Fossilization
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. ESTUDO QUÍMICO DE EFLORESCÊNCIAS SALINAS DO SÍTIO ARQUEOLÓGICO TOCA EXÚ DO JURUBEBA DO PARQUE NACIONAL SERRA DA CAPIVARA, PIAUÍ, BRASIL
Toca Exú do Jurubeba is part of a set of archaeological sites located in the Serra da Capivara National Park (Piauí, Brazil), a region of great world interest due to its archaeological potential, especially rock art. However, rock art is constantly threatened by both natural and anthropic factors. Among the natural salts efflorescences that are deposited o
Quím. Nova. Publicado em: 2017-09
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2. Early Devonian (Late Emsian) shark fin remains (Chondrichthyes) from the Paraná Basin, southern Brazil
ABSTRACT We report on the pioneering discovery of Devonian fish remains in the Paraná Basin, which represents the southernmost record of fishes from that period in mainland South America. The material comes from an outcrop at the lower portion of the São Domingos Formation, within Sequence C of the Paraná-Apucarana sub-basin in Tibagi, State of Paraná. M
An. Acad. Bras. Ciênc.. Publicado em: 2017-03
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3. Paleometry: A brand new area in Brazilian science
Paleometry is a promising research field that brings together different areas, such as physics and chemistry, applied to paleobiological issues. In spite of being recognized abroad, it is a new research field in Brazil. The most important characteristic is the application of mostly non-destructive techniques to the study of fossils. This work compiles some p
Mat. Res.. Publicado em: 2014-12
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4. O ERRO NA APRENDIZAGEM DE INGLÊS-LE: UMA ANÁLISE DA INTERLÍNGUA ESCRITA DE ALUNOS DO NÚCLEO DE LÍNGUAS DA UECE / ERROR IN LEARNING ENGLISH-LE: AN ANALYSIS OF STUDENT INTERLINGUA WRITTEN LANGUAGE OF CORE UECE
Foreign language learners errors have been one of the major concerns of several researchers and teachers in the last forty years, especially after Corder (1974) claimed for their importance to the teaching and learning of languages. Investigations have pointed out that an interlanguage has structures which come from knowledge about the learners first languag
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/09/2009
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5. Caracterização espectroscópica de peixe do período cretáceo (Bacia do Araripe)
The study of fossils has made considerable progress over the last years as a result of the use of new experimental techniques. This paper describes the chemical composition of a fossilized fish of the Cretaceous period, from a 100 million-year-old, material originated from the Araripe Basin (northeastern Brazil). The chemical composition of the fossilized fi
Química Nova. Publicado em: 2007-02
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6. The ANUROFAUNA Of FORMATION CRATO, EOCRETÃCEO Of the BASIN Of the ARARIPE / A ANUROFAUNA DA FORMAÃÃO CRATO, EOCRETÃCEO DA BACIA DO ARARIPE,
The Crato Formation, Araripe Basin, has yielded one of the most important Early Cretaceous fossil assemblages world-wide, being specially famous for the abundance, taxonomic diversity, and exceptional preservation of its fossils. Its beds contain remains of a continental flora and fauna that have been interpreted to represent a lacustrine environment. The ai
Publicado em: 2006
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7. Avaliação das propriedades mecanicas e da morfologia de compositos ternarios de poliamida 6, borracha de etileno-propileno-dieno e fibras curtas de silica / Evaluation of the mechanical properties and the morphology of polyamide 6, ethylene-proyulene-diene rubber and short silica fibers ternary composites
The main goal of this work was to evaluate the incorporation of short silica fibers (SF) and ethylene-propylene-diene rubber, functionalized with maleic anhydride (EPDM-g-MA), in a polyamide 6 (PA 6) matrix. The fiber used as filler is a natural product made up of amorphous silica from the fossilization of multicelular animals. In order to promote a better i
Publicado em: 2005
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8. Dialogue dependency in second language acquisition / DependÃncia dialÃgica na aquisiÃÃo de segunda lÃngua
This study aims to investigate the notion of dialogue dependency - a mirroring process that leads to structural changes, as a process involved in the second language acquisition. Changes are investigated through the different relationships the language learner establishes with elements structured linked in an acquisition structure: the learnerâs speech, the
Publicado em: 2005
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9. Percepção de fossibilização e fatores associados na interlingua de brasileiros adultos aprendendo ingles
The present work, a predominantly qualitative investigation, starts from the initial assumption that the fossilization of the oral production might be a frequent phenomenon among Brazilians learning English. The objective of this study is to describe more precisely this freezing of the leamer s linguistic-communicative competence and to start the search for
Publicado em: 1998
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10. Ultrastructure and cytochemistry of Miocene angiosperm leaf tissues
Angiosperm leaf fossils (16.7-25 × 106 years by potassium/argon dating) referable to Zelkova were isolated from pyroclastic deposits in the Succor Creek Formation, Oregon. These fossils reveal a three-dimensional structure in mesophyll cell layers and vascular bundles, while transmission electron microscopy of fixed tissues reveals well-preserved chloroplas
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11. Resistant tissues of modern marchantioid liverworts resemble enigmatic Early Paleozoic microfossils
Absence of a substantial pretracheophyte fossil record for bryophytes (otherwise predicted by molecular systematics) poses a major problem in our understanding of earliest land-plant structure. In contrast, there exist enigmatic Cambrian–Devonian microfossils (aggregations of tubes or sheets of cells or possibly a combination of both) controversially inter
National Academy of Sciences.