Microcystins (MCs) are toxins produced by cyanobacteria (blue-green algae), primarily Microcystis aeruginosa, forming water blooms worldwide. When an organism is exposed to environmental perturbations, alterations in normal ...

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 ...

A demanda alimentícia atual tem feito com que cultivos de organismos aquáticos se intensifiquem nas ultimas 3 décadas. Porém, para que isso seja possível fazendas de aquicultura tem aumentado o enriquecimento de seus ...

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 ...

Biological degradation of cyanobacterial hepatotoxin microcystins in estuarine and coastal water samples from the Patos Lagoon estuarine system, a coastal lagoon situated at the southernmost region of Brazil, was observed. ...

This paper evaluated the chemoprotective effect of lipoic acid (LA) against microcystin (MC) toxicity in carp Cyprinus carpio. To determine the LA dose and the time necessary for the induction of three different classes ...

Background: Many important toxins and antibiotics are produced by non-ribosomal biosynthetic pathways. Microcystins are a chemically diverse family of potent peptide toxins and the end-products of a hybrid NRPS and PKS ...

[D-Leu1]Microcystin-LR was identi®ed as the most abundant microcystin from a laboratory strain of the cyanobacterium Microcystis sp. isolated from a hepatotoxic Microcystis bloom from brackish waters in the Patos Lagoon ...

The effects of temperature and pH during extraction of toxin(s) from the cyanobacterial genus Anabaena were studied. Different extracts were compared for their anticholinesterase potency against purified eel acetylcholinesterase. ...

The effects of aqueous extracts from a cyanobacteria species, Anabaena spiroides, on fish (Odontesthes argentinensis), crab (Callinectes sapidus), and purified eel acetylcholinesterase (AChE) activity were studied. In vitro ...

As cianobactérias são organismos autotróficos comuns em diversos tipos de habitats naturais. Quando expostas à águas ricas em nutrientes, temperatura elevada e luz solar, podem formar florações. Essas florações podem afetar ...

Microcystin (MC) produced during cyanobacteria blooms is notably toxic to human and wildlife. Conjugation with reduced glutathione (GSH) by glutathione S transferase (GST) and the antioxidant enzymes defenses (e.g. catalase, ...

Florações da cianobactéria Microcystis são regulares e recorrentes na lagoa dos Patos e seu estuário (RS). Embora o primeiro registro científico seja datado de 1987, informações de antigos moradores das margens indicam que ...

We evaluated the effects of aqueous extracts of the cyanobacterium-producing microcystin (MC), Microcystis aeruginosa (strain ST9501), on detoxification capacity and glutathione (GSH) synthesis in liver, brain, gill, and ...

O gênero Trichodesmium ocorre nos oceanos tropicais e subtropicais do planeta e atua diretamente no ciclo do nitrogênio e do carbono. Por ser diazotrófico, Trichodesmium consegue estabelecer populações em regiões oligotróficas, ...

This paper proposes an approach for using remote sensing data for identification and mapping of cyanobacterial blooms; Methods: It uses two sets of spectra (empirical and theoretical) as reference to classify the areas ...

Microcystins (MCs) are toxins produced by cyanobacteria during the blooms that could accumulate in aquatic animals and be relocated to higher trophic levels. Adenosine triphosphate (ATP) acts as an excitatory ...

Microcystins (MCYST), common cyanobacterial hepatotoxins, have been observed in the Patos Lagoon and the estuary over the last three decades. Anthropogenic pollution associated to the environmental features has promoted ...

Cyanobacterial blooms and the accompanying production of cyanotoxins are a serious global problem. Toxic blooms of Anabaena species are common in lagoons and reservoirs of southern Brazil. Worldwide, species of the genus ...

O presente trabalho visou o estudo de Anabaena spiroides na Lagoa dos Patos e dos fatores ambientais favoráveis ao seu aparecimento. Durante 15 meses e em cinco pontos de amostragem ao longo do estuário, foram medidos ...