In various embodiments, the metal oxide or metal hydroxide nanocrystals have reactive atoms...http://www.google.es/patents/US7335808?utm_source=gb-gplus-sharePatente US7335808 - Destroying biological agents such as toxins and bacteria are provided wherein the substance to be destroyed is contacted with finely divided metal oxide or hydroxide nanocrystals and stabilization B???squeda avanzada de pa