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Subject: Did asbestos help life evolve?
Replies: 5 Views: 621
dk_bhat 5.05.09 - 06:53am
THINK IT... *
dk_bhat 5.05.09 - 06:54am
EARTHQUAKES and asbestos may seem an unlikely alliance to help life evolve on early Earth, yet they could have done just that. *
dk_bhat 5.05.09 - 06:54am
Sea-floor fissures lined with an asbestos mineral called chrysotile are places where life could have gained a foothold 3.5 billion years ago. To mimic that environment, Naoto Yoshida and Nori Fujiura of the University of Miyazaki in Japan formed a bacterial biofilm on a layer of gum. *
dk_bhat 5.05.09 - 06:54am
They added chrysotile minerals, bacterial DNA molecules called plasmids that had genes for antibiotic resistance, and silica beads representing inert rock. They then shook the mix for 60 seconds to mimic the low-energy tremors that would have occurred early in Earth's history.
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dk_bhat 5.05.09 - 06:54am
Afterwards, when antibiotics were added to kill the bacteria, they found that about 1 in 10,000 had picked up the resistance genes *
dk_bhat 5.05.09 - 06:54am
It makes sense, says David Cohen, at the University of New South Wales in Sydney, Australia. The little mineral needles are puncturing the cells and allowing the plasmids in. It's the same mechanism that punctures lung cells in asbestosis *
