For most of life on Earth, oxygen is essential, and sunlight is usually needed to produce that oxygen. But in an exciting twist, researchers have caught a common, ocean-dwelling microbe breaking all the rules.
and several of its cousins, called ammonia oxidizing archaea , are able to survive in dark, oxygen-depleted environments by producing oxygen on their own. They do so using a biological process that hasn't been seen before.
While it's previously been established that these microbes can live in environments where oxygen is scarce, what hasn't been clear is what they get up to there – and how they're staying alive for as long as they do. That was the inspiration behind this new research. "These guys are really abundant in the oceans, where they play an important role in the nitrogen cycle,""For this they need oxygen, so it has been a long-standing puzzle why they are also very abundant in waters where there is no oxygen. We thought, do they just hang out there with no function? Are they some kind of ghost cells?"
Collect a bucket of seawater out of the ocean, and every fifth cell will be one of these organisms – that's how common they are. Here, the researchers removed the microbes from their natural habitat and transferred them to the lab.The team wanted to take a closer look at what would happen when all the available oxygen was gone, and there was no sunlight to produce new oxygen.
"We saw how they used up all the oxygen in the water, and then to our surprise, within minutes, oxygen levels started increasing again,"At the moment, the researchers aren't certain how the microbes are pulling off this trick, and the amount of oxygen produced appears to be relatively small – but it does look to be different to the few oxygen-without-sunlight processes that we already know about.gets linked to its production of gaseous nitrogen.
France Dernières Nouvelles, France Actualités
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