How To Use Archaean In A Sentence
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Each pool has slightly different mineral content, temperature, salinity, etc., so different pools may contain different communities of archaeans and other microbes.
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Archaean and Proterozoic basement terranes are commonly dissected by swarms of Precambrian mafic dykes.
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However, this mode of emplacement is contradictory to well-established ideas for Archaean granites in the Zimbabwe craton.
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The conditions at Champagne Pool are ideal for thermophilic, mildly acidophilic archaeans such as the Sulfobales and Thermoproteales.
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Now, according to recent experiments made by Mr.H. Nagaoka on the elastic constants of rocks, [88] the mean velocity of seven archaean rocks is 5.1 kms. per sec. for the longitudinal waves, and 2.8 kms. per sec. for the transversal waves -- values which agree so closely with those obtained for the first two series of earthquake-waves as to leave little doubt with regard to their character.
A Study of Recent Earthquakes
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Evidence for life has bee found in the Archaean about 3.8 billion years ago, but life did not become abundant until the Phanerozoic.
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In fact, there are fossil microbes known from throughout the Precambrian, but here a second problem surfaces - how do you distinguish fossil archaeans from fossil bacteria?
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Clark turned to his office, still contemplating the dignity of his visitor, the stark simplicity of this archaean aristocrat.
The Rapids
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The contacts between the complex and the Archaean metamorphic rocks are intrusive.
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Originally an archaean sea-bottom rock this stone lay submerged in the ocean until during the Jurassic Period, under the lateral pressure of a cooling earthcrust the table-lands and mountain-chains of Arizona rose from the seas.
Tales of Aztlan; the Romance of a Hero of our Late Spanish-American War, Incidents of Interest from the Life of a western Pioneer and Other Tales
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These pictures show an immense bloom of a halophilic (‘salt-loving’) archaean species, in a saline pond at a salt works near San Quintin, Mexico.
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The conditions at Champagne Pool are ideal for thermophilic, mildly acidophilic archaeans such as the Sulfobales and Thermoproteales.
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The subject of the photograph is the red archaean colonies growing on the salt crystals, not the salt crystals, themselves.
Halobacterium salinarum - The Panda's Thumb
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Although in common use, the geochemistry of modern arc lavas is not a safe discriminator for the tectonic setting of Archaean volcanic rocks.
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The Philadelphians took to the homeward trail with backward glances and something of regret lest the archaean foundations of that mountain of ore might shift over night.
The Rapids
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Your thirty-three page manuscript combines the brilliance of a young Marcus Paulk with the creative writing of Pierre Deligne, and will surely be devoured by archaean readers everywhere you send it.
Archive 2007-02-01
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A third instance is that paleontological evidence seemed to push the antiquity of life back to the earliest Archaean times.
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At that check, the authors of these tumultuary measures fell to accusing the generals, as if they had marred the proceeding; and the Arcadians and Archaeans banded together, chiefly under the auspices of the two ringleaders, Callimachus the Parrhasian and
Anabasis
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The Archaean Baidrag complex, composed of tonalitic gneiss, granulite and amphibolite, with minor marble and quartzite, has been interpreted as a microcontinental block.
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Brasier et al., however, questioned the biogenic validity of microfossils from the early Archaean Apex Chert in Australia and suggested that they may be artefacts created by abiogenic processes.
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The phylogeny of archaeans is based on molecular sequences in their DNA.
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As regards Kaiser Wilhelm Land, the Gaussberg is a volcanic cone mainly composed of leucite-basalt, but its slopes are strewn with erratics presumably transported from the south and these include gneiss, mica-schist and quartzite, apparently Archaean.
Perspective of Antarctica in 1911
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All this is of historic record in stony cypher of geology indelibly engraved by time on the rocky walls of deepest canyons, as traceable from the primordial archaean to our present era, the age of man.
Tales of Aztlan; the Romance of a Hero of our Late Spanish-American War, Incidents of Interest from the Life of a western Pioneer and Other Tales
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Later days DNA has in bacteria and archaebacteria bottlenecked through 70 Celsius, which is roughly the temperature the sediment chert isotopic ratios gives for most of Earth Archaean history.
Astronomers Find Super-Earth With An Atmosphere | Universe Today
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Thus, the argument of Vestigian et al. 2006 that the universal genetic code did not originate in a frozen accident (in an actual cell), but arose communally, entails that n instances of the universal code (say, in H. sapiens, E. coli, and any archaean) do not indicate common ancestry from an actual cell — contra Dawkins, and most biology textbooks.
A Disclaimer for Behe?
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Nor does it cease till the progress of the warmer day removes the northern ice-dam, sets free the flood, and the region of archaean rocks stands bare and dry.
The Arctic Prairies : a Canoe-Journey of 2,000 Miles in Search of the Caribou; Being the Account of a Voyage to the Region North of Aylemer Lake
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Like bacteria, archaeans have no internal membranes and their DNA exists as a single loop called a plasmid.
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An 'archaean' is a division of living beings, not a historical people.
The flogging will continue
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The geological history of Archaean greenstone belts is controversial and, to date, no tectonic model for their evolution has been agreed upon.
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Two types of terrain are especially characteristic of Archaean geology: greenstone - granite terrains and granulite - gneiss terrains.
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The Archaean Baidrag complex comprises tonalitic granulites and metasediments.
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Such conditions, while toxic to plants and animals, can be quite cozy for archaeans.
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An archaean converts DNA into proteins very differently from, say, Streptococcus—in fact, protein synthesis in Archaea is more similar to the human process than to bacteria.
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As regards Kaiser Wilhelm Land, the Gaussberg is a volcanic cone mainly composed of leucite-basalt, but its slopes are strewn with erratics presumably transported from the south and these include gneiss, mica-schist and quartzite, apparently Archaean.
Perspective of Antarctica in 1911
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Underlying the region is Archaean granite, gneiss and mica-schist formations typical of the Congo basin.
Okapi Faunal Reserve, Democratic Republic of Congo
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Of these, the vast majority comprise late Archaean tonalitic gneiss with various mafic, ultramafic and metasedimentary enclaves, collectively known as ‘grey gneiss’.
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The composition of and some asumptions on the formation of Archaean greenstone belt arediscussed.
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This could represent a xenocryst derived from Archaean basement rocks of the region.
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The contacts between the complex and the Archaean metamorphic rocks are intrusive.
