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?
- New Tractor Beam Can Repel And Attract
- Amenhotep III: Ancient Egyptian Mummies Didn't Have Spinal Arthritis
- #GAMERGATE Style Harassment Does Not Happen in the Male Dominated Sciences
- Get A Heart On: Viagra Is Good Outside The Bedroom Too
- How Mitochondria Began - Parasitic Coevolution Gets A New Wrinkle
- Psychiatry Should Switch From Symptom-based Prescriptions To Target-based
- From Mindless Physics To Physics Of Mind
- "I believe in an evolutionary universe as well. Perhaps this thing we call god is an alien or something..."
- "Problem. In the USA and New Zealand you've got Direct To Consumer Advertising, that is, the companies..."
- "Because you did not present any sound alternative. You set up the strawman with a false dishcotomy..."
- "Why do you keep on posting your irrelevant articles under a physics forum? ..."
- "This is interesting. Heroin use really is skyrocketing. I firmly believe that if the pill mills..."
- Mutagenesis: One way Europeans wish it was 1936 again
- Closer examination of risk factors for Latinos underscores cultural diversity
- Saving bees requires less pesticides, changing farming
- Could GM plants replace airport security scanners?
- In a battle of brains, chimpanzees match human toddlers
- ‘Urban farmers’ behind GMO labeling initiatives
- Fires in the Egypt River Delta
- Antibiotics may help Salmonella spread in infected animals, Stanford scientists learn
- WSU researchers see how plants optimize their repair
- See-through, one-atom-thick, carbon electrodes powerful tool to study brain disorders
- Gonzalo: First hand account in Bermuda, next stop: The United Kingdom