Results 21 to 30 of about 2,812 (171)

Evaporitos como recursos minerais [PDF]

Revista Brasileira de Geofísica, 2000
Evaporites are sedimentary rocks commonly formed in sedimentary environments of low terrigenous input, under arid climate where the evaporation rates are high enough for the formation of brines from which the evaporitic sediments are generated. The economic potential of these rocks is enormous, and halite, the commonly consumed salt, is one of the most
Silva, Maria A. M. da, Schreiber, B. Charlotte, Santos, Carla L. dos   +2 more
openaire   +3 more sources

Hydrophysical Database for Brazilian Soils (HYBRAS) and Pedotransfer Functions for Water Retention

Vadose Zone Journal, Volume 17, Issue 1, Page 1-17, 2018., 2018
Core Ideas We propose a Hydrophysical Database for Brazilian Soils (HYBRAS). Data in HYBRAS comprise 445 soil profiles, with 1075 samples of Brazilian soils. We compared the accuracy of water retention estimates based on climate‐based PTFs. In general, the Brazilian PTFs performed better than the temperate models for HYBRAS.
Marta Vasconcelos Ottoni, Theophilo Benedicto Ottoni Filho, Marcel G. Schaap, Maria Leonor R.C. Lopes-Assad, Otto Corrêa Rotunno Filho   +4 more
wiley   +1 more source

Massive Submandibular Sialolith: Complete Radiographic Registration and Biochemical Analysis through X‐Ray Diffraction

Case Reports in Surgery, Volume 2014, Issue 1, 2014., 2014
Sialolithiasis is a pathologic condition that affects 60 million people per year, which is caused by the presence of calcified structures, named sialoliths, inside the salivary glands and their salivary ducts. Despite the large incidence of sialolithiasis, its etiology is still unknown.
Ademir Franco, Mayara Jessica de Carvalho Mattos, Francine Ferrari, José Manoel dos Reis Neto, Luiz Carlos Carta Gambus, Paulo Henrique Couto Souza, Soraya de Azambuja Berti-Couto, David J. Bentrem   +7 more
wiley   +1 more source

Confirming the impact origin of the São Miguel do Tapuio structure, northeastern Brazil

Meteoritics &Planetary Science, Volume 61, Issue 7, Page 1263-1287, July 2026.
Abstract The São Miguel do Tapuio structure (SMT) is a remarkable, nearcircular feature of about 21 km diameter, centered at 5°37.6′ S, 41°23.3′ W in Piauí state, northeastern Brazil. The structure is located within the sedimentary strata of the Paleozoic–Mesozoic Parnaíba Basin and predominantly comprises sandstones of the Devonian Pimenteiras and ...
Alvaro Penteado Crósta, Neivaldo Araújo de Castro, Marcos Alberto Rodrigues Vasconcelos, Airton Natanael Coelho Dias, Ludovic Ferrière, Wolf Uwe Reimold, Ana Maria Góes, Jackson Alves Martins, Liliana Sayuri Osako, Raimundo Mariano Gomes Castelo Branco   +9 more
wiley   +1 more source

Molecular Characterization of TP53 Gene in Human Populations Exposed to Low‐Dose Ionizing Radiation

BioMed Research International, Volume 2013, Issue 1, 2013., 2013
Ionizing radiation, such as that emitted by uranium, may cause mutations and consequently lead to neoplasia in human cells. The TP53 gene acts to maintain genomic integrity and constitutes an important biomarker of susceptibility. The present study investigated the main alterations observed in exons 4, 5, 6, 7, and 8 of the TP53 gene and adjacent ...
Igor Brasil-Costa, Dayse O. Alencar, Milene Raiol-Moraes, Igor A. Pessoa, Alexandre W. M. Brito, Schneyder R. Jati, Sidney E. B. Santos, Rommel M. R. Burbano, Ândrea K. C. Ribeiro-dos-Santos, Thomas Liehr   +9 more
wiley   +1 more source

Estimation of recharge of the Guarani Aquifer system based on the application of the water-table fluctuation method in the Ibicui River-RS

Revista Águas Subterrâneas, 2017
The estimation of groundwater recharge is determinant for the sustainable groundwater management. The recharge can be estimated using different methods according to the characteristics of the studied area, the spatial and temporal scales and data ...
Flora Würth Simon, Pedro Antonio Roehe Reginato, Roberto Eduardo Kirchheim, Guilherme Casarotto Troian   +3 more
doaj   +1 more source

Recursos minerais do Brasil

Terrae Didatica, 2021
Esta revisão objetiva elaborar diretrizes para aumentar a atratividade de investimentos no setor mineral brasileiro. Fundamenta-se em pesquisa bibliográfica e documental, consultas a diversas órgãos de governo e instituições privadas, visando diagnosticar a situação atual, diante das potencialidades e deficiências.
Cassio Roberto da Silva, Ricardo Guimarães de Azevedo   +1 more
openaire   +1 more source

Síntese e caracterização de compósito magnético nanoestruturado contendo óxido de manganês para remoção de íons Cd(II) do meio aquoso

Cerâmica, 2014
O tratamento de efluentes contendo cádmio é de grande interesse devido à persistência desse contaminante no meio ambiente e às graves doenças que pode causar ao homem.
A. P. Heitmann, G. C. Silva, P. R. P. Paiva, A. M. Ferreira   +3 more
doaj   +1 more source

The Stability of Manganese Oxides Under Laser Irradiation During Raman Analyses: II. Layer Structures

Journal of Raman Spectroscopy, Volume 56, Issue 10, Page 1072-1088, October 2025.
Manganese oxides are important geomaterials with diverse technological applications. Here, we investigate the behaviour of the most common Mn oxides with layer structures under irradiation by a 532‐nm laser, with intensity ranging from 23 µW/µm2 to 36.8 mW/µm2.
Simone Bernardini, Giancarlo Della Ventura, Luigi Jovane, Armida Sodo, Boriana Mihailova   +4 more
wiley   +1 more source

Geocronologia Pb/Pb de zircões detríticos e análise estratigráfica das coberturas sedimentares proterozóicas do Sudoeste do Cráton Amazônico

Geologia USP. Série Científica, 2003
A análise estratigráfica e dados radiométricos obtidos pelo método Pb/Pb de evaporação em zircões detríticos das coberturas proterozóicas do sudoeste do Cráton Amazônico conduziu ao reconhecimento de duas seqüências deposicionais principais limitadas por
Jayme Alfredo Dexheimer Leite, Gerson Souza Saes   +1 more
doaj   +1 more source