Materials Literature
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Superelastic Ni-Ti (Nitinol) alloys are becoming integral to the design of a variety of new medical products. The enormous elasticity of these alloys is the most dramatic advantage afforded by this material, but by no means the only or most important. Also discussed in this paper are features such as biocompatibility,…
Spiropyran linked to methyl cellulose (SP–MC) is prepared by the treatment of methyl cellulose with 1′-(2-carboxyethyl)-3′,3′-dimethyl-6-nitrospiro[2H-benzopyran-2,2′-indoline] as a photofunctional material and photoregulation of some of its properties under irradiation with UV light are investigated. The spiropyran m…
Room temperature absorption spectra of low temperature molecular beam epitaxy grown GaAs (LT-GaAs) and AlGaAs (LT-AlGaAs) are reported. We performed measurements in an extended spectral range from 0.8 eV to photon energies of 2.8 eV far above the band gap. For as-grown LT-materials, the absorption coefficients at the…
Dielectric relaxation spectroscopy has been used to investigate the block end-to-end vector relaxation in symmetric poly(styrene- b -1,4-isoprene) diblock copolymers both in the ordered state and in the disordered state close to the disorder-to-order transition (ODT). Evidence is presented of two new types of dielectr…
Stereoselectivity of photocyclodimers of unsaturated carboxylates is shown to be controlled by changing the site distance of clay interlayers.
First-generation monolithic porous ceramic filter materials have experienced thermal fatigue, high-temperature creep, and a loss of material strength when operated for extended periods of time in advanced coal-fired combustion and gasification systems. Fiber-reinforced and advanced ceramic composites potentially provi…
Elastic moduli and glass transition temperatures (Tgs) of two polycyanurates, based on the dicyanates of bisphenol A and an oligomeric poly(arylene ether sulfone), have been predicted from molecular simulation. The simulated mechanical and physical parameters offer reasonable agreement with the experimental values. Th…
To achieve low‐temperature superplasticity in alumina, we have introduced charge‐compensating dopants, Ti 4+ and Mn 2+ , which jointly have a high solubility and significantly enhance the diffusion and deformation processes during sintering and forming. Zirconia as a second‐phase pinning agent has also been incorporat…
N- Succinyl- ll -diaminopimelate aminotransferase (DAP-AT) (EC 2.6.1.17), a key enzyme in the bacterial pathway to l -lysine, was purified to near homogeneity (1500-fold) in five steps from wild type Escherichia coli ATCC 9637. This pyridoxal phosphate (PLP) dependent enzyme has a molecular weight of 39.9 kDa, appears…
Several authors have indicated that ultrasound is effective in oxidizing organic contaminants in water and in wastewater either as the sole means of treatment or in combination with ozonation and UV irradiation. In this work we decomposed 2-chlorophenol (2-cp) in aqueous solution with ultrasound and H 2 O 2 . The expe…
In a continuum approach to concrete fracture a gradient-dependent plasticity theory is used to preserve the well-posedness of the problem in the softening regime and to obtain finitely sized fracture process zones. The theory employs a Rankine failure surface which is dependent on an equivalent fracture strain measure…
Abstract Li 4−2x Sr 2+x B 10 S 19 (x ≈ 0,27) und Na 6 B 10 S 18 wurden aus der Summenformel entsprechenden Mengen Strontiumsulfid und Lithiumsulfid (Natriumsulfid), amorphem Bor und Schwefel bei 700°C in graphitierten Quarzglasampullen dargestellt. Li 4−2x Sr 2+x B 10 S 19 (x ≈ 0,27) kristallisiert monoklin in der Rau…
A macrocycle equipped with convergent and divergent recognition sites binds two cofactors, a quinone and a porphyrin, and thereby accelerates photoinduced electron transfer between them.
To understand the acceleration of the Zircaloy corrosion kinetics in PWR conditions, TEM microstructural characterizations of oxide layers grown in an autoclave or directly in-reactor have been performed. To separate the influence on the oxidation process of the irradiation damage in the alloy from the dynamic effect…
The objective of this study was to investigate the positional effect of hydrophobic interactions in the alpha-helical interface in controlling the formation of two-stranded and four-stranded coiled-coils. Two disulfide-bridged antiparallel coiled-coils were designed which differ only in the position of a single Ala re…
We investigated the possibilities of drug delivery to the brain using thermosensitive liposomes and hyperthermia. Thermosensitive liposomes are small vesicles containing some drugs, which are designed to release the drugs in response to hyperthermia. The first experiment consisted of four groups: (1) received free Cis…
In this study we demonstrate formation of nitric oxide in aqueous nitrogen-containing solutions exposed to 50 kHz cavitation-producing ultrasound (standard bath sonicator) using electron paramagnetic resonance detection of • NO by trapping with the sodium N -methyl- d -glucamine dithiocarbamate iron(II) complex ((MGD)…
The surface chemistry of polyaniline films is controlled via the nucleophilic reaction of amines within the polymer with substituted benzenediazonium ions. The nucleophilic reaction is shown to be diffusion-limited regardless of the substituent on the benzenediazonium ion. Chemical modification results in a layered st…
The solubilities of the protein ovalbumin in aqueous ammonium sulfate solutions ranging from 18 to 30 g ammonium sulfate/100 g water at 30 °C were determined for pH values in the range 4.58−5.4. A correlation of the data is presented which is estimated to predict solubilities within ±5%.
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorMolecular Dynamics Simulations of the Force between a Polymer Brush and an AFM TipMichael Murat and Gary S. GrestView Author Information Soreq Nuclear Research Center, Yavne 81800, Israel,† and Max Planck Institut für Polymerforschung,…