Fossil Seeds
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Composição química dos grãos e da cera foliar de variedade Glycine max (L.) Merrill cv. MG/ BR-46 Conquista cultivada sob atmosfera enriquecida de gás carbônico e temperatura elevada
The concentration of carbon dioxide (CO2) has increased in the last decades, due mainly to the combustion of fossil fuels. A gradual increase of the global temperature is expected as a consequence. Soybean is an important crop in most countries, being consumed either as human or domestic animals food. The present work is composed of two chapters, the first d
Publicado em: 07/02/2014
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2. Dispersal Syndromes of fossil Seeds from the Lower Permian of Paraná Basin, Rio Grande do Sul, Brazil
A Análise morfológica das sementes tem sido um importante objeto em estudos ecológicos modernos, uma vez que fornece evidências sobre a biologia e as adaptações das plantas-mãe de sementes. Entretanto, este tipo de estudo tem sido restrito a ecologia de plantas modernas e é raramente utilizado em interpretações de dados paleozóicos. A partir do en
Anais da Academia Brasileira de Ciências. Publicado em: 2012-03
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3. Sementes do gênero Samaropsis Goeppert no Permiano Inferior da Bacia do Paraná, Sul do Brasil / Seeds of the genus samaropsis goeppert in the lower Permian of the Paraná basin, southern Brazil
O afloramento Morro do Papaléo, localizado no município de Mariana Pimentel, Rio Grande do Sul, tem se mostrado uma importante fonte de sementes fósseis preservadas na forma de impressões, as quais são provenientes do Grupo Itararé e da Formação Rio Bonito, Permiano Inferior da bacia do Paraná. Neste estudo são descritos seis diferentes morfotipos
Publicado em: 2010
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4. Análise técnica, econômica e ambiental de macaúba e de pinhão-manso como alternativas de agregação de renda na cadeia produtiva de biodiesel / Technical, environmental, and economic analysis of oil palm and physic nut as an alternative for adding income in the productive chain of biodiesel
With concentration increasing of gases in the atmosphere the greenhouse effect is getting worse and causing the global warming, mainly from burning fossil fuels that has been observed since the Industrial Revolution. It is clear who anthropogenic actions were increasing emissions of greenhouse gases (GHG) and endangers the earth environmental sustainability.
Publicado em: 2010
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5. Uso de resíduo orgânico da produção de biodiesel direta da semente na atenuação dos efeitos de hidrocarbonetos de petróleo no solo. / Use of organic residue from the biodiesel production directly from the seed in the reduction of petroleum hydrocarbons effect in soil.
In the search for energy resources that can minimize the environmental impact in the transportation, refining and distribution of fossil fuels, biodiesel is highlighted as an economically viable alternative and totally renewable if compared to petroleum. With the regulations of Law 11097, from 2005, Brazil became widely known as one of the planet largest pro
Publicado em: 2009
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6. Toward a new synthesis: Major evolutionary trends in the angiosperm fossil record
Angiosperm paleobotany has widened its horizons, incorporated new techniques, developed new databases, and accepted new questions that can now focus on the evolution of the group. The fossil record of early flowering plants is now playing an active role in addressing questions of angiosperm phylogeny, angiosperm origins, and angiosperm radiations. Three
The National Academy of Sciences.
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7. Evolution of the angiosperms: calibrating the family tree.
Growing evidence of morphological diversity in angiosperm flowers, seeds and pollen from the mid Cretaceous and the presence of derived lineages from increasingly older geological deposits both imply that the timing of early angiosperm cladogenesis is older than fossil-based estimates have indicated. An alternative to fossils for calibrating the phylogeny co
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8. On the evolutionary history of Ephedra: Cretaceous fossils and extant molecules
Gnetales comprise three unusual genera of seed plants, Ephedra, Gnetum, and Welwitschia. Their extraordinary morphological diversity suggests that they are survivors of an ancient, more diverse group. Gnetalean antiquity is also supported by fossil data. Dispersed “ephedroid” (polyplicate) pollen first appeared in the Permian >250 million years ago (Myr)
National Academy of Sciences.
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9. Relaxed Molecular Clock Provides Evidence for Long-Distance Dispersal of Nothofagus (Southern Beech)
Nothofagus (southern beech), with an 80-million-year-old fossil record, has become iconic as a plant genus whose ancient Gondwanan relationships reach back into the Cretaceous era. Closely associated with Wegener's theory of “Kontinentaldrift”, Nothofagus has been regarded as the “key genus in plant biogeography”. This paradigm has the New Zealand sp
Public Library of Science.