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Epipelon responses to N and P enrichment and the relationships with phytoplankton and zooplankton in a mesotrophic reservoir
(2019-06-15)
The phototrophic epipelon has been suggested to play an important role in ecosystems, especially those with shallow depths; however, only a few studies have investigated this function. Nutrient availability has been shown ...
El enriquecimiento por intromisión en el derecho brasileño: propuesta de calificación como enriquecimiento injustificado
(Departamento de Derecho Civil, 2020-12-01)
Este estudio se propone elaborar una propuesta de calificación dogmática del enriquecimiento por intromisión, en el derecho civil brasileño, a partir de la delimitación de las fronteras entre la responsabilidad civil y la ...
Efeito do enriquecimento de nutrientes na biomassa fitoplanctônica no reservatório Boqueirão de Parelhas/RN
(Universidade Federal do Rio Grande do NorteBrasilUFRNEngenharia Ambiental, 2019-11-11)
Over the years, aquatic ecosystems has been significantly altered due to the multiple environmental impacts of anthropogenic activities. Excessive nutrient enrichment (N and P) and the consequent increase in primary ...
REE profiling in basic volcanic rocks after ultrasonic sample treatment and ICPMS analysis with oxide ion formation in ICP enriched with O2
(Elsevier Science, 2017-01)
ICP-MS methods, and its variants, had been extensively used to determine REEs due to their lower detection limits, high sensitivity and dynamic linear range. However, spectral interferences caused by oxide and hydroxide ...
Determinação de elementos do grupo da platina em carvão com alto teor de cinzas por ICP-MS
(Universidade Federal de Santa MariaBrasilQuímicaUFSMPrograma de Pós-Graduação em QuímicaCentro de Ciências Naturais e Exatas, 2017-06-03)
In this work a method for the digestion of high ash content coal (>30%) using a high
pressure asher (HPA) system for further determination of platinum group elements
(PGEs) by inductively coupled plasma mass spectrometry ...
On-line preconcentration system for nickel determination in food samples by flame atomic absorption spectrometry
(2001)
An on-line preconcentration system for nickel determination in natural foods has been developed. In it nickel(II) ions are fixed on a minicolumn packed with Amberlite XAD-2 loaded with 2-(2-benzothiazolylazo)-2-p-cresol ...
On-line preconcentration system for lead determination in seafood samples by flame atomic absorption spectrometry using polyurethane foam loaded with 2-(2-benzothiazolylazo)-2-p-cresol
(2001)
In the present paper, an on-line system for enrichment and determination of lead is proposed. It is based on the chemical sorption of lead(II) ions on a minicolumn packed with polyurethane foam loaded with 2-(2-benzothia ...
A sequência portadora de formações ferríferas de Guanhães, Minas Gerais, Brasil
(Universidade Federal de Minas GeraisUFMG, 2016-01-08)
The BIF-bearing supracrustal sequence of Guanhães is a Rhyacian metasedimentary sequence that occurs as thin tectonic slices superposed to Archean TTG granite-gneissic basement rocks developed probably at the Proterozoic-Paleozoic ...
Tolerance strategies of Atriplex atacamensis and A. halimus in response to multiple abiotic stressesEstrategias de tolerancia de Atriplex atacamensis y A. halimus en respuesta a múltiples estresores abióticos
(2019)
Copper enrichment can heavily restrict community development due to soil toxicity. In this situation, reclamation alternatives consider the use of metal-tolerant plants, but co-occurring abiotic soil restrictions, such as ...
Roles of flavonoids against coronavirus infection
In terms of public health, the 21st century has been characterized by coronavirus pandemics: in
2002-03 the virus SARS-CoV caused SARS; in 2012 MERS-CoV emerged and in 2019 a new
human betacoronavirus strain, called ...