South America
Mostrando 37-48 de 1350 artigos, teses e dissertações.
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37. Papilionoideae (Leguminosae) no Chaco brasileiro
Resumo O Chaco é maior domínio de florestas contínuas da América do Sul e agrega distintas famílias botânicas com destaque à Leguminosae. A elevada riqueza e diversidade de membros de Leguminosae, sobretudo de Papilionoideae, aliada à distribuição de determinados gêneros comuns às florestas secas tem motivado a investigação deste interessante g
Rodriguésia. Publicado em: 11/11/2019
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38. Productive potential of superior genotypes of Paspalum notatum Flügge in response to nitrogen fertilization
RESUMO O gênero Paspalum compõe as pastagens naturais das regiões tropicais e subtropicais da América com várias espécies de reconhecido potencial forrageiro. O objetivo deste estudo foi avaliar a influência de diferentes níveis de fertilização nitrogenada sobre os caracteres agronômicos e na eficiência de utilização de nitrogênio por genótip
Rev. bras. saúde prod. anim.. Publicado em: 11/11/2019
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39. Cardiology Training in Brazil and Developed Countries: Some Ideas for Improvement
Resumo Existe enorme variação nos programas de residência em cardiologia no mundo. Em países em desenvolvimento, tal como o Brasil, encontrar o equilíbrio correto entre melhorias nos programas de residência e condições socioeconômicas do país pode ser uma tarefa difícil. Aumentar a duração dos programas ou o número de estágios obrigatórios, p
Arq. Bras. Cardiol.. Publicado em: 04/11/2019
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40. The larva of Neoneura confundens Wasscher and van’t Bosch, 2013 (Odonata, Coenagrionidae) and key to the larvae of genus
Abstract: The beautifully colored damselflies included in Neoneura Selys are divided in 28 species known from North, Central and South America. Larval stage is little known, only seven species were described at this stage. We describe and illustrate the final instar larva of Neoneura confundens for the first time. Adults associated to this larva correspond t
An. Acad. Bras. Ciênc.. Publicado em: 28/10/2019
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41. Analysis of the Seasonal Variation in Chemical Profile of Piper glabratum Kunth Essential Oils Using GC×GC/qMS and Their Antioxidant and Antifungal Activities
Piper glabratum is a plant native from South America, which has been little studied, despite its use in folk medicine. In this study, chemical composition, antioxidant and antifungal activities of essential oils (EOs) from leaves of P. glabratum were investigated. The influence of seasonality on its chemical composition was also evaluated. The chemical chara
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
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42. The rarest of the rare: rediscovery and status of the critically endangered Belem Curassow, Crax fasciolata pinima (Pelzeln, 1870)
Abstract The Belem Curassow (Crax fasciolata pinima) is one of the most endangered birds in South America, without sightings of birds in the wild for 40 years. This subspecies is nationally and internationally classified as critically endangered and close to extinction, suffering from poaching and deforestation in its range. Here we present new records of fr
Pap. Avulsos Zool.. Publicado em: 21/10/2019
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43. Political agency of indigenous peoples: the Guarani-Kaiowa’s fight for survival and recognition
Resumo O artigo examina as estratégias de sobrevivência e reações políticas de grupos indígenas em áreas de fronteiras agrícolas, que são fortemente influenciadas por símbolos culturais, vínculos familiares e respostas vinculadas ao apego pela terra. Discute-se a especificidade da trajetória sócio-espacial dos povos indígenas e, além disso, pr
Vibrant, Virtual Braz. Anthr.. Publicado em: 17/10/2019
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44. Molecular characterization of the invasive aquatic macrophyte Hydrilla verticillata (Hydrocharitaceae) in Brazil
Abstract: Invasive populations of macrophytes are widely distributed and have been successfully introduced and established in freshwater habitats. Hydrilla verticillata was first recorded in 2005 in the Upper Paraná River floodplain and in 2007 at the Itaipu Reservoir (Brazil-Paraguay border, ca. 300 km downstream from its first record). However, its geneti
An. Acad. Bras. Ciênc.. Publicado em: 14/10/2019
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45. Active surveillance of papillary thyroid microcarcinomas in South America: Are we ready?
Arch. Endocrinol. Metab.. Publicado em: 10/10/2019
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46. Aquatic vascular plants of South Brazil: checklist and a comparative floristic approach
ABSTRACT Aquatic ecosystems support species diversity, and knowledge of plant communities is essential for wetland conservation programs. This study provides a checklist of aquatic vascular plants of South Brazil and establishes their floristic affinities with bordering South America phytogeographical domains. The checklist was based on 52 sources, including
Acta Bot. Bras.. Publicado em: 07/10/2019
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47. Invasion and establishment of Ceratium furcoides (Dinophyceae) in an urban lake in Porto Alegre, RS, Brazil
ABSTRACT Ceratium furcoides has received attention due its invasive behavior in South America and consequent alterations in local phytoplankton communities. Pedalinhos Lake had been dominated by chlorophytes until 2015, when the first occurrence of this dinoflagellate was detected. In order to investigate the colonization process of this species, we monitore
Acta Bot. Bras.. Publicado em: 07/10/2019
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48. Species boundary and extensive hybridization and introgression in Petunia
ABSTRACT Studying the role of hybridization in the speciation of plants is one of the most thrilling areas of evolutionary biology. Hybridization in natural populations can act in opposition to divergence, contribute to adaptation through introgression or foster the emergence of new lineages via hybrid speciation. Species of the plant genus Petunia grow in o
Acta Bot. Bras.. Publicado em: 07/10/2019