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- W2027071210 abstract "A study has been made of the nature of the reactions producing paramagnetic centres (PMCs) at room temperature in poly-1-(β-methacrylyloxyethyl)-3,3-dimethyl-6′-nitrospiro-(indolino-2,2′-[2H-1]benzopyran). It was found that under the action of UV light, which converts some of the spiropyran fragments from the colourless A form (λmax=350 nm) to the coloured B form (λmax=580 nm), charge transfer complexes of the (A-B+) type giving an absorption band with λmax≌480 nm are produced in the system. It is shown that irradiation of the system with longwwave light (λmax≌480 nm) brings about a considerable increase in the concentration of PMCs. From an analysis of the EPR spectra the conclution is drawn that an anion-radical (A−1) formed by transfer of an electron from a coloured fragment to the benzopyran part of the uncoloured material is responsible for the spectra. When the illumination is applied the excess anion-radical decay by a reaction of the first order, at a constant rate k∼0·1 sec−1 in evacuated samples and k=8 × 10−4 sec −1 in samples that have not been evacuated. The strong interaction between the spiropyran side groups is a result of their high density and this is an exclusive characteristic of the homopolymer." @default.
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- W2027071210 date "2003-09-01" @default.
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- W2027071210 title "22 Total tumour tissue levels of tissue inhibitor of metalloproteinases-1 as a prognostic marker in breast cancer: an EORTC validation study of 2984 patients" @default.
- W2027071210 doi "https://doi.org/10.1016/s1359-6349(03)90056-5" @default.
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