Materials Literature
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Diffraction peak profiles broaden due to the smallness of crystallites and the presence of lattice defects. Strain broadening of powders of polycrystalline materials is often anisotropic in terms of the hkl indices. This kind of strain anisotropy has been shown to be well interpreted assuming dislocations as one of th…
Syntheses and biodegradation of random copolymers of L-lactide (L-LA) with trimethylene carbonate (TMC), 1,1-dimethyltrimethylene carbonate (1,1-DTMC) and 2,2-dimethyltrimethylene carbonate (2,2-DTMC) were investigated at various monomer ratios using SmMe(C5Me5)2THF as an initiator at 80 °C for 24 h in toluene. Enzyma…
The structure of the cubic‐ZrO 2 symmetrical tilt Σ5 (310)/[001] grain boundary is examined using density functional theory within the local density and pseudopotential approximations. Several pristine stoichiometric grain‐boundary structures are investigated and compared with Z‐contrast scanning transmission electron…
Two pipeline steels of different grades were used to study the effect of cyclic loading prior to corrosion exposure upon the initiation of stress corrosion cracks in a near-neutral-pH soil environment. A cyclic loading scheme was constructed based on pressure fluctuation data collected on operating pipeline systems. T…
Abstract Regional differences in clay mineralogy are found in British Lower Palaeozoic slate belts formed during Caledonian terrane amalgamation. Extensional basins in Wales, the northern Lake District and the Isle of Man are characterized by a greater diversity of species in clay mineral assemblages. Slates that evol…
Abstract Composites based on isotactic polypropylene (PP) and sisal fiber (SF) were prepared by melt mixing and injection molding. The melt mixing characteristics, thermal properties, morphology, crystalline structure, and mechanical behavior of the PP/SF composites were systematically investigated. The results show t…
Abstract An attempt is made to reconcile observations and theories of cross-slip with recent models of cyclic plasticity and the fatigue endurance limit of crystals. According to this view, the stress required to separate two screw dislocations of opposite signs, which are just on the point of mutual annihilation by c…
Dihydrofolate reductase (DHFR) catalyzes the nicotinamide adenine dinucleotide phosphate (NADPH)-dependent reduction of 7,8-dihydrofolate (H2F) to 5,6,7,8-tetrahydrofolate (H4F). Because of the absence of any ionizable group in the vicinity of N5 of dihydrofolate it has been proposed that N5 could be protonated direct…
Describes research designed to examine the effects of subject positioning on the accuracy of body scan data. A body measurement system developed by the Textile Clothing Technology Corporation was used to acquire two scans from each of 72 subjects. The subjects were instructed to continue to breathe normally and stand…
A new achiral banana-shaped five-ring 2-methylresorcinol derivative fluorinated on the outer rings has been synthesized. This compound exhibits four antiferroelectric smectic phases characteristic for bent-core molecules (B2, B′2, B″2, B5). In addition, a highly viscous solid-like phase has been detected which also sh…
Syntheses of two series of new styryl dyes incorporating thiacrown ether moieties (CSDs 3a − e, 4a − e ) are described. 1 H NMR and UV−vis measurements show that these compounds exhibit a strong preference for formation of complexes with heavy metal ions. Polarographic measurements allow conversion of relative complex…
Measures to counteract proteolysis during sample preparation are widely used; among them, protein extraction at a basic pH (Tris pH 11.0), sample boiling in sodium dodecyl sulfate (SDS), extraction in denaturing lysis solutions and the use of proteinase inhibitors combined with some of these approaches. Here, we teste…
[structure: see text] A novel TTF-based donor with a uracil moiety, TTF-(1-n-butyluracil-5-yl) (TnbU), was synthesized. Crystal structures of both TnbU and the charge-transfer complex of TnbU-hydrogen cyananilate possess complementary double hydrogen bonds through uracil moieties and pi-stacking dimer structures betwe…
The formation of glycerol-3-phosphate (G3P) in cells growing on TB causes catabolite repression, as shown by the reduction in malT expression. For this repression to occur, the general proteins of the phosphoenolpyruvate-dependent phosphotransferase system (PTS), in particular EIIA(Glc), as well as the adenylate cycla…
Abstract The method for prediction of Gibbs free energies of formation, based on the parameter Δ G O= M z + (clay) characterizing the oxygen affinity of the cation M z + , on the smectites, considered as hydrated clay minerals, has been used for micas and brittle micas, and yielded underestimated values. This method o…
Summary The soils and sediments of the uplands in the Manaus region are described and analysed along a representative cross‐section. There are two broad types of features, lateritic and redoximorphic. Their formation is linked to two main processes acting under contrasted hydrological regimes. The first process, actin…
The main purposes of wastewater treatment systems are to remove organic pollutants, but it would be very attractive if there were a way to recover the organic pollutants as valuable organic materials. One of the possible ways to recover organic pollutants in wastewater is to convert them into polyhydroxyalkanoates (PH…
A series of formulations with varying enzyme and chelator components is tested for flax fiber yield and properties using a recently developed enzyme retting system on Ariane flax grown as a winter crop in southeastern South Carolina. The levels of Viscozyme L, a commercial pectinase-rich enzyme mixture, and Mayoquest…
A stable colloidal form of novel π-conjugated polydithiafulvene (PDF)-protected PbS nanoparticles was first prepared in a nonaqueous solution at room temperature. The results of X-ray diffraction (XRD) and transmission electron microscopy (TEM) images demonstrated that the synthesized PbS nanoparticles of stable collo…
Well-aligned carbon nanotubes (CNTs) were grown on mesoporous silica films by chemical vapor deposition (CVD). Ethylene was used as the carbon source and CVD was performed at 1023 K and atmospheric pressure. The films were doped with Fe during sol−gel synthesis, and three different structure directing agents were used…