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19 December 2013 12:36 pm ,
Vol. 342 ,
Five federally funded optical and radio telescopes in the United States could be forced to shut down over the next 3...
A 2-year budget agreement pushes back the threat of sequestration but leaves scientists still wondering how much money...
After a decade away from physics, Robert Laughlin, a Nobel laureate at Stanford University in Palo Alto, California,...
Computer scientists and others have teamed up to persuade the 117 state parties to the Convention on Certain...
The swine flu pandemic of late 2009 had a peculiar aftereffect in parts of Europe: a spike in children being diagnosed...
After 20 years of trying, researchers have finally convicted massive volcanic eruptions in Siberia as the culprit in...
- 19 December 2013 12:36 pm , Vol. 342 , #6165
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ScienceShot: Animals That Live Without Oxygen
7 April 2010 1:12 pm
Scientists have found the first multicellular animals that apparently live entirely without oxygen. The creatures reside deep in one of the harshest environments on earth: the Mediterranean Ocean's L'Atalante basin, which contains salt brine so dense that it doesn't mix with the oxygen-containing waters above. Previous samples taken from the water and sediments in the basin showed that single-celled life was present, but a new study published this week in BMC Biology has identified multi-cellular animals that apparently live and reproduce in the sediments under the salt brine. Italian and Danish researchers describe three new species of tiny animals called Loricifera. The animals took up radioactively tagged leucine (an amino acid), and a fluorescent probe that labels living cells, evidence that they were alive when they were collected. The researchers also found examples of individuals that contained eggs and evidence of apparent molting, which led them to conclude that the animals spend their whole lives in the harsh sediments. The creature's cells apparently lack mitochondria, the organelles that use oxygen to power a cell. Instead they are rich in what seem to be hydrogenosomes, organelles that can do a similar job in anaerobic (or oxygen free) environments. The find could help scientists understand what life might have looked like in the earth's early oceans, which also had very little oxygen.