Microcystins
Mostrando 1-12 de 56 artigos, teses e dissertações.
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1. Allelopathic effects of the aquatic macrophyte Ceratophyllum demersum L. on phytoplankton species: contrasting effects between cyanobacteria and chlorophytes
Resumo Objetivo Avaliar os efeitos alelopáticos da macrófita submersa Ceratophyllum demersum sobre quatro cepas de espécies fitoplanctônicas: duas cianobactérias (Microcystis aeruginosa - produtora de microcistinas e M. panniformis - não produtora) e duas clorófitas (Ankistrodesmus falcatus e Raphidocelis subcapitata). Métodos Foi realizado um expe
Acta Limnol. Bras.. Publicado em: 08/08/2019
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2. Seleção de carvões ativados para adsorção de microcistinas
RESUMO A presença das cianobactérias é uma das grandes preocupações para o tratamento de água, uma vez que esses microrganismos podem ser produtores de metabólitos tóxicos, como as microcistinas (MCs), que não são efetivamente removidas no tratamento usualmente empregado de ciclo completo. Para a remoção dessas toxinas, pode-se, de forma compleme
Eng. Sanit. Ambient.. Publicado em: 30/05/2019
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3. MALDI Imaging Mass Spectrometry of Fresh Water Cyanobacteria: Spatial Distribution of Toxins and Other Metabolites
Cyanobacteria are among the most ancient forms of life, yet they are known to synthesize highly sophisticated defense molecules, such as the highly hepatotoxic cyclic peptides microcystins and nodularins produced by the genera Microcystis, Anabaena and Nodularia. These metabolites are released by cyanobacteria to water environments causing episodes of fatali
J. Braz. Chem. Soc.. Publicado em: 2017-04
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4. Antimycobacterial and cytotoxicity activity of microcystins
Background The present work aimed to evaluate the antimycobacterial activity and cytotoxicity of Microcystis aeruginosa toxins, the MC-LR variant and purified extract of [D-Leu1] microcystin-LR. Methods The antimicrobial activity of M. aeruginosa extract and microcystin was evaluated by resazurin microtiter assay against Mycobacterium tuberculosis, M. terra
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 31/03/2015
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5. Biodegradation of [D-Leu1] microcystin-LR by a bacterium isolated from sediment of Patos Lagoon estuary, Brazil
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 wat
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 31/03/2015
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6. Growth and microcystin production of a Brazilian Microcystis aeruginosa strain (LTPNA 02) under different nutrient conditions
Cyanobacteria are prokaryotic and photosynthetic organisms, which can produce a wide range of bioactive compounds with different properties; including a variety of toxic compounds, also known as cyanotoxins. In this work, we describe the isolation of seven cyanobacterial strains from two reservoirs in São Paulo State, Brazil. Seven different chemical varian
Rev. bras. farmacogn.. Publicado em: 2014-08
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7. Cyanobacteria, microcystins and cylindrospermopsin in public drinking supply reservoirs of Brazil
O Brasil tem um histórico de florações e contaminações por toxinas de cianobactérias nos seus ecossistemas de água doce. A relevância do monitoramento de toxinas de cianobactérias em reservatórios de abastecimento público é notória, devido à sua alta toxicidade para mamíferos, inclusive seres humanos. As cianotoxinas mais recorrentes em corpos
An. Acad. Bras. Ciênc.. Publicado em: 2013-12
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8. Validação de método analítico livre de acetonitrila para análise de microcistinas por cromatografia líquida de alta eficiência
Blooms of cyanobacteria represent a public health risk due to their cyanotoxins such as microcystins. Liquid chromatography techniques to separate and quantify microcystins invariably use acetonitrile as the organic component of the mobile phase. The price and availability of acetonitrile together with its elevated toxicity encourage the validation of aceton
Quím. Nova. Publicado em: 2013
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9. Microcystin-XR degradation by bacteria isolated from public water supply system / Degradação da microcistina-XR por bactérias isoladas de sistema de abastecimento público de água
Microcystins are potent hepatotoxins and tumor promoters found in freshwaters that cause public health risks and thus represent a serious problem for water treatment plants. The cyanobacterium genus Microcystis is the most known toxin-producer and the most common bloom-forming in water reservoirs used for public supply. However, some bacteria are able to use
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/09/2011
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10. Desenvolvimento de metodologia para controle das larvas de Limnoperna fortunei com o uso de radiação ultravioleta e seus impactos sobre Microscystis aeruginosa potencialmente presentes na água superficial
L. fortunei (Dunker, 1857), commonly known as golden mussel comes from Southeast Asia. It might have been unintentionally introduced in our water sources through ballast water, with the first records in 1991, in Rio de la Plata, near Buenos Aires, Argentina, South America. In Brazil it was first seen in 1998, in Jacuí Delta, opposite Porto Alegre¿s harbor.
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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11. Toxicity and genotoxicity in Astyanax bimaculatus (Characidae) induced by microcystins from a bloom of Microcystis spp
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. L
Genetics and Molecular Biology. Publicado em: 2010
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12. Identificação de microcistina LR ao nível molecular empregando microscopia de força atômica
Microcystins are non-ribosomal peptides that must be detected for its health concern. Here, microcystin LR and its specific antibody were respectively tethered to the substrate and to the tip of an atomic force microscope, after surface functionalization using 3-aminopropyltriethoxysilane and glutaraldehyde. Functionalization was confirmed comparing topograp
Química Nova. Publicado em: 2010