Now showing items 31-40 of 94
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 ...
Low nanogram detection of nucleotides using fast atom bombardment-mass spectrometry
(Elsevier, 1989-04)
The effect of trimethylsilyl (TMS) derivatization on detection limits of mononucleotides in fast atom bombardment-mass spectrometry (FAB-MS) was examined. FAB-MS methods were developed to optimize sensitivity using adenosine ...
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 ...
Replacement ion chromatography with potentiometric detection using a potassium-selective membrane electrode
(Elsevier, 1989)
The use of a simple potassium-selective membrane electrode as a detector in replacement ion chromatography of both cations and anions is examined. For cation chromatography, separated alkali metal ions are detected in the ...
Hepatic arterial chemotherapy for primary and metastatic liver cancers
(Springer-Verlag, 1989-01)
Hepatic arterial chemotherapy represents a means of selectively exposing hepatic tumor to cytotoxic agents. Although 5-fluoro-2′-deoxyuridine has been shown to generate a higher response rate in the treatment of colorectal ...
Ab initio force fields of alanine dipeptide in C5 and C7 conformations
(Elsevier, 1989-06)
We have followed up our previous ab initio calculations of the force fields and dipole-moment derivatives of glycine dipeptide in C5 and C7 conformations with similar studies of the -alanyl compound [CH3CONHCH(CH3)CONHCH3]. ...
Effect of potassium ion on the phosphorus-31 nuclear magnetic resonance spectrum of the pyridoxal 5'-phosphate cofactor of Escherichia coli -serine dehydratase
(Elsevier, 1989-01)
31P NMR studies were undertaken to determine how potassium ion increases the cofactor affinity of Escherichia coli -serine dehydratase, a model pyridoxal 5'-phosphate requiring enzyme that converts the growth inhibitor ...
Response of human HT-29 colorectal tumor cells to extended exposure to bromodeoxyuridine
(Springer-Verlag, 1989-01)
Effects of the extended exposure of a human colorectal tumor-cell line (HT-29) to bromodeoxyuridine (BrdUrd) were studied in anticipation of the clinical use of that agent to treat colorectal cancer, particularly as a ...