Great Plains
Mostrando 13-17 de 17 artigos, teses e dissertações.
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13. Transporte de chumbo e metais associados no Rio Ribeira do Iguape, São Paulo, Brasil
The objective of the present study is to clear some aspects of the transport of Lead and associated metais by suspended particulate matter along the Ribeira de Iguape River, in the southeastern region of the state of São Paulo. Literature data were taken into account, as well as findings gathered trom studies of sediments collected in stations at different
Publicado em: 1997
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14. Paleoindian large mammal hunters on the plains of North America
From ≈11,200 to 8,000 years ago, the Great Plains of North America were populated by small Paleoindian hunting groups with well developed weaponry and the expertise to successfully hunt large mammals, especially mammoths and bison. Mammoths became extinct on the Plains by 11,000 years ago, and, although paleoecological conditions were worsening, their demi
The National Academy of Sciences.
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15. The barley stem rust-resistance gene Rpg1 is a novel disease-resistance gene with homology to receptor kinases
Stem rust caused by Puccinia graminis f. sp. tritici was among the most devastating diseases of barley in the northern Great Plains of the U.S. and Canada before the deployment of the stem rust-resistance gene Rpg1 in 1942. Since then, Rpg1 has provided durable protection against stem rust losses in widely grown barley cultivars (cvs.). Extensive efforts to
The National Academy of Sciences.
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16. Miocene ungulates and terrestrial primary productivity: Where have all the browsers gone?
Progressive changes are observed in both the composition of mammal faunas and vegetation during the Miocene epoch [24–5 mega-annum (Ma)]. These changes are usually interpreted as a response to climatic changes. In the traditional view, forests or woodlands gradually gave way to more open habitats, with grazing (grass-eating) ungulate (hoofed) mammal specie
The National Academy of Sciences.
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17. Ruminal ciliated protozoa in bison.
Ruminal contents from 79 slaughtered bison and 2 ruminally cannulated bison were collected to obtain information on total numbers and species distribution of ciliated protozoa. The bison originated from numerous herds throughout the Great Plains and were grouped into three dietary categories: (i) only forage; (ii) forage with moderate levels of supplementati