Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTMechanical Properties of Cross-Linked Hyaluronic Acid/Poly-(l-lysine) Multilayer FilmsDominique Collin, Philippe Lavalle, Juan Méndez Garza, Jean-Claude Voegel, Pierre Schaaf, and Philippe MartinotyView Author Information Laboratoire de Dynamique des Fluides Complexes (CNRS/ULP…
As good as gold: The activation and selective oxygenation of inert CH bonds, as in methane, is a demanding problem. It is now shown that the combination of gold as a catalyst and H2SeO4 as the oxidant results in a 94 % selectivity for CH3OSO3H at 28 % CH4 conversion (see scheme). These results mean that gold now clai…
Tuberculosis made a resurgence in the mid-1980s and now kills approximately 3 million people a year. The re-emergence of tuberculosis as a public health threat, the high susceptibility of HIV-infected persons and the proliferation of multi-drug-resistant strains have created a need to develop new drugs. Shikimate kina…
A model constructed to treat tensile deformation of semicrystalline polymers introduced in a first paper is again applied to measurements on poly(ethylene- co -12% vinyl acetate) and is now used for an extraction of true elastic moduli and a discussion of the creep behavior. Elastic moduli vary in a characteristic man…
Atomic models are commonly used to calculate phases in macromolecular crystallography. When combined with measured amplitudes, model-based phases yield electron-density maps with features of the correct structure but with a significant bias towards features of the model. The present contribution shows applications of…
The most conventional manufacturing route for ceramic foams with open cells consists of coating reticulated polyurethane foams. The resulting material has well defined cell size, but suffers from low mechanical strength owing to the presence of hollow struts. As a result, the performance and utilisation of ceramic foa…
Lanthanides are attractive as biolabels because their long luminescence decay rates allow time-gated detection, which separates background scattering and fluorescence from the lanthanide emission. A stable and highly luminescent terbium complex based on a tetraisophthalamide (TIAM) chelate is paired with a polyaromati…
A short review of the author's computer-graphics developments since 1976 is presented. Some of the major developments in these programs are reviewed and a description is provided of some of the more recent tools that can be used for electron-density map interpretation. These tools include a secondary-structure templat…
Single and multijunction nanowires with diameters of 10-40 nm were synthesized by an electrically assisted sonochemical method in aqueous solution at room temperature. By properly controlling the reaction conditions and reactants, this method opens a new strategy towards the fabrication of one-dimensional superlattice…
Incorporation of imidazolium ion functionalities into the paraffinic side-chain termini of a triphenylene derivative resulted in stabilization of a columnar mesophase of its liquid crystalline assembly, which was retained over a wider temperature range down to 4 degrees C by an externally added imidazolium-based ionic…
The new CCP4 Coordinate Library is a development aiming to provide a common layer of coordinate-related functionality to the existing applications in the CCP4 suite, as well as a variety of tools that can simplify the design of new applications where they relate to atomic coordinates. The Library comprises a wide spec…
Reaction of di-2-pyridyl ketone (dpk) with nickel acetate and azide in the presence of potassium tert-butylate as a catalytic base generates the title compound, which contains the largest [Ni(mu(1,1)-N3)]6 circles in the discrete ferromagnetically-coupled M(II)-azide cluster family, and shows an unprecedented in situ…
Uniform hexagonal Cu2S nanowires with 2-6 nm diameters, 0.1 to several mum in length, were made by precipitation and thermolysis at 155 degrees C for 120 min from a Cu-thiolate colloid with a viscosity of 93.5 mPa/s. The morphologies of the final nanoproducts are governable through control of the coordination chemistr…
This communication presents quantum mechanical calculations of interresidue potential constants for the Watson-Crick base pairs adenine-thymine (AT) and guanine-cytosine (GC), permitting a unique quantification of hydrogen bond strengths. Due to the calculated compliance constants, large differences between individual…
We report the synthesis of a new class of materials called periodic mesoporous dendrisilicas. They are prepared from dendrimers with trialkoxysilyl groups at the outmost shell. Dendrimers of various cores and numbers of shells are used. The dendrisilica synthesis is based on acid- or base-catalyzed hydrolysis of the t…
A microprobe of protons with an energy of 17 million electron volts is used to quantitatively image three-dimensional hydrogen distributions at a lateral resolution better than 1 micrometer with high sensitivity. Hydrogen images of a <110>-textured undoped polycrystalline diamond film show that most of the hydrogen is…
The design of a new versatile control system that will underlie future releases of the automated model-building package ARP/wARP is presented. A sophisticated expert system is under development that will transform ARP/wARP from a very useful model-building aid to a truly automated package capable of delivering complet…
beta-Zn4Sb3 is an outstanding thermoelectric material mainly due to its extraordinarily low thermal conductivity, which is similar to that of glasses. Recently it was proposed that interstitial Zn atoms are responsible for this peculiar behavior. Here we report on the crystal and electronic stucture of the low-tempera…
Large area microdomain alignment in a ferroelectric liquid crystalline diblock copolymer (LCBCP) poly(styrene)- block -poly(isoprene-LC), (PS−PILC), incorporating a biphenyl 3-nitro-4-alkoxy-benzoate LC mesogenic group and a non-LC block hexagonally packed cylinder microstructure, was successfully accomplished by appl…
Characteristic cylindrical microphase-separated structures have been found for three ABC star-shaped terpolymers. The samples are composed of polystyrene (S), polyisoprene (I), and poly(2-vinylpyridine) (P); their volume ratios of I:S:P are about 1:1:0.7, 1:1:1.2, and 1:1:1.9, respectively, three components being conn…