Materials Literature
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We elucidate the role played by defective icosahedra on the stability of undercooled copper by using molecular-dynamics simulations. Our approach is substantiated by the level of agreement with experiments on a variety of structural properties. We show that not only perfect but also defective icosahedra, embedded in a…
We calculate the surface phase diagram of a two-dimensional hard-rod fluid confined between two hard lines. In the first stage we study a semi-infinite system consisting of an isotropic fluid in contact with a single hard line. We have found complete wetting by the columnar phase at the wall-isotropic fluid interface.…
The absorption and diffusion of organic solvents such as toluene, diesel and kerosene into natural rubber vulcanizates filled with palm kernel husk and N330 was studied at ambient temperature, using the immersion/weight gain method. The results showed no further weight change after 24 h The absorption and the diffusio…
The mechanical properties, such as Young's modulus, yield strength, and the elongation at breakage, were investigated for several sulfur-containing biopolymers P(3HB-co-3MP). A series of P(3HB-co-3MP) samples with 3MP unit content ranging from 6.6 to 39.1 mol-% was biosynthesized by fermentation using the PHA-synthesi…
Extended tapes of cyclic water hexamers are formed in a one-dimensional copper(II) complex bridged by oxalate with a rare mono, bidentate coordination mode. The water tapes are stabilized by the hydrogen bond interactions between uncoordinated oxalate oxygen atoms and water molecules. Magnetic analysis reveals weak fe…
Ribonuclease (RNase) HI from the psychrotrophic bacterium Shewanella oneidensis MR-1 was overproduced in Escherichia coli, purified, and structurally and biochemically characterized. The amino acid sequence of MR-1 RNase HI is 67% identical to that of E. coli RNase HI. The crystal structure of MR-1 RNase HI determined…
We studied the nanoscale structure of the short-range incommensurate magnetic order in ${\text{La}}_{1.5}{\text{Sr}}_{0.5}{\text{CoO}}_{4}$ by elastic neutron scattering. We find that magnetic diffuse scattering is isotropic in the $a\text{\ensuremath{-}}b$ plane, in contrast with the naive expectation based on the po…
Mature amyloid fibrils are believed to be formed by the lateral association of discrete structural units designated as protofibrils, but this lateral association of protofibrils has never been directly observed. We have recently characterized a thioesterase from Alcaligenes faecalis, which was shown to exist as homome…
Beta-cyclodextrin and its permethylated derivatives form 2:1 inclusion complexes with tetrakis- and octakis(4-carboxyphenoxy)phthalocyanines 1-4, reducing their aggregation tendency and promoting their sensitization of singlet oxygen formation in aqueous media.
The rotational molecular dynamics of water confined to layered oxide materials with brucite structure was studied by dielectric spectroscopy in the frequency range from 10(-2) to 10(7) Hz and in a broad temperature interval. The layered double hydroxide samples show one relaxation process, which was assigned to fluctu…
It is natural to associate the tachocline with the region of generation of a strong toroidal field by the winding-up of a weaker poloidal component. Here I discuss the break-up and subsequent escape of such a field via magnetic buoyancy instabilities. I consider the different modelling approaches that have been employ…
The fracture of achiral carbon nanotubes (CNTs) with one atomic vacancy is studied. Nonuniform variation of the fracture strain is observed from molecular mechanics simulations, and an elastic shell model is developed to describe the research findings. Hardening and softening domains near the edges of the tubes are sp…
This paper reports on an attempt to use reactive extrusion with peroxide as a comfortable pathway for improvement of the crystallization of poly(3-hydroxybutyrate) in a melt spinning process. At first, rheological and thermal properties of the modified melts are determined in order to assess the effect of nucleation.…
Abstract The precise understanding of diagenetic pathways occurring during fossilization of biomineralized skeletons is of critical importance for various related fields in both paleontology and sedimentology. In particular, this may have fundamental implications in paleoenvironmental studies for interpreting geochemi…
Abstract A process design for a two‐stage procedure for the production of PHB from natural gas based on the results, obtained on a laboratory and small technical scale, was developed. For this purpose, four bioreactors were dimensioned and interconnected so as to achieve a quasi‐continuous PHB production. A price of 6…
Abstract For some photochromic compounds (58 diarylethenes and 9 fulgimides), the results of our spectral and kinetic studies are presented. Aiming at targeted synthesis of new photochromic compounds, the structure – photochromic behavior relationship (SPBR) for the synthesized compounds has been analyzed. The perspec…
Formamide, in its pure state, has been used as a working solvent for layer-by-layer (LbL) polyelectrolyte self-assembly. Polystyrene sulfonate (PSS) and polyallylamine hydrochloride (PAH) polyelectrolyte films were deposited onto planar substrates and colloidal particles. Film deposition was confirmed using quartz cry…
Amino acid substitutions at two residues downstream from the active-site histidine of polyhydroxyalkanoate (PHA) synthases are effective for changing the composition and the molecular weight of PHA. In this study, saturation mutagenesis at the position Ala505 was applied to PHA synthase (PhaCAc) from Aeromonas caviae…
Abstract Poly(methyl methacrylate) (PMMA) films containing photochromic spiropyran (SP) derivatives with an alkyl chain produced surface relief structures upon photoirradiation. The material moved from the dark to the irradiated part by the light longer than 350 nm from a high‐pressure mercury lamp. This is the first…
In this preliminary work we have prepared a fluorinated polymer capable of solubilizing an appreciable amount of O(2) and, at the same time, maintaining a higher water solubility than perfluoroalkanes investigated as injectable O(2) carriers. In particular, we describe the synthesis and characterization of a new macro…