Words similar to oxygenic
Example sentences for: oxygenic
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4 Ga), and may have been global in extent [ 34 ] . It has been proposed that a major rise in oxygen at this time lowered global temperatures and may have triggered the glaciations [ 35 ] . If this is true, and given the time estimates here, the evolutionary innovation of oxygenic photosynthesis may have had a relatively rapid impact on the environment.
Among the suggested sister groups were the Deinococcales [ 40 ] and spirochetes [ 41 42 ] . Our analyses do not support these earlier claims, but are in agreement with the recent analyses of genes involved in chlorophyll biosynthesis [ 43 ] , which indicated that the low GC Gram positive heliobacteria are closest to the last common ancestor of all oxygenic photosynthetic lineages.
8 Ga [ 14 15 ] usually is considered to be the earliest record of cyanobacteria [ 10 ] . However, the 2-methylhopane biomarker of cyanobacteria has been detected in lower abundance in other prokaryotes, and many taxa (especially anaerobic species) have not been examined for the biomarker [ 15 16 17 ] . Also, the origin of oxygenic photosynthesis may have occurred at some time later than the origin of cyanobacteria.
Geologic evidence bearing on the origin and rise in oxygen likewise has been debated [ 18 19 ] . Although the existence of banded iron formations prior to 3 Ga sometimes has been used as evidence for the early evolution of oxygenic photosynthesis, oxygen-independent mechanisms of iron deposition are known [ 20 ] .
1), including the related origin of oxygenic photosynthesis.
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