Now showing items 11-20 of 55
A solid-phase enzyme-linked assay for vitamin B 12
(Springer-Verlag, 1989-01)
A new solid-phase enzyme-linked competitive binding assay for vitamin B 12 (cyanocobalamin) is described. The assay is based on the competition between analyte B 12 molecules and a glucose-6-phosphate dehydrogenase-vitamin ...
Production and characterization of antisera raised to the manninotrionate group [[alpha]--Galp-(1-->6)-[alpha]--Galp-(1-->6)--gluconate]
(Elsevier, 1989-06-15)
Manninotrionate [[alpha]--Galp-(1-->6)-[alpha]--Galp-(1-->6)--gluconate] was coupled to bovine serum albumin (BSA), and antisera were raised in rabbits to this carbohydrate--protein conjugate. The antisera were studied ...
Monomer-addition growth with a slow initiation step: A growth model for silica particles from alkoxides
(Elsevier, 1989-10-01)
A simplified monomer-addition model with a first-order activation step is developed to describe the dynamics of growth of silica particles from alkoxides. In the limit of slow hydrolysis, we obtain expressions for the ...
Thermodynamics of thallium alkanoates VI. Thallium(I) n-heptanoate revisited
(Elsevier, 1989-04)
The heat capacity of thallium(I) n-heptanoate has been remeasured on a new sample on which the preparative procedures were modified to eliminate the 1-1 (salt+acid) complex (soap) in a previously studied sample. The ...
Mixed copper, zinc 2-amino benzylic organometallics as efficient reagents for the synthesis of heterocycles
(Elsevier, 1989)
The mixed copper, zinc benzylic organometallics 1a-1c react efficiently with various electrophiles. By the reaction with acyl chlorides, highly functionalized 2-substituted indoles are produced. The treatment of 1a with ...
Direct and replacement ion chromatography with potentiometric detection using a silver/silver bromide electrode
(Elsevier, 1989)
The use of Ag/AgX electrodes as potentiometric detectors in modern ion chromatography methods is re-examined. Contrary to previous reports, in both flow-injection and chromatographic experiments the Ag/AgBr electrode is ...
Molecular reaction kinetics inside channel pores: Delayed fluorescence of naphthalene in methanol
(Elsevier, 1989-05-26)
A one-dimensional, diffusion-controlled, reaction is followed in time by phosphorescence (monitoring reactant) and delayed fluorescence (monitoring product). The triplet (excited) naphthalene molecules move in a methanol ...
Ab initio force fields of glycine dipeptide in C5 and C7 conformations
(Elsevier, 1989-02)
Schafer and coworkers have previously derived, with the 4-21 Gaussian basis set ab initio optimized geometries for the glycine dipeptide, CH3CONHCH2CONHCH3, in several conformations. Using their geometries for the C5 and ...
An unusual reductive ring-opening of the 1,2,3,5,6,7-hexaazaacenaphthylene ring system
(Elsevier, 1989)
Studies on an unexpected reaction involving a reductive cleavage of the pyridazine moiety of a tricyclic heterocycle are described. Structure assignments for the products obtained from the reductive cleavage were made using ...
The reactivity of the highly functionalized copper, zinc reagents RCu(CN)ZnI toward 1-haloalkynes and acetylenic esters
(Elsevier, 1989)
The highly functionalized organometallics RCu(CN)ZnI 1 react efficiently with 1-haloalkynes providing polyfunctionalized alkynes in high yields. This method has been used to prepare a pheromone of the Amathes c-nigrum in ...