W. S. Veeman

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NMR quantum computing with qubit systems represented by nuclear spins (I=12) in small molecules in liquids has led to the most successful experimental quantum information processors so far. We use the quadrupolar spin-32 sodium nuclei of a NaNO3 single crystal as a virtual two-qubit system. The large quadrupolar coupling in comparison with the environmental(More)
A Pseudomonas aeruginosa biofilm is studied with pulsed field gradient echo nuclear magnetic resonance. Although not all spectral components are assigned yet, the experimental results show that a biofilm consists of components with very different diffusion coefficients. The various biofilm components that give motionally narrowed 1H NMR signals, can be(More)
Solid-state 13C magic-angle spinning NMR spectroscopy has been employed to study the conformation of the 11-cis-retinylidene Schiff base chromophore in bovine rhodopsin. Spectra were obtained from lyophilized samples of bovine rhodopsin selectively 13C-labeled at position C-5 or C-12 of the retinyl moiety, and reconstituted in the fully saturated(More)
Female gymnasts have a delayed onset and probably retarded progression of puberty. The aim of this study was to test the hypothesis that the delay in onset of puberty in gymnasts as compared to girl swimmers is modulated by a lower estrone level due to a smaller amount of body fat. The sex-hormone and gonadotropin levels of 46 gymnasts and 37 girl swimmers(More)
In relation to drug release properties the lateral and rotational mobility of two drugs and one drug mimic in photopolymerized poly(ethylene glycol) diacrylate (PEGDA) networks were investigated by nuclear magnetic resonance as a function of the network cross-link density and temperature. The network mesh size affects the lateral diffusivity for all drugs,(More)
Magic angle spinning 13C NMR was used to study tobacco mosaic virus (TMV) in solution. Well-resolved 13C NMR spectra were obtained, in which several carbon resonances of amino acids of the TMV coat protein subunits that are not observable by conventional high-resolution NMR spectroscopy can be designed. RNA resonance were absent, however, in the magic angle(More)
The spin density matrix formalism has been applied to rotational-echo double-resonance (REDOR), transferred-echo double-resonance (TEDOR) and two-dimensional (2D) TEDOR experiments in order to obtain an expression for the signal intensities. TEDOR spectra of 15N-labeled glycine were measured with different dipolar evolution times. 2D-TEDOR spectra were(More)
H MAS NMR study of water absorbed in open single-wall carbon nanotubes (SWCNTs) of average diameter 1.0 nm, synthesized with a Fe catalyst, was performed. Magic angle spinning significantly increases the spectral resolution and the spectrum shows that there are at least two distinct chemical shift regions for the water proton. From temperature dependent(More)
A direct radioimmunoassay for the determination of ACTH in a small volume of serum was developed using a commercially available antiserum and tracer. A single-stage radioimmunoassay with an incubation period of 4 days gave reliable and reproducible ACTH values. In the incubation medium 0.1% 2-mercaptoethanol was used as the antioxidant. During a 15-month(More)