Results 21 to 30 of about 8,910,109 (261)

Population genetic structure of Patagonian toothfish (Dissostichus eleginoides) in the Southeast Pacific and Southwest Atlantic Ocean [PDF]

open access: yesPeerJ, 2018
Previous studies of population genetic structure in Dissostichus eleginoides have shown that oceanographic and geographic discontinuities drive in this species population differentiation. Studies have focused on the genetics of D.
Cristian B. Canales-Aguirre   +4 more
doaj   +2 more sources

Physical activity and sedentary behavior patterns and sociodemographic correlates in 116,982 adults from six South American countries: the South American physical activity and sedentary behavior network (SAPASEN)

open access: yesInternational Journal of Behavioral Nutrition and Physical Activity, 2019
BackgroundPhysical inactivity and sedentary behavior are major concerns for public health. Although global initiatives have been successful in monitoring physical activity (PA) worldwide, there is no systematic action for the monitoring of correlates of ...
A. Werneck   +6 more
semanticscholar   +1 more source

A new genus of pipimorph frog (Anura) from the Early Cretaceous Crato Formation (Aptian) and the evolution of South American tongueless frogs

open access: yesJournal of South American Earth Sciences, 2019
Pipimorpha is a clade of tongueless anurans with a wide fossil record. Furthermore, the oldest South American fossils come from the Late Cretaceous (Cenomanian) of Patagonia, Argentina.
I. S. Carvalho   +6 more
semanticscholar   +1 more source

Analysis of the human Y-chromosome haplogroup Q characterizes ancient population movements in Eurasia and the Americas [PDF]

open access: yes, 2019
Background: Recent genome studies of modern and ancient samples have proposed that Native Americans derive from a subset of the Eurasian gene pool carried to America by an ancestral Beringian population, from which two well-differentiated components ...
Achilli, Alessandro   +16 more
core   +7 more sources

Genomic Insights into the Ancestry and Demographic History of South America. [PDF]

open access: yesPLoS Genetics, 2015
South America has a complex demographic history shaped by multiple migration and admixture events in pre- and post-colonial times. Settled over 14,000 years ago by Native Americans, South America has experienced migrations of European and African ...
Julian R Homburger   +12 more
doaj   +1 more source

A deforestation-induced tipping point for the South American monsoon system

open access: yesScientific Reports, 2017
The Amazon rainforest has been proposed as a tipping element of the earth system, with the possibility of a dieback of the entire ecosystem due to deforestation only of parts of the rainforest.
N. Boers   +3 more
semanticscholar   +1 more source

Tectonic overview of the West Gondwana margin [PDF]

open access: yes, 2008
The oceanic southern margin of Gondwana, from southern South America through South Africa, West Antarctica, New Zealand (in its pre break-up position), and Victoria Land to Eastern Australia is one of the longest and longest-lived active continental ...
Pankhurst, Robert J., Vaughan, Alan P.M.
core   +1 more source

Development and Influence of Military Medicine during the Korean War: the Medical Field Service School and Training in the U.S. [PDF]

open access: yesUisahak, 2023
This study investigates the development of military medicine during the Korean War, with a focus on the role of the Medical Field Service School and training programs in the United States.
Jinhyouk KIM
doaj   +1 more source

A high-resolution history of the South American Monsoon from Last Glacial Maximum to the Holocene

open access: yesScientific Reports, 2017
The exact extent, by which the hydrologic cycle in the Neotropics was affected by external forcing during the last deglaciation, remains poorly understood.
V. Novello   +12 more
semanticscholar   +1 more source

Hidden Voices and Gothic Undertones: Slavery and Folklore of the American South

open access: yeseTropic: electronic journal of studies in the tropics, 2019
African American folklore embodies themes of the Tropical Gothic. It has an air of mystery as it has a deeper meaning underneath the different layers of plot.
Jennifer Dos Reis Dos Santos
doaj   +3 more sources

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