Results 31 to 40 of about 7,322 (183)

Palaeomagnetism of the Roraima Dolerites [PDF]

Geophysical Journal International, 1968
Consistent palaeomagnetic data have been obtained from 19 out of 31 sampling sites in the thick Proterozoic dolerite sills which intrude the Roraima sandstones of the Guiana Shield in Venezuela and British Guiana (now Guyana). Fourteen of these sites, most of which are in noritic dolerite, have remanence orientations which fall into two significantly ...
openaire   +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

A epidemiologia do câncer de mama em Roraima / The epidemiology of breast cancer in Roraima

Brazilian Journal of Health Review, 2020
O câncer de mama e um grande problema de saude publica, sendo o diagnostico na sua fase inicial de suma importância para um melhor prognostico e tratamento da mulher afetada. O presente estudo traz como objetivos tracar um perfil epidemiologico do câncer de mama, no Estado de Roraima entre os anos de 2009 a 2013, bem como verificar se a mamografia ...
de Luna, Ana Cecília Marques, Araújo, Alexia Mahara Marques, Cardenas, Bryan Giusseppe Jaramillo, Moreira, Adriana de Lima, Mendes, Ianara Fernanda de Lima, Tizolim, Marycassiely Rodrigues, Costa, Natalie Rebeca, de Almeida, Simone Lopes   +7 more
openaire   +3 more sources

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

The Economic and Ecological Impact of Soy in Brazil: A Synthetic Control Method Approach

Journal of Agricultural Economics, EarlyView.
ABSTRACT In recent decades, soy expansion in Brazil has generated significant environmental, social and economic impacts. However, there is no consensus about benefits and drawbacks, calling for a more careful account of the economic and ecological diversity of the territories where this phenomenon has been unfolding.
Stefano Ghinoi, Simone Piras, Luca Tasciotti, Valdemar João Wesz Junior   +3 more
wiley   +1 more source

Narcogarimpo: las afinidades electivas entre los frentes de minería ilegal y la expansión del narcotráfico en la Amazonía brasileira

Urvio
Este estudio lleva a cabo una interpretación sociohistórica de los frentes de minería ilegal y sus afinidades con los dos grupos criminales, Comando Vermelho (CV) y Primeiro Comando da Capital (PCC), que se expandieron violentamente desde Rio de Janeiro ...
Rodrigo Pereira Chagas
doaj   +1 more source

Predicting global habitat suitability and invasion risks of the red gum lerp psyllid Glycaspis brimblecombei under current and future climates

Agricultural and Forest Entomology, EarlyView.
Ecological niche modelling identified highly suitable habitats for Glycaspis brimblecombei across tropical, subtropical and temperate regions. Future climate projections indicate a moderate contraction of suitable areas, with persistence of core climatic suitability. Model performance was robust (AUC = 0.880; TSS = 0.634; CBI = 0.803), with temperature
Fernanda de Aguiar Coelho, George Corrêa Amaro, Adriene Caldeira Batista, Edmond Joseph Djibril Victor Barry, Muhammad Haseeb, Marcus Alvarenga Soares, Owusu Fordjour Aidoo, Sebastião Lourenço de Assis Júnior, Ricardo Siqueira da Silva   +8 more
wiley   +1 more source

Prevalence and Pattern of Refractive Errors Among Yanomami Indigenous People in the Brazilian Amazon: A Cross‐Sectional Observational Study

Clinical &Experimental Ophthalmology, EarlyView.
ABSTRACT Background Refractive errors are the leading cause of preventable visual impairment worldwide, yet data from isolated Indigenous populations remain virtually absent from the global literature. The Yanomami, one of the largest Indigenous peoples in the Americas with recent and limited contact with non‐Indigenous society, have no prior ...
Maria Christina Chagas Ferreira, Marcos Antonio Pellegrini, Bianca Jorge Sequeira   +2 more
wiley   +1 more source

EXPANSÃO DO TURISMO E REPRESENTAÇÕES GEOGRÁFICAS NOS CAMPOS DO RIO BRANCO, RORAIMA, AMAZÔNIA

Cadernos de Estudos Sociais, 1999
trabalho descreve e analisa como a recente expansão do ecoturismo na Amazônia, especialmente no Estado de Roraima, Brasil, tem recriado mitos, imagens e representações territoriais no sentido de oferecer produtos turísticos competitivos em nível ...
Nilson C. Crocia de Barros
doaj  

Scientists’ warning on the global destruction of rock outcrop ecosystems

Conservation Biology, EarlyView.
Abstract Rock outcrops are geological formations that harbor a highly specialized biota adapted to harsh environmental conditions that differ from their surrounding landscapes. They are globally distributed, especially in old, highly weathered landscapes, and can function as habitat islands containing high levels of endemism and distinct evolutionary ...
Luiza F. A. de Paula, Lucas N. Perillo, Gianluigi Ottaviani, Flávio F. Carmo, Mandar N. Datar, Katherine C. Enebeli‐Ekwutoziam, Bruno Fogliani, Stephen D. Hopper, Aboli Kulkarni, Hans Lambers, Rafael F. Magalhães, Frederico S. Neves, Jean‐François Ponge, Stefan Porembski, Bruno H. P. Rosado, Fernando M. G. Santos, Elycée Tindano, Bram Vanschoenwinkel, Aparna Watve, Fernando A. O. Silveira   +19 more
wiley   +1 more source