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 | Acesso ao texto completo restrito à biblioteca da Embrapa Meio Ambiente. Para informações adicionais entre em contato com cnpma.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação; Embrapa Meio Ambiente. |
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Data corrente: |
13/01/2022 |
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Data da última atualização: |
03/02/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
CASTRO, V. L. S. S. de; JONSSON, C. M.; SILVA, M. S. G. M. e; CASTANHA, R. F.; VALLIM, J. H.; SILVA, L. A. G. da; OLIVEIRA, R. M. D. de; CORREA, D. S.; FERREIRA, M. D. |
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Afiliação: |
VERA LUCIA SCHERHOLZ S DE CASTRO, CNPMA; CLAUDIO MARTIN JONSSON, CNPMA; MARIANA SILVEIRA GUERRA MOURA E SILVA, CNPMA; RODRIGO FERNANDES CASTANHA, CNPMA; JOSE HENRIQUE VALLIM, CNPMA; LETÍCIA ALBERTI GALEGO DA SILVA; RAISSA MORET DUARTE DE OLIVEIRA, UFSCar; DANIEL SOUZA CORREA, CNPDIA; MARCOS DAVID FERREIRA, CNPDIA. |
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Título: |
Estimates of AgNP toxicity thresholds in support of environmental safety policies. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Journal of Nanoparticle Research, v. 24, n. 1, article 24, 2022. |
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ISSN: |
1572-896X |
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DOI: |
https://doi.org/10.1007/s11051-021-05357-4 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Silver nanoparticles (AgNPs) currently possess widespread applications in many products. Although there is an increase in the evaluation of their potential environmental risks and toxicity, the data available on AgNP safety levels are limited. Studies on the ecotoxicological and environmental risks of AgNPs, then, are still a requirement. In the present study, AgNPs sized at 82.8 nm were synthetized with an aim to assess their effect on some organisms including algae, plants, microcrustaceans, cnidaria, nematodes, aquatic insects, earthworms, and fish embryos. In addition, some ecotoxicity data obtained from the literature were also used. The non-observed-effect concentration (NOEC) was then calculated for each organism using a log-logistic function. Additionally, the stability of AgNPs in contact with the culture media throughout the analyzed period and conditions employed was evaluated in order to ensure their availability for the organisms tested. The AgNPs remained stable, presenting a dispersion rate of less than 20%, except for the A. salina medium, which presented a dispersion of approximately 25% but did not display differences in AgNP size. The predicted no-effect concentration (PNEC) in the aquatic and sediment compartment was estimated to lie in a concentration range from 0.07 to 0.35 µg Lâ??1. A risk quotient (RQ) of 28.6 was derived for the NPs tested in relation to a maximum AgNP predicted environmental concentration (PEC) estimate. Since an RQ value superior to 1 indicates an occurrence of risk and, consequently, the need for management measures to be implemented, the present data, in conjunction with the expected increase in AgNP use, reinforce the importance of the establishment of AgNP safety levels that can contribute to AgNP risk assessment studies. MenosAbstract: Silver nanoparticles (AgNPs) currently possess widespread applications in many products. Although there is an increase in the evaluation of their potential environmental risks and toxicity, the data available on AgNP safety levels are limited. Studies on the ecotoxicological and environmental risks of AgNPs, then, are still a requirement. In the present study, AgNPs sized at 82.8 nm were synthetized with an aim to assess their effect on some organisms including algae, plants, microcrustaceans, cnidaria, nematodes, aquatic insects, earthworms, and fish embryos. In addition, some ecotoxicity data obtained from the literature were also used. The non-observed-effect concentration (NOEC) was then calculated for each organism using a log-logistic function. Additionally, the stability of AgNPs in contact with the culture media throughout the analyzed period and conditions employed was evaluated in order to ensure their availability for the organisms tested. The AgNPs remained stable, presenting a dispersion rate of less than 20%, except for the A. salina medium, which presented a dispersion of approximately 25% but did not display differences in AgNP size. The predicted no-effect concentration (PNEC) in the aquatic and sediment compartment was estimated to lie in a concentration range from 0.07 to 0.35 µg Lâ??1. A risk quotient (RQ) of 28.6 was derived for the NPs tested in relation to a maximum AgNP predicted environmental concentration (PEC) estimate. Since an RQ val... Mostrar Tudo |
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Palavras-Chave: |
Nanopartículas de prata. |
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Thesagro: |
Alga; Composto Químico; Crustáceo; Impacto Ambiental; Inseto; Nematóide; Planta; Toxidez. |
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Thesaurus Nal: |
Ecotoxicology; Environmental impact; Nanomaterials; Nanoparticles; Risk assessment; Silver compounds. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 03020naa a2200421 a 4500
001 2139069
005 2023-02-03
008 2022 bl uuuu u00u1 u #d
022 $a1572-896X
024 7 $ahttps://doi.org/10.1007/s11051-021-05357-4$2DOI
100 1 $aCASTRO, V. L. S. S. de
245 $aEstimates of AgNP toxicity thresholds in support of environmental safety policies.$h[electronic resource]
260 $c2022
520 $aAbstract: Silver nanoparticles (AgNPs) currently possess widespread applications in many products. Although there is an increase in the evaluation of their potential environmental risks and toxicity, the data available on AgNP safety levels are limited. Studies on the ecotoxicological and environmental risks of AgNPs, then, are still a requirement. In the present study, AgNPs sized at 82.8 nm were synthetized with an aim to assess their effect on some organisms including algae, plants, microcrustaceans, cnidaria, nematodes, aquatic insects, earthworms, and fish embryos. In addition, some ecotoxicity data obtained from the literature were also used. The non-observed-effect concentration (NOEC) was then calculated for each organism using a log-logistic function. Additionally, the stability of AgNPs in contact with the culture media throughout the analyzed period and conditions employed was evaluated in order to ensure their availability for the organisms tested. The AgNPs remained stable, presenting a dispersion rate of less than 20%, except for the A. salina medium, which presented a dispersion of approximately 25% but did not display differences in AgNP size. The predicted no-effect concentration (PNEC) in the aquatic and sediment compartment was estimated to lie in a concentration range from 0.07 to 0.35 µg Lâ??1. A risk quotient (RQ) of 28.6 was derived for the NPs tested in relation to a maximum AgNP predicted environmental concentration (PEC) estimate. Since an RQ value superior to 1 indicates an occurrence of risk and, consequently, the need for management measures to be implemented, the present data, in conjunction with the expected increase in AgNP use, reinforce the importance of the establishment of AgNP safety levels that can contribute to AgNP risk assessment studies.
650 $aEcotoxicology
650 $aEnvironmental impact
650 $aNanomaterials
650 $aNanoparticles
650 $aRisk assessment
650 $aSilver compounds
650 $aAlga
650 $aComposto Químico
650 $aCrustáceo
650 $aImpacto Ambiental
650 $aInseto
650 $aNematóide
650 $aPlanta
650 $aToxidez
653 $aNanopartículas de prata
700 1 $aJONSSON, C. M.
700 1 $aSILVA, M. S. G. M. e
700 1 $aCASTANHA, R. F.
700 1 $aVALLIM, J. H.
700 1 $aSILVA, L. A. G. da
700 1 $aOLIVEIRA, R. M. D. de
700 1 $aCORREA, D. S.
700 1 $aFERREIRA, M. D.
773 $tJournal of Nanoparticle Research$gv. 24, n. 1, article 24, 2022.
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Registro original: |
Embrapa Meio Ambiente (CNPMA) |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Semiárido. Para informações adicionais entre em contato com cpatsa.biblioteca@embrapa.br. |
Registro Completo
|
Biblioteca(s): |
Embrapa Semiárido. |
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Data corrente: |
20/08/2021 |
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Data da última atualização: |
20/08/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
DIAS, M. A. M.; BOMFIM, C. S. G.; RODRIGUES, D. R.; SILVA, A. F. da; SANTOS, J. C. S.; NASCIMENTO, T. R. do; MARTINS, L. M. V.; DANTAS, B. F.; RIBEIRO, P. R. de A.; FREITAS, A. D. S. de; FERNANDES JUNIOR, P. I. |
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Afiliação: |
MARCOS ANDRÉ MOURA DIAS, UNIVASF; CLAUDIA SILVA GOMES BOMFIM; DALILA RIBEIRO RODRIGUES, UEPB; ALEKSANDRO FERREIRA DA SILVA, UFRPE; JÉSSICA CAROLINE SOUZA SANTOS, UPE; TAILANE RIBEIRO DO NASCIMENTO, UNEB; LINDETE MÍRIA VIEIRA MARTINS, UNEB; BARBARA FRANCA DANTAS, CPATSA; PAULA ROSE DE ALMEIDA RIBEIRO; ANA DOLORES SANTIAGO DE FREITAS, UFRPE; PAULO IVAN FERNANDES JUNIOR, CPATSA. |
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Título: |
Paraburkholderia spp. are the main rhizobial microsymbionts of Mimosa tenuiflora (Willd.) Poir. in soils of the Brazilian tropical dry forests (Caatinga biome). |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Systematic and Applied Microbiology, v. 44, 2021. |
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DOI: |
https://doi.org/10.1016/j.syapm.2021.126208 |
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Idioma: |
Inglês |
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Conteúdo: |
Mimosa tenuiflora (Willd.) Poir. is widespread in southern and central American drylands, but little information is available concerning its associated rhizobia. Therefore, this study aimed to characterize M. tenuiflora rhizobia from soils of the tropical dry forests (Caatinga) in Pernambuco State, Brazil, at the molecular and symbiotic levels. Soil samples of pristine Caatinga areas in four municipalities were used to grow M. tenuiflora. First, the bacteria from root nodules were subjected to nodC/nifH gene amplification, and the bacteria positive for both genes had the 16S rRNA gene sequenced. Then, ten strains were evaluated using recA, gyrB, and nodC gene sequences, and seven of them had their symbiotic efficiency assessed. Thirty-two strains were obtained and 22 of them were nodC/nifH positive. Twenty strains clustered within Paraburkholderia and two within Rhizobium by 16S rRNA gene sequencing. The beta-rhizobia were similar to P. phenoliruptrix (12) and P. diazotrophica (8). Both alpha-rhizobia were closely related to R. miluonense. The recA + gyrB phylogenetic analysis clustered four and five strains within the P. phenoliruptrix and P. diazotrophica branches, respectively, but they were somewhat divergent to the 16S rRNA phylogeny. For Rhizobium sp. ESA 637, the recA + gyrB phylogeny clustered the strain with R. jaguaris. The nodC phylogeny indicated that ESA 626, ESA 629, and ESA 630 probably represented a new symbiovar branch. The inoculation assay showed high symbiotic efficiency for all tested strains. The results indicated high genetic diversity and efficiency of M. tenuiflora rhizobia in Brazilian drylands and included P. phenoliruptrix-like bacteria in the list of efficient beta-rhizobia in the Caatinga biome. MenosMimosa tenuiflora (Willd.) Poir. is widespread in southern and central American drylands, but little information is available concerning its associated rhizobia. Therefore, this study aimed to characterize M. tenuiflora rhizobia from soils of the tropical dry forests (Caatinga) in Pernambuco State, Brazil, at the molecular and symbiotic levels. Soil samples of pristine Caatinga areas in four municipalities were used to grow M. tenuiflora. First, the bacteria from root nodules were subjected to nodC/nifH gene amplification, and the bacteria positive for both genes had the 16S rRNA gene sequenced. Then, ten strains were evaluated using recA, gyrB, and nodC gene sequences, and seven of them had their symbiotic efficiency assessed. Thirty-two strains were obtained and 22 of them were nodC/nifH positive. Twenty strains clustered within Paraburkholderia and two within Rhizobium by 16S rRNA gene sequencing. The beta-rhizobia were similar to P. phenoliruptrix (12) and P. diazotrophica (8). Both alpha-rhizobia were closely related to R. miluonense. The recA + gyrB phylogenetic analysis clustered four and five strains within the P. phenoliruptrix and P. diazotrophica branches, respectively, but they were somewhat divergent to the 16S rRNA phylogeny. For Rhizobium sp. ESA 637, the recA + gyrB phylogeny clustered the strain with R. jaguaris. The nodC phylogeny indicated that ESA 626, ESA 629, and ESA 630 probably represented a new symbiovar branch. The inoculation assay showed high symb... Mostrar Tudo |
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Palavras-Chave: |
Bioma Caatinga; Fixação biológica de nitrogênio; Região semiárida brasileira; Rizobio. |
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Thesagro: |
Caatinga; Floresta Tropical; Inoculante; Solo. |
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Thesaurus NAL: |
Soil. |
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Categoria do assunto: |
G Melhoramento Genético |
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Marc: |
LEADER 02903naa a2200361 a 4500
001 2133773
005 2021-08-20
008 2021 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.syapm.2021.126208$2DOI
100 1 $aDIAS, M. A. M.
245 $aParaburkholderia spp. are the main rhizobial microsymbionts of Mimosa tenuiflora (Willd.) Poir. in soils of the Brazilian tropical dry forests (Caatinga biome).$h[electronic resource]
260 $c2021
520 $aMimosa tenuiflora (Willd.) Poir. is widespread in southern and central American drylands, but little information is available concerning its associated rhizobia. Therefore, this study aimed to characterize M. tenuiflora rhizobia from soils of the tropical dry forests (Caatinga) in Pernambuco State, Brazil, at the molecular and symbiotic levels. Soil samples of pristine Caatinga areas in four municipalities were used to grow M. tenuiflora. First, the bacteria from root nodules were subjected to nodC/nifH gene amplification, and the bacteria positive for both genes had the 16S rRNA gene sequenced. Then, ten strains were evaluated using recA, gyrB, and nodC gene sequences, and seven of them had their symbiotic efficiency assessed. Thirty-two strains were obtained and 22 of them were nodC/nifH positive. Twenty strains clustered within Paraburkholderia and two within Rhizobium by 16S rRNA gene sequencing. The beta-rhizobia were similar to P. phenoliruptrix (12) and P. diazotrophica (8). Both alpha-rhizobia were closely related to R. miluonense. The recA + gyrB phylogenetic analysis clustered four and five strains within the P. phenoliruptrix and P. diazotrophica branches, respectively, but they were somewhat divergent to the 16S rRNA phylogeny. For Rhizobium sp. ESA 637, the recA + gyrB phylogeny clustered the strain with R. jaguaris. The nodC phylogeny indicated that ESA 626, ESA 629, and ESA 630 probably represented a new symbiovar branch. The inoculation assay showed high symbiotic efficiency for all tested strains. The results indicated high genetic diversity and efficiency of M. tenuiflora rhizobia in Brazilian drylands and included P. phenoliruptrix-like bacteria in the list of efficient beta-rhizobia in the Caatinga biome.
650 $aSoil
650 $aCaatinga
650 $aFloresta Tropical
650 $aInoculante
650 $aSolo
653 $aBioma Caatinga
653 $aFixação biológica de nitrogênio
653 $aRegião semiárida brasileira
653 $aRizobio
700 1 $aBOMFIM, C. S. G.
700 1 $aRODRIGUES, D. R.
700 1 $aSILVA, A. F. da
700 1 $aSANTOS, J. C. S.
700 1 $aNASCIMENTO, T. R. do
700 1 $aMARTINS, L. M. V.
700 1 $aDANTAS, B. F.
700 1 $aRIBEIRO, P. R. de A.
700 1 $aFREITAS, A. D. S. de
700 1 $aFERNANDES JUNIOR, P. I.
773 $tSystematic and Applied Microbiology$gv. 44, 2021.
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