Materials Literature
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Two genes YER081W and YIL074C, renamed SER3 and SER33, respectively, which encode phosphoglycerate dehydrogenases in Saccharomyces cerevisiae were identified. These dehydrogenases catalyze the first reaction of serine and glycine biosynthesis from the glycolytic metabolite 3-phosphoglycerate. Unlike either single muta…
Abstract Nucleophilic aromatic substitution reaction of 4‐aminophenol and also 5‐amino‐1‐naphthol with 2,6‐dichloropyridine in N‐methyl‐2‐pyrrolidone (NMP) as solvent, in the presence of potassium carbonate, afforded two aromatic ether diamines. Eight soluble, thermally stable polyamides were prepared by polycondensat…
Bragg reflections of cholesteric liquid crystals at normal and oblique incidences were investigated using the finite element method (FEM). Detailed FEM derivations together with the consideration of boundary conditions are given. Two methods for achieving broadband Bragg reflection are analysed: one is to use high bir…
Accelerator-based measurements and model calculations have been used to study the heavy-ion radiation transport properties of materials in use on the International Space Station (ISS). Samples of the ISS aluminum outer hull were augmented with various configurations of internal wall material and polyethylene. The mate…
Abstract Polyethylene terephthalate (PET) was mixed by extrusion with clay (montmorillonite) to produce nanocomposites. Additives (pentaerythrytol and maleic anhydride) were added to induce compatibility between the particles and the matrix. Thermal, mechanical and Theological properties of the nanocomposites were eva…
As a material family, pi-conjugated polymers (also known as intrinsically conductive polymers) elicit the possibility of both exploiting the chemical and physical attributes of the polymer for membrane-based separations and incorporating its electronic and electrochemical properties to enhance the separation figures-o…
A poly(9,10-anthryleneethynylene)-based polyradical with two pendant stable phenoxyls in one anthracene skeleton was newly synthesized via polymerization of the corresponding bromoethynylanthracene monomer using a Pd(0) catalyst. The average molecular weight of the polymer reached M(n) = 5 x 10(3) and was soluble in c…
Abstract A new biomimetic approach for performing CaCO 3 synthesis exclusively inside micron‐sized polyelectrolyte capsules, based on the fermentative formation of a precipitative agent (CO 3 2− anion) by urease‐catalyzed urea hydrolysis, was developed. Precipitated CaCO 3 completely fills the interior capsule volume…
Abstract 1‐Naphthol reacts with 1,1‐diarylprop‐2‐yn‐1‐ols 5a , b , under alumina catalysis, by two pathways to give the photochromic naphtho[1,2‐ b ]pyrans 6a , b , together with the propenylidenenaphthalenones 7a , b , representatives of a new class of merocyanine dyes. With 2‐methyl‐1‐naphthol, formation of the phot…
Pulsed electric current sintering (PECS) has been used to densify α‐Si 3 N 4 powder doped with oxide additives of Y 2 O 3 and Al 2 O 3 . A full density (>99%) was achieved with virtually no transformation to β‐phase, resulting in a microstructure with fine equiaxed grains. With further holding at the sintering temp…
Fullerene-like (FL) carbon nitride (CNx) films were deposited on Si (100) substrates by dc reactive, unbalanced, magnetron sputtering in a N2/Ar mixture from a high-purity pyrolythic graphite cathode in a dual-magnetron system with coupled magnetic fields. The N2 fraction in the discharge gas (0%–100%) and substrate b…
The visual observations of batch and continuous foaming processes were conducted to understand the bubble nucleation and bubble growth behaviors in polymers. The batch foaming was performed using a newly developed high-pressure cell, where two sapphire windows were equipped on the walls so as to observe the early stag…
We describe the morphological, electrochemical, spectroelectrochemical characterization, and electrochromic device properties of films of poly(2,2‘-[10-methyl-3,7-phenothiazylene]-6,6‘-bis[4-phenylquinoline]) (PPTZPQ). Cyclic voltammograms of PPTZPQ polymer films showed reversible electrochemical oxidation accompanied…
The atomic resolution structure of Leishmania mexicana triosephosphate isomerase complexed with 2-phosphoglycolate shows that this transition state analogue is bound in two conformations. Also for the side chain of the catalytic glutamate, Glu(167), two conformations are observed. In both conformations, a very short h…
The phase equilibrium and thermoelectric properties of Co1−xNixSb3 ternary system were examined up to high nickel content x=0.40. NiSb compound with nickel arsenide structure was observed as the impurity phase in the samples with x>0.10 by x-ray diffraction. The sign of the Seebeck coefficient of Co1−xNixSb3 is…
Highly grain-aligned Ca3Co4O9 and (Ca2.7Sr0.2La0.1)(Co3.9Cu0.1)O9 ceramics were prepared by the magnetic alignment technique, and then treated by a spark plasma sintering process to increase their bulk densities. Thermoelectric properties were investigated from room temperature to 700 °C in air. Grain alignment is eff…
Although chlorites are an important source of Mg and micronutrients in soils, little is known about their weathering behavior in acidic environments. The effect of organic (acetic, oxalic, citric) and inorganic (hydrochloric, nitric, sulfuric) acids on the dissolution of ripidolite was studied at 25°C over an acid con…
A set of five-parameter descriptors, sum MV(ter)(R(ter)), L(F), DeltaX(SB), sum PEI, and Q(+/-), are developed to express the chain stiffness (or mobility) and the intermolecular forces of polymers. Investigated results show a good correlation (R = 0.9517, R(2) = 0.9056, s = 20.86 K) between the glass transition tempe…
The structure-polymerizability relationship has been investigated in a series of polyimide (PI) precursor, poly(amic acid) systems obtained from trans-1,4-cyclohexanediamine (CHDA) and various dianhydrides. The results have shown that the systems examined in this work can be classified into three groups on the basis o…
Abstract An in‐situ microfiber‐reinforced composite (MRC) based on polyethylene (terephthalate) (PET) and polyethylene (PE) was prepared by slit die extrusion followed by hot stretching. Test specimens were prepared by injection molding at the processing temperature of the PE matrix. At this temperature, far below the…