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Genetic Diversity of Helicobacter pylori Isolates in Sudan

von Dr. Wael Faroug Elamin

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[1.] Wfe/Fragment 016 02 - Diskussion
Zuletzt bearbeitet: 2016-01-09 22:04:43 Hindemith
Fragment, Gesichtet, SMWFragment, Schutzlevel sysop, Verschleierung, Wfe, Wikipedia Recent African origin of modern humans 2007

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Seite: 16, Zeilen: 2-15
Quelle: Wikipedia Recent African origin of modern humans 2007
Seite(n): 1 (online source), Zeilen: -
Assuming only relatively recent migrants from Africa gave rise to today's non- African humans, there could have been more than one migration that left descendants. Two routes for the migration out of Africa have been assumed (Forster and Matsumura, 2005). The first and most obvious route is from Egypt, across the Sinai into the Levant. This route is confronted by the major obstruction of the arid zone of the Sahara and Sinai deserts, and thus tends to be only passable during the short periods of interglacial optimum when the Sahara is covered by fresh water lakes, rivers and abundant game. The second route only opened when sea levels fell; it is across the Bab-el-Mandeb, between Yemen and Djibouti. This route too is obstructed by a barrier, the Red Sea and its hazardous reefs, and so is usually only opened when there is a major fall in sea levels. At the times at which sea levels were low, this area is also one of high aridity, probably keeping a beachcombing human population close to the ancient shorelines, which are now well below sea-level, making the finding of early human fossils there very difficult.

Forster, P., and S. Matsumura, Evolution. Did early humans go north or south?, Science, 308 , 965-966, 2005.

Assuming only relatively recent migrants from Africa gave rise to today's non-African humans, was there more than one migration that left descendants? (for example, one each via the north and south ends of the Red Sea)

There are two possible routes out of Africa.

1. The first and most obvious one is from Egypt, across the Sinai into the Levant. This route is confronted by the major impediment of the arid zone of the Sahara and Sinai deserts, and thus tends to be only passable during the short periods of interglacial optimum when the Sahara is covered by fresh water lakes, rivers and abundant game.
2. The second route, only opened when sea levels fall is across the Bab-el-Mandeb, between Yemen and Djibouti/Eritrea. This route too is confronted by a barrier, this time the Red Sea and its hazardous reefs, and so is usually only opened when there is a major fall in sea levels. Although, humans must have had ocean-going vessels at least 60,000 years ago to reach Australia, which was separated by a minimum of 80 miles of ocean even at the ocean's lowest level, so it is also possible that humans had vessels capable of crossing a gap of ocean at the strait of Aden not long earlier. This area, at the times at which sea levels were low, is also an area of high aridity, probably keeping a beachcombing human population close to the ancient shorelines, now well below sea-level, making the finding of early human fossils here very difficult.
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The source is not mentioned.

Sichter
(Hindemith) Schumann


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