Materials Literature
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The PHAs with different pendant units such as methyl, vinyl, epoxide and hydroxyl groups at the terminus were prepared by biosynthesis or chemical modifications following the biosynthesis. The thermal decomposition behavior of these PHAs have been studied by thermogravimetric analysis (TGA), differential thermal analy…
Brazilian textile mills import wastewater treatment technologies, performances of which are generally evaluated only on a physicochemical basis. Thus, a battery of bioassays was used to evaluate the performance of an ozonation system to treat textile effluents. Comparative toxicological profiles for bacteria (Vibrio f…
Experimental observations on steam generator tubes with a cold-worked surface layer (in as-received condition) and in the electropolished state (surface layer removed by electropolishing) showed a great influence of surface condition on stress corrosion cracking (SCC) initiation. The purpose of this work was to quanti…
The interrelation of physicochemical properties with biological interactions at the interface to understand blood compatibility of materials in contact with blood has been discussed. The bioethics for human experimentation and future research outlook has been projected.
The temperature dependences of Grüneisen parameters for layered crystals of the hexagonal crystal system are constructed. It is demonstrated that the Grüneisen parameters calculated in the framework of the model proposed by I.M. Lifshits for a strongly anisotropic crystal agree satisfactorily with those obtained from…
A new cyclic peptide 1 having an (LLLD)3 configuration pattern was designed that is capable of forming artificial transmembrane ion channels by self-assembly of planar peptide rings, with hydrophilic groups arrayed in the interior of the channel. Ion permeability in the presence of the synthetic peptide 1, cyclo[-Trp-…
Abstract Clay minerals in shales from cores at Site 808, Nankai Trough, have been studied using X-ray diffraction (XRD), scanning transmission electron microscopy (STEM), and analytical electron microscopy (AEM) to compare the rates and mechanisms of illitization with those of coeval bentonites, which were described p…
The structures of M 2 O 3 –TeO 2 (M = Al and Ga) glasses have been investigated by means of 125 Te, 27 Al, and 71 Ga NMR spectroscopies. The structural units of respective cations in M 2 O 3 –TeO 2 glasses were quantitatively analyzed. The fractions of TeO 4 trigonal bipyramid, AlO 6 and GaO 6 octahedra decreased and…
The synthesis of lanthanide(III) alkoxides has been described as a series of reactions for which the control of product purity is difficult. The possibility of using amide complexes, in the presence of alcohol, to produce alkoxides was investigated in homogeneous and heterogeneous media. The polymerization of ε-caprol…
Recent crystallographic evidence of nonplanarity of several prosthetic groups in heme proteins has prompted the design of conformationally distorted synthetic porphyrins in order to assess the consequences of the nonplanarity observed in vivo. The crystal structure of the sterically crowded Fe(III) 2,3,7,8,12,13,17,18…
X-ray crystal structures of three forms of human mitochondrial branched-chain aminotransferase (BCAT) were solved by molecular-replacement methods, using Escherichia coli BCAT as the search model. The enzyme is a homodimer and the polypeptide chain of each monomer has two domains. The small domain is composed of resid…
Space charge dynamics in low-density polyethylene (LDPE) films were observed by the pulsed electroacoustic (PEA) method during breakdown tests at various temperatures. In order to investigate the intrinsic electrical breakdown, the applied electric field was increased to 300 kV/mm in 150 ms, and kept constant until br…
Motivated in part by recent experiments on liquid crystals with bent-core molecules, which are observed to display a spontaneous chiral symmetry breaking, we introduce a field theory of a 3rd-rank tensor order parameter T^{ijk} to describe the isotropic-to-tetrahedratic phase transition that we predict to take place i…
The pore sizes of hydrogen-methyl-siloxane-based porous spin-on-glass (SOG) thin films having different k values ( k =1.8–2.5) are comparatively studied using different nondestructive instrumental ways and also with reference to sorption porosimetry. The pore size and its spread are found to increase with increasing p…
Abstract Tetraaryl-substituted cerium(IV) double-decker porphyrin (2D), tetraaryl-substituted lanthanum(III) double-decker porphyrin (3D), and diaryl-substituted lanthanum(III) triple-decker porphyrins (4T•Me and 4T•MeO) were newly synthesized and their porphyrin ring rotation rates were systematically estimated by me…
The solvent behaviour of flash-cooled protein crystals was studied in the range 100--180 K by X-ray diffraction. If the solvent is within large channels it crystallizes at 155 K, as identified by a sharp change in the increase of unit-cell volume upon temperature increase. In contrast, if a similar amount of solvent i…
Thick films of poly(benzylsilsesquioxane) (BnSiO 3/2 ) particles, prepared by the sol–gel process, were deposited onto indium‐tin‐oxide‐coated glass substrates by electrophoresis for the application to the micropatterning of the films. BnSiO 3/2 particles were thermally softened and sintered at ∼50°C, which was above…
High sp3 fraction tetrahedral amorphous carbon (ta-C) films can be prepared using the filtered cathodic vacuum arc (FCVA). A by-product of the deposition process are small micrometer sized graphitic particles which are also incorporated into the film. The particle coverage of FCVA films is typically <5%, and th…
A detailed analysis is given of the conditions for the generation of misfit-induced defects (misfit wedge disclinations and disclination dipoles, periodical arrays of misfit wedge disclinations, and misfit-dislocation walls (MDWs)) in a two-phase cylindrical composite misfitting system. It is shown that the nucleation…
The spectroscopic properties of P2O5–Y2O3–Er2O3 and P2O5–Li2O–Al2O3–Y2O3–Er2O3 ultraphosphate glasses have been investigated. The concentration quenching rates of Er3+ in these two systems are lower compared with those in other oxide glasses. The spectral broadening of the measured fluorescence of 83.33P2O5–(16.67−x)E…