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http://www.wtnrradio.com/news/story.php?story=262

From the 'haus.This slime, a collection of several fungi actually, was more than just surviving in a radioactive environment, it was actually using gamma radiation as a food source. The fungi appear to use melanin, a chemical found in human skin as well, in the same fashion as plants use chlorophyll. Casadevall and his co-researchers then set about performing a variety of tests using several different fungi. Two types - one that was induced to make melanin (Crytococcus neoformans) and another that naturally contains it (Wangiella dermatitidis) - were exposed to levels of ionizing radiation approximately 500 times higher than background levels. Both of these melanin-containing species grew significantly faster than when exposed to standard background radiation. That is to say, the melanin molecule gets struck by a gamma ray and its chemistry is altered. This is an amazing discovery, no one had even suspected that something like this was possible.
"Just as the pigment chlorophyll converts sunlight into chemical energy that allows green plants to live and grow, our research suggests that melanin can use a different portion of the electromagnetic spectrum - ionizing radiation - to benefit the fungi containing it," said co-researcher Ekaterina Dadachova. Interestingly, the melanin in fungi is no different chemically from the melanin in our skin, leading Casadevall to speculate that melanin could be providing energy to skin cells.