"I am curious about what effect an asteroid impact, like the one that killed the dinosaurs, would have on the orbit of the earth."
Content with the tag: “nitrogen fixation”
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An Alternative Path for the Evolution of Nitrogen Fixation
Bayesian inferred phylogenetic reconstruction of Anf/Vnf/NifD, BchN, and NflD proteins. The putative substrates and cofactors for each protein lineage are indicated below each respective clade.
A team of researchers supported by the NASA Astrobiology Institute (NAI) has proposed an new path in the evolution of biological nitrogen fixation on Earth. Nitrogen is one of the most important elements for life on Earth, and astrobiologists have long been interested in its role in the history and evolution of life.Nitrogen is abundant on our planet as an atmospheric gas. However, in order for Nitrogen to be accessible for life, it must be converted into other chemical forms. A key step in the global cycling of nitrogen is biological nitrogen fixation,...
February 8, 2012 / Posted by: Aaron Gronstal
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Found: A Hyperthermophilic Nitrogen Fixer
Researchers from NAI’s Carnegie Institution of Washington Team have published in Science their findings of a novel archaeon who’s ability to fix nitrogen at 92 degrees Celcius has officially increased the upper limit of biological nitrogen fixation by 28 degrees Celcius. The hyperthermophilic methanogen was isolated from a hydrothermal vent. Thier findings could reveal a broader range of conditions for life in the subseafloor biosphere.
Source: [Link]
December 14, 2006 / Posted by: Shige Abe
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