass optical fibers are almost always coated with a polymer immediately after drawing to protect them from subsequent handling damage. When studying the strength and fatigue properties of the fibers, it is useful to be able to remove this coating in order to directly observe the fatigue properties of the glass in imm…
Abstract Full sets of experimentally determined “collisional energy transfer probability distributions”, P(E', E) , have become available first time for the deactivation of highly vibrationally excited large molecules. These data from KCSI measurements (kinetically controlled selective ionization) on the vibrational r…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of Triarmed-Star Polyphosphazenes via the "Living" Cationic Polymerization of Phosphoranimines at Ambient Temperatures†James M. Nelson and Harry R. AllcockView Author Information Department of Chemistry, The Pennsylvania S…
Oxidation of C1-C4 primary alcohols in thermotolerant Bacillus methanolicus strains is catalyzed by an NAD-dependent methanol dehydrogenase (MDH), composed of ten identical 43,000-Mr subunits. Each MDH subunit contains a tightly, but non-covalently, bound NAD(H) molecule, in addition to 1 Zn2+ and 1-2 Mg2+ ions. The N…
Computer-generated patterned hydrophobic films are produced on hydrophilic glass substrates by a microcontact “stamp” printing technique. The hydrophobic pattern is produced when the silicone elastomeric stamp (“inked” with C18H37SiCl3) contacts the hydrophilic surface. Thin films of polypyrrole and polyaniline are de…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTStabilization of U5+ in Rb4U4P4Se26. An Actinide Compound with a Mixed Selenophosphate/Polyselenide Framework and Ion-Exchange PropertiesKonstantinos Chondroudis and Mercouri G. KanatzidisView Author Information Department of Chemistry, Michigan State University East L…