Results 51 to 60 of about 563,418 (218)

Update on Ouratea cidiana Sastre (Ochnaceae), a microendemic species from the Amazon: enlightening the identity and conservation status

Nordic Journal of Botany, EarlyView.
Ouratea cidiana (Ochnaceae) is a microendemic shrub species from the Brazilian Amazonia, occurring along the banks of the Trombetas River and restricted to the Cachoeira Porteira region, in western Pará State. Since the original collection nearly forty years ago, no additional records have been made, which is concerning given the continuous decline in ...
Clebiana de Sá Nunes, Mayara Dias Caldas, Fúvio Rubens Oliveira‐da‐ Silva, Anna Luiza Ilkiu‐ Borges, André dos Santos Bragança Gil   +4 more
wiley   +1 more source

Características morfológicas da confluência dos rios Negro e Solimões (Amazonas, Brasil)

Brazilian Journal of Geology
Resumo: A confluência dos rios Negro e Solimões, que origina o Rio Amazonas, está situada na faixa da neotectônica transcorrente que se estende de leste para oeste na parte central da Bacia do Amazonas.
Elena Franzinelli
doaj   +1 more source

Muyrakytã ou muiraquitã, um talismã arqueológico em jade procedente da Amazônia: uma revisão histórica e considerações antropogeológicas [PDF]

Acta Amazonica, 2002
Aparentemente os primeiros dados documentados sobre a história dos muiraquitãs, ainda que inferidos, surgem com Orellana, tido como o primeiro explorador a navegar o rio Amazonas rio baixo, ainda em 1542, quando teria combatido com índias guerreiras ...
Marcondes Lima da COSTA, Anna Cristina Resque Lopes da SILVA, Rômulo Simões ANGÉLICA   +2 more
doaj   +1 more source

Cybianthus anthuriophyllus (Primulaceae), a new record for the flora of Colombia: distribution modeling and conservation assessment

Nordic Journal of Botany, EarlyView.
Cybianthus anthuriophyllus (Primulaceae) was previously known from eastern Ecuador and northern Peru. Here we document the first confirmed occurrences of this species in Colombia and develop a distribution model based on collections from the Andean–Amazonian foothills of Caquetá, Cauca, and Putumayo departments, in order to clarify its conservation ...
David Hoyos, Juan Sebastián Moreno, Jorge Luis Contreras, Edwin Trujillo‐ Trujillo, David Sanín   +4 more
wiley   +1 more source

Android malware detection with MH-100K: An innovative dataset for advanced research

Data in Brief, 2023
High-quality datasets are crucial for building realistic and high-performance supervised malware detection models. Currently, one of the major challenges of machine learning-based solutions is the scarcity of datasets that are both representative and of ...
Hendrio Bragança, Vanderson Rocha, Lucas Barcellos, Eduardo Souto, Diego Kreutz, Eduardo Feitosa   +5 more
doaj   +1 more source

Synthesis and application of alginate@CuFe2O4 polymeric spheres in 17‐β‐estradiol adsorption processes in Amazonian rivers

Polymer International, EarlyView.
Magnetic alginate beads, functionalized with copper ferrite, effectively remove 17‐β‐estradiol from Amazonian water, exhibiting optimized 238.65 μg g−1 capacity, fast 40 min kinetics, easy recovery, and successful remediation. Abstract The presence of endocrine‐disrupting compounds, such as 17‐β‐estradiol, in aquatic ecosystems poses a significant ...
Dante S Silva, Adriano R. S Silva, Yasmin S Medeiros, José R Santos Neto, Jamily L dos Santos, Ananias L dos Santos, Roberta L. S Bernardino, Giulian César S Sá, Leandro A Pocrifka, Sidnei C dos Santos, Emilly C Silva   +10 more
wiley   +1 more source

Illegal Gold Mining in the Brazilian Amazon: Environmental Degradation in Yanomami Indigenous Lands, and Regulatory Failures

Sustainable Development, EarlyView.
ABSTRACT Illegal gold mining has emerged as a major sustainability threat in the Amazon, eroding Indigenous rights, forest integrity, and climate mitigation efforts. This study examines how international market incentives relate to the expansion of illegal mining and associated deforestation within the Yanomami Indigenous Territory (YIT) from 2008 to ...
Shirléia Lago Santos, Ana Claudia de Araujo Moxotó, Jurandir Moura Dutra   +2 more
wiley   +1 more source

Repeated trends in altitudinal gradients of diversity: How habitat filtering and biotic interactions structure ecological communities

Journal of Animal Ecology, EarlyView.
This study reveals that tropical butterfly communities show remarkably consistent elevational patterns of diversity and phylogenetic structure across regions with contrasting evolutionary histories, demonstrating how regional species pools and local ecological factors jointly shape biodiversity along altitudinal gradients.
Raphaël Fougeray, Arlety Roy, Christelle Penager, Guillaume Correa Pimpao, Ronald Mori Pezo, Léo‐Paul Charlet, Nino Page, Ombeline Sculfort, Stéphanie Gallusser, Marianne Elias, Melanie McClure   +10 more
wiley   +1 more source

Os contextos funerários na arqueologia da calha do rio Amazonas

, 2017
Durante um pouco mais de dez anos venho pesquisando as praticas e os gestos funerarios na Amazonia, principalmente no periodo anterior ao contato com as populacoes europeias.
Anne Rapp Py-Daniel
semanticscholar   +1 more source

Viagens pelo Rio das Amazonas

Estudos Ibero-Americanos, 2012
Esta pesquisa encontra-se centrada na literatura de viagem, privilegiando os cronistas de expedições á Amazônia, entre eles Frei Gaspar de Carvajal (1541-42) e Padre Cristóbal de Acunã (1638-39). Busca-se refletir sobre um universo cultural específico, recuperando as representações das Amazonas e do El Dorado, traçada pelos europeus quando das viagens ...
openaire   +2 more sources