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A nanobe

Nanobes are tiny filamental structures first found in some rocks and sediments. Some hypothesize that they are the smallest form of life, 1/10th the size of the smallest known bacteria.

Nanobes were discovered in 1996 (published in American Mineralogist, vol 83., 1998) by Philipa Uwins^[1], University of Queensland, Australia.^[2] They were found growing from rock samples (both full-diameter and sidewall cores) of Jurassic and Triassic sandstones, originally retrieved from an unspecified number of oil exploration wells off Australia's west coast. Depths of retrieval were between 3,400 metres (2.1 mi) and 5,100 metres (3.2 mi) below the sea bed. While Uwins et al present assertions against it, they do not exclude the possibility that the nanobes are from a surface contaminant, not from the rock units cited.

The smallest are just 20 nanometers in diameter. Some researchers believe them to be merely crystal growths, but a purported find of DNA in nanobe samples may prove otherwise.^[3] They are similar to the life-like structures found in ALH84001, the famous Mars meteorite from the Antarctic. Recently there has been some interest amongst bio-tech companies in commercial application of nanobes in utilization of plastics. Some researchers believe nanobe-like organisms might be implicated in a number of diseases. They might be responsible for the formation of some types of renal stones. They might even explain mysterious calcification of teeth in the human mouth, and thus actually be a useful or necessary symbiont (like Acidophilus).

Nanobes and nanobacteria are both controversial and unproven concepts; however, these two should not be confused. Nanobacteria are supposed to be walled organisms, while nanobes are hypothesized to be a previously unknown form of life. The origins of discovery, naming, and research methods also differ.

Claims

• It is a living organism (contains DNA or some analogue, and reproduces).
• Has a morphology similar to Actinomycetes and Fungi.
• Nanobes are 20 nm in length which conventional biological knowledge assumes is too small to contain the basic elements for an organism to exist (DNA, plasmids, etc.), suggesting that they may reproduce via some unconventional means, like RNA instead of DNA.
• The Martian meteorite ALH84001, discovered in 1984 in the Antarctic, contained similar tubular structures which some astrobiologists suggested could be evidence of life at an earlier time on Mars.

References

See also

• Mycoplasma genitalium, Pelagibacter ubique — some of the smallest known bacteria
• Nanoarchaeum — smallest known archaeum
• Mimivirus — largest known virus
• Parvovirus — smallest known family of viruses
• Nanobacterium

External links

• Color photo of a nanobe colony
• Definition of nanobe
• Introduction to nanobes
• "Nanobes: A New Form of Life?"
• Nanobe images and links
• Transcript of interview of Phillipa Uwins

Wikipedia content modification information:

• This page was last modified on 1 August 2008, at 17:33.

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