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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
12/07/1999 |
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Data da última atualização: |
05/07/2018 |
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Autoria: |
NUNES, V. da S. |
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Afiliação: |
VÂNIA DA SILVA NUNES, CPAP. |
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Título: |
The biodegradation and toxicity of aromatic and halogenated aliphatic hydrocarbons. |
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Ano de publicação: |
1996 |
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Fonte/Imprenta: |
Las Cruces, New Mexico: New Mexico State University, 1996. |
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Páginas: |
125 p.il. |
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Idioma: |
Inglês |
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Notas: |
Ph.D. Thesis. |
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Conteúdo: |
Three hypotheses were tested in this study relating microbial biodegradation activity to changes in toxicological properties. The hypotheses were 1) The biodegradability of a given pollutant in a binary pollutant sample may be different from its biodegradability alone, because there might be a synergistic or antagonistic effect between the pollutants since different classes of pollutants have different degradation pathways and may have different effects on the biodegrading microbes; 2) Using a Ceriodaphnia dubia toxicity bioassay, the toxicity of a given pollutant in a binary pollutant sample may be different from its toxicity alone, bacause of concentration addition, synergism or antagonism effects; 3) The toxicity of the biodegradation products is different from that of the parent pollutant because biodegradation reactions break intramolecular bonds of organic pollutants, changing their properties. In most cases, biodegradation of both benzene and toluene occurred within the first week, though toluene biodegradation was more consistent. Benzene exerted and antagonistic effect on the degradation of toluene, because toluene degraded faster when alone than in the presence of benzene. The presence of chloroform or toluene did not exert any effect on benzene degradation. Similar compounds at the same concentration (i.e., benzene 10 ppm and toluene 10 ppm) had an additive toxicity interaction effect on C. dubia. That is, the combined toxicity effect of both was equal to the sum of the effect of each alone. Toluene was more toxic than benzene. Dissimilar compounds at the same concentration (i.e., benzene 10 ppm and chloroform 10 ppm) also had an additive toxicity interaction effect and benzene and chloroform had similar toxicities. The toxicity to toluene was significantly reduced after toluene degradation. The percentage of dead C. dubia for toluene treatments was 88% before biodegradation and 33% afterwards. On the other hand, the percentage of dead C. dubia for benzene was 33% before biodegradation and 24% afterwards. Thus, toxicity decreased only slightly after biodegradation in the case of benzene. In both cases, residual toxicity after biodegradation was presente. I suggest that bioremediation technologies incorporate routinely the use of bioassays for contaminated site clean-up. MenosThree hypotheses were tested in this study relating microbial biodegradation activity to changes in toxicological properties. The hypotheses were 1) The biodegradability of a given pollutant in a binary pollutant sample may be different from its biodegradability alone, because there might be a synergistic or antagonistic effect between the pollutants since different classes of pollutants have different degradation pathways and may have different effects on the biodegrading microbes; 2) Using a Ceriodaphnia dubia toxicity bioassay, the toxicity of a given pollutant in a binary pollutant sample may be different from its toxicity alone, bacause of concentration addition, synergism or antagonism effects; 3) The toxicity of the biodegradation products is different from that of the parent pollutant because biodegradation reactions break intramolecular bonds of organic pollutants, changing their properties. In most cases, biodegradation of both benzene and toluene occurred within the first week, though toluene biodegradation was more consistent. Benzene exerted and antagonistic effect on the degradation of toluene, because toluene degraded faster when alone than in the presence of benzene. The presence of chloroform or toluene did not exert any effect on benzene degradation. Similar compounds at the same concentration (i.e., benzene 10 ppm and toluene 10 ppm) had an additive toxicity interaction effect on C. dubia. That is, the combined toxicity effect of both was equal to the sum ... Mostrar Tudo |
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Palavras-Chave: |
Benzeno; Cloroformio; Tolueno. |
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Thesagro: |
Biodegradação; Ecologia; Poluente; Toxicologia. |
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Thesaurus Nal: |
benzene; biodegradation; chloroform; ecology; pollutants; toluene; toxicology. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03092nam a2200301 a 4500
001 1797671
005 2018-07-05
008 1996 bl uuuu m 00u1 u #d
100 1 $aNUNES, V. da S.
245 $aThe biodegradation and toxicity of aromatic and halogenated aliphatic hydrocarbons.
260 $aLas Cruces, New Mexico: New Mexico State University$c1996
300 $a125 p.il.
500 $aPh.D. Thesis.
520 $aThree hypotheses were tested in this study relating microbial biodegradation activity to changes in toxicological properties. The hypotheses were 1) The biodegradability of a given pollutant in a binary pollutant sample may be different from its biodegradability alone, because there might be a synergistic or antagonistic effect between the pollutants since different classes of pollutants have different degradation pathways and may have different effects on the biodegrading microbes; 2) Using a Ceriodaphnia dubia toxicity bioassay, the toxicity of a given pollutant in a binary pollutant sample may be different from its toxicity alone, bacause of concentration addition, synergism or antagonism effects; 3) The toxicity of the biodegradation products is different from that of the parent pollutant because biodegradation reactions break intramolecular bonds of organic pollutants, changing their properties. In most cases, biodegradation of both benzene and toluene occurred within the first week, though toluene biodegradation was more consistent. Benzene exerted and antagonistic effect on the degradation of toluene, because toluene degraded faster when alone than in the presence of benzene. The presence of chloroform or toluene did not exert any effect on benzene degradation. Similar compounds at the same concentration (i.e., benzene 10 ppm and toluene 10 ppm) had an additive toxicity interaction effect on C. dubia. That is, the combined toxicity effect of both was equal to the sum of the effect of each alone. Toluene was more toxic than benzene. Dissimilar compounds at the same concentration (i.e., benzene 10 ppm and chloroform 10 ppm) also had an additive toxicity interaction effect and benzene and chloroform had similar toxicities. The toxicity to toluene was significantly reduced after toluene degradation. The percentage of dead C. dubia for toluene treatments was 88% before biodegradation and 33% afterwards. On the other hand, the percentage of dead C. dubia for benzene was 33% before biodegradation and 24% afterwards. Thus, toxicity decreased only slightly after biodegradation in the case of benzene. In both cases, residual toxicity after biodegradation was presente. I suggest that bioremediation technologies incorporate routinely the use of bioassays for contaminated site clean-up.
650 $abenzene
650 $abiodegradation
650 $achloroform
650 $aecology
650 $apollutants
650 $atoluene
650 $atoxicology
650 $aBiodegradação
650 $aEcologia
650 $aPoluente
650 $aToxicologia
653 $aBenzeno
653 $aCloroformio
653 $aTolueno
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Registro original: |
Embrapa Pantanal (CPAP) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
30/12/2020 |
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Data da última atualização: |
30/12/2020 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
LIRA, E. G.; AMABILE, R. F.; RAMOS, S. D. R.; FAGIOLI, M.; BRIGE, F. A. A.; SALA, P. I. A. L.; LOURES, L. M. R.; CARVALHO, I. A. de; SILVA, T. P. da; CARVALHO, C. G. P.; ARTIAGA, I. F.; VIEIRA, W. F. |
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Afiliação: |
Ellen Grippi Lira, Universidade de Brasília, Brasília-DF.; RENATO FERNANDO AMABILE, CPAC; Samara Dias Rocha Ramos, Universidade de Brasília, Brasília-DF.; Marcelo Fagioli, Universidade de Brasília, Brasília-DF.; Felipe Augusto Alves Brige, Universidade de Brasília, Brasília-DF.; Pedro Ivo Aquino Leite Sala, Universidade de Brasília, Brasília-DF.; LINCOLN MOREIRA ROCHA LOURES, SIN; Igor Alencar de Carvalho, Universidade de Brasília, Brasília-DF.; Thiago Paulo da Silva; CLAUDIO GUILHERME PORTELA DE CARVAL, CNPSO; Isabella Fuckenr Artiaga, Universidade de Brasília, Brasília-DF.; WELINTON FERNANDES VIEIRA, SIN. |
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Título: |
AVALIAÇÃO DE GENÓTIPOS DE GIRASSOL COM BASE EM CARACTERÍSTICAS MORFOAGRONÔMICAS EM AMBIENTES DO CERRADO BRASILEIRO. |
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Complemento do título: |
SUNFLOWER GENOTYPES EVALUATION BASED ON THE AGRO-MORPHOLOGICAL CHARACTERISTICS IN THE BRAZILIAN SAVANNAH. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
In: REUNIÃO NACIONAL DE PESQUISA DE GIRASSOL, 23.; SIMPÓSIO NACIONAL SOBRE A CULTURA DO GIRASSOL, 11., 2020, Londrina. Anais... Londrina: Embrapa Soja, 2020. (Embrapa Soja. Documentos, 432). Editado por Regina Maria Villas Bôas de Campos Leite, Hugo Soares Kern. |
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Páginas: |
p. 113-115 |
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Série: |
(Embrapa Soja. Documentos, 432). |
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Idioma: |
Português |
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Notas: |
Artigo de acesso aberto. |
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Thesagro: |
Girassol. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 01108naa a2200289 a 4500
001 2128841
005 2020-12-30
008 2020 bl uuuu u00u1 u #d
100 1 $aLIRA, E. G.
245 $aAVALIAÇÃO DE GENÓTIPOS DE GIRASSOL COM BASE EM CARACTERÍSTICAS MORFOAGRONÔMICAS EM AMBIENTES DO CERRADO BRASILEIRO.$h[electronic resource]
260 $c2020
300 $ap. 113-115
490 $a(Embrapa Soja. Documentos, 432).
500 $aArtigo de acesso aberto.
650 $aGirassol
700 1 $aAMABILE, R. F.
700 1 $aRAMOS, S. D. R.
700 1 $aFAGIOLI, M.
700 1 $aBRIGE, F. A. A.
700 1 $aSALA, P. I. A. L.
700 1 $aLOURES, L. M. R.
700 1 $aCARVALHO, I. A. de
700 1 $aSILVA, T. P. da
700 1 $aCARVALHO, C. G. P.
700 1 $aARTIAGA, I. F.
700 1 $aVIEIRA, W. F.
773 $tIn: REUNIÃO NACIONAL DE PESQUISA DE GIRASSOL, 23.; SIMPÓSIO NACIONAL SOBRE A CULTURA DO GIRASSOL, 11., 2020, Londrina. Anais... Londrina: Embrapa Soja, 2020. (Embrapa Soja. Documentos, 432). Editado por Regina Maria Villas Bôas de Campos Leite, Hugo Soares Kern.
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