Petra J.W Pouwels

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The side chains of tyrosine, tryptophan and histidine are able to produce CIDNP (Chemically Induced Dynamic Nuclear Polarization) signals after laser irradiation in the presence of a suitable radical pair-generating dye. Elicitation of such a response in proteins implies surface accessibility of the respective groups to the light-absorbing dye. In(More)
A series of photo-CIDNP (chemically induced dynamic nuclear polarization) experiments were performed on pyrimidine monomers and dimers, using the electron-donor N alpha-acetyltryptophan (AcTrp) as a photosensitizer. The CIDNP spectra give evidence for the existence of both the dimer radical anion, which is formed by electron transfer from the excited AcTrp*(More)
The light-induced splitting of pyrimidine dimers was studied using the electron acceptor anthraquinone-2-sulfonate (AQS) as a photosensitizer. To this end, photochemically induced dynamic nuclear polarization (photo-CIDNP) experiments were performed on a series of pyrimidine monomers and dimers. The CIDNP spectra demonstrate the existence of both the dimer(More)
A photochemically induced dynamic nuclear polarization (photo-CIDNP) study of carboxymethyllumiflavin-sensitized splitting of pyrimidine dimers has been carried out. In aqueous solution at high pH, an emission signal (delta 3.9 ppm) was observed from the dimer C(6)- and C(6')-protons of an N(1), N(1')-trimethylene-bridged thymine dimer (1). The dimer(More)
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