Now showing items 71-80 of 108
Sol to gel reaction in the K2O---Al2O3---SiO2 system
(Elsevier, 1994-07-02)
A sol to gel transition reaction of three metal alkoxides with water in the preparation of gel in the K2O---Al2O3---SiO2 system was investigated using in situ viscosity measurements and the Raman scattering technique. The ...
Prodynorphin-derived peptide expression in primate cortex and striatum
(Elsevier, 1994-11)
The distributions of four prodynorphin-derived peptides, dynorphin A (1-17), dynorphin A (1-8), dynorphin B, and [alpha]-neo-endorphin were determined in 10 cortical regions and the striatum of the old world monkey (Macaca ...
Anion-selective membrane electrodes based on metalloporphyrins: The influence of lipophilic anionic and cationic sites on potentiometric selectivity
(Elsevier, 1994-06)
The role of lipophilic anionic and cationic additives on the potentiometric anion selectivities of polymer membrane electrodes prepared with various metalloporphyrins as anion selective ionophores is examined. The presence ...
Carbon-hydrogen bond activation over tungsten carbide catalysts
(Elsevier, 1994-08-30)
Tungsten carbides with surface areas ranging from 4 to 39 m2/g were prepared by the temperature-programmed carburization of tungsten oxide and nitride powders with pure CH4 or a 48.9% CH4 in H2 mixture. Oxygen uptakes on ...
Reactions of polycyclic alkylaromatics--VI. Detailed chemical kinetic modeling
(Elsevier, 1994)
We developed a detailed chemical kinetics model for the pyrolysis of long-chain polycyclic n-alkylarenes based on a general free-radical mechanism. The model accounts for the two major primary pathways in the pyrolysis ...
Elastic step interactions on vicinal surfaces of fcc metals
(Elsevier, 1994-09-20)
The structural and energetic properties of [100] and [110] steps on the (001) surface of fcc metal have been determined by T = 0 atomistic simulations. The interactions between [100] steps and between [110] steps on the ...
Polycrystalline surface properties from spherical crystallites: Ag, Au, Cu and Pt
(Elsevier, 1994-04-10)
We have performed a series of atomistic simulations of nearly spherical, crystalline (fcc) clusters of Ag, Au, Cu and Pt as a function of temperature and cluster size. Since both a spherical cluster and a random polycrystal ...
Stabilization of high-affinity opioid agonist binding in neural cell membranes rigidified by cholesterol
(Elsevier, 1994-02-21)
Incorporation of cholesteryl hemisuccinate (CHS) into membranes from SH-SY5Y human neural cells increased membrane microviscosity at both surface and core. In the rigidified membranes, [mu]-selective opioid agonists bound ...
Reduced 5-lipoxygenase metabolism of arachidonic acid in macrophages rrom 1,25-dihydroxyvitamin D3-deficient rats
(Elsevier, 1994-11)
The peripheral blood monocyte (PBM) migrates into tissues and differentiates into mature tissue macrophages. Previous investigations from our laboratory have demonstrated that PBM have reduced 5-lipoxygenase (5-LO) metabolism ...
Measuring hydrogen by cold-neutron prompt-gamma activation analysis
(Kluwer Academic Publishers; Akadémiai Kiadó ; Springer Science+Business Media, 1994-05)
By irradiating with cold neutrons and avoiding hydrogenous materials of construction, we have developed a PGAA instrument at the Cold Neutron Research Facility at NIST with hydrogen detection limits in the microgram range ...