|
|
|
|
|
| Silva,Ygor Jacques Agra Bezerra da; Nascimento,Clístenes Williams Araújo do; Silva,Yuri Jacques Agra Bezerra da; Biondi,Caroline Miranda; Silva,Cinthia Maria Cordeiro Atanázio Cruz. |
| ABSTRACT: Studies regarding background concentrations of rare earth elements (REEs) are scarce and have mainly focused on a limited number of soil types from the northern hemisphere. The aim of this study was to determine REE concentrations in thirty-five benchmark soils of Brazil. Composite soil samples were taken from areas under native vegetation or with minimal anthropogenic influence. Concentrations of La, Ce, Pr, Nd, Sm, Eu, Gd, Yb, Lu, Dy, Er, Ho, Tb, Tm, Y, Sc, and Fe were determined by ICP-OES using a cyclonic spray chamber/nebulizer system after microwave acid digestion. Results were assessed by descriptive statistics, Pearson correlation, and principal component analysis (PCA). Regression analyses among Fe, organic carbon, and REEs were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lanthanides; Scandium; Yttrium; Metals; Trace elements. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100548 |
| |
|
| |
|
|
| Silva,Yuri Jacques Agra Bezerra da; Oliveira,Eliabe Barros de; Silva,Ygor Jacques Agra Bezerra da; Nascimento,Clístenes Williams Araújo do; Silva,Tatiana dos Santos; Boechat,Cácio Luiz; Teixeira,Marcos Paulo Rodrigues; Barbosa,Ronny Sobreira; Singh,Vijay P.; Sena,Antonny Francisco Sampaio de. |
| ABSTRACT: Environmental impacts caused by the addition of rare earth elements (REEs) to agricultural soils are a growing concern. The sedimentary basin of the Gurguéia River is located in one of the last agricultural frontiers in Brazil; nevertheless, data regarding quality reference values (QRVs) for REEs in soils are still scarce. The objective of this study was therefore to determine the natural concentration and establish the QRVs of REEs in soils of Gurguéia watershed, Brazil. Fifty-five composite soil samples were collected at sites under no or minimal anthropic interference. The average REE natural concentrations in soils from the Gurguéia watershed were lower than those found in other regions of Brazil and worldwide, following the order (mg kg−1):... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: REE geochemistry; Gurguéia watershed; Oxisols; Lanthanides. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000701401 |
| |
|
|
| Roy,René; Shiao,Tze Chieh; Rittenhouse-Olson,Kate. |
| Combining nanotechnology with glycobiology has triggered an exponential growth of research activities in the design of novel functional bionanomaterials (glyconanotechnology). More specifically, recent synthetic advances towards the tailored and versatile design of glycosylated nanoparticles namely glyconanoparticles, considered as synthetic mimetics of natural glycoconjugates, paved the way toward diverse biomedical applications. The accessibility of a wide variety of these structured nanosystems, in terms of shapes, sizes, and organized around stable nanoparticles have readily contributed to their development and applications in nanomedicine. In this context, glycosylated gold-nanoparticles (GNPs), glycosylated quantum dots (QDs), fullerenes, single-wall... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dendrimer; Glycodendrimer; Vaccine; Bacteria; Nanoparticles; E. coli; Lanthanides. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502013000700008 |
| |
|
|
|
