Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of fluoride ions on the absorption and luminescence properties of the [Eu.cntnd.2.2.1]3+ and [Tb.cntnd.2.2.1]3+ cryptatesN. Sabbatini, S. Perathoner, G. Lattanzi, S. Dellonte, and V. BalzaniCite this: J. Phys. Chem. 1987, 91, 24, 6136–6139Publication Date (Print):N…
Abstract Tetraphenylporphinesulfonate (TPPS 4 ) is a synthetic porphyrin that localizes in certain tumors to a higher absolute concentration and with more favorable tumor to other tissue ratios than any other porphyrin yet studied. Its utilization for photodynamic therapy and other applications has been inhibited by r…
Abstract This second paper of a series continues the examination of the tensile properties of two series of linear low density polyethylene/polypropylene, (LLDPE/PP) blends. The blends were prepared using a twin‐screw extruder and cover the whole concentration range, An Instron Universal Tensile Tester was used to mea…
A kinetic mechanism is presented for Escherichia coli dihydrofolate reductase which describes the full time course of the enzymatic reaction over a wide range of substrate and enzyme concentrations at pH 7.2 and 20 degrees C. Specific rate constants were estimated by computer simulation of the full time course of sing…
We report structural studies of incommensurate and random GaAs-AlAs superlattices using Raman scattering by acoustic phonons. Properties of the structure factor of Fibonacci and Thue-Morse superlattices are discussed in some detail.
Abstract There is considerable economic incentive to convert methane into formaldehyde, which is used in the manufacture of insulating materials and adhesives. This paper discusses the kinetics of a one‐step oxidation of methane with molecular oxygen over a MoO 3 ‐SiO 2 catalyst. The space velocity was varied between…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of new polymers containing porphyrins in their side chains: radical polymerizations of 5-[4-(acryloyloxy)phenyl]-10,15,20-triphenylporphyrin and 5-[4-(methacryloyloxy)phenyl]-10,15,20-triphenylporphyrinMikiharu Kamachi, Xian Su Cheng, Tomikazu Kida, Atushi Kajiwara…
Vimentin is a growth-regulated gene whose mRNA levels increase severalfold after stimulation of quiescent cells. We have isolated and sequenced a genomic fragment of human DNA containing the vimentin 5'-flanking sequence and untranslated region. S1 nuclease analysis was used to determine the transcription initiation s…
The details of photoluminescence and excitation spectra of powder phosphors were obtained at various temperatures between 6 and 300 K. At 300 K, two emission bands originating from the , transitions are observed at 480 and 535 nm for and at 470 and 527 nm for , respectively. In the excitation spectra, bands correspond…
Abstract It has been reported that the addition of specific copolymers can improve the mechanical properties of blends of polyethylene with polyamide‐6. One of these, a poly(ethylene‐co‐methacrylic acid) (EMA) containing between 4 and 15 mol % of methacrylic acid units, has often been used. Binary polyethylene/EMA and…
Electrodeposited tungsten oxide films from aqueous tungstic acid-hydrogen peroxide solutions were investigated for applications to electrochromic devices. These films exhibited electrochromism in aprotic electrolyte solutions containing Li-salts. When the films were heat-treated for an hour at temperatures between 100…
A cDNA clone, named ppcMDH-1 and covering a part of the coding region for the porcine cytosolic malate dehydrogenase (cMDH) mRNA, was isolated from a porcine liver cDNA library. Subsequently, mouse cMDH cDNA clones were isolated from mouse liver and heart cDNA libraries, using the ppcMDH-1 cDNA as a probe. The longest…
Recent developments in understanding structural and material properties of ferroelectric liquid crystals are reviewed with emphasis on their relevance for electro-optic effects and device applications. In only a few years the material situation has changed from one characterized by an almost complete lack of technical…
The amino acid sequence of the 212-residues-long N-terminal aggregation and cross-linking region of the alpha 2(IV) chain of human basement membrane collagen is presented. Comparing this with the primary structure of alpha 1(IV)7S [Glanville et al. (1985) Eur. J. Biochem. 152, 213-219] revealed a high degree of simila…
Low-frequency noise spectra originating from resistance fluctuations in Al films during electromigration were measured in the absolute temperature and current density intervals327 \leq T \leq 396K and1.34 \times 10^{6} \leq j \leq 2.22 \times 10^{6}A/cm2. The values of SR, the resistance power spectral density, at 20…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStabilization of nickel(III) in a classical N2S2 coordination environment containing anionic sulfurH. J. Krueger and R. H. HolmCite this: Inorg. Chem. 1987, 26, 22, 3645–3647Publication Date (Print):November 1, 1987Publication History Published online1 May 2002Published inis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariational basis-set calculations of accurate quantum mechanical reaction probabilitiesDavid W. Schwenke, Kenneth. Haug, Donald G. Truhlar, Yan. Sun, John Z. H. Zhang, and Donald J. KouriCite this: J. Phys. Chem. 1987, 91, 24, 6080–6082Publication Date (Print):November 1, 1…
Drosophila laminin was isolated from the medium of Drosophila Kc cell cultures. It was purified by velocity sedimentation, gel filtration, and chromatography. Drosophila laminin is a disulfide-linked molecule consisting of three chains with apparent molecular masses of 400, 215, and 185 kD. In electron micrographs, it…
The electroclinic effect in the smectic A phase of 4-(3-methyl-2-chlorobutanoyloxy)-4'-heptyloxybiphenyl has been investigated. Values up to 10° are obtained for the induced tilt angle, which is proportional to the applied d.c. field. The amplitude of the tilt angle modulation shows exactly the same dependence on temp…
Diffuse scattering from TiNi alloys of near equi-atomic composition is investigated by electron diffraction, and several high-resolution images produced by diffuse scattering together with some Bragg reflections are presented. Three characteristic features of diffuse scattering are as follows. (1) The maxima of the di…