Results 41 to 50 of about 1,752 (180)

Rice Husk Ash Modified with Vanadium Pentoxide

Orbital: The Electronic Journal of Chemistry, 2017
Rice husk collected in Barreiras City, Bahia, Brazil was converted to rice husk ash (RHA) by acidic or basic leaching, followed by calcination. The resulting RHA was modified with vanadium pentoxide (2, 5, or 10 mass% of V2O5).
Isaias Alves Rodrigues, Stéfane Oliveira de Lira, Tiago dos Santos Estrela, Cailon França de Castro, Valdeilson Souza Braga   +4 more
doaj   +3 more sources

Integrative taxonomy reveals two new species of whiptail catfishes Loricaria (Siluriformes: Loricariidae) from northeastern Brazil

Journal of Fish Biology, EarlyView.
Abstract Two new species of whiptail catfish, Loricaria (Siluriformes: Loricariidae), were discovered in the Munim and Itapecuru river basins, Maranhão State, northeastern Brazil, through an integrative taxonomic approach combining morphology and mitochondrial DNA.
Ananda. C. Serejo‐Saraiva, Nivaldo M. Piorski, Felipe P. Ottoni, Mark H. Sabaj, Sergio M. Q. Lima   +4 more
wiley   +1 more source

Iron oxides in plinthic soils on sedimentary deposits in northeastern Brazil

Revista Brasileira de Ciência do Solo, 1999
This study was conducted to examine the distribution and nature of Fe oxides in plinthic soils on the sediments of Barreiras Group (in the state of Piauí) and Itapecuru Formation (in the state of Maranhão) in Northeastern Brazil.
R. J. Heck, A. R. Mermut, M. C. Santos
doaj   +1 more source

Sleep Health of Athletes of Different Sports: Translation and Validation of the Athlete Sleep Screening Questionnaire to Portuguese

Journal of Sleep Research, EarlyView.
ABSTRACT This study aimed to translate and validate the Athlete Sleep Screening Questionnaire (ASSQ) into Portuguese and assess the sleep health of athletes using the ASSQ. Translation followed established scientific guidelines. A sample of 246 Portuguese athletes from various sports completed the ASSQ, the Pittsburgh Sleep Quality Index (PSQI) and the
João Barreira, Júlio A. Costa, João Brito, Vasco Cardoso, Cátia Reis   +4 more
wiley   +1 more source

Hipsometria derivada de MDE-SRTM aplicada na distinção entre a Formação Barreiras e os Sedimentos Pós-Barreiras na Bacia Paraíba [PDF]

, 2011
Techniques such as geomorphometry provide important contribution to geological mapping, particularly when integrated with field data. In this paper, we used hypsometry extracted from digital elevation model derived from the Shuttle Radar Topography ...
Rossetti, Dilce de Fátima, Zani, Hiran, Andrades Filho, Clódis de Oliveira   +2 more
core  

Assessing the evolutionary distinctiveness of a highly threatened plant group: The urgency to preserve a unique lineage of evolution in Brazil

PLANTS, PEOPLE, PLANET, Volume 8, Issue 4, Page 1223-1237, July 2026.
Brazil's diverse flora is under several threats, with many unique lineages facing extinction, particularly in biodiverse regions like the Cerrado and campo rupestre. This study sheds light on the conservation needs of Cambessedesia (Melastomataceae), an endemic genus with 95% of its species endangered, using an approach to rank and prioritise species ...
Najla Bastos Scheidegger, Raquel C. Pizzardo, Bruno Vilela, Thuane Bochorny, Juliana Gastaldello Rando   +4 more
wiley   +1 more source

Balancing tracks and trees: Assessing railroad impact on Brazilian biodiversity

PLANTS, PEOPLE, PLANET, Volume 8, Issue 4, Page 1345-1356, July 2026.
The Brazilian West–East Integration Railway (FIOL) aims to boost the national economy by improving commodity transport; however, it crosses three of Brazil's most biodiverse and fragile regions: the Caatinga, Cerrado and Atlantic Forest. Using digitised plant records and land‐use analyses, our study reveals significant vegetation loss within the ...
Ana Luiza Silva Rocha, Anselmo Nogueira, Matheus Colli‐Silva, Juliana Gastaldello Rando   +3 more
wiley   +1 more source

Pedogenesis of Spodosols under environments of the Barreiras formation and sandbank on southern Bahia [PDF]

, 2007
Em áreas do Barreiras e de restinga do sul da Bahia é comum a ocorrência de Espodossolos muito diferenciados morfologicamente. No domínio dos sedimentos da Formação Barreiras dessa região é comum a observação de um ambiente edafologicamente diferenciado,
Oliveira, Aline Pacobahyba de
core  

Assinatura isotópica da Formação Barreiras na borda Leste da Bacia do Marajó e Plataforma Bragantina : fontes e implicações para a paleogeografia da Amazônia Oriental no Mioceno [PDF]

, 2021
Dissertação (mestrado)—Universidade de Brasília, Instituto de Geociências, Programa de Pós-Graduação em Geologia, 2021.Depósitos siliciclásticos do Mioceno Médio denominados litoestratigraficamente como Formação Barreiras são amplamente distribuídos em ...
Moizinho, Gabriel Ribeiro
core  

A mulher negra e a formação em Psicologia. Quais as barreiras existentes? [PDF]

, 2021
The present study is the result of a research that sought to verify whether the association between gender and race can interfere in the Psychology undergraduate of black women.
Emílio, Solange Aparecida, Santos, Aline Souza Rosa dos   +1 more
core   +2 more sources