Materials Literature
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Hydroxylation of proline residues in the Yaa position of the Gly-Xaa-Yaa repeated sequence to 4(R)-hydroxyproline is essential for the formation of the collagen triple helix. A small number of 3(S)-hydroxyproline residues are present in most collagens in the Xaa position. Neither the structural nor a biological role i…
New polymers having high solid-state fluorescence quantum yields and the ability to tune their electron affinity without effecting their band gap using hyperconjugative interactions is reported. The novel three-dimensional poly(phenylene vinylenes) having [2.2.2] bicyclic ring systems shown were synthesized, and the d…
We study different regimes in the dynamics of swelling of a long polymer chain from a compact globule. Depending on the age or degree of self-entanglement inside of the globule, we consider the limiting cases of “freshly formed” globule and “old” globule. Considering the density of polymer in a globule, which influenc…
Femtosecond laser pulse induced structural changes in silica glass and their role in changing the refractive index of the glass have been investigated using ab initio molecular dynamics simulation methods based on finite-temperature density functional theory. The average nearest-neighbor Si-O, Si-Si, and O-O distances…
[structure: see text] The multistep synthesis of a calixarene joined to a second calixarene via a long spacer is described. Since each calixarene bears multiple galactose-based units (known to bind strongly to rat hepatoma cells), there existed the possibility of cross-linking the cancer cells into a network. The comp…
The present contribution describes an unsophisticated yet highly efficient process to make dicarboxyl telechelic isotactic polypropylene containing pendant nitro groups via the oxidative degradation of commercially available crystalline polypropylene with nitric acid. The obtained crystalline polymer has a narrow mole…
Hydrolysis of native (amorphous) polyhydroxybutyrate (nPHB) granules isolated from different sources by soluble PHB depolymerase of Rhodospirillum rubrum in vitro requires the presence of a heat-stable compound (activator). The activator was purified and was resistant against various physical and chemical stresses suc…
We investigated the structures formed when blends of poly(styrene- b -ferrocenyl silane) (PS- b -FS) and poly(styrene- b -2-vinyl pyridine) (PS- b -P 2 VP) were spread at the air/water interface. The results demonstrated that new structures were formed which were distinct from those formed when either of the copolymer…
We report on the design, fabrication, and initial characterization of vertically aligned carbon nanofiber-based microfabricated field emission devices with an integrated out-of-plane electrostatic focusing electrode. The potential placed on this electrode was found to have a profound impact on the diameter of the beam…
A series of 4,1-polyisoprene- b -1,2-polybutadiene diblock copolymers of differing molecular weights and compositions were prepared by anionic polymerization. The polybutadiene blocks were selectively hydrogenated to poly(ethylethylene) using a homogeneous ruthenium catalyst. The double bonds in the polyisoprene block…
The protein TA0175 has a large number of sequence homologues, most of which are annotated as unknown and a few as belonging to the haloacid dehalogenase superfamily, but has no known biological function. Using a combination of amino acid sequence analysis, three-dimensional crystal structure information, and kinetic a…
Globally, the leather industry is currently undergoing radical transformation due to pollution and discharge legislations. Thus, the leather industry is pressurized to look for cleaner options for processing the raw hides and skins. Conventional methods of pre-tanning, tanning and post-tanning processes are known to c…
We study the effect of dissimilar interfaces on the phase behavior of cylinder forming block copolymers in thin films by means of dynamic density-functional theory. In this article, we show that dissimilarity of the interfaces induces hybrid structures. These structures appear when the surface fields at the two interf…
Azobenzene polymer thin films exhibit reversible surface mass transport when irradiated with a light intensity and/or polarization gradient, although the exact mechanism remains unknown. In order to address the role of thermal effects in the surface relief grating formation process peculiar to azo polymers, a cellular…
Since carbon nanotubes and onions were discovered, many methods have been proposed for their production. For applications the main requirements are low capital cost, high purity of the produced material, simplicity of technique, and its potential for scale up. Recently a cathodic arc between two graphitic electrodes i…
We focus on Vicsek fractals (VF), which are regular hyperbranched macromolecules. As such, they belong to the same family as the dendrimers, without suffering from the growth problems of the latter. We compute the mechanical and dielectric properties of VF in dilute solutions. The evaluation of the static and dynamica…
Silicalite-1 films (thickness = 400 nm) supported on both sides of glass plates (SL/G) were prepared, and hemicyanine dyes (HC-n) with different alkyl chain lengths (n, n = 3, 6, 9, 12, 15, 18, 22, and 24) were included into the silicalite-1 films by dipping SL/Gs into each methanol solution of HC-n (1 mM) for 1 d. Th…
Radio frequency sputtering has been used to deposit α-alumina (α-Al2O3) thin films at substrate temperatures of 280–560 °C. The films are shown to be single phased and hard. Nanoindentation gives values of 306±31 and 27±3 GPa for elastic modulus and hardness, respectively, for a substrate temperature of 280 °C. Growth…
By using a H 2 -assisted thermal evaporation approach, ZnS nanobelts were grown on a Si substrate and self-assembled into a network structure. A vapor-solid process coupled with vapor−liquid−solid process is proposed for the formation of the ZnS nanobelts and their assembly. This functional structure may be well appli…
We present first-principles (local-density approximation) LDA+U calculations of electronic structure and magnetic state for ${\mathrm{LaCoO}}_{3}$ and ${\mathrm{HoCoO}}_{3}.$ Low-spin to intermediate-spin state transition was found in our calculations using experimental crystallographic data for both materials with a…