Materials Literature
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The three-dimensional structures of human and rabbit liver cytosolic recombinant serine hydroxymethyltransferases (hcSHMT and rcSHMT) revealed that E75 and Y83 (numbering according to hcSHMT) are probable candidates for proton abstraction and Calpha-Cbeta bond cleavage in the reaction catalyzed by serine hydroxymethyl…
This paper describes the isolation, identification and analgesic activity of a new biflavonoid from Rheedia gardneriana leaves, which correspond to I3-naringenin-II8-4'-OMe-eriodictyol (GB-2a-II-4'-OMe) (1), with a methoxyl group in position 4 of ring-II. Its structure was determined by spectroscopic data and confirme…
The role of Fe oxides on the availability and dynamics of phosphorus (P) is poorly understood in calcareous soils. We ascertained its role in laboratory and plant growth experiments on substrates prepared by mixing calcium carbonate (calcite) sand (CCS, 0.2-0.5 mm) and Fe oxide (ferrihydrite)-coated quartz sand (FOCS,…
Transmission electron microscopy (TEM) and thermal (DTA-TG) analyses of lazurite, (Na,Ca) 8 [Al 6 Si 6 O 24 ](SO 4 ,S) 2 , indicate three forms: cubic, modulated, and orthorhombic. Cubic lazurite contains mainly [Na 3 Ca·SO 4 ] 3+ clusters that are disordered together with the O1 and O2 oxygen atoms, and no satellite…
We report a phenomenon occurring in field-responsive suspensions: shear-induced anomalous stresses. Competition between a rotating field and a shear flow originates a multiplicity of anomalous stress behaviors in suspensions of bound dimers constituted by induced dipoles. The great variety of stress regimes includes n…
In a search for sharp features in the electronic density of states (DOS) of quasicrystals, a systematic comparative study of the DOS in the vicinity of Fermi energy ${E}_{F}$ was performed in icosahedral ${\mathrm{Al}}_{72.4}{\mathrm{Pd}}_{20.5}{\mathrm{Mn}}_{7.1},$ ${\mathrm{Al}}_{62}{\mathrm{Cu}}_{25.5}{\mathrm{Fe}}…
In Ni 2+ x Mn 1− x Ga shape-memory ferromagnetic alloys with coincident magnetic and structural phase transitions, a reversible structural field-induced phase transition was observed at constant temperature and pressure in magnetic fields of about 10 T. Computational results are in qualitative agreement with experimen…
We prepared five mutant lysozymes in which glycines whose dihedral angles are located in the region of the left-handed helix, Gly49, Gly67, Gly71, Gly102 and Gly117, were mutated to an alanine residue. From analyses of their thermal stabilities using differential scanning calorimetry, most of them were more destabiliz…
A new Monte Carlo simulation method designed for polymer solutions confined to planar slits is presented. The slit is in equilibrium with a surrounding bulk solution and the method allows a variation of the slit width while maintaining the polymer chemical potential constant. This is achieved by changing the tangentia…
The frequency dependent viscoelastic properties and lamellar spacing of three symmetric styrene−isoprene (PS−PI) diblock copolymers are compared to those of their hetero-four-arm star counterparts. The PS and PI arm molecular weights of the three linear and three star samples are 10, 20, and 60 kg/mol, respectively. A…
The phase behavior of model colloidal systems containing platelets and polymer is investigated using computer simulation and perturbation theory. For polymer coils with a diameter sigma(P) larger than 0.3sigma(D), where sigma(D) is the diameter of the platelets, isotropic fluid-fluid coexistence is observed, in additi…
It is pointed out theoretically that the ordered morphology in the binary mixtures of A−B type diblock copolymers, ((A−B) 1 /(A−B) 2 ), depends not only on the compositions of block copolymers (i.e., the volume fraction of the A block, f A1, f A2 ) but also on the relative chain-length differences of the constituent c…
Diffraction profiles were analysed from thermally deposited 111-oriented gold films, ranging in thickness from 300 to 1900 Å. The data were collected using the high-resolution powder diffractometer on beamline BM16 at the European Synchrotron Research Facility (ESRF) set at a wavelength of 0.3507 Å. The profiles were…
A comprehensive study of morphological and topographical changes in low tempera ture plasma treated flax fibers is reported. Time-series images of fiber surface appearance are examined by environmental scanning electron microscopy (ESEM). As the exposure time increases, the depth of the micropores etched by the plasma…
Porphyrin aggregation is a field of wide interest owing to the possible technological and biomedical applications. Under these premises, the possibility of tuning and driving the assembly processes turns out to have a central role in achieving specific structures and, therefore, functions. Recently, we have demonstrat…
Vanadium oxide nanotubes (VOx-NTs) are easily accessible in pure form from vanadium(V) alkoxides and amines by a sol-gel reaction and a subsequent hydrothermal treatment. The wall structure of VOx-NTs containing hexadecylamine or dodecylamine as the structure-directing template has been characterised by transmission e…
Regioselective synthesis using protecting-group strategy yields azulene-cellulose conjugates 6-(azulene-2-carboxylate)-2,3-di-O-methyl cellulose AzC-1, 6-(4-azulene-1-yl-benzoate)-2,3-di-O-methyl cellulose AzC-2, and 6-(azulene-1-carboxylate)-2,3-di-O-methyl cellulose AzC-3. The spectral and electrochemical properties…
The generation of magic number silica clusters [(SiO 2 ) n O 2 H 3 ] - with n = 4 and 8 by XeCl laser (308 nm) ablation of porous siliceous materials is reported. The production of magic cluster [(SiO 2 ) 4 O 2 H 3 ] - can be enhanced by sample selection and experimental optimization so that it becomes the most promin…
Abstract The microstrocture of poly(butylene terephthalate) (PBT) has been investigated at the different stages of the manufacture of a new generation of composite materials, i.e., commingled Twintex® PBT/glass fiber composites. From differential scanning calorimetry and wide angle X‐ray scattering analysis in additio…
Abstract In this work, the electrical and morphological properties of blends of poly(ethylene terephthalate) (PET), poly(methyl methacrylate) (PMMA), and carbon black (CB) were analyzed. Resistivity decreases similarly in both PET and PMMA with CB concentration. Similarly in the PET/PMMA blend, extensive modification…