Cyanobacterial
Mostrando 1-12 de 480 artigos, teses e dissertações.
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1. Stability Analyses by HPLC-MS of Guanitoxin Isolated from Sphaerospermopsis torques-reginae
Guanitoxin (GNT) is a natural organophosphate produced by some species of freshwater cyanobacteria, which inhibits the active site of acetylcholinesterase, preventing the hydrolysis of cholinesterases and consequently causing serious disturbances in the neuromuscular system. Despite having a chemical structure like synthetic organophosphates, there is still
J. Braz. Chem. Soc.. Publicado em: 2021-08
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2. MÉTODO DE TRIAGEM DE MICROGININAS EM CIANOBACTÉRIAS POR LC-MS/MS
Cyanobacteria produce a wide variety of bioactive compounds, making them a highly promising group in the search for novel molecules with pharmacological and biotechnological properties. Among these, microginins attract attention for being peptides which inhibit angiotensin-converting enzyme, turning them into potential targets for hypertension and congestive
Quím. Nova. Publicado em: 2020-12
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3. Relationship between phytoplankton structure and environmental variables in tropical reservoirs with different trophic states
ABSTRACT Phytoplankton structure is influenced by environmental factors, seasonal cycles and the trophic state of the system. The objective of the present study was to identify guilds of phytoplankton species that are representative of seasonality and trophic status. We evaluated phytoplankton biomass and species composition in five tropical reservoirs, with
Acta Bot. Bras.. Publicado em: 2020-03
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4. Toxicological effects of ciprofloxacin and chlorhexidine on growth and chlorophyll a synthesis of freshwater cyanobacteria
Cyanobacteria are phytoplanktonic microorganisms that are susceptible to the deleterious effects of pharmaceutical residues in the aquatic environment, which poses a challenge to the environment exposed to diverse pharmaceutical products and their potential effects. The objective of this study was to evaluate the effects of the antibiotic substances ciproflo
Braz. J. Pharm. Sci.. Publicado em: 20/12/2019
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5. Genome-Wide Assessment of Putative Superoxide Dismutases in Unicellular and Filamentous Cyanobacteria
Abstract Cyanobacteria are photoautotrophic prokaryotes capable to grow in diverse ecological habitats, originated 2.5-3.5 billion years ago and were first to produce oxygen. Since then superoxide dismutases (SOD) acquired great significance due to their ability to catalyze detoxification of byproducts of oxygenic photosynthesis i.e. superoxide radicals. In
Braz. arch. biol. technol.. Publicado em: 20/12/2019
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6. Invasion and establishment of Ceratium furcoides (Dinophyceae) in an urban lake in Porto Alegre, RS, Brazil
ABSTRACT Ceratium furcoides has received attention due its invasive behavior in South America and consequent alterations in local phytoplankton communities. Pedalinhos Lake had been dominated by chlorophytes until 2015, when the first occurrence of this dinoflagellate was detected. In order to investigate the colonization process of this species, we monitore
Acta Bot. Bras.. Publicado em: 07/10/2019
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7. 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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8. Advances and limitations of using satellites to monitor cyanobacterial harmful algal blooms
Resumo O uso de satélites para o monitoramento de florestas é uma prática conhecida e comum. Entretanto o monitoramento remoto da qualidade da água ainda é escarça. Nos Estados Unidos da América (EUA), o uso deste tipo de dado está começando a ser utilizado para o monitoramento da floração de cianobactérias tóxicas (FCTs). Essa ferramenta podero
Acta Limnol. Bras.. Publicado em: 03/06/2019
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9. Phytoplankton scenario and microcystin in water during extreme drought in semiarid tropical water supplies, Northeastern Brazil
Resumo O objetivo deste trabalho foi caracterizar a comunidade limnológica, microistalina e fitoplanctônica de cinco reservatórios eutróficos tropicais localizados no semi-árido nordestino brasileiro, utilizados para uso doméstico no período de seca extrema e redução do volume de água. O estudo foi realizado em julho e agosto de 2015, e uma amostra
Braz. J. Biol.. Publicado em: 20/05/2019
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10. Unraveling algae and cyanobacteria biodiversity in bromeliad phytotelmata in different vegetation formations in Bahia State, Northeastern Brazil
ABSTRACT Knowledge of algal and cyanobacterial diversity of phytotelmata remains poorly-known, especially for bromeliads from different vegetation formations. We investigated the microalgae communities of four species of tank bromeliads from different vegetation formations in Bahia State, Northeast Brazil, highlighting the composition, richness and diversity
Acta Bot. Bras.. Publicado em: 04/06/2018
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11. 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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12. Cyanobacterial nitrogenases: phylogenetic diversity, regulation and functional predictions
Abstract Cyanobacteria is a remarkable group of prokaryotic photosynthetic microorganisms, with several genera capable of fixing atmospheric nitrogen (N2) and presenting a wide range of morphologies. Although the nitrogenase complex is not present in all cyanobacterial taxa, it is spread across several cyanobacterial strains. The nitrogenase complex has also
Genet. Mol. Biol.. Publicado em: 20/03/2017