Dr Jennifer Loveland-Curtze and a team of scientists from Pennsylvania State University say that a bacterium trapped more than a mile under under glacial ice in Greenland for over 120,000 years may hold clues as to what life forms might exist on other planets.
The microbe, which they have called Herminiimonas glaciei in the current issue of the International Journal of Systematic and Evolutionary Microbiology, is small even by bacterial standards - it is 10 to 50 times smaller than E coli. Its small size probably helped it to survive in the liquid veins among ice crystals and the thin liquid film on their surfaces. Small cell size is considered to be advantageous for more efficient nutrient uptake, protection against predators and occupation of micro-niches and it has been shown that ultramicrobacteria are dominant in many soil and marine environments.
The team showed great patience in coaxing the dormant Herminiimonas glaciei microbe back to life; first incubating their samples at 2˚C for seven months and then at 5˚C for a further four and a half months, after which colonies of very small purple-brown bacteria were seen.
Most life on our planet has always consisted of microorganisms, so it is reasonable to consider that this might be true on other planets as well. Studying microorganisms living under extreme conditions on Earth may provide insight into what sorts of life forms could survive elsewhere in the solar system.
"These extremely cold environments are the best analogues of possible extraterrestrial habitats", said Dr Loveland-Curtze, "The exceptionally low temperatures can preserve cells and nucleic acids for even millions of years. H glaciei is one of just a handful of officially described ultra-small species and the only one so far from the Greenland ice sheet; studying these bacteria can provide insights into how cells can survive and even grow under extremely harsh conditions, such as temperatures down to -56˚C, little oxygen, low nutrients, high pressure and limited space."
"H glaciei isn't a pathogen and is not harmful to humans", Dr Loveland-Curtze added, "but it can pass through a 0.2 micron filter, which is the filter pore size commonly used in sterilization of fluids in laboratories and hospitals. If there are other ultra-small bacteria that are pathogens, then they could be present in solutions presumed to be sterile. In a clear solution very tiny cells might grow but not create the density sufficient to make the solution cloudy".
Article: “Herminiimonas glaciei sp. nov., a novel ultramicrobacterium from 3042 m deep Greenland glacial ice”, Jennifer Loveland-Curtze et al., International Journal of Systematic and Evolutionary Microbiology (2009) 59, 1272 – 1277
- PHYSICAL SCIENCES
- EARTH SCIENCES
- LIFE SCIENCES
- SOCIAL SCIENCES
Subscribe to the newsletter
Stay in touch with the scientific world!
Know Science And Want To Write?
- We're Playing Classical Music All Wrong
- Football Physics: The Science Of Deflategate
- The Plot Of The Week: CMS Search For Majorana Neutrinos
- Superbugs: How Montezuma's Revenge Impacts Society Long After That Trip
- Is Glass A Solid Or A Liquid? Yes
- Atmospheric Warming Heats The Bottom Of Ice Sheets Also
- Deflate-gate: Cheating People versus a Flawed Pre-Game Process
- "Your article makes no sense! What if the pats heat their footballs up to 120 degrees before the..."
- "Thanks as usual for the update. A small typo: annichilate in the third paragraph. And a question..."
- "Error bars are the responsible thing to do. I don't see an aesthetic problem. Nice pix last week..."
- "I think a smaller market means a lot higher quality. We get so many terrible pop songs because..."
- "The air inside a leather football is not an ideal gas. That is what I meant.As far as the..."
- Sociologists discover young women and men prefer egalitarian relationships
- Citizen scientists have positive news for Puget Sound seabirds
- Sleeping on stomach increases risk of sudden death in epilepsy
- BPA exposure during pregnancy correlated to oxidative stress in child, mother
- Ventricular assist devices induce heart muscle regeneration