March 29th, 2006

homuncul

ЭВОЛЮЦИЯ

the largest and most complex networks - those found in humans and other advanced organisms - require the presence of molecular oxygen.

“You could call it the ‘oxygen imperative. It’s clear that you need molecular oxygen to evolve complex life as we know it.”
http://www.llnl.gov/pao/news/news_releases/2006/NR-06-03-09.html



Science, March 2006
The Effect of Oxygen on Biochemical Networks and the Evolution of Complex Life

The evolution of oxygenic photosynthesis and ensuing oxygenation of Earth's atmosphere represent a major transition in the history of life. Although many organisms retreated to anoxic environments, others evolved to use oxygen as a high–potential redox couple while concomitantly mitigating its toxicity. To understand the changes in biochemistry and enzymology that accompanied adaptation to O2, we integrated network analysis with information on enzyme evolution to infer how oxygen availability changed the architecture of metabolic networks. Our analysis revealed the existence of four discrete groups of networks of increasing complexity, with transitions between groups being contingent on the presence of key metabolites, including molecular oxygen, which was required for transition into the largest networks.

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Если т.н. "сложная" жизнь требует в качестве условия наличия кислорода в атмосфере, и если помнить, что даное условие было обеспечено деятельностью самих же организмов...то возможна интерпретация, согласно которой мы имеем дело с биосферным аналогом эмбриогенеза-развертывания.
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