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Altitude is an important factor contributing to the local UV-B climate. In the European Alps solar UV-B increases 21% 1000 m -1 . A Nostoc muscorum (UTEX 389) originating from Scotland and a Nostoc sp. isolated from a highland lake (Yanaqocha) located 3980 m above sea level (Cusco, Peru) have been used in a study where the tolerance to UV radiation (UVR) stress of both species was...
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