Materials Literature
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We demonstrate an ultracompact optical filter based on two coupled high-index contrast GaAs photonic crystal (PhC) membranes. The PhC membranes consist of a square lattice of air holes and behave as a Fabry-Perot cavity whose reflectivity and transmissivity depend on the air gap between the two membranes. The normal-i…
Organic-inorganic hybrid materials attract particular interest because of their excellent mechanical properties. Here, we report the synthesis of hybrid cryogels consisting of interpenetrated polyisobutylene and silica networks. The gels were prepared by cross-linking of butyl rubber in cyclohexane containing silica n…
Electrochemical studies on the Fc + e(-) <==> Fc(+) (Fc = ferrocene) process have been undertaken via the oxidation of Fc and reduction of Fc(+) as the hexafluorophosphate (PF(6)(-)) or tetrafluoroborate (BF(4)(-)) salts and their mixtures in three ionic liquids (ILs) (1-butyl-1-methylpyrrolidinium bis[(trifluoromethy…
The chemistry of unusual coordination numbers of transition-metal complexes has been of interest because of their presence in biology and catalytic systems. Herein we describe a systematic and predictable approach toward isolation of stable eight-coordinate (8C) iron(III/II) systems. The 8C (S = 2; high-spin, HS) comp…
Self-assembled monolayer films of octadecyltrichlorosilane were prepared on silicon substrates using hexadecane, toluene, chloroform, and dichloromethane to determine the effects of solvent on molecular packing and tribological properties. Topographical atomic force microscopy images were used to evaluate the film qua…
BACKGROUND: Genes in bacteria may be organised into operons, leading to strict co-expression of the genes that participate in the same operon. However, comparisons between different bacterial genomes have shown that much of the operon structure is dynamic on an evolutionary time scale. This indicates that there are op…
Isolated molybdenum centers bearing either one (oxomolybdenum system) or two (dioxomolybdenum system) terminal oxo ligands are considered, which are modeled by appropriate mononuclear oxomolybdenum methoxides and oxomolybdasilsesquioxanes. Although the oxidation process in both systems is characterized by the same fun…
The indentation-derived elastic modulus, E, of bovine compact bone was obtained by nanoindentation. The indentation modulus of the dry condition (i.e. under atmospheric conditions) is 40% higher than when measured wet (i.e. immersed in buffer solution). Although this difference is independent of orientation, there is…
An eight-membered ring: The methane adsorption properties of a new microporous organic zeolite have been studied by volumetric adsorption analysis and high-resolution powder XRD. Methane molecules have been located inside the host channels and a ring of eight methane and eight calixarene molecules is formed through CH…
The prion protein (PrP) is implicitly involved in the pathogenesis of transmissible spongiform encephalopathies (TSEs). The conversion of normal cellular PrP (PrP(C)), a protein that is predominantly alpha-helical, to a beta-sheet-rich isoform (PrP(Sc)), which has a propensity to aggregate, is the key molecular event…
BACKGROUND AND PURPOSE: Accurate assessment of the number and lesion characteristics of brain metastasis is very important in GKS. The purpose of this study was to compare the diagnostic efficacy of DD gadobutrol in the detection of brain metastases compared with a DD 0.5-mol/L gadolinium contrast, gadopentetate dimeg…
Recent experimental data demonstrate that small, soluble amyloid-beta42 oligomers play an important role in Alzheimer's disease because they exhibit neurotoxic properties and also act as seed for fibril growth. We performed all-atom molecular dynamics simulations in explicit solvent of 0.7 micros in total on five Abet…
Four multiring heterocyclic ligands with benzimidazole (L 1 and L 3 ) and benzothiazole nuclei (L 2 and L 4 ) are reported. Their silver(I) complexes involving a variety of anions (both organic and inorganic) have been prepared by the process of self-assembly and structurally characterized by single-crystal X-ray diff…
Insulin fibrillation provides a model for a broad class of amyloidogenic diseases. Conformational distortion of the native monomer leads to aggregation-coupled misfolding. Whereas beta-cells are protected from proteotoxicity by hexamer assembly, fibrillation limits the storage and use of insulin at elevated temperatur…
OBJECTIVE: During osteoarthritis (OA), the altered metabolism of cartilage involves proinflammatory factors and matrix metalloprotease (MMP) activity. Studies showed that chondroitin sulfate (CS) may exert a positive effect on the cartilage. Because of differences in CS in terms of purity and the production/purificati…
A new class of peptide has been created, polypeptide-b-designed peptides, which unites the useful qualities of the two constituent peptide types. We demonstrate the synthesis and self-assembly possibilities of this class of peptide chimera with a series of amphiphilic polypeptide-b-designed peptides in which the hydro…
Abstract Electrospinning, a simple and versatile method to fabricate nanofibrous supports, has attracted continuous attention in the field of enzyme immobilization. In this study, acetylcholinesterase (AChE) has been successfully immobilized in PVA nanofibers via electrospinning of a mixture of AChE, BSA as an enzyme…
The origin of the gap in ${\text{NiS}}_{2}$ as well as the pressure- and doping-induced metal-insulator transition in the ${\text{NiS}}_{2\ensuremath{-}x}{\text{Se}}_{x}$ solid solutions are investigated both theoretically using the first-principles band structures combined with the dynamical mean-field approximation…
Thermosensitive and pegylated polyion complex (PIC) micelles were formed by coassembly of oppositely and permanently charged poly(sodium 2-acrylamido-2-methylpropanesulfonate)- block -poly( N -isopropylacrylamide), PAMPS- b -PNIPAAM, and poly[(3-acrylamidopropyl)-trimethylammonium chloride]- block -poly(ethylene oxide…
The bioavailability limitations of proteins make them difficult to be directly delivered, particularly in diseases caused by insufficient amounts or inactive variants of those proteins. Nanoreactors represent a new promising approach to overcome these limitations because they serve both to protect the protein in their…