Materials Literature
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Complete and highly redundant data sets were collected at nine different wavelengths between 0.80 and 2.65 A on a xenon derivative of porcine pancreatic elastase in both air and helium atmospheres. The magnitude of the anomalous signal, as assessed by the xenon-peak height in the anomalous difference Patterson synthes…
The method of the joint probability distribution functions is applied to derive a probabilistic formula which is able to phase reflections in the MAD case accurately, under the condition that the anomalous-scatterer substructure has been defined previously. The mathematical approach takes into account both measurement…
The distance-dependent interaction between multilayers of alternating polycation (poly- l -lysine) and polyanion (poly- l -glutamic acid) deposited onto mica surfaces in aqueous solution is investigated with the surface force apparatus. At large separations, a long-range, weak attraction is observed. The interaction t…
The photochemical reactivities of cobalt(III)-diamine and cobalt(III)-amino acid compounds have been compared using complexes that also contain polypyridyl ligands. Metallacyclic complexes result from UV-induced photodecarboxylation reactions of the amino acid complexes. UV-irradiation of closely related complexes wit…
In a transmission electron microscope, CuCl particles were irradiated by a convergent electron beam (CEB, 200 kV, 200 pA/cm 2, beam diameter of ca. 1−2 μm) to induce growth of copper nanostructures. Upon CEB irradiation, Cu nanoparticles (5−20 nm in diameter) were formed from commercial CuCl. Using synthesized CuCl en…
Acetohydroxyacid synthase (AHAS; EC 2.2.1.6) catalyses the formation of 2-acetolactate and 2-aceto-2-hydroxybutyrate as the first step in the biosynthesis of the branched-chain amino acids valine, leucine and isoleucine. The enzyme is inhibited by a wide range of substituted sulfonylureas and imidazolinones and many o…
Poly(ethylene glycol) (PEG) with the terminal group of active ester was coupled to the amino group of gelatin to prepare PEG-grafted gelatin (PEG-gelatin). The affinity chromatographic study revealed that the PEG-gelatin with high degrees of PEGylation did not adsorb onto the gelatin affinity column, in remarked contr…
Enantioselective crystal growth of leucine occurs on a solid surface modified with a self-assembled monolayer depending on the chirality of the enantiomer attached, as evidenced by the X-ray diffraction method.
We have prepared and investigated two dendrimers based on a 1,3,5-trisubstituted benzenoid-type core, containing 9 and 21 viologen units in their branches, respectively, and terminated with tetraarylmethane derivatives. We have shown that, in dichloromethane solution, such highly charged cationic species give rise to…
Abstract The ester–amide exchange reaction between poly(ethylene terephthalate) and p ‐phenylenediamine in n ‐dodecylbenzene as a solvent in the absence of catalyst was carried out to obtain heat‐resistant polyamide. The observation of the amide group generated in the reaction product was made by FTIR analysis and the…
Within the Onsager theory we study free planar isotropic-nematic interfaces in binary mixtures of hard rods. For sufficiently different particle shapes the bulk phase diagrams of these mixtures exhibit a triple point, where an isotropic (I) phase coexists with two nematic phases (N1 and N2) of different composition. F…
We report the results of simulations of the phase diagrams of a quasi-two-dimensional (Q2D) colloid assembly and of a two-dimensional (2D) colloid assembly which have the same colloid-colloid interaction. That interaction is the same as used in the study reported by Zangi and Rice [Phys. Rev. E 58, 7529 (1998)]. Among…
Structural characteristics and optical properties of ethyl−cyanoethyl cellulose [(E−CE)C]/acrylic acid (AA) cholesteric liquid crystalline solutions and their variations caused by polymerization AA were investigated by UV−vis spectroscopy and wide-angle X-ray scattering (WAXS). With increasing (E−CE)C concentration, b…
Abstract For Abstract see ChemInform Abstract in Full Text.
Novel branch-like CdS micropatterns were synthesized using thiosemicarbazide (NH 2 NHCSNH 2 ) both as a sulfur source and as a capping ligand in a methanol/water system. The thiosemicarbazide/CdCl 2 ratios were found to effectively play crucial roles in the morphologies of CdS crystals. With the ratios decreasing from…
The transition of crystal growth is revealed in ultrathin poly(ethylene oxide)/poly(methyl methacrylate) (PEO/PMMA) blend films (film thickness D < 3 nm) as the crystallization condition changes from vacuum to humidity. The PEO crystallizes into a fractal-like branched structure in a vacuum from a state mixed with PMM…
Abstract To get more information on the structure of iodinated poly(vinyl alcohol) (PVA), thermal analyses of unoriented and oriented PVA films were conducted. Unoriented and oriented PVA films iodinated with aqueous solutions at selected concentrations were carried out by thermogravimetry (TG) and differential scanni…
Time-resolved infrared spectral measurement was performed in the solvent-induced crystallization process of syndiotactic polystyrene (sPS) glass at the various temperatures, and the crystallization kinetics were analyzed quantitatively. Both of the crystallization rate constant and the crystallinity estimated after pa…
We present experimental results on the crystal–amorphous transition of forsterite (Mg2SiO4) silicate under ion irradiation. The aim of this work is to study the structural evolution of one of the most abundant crystalline silicates observed in space driven by ion irradiation. To this aim, forsterite films have been sy…
A detailed investigation of the nature of the binding of each of the 20 common alpha-amino acids and various selected dipeptides to a chiral, diaqua-ytterbium complex in aqueous solution has been carried out. Analysis of the dipolar 1H NMR paramagnetic shifts suggests that the alpha-amino acids form a common chelated…