Saxitoxins
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. A methodology for optimising the removal of cyanobacteria cells from a brazilian eutrophic water
This work is concerned with optimizing the performance of the coagulation process in terms of the removal of intact cyanobacteria cells and saxitoxins (STX). The evaluation has been carried out through bench-scale jar tests to construct coagulation diagrams for aluminium sulphate, polyaluminium chloride (PACl) and ferric chloride. The test water was taken fr
Brazilian Journal of Chemical Engineering. Publicado em: 2010-03
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2. Remoção de saxitoxinas por meio de oxidação com cloro / Remoção de saxitoxinas por meio de oxidação com cloro
A eutrofização artificial de reservatórios pode ter como consequência a ocorrência de florações de cianobactérias tóxicas e, no Brasil, é crescente o número de relatos de florações da espécie Cylindrospermopsis raciborskii produtora de saxitoxinas. O tratamento constituído por coagulação, floculação, sedimentação e filtração não remov
Publicado em: 2010
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3. Screening the toxicity and toxin content of blooms of the cyanobacterium Trichodesmium erythraeum (Ehrenberg) in northeast Brasil
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
Journal of Venomous Animals and Toxins including Tropical Diseases. Publicado em: 2009
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4. Removal of the organic contaminants β-estradiol and saxitoxins (STX, Neo-STX and dc-STX) by nanofiltration : bench scale / Remoção dos contaminantes orgânicos B-estradiol e saxitoxinas (STX, Neo-STX e dc-STX) por meiom de nanofiltração : avaliação em escala de bancada
The aim of work was to investigate the removal of β-estradiol and saxitoxins (STX, dc- STX and Neo-STX) by nanofiltration. These contaminants were selected due to its growing detection in drinking water reservoirs and their potential risk to human health, even at low concentrations. According to the literature, these substances are only poorly removed b
Publicado em: 2007
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5. Avaliação da toxicidade de florações naturais e de cultura de cianobactérias: efeitos sobre Ceriodaphnia silvestri (Crustacea, Cladocera)
The incidence of toxic cyanobacterial blooms is one of the important consequences of eutrophication in aquatic ecosystems. It is a very common phenomenon in reservoirs and shrimp ponds in the State of Rio Grande do Norte (RN), Brazil. Cyanobacterias produce toxins which can affect aquatic organisms and men trough the food chain. Aiming to contribute to the s
Publicado em: 2006
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6. Analysis of distribution, density and toxicity of cyanobacterial blooms and its toxins in the reservoirs of Middle and Low Tietê river (SP) and its relation with limnological characteristics of this system / Análise da distribuição, densidade e toxicidade de florações de cianobactérias em reservatórios do médio e baixo rio Tietê (SP) e relação com as características limnológicas do sistema
Reservoirs in Brazil, particularly in São Paulo State, are important ecosystems which were built up successively in the last 40 years. Some of these reservoirs, mainly at the Middle and the Low Tietê river cascade system are eutrophic. Frequently cyanobacterial blooms are related to these eutrophic conditions which compromise the multiple use of the reserv
Publicado em: 2005
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7. Dinâmica de populações de cianobactérias em reservatório eutrofizado no semi-árido nordestino brasileiro.
The Armando Ribeiro Gonçalves reservoir, located in the semi-arid of the Rio Grande do Norte (06o08 S ; 37o 07 W), in Northeast Brazil, represents 68% of the total surface water accumulated in the state. The reservoir, with maximum volumetric capacity of 2.4 x 109, provides 400 thousands habitants and also is destined to irrigation, leisure and fishing. It
Publicado em: 2003
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8. Evidence for paralytic shellfish poisons in the freshwater cyanobacterium Lyngbya wollei (Farlow ex Gomont) comb. nov.
Lyngbya wollei (Farlow ex Gomont) comb. nov., a perennial mat-forming filamentous cyanobacterium prevalent in lakes and reservoirs of the southeastern United States, was found to produce a potent, acutely lethal neurotoxin when tested in the mouse bioassay. Signs of poisoning were similar to those of paralytic shellfish poisoning. As part of the Tennessee Va