Bleeding Ice discussion

eric_diablo · 02-25-2009, 07:25 AM

This is a discussion thread for the following file:

Bleeding Ice

Antarctica looks like it's bleeding.

Zenn · 05-31-2009, 12:26 AM

"Unlike the sulfur-powered communities present at undersea vents, there's little indication of a hydrogen sulfide metabolism present in the ice at Blood Falls. Instead, it appears that energy is obtained when sulfur is cycled through different oxidation states by reacting it with iron, producing the Fe(II) seen in the brine. The oxidized sulfur is then used to react with carbon compounds, powering the metabolism. All of that is pretty low-energy-the authors suggest that the doubling time for a bacterium in this environment would be roughly 300 days-and requires an external source of Fe(III) to power the system. The authors posit that the glacier itself might provide the source by extracting new iron as it scrapes across the underlying rocks."

-Source

02-25-2009, 07:25 AM	#1
eric_diablo Junior Member Join Date: Nov 2008 Location: Australia / Spain Posts: 2	Bleeding Ice discussion This is a discussion thread for the following file: Bleeding Ice Antarctica looks like it's bleeding.

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05-31-2009, 12:26 AM	#2
Zenn Junior Member Join Date: May 2009 Posts: 3	"Unlike the sulfur-powered communities present at undersea vents, there's little indication of a hydrogen sulfide metabolism present in the ice at Blood Falls. Instead, it appears that energy is obtained when sulfur is cycled through different oxidation states by reacting it with iron, producing the Fe(II) seen in the brine. The oxidized sulfur is then used to react with carbon compounds, powering the metabolism. All of that is pretty low-energy-the authors suggest that the doubling time for a bacterium in this environment would be roughly 300 days-and requires an external source of Fe(III) to power the system. The authors posit that the glacier itself might provide the source by extracting new iron as it scrapes across the underlying rocks." -Source