Hypoxia, very low levels of oxygen in glioma, plays a crucial role in resistance to radiotherapy because oxygen must be present for optimal fixation of DNA damage induced by ionizing radiation. (sciencedaily.com)
By treating the produce for a week with low levels of oxygen at 20ºC, they were able to prevent scald formation, a type of injury associated with prolonged cold storage. (treehugger.com)
Sponges similar to the world's first animals can survive in water containing extremely low levels of oxygen. (newscientist.com)