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Registros recuperados: 7
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Biodegradation of [D-Leu1] microcystin-LR by a bacterium isolated from sediment of Patos Lagoon estuary, Brazil J. Venom. Anim. Toxins incl. Trop. Dis.
Lemes,Gilmar AF; Kist,Luiza W; Bogo,Mauricio R; Yunes,João S.
Background Toxic cyanobacterial blooms are recurrent in Patos Lagoon, in southern Brazil. Among cyanotoxins, [D-Leu1] microcystin-LR is the predominant variant whose natural cycle involves water and sediment compartments. This study aimed to identify and isolate from sediment a bacterial strain capable of growing on [D-Leu1] microcystin-LR. Sediment and water samples were collected at two distinct aquatic spots: close to the Oceanographic Museum (P1), in Rio Grande City, and on São Lourenço Beach (P2), in São Lourenço do Sul City, southern Brazil. Methods [D-Leu1] microcystin-LR was isolated and purified from batch cultures of Microcystis aeruginosastrain RST9501. Samples of water and sediment from Rio Grande and São Lourenço do Sul were collected....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biodegradation; Microcystin; Sediment; Patos Lagoon; Estuary; Brazil.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992015000100313
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Genetic polymorphism in brazilian microcystis spp. (Cyanobacteria) toxic and non-toxic through RFLP-PCR of the cpcBA-IGS BABT
Bittencourt-Oliveira,Maria do Carmo; Cunha,Maristela Casé Costa; Moura,Ariadne do Nascimento.
The escalating occurrence of cyanobacterial toxic blooms demands a better understanding of genetic variability as an auxiliary expedient in species identification, collaborating with the monitoring of water destined to public supply. This study aimed at the unraveling of genetic polymorphism in the toxic and nontoxic strains of Microcystis (Cyanobacteria) species, isolated from diverse Brazilian localities through the RFLP-PCR technique applied to the c-phycocyanin encoding operon and its intergenic spacer (cpcBA-IGS). Eighteen strains belonging to M. aeruginosa, M. panniformis, M. protocystis and M. wesenbergii, plus two other unidentified strains, were analyzed by means of the morphological and molecular data. The molecular data constituted three groups...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cyanobacteria; CpcBA-IGS; Genetic polymorphism; Microcystin; Microcystis; RFLP.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000400014
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Occurrence of Microcystis aeruginosa and microcystins in Río de la Plata river (Argentina) Acta Toxicol. Argent.
Andrinolo,Darío; Pereira,Paulo; Giannuzzi,Leda; Aura,Claudia; Massera,Silvia; Caneo,Mariela; Caixach,Josep; Barco,Mónica; Echenique,Ricardo.
This paper is the first report on microcystins producer blooms of Microcystis aeruginosa in the Argentinean coast of the Río de la Plata river, the most important drinking water supply of Argentina. The distribution of toxic cyanobacterium Microcystis cf. aeruginosa blooms in the Argentinean coast of the Rio de la Plata river was studied from December 2003 and January 2006. Microcystis aeruginosa persisted in the river with values ranged between 0 - 7.8 10(4) cells ml-1. Samples of two Microcystis aeruginosa water blooms were collected at La Plata river and were analyzed by the mouse bioassay and by high-performance liquid chromatography with Diode-array and MS detector. The samples showed high hepatotoxicity in mouse bioassay and, in accordance, important...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Microcistys aeruginosa; Bloom; Rio de la Plata; Hepatotoxins; Microcystin; HPLC-Diode array.
Ano: 2007 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-37432007000100002
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Occurrence of toxic blooms of Microcystis aeruginosa in a central Chilean (36° Lat. S) urban lake RChHN
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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Salt Shock Responses of Microcystis Revealed through Physiological, Transcript, and Metabolomic Analyses ArchiMer
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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Screening the toxicity and toxin content of blooms of the cyanobacterium Trichodesmium erythraeum (Ehrenberg) in northeast Brasil J. Venom. Anim. Toxins incl. Trop. Dis.
Proença,LAO; Tamanaha,MS; Fonseca,RS.
Blooms of the cyanobacterium Trichodesmium occur in massive colored patches over large areas of tropical and subtropical oceans. Recently, the interest in such events has increased given their role in major nitrogen and carbon dioxide oceanic fluxes. Trichodesmium occurs all along the Brazilian coast and patches frequently migrate towards the coast. In this paper we screen the toxicity and toxin content of Trichodesmium blooms off the coast of Bahia state. Four samples, collected from February to April 2007, were analyzed. Organisms were identified and assessed for toxicity by means of several methods. Analogues of microcystins, cylindrospermopsins and saxitoxins were analyzed using HPLC. Microcystins were also assayed through ELISA. Results showed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Saxitoxin; Microcystin; Harmful algae; Trichodesmium; Bloom.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992009000200004
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Toxicity and genotoxicity in Astyanax bimaculatus (Characidae) induced by microcystins from a bloom of Microcystis spp Genet. Mol. Biol.
Silva,Ricardo Rocha Pavan da; Pires Junior,Osmindo Rodrigues; Grisolia,Cesar Koppe.
Studies of genotoxicity in fish caused by cyanobacterial microcystins can be useful both in determining the sensitivity of native species, as well as comparing exposure routes. The genotoxicity caused by the microcystins LR and LA from a bloom collected in a eutrophic lake, was revealed in the fish Astyanax bimaculatus, a native species from South America. LC50 (72 h) was determined as 242.81 µg L-1 and LD50 (72 h) as 49.19 µg kg-1 bw. There was a significant increase of DNA damage in peripheral erythrocytes, following intraperitoneal injection (ip) with tested concentrations of 24.58 µg kg-1 bw and 36.88 µg kg-1 bw, as well as through body exposure to a concentration of 103.72 µg L-1. Micronucleus (MN) induction was observed after ip injections of 24.58...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Microcystin; Comet assay; Fish micronucleus; Necrosis; Apoptosis.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000400023
Registros recuperados: 7
Primeira ... 1 ... Última
 

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