Materials Literature
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BACKGROUND: The tissue-engineered (TE) heart valve was developed to improve the durability of tissue heart valves. The aim of this study was to evaluate morphological and histological changes in a TE heart valve consisting of decellularized porcine matrices seeded with viable autologous vascular endothelial cells (AVE…
Iron−sulfur proteins are an important class of electron carriers in a wide variety of biological reactions. Determining the intrinsic contribution of the metal site to the redox potential is crucial in understanding how the protein environment influences the overall redox properties of the Fe−S proteins. Here we combi…
The epitaxial growth of vanadium oxide (V 2 O 3 ) has been investigated by scanning tunneling microscopy (STM), low energy ion back-scattering (ISS) and low energy electron diffraction (LEED). Direct evaporation of vanadium onto metal surfaces (Cu, Au or Cu 3 Au) gives rise to massive surface alloying. The attempt to…
A description is given of some properties of the corona discharge when propagating over a cylindrical polytetrafluoroethylene insulator surface placed along the axis of a rod-plane electrode arrangement. A scanning electrostatic probe has been used to measure the density of charge deposited on the surface; it is shown…
Abstract Polypropylene compounds containing organophilic layered silicates were prepared by means of melt extrusion at 180°C. We have studied the effect of the coupling agent on morphology development and mechanical properties. We are convinced of the importance of both the chemistry and the process conditions to elab…
Abstract The influence of the catalyst/initiator system and polymerization conditions on the microstructure and physical properties of copolymers of equimolar amounts of 1,3‐trimethylene carbonate (TMC) and ε ‐caprolactone (CL) was studied. Statistical copolymers were prepared in the presence of stannous octoate (SnOc…
Abstract Novel discotic liquid crystalline bis[2,3,9,10,16,17,23,24-octakis(3,4-dialkoxyphenoxy)phthalocyaninato]lutetium(III) complexes, {[(CnO)2PhO]8Pc}2Lu (n = 12: 5a and n = 13: 5b), were synthesized. Their mesomorphic properties were investigated using polarization microscopy, DSC, and temperature-dependent X-ray…
Ideal pyroxenes are hypothetical structures based on ideal closest-packed arrangements of O anions. They are modeled after observed pyroxene structures and have the general formula M2M1T2O6, where M2 and M1 represent octahedrally coordinated cations, and T represents tetrahedrally coordinated cations. An algorithm has…
Modulated Scanning Calorimetry shows the non-reversing heat flow near T g to display a sharply defined global minimum in the 0.28 < x < 0.40 range, identified with the self-organized phase (SOP) of titled glasses. 31 P NMR, Raman scattering and constraint counting algorithms suggest this phase to consist of two distin…
Abstract The hydrothermal reaction of V 2 O 5 , H 2 C 2 O 4 ·2H 2 O, KOH, en and NiCl 2 ·6H 2 O yields a new three‐dimensional open‐framework solid. The extended structure consists of a three‐dimensional network of [V 16 O 38 Cl] 8− cages, with each cage connected to six other neighboring units through [Ni(en) 2 ] 2+…
Antimicrobial films may provide an effective way to control food-borne pathogens and spoilage microorganisms to thus enhance food safety and decrease product spoilage. Antimicrobial films can be produced by incorporation of chemical preservatives or antimicrobial agents into a plastic film. The agents can then diffuse…
Abstract Si3N4‐Al2O3‐Y2O3, Si3N4‐TiN and Si3N4‐AIN‐Al2O3‐Y2O3 (β‐sialon) nanopowders with the specific surface area of 60–70 m2/g and average particle size of 30–50 nm have been prepared by plasmachemical synthesis. By means of the hot pressing method at 1850°C compact materials with fine‐grained structure were prepar…
Nanocrystallization of steels by ball milling and by a ball drop test was compared using specimens with different carbon content and starting microstructures. The nanocrystalline structure produced by ball milling and ball drop test has essentially the same characteristics; nano-sized ferrite grains, dissolution of ce…
Abstract This paper addresses the phenomenology of strand interaction in biaxial non‐embedded braided textile structures under uniaxial tension. The specific interest in the development of new braided textile structures is a result of the shortcomings of current rope, belt, and cable performance under large strain con…
Corrosion inhibition studies of mild steel in 1.0 N sulphuric acid have been performed at 25°C using substituted thiobiurets and their molybdenum and tungsten complexes as inhibitors. All the inhibitors have been found toinhibit the corrosion process by getting adsorbed on the metal surface. Among the studied thiobiur…
L-Pyroglutamate (PGA) is naturally occurring from L-glutamate solution with accelerated formation rate under high temperature and low pH. Even though PGA has been identified as a neurotoxic agent on brain cells, the effect of PGA on the growth of microorganisms is rarely known. Here various kinds of microorganisms dif…
Abstract Based on the primary principles of biomineralization, CaCO 3 similar to that in biominerals was synthesized through biomimetic synthesis under the self‐assembly of sodium acrylate. In our experiment, the formation of the calcium carbonate and the polymerization of sodium acrylate took place simultaneously thr…
AbstractThe development of thermal stress during the diffusion bonding of Al2O3 ceramic to aluminium is analysed via the finite element analysis method using a commercial software package, namely, MARC/MENTAL. Before diffusion bonding, a 0.2 mm copper layer is sintered onto the ceramic. The results show that shear str…
Three banana-shaped achiral compounds, derivatives of 4,6-dichloro-1,3-phenylene bis-[4-(4-n-octyloxyphenyliminomethyl) benzoate], were synthesized by varying the substituent (X = H, F and Cl). Their mesomorphic properties were investigated by differential scanning calorimetry, polarizing optical microscopy, and X-ray…
Acylhomoserine lactone (AHL) synthases act as chemical communication signals or pheromones in Gram-negative bacteria and regulate diverse physiological events in a cell density-dependent manner. The recent crystal structure determination of EsaI, a key enzyme in this pathway, shows that the AHL synthase superfamily me…