Now showing items 61-70 of 94
Synthesis of polynucleotide analogs by grafting optically active adenine, cytosine, and hypoxanthine derivatives onto polytrimethylenimine
(John Wiley & Sons, Inc., 1989-11)
A new family of polynucleotide analogs were prepared by grafting nucleic acid base derivatives onto polytrimethylenimine. Several new optically pure Α-nucleic acid base substituted propanoic acids were prepared as pendant ...
Synthesis of optically active polynucleotide analogs with poly(vinyl alcohol)s as backbones and adenine and 5-bromouracil derivatives as pendants
(John Wiley & Sons, Inc., 1989-10)
The optically active polynucleotide analogs were prepared by grafting nucleic acid base derivatives onto poly(vinyl alcohol). The ( R )-ethyl 2-(5-bromouracil-1-yl)propanoate was obtained either by reaction of 5-bromouracil ...
Synthesis of optically active polynucleotide analogs with polytrimethylenimine backbones and thymine moieties
(John Wiley & Sons, Inc., 1989-01-15)
Polynucleotide analogs with polytrimethylenimine backbones and optically active 2-(thymin-1-yl)propionic acids as pendants were prepared. Linear polytrimethylenimines were obtained by ring-opening polymerization of ...
Molecules with high rotational angular momentum: a generalized ab initio approach
(Elsevier, 1989-09)
An outline is given of a systematic and automated computational procedure based upon our successful ab initio approach to the theoretical study of centrifugal distortions of rotating molecules and their associated energy ...
Segregation measures for diffusion-controlled A+B reactions
(Elsevier, 1989-11-24)
New measures of segregation are defined and calculated for the A + B-->0 reaction on one-dimensional and fractal lattices (Sierpinski carpet and gasket). We differentiate between local and global segregation parameters. ...
Solid state synthesis and characterization of model hydrodesulfurization catalysts
(Elsevier, 1989-10)
Solid-state reactions of elemental sulfur with metallic cobalt and molybdenum powders were used to synthesize model catalysts for hydrodesulfurization (HDS). The resulting materials had a general stoichiometry of Co2xMo1-xS2 ...
Preparation and activity of solid-state hydrodesulfurization catalysts
(Elsevier, 1989-12)
CO hydrogenation over alumina-supported sulfide cluster catalysts
(American Institute of Chemical EngineersWiley Periodiocals, Inc., 1989-01)
Bimetallic Mo-Fe and Mo-Co sulfide clusters were anchored on Al 2 O 3 and used for CO hydrogenation. In addition to methane, significant amounts of dimethyl ether were produced. The reaction orders obtained from power ...
Microstructure and reactivity of supported bimetallic platinum-gold catalysts
(Elsevier, 1989-12)
In this paper an attempt is made to correlate the microstructure of a supported bimetallic catalyst system with its activity and selectivity. A series of bimetallic platinum-gold catalysts supported on high-surface-area ...