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| Registros recuperados: 73 | |
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| Berg, Gm; Balode, M; Purina, I; Bekere, S; Bechemin, Christian; Maestrini, Serge. |
| Trends in nitrogen utilization, determined with N-15-labeled substrates, were related to blooms of distinct phytoplankton groups in the Gulf of Riga, Baltic Sea, during May, June and July 1999. The dominant phytoplankton groups included diatoms, cryptophytes, dinoflagellates, and filamentous cyanobacteria. As the water column became progressively more stratified over the growing season, diatoms comprised a smaller proportion of the total phytoplankton assemblage and almost disappeared by late summer. Their disappearance correlated with undetectable surface-water nitrate concentrations and low nitrate uptake rates (5 to 8% of total nitrogen uptake). Diatoms were the only phytoplankton group significantly associated with the uptake of oxidized nitrogen... |
| Tipo: Text |
Palavras-chave: Nitrogen uptake; DON; Nitrate; Diatoms; Cyanobacteria; Cryptophytes; Baltic Sea; Gulf of Riga. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00000/10207/7595.pdf |
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| Reveillon, Damien; Abadie, Eric; Sechet, Veronique; Brient, Luc; Savar, Veronique; Bardouil, Michele; Hess, Philipp; Amzil, Zouher. |
| beta-N-methylamino-L-alanine (BMAA) is a neurotoxic non-protein amino acid suggested to be involved in neurodegenerative diseases. It was reported to be produced by cyanobacteria, but also found in edible aquatic organisms, thus raising concern of a widespread human exposure. However, the chemical analysis of BMAA and its isomers are controversial, mainly due to the lack of selectivity of the analytical methods. Using factorial design, we have optimized the chromatographic separation of underivatized analogues by a hydrophilic interaction chromatography coupled to tandem mass spectrometry (HILIC-MS/MS) method. A combination of an effective solid phase extraction (SPE) clean-up, appropriate chromatographic resolution and the use of specific mass spectral... |
| Tipo: Text |
Palavras-chave: Cyanotoxins; BMAA; DAB; AEG; HILIC-MS/MS; Cyanobacteria; Bivalve mollusks; French Mediterranean. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00245/35579/34112.pdf |
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| Catherine, A; Troussellier, Marc; Bernard, C. |
| This study describes the design and application of a stratified sampling strategy of waterbodies to assess and analyze the distribution of cyanobacteria at a regional scale (Ile-de-France, IDF). Ten groups of hydrographical zones were defined within the IDF on the basis of their anthropogenic and geomorphologic characteristics. Sampling effort (n = 50) was then randomly allocated according to the number of waterbodies in each group. This sampling strategy was tested in August 2006, using a field probe to estimate total phyto-plankton as well as cyanobacteria biomasses. The sampled waterbodies exhibited a wide range of phytoplankton (<1-375 mu g equiv.Chla L-1) and cyanobacteria biomasses (<1-278 mu g equiv. Chla L-1). 72% of the waterbodies in the... |
| Tipo: Text |
Palavras-chave: Sampling strategy; Land use; Lakes and reservoirs; Geographic information system; Cyanobacteria. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-5302.pdf |
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| Lemes-da-Silva,Nadia Martins; Branco,Luis Henrique Zanini; Necchi Júnior,Orlando. |
| Cyanobacteria are common in aquatic environments but are also well-adapted to terrestrial habitats where they are represented by a diversified flora. The present study aimed to contribute to our taxonomic knowledge of terrestrial cyanobacteria by way of a floristic survey of the main components of corticolous communities found in seasonal semideciduous forest fragments. Samples of visible growths of Cyanobacteria, algae, and bryophytes found on tree bark were randomly collected and their taxonomies examined. Eighteen species of Cyanobacteria were found belonging to the genera Aphanothece, Chroococcus, Lyngbya, Phormidium, Porphyrosiphon, Hapalosiphon, Hassalia, Nostoc, Scytonema, and Stigonema. Many genera and species observed in the present work have been... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aerophytic environment; Cyanobacteria; Seasonal semidecidous forest. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042012000200006 |
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| Sant'Anna,Célia L.; Azevedo,Maria Teresa de P.; Senna,Pedro Américo C.; Komárek,Jirí; Komárková,Jaroslava. |
| The biodiversity studies of planktic cyanobacteria started in 1997 with intensive collecting in different water bodies of São Paulo State. Due to the problems brougth by eutrophication and cyanobacterial blooms, the samplings were concentrated in reservoirs of Alto Tietê region that supply drinking water to millions of people. The samples were collected with 20 µm plankton net or Van Dorn's bottle. Part of each one was preserved in formaldehyde or lugol solution and part was isolated. The culture strains were kept in BG11 and/or AMS1 media. Based on natural and culture material, 26 species were identified belonging to the families Chroococcaceae (2 taxa), Merismopediaceae (12), Microcystaceae (7) and Synechococcaceae (5). Among these species, six are... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brazil; Chroococcales; Cyanobacteria; Plankton; Taxonomy. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042004000200002 |
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| Werner,Vera Regina; Sant'anna,Célia Leite; Azevedo,Maria Teresa de Paiva. |
| The paper proposed Cyanoaggregatum brasiliense, a new genus and species from the plankton of a subtropical brackish coastal lagoon from Rio Grande do Sul State, South Brazil. It differs from all other members of Chroococcales by its characteristic arrangement of cells in irregular groups distributed in a single, flat or slightly curved layer, on irregular rows, slightly distant from each other, forming a mosaic-like pattern slightly below the surface of the mucilaginous colonial envelope. The cell division in one plane perpendicular to the long axis and the lack of pseudo-filaments indicate its classification in the family Synechococcaceae, sub-family Aphanothecoideae. The general characteristics, the diagnostic criteria and the taxonomic position are... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coastal lagoon; Cyanoaggregatum brasiliense; Cyanobacteria; New genus and species; Southern Brazil. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042008000300012 |
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| GIANI,ALESSANDRA; FIGUEREDO,CLEBER C.; ETEROVICK,PAULA C.. |
| Neste trabalho foram descritos 28 táxons de algas planctônicas pertencentes às divisões Euglenophyta, Chrysophyta, Pyrrophyta e Cyanobacteria, encontradas no reservatório da Pampulha, estado de Minas Gerais. Foram analisadas amostras no período de maio/1992 a fevereiro/1997. Em número de espécies, Euglenophyta foi a que apresentou maior número (13 espécies em uma família), seguidas de Cyanobacteria (oito espécies), Pyrrophyta (cinco espécies) e Chrysophyta (duas espécies). Vinte e três táxons são primeiras citações para o estado de Minas Gerais. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Taxonomy; Euglenophyta; Chrysophyta; Pyrrophyta; Cyanobacteria. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041999000200001 |
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| Carvalho,Luciana R. de; Sant'Anna,Célia L.; Gemelgo,Marcina C.P.; Azevedo,Maria Teresa de P.. |
| Billings and Guarapiranga Reservoirs were deeply affected by environmental disturbances, which more evident consequence are the cyanobacterial blooms. Microcystins are the most common cyanotoxin in freshwaters and more than 70 types are known. Different methods for microcystins analysis in water can be used, among which ELISA and HPLC are the most frequently employed. However, less sophisticated and more economic methods can also be used. This is the case of planar chromatography (thin-layer chromatography) method previously used in cyanotoxins purification but gradually replaced by others. Posterior optimization of the microcystin chromatography conditions and because of its simplicity, rapidity, efficiency and low cost, this method is again considered an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cyanobacteria; Drinking water; Microcystins; Planar chromatography; Reservoirs. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042007000100014 |
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| LAVIN,PARIS; GÓMEZ,PATRICIA; GONZÁLE,BERNARDO; ULLOA,OSVALDO. |
| In order to assess the appropriateness of the use of internal transcribed spacer (ITS) sequences for the study of population genetics of marine cyanobacteria, we amplified and cloned the 16S rRNA gene plus the 16S-23S ITS regions of six strains of Prochlorococcus and Synechococcus. We analyzed them by denaturing gradient gel electrophoresis (DGGE) and terminal restriction fragment length polymorphisms (T-RFLP). When using the standard application of these techniques, we obtained more than one band or terminal restriction fragment (T-RF) per strain or cloned sequence. Reports in literature have suggested that these anomalies can result from the formation of secondary structures. Secondary structures of the ITS sequences of Prochlorococcus and Synechococcus... |
| Tipo: Journal article |
Palavras-chave: Cyanobacteria; DGGE; T-RFLP; ITS; Secondary structure. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000400006 |
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| Gaylarde,Peter M.; Gaylarde,Christine C.. |
| Algae and cyanobacteria disfigure the external surfaces of buildings and may cause their physico-chemical deterioration. Even though the climate in Brazil is humid, there is no published literature on this problem. The objective of this work was to identify the major phototrophs present on Brazilian constructions in residential, urban and rural sites. The algal and cyanobacterial types present on discolored surfaces of painted buildings in nine different municipalities in Brazil, all lying between latitudes 19° South and 30° South, were examined. A total of 816 different organisms was detected in 58 sites. Approximately 63% were single-celled or colonial organisms. The cyanobacterial genus, Synechocystis, was the most biodiverse and frequently comprised... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Algae; Biodeterioration; Brazil; Cyanobacteria; Paint films. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37141999000300005 |
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| Porfirio,Zenaldo; Ribeiro,Micheline P.; Estevam,Cicero S.; Houly,Ricardo L. S.; Sant'Ana,Antonio Euzébio G.. |
| Cyanobacteria (Microcystis aeruginosa), which produce powerful hepatotoxic cyclopeptides, were collected and submitted to the determination of toxicity through intraperitoneal injections made in 30 and 90 days-old Swiss albino mice. The liver and the spleen were histopathologically analyzed and the weight and vital signs development were monitored. Test of toxicity resulted in a LD50 of 154.28 mg.Kg-1. M. aeruginosa represented 95% of the analyzed biomass. The ratios between liver weight and body weight in the animal inoculated with a single dose were 6.0% and 7.2%, with multi doses 7.0% and 7.5% and in the control animals 4.0% and 5.0%, for adult and young animals, respectively. There was an accentuated increase in the volume and weight of the spleen, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Microcystis aeruginosa; Cyanobacteria; Hepatomegaly; Splenomegaly. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37141999000300016 |
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| Berthold,David Erwin; Elazar,Ariel; Lefler,Forrest; Marble,Christopher; Laughinghouse IV,Haywood Dail. |
| ABSTRACT Greenhouses and nurseries provide ideal environments for facilitating the formation of nuisance algal mats. Algal growth poses safety concerns to horticulturists and stimulates the propagation of unwanted plant pests and pathogens. To date, few strategies and data are available to effectively manage algal problems. The effectiveness of five algaecides was tested on two varying surfaces of greenhouses in situ to elucidate the efficacy of chemical methods of removing algae. Moreover, Nostoc commune (Vaucher ex Bornet & Flahault) was treated on ceramic tiles in vitro , as it is a common alga in greenhouses and nurseries. We found that each algaecide had different effects, depending on the chemical applied, the surface to which the chemical was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nostoc commune; DNA; Cyanobacteria; Herbicides; Management. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000101601 |
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| Neves,Cristina; Maroneze,Mariana Manzoni; Santos,Aline Meireles dos; Francisco,Erika Cristina; Wagner,Roger; Zepka,Leila Queiroz; Jacob-Lopes,Eduardo. |
| ABSTRACT This study aimed to evaluate third generation biodiesel production by microalgae Phormidium autumnale using cassava processing wastewater as a platform. Experiments were performed in a heterotrophic bubble column bioreactor. The study focused on the evaluation of the bioreactor (batch and fed-batch) of different operational modes and the analysis of biofuel quality. Results indicate that fed-batch cultivations improved system performance, elevating biomass and oil productions to 12.0 g L−1 and 1.19 g L−1, respectively. The composition of this oil is predominantly saturated (60 %) and monounsaturated (39 %), resulting in a biodiesel that complys with U.S., European and Brazilian standards. The technological route developed indicates potential for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Microalgae; Cyanobacteria; Agroindustrial wastewater; Biofuel. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000500412 |
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| PUYANA,Mónica; PRATO,Julián Alberto; NIETO,Christian Felipe; RAMOS,Freddy Alejandro; CASTELLANOS,Leonardo; PINZÓN,Paola; ZÁRATE,Juan Camilo. |
| ABSTRACT Blooms of marine benthic cyanobacteria are recurrent in several locations at the Colombian Caribbean. In these events, cyanobacteria grow over the substrate and benthic organisms although their effect has not been fully assessed. This study evaluated interactions between cyanobacteria and hermatypic corals, in order to identify any deleterious effects that could be related to allelopathic mechanisms. Organic extracts from cyanobacteria collected in San Andres, Old Providence and Rosario islands were tested against embryos of the reef-building coral Orbicella annularis. The indirect effect of cyanobacterial extracts was also assessed by resuspending the extracts in seawater and monitoring polyp retraction and recovery of the coral Madracis... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alellopathy; Corals; Cyanobacteria; Interspecific competition. |
| Ano: 2019 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2019000200243 |
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| POOT-DELGADO,Carlos Antonio; OKOLODKOV,Yuri B.; AKÉ-CASTILLO,José Antolin; RENDÓN von OSTEN.,Jaime. |
| ABSTRACT Cyanobacteria inhabit hypersaline, marine and freshwater environments. Some toxic and non-toxic species can form harmful blooms. The aim of this study was to identify potentially harmful cyanobacterial species in the oyster banks of Términos Lagoon, the southeastern Gulf of Mexico. Six sample sites (up to 2-m depth) were monitored monthly from August 2012 to September 2013. Water temperature, salinity, pH, dissolved oxygen saturation (% DO), inorganic nutrients and abundance of cyanobacteria were determined. Temperature and salinity were characterized by marked seasonal differences (26.8 to 30.6 °C and 6.1 to 19.5, respectively). The pH values (ranging from 7.1 to 8.4) and the % DO (88.4 to 118.2 %) suggest a predominance of photosynthetic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Annual cycle; Cyanobacteria; Eutrophication; Gulf of Mexico; Harmful algal blooms. |
| Ano: 2018 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2018000100051 |
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| Registros recuperados: 73 | |
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