Materials Literature
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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,…
The evolution of the frequency dependence of the viscoelastic properties during the gel formation of polyurethane has been monitored as a function of time. Over the frequency range investigated, the frequency dependence of the shear moduli G‘ and G‘‘ are well described by the power laws G‘ ∼ ω Δ ‘ and G‘‘ ∼ ω Δ ‘‘, fo…
Using micromachining and electroplating techniques, micromachined thick CoNiMnP-based permanent magnet arrays have been designed, fabricated, and characterized for magnetic microelectromechanical systems (MEMS) device applications. The electroplated magnet arrays contain 1,500 magnets of 40 /spl mu/m/spl times/40 /spl…
The synthesis and characterization of four dinuclear V(IV) complexes are described: 1, [LVO(μ-(Ph) 2 PO 2 )LVO]; 2, [LVO(μ-(Ph)HPO 2 ) 2 LVO]; 3, [LVO(μ-OH) 2 LVO]; and 4, [LVO(μ-OH)(μ-OAc)LVO] (where L = hydrotris(pyrazolyl)borate). X-ray crystal structural analysis of 1 − 4 gave the following parameters: 1, C 46 H 4…
The effect of alloying nitrogen was investigated on crevice corrosion of the 10%Mn-25%Ni-25%Cr-(0∼0.36)%N austenitic steels. From the immersion test results for the multiple crevice specimens in natural seawater, the probability of the occurrence of the crevice corrosion was not dependent upon the nitrogen content, wh…
The roots of Cynanchum caudatum M. (Asclepiadaceae) affored 21 new pregnane glycosides which had sibirigenin, cynanchogenin, gagaminin, 12-O-nicotinoyllineolon and rostratamine as the aglycone moiety and 2, 6-dideoxy-3-O-methylhexopyranoses as component sugars. The structures of these compounds were elucidated by spec…
This paper reviews the different ideas on both the structure of solvent systems and the dissolution of cellulose that have been published in recent years. Especially, it focuses on ligand exchange in solvated LiCl ion pairs which leads to solvation of the hydroxyl groups of cellulose
In the integrators applied in A-to-D converters, smart sensors and other processing circuits, the accuracy is directly limited by the performance of the integrating element: the capacitor. An important nonideality of the capacitors concerns the short-term effects of dielectric absorption. This paper presents an accura…