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| 8. |  | FERREIRA, M. F.; NEUJAHR, E. B.; DALLMEYER, A. U.; SCHNEIDER, V.; FRANZ, C. A. B. Analise economica do desgaste para pneus agricolas. In: CONGRESSO BRASILEIRO DE ENGENHARIA AGRICOLA, 27., 1998, Pocos de Caldas, MG. Anais. Pocos de Caldas: SBEA/UFLA, 1998.v.3, p- 94 - 96. v.3. p.94-96.| Biblioteca(s): Embrapa Cerrados. |
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| 20. | | OLIVEIRA, W. B. dos S.; FERREIRA, A.; GUILHEN, J. H. S.; MARÇAL, T. de S.; FERREIRA, M. F. da S.; SENRA, J. F. de B. Análise de trilha e diversidade genética de Euterpe edulis Martius para caracteres vegetativos e de frutos. Scientia Forestalis, Piracicaba, v. 43, n. 106, p. 303-311, jun. 2015.| Biblioteca(s): Embrapa Florestas. |
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| Registros recuperados : 37 | |
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Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
15/12/2014 |
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Data da última atualização: |
15/12/2014 |
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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: |
RIVERO-WENDT, C. L. G.; BORGES, A. C.; OLIVEIRA FILHO, E. C. de; MIRANDA-VILELA, A. L.; FERREIRA, M. F. N.; GRISOLIA, C. K. |
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Afiliação: |
UNB; UNB; EDUARDO CYRINO DE OLIVEIRA FILHO, CPAC; UNB; UNB; UNB. |
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Título: |
Effects of 17α-methyltestosterone on the reproduction of the freshwater snail Biomphalaria glabrata. |
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Ano de publicação: |
2014 |
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Fonte/Imprenta: |
Genetics and Molecular Research, v. 13, n. 1, p. 605-615, 2014. |
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ISSN: |
1676-5680 |
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DOI: |
http://dx.doi.org/10.4238/2014.January.28.6 |
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Idioma: |
Inglês |
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Conteúdo: |
17-α-methyltestosterone (MT) is a synthetic hormone used in fish hatcheries to induce male monosex. Snails hold promise as possible test models to assess chemicals acting on the endocrine system. Biomphalaria glabrata is an aquatic gastropod mollusk (Pulmonata, Planorbidae) that can be easily maintained in aquaria, predisposing the species for use in ecotoxicological testing. This study evaluated the reproductive effects of MT on B. glabrata by examining histological changes and its reproductive performance. Ten snails per group were exposed for 4 weeks to different concentrations of MT (0.01, 0.1, and 1.0 mg/L). The total number of laid eggs, egg mass per group, size of type V oocytes, and production of spermatozoids were determined. Reproduction of B. glabrata was affected by MT. At the lowest concentration (0.01 mg/L), MT caused a statistically significant increase in the number of egg mass per snail compared with controls unexposed to MT. Histopathology analyses showed an increase in the sperm production at the higher MT concentrations of 0.1 and 1.0 mg/L. Chromatographic analyses of water samples showed that MT concentrations rapidly declined within a 96-h period. These results highlight the importance of giving more support to regulatory authorities, since MT is not registered for use on fish hatcheries in many countries around the world. Wastewater from fish farms discharged into aquatic ecosystems should be monitored for MT residues, since its presence could compromise the reproduction of other native snail species. Menos17-α-methyltestosterone (MT) is a synthetic hormone used in fish hatcheries to induce male monosex. Snails hold promise as possible test models to assess chemicals acting on the endocrine system. Biomphalaria glabrata is an aquatic gastropod mollusk (Pulmonata, Planorbidae) that can be easily maintained in aquaria, predisposing the species for use in ecotoxicological testing. This study evaluated the reproductive effects of MT on B. glabrata by examining histological changes and its reproductive performance. Ten snails per group were exposed for 4 weeks to different concentrations of MT (0.01, 0.1, and 1.0 mg/L). The total number of laid eggs, egg mass per group, size of type V oocytes, and production of spermatozoids were determined. Reproduction of B. glabrata was affected by MT. At the lowest concentration (0.01 mg/L), MT caused a statistically significant increase in the number of egg mass per snail compared with controls unexposed to MT. Histopathology analyses showed an increase in the sperm production at the higher MT concentrations of 0.1 and 1.0 mg/L. Chromatographic analyses of water samples showed that MT concentrations rapidly declined within a 96-h period. These results highlight the importance of giving more support to regulatory authorities, since MT is not registered for use on fish hatcheries in many countries around the world. Wastewater from fish farms discharged into aquatic ecosystems should be monitored for MT residues, since its presence could com... Mostrar Tudo |
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Palavras-Chave: |
Desreguladores endócrinos; Hormônio sintético; Performance reprodutiva. |
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Thesagro: |
Biomphalaria Glabrata; Histopatologia. |
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Thesaurus NAL: |
Endocrine-disrupting chemicals; Histopathology; Methyltestosterone; Reproductive performance; Synthetic hormones. |
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Categoria do assunto: |
S Ciências Biológicas |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/113741/1/34253.pdf
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Marc: |
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022 $a1676-5680
024 7 $ahttp://dx.doi.org/10.4238/2014.January.28.6$2DOI
100 1 $aRIVERO-WENDT, C. L. G.
245 $aEffects of 17α-methyltestosterone on the reproduction of the freshwater snail Biomphalaria glabrata.
260 $c2014
520 $a17-α-methyltestosterone (MT) is a synthetic hormone used in fish hatcheries to induce male monosex. Snails hold promise as possible test models to assess chemicals acting on the endocrine system. Biomphalaria glabrata is an aquatic gastropod mollusk (Pulmonata, Planorbidae) that can be easily maintained in aquaria, predisposing the species for use in ecotoxicological testing. This study evaluated the reproductive effects of MT on B. glabrata by examining histological changes and its reproductive performance. Ten snails per group were exposed for 4 weeks to different concentrations of MT (0.01, 0.1, and 1.0 mg/L). The total number of laid eggs, egg mass per group, size of type V oocytes, and production of spermatozoids were determined. Reproduction of B. glabrata was affected by MT. At the lowest concentration (0.01 mg/L), MT caused a statistically significant increase in the number of egg mass per snail compared with controls unexposed to MT. Histopathology analyses showed an increase in the sperm production at the higher MT concentrations of 0.1 and 1.0 mg/L. Chromatographic analyses of water samples showed that MT concentrations rapidly declined within a 96-h period. These results highlight the importance of giving more support to regulatory authorities, since MT is not registered for use on fish hatcheries in many countries around the world. Wastewater from fish farms discharged into aquatic ecosystems should be monitored for MT residues, since its presence could compromise the reproduction of other native snail species.
650 $aEndocrine-disrupting chemicals
650 $aHistopathology
650 $aMethyltestosterone
650 $aReproductive performance
650 $aSynthetic hormones
650 $aBiomphalaria Glabrata
650 $aHistopatologia
653 $aDesreguladores endócrinos
653 $aHormônio sintético
653 $aPerformance reprodutiva
700 1 $aBORGES, A. C.
700 1 $aOLIVEIRA FILHO, E. C. de
700 1 $aMIRANDA-VILELA, A. L.
700 1 $aFERREIRA, M. F. N.
700 1 $aGRISOLIA, C. K.
773 $tGenetics and Molecular Research$gv. 13, n. 1, p. 605-615, 2014.
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