Materials Literature
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Penicillin G acylase from Bacillus megaterium (BmPGA) is currently used in the pharmaceutical industry as an alternative to PGA from Escherichia coli (EcPGA) for the hydrolysis of penicillin G to produce 6-aminopenicillanic acid (6-APA), a penam nucleus for semisynthetic penicillins. Despite the significant difference…
Perovskite-type oxides La 0.9 M 0.1 CoO 3 ( M = K / Na / Li ) were prepared by a citrate sol–gel method. These oxides were characterized by x-ray diffraction analysis (XRD), a scanning electron microscope (SEM) and the N 2 physisorption Brunauer–Emmitt–Teller (BET) method. Their catalytic activity was studied by a con…
Each year, hundreds of thousands of patients undergo coronary artery bypass surgery in the United States.1 Approximately one third of these patients do not have suitable autologous donor vessels due to disease progression or previous harvest. The aim of vascular tissue engineering is to develop a suitable alternative…
Assuming constant rates for nucleation and growth and neglecting thermal gradient in the melt, an analytical approach to describe the undercooled solidification was proposed in terms of ξ α ( x) function. This approach was adopted to study the solidification of undercooled Ni–B alloy. With increasing melt undercooling…
Abstract Due to the energy transfer from surface plasmons, the fluorescence of fluorophores near metallic nanostructures can be enhanced. This effect has been intensively studied recently for biosensor applications. This work reports on the luminescence enhancement of 100 nm Cy3 dye-doped polystyrene nanoparticles by…
A comparative light transmission and scanning electron microscopy study of the kinetics of pore structure formation for membranes based on polysulfone (PS), polycaproamide (PCA), and polyvinylidene fluoride (PVDF) from solutions in DMAA has been performed. It has been shown that the structure formation rate is determi…
New ternary dodecalithium dodecacopper tetradecaaluminium, Li(12)Cu(12.60)Al(14.37) (trigonal, R ̅3m, hR39), crystallizes as a new structure type and belongs to the structural family that derives from binary Laves phases. The Li atoms are enclosed in 15- and 16-vertex and the Al3 atom in 14-vertex pseudo-Frank-Kasper…
The effects of Y 2 O 3 on BaTiO 3 –MgO–MnO 2 –CaZrO 3 nonreducible ceramics were investigated. Specimens with Y 2 O 3 contents ranging from 1.0 to 2.5 mol % were prepared via the solid state method. The Curie temperature ( T c ) and the electrical properties were closely related to the occupation behavior of yttrium,…
Abstract The inclusion of a washcoat model into monolithic catalyst simulations in order to create a one + one‐dimensional framework using a minimum number of parameters is reviewed. All assumptions and numerical methods are presented while ensuring the prevention of excessive temperature excursions. Parametric studie…
Duplex and superduplex stainless steels have high strength and high corrosion resistance with a crescent demand in chemical and petrochemical industries. The best mechanical properties of this family of steels are obtained with approximately equal parts of ferrite and austenite. Grain refinement increases the toughnes…
Two new orientation relationships between β-Mg 2 Sn precipitates and α-Mg matrix have been observed by transmission electron microscopy. One is (1 1 0) β //(0 0 0 1) α , [0 0 1] β //[1 −1 0 0] α , and the other is (1 1 0) β //(0 0 0 1) α , [−1 1 −1] β //[1 −1 0 0] α . The precipitates with both orientation relationshi…
The development of low temperature applications for ferritic nodular cast irons calls for improved materials in the as cast state, e.g. for off-shore windmills components. Within this line of work, a series of 68 castings were prepared with the same casting procedure and slight changes in composition. The tensile prop…
Deoxyuridine triphosphatase (dUTPase) is a ubiquitous enzyme that has been widely studied owing to its function and evolutionary significance. The gene coding for the dUTPase from the Chlorella alga was codon-optimized and synthesized. The synthetic gene was expressed in Escherichia coli and recombinant core Chlorella…
Eine neu aufkommende Methode: Die Ionothermalsynthese ist ein neuer, vielversprechender Ansatz, bei dem eine ionische Flüssigkeit als Lösungsmittel, strukturdirigierendes Agens und ladungskompensierende Spezies dient. Die Methode ermöglicht die Entwicklung unkomplizierter Strategien zur Synthese von polyoxometallatbas…
Whilst technological advancements have allowed imaging at atomic resolution using scanning transmission electron microscopy (STEM), identification of nanocluster structures has proven difficult due to their low thermal stability, and often resultant low-symmetry. In this work, we look at a novel solution to this probl…
Abstract Wood plastic composites have been prepared based on simul wood ( Bombax ceiba L.), which was vacuum impregnated with the styrene acrylonitrile (SAN) co-polymer nanoclay (nnc) intercalating system in the presence of glycidyl methacrylate (GMA), a crosslinking agent. The impact of nanoclay was investigated on t…
Electron beam lithography (EBL) has become a popular means to prepare a wide variety of nano-arrays for numerous studies and applications, including photonics and sensors. Their fabrications and characterizations are costly and time consuming, underscoring the importance of developing effective tools to rapidly study…
An isocitrate dehydrogenase from Zymomonas mobilis was overexpressed in Escherichia coli as a fused protein (ZmIDH). The molecular mass of recombinant ZmIDH, together with its 6× His partner, was estimated to be 74 kDa by gel filtration chromatography, suggesting a homodimeric structure. The purified recombinant ZmIDH…
Magnetic refrigeration at around ambient temperatures has become of considerable technical and commercial interest over the last few years. It depends upon the magnetocaloric effect, and suitable working materials are those that undergo a phase transition which can be driven by a modest magnetic field. We focus here o…
Semiconducting carbon nanotubes (CNTs) possess outstanding electrical and optical properties because of their special one-dimensional (1D) structure. CNTs are direct bandgap materials, which makes them ideal for use in optoelectronic devices, e.g. light emitters and light detectors. Excitons determine their light abso…