molecular fossils

molecular fossils

[mə¦lek·yə·lər ′fäs·əlz]
(geology)
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Molecular fossils in chromatograms can indicate what went into oil, under what conditions, and when.
Peaks of bisnorhopanes in the Santa Barbara oil chromatogram (above, center) are telltale molecular fossils indicating that the oil formed in sediments where there was little or no oxygen.
These genes, considered molecular fossils of an ancient born a virus, have also turned up in searches of a variety of other mammalian genomes.
It tells us that virus evolution doesn't proceed the way many people have viewed it" Scientists have long had direct evidence of retroviruses' ancient origins: Molecular fossils of those viruses persist in the genomes of species infected long ago.
By studying the molecular fossils in the cores lifted from drill holes, Love and his colleague, Roger Summons of the Massachusetts Institute of Technology (MIT), have found evidence of animals that lived as long as 751 million years ago.
But by studying the invisible molecular fossils left behind by these animals, Love and Summons can not only tell that these creatures lived--they can actually make some guesses about what they looked like.
Bacterial molecular fossils look different from those fossils left behind by animals, for example.
In our research, we use molecular fossils, or biomarkers, such as oleanane to provide evolutionary and paleoenvironmental information from sediments and petroleum.
coypus by reviewing the current data and establishing a case for the analysis of specific genomic retroposons, molecular fossils of the nutria's evolutionary descent.
Although the morphology and anatomy of both the nutria and guinea pig have traditionally placed them in the Order Rodentia, neither of these gross attributes offers the accuracy of analyzing molecular fossils of past genetic events, as does analysis of specific retroposons.
Because orthologous loci containing SINE or LINE integrations derive from a common origin, these elements provide a molecular fossil record.
Using a sophisticated, multidimensional gas chromatography device, the researchers could distinguish individual archaea-produced chemical compounds within the complex mixture of molecular fossils.

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