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Biosynthetic studies on vitamin B₁₂
(1987)
The role of folates in the enzymatic formation of the porphyrin macrocycles was investigated. Uroporphyrinogen III cosynthetase-free hydroxymethylbilane synthase from Rhodopseudomonas spheroides was incubated with the ...
Studies in enzymatic peptide synthesis
(1988)
Chapter I. The incorporation of D-amino acids into peptides via kinetic approach enzymatic peptide synthesis is examined. D-amino acid esters were found to be fairly efficient acyl-acceptors under conditions of high organic ...
Structure and dynamics of functionalized polyethylene surfaces
(1989)
We have used spectroscopically labeled polyethylene films to investigate the effects of solvent upon the reactivity, mobility and accessibility of functional groups at the polyethylene-solvent interface. These results ...
The development and evaluation of coincidence counting TOF-MS
(1991)
Coincidence counting has been combined with time-of-flight mass spectrometry (TOF-MS) in a study of the relationships of secondary ions desorbed by keV and MeV energy primary ions. Secondary ions are in coincidence with ...
Enzymes in organic synthesis : aldolase-catalyzed reactions for the synthesis of unusual sugars
(1990)
Several aspects of the use of enzymes in organic synthesis have been explored. Fructose-1,6-diphosphate aldolase (FDP aldolase) is available commercially and has been cloned and overexpressed in E. coli. Both aldolases ...
The effect of translational energy on trapping and detection in fourier transform ion cyclotron resonance mass spectrometry
(1989)
Fourier transform ion cyclotron resonance (FT-ICR) is the observation of an image current induced by a well defined ion packet, consequently the high resolution and high sensitivity arise from the ability to produce coherent ...
Formation, characterization, and reactivity of metal-oxygen adducts of copper, silver, and gold
(1989)
The coinage metals are oxidised to their respective cations (Cu+, Ag+, and Au+) at potentials that range from -0.20 V vs SCE for Cu to +1.30 V for Au. At glassy carbon hydroxide ion (-OH) is oxidized to O (+0.35 V vs SCE) ...
Development of ²⁵²Cf plasma desorption mass spectrometry for high molecular weight protein analysis
(1991)
Studies were undertaken in instrumentation and methodology to advance the capability of [252]Cf-PDMS for high molecular weight protein analysis. Instrumentation was developed to reduce the background in [252]Cf-PDMS spectra ...
The construction, testing and performance of a Pb/scintillator calorimeter with fiber optic readout built for relativistic heavy ion studies
(1991)
A Pb/scintillator sampling calorimeter covering the pseudorapidity interval of n=0.83 to 4.20 has been designed and constructed for Experiment 814 of Brookhaven National Laboratory. The calorimeter uses wavelength shifting ...
Synthesis and characterization of sulfur-capped trinuclear molybdenum and tungsten clusters
(1992)
The synthesis of molybdenum and tungsten trinuclear clusters is presented. The clusters of interest contain a M3(μ3-S)(μ2-S2)3[^4+] core with nine terminal ligands, i. e. three bound to each metal center. The ligands ...