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Registros recuperados: 5
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Effects of graphene oxide on aquatic macrophyte under the influence of humic substances. Repositório Alice
JONSSON, C. M.; CLEMENTE, Z.; CASTRO, V. L. S. S. de; CASTANHA, R. F.; VALLIM, J. H.; DOMINGOS, N.; BLUMEL, S..
The behavior of nanostructured graphene oxide (GO) in the environment is complex and must be completely understood to evaluate the risk involved. Studies show that humic acid (HA) can stabilize nanomaterials in water and change its behavior. The aquatic macrophyte duckweed (Lemna minor) is a good plant model for adverse effects evaluation of many test-materials due to its fast growth and small size. This study assessed the effect of GO, with and without HA, on the growth of L. minor on fronds number and biomass changes. The plants were exposed during 7 days to the nominal concentrations of GO equals to 0.0 (control), 0.1, 1.0, 10.0 and 100.0 mg L-1, in the absence or in the presence of 20 mg L-1 of HA. Tests were conducted in multiwell polystyreneplates...
Tipo: Separatas Palavras-chave: Macrophytes; Graphene.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1068118
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Evaluating the graphene oxide dispersions for fish embryo toxicity (FET) test. Repositório Alice
CLEMENTE, Z.; CASTRO, V. L. S. S. de; FRANQUI, L.; SILVA, C. A.; MARTINEZ, D. S. T..
The Fish Embryo Toxicity (FET) test has wide utilization in nanoecotoxicology. However, some difficulties have been found related to the aggregation and precipitation of nanomaterials in exposure medium and the contrasting results among studies due to differences in the material characteristics. Furthermore, abiotic factors as the presence of organic matter can influence the test evaluation. The aim of this study was to evaluate and characterize the effect of the humic acid presence in the stability of two types of graphene oxide dispersion in an exposure medium used in FET test. Stock-suspensions (1.0 mg mL-1) of GO (sigma Aldrich, flakes) or base-washed GO (bwGO) and humic acid (HA sodium salt, Sigma Aldrich) were prepared in ultrapure water (UW). They...
Tipo: Separatas Palavras-chave: FET test; Ecotoxicologia.; Peixe.; Graphene.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1068204
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Graphene: A new technology for agriculture. Repositório Alice
MAY, A.; COELHO, L. F.; SILVA, E. H. F. M. da; VIANA, R. da S.; VIEIRA JUNIOR, N. A.; FERREIRA, W. P. M..
Abstract: This article presents a review on the use of graphene in various segments, elucidating that this product can be used in various industrial sectors. These include mainly agriculture (as in large crops of high relevance, such as coffee), the food industry and the environment, as a plant growth stimulator and in fertilizers, nanoencapsulation and smart-release systems, antifungal and antibacterial agents, smart packaging, water treatment and ultrafiltration, contaminant removal, pesticide and insecticide quantitation, detection systems and precision agriculture. However, some challenges can be overcome before the graphene-based nanoparticle is used on a large scale. In this way, before using the product in the environment, it is necessary to...
Tipo: Artigo de periódico Palavras-chave: Grafeno; Óxido de grafeno; Nanomateriais; Composto de Carbono; Agricultura; Graphene oxide; Graphene; Agriculture; Nanomaterials; Carbon.
Ano: 2021 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1131378
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Graphene oxide toxicological effects on daphnia and hydra. Repositório Alice
CASTRO, V. L. S. S. de; CLEMENTE, Z.; MARTINEZ, D. S.; JONSSON, C. M.; VALLIM, J. H.; BLUMEL, S..
The increased use of nanomaterials products requires robust strategies to identify risks when they are released into the environment. Graphene and its derivatives are promising candidates for biomedical applications and as potential advanced water purification agents. However, little is known about their ecotoxicological risks. Aquatic toxicity tests are performed with different aquatic organisms as daphnia and hydra in order to evaluate the risks resulting from the presence of graphene oxide (GO) in the environment. The following GO concentrations were tested: 0, 1, 10 and 100 mg.L-1. Acute toxicity to D. magna was evaluated in a period of 48 hours when was recorded the number of moving subjects in order to determine the CE5024h and CE5048h (n = 24 /...
Tipo: Separatas Palavras-chave: Ecotoxicologia.; Graphene; Daphnia; Hydra.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1068126
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Interlab study on nanotoxicology of representative graphene oxide. Repositório Alice
DURÁN, N.; MARTINEZ, D. S. T.; JUSTO, G. Z.; LIMA, R.; CASTRO, V. L. S. S. de; UMBUZEIRO, G. A.; BARBIERI, E.; DURÁN, M.; MELO, P. S.; ALVES, O. L..
Tipo: Separatas Palavras-chave: Nanotoxicology; Graphene.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1010897
Registros recuperados: 5
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