Effects of exogenous nitrogen oxide (NO) on the time course of results of laser Doppler flowmetry (LDF) and biomicroscopy of the buccal sac capillaries were studied in a hamster pre-exposed to UV light. After NO treatment capillary vasodilatation was replaced by vasoconstriction in the focus of UV exposure. Parameters calculated by Dopplerograms indicate an increase of the vascular tone.
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