Results 131 to 140 of about 862 (268)

Atlantic trade and the West African market economy: New evidence from cowry imports, 1650–1905

open access: yesThe Economic History Review, EarlyView.
Abstract Between the seventeenth and twentieth centuries, billions of cowries arrived in West Africa, leaving one of the few quantitative traces available for historians to measure the Atlantic trade's impact on the precolonial market economy. Yet, current estimates substantially underestimate the volume of cowry imports.
María José Pont Cháfer
wiley   +1 more source

Development of Arsenopyrite Reference Materials (Sacra and Niko) for In situ Multiple Sulfur Isotope Measurement

open access: yesGeostandards and Geoanalytical Research, EarlyView.
Key Points New arsenopyrite reference materials (Niko and Sacra) for in situ multiple sulfur isotope measurement. Niko and Sacra are homogenous, near‐stoichiometric arsenopyrite. Niko serves as a primary matrix‐matched reference material, with lower measurement repeatability; Sacra is recommended as a secondary reference and quality control material ...
Bruna Coldebella   +4 more
wiley   +1 more source

Can genetics help us understand Indian social history? [PDF]

open access: yesCold Spring Harb Perspect Biol, 2014
Thapar R.
europepmc   +1 more source

Anthropogenic and natural factors are associated with bird dawn chorus onset in subtropical East Asia

open access: yesIbis, EarlyView.
Anthropogenic factors such as artificial lighting at night (ALAN) and natural factors including temperature and moonlight can affect the dawn chorus pattern in birds. However, most studies are conducted in temperate regions. We investigated the effect of anthropogenic and natural factors on dawn chorus timing in eight species of bird across Hong Kong ...
Ann W. Y. To, Sarah A. Collins
wiley   +1 more source

Towards a unified publicly accessible database of avian type specimens

open access: yesIbis, EarlyView.
Type specimens represent the crucial physical reference for any scientific bird name, but type material is scattered widely across the globe, and there is still no one comprehensive source documenting the presence, status and condition of all avian type specimens, as well as associated information on nomenclature and the validity of individual names ...
Guy M. Kirwan   +6 more
wiley   +1 more source

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