One Liner For Congratulations

Homo sapiens since when?

According to the model in force our species H. sapiens developed in Africa about 200,000 years ago and only 100,000 years ago, I leave this continent to spread in Asia (the theory of 'Out of Africa ").
A discovery in the sediments, dated to 200,000 to 400,000 years, the cave Qesem in Israele ora potrebbe riscrivere questa ricostruzione.
Secondo la ricerca pubblicata nel " Am erican Journal of Physical Anthropology " otto denti fossili recuperati dai sedimenti sono molto simili ai caratteri morfologici dei fossili di Skhul/Qafzeh, considerati le piú antiche testimonianze di H. sapiens (ca. 110.000 anni, Israele) al di fuori del continente africano.

Fig.1. Vista di alcuni dei denti recuperati nella caverna di Qesem, datati a 200.000-400.000 anni. La loro attribuzione a H. sapiens al momento é dubbia, se confermata would be the oldest remains of our species outside of Africa (image HERSHKOVITZ et al. 2010).

Fig.2. view of the area of \u200b\u200bexcavations in the cave Qesem near Ha'ayin, west of Tel Aviv (Israel) (image from AP).

If confirmed, this could mean that modern man has developed probably in the Middle East, Africa rather than, sooner than he thought.
However, other experts and the authors of the research, are very cautious - alternatively it is possible that the teeth belonged to the Neanderthal lineage, which is separated 700,000 years ago by ancestors of H. and whose representatives sapiens left Africa earlier. The teeth recovered are not sufficient to clarify the issue, researchers now hope to recover additional fossils from sediments to clarify the membership of species.

Bibliography:

HERSHKOVITZ, I. et al. (2010): Middle Pleistocene dental remains from Qesem Cave (Israel). American Journal of Physical Anthropology. Article first published online: 23 DEC 2010 DOI: 10.1002/ajpa.21446

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News on hominid Denisova

's announcement in February 2010 di DNA mitocondriale ricavato da un osso fossile dalla Siberia era intrigante: la serie di nucleotidi non coincideva con nessuna delle specie di ominidi che si riteneva popolavano la zona 30.000 anni fa - H. sapiens e H. neanderthalensis.
Dopo i primi risultati si ha proseguito nella ricerca, cercando di ricavare materile genetico del nucleo delle cellule dallo stesso reperto. I ricercatori sono rimasti piacevolmente sorpresi, il materiale recuperato era estremenente puro, 70% del DNA (a differenze di una media di pochi percentili in casi analoghi) puó essere attribuito all´ominidi di Denisova.
Gr azie al materiale genetico si ha potuto avvalorare l´ipotesi che il new hominid is a distinct strain that is separated from a common ancestor with the Neanderthals about 300,000 years ago.
Moreover, comparing the DNA sequence data with modern man, we found similarities with the indigenous peoples of Papua New Guinea - Indonesia.
The model developed on these data assumes that the hominid Denisova has first developed in Central Asia by hominids migrated from Africa. Here two lineages have separated - a brought a Neanderthal man who has focused mainly in western Asia and Europe, the other line of evolution over time has shifted eastward.
The DNA research has found further fossil attributed to the new human strain, a large molar, possibly a male hominid, showed a genetic sequence very similar to that of the phalanx bone examined.

Fig.1. phylogenetic tree of mitochondrial DNA analysis (click to enlarge), in gray the 54 representatives of H. modern sapiens (that an individual fossil) in the 6 individuals of blue H. neanderthalensis in red and the hominid Denisova, on the right side of the geographical origin of the material analyzed (by KRAUSE et al. 2010). NB: Images are taken from the publication in risoluzione minore per soli scopi di discussione e didattica.

Bibliografia:

REICH. D. GREEN, R.E.; KIRCHER, M.; KRAUSE, J.; PATTERSON, N. et al. (2010): G enetic history of an archaic hominin group from Denisova Cave in Siberia. Nature 468: 1053-1060
KRAUSE et al. (2010): The complete mitochondrial DNA genome of an unknown hominin from southern Siberia. Nature online publication 24 March 2010: doi:10.1038/nature08976

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snowboard lessons for all levels!

Now fully open Saturday, December 4 ........ Limone Piemonte: partial opening

Saturday 27 and Sunday, November 28, 2010 open later. "Carousel", "Cabanaira", "Pian-Pancani Leone" (22 €)

Auron ISOLA 2000: partial opening Saturday 27 and Sunday, November 28, 2010 entry € 23.60

final opening on December 4

lawn Snowy: partial opening Friday 26 Saturday 27 and Sunday, November 28, 2010

final opening on December 4