Materials Literature
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Thermodynamic equilibria were calculated to determine optimum fabrication conditions for SiC-whisker-reinforced Si{sub 3}N{sub 4} composite ceramics. Results of calculations indicate that pressureless sintering in a nitrogen atmosphere of 0.1 MPa may be performed at temperatures up to 2,123 K (1,850{degree}C) without…
Preserved diatom assemblages are found in deep water sediments in Lake Washington above and below an ash layer originating from an eruption of Mt. Mazama 6800 b . p . Total abundance of frustules did not change after the ash event, but a significant shift in community structure occurred. Melosira italica var. subarcti…
For pt.1 see ibid., vol.33, no.11, p.1239-48 (1988). Sonoluminescence, produced when a therapeutic ultrasound generator operating at 1 MHz was used to insonate a tank of water, was detected using a photomultiplier tube and analysed using pulse height analysis. Spectra of the number of counter per second were obtained…
info:eu-repo/semantics/published
Abstract The Bureau of Mines, in its ongoing effort to combat the wear of mining and mineral processing equipment, has used several types of laboratory wear tests. Investigations into existing pin abrasive wear testing machines resulted in the construction of the Bureau's own pin-on-drum wear testing apparatus, incorp…
Thick lamellar single crystals and large bulk single crystals are found to grow in films of vinylidene fluoride and trifluoroethylene copolymers when they are annealed at temperatures between the Curie point and melting point. The morphologies of these crystals are studied using SEM, TEM, and X-ray diffraction. The la…
Phosphorylation of pure fructose-6-phosphate,2-kinase:fructose-2,6-bisphosphatase from bovine heart by cAMP-dependent protein kinase and protein kinase C was investigated. The major enzyme form (subunit Mr of 58,000) was rapidly phosphorylated by both cAMP-dependent protein kinase and protein kinase C, incorporating 0…
Surface-enhanced Raman spectra of pyridine on copper and gold electrodes in the near-infrared were obtained with a Fourier transform Raman spectrometer. Surface-enhanced Raman spectra were observed for pyridine adsorbed on copper and gold electrodes while a Nd:YAG laser (1.064/μm) was used for excitation. Good-quality…
Evidence is presented that demonstrates that phosphatidylserine synthase (CDPdiacylglycerol:L-serine O-phosphatidyltransferase, EC 2.7.8.8) from Saccharomyces cerevisiae is phosphorylated in vivo and in vitro by cAMP-dependent protein kinase. Phosphatidylserine synthase activity in cell extracts was reduced in the bcy…
The hypernetted-chain (HNC) and Percus–Yevick (PY) approximations are solved numerically for isotropic fluids of hard spherocylinders with length-to-breadth ratios ranging from 2 to 6. The theoretical results are compared with the available Monte Carlo data for the equation of state and the pair correlation function.…
The photoaffinity ligand [3H]PK 14105 was utilized to modify covalently peripheral-type benzodiazepine binding sites in rat adrenal mitochondrial preparations. The photolabeled membrane preparations were then solubilized in 1% digitonin and the detergent-soluble extracts subjected to fractionation by ion-exchange chro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle electron transfer and nucleophilic substitution. Reaction of alkyl bromides with aromatic anion radicals and low-oxidation-state iron porphyrinsDoris. Lexa, Jean Michel. Saveant, . Su Khac Binh, and Dan Li. WangCite this: J. Am. Chem. Soc. 1988, 110, 23, 7617–7625Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, crystal structure, magnetic properties, and thermodynamic and electrochemical studies of the binuclear complex [(.mu.-oxalato)bis[(1,4,8,11-tetraazacyclotetradecane)nickel(II)] nitrateLuigi P. Battaglia, Antonio Bianchi, Anna Bonamartini Corradi, Enrique Garcia-Es…
Forty-nine amino acid substitutions were made at four positions in the Escherichia coli enzyme beta-galactosidase; three of the four targeted amino acids are thought to be part of the active site. Many of the substitutions were made by converting the appropriate codon in lacZ to an amber codon, and using one of 12 sup…
The static structure factor S(k) and pair distribution function g(r) of liquid germanium at 1000 degrees C were measured using neutron diffraction. A wider k-range was covered that in previous diffraction experiments on liquid Ge and particular attention was given to the data analysis procedure used to extra S(k) from…
Toughening of whisker‐reinforced (or fiber‐reinforced) ceramics by whisker pullout requires debonding at the whisker/matrix interface. Compressive clamping stresses, which would inhibit interface debonding and/or pullout, are expected in composites where the matrix has a higher thermal expansion coefficient than the w…
The enzyme that catalyzes the ADP-ribosylation and concomitant inactivation of dinitrogenase reductase in Rhodospirillum rubrum has been purified greater than 19,000-fold to near homogeneity. We propose dinitrogenase reductase ADP-ribosyltransferase (DRAT) as the working name for the enzyme. DRAT activity is stabilize…
Lightguides were fabricated from three commercial polyimides of which one contains one and the others contain two hexafluoroisopropylidene (6F) groups. The latter are isomers using either the para or the meta isomer of the same diamine. As the number of 6F groups increases the optical losses of the corresponding light…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnergetics of acetylene-addition mechanism of diamond growthD. Huang, M. Frenklach, and M. MaroncelliCite this: J. Phys. Chem. 1988, 92, 22, 6379–6381Publication Date (Print):November 1, 1988Publication History Published online1 May 2002Published inissue 1 November 1988https…
Abstract Several substituted Fe‐ and Co‐containing tetraphenylporphins 1 were loaded on carbon either by adsorption from acetone or by in situ synthesis on the carbon support. The porphin/carbon combinations were pyrolyzed at 800°C. The electrocatalytic activities in the reduction of dioxygen were investigated in alka…