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Hashimoto,Elisabete Hiromi; Kamogae,Márcia; Vanzella,Tatiana Perez; Cólus,Ilce Mara Syllus; Bracarense,Ana Paula Frederico Rodrigues Lourenço; Bittencourt-Oliveira,Maria do Carmo; Itano,Eiko; Kuroda,Emília Kiyomi; Kato,Hajime; Nagata,Satoshi; Ueno,Yoshio; Harada,Ken-Ichi; Hirooka,Elisa Yoko. |
This work investigated the effects of co-occurring aflatoxin B1 (AFB1) and microcystin (MC) in aquaculture, using immunohistochemistry and genotoxicity methods. Tilapia (Oreochromis niloticus) were exposed to AFB1 by intraperitoneal and MC (cell extract of Microcystis aeruginosa) by intraperitoneal and immersion routes. The interaction of MC-AFB1 was evaluated co-exposing the intraperitoneal doses. Blood samples were collected after 8, 24, and 48h to analyze the micronucleus frequency and comet score. The interaction of MC-AFB1 showed a synergic mutagenic response by higher micronucleus frequency of co-exposed group. A slight genotoxic synergism was also observed in the comet score. Immunohistochemistry detected MC in al lthe fish liver tissues exposed to... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Microcystis aeruginosa; Mycotoxin and tilapia. |
Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000100019 |
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Porfirio,Zenaldo; Ribeiro,Micheline P.; Estevam,Cicero S.; Houly,Ricardo L. S.; Sant'Ana,Antonio Euzébio G.. |
Cyanobacteria (Microcystis aeruginosa), which produce powerful hepatotoxic cyclopeptides, were collected and submitted to the determination of toxicity through intraperitoneal injections made in 30 and 90 days-old Swiss albino mice. The liver and the spleen were histopathologically analyzed and the weight and vital signs development were monitored. Test of toxicity resulted in a LD50 of 154.28 mg.Kg-1. M. aeruginosa represented 95% of the analyzed biomass. The ratios between liver weight and body weight in the animal inoculated with a single dose were 6.0% and 7.2%, with multi doses 7.0% and 7.5% and in the control animals 4.0% and 5.0%, for adult and young animals, respectively. There was an accentuated increase in the volume and weight of the spleen, and... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Microcystis aeruginosa; Cyanobacteria; Hepatomegaly; Splenomegaly. |
Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37141999000300016 |
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Almanza,Viviana; Parra,Oscar; Bicudo,Carlos E. De M.; Baeza,Carolina; Beltran,Johana; Figueroa,Ricardo; Urrutia,Roberto. |
BACKGROUND: During the last decades the frequency and global distribution of toxic cyanobacteria blooms has increased globally, which has been attributed to the eutrophication and climate change. In Chile there have been reports on blooms in aquatic ecosystem in localities with high density population and on the presence of five congeners of microcystins but only two documented toxics blooms with hundreds fish kills. We investigated the presence of toxic cyanobacteria blooms in the Lo Galindo urban lake, Concepción city, and the environmental factors that influence the abundance of cyanobacteria and microcystins concentration. Lo Galindo Lake, is used for various recreational and eventually as a drinking water source RESULTS: Toxic blooms of Microcystis... |
Tipo: Journal article |
Palavras-chave: Microcystin; Microcystis aeruginosa; Scums blooms; Dispersive blooms; Eutrophication; Urban lake; Chile. |
Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100008 |
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MATTHIENSEN,A.; YUNES,J. S.; CODD,G. A.. |
Diversas florações da cianobactéria Microcystis aeruginosa têm sido observadas nas águas do estuário da Lagoa dos Patos nos últimos 15 anos, sem o devido estudo de sua distribuição e ocorrência ou do risco de contaminação do ecossistema aquático. Neste estudo, foram realizadas a identificação e a quantificação das cianobactérias da região estuarina da Lagoa dos Patos, particularmente M. aeruginosa, incluindo um levantamento quali-quantitativo dos principais grupos microfitoplanctônicos em relação à sua distribuição geográfica no estuário. Evidenciou-se que, ao longo de 12 meses, Microcystis aeruginosa esteve presente na região estuarina, com valor máximo de 1,3.10(6)cél.L-1 em dezembro de 1994 e mínimo de 1,5.10(5) cél.L-1 em agosto de 1995, evidenciando a... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cianobactéria; Microcystis aeruginosa; Hepatotoxinas; Estuário da Lagoa dos Patos; Microcistinas. |
Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000300002 |
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Purvina, S; Béchemin, Christian; Balode, M; Verite, Celine; Arnaud, Christophe; Maestrini, Serge Y. |
The use of riverine dissolved organic matter by the heterotrophic bacteria associated with a culture of the cyanobacterium Microcystis aeruginosa and release of simple nitrogen compounds were studied in an experimental series. Bacteria reduced the bulk of dissolved organic nitrogen (DON) by half, but when associated with M. aeruginosa, DON was excreted and its concentration rose by 13%. During the stationary growth phase bacteria released ammonium, doubling the concentration of ammonia as well as of nitrates. Bacteria associated with M. aeruginosa consumed riverine DON and joined the ammonification and nitrification process, supplying cyanobacteria with simple nitrogen compounds. |
Tipo: Text |
Palavras-chave: Microcystis aeruginosa; Heterotrophic bacteria; DOM; DON; Nitrates; Ammonia. |
Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00353/46408/46122.pdf |
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Georges Des Aulnois, Maxime; Réveillon, Damien; Robert, Elise; Caruana, Amandine; Briand, Enora; Guljamow, Arthur; Dittmann, Elke; Amzil, Zouher; Bormans, Myriam. |
The transfer of Microcystis aeruginosa from freshwater to estuaries has been described worldwide and salinity is reported as the main factor controlling the expansion of M. aeruginosa to coastal environments. Analyzing the expression levels of targeted genes and employing both targeted and non-targeted metabolomic approaches, this study investigated the e ect of a sudden salt increase on the physiological and metabolic responses of two toxic M. aeruginosa strains separately isolated from fresh and brackish waters, respectively, PCC 7820 and 7806. Supported by di erences in gene expressions and metabolic profiles, salt tolerance was found to be strain specific. An increase in salinity decreased the growth of M. aeruginosa with a lesser impact on the... |
Tipo: Text |
Palavras-chave: Microcystis aeruginosa; Microcystin; Salt stress; Metabolomic; Transcript. |
Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00615/72689/71692.pdf |
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