Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 5 de 5
Filtrar
Más filtros

Banco de datos
País/Región como asunto
Tipo del documento
País de afiliación
Intervalo de año de publicación
1.
Nature ; 570(7760): 182-188, 2019 06.
Artículo en Inglés | MEDLINE | ID: mdl-31168093

RESUMEN

Northeastern Siberia has been inhabited by humans for more than 40,000 years but its deep population history remains poorly understood. Here we investigate the late Pleistocene population history of northeastern Siberia through analyses of 34 newly recovered ancient genomes that date to between 31,000 and 600 years ago. We document complex population dynamics during this period, including at least three major migration events: an initial peopling by a previously unknown Palaeolithic population of 'Ancient North Siberians' who are distantly related to early West Eurasian hunter-gatherers; the arrival of East Asian-related peoples, which gave rise to 'Ancient Palaeo-Siberians' who are closely related to contemporary communities from far-northeastern Siberia (such as the Koryaks), as well as Native Americans; and a Holocene migration of other East Asian-related peoples, who we name 'Neo-Siberians', and from whom many contemporary Siberians are descended. Each of these population expansions largely replaced the earlier inhabitants, and ultimately generated the mosaic genetic make-up of contemporary peoples who inhabit a vast area across northern Eurasia and the Americas.


Asunto(s)
Genoma Humano/genética , Migración Humana/historia , Asia/etnología , ADN Antiguo/análisis , Europa (Continente)/etnología , Pool de Genes , Haplotipos , Historia del Siglo XV , Historia Antigua , Historia Medieval , Humanos , Indígenas Norteamericanos , Masculino , Siberia/etnología
2.
Opt Express ; 21(22): 27043-56, 2013 Nov 04.
Artículo en Inglés | MEDLINE | ID: mdl-24216928

RESUMEN

We demonstrate a robust and simple method for measurement, stabilization and tuning of the frequency of cw mid-infrared (MIR) lasers, in particular of quantum cascade lasers. The proof of principle is performed with a quantum cascade laser at 5.4 µm, which is upconverted to 1.2 µm by sum-frequency generation in orientation-patterned GaAs with the output of a standard high-power cw 1.5 µm fiber laser. Both the 1.2 µm and the 1.5 µm waves are measured by a standard Er:fiber frequency comb. Frequency measurement at the 100 kHz-level, stabilization to sub-10 kHz level, controlled frequency tuning and long-term stability are demonstrated.

3.
Sci Adv ; 7(4)2021 01.
Artículo en Inglés | MEDLINE | ID: mdl-33523926

RESUMEN

The transition from Stone to Bronze Age in Central and Western Europe was a period of major population movements originating from the Ponto-Caspian Steppe. Here, we report new genome-wide sequence data from 30 individuals north of this area, from the understudied western part of present-day Russia, including 3 Stone Age hunter-gatherers (10,800 to 4250 cal BCE) and 26 Bronze Age farmers from the Corded Ware complex Fatyanovo Culture (2900 to 2050 cal BCE). We show that Eastern hunter-gatherer ancestry was present in northwestern Russia already from around 10,000 BCE. Furthermore, we see a change in ancestry with the arrival of farming-Fatyanovo Culture individuals were genetically similar to other Corded Ware cultures, carrying a mixture of Steppe and European early farmer ancestry. Thus, they likely originate from a fast migration toward the northeast from somewhere near modern-day Ukraine-the closest area where these ancestries coexisted from around 3000 BCE.

4.
Acta Med Hist Adriat ; 15(1): 67-72, 2017 06.
Artículo en Inglés | MEDLINE | ID: mdl-28767263

RESUMEN

The goal of this study is a comprehensive examination of openings discovered on two skulls in the collection of skeletal remains from the Loyalty Islands (Melanesia). The skull No. 1524 displayed an evidence of successful trepanation, and the skull No. 7985 revealed openings that were reminiscent of a trepanation, however, we are inclined to believe that in the latter case we are dealing with a rare genetic anomaly - enlarged parietal foramen.


Asunto(s)
Cráneo/patología , Cráneo/cirugía , Trepanación/historia , Historia del Siglo XVIII , Historia del Siglo XIX , Humanos , Masculino , Nueva Caledonia , Trepanación/efectos adversos , Trepanación/estadística & datos numéricos , Adulto Joven
5.
Science ; 358(6363): 659-662, 2017 11 03.
Artículo en Inglés | MEDLINE | ID: mdl-28982795

RESUMEN

Present-day hunter-gatherers (HGs) live in multilevel social groups essential to sustain a population structure characterized by limited levels of within-band relatedness and inbreeding. When these wider social networks evolved among HGs is unknown. To investigate whether the contemporary HG strategy was already present in the Upper Paleolithic, we used complete genome sequences from Sunghir, a site dated to ~34,000 years before the present, containing multiple anatomically modern human individuals. We show that individuals at Sunghir derive from a population of small effective size, with limited kinship and levels of inbreeding similar to HG populations. Our findings suggest that Upper Paleolithic social organization was similar to that of living HGs, with limited relatedness within residential groups embedded in a larger mating network.


Asunto(s)
Genoma Humano , Conducta Reproductiva/historia , Conducta Social/historia , ADN Antiguo , Historia Antigua , Humanos , Densidad de Población , Federación de Rusia
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA