Consulta: subjectFacets:"Cyanobacteria"
Registros recuperados: 73
Data/hora: 04/06/2024 04:33:07

Cyanophyta del Parque Nacional Nahuel Huapi (Argentina), II
Provedor de dados: 66
Autores: Wenzel,María T.; Díaz,Mónica M.
Se identificaron 88 taxones de Cyanophyta continentales pertenecientes a los órdenes Chroococcales, Oscillatoriales, Nostocales y Stigonematales. Se describen e ilustran las citas nuevas para nuestro país: Aphanothece smithii, Gloeothece palea, Hydrocoleum muscicola, Tolypothrix fragilis, Tolypothrix papyracea, Scytonema fritschii, Dichothrix baueriana, Stigonema flexuosum, Fischerella muscicola, Hapalosiphon delicatulus, Hapalosiphon luteolus y Anabaena variabilis f. tenuis. Otras 48 especies se registran por primera vez para el Parque Nacional Nahuel Huapi. Con respecto al hábitat, se señalan las especies planctónicas, metafíticas, epífitas, epiltícas y limícolas, y se incluyen características ecológicas y la distribución geográfica.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Argentina; Cyanobacteria; Cyanophyta; Cyanoprokariota; Ficoflora; Sistemática.
Ano: 2008
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0011-67932008000100005

Effect of Brachionus rubens on the growth characteristics of various species of microalgae
Provedor de dados: 69
Autores: Abou,Reda A.I; Singh,Manjinder; Rivera-Cruz,Anangelica; Power,Grace; Bagby-Moon,Thomas; Das,Keshav.
Background: Cultivation of algae for conversion to biofuels has gained global interest. Outdoor raceway cultivation is preferred because of its lower capital and operating costs. A major disadvantage of outdoor cultivation is susceptibility of algal crops to attack by predatory rotifers. In order to quantify the impact of rotifer attack on different species of algae, we evaluated the growth of eleven microalgal species over a 21-d period after being infected by the predatory rotifer Brachionus rubens. Results: Of the eleven species, Chlorella sorokiniana was the most susceptible with rapid decline in algal growth concomitant with increase in rotifer population growth (3.82/d). In contrast, Synechococcus elongatus andScenedesmus dimorphus were both...
Tipo: Journal article
Palavras-chave: Algae; Biofuels; Biomass; Cyanobacteria; FlowCam; Grazer.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000400010

Bioactivity of Scytonema hofmanni (Cyanobacteria) in Lilium alexandrae in vitro propagation
Provedor de dados: 69
Autores: Zaccaro,María Cristina; Kato,Adriana; Zulpa,Gloria; Storni,Mónica Magdalena; Steyerthal,Noemí; Lobasso,Karina; Stella,Ana María.
Cyanobacteria produces bioactive compounds including plant growth regulators. Naphthalene acetic acid (NAA), a toxic substance, is a synthetic plant regulator used in micropropagation. The aim of this work was to evaluate morphogenetic and antioxidant effects produced by intra and extracellular substances from Scytonema hofmanni (Cyanobacteria) during the multiplication in vitro of Lilium alexandrae and to compare them to those produced by NAA. Intra and extracellular cyanobacterial products increased a) bulblets production reaching 83% and 78% of NAA effect, respectively; b) the bulblet diameter compared to NAA; and c) the bulblet survival due to the promotion of antioxidant activity measured as catalase, ascorbate peroxidase, and glutathione reductase...
Tipo: Journal article
Palavras-chave: Ascorbate peroxidase; Bioactive substances; Bulb regeneration; Catalase; Cyanobacteria; Glutathione reductase; Lilium alexandrae; Scytonema hofmanni.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300007

Experimental and bioinformatic approaches for analyzing and visualizing cyanobacterial nitrogen and hydrogen metabolism
Provedor de dados: 69
Autores: Wünschiers,Röbbe; Axelsson,Rikard; Vellguth,Martin; Lindblad,Peter.
Many cyanobacteria are capable of utilizing light energy for nitrogen fixation. As a by-product of this nitrogenase mediated catalysis, hydrogen gas is produced. Several approaches to increase hydrogen production from cyanobacteria exist. Usually, these approaches are non-targeted. Here we exemplify how DNA-microarray based gene-expression analysis and bioinformatic visualization techniques can be used to analyze nitrogen and hydrogen metabolism from the filamentous, heterocyst forming cyanobacterium Nostoc PCC 7120. We analyzed the expression of 1249 genes from major metabolic categories under nitrogen fixing and non-nitrogen fixing growth. Of the selected genes, 494 show a more than 2-fold expression difference in the two conditions analyzed. Under...
Tipo: Journal article
Palavras-chave: Bioinformatics; Cyanobacteria; DNA-microarrays; Gene expression; Metabolic pathways; Nitrogen availability; Nitrogen fixation.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400008

Cyanobacterial nitrogenases: phylogenetic diversity, regulation and functional predictions
Provedor de dados: 74
Autores: Esteves-Ferreira,Alberto A.; Cavalcanti,João Henrique Frota; Vaz,Marcelo Gomes Marçal Vieira; Alvarenga,Luna V.; Nunes-Nesi,Adriano; Araújo,Wagner L.
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 a high theoretical potential for biofuel production, since H2 is a by-product produced during N2 fixation. In this review we discuss the significance of a relatively wide variety of cell morphologies and metabolic strategies that allow spatial and temporal separation of N2 fixation from photosynthesis in cyanobacteria. Phylogenetic reconstructions based on 16S rRNA and nifD gene sequences shed light on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyanobacteria; Evolution; Hydrogen; Nitrogen fixation; Molecular phylogeny.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000200261

Региональный алгоритм расчёта концентрации хлорофилла а в Чёрном море по спутниковым данным SeaWiFS.
Provedor de dados: 13
Autores: Суслин, В. В.; Чурилова, Т. Я.; Сосик, Х. М.
Анализ стандартных спутниковых продуктов SeaWiFS второго уровня, характеризующих выходящее из-под поверхности воды излучение nLw(λ) в спектральных каналах (СК) λ = 490, 510 и 555 нм, показал, что их комбинация в виде индексов, определяемых как отношения I510 = nLw(555)/nLw(510) и I510 = nLw(510)/nLw(490), обладает в Чёрном море существенной нелинейностью в течение года. Эта особенность легла в основу  метода разделения вкладов пигментов фитопланктона aph(λ) и суммы детрита и жёлтого вещества aCDM(λ) в поглощение света морской водой, и, как следствие, предложен региональный алгоритм определения концентрации хлорофилла а (Ca). Показано, что существуют, как минимум, два типа решений, соответствующих различному характеру поглощения света черноморской водой в...
Tipo: Journal Contribution
Palavras-chave: Видимый диапазон; Дистанционное зондирование; Поглощение; Хлорофилл а; Окрашенное растворённое органическое вещество; Цианобактерии; SeaWiFS; Региональный алгоритм; Чёрное море; Visible domain; Remote sensing; Absorption; Chlorophyll a; Colored dissolved organic matter; Cyanobacteria; Regional algorithm; Black Sea; Видимий діапазон; Дистанційне зондування; Поглинання; Хлорофіл а; Забарвлена розчинена органічна речовина; Ціанобактерії; Регіональний алгоритм; Чорне море.
Ano: 2008
URL: http://repository.ibss.org.ua/dspace/handle/99011/808

Донные цианобактерии в континентальных гиперсоленых озерах Крыма: предварительное сообщение
Provedor de dados: 13
Autores: Шадрин, Н. В.; Найданова, О. Г.
Впервые изучены цианобактерии континентальным гиперсоленых озерах Крыма. Всего определено 17 видов. Видовая структура очень изменчива. Общая биомасса цианобактерий в этих озерах может превышать 4 г·м–2.
Tipo: Journal Contribution
Palavras-chave: Гиперсоленые озера; Цианобактерии; Биомасса; Hypersaline lakes; Cyanobacteria; Biomass Biomass Biomass http://aims.fao.org/aos/agrovoc/c_926.
Ano: 2002
URL: http://repository.ibss.org.ua/dspace/handle/99011/418

Variação espaço-temporal de Rotifera em um reservatório eutrofizado no sul do Brasil
Provedor de dados: 76
Autores: Serafim-Júnior,Moacyr; Perbiche-Neves,Gilmar; Brito,Lineu de; Ghidini,André R; Casanova,Silvia M. C.
A variação espacial e temporal de rotíferos foi analisada em um reservatório pequeno, raso e eutrófico, com intensas florações de algas Cyanobacteria, em sete pontos de amostragem durante 17 meses (março/2002 a julho/2003). Foram identificados 52 táxons em 16 famílias, sendo Brachionidade, Conochilidae, Synchaetidae, Lecanidae, Collothecidae, Trichocercidae e Gastropodidae as mais frequentes. Collotheca sp. foi abundante no inverno (período seco), enquanto Conochilus coenobasis Skorikov, 1914 e Keratella cochlearis Gosse, 1851 apresentaram baixas abundâncias. Brachionus mirus var. reductus (Koste, 1972), Filinia longiseta (Ehrenberg, 1834) e Keratella lenzi (Hauer, 1953) apresentaram picos de abundância no verão (período chuvoso), e Kellicottia bostonensis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abastecimento; Eutrofização; Cyanobacteria.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212010000300008

Estudo prospectivo de tecnologias baseadas na biomassa de microalgas e cianobactérias: abordagens bibliométrica e patentométrica.
Provedor de dados: 14
Autores: SCHULTZ, E. L.; QUINTINO, R. P.; ANJOS, S. S. N. dos.
A Embrapa Agroenergia possui seis Linhas de Atuação, as quais correspondem às seis plataformas industriais de biorrefinarias: (i) açúcares C5/C6, (ii) óleos vegetais, (iii) biogás, (iv) algas, v) lignina e vi) bio-óleo/syngas. O objetivo geral deste estudo é identificar, por técnicas de patentometria e bibliometria, as tecnologias baseadas no uso da biomassa de microalgas e cianobactérias, no contexto mundial. Os resultados obtidos geraram diversas informações de cunho estratégico, como os principais processos que utilizam microalgas e cianobactérias, bem como os produtos obtidos e os gêneros taxonômicos usados. Além disso, os principais campos tecnológicos encontrados em documentos de patente foram mostrados e analisados, incluindo o mapa de emergência e...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Bibliometria; Cianobactéria; Patentometria; Estudo prospectivo; Microalga; Patente; Pesquisa; Biomassa; Microalgae; Cyanobacteria; Bibliometric analysis; Patents; Biomass.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1134493

Response of sedimentary processes to cyanobacteria loading
Provedor de dados: 5
Autores: Zilius, Mindaugas; De Wit, Rutger; Bartoli, Marco.
Sedimentation of pelagic cyanobacteria in dystrophic freshwater and oligohaline lagoons results in large inputs of labile organic matter (OM) to the benthos. We used an experimental approach to study the short-term impact of such phenomena on the benthic microbial community metabolism and on the nitrogen (N) fluxes across the sediment-water interface. We hypothesized an increase of respiratory activity, including N loss via denitrification and its recycling to the water column. Our results show that the incorporation within sediments of the settled bloom increases benthic bacterial activities. This is coupled to large DON and NH4+ effluxes, and to a comparatively smaller increase of N-2 production, while no significant effects were detected for the benthic...
Tipo: Text
Palavras-chave: Cyanobacteria; Organic matter; Sediments; Benthic metabolism; DON; Denitrification.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00354/46504/74457.pdf

First Evidence of Palytoxin and 42-Hydroxy-palytoxin in the Marine Cyanobacterium Trichodesmium
Provedor de dados: 5
Autores: Kerbrat, Anne Sophie; Amzil, Zouher; Pawlowiez, Ralph; Golubic, Stjepko; Sibat, Manoella; Darius, Helene Taiana; Chinain, Mireille; Laurent, Dominique.
Marine pelagic diazotrophic cyanobacteria of the genus Trichodesmium (Oscillatoriales) are widespread throughout the tropics and subtropics, and are particularly common in the waters of New Caledonia. Blooms of Trichodesmium are suspected to be a potential source of toxins in the ciguatera food chain and were previously reported to contain several types of paralyzing toxins. The toxicity of water-soluble extracts of Trichodesmium spp. were analyzed by mouse bioassay and Neuroblastoma assay and their toxic compounds characterized using liquid chromatography coupled with tandem mass spectrometry techniques. Here, we report the first identification of palytoxin and one of its derivatives, 42-hydroxy-palytoxin, in field samples of Trichodesmium collected in...
Tipo: Text
Palavras-chave: Cyanobacteria; Trichodesmium; Palytoxin; 42-hydroxy-palytoxin; Clupeotoxism.
Ano: 2011
URL: https://archimer.ifremer.fr/doc/00040/15143/12576.pdf

Cross talk: Two way allelopathic interactions between toxic Microcystis and Daphnia
Provedor de dados: 5
Autores: Bojadzija Savic, Gorenka; Bormans, Myriam; Edwards, Christine; Lawton, Linda; Briand, Enora; Wiegand, Claudia.
Due to eutrophication, freshwater ecosystems frequently experience cyanobacterial blooms, many of which produce bioactive metabolites that can affect vertebrates and invertebrates life traits. Zooplankton are able to develop tolerance as a physiological response to cyanobacteria and their bioactive compounds, however, this comes with energetic cost that in turn influence Daphnia life traits and may impair populations. Vice versa, it has been suggested that Daphnia are able to reduce cyanobacterial dominance until a certain cyanobacterial density; it remains unclear whether Daphnia metabolites alone influence the physiological state and bioactive metabolites production of cyanobacteria. Hence, this study investigates mutual physiological reactions of toxic...
Tipo: Text
Palavras-chave: Zooplankton; Cyanobacteria; Secondary metabolites; PCC7806; Toxic; Oxidative stress.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00624/73653/76105.pdf

Solid Phase Adsorption Toxin Tracking (SPATT) Technology for the Monitoring of Aquatic Toxins: A Review
Provedor de dados: 5
Autores: Roue, Melanie; Darius, Helene Taiana; Chinain, Mireille.
The Solid Phase Adsorption Toxin Tracking (SPATT) technology, first introduced in 2004, uses porous synthetic resins capable of passively adsorbing toxins produced by harmful microalgae or cyanobacteria and dissolved in the water. This method allows for the detection of toxic compounds directly in the water column and offers numerous advantages over current monitoring techniques (e.g., shellfish or fish testing and microalgae/cyanobacteria cell detection), despite some limitations. Numerous laboratory and field studies, testing different adsorbent substrates of which Diaion((R)) HP20 resin appears to be the most versatile substrate, have been carried out worldwide to assess the applicability of these passive monitoring devices to the detection of toxins...
Tipo: Text
Palavras-chave: SPATT technology; Passive monitoring; Risk assessment; Harmful algal blooms; Aquatic toxins; Microalgae; Cyanobacteria.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00660/77225/78667.pdf

Characterization of phototrophic microorganisms and description of new cyanobacteria isolated from the saline-alkaline crater-lake Dziani Dzaha (Mayotte, Indian Ocean)
Provedor de dados: 5
Autores: Cellamare, M.; Duval, C.; Drelin, Y.; Djediat, C.; Touibi, N.; Agogue, H.; Leboulanger, C.; Ader, M.; Bernard, C.
The saline-alkaline crater-lake Dziani Dzaha (Mayotte, Indian Ocean) is dominated by the bloom-forming cyanobacterium Arthrospira. However, the rest of the phototrophic community remains underexplored because of their minute dimension or lower biomass. To characterize the phototrophic microorganisms living in this ecosystem considered as a modern analog of Precambrian environments, several strains were isolated from the water column and stromatolites, and analyzed using the polyphasic approach. Based on morphological, ultrastructural and molecular (16S rRNA gene, 18S rRNA gene, 16S-23S ITS region, cpcBA-IGS locus) methods, seven filamentous cyanobacteria and the prasinophyte Picocystis salinarum were identified. Two new genera and four new cyanobacteria...
Tipo: Text
Palavras-chave: Cyanobacteria; Microalgae; Crater-lake; Saline-alkaline lake; Polyphasic approach; Arthrospira.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00443/55469/56991.pdf

Preliminary metabolomic approach on cyanobacterial co-cultures: Chemically mediated interactions between Microcystis and Planktothrix
Provedor de dados: 5
Autores: Mondeguer, Florence; Sibat, Manoella; Reubrecht, Sébastien; Amzil, Zouher; Bormans, Myriam; Hess, Philipp; Briand, Enora.
Cyanobacterial proliferation is one of the most harmful hazards, in both freshwater and marine ecosystems. Cyanobacteria are well known for their ability to produce a wide variety of bioactive compounds, some of which have been described as allelochemicals. There is growing evidence that these secondary metabolites play an important role in shaping community composition through biotic interactions; however, for the most part, their biological role and mode of regulation of the production are poorly understood. In temperate eutrophic freshwaters, Microcystis and Planktothrix often co-occur, with Planktothrix being an early colonizer and Microcystis appearing subsequently. By integrating LC-MS/MS molecular networking and an innovative experimental design, we...
Tipo: Text
Palavras-chave: Cyanobacteria; Cyanotoxins; Plankton interactions; Co_culture; LC_HRMS; Molecular Network; Metabolomics.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00405/51666/52215.pdf

Daphnia magna Exudates Impact Physiological and Metabolic Changes in Microcystis aeruginosa
Provedor de dados: 5
Autores: Bojadzija Savic, Gorenka; Edwards, Christine; Briand, Enora; Lawton, Linda; Wiegand, Claudia; Bormans, Myriam.
While the intracellular function of many toxic and bioactive cyanobacterial metabolites is not yet known, microcystins have been suggested to have a protective role in the cyanobacterial metabolism, giving advantage to toxic over nontoxic strains under stress conditions. The zooplankton grazer Daphnia reduce cyanobacterial dominance until a certain density, which may be supported by Daphnia exudates, affecting the cyanobacterial physiological state and metabolites’ production. Therefore, we hypothesized that D. magna spent medium will impact the production of cyanobacterial bioactive metabolites and affect cyanobacterial photosynthetic activity in the nontoxic, but not the toxic strain. Microcystin (MC-LR and des-MC-LR) producing M. aeruginosa PCC7806 and...
Tipo: Text
Palavras-chave: Cyanobacteria; Secondary metabolites; PCC7806; Toxic; Mutant; Infochemicals.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00507/61893/65980.pdf

Geochemistry of an endorheic thalassohaline ecosystem: the Dziani Dzaha crater lake (Mayotte Archipelago, Indian Ocean)
Provedor de dados: 5
Autores: Sarazin, Gérard; Jezequel, Didier; Leboulanger, Christophe; Fouilland, Eric; Le Floc'H, Emilie; Bouvy, Marc; Gerard, Emmanuelle; Agogué, Hélène; Bernard, Cédric; Hugoni, Mylène; Grossi, Vincent; Trousselier, Marc; Ader, Magali.
Dziani Dzaha is a maar the age of which is close to 4000 years. While its water is thought to have originated from seawater it is now considered as an extreme environment due to its hypersaline and alkaline characteristics. Those extreme features have led to the simplification of the trophic network. Cyanobacteria account for up to 95% of the photosynthetic biomass. The main biogeochemical processes, i.e. photosynthesis, bacterial sulfate reduction and methanogenesis could explain the current water composition. As far as we know, this ecosystem could be unique on Earth, extending the nature and chemical limits of aquatic inland ecosystems
Tipo: Text
Palavras-chave: Thalassohaline lake; Endorheic ecosystem; Cyanobacteria; Methane emission; Biogeochemistry; Mayotte.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00667/77948/80128.pdf

Cyanobacterial populations that build 'kopara' microbial mats in Rangiroa, Tuamotu Archipelago, French Polynesia
Provedor de dados: 5
Autores: Richert, Laurent; Golubic, Stjepko; Le Guedes, Roland; Herve, Annie; Payr, Claude.
Cyanobacterial populations, the primary producers and builders of 'kopara' microbial mats were studied in four selected ponds along the rim of the Rangiroa Atoll, French Polynesia using a polyphasic approach. Seven isolates were maintained in uni-cyanobacterial cultures, characterized morphotypically and phylogenetically by evaluating sequences of the 16S rRNA gene of about 620 base pairs in length. Cyanobacteria in natural populations were analyzed microscopically, characterized morphotypically, and compared with cultured strains. Three of the isolates were identified in the field samples: Lyngbya aestuarii, Johannesbaptistia pellucida and Chroococcus submarinus were present in the mats only as minor components, whereas the species of Schizothrix that...
Tipo: Text
Palavras-chave: 16S rRNA; Polyphasic approach; Phylogeny; Microbial mats; Microbial ecology; Kopara; Diversity; Cyanobacteria; Culture.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2050.PDF

Stimulation of nitrogen-fixing cyanobacteria in a Baltic Sea plankton community by land-derived organic matter or iron addition
Provedor de dados: 5
Autores: Stolte, Willem; Balode, Maija; Carlsson, Per; Grzebyk, Daniel; Janson, Sven; Lips, Inga; Panosso, Renata; Ward, Clive J.; Graneli, Edna.
In the Baltic Sea, floating blooms of nitrogen-fixing cyanobacteria occur yearly during late summer. These blooms can sometimes be limited by iron. Due to extensive foresting around the Baltic Sea, iron is entering the Baltic Sea partly bound to dissolved organic material (DOM) via rivers. An experiment was performed in 300 1 laboratory mesocosms to test the hypothesis that riverine high-molecular weight dissolved organic matter (HMWDOM), extracted by tangential flow filtration &gt; 1000 Da, stimulates the biomass of nitrogen-fixing cyanobacteria, by increasing the availability of iron. The addition of iron/EDTA and of DOM resulted in 5 to 10 times higher biomass of nitrogen-fixing cyanobacteria. Accordingly, higher primary production and particulate...
Tipo: Text
Palavras-chave: Mesocosm experiment; Humic acid; HMWDOM; High molecular weight dissolved organic matter; Iron; Nitrogen fixation; Cyanobacteria.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2470.pdf

BMAA et cyanotoxines : microalgues productrices et niveaux d’accumulation dans les organismes marins
Provedor de dados: 5
Autores: Reveillon, Damien.
BMAA (â-N-methylamino-L-alanine) is a non proteinogenic neurotoxic amino acid that has been associated with amyotrophic lateral sclerosis. Its analytical detection is widely debated thus the global production of BMAA by cyanobacteria is questioned. We first aimed at developing an analytical method allowing for highly selective identification of BMAA and isomers, using HILIC chromatography coupled to mass spectrometry. Then, we have cultivated and analyzed more than 50 microalgae (e.g. cyanobacteria, diatoms). Unlike DAB, one of its natural isomer, BMAA was only reported in five diatom species and cannot be accounted as a cyanotoxin anymore. In parallel, we have evaluated the presence of BMAA on the three French coasts. The presence of BMAA in different...
Tipo: Text
Palavras-chave: DAB; Cyanotoxines; CL-SM/SM; Diatomées; Cyanobactéries; Bivalves; BMAA; DAB; Cyanotoxins; LC-MS/MS; Diatoms; Cyanobacteria; Bivalves.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00295/40651/39617.pdf

Plankton community composition in relation to availability and uptake of oxidized and reduced nitrogen
Provedor de dados: 5
Autores: 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

Beta-N-Methylamino-L-Alanine: LC-MS/MS Optimization, Screening of Cyanobacterial Strains and Occurrence in Shellfish from Thau, a French Mediterranean Lagoon
Provedor de dados: 5
Autores: 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

Design and application of a stratified sampling strategy to study the regional distribution of cyanobacteria (Ile-de-France, France)
Provedor de dados: 5
Autores: 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 (&lt;1-375 mu g equiv.Chla L-1) and cyanobacteria biomasses (&lt;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

Nuevos registros de cianobacterias planctónicas en la Bahía de Jigüey, Cuba
Provedor de dados: 20
Autores: Dobal, V.; Lugioyo, G. M.; Alamo, B.; Loza Álvarez, S.
En el presente trabajo se presenta una lista de  21 especies de cianobacterias planctónicas encontradas en la Bahía de Jigüey (Cuba), que no habían sido informadas para las aguas costeras cubanas. Las muestras se colectaron en los meses de diciembre del 2010 y septiembre del 2011. Los resultados de este trabajo contribuyen a enriquecer el conocimiento de la biodiversidad microbiana marina en Cuba.
Tipo: Journal Contribution
Palavras-chave: Bacterioplankton; Biodiversity; Coastal environment; Cyanobacteria; Biodiversity; Coastal area.
Ano: 2012
URL: http://hdl.handle.net/1834/4591

Corticolous cyanobacteria from tropical forest remnants in northwestern São Paulo State, Brazil
Provedor de dados: 88
Autores: 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

Occurrence of the rare genus Microcrocis P. Richter (Chroococcales, Cyanobacteria) in a coastal lagoon from southern Brazil
Provedor de dados: 88
Autores: Werner,Vera Regina; Sant’anna,Célia Leite.
The paper records the first occurrence of the genus Microcrocis P. Richter (Chroococcales, Cyanobacteria), represented by M. pulchella (Buell) Geitler, in Brazil. The species was found in two zones, one with freshwater and the other with brackish water, of a coastal lagoon of Rio Grande do Sul State (31°15’-31°30’ S and 50°54’-51°09’ W). Comparison between M. pulchella and its most closely related species is presented. Up to now this species had occurrence records limited to freshwater systems in temperate regions. Its presence in a subtropical coastal lagoon from southernmost Brazil, either in fresh or in brackish water, broadened the knowledge of the distribution area of M. pulchella.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Coastal lagoon; Cyanobacteria; Microcrocis.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042006000100016

Planktic Cyanobacteria from São Paulo State, Brazil: Chroococcales
Provedor de dados: 88
Autores: 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

Cyanoaggregatum brasiliense gen. et sp. nov., a new chroococcal Cyanobacteria from Southern Brazil
Provedor de dados: 88
Autores: 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

Effect of nitrate and ammonium on the growth and protein concentration of Microcystis viridis Lemmermann (Cyanobacteria)
Provedor de dados: 88
Autores: Rückert,Gabriela Von; Giani,Alessandra.
Cyanobacteria are a very important group in aquatic systems, particularly in eutrophic waters. Therefore studies about their success in the environment are essential. Many hypotheses have tried to explain the dominance of Cyanobacteria, and several emphasized the importance of various nitrogen sources for the success of the group. In this study, we measured the effect of ammonium and nitrate on the growth and protein concentration of Microcystis viridis (Cyanobacteria). This species is well-known because bloom formation in eutrophic waters. The study was carried out, in experimental batch cultures, using the WC medium with different nitrogen sources: ammonium, nitrate, ammonium + nitrate (50% ammonium + 50% nitrate) and ammonium at different concentrations...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonium; Cyanobacteria; Eutrophication; Growth; Nitrate; Protein concentration.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042004000200011

Cylindrospermopsis raciborskii (Woloszynska) Seenayya &amp;amp; Subba Raju(Cyanobacteria): variação semanal e relações com fatores ambientais em um reservatório eutrófico, São Paulo, SP, Brasil
Provedor de dados: 88
Autores: Tucci,Andréa; Sant'Anna,Célia L.
Florações de Cylindrospermopsis raciborskii têm sido cada vez mais freqüentes em reservatórios brasileiros em virtude da sua alta competitividade em ambientes tropicais eutrofizados. Esta espécie é produtora de toxinas extremamente agressivas, as quais podem causar problemas de saúde pública e danos ao meio ambiente. Nosso objetivo foi acompanhar a variação temporal da densidade desta população relacionando-a com variáveis ambientais e detectando os possíveis fatores que interferem no seu desenvolvimento. O lago estudado localiza-se na zona sul do Município de São Paulo (23º39' S e 46º37' W). É um corpo d'água eutrofizado e vem apresentando florações freqüentes de C. raciborskii. Amostras de água foram coletadas semanalmente, na parte mais profunda do...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyanobacteria; Cylindrospermopsis raciborskii; Reservatório eutrófico; Variação semanal.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042003000100011

Algas planctônicas do reservatório da Pampulha (MG): Euglenophyta,  Chrysophyta, Pyrrophyta, Cyanobacteria
Provedor de dados: 88
Autores: 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

Cyanobacterial occurrence and detection of microcystin by planar chromatography in surface water of Billings and Guarapiranga Reservoirs, SP, Brazil
Provedor de dados: 88
Autores: 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

Diversity of the marine picocyanobacteria Prochlorococcus and Synechococcus assessed by terminal restriction fragment length polymorphisms of 16S-23S rRNA internal transcribed spacer sequences
Provedor de dados: 97
Autores: 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

Use of Spirulina platensis in treatment of fish farming wastewater
Provedor de dados: 124
Autores: Nogueira,Sara Monaliza Sousa; Souza Junior,José; Maia,Hudson Damasceno; Saboya,Jefferson Pablo Sousa; Farias,Wladimir Ronald Lobo.
ABSTRACT Each year, the amount of fish produced around the world increases, which contributes to several environmental impacts such as the disposal of effluents without treatment in the environment. This scientific work had as main objective the development of Spirulina platensis in fish effluents, a low cost medium for the production of biomass, in order to reduce the levels of some inorganic nutrients to reach the allowed parameters by the Brazilian environmental standards for effluent disposal and to enable reuse of the water. Nile tilapia (Oreochromis niloticus) fingerlings were produced in fresh water. The effluent generated by the culture was transferred to a pool where seawater was added until the salinity of 10 ‰ was reached. A strain of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oreochromis niloticus; Microalgae; Cyanobacteria; Bioremediation; Nutrients.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000400599

Algae and cyanobacteria on painted surfaces in Southern Brazil
Provedor de dados: 59
Autores: 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

Hepatosplenomegaly caused by an extract of cyanobacterium Microcystis aeruginosa bloom collected in the Manguaba Lagoon, Alagoas - Brazil
Provedor de dados: 59
Autores: 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

Control of algal growth on greenhouse surfaces using commercial algaecides
Provedor de dados: 63
Autores: 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 &amp; 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

Cassava processing wastewater as a platform for third generation biodiesel production
Provedor de dados: 63
Autores: 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

EXPERIMENTAL APPROACHES FOR THE EVALUATION OF ALLELOPATHIC INTERACTIONS BETWEEN HERMATYPIC CORALS AND MARINE BENTHIC CYANOBACTERIA IN THE COLOMBIAN CARIBBEAN
Provedor de dados: 37
Autores: 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

POTENTIALLY HARMFUL CYANOBACTERIA IN OYSTER BANKS OF TÉRMINOS LAGOON, SOUTHEASTERN GULF OF MEXICO
Provedor de dados: 37
Autores: 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

BIOFERTILIZATION WITH CHLOROPHYTA AND CYANOPHYTA: AN ALTERNATIVE FOR ORGANIC FOOD PRODUCTION
Provedor de dados: 37
Autores: ORTIZ-MORENO,Martha Lucía; SOLARTE-MURlLLO,Laura Vanessa; SANDOVAL-PARRA,Karen Ximena.
ABSTRACT Chlorophyta and Cyanophyta are photosynthetic organisms characterized by their biochemical plasticity, which has allowed them to develop in different environments and have a faster growth rate than plants. Depending on the species and environmental conditions, these organisms can produce nitrogenous enzymes, for atmospheric nitrogen fixation; phosphatases, that solubilize phosphorus; phytohormones, that promote plant growth; and hygroscopic polysaccharides, that prevent erosion and improve soil characteristics. In this sense, the aim of this review was to analyze the available information on the use of Chlorophyta and Cyanophyta as biofertilizers and their potential application in organic food production. Multiple studies and researches were found...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biofertilizers; Cyanobacteria; Green algae; Organic agriculture.
Ano: 2020
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2020000200303

Considerations regarding the dominance of Cylindrospermopsis raciborskii under low light availability in a low phosphorus lake
Provedor de dados: 39
Autores: Tonetta,Denise; Hennemann,Mariana Coutinho; Brentano,Débora Monteiro; Petrucio,Mauricio Mello.
ABSTRACTAlthough many studies have shown that the dispersion, increased abundance and dominance of cyanobacteria can be attributed to nutrient enrichment, we discuss features contributing to the dominance of Cylindrospermopsis raciborskii in a shallow, polymictic, subtropical coastal lake with low phosphorus and light limitation (Peri Lake). The presence and dominance of C. raciborskii in an environment with such characteristics emphasizes the idea that nutrients alone do not explain the high density of this cyanobacterium. Other features should be considered in explaining this species dominance, such as phosphorus storage and physiological flexibilitywhich seem to be key features to high densities in low phosphorus systems.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Cyanobacteria; Cyanotoxins; Freshwater; Nutrients; Peri Lake; Phytoplankton; Plasticity; Subtropical.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000300448

Soft-bodied benthic algae in pristine Brazilian streams: from acid to karst
Provedor de dados: 39
Autores: Fonseca,Bárbara Medeiros; Feijó,Lidia Mendes; Mendonça-Galvão,Luciana de.
ABSTRACT This study evaluated soft-bodied benthic algae from seven streams located in protected areas of central Brazil (Parque Nacional de Brasília, Parque Nacional da Chapada dos Veadeiros and Parque Estadual de Terra Ronca), and related them to abiotic factors. We addressed the following questions: A) how algal community structure in Cerrado streams is influenced by the marked seasonality typical of the region; and B) how karst geology influences algal communities in Parque Estadual de Terra Ronca, as compared to streams in other Cerrado areas. Samples were collected between 2012 and 2013 from a single site in each stream, and upstream and downstream of caves present in Parque Estadual de Terra Ronca. Altogether, 159 taxa were recorded. Algal community...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abiotic variables; Biodiversity; Cerrado; Cyanobacteria; Lotic systems; Periphyton; Soft-bodied algae; Pristine streams; Zygnematophyceae.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000300517

Relationship between phytoplankton structure and environmental variables in tropical reservoirs with different trophic states
Provedor de dados: 39
Autores: Oliveira,Simone Alves de; Ferragut,Carla; Bicudo,Carlos Eduardo de Mattos.
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 different trophic states and during rainy and dry periods. At most of the sampling sites, total biomass was higher during the rainy season. Moreover, high cyanobacterial biomass was observed in all reservoirs except for one of the mesotrophic reservoirs, which had no significant contribution from the group. Phytoplankton guilds associated with the trophic gradient and seasonality were identified....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyanobacteria; Phytoplankton; Guild; Reservoir; Seasonality.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000100083

Biodiversidade e considerações biogeográficas das Cyanobacteria de uma área de Manguezal do Estado de Pernambuco, Brasil
Provedor de dados: 39
Autores: Branco,Luis Henrique Zanini; Moura,Ariadne do Nascimento; Silva,Adriana Cristina da; Bittencourt-Oliveira,Maria do Carmo.
Manguezais caracterizam-se por apresentarem amplas variações ambientais (principalmente de salinidade, irradiância e teor de oxigênio) e possuírem substrato relativamente instável, o que exige adaptações específicas dos organismos para habitar com sucesso este ambiente. O presente estudo procura, principalmente, contribuir com o conhecimento da biodiversidade, através da realização do levantamento da flora de cianobactérias habitantes de Manguezais do Estado de Pernambuco. Foram realizadas amostragens quinzenais em quatro pontos distintos do Manguezal do rio Paripe, entre agosto e dezembro/1998, totalizando 27 amostras coletadas. A identificação das principais cianobactérias componentes das comunidades revelou a presença de 16 espécies, distribuídas em 11...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyanobacteria; Mangue; Levantamento taxonômico; Biogeografia; Pernambuco.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062003000400010

Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir
Provedor de dados: 39
Autores: Wojciechowski,Juliana; Burda,Tamires Marcela; Scheer,Mauricio Bergamini; Costa,Elaine Aparecida Dias da; Fernandes,Luciano Felício.
ABSTRACT Intensive growth of aquatic macrophytes interferes with water quality and ecosystem dynamics worldwide. Although mechanically removing macrophytes is the most commonly used method for their eradication, it can also cause undesirable disturbances in aquatic reservoir communities. We performed laboratory incubations of phytoplankton sampled before and after macrophytes were mechanically removed from the Piraquara II reservoir, South Brazil. We analyzed changes in growth and composition of the main phytoplankton groups with respect to nutrient shifting. Prior to removing the macrophytes, the phytoplankton community was dominated by low cell abundances of diatoms and flagellates. In contrast, growth rates of cyanobacteria (mainly Cylindrospermopsis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophytes; Cyanobacteria; Diatoms; Macrophytes; Mechanical removal; Phytoplankton; Reservoir management.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000400588

Alimentação de Limnoperna fortunei (Dunker 1857): taxas de filtração com ênfase ao uso de Cyanobacteria- DOI: 10.4025/actascibiolsci.v26i4.1523
Provedor de dados: 3
Autores: Ruckert, Gabriela Von; CETEC; Campos, Mônica de Cassia Souza; CETEC; Rolla, Maria Edith; CETEC.
Limnoperna fortunei é uma espécie invasora na América do Sul que, devido ao seu crescimento excessivo, tornou-se um sério problema para o ambiente e para os setores usuários de água bruta. L. fortunei é um molusco filtrador que se alimenta de fitoplâncton e outras partículas suspensas. Moluscos filtradores são grandes bioacumuladores de toxinas. Desta forma, L. fortunei apresenta um potencial de bioacumulação e transferência na cadeia trófica de cianotoxinas. Neste estudo, experimentos in vitro demonstraram que L. fortunei é capaz de alimentar-se de espécies de Cyanobacteria potencialmente tóxicas, Microcystis viridis e Pseudanabaena sp. As taxas de filtração foram 17,20 e 24,52mL.mgPS-1.h-1, respectivamente, sendo similares à encontrada para a Chlorophyta...
Palavras-chave: 2.01.00.00-0    Biologia Geral Limnoperna fortunei; Espécie invasora; Taxa de filtração; Cyanobacteria; Microcystis; Pseudanabena; Selenastrum 2.01.00.00-0    Biologia Geral.
Ano: 2004
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/1523

Drinking water: problems related to water supply in Bahía Blanca, Argentina
Provedor de dados: 40
Autores: Echenique,Ricardo; Giannuzzi,Leda; Ferrari,Luis.
In April 2000, alterations in drinking water quality, such as turbidity and odors similar to those of organochloride pesticides, were detected at Bahía Blanca (Argentina). This fact was associated to reports of dermic reactions and respiratory problems in the population. Samples drawn from Paso de las Piedras reservoir, two water treatment plants of at inlet and outlet points and at several particular houses were analyzed. Total phytoplankton in the reservoir varied between 49440 and 84832 cells.ml-1, while dominant species was, Anabaena circinalis. Efficiency to remove microorganisms (ER) by the treatment plants considering cell number of total phytoplankton was analyzed. Bacteriological analysis, qualitative and quantitative studies of phytoplankton,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyanobacteria; Phytoplankton; Blooms; Biogenic odour compounds.
Ano: 2006
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-37432006000200001

Phytoplankton abundance, dominance and coexistence in an eutrophic reservoir in the state of Pernambuco, Northeast Brazil
Provedor de dados: 42
Autores: Lira,Giulliari A. S. T.; Araújo,Elcida L.; Bittencourt-Oliveira,Maria Do Carmo; Moura,Ariadne N.
The present study reports the phytoplankton abundance, dominance and co-existence relationships in the eutrophic Carpina reservoir, Pernambuco, Brazil. Sampling was carried out at six different depths bimonthly at a single reservoir spanning two climatic periods: dry season (January, September, and November 2006) and rainy season (March, May, and July 2006). Density, abundance, dominance, specific diversity and equitability of the community were determined, along with chlorophyll a, and physical and chemical variables of the environment. Eight species were considered abundant, and their densities corresponded to more than 90% of the total phytoplankton community quantified. Cyanobacteria represented more than 80% of this density. Cylindrospermopsis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carpina reservoir; Cylindrospermopsis raciborskii; Cyanobacteria; Limnological characteristics; Phytoplankton structure; Vertical distribution.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400018

Seasonal changes of water quality in a tropical shallow and eutrophic reservoir in the metropolitan region of Recife (Pernambuco-Brazil)
Provedor de dados: 42
Autores: OLIVEIRA,FÁBIO H.P.C. DE; ARA,ANDRÉ L.S. CAPELA E; MOREIRA,CESAR H.P.; LIRA,OSMAN O.; PADILHA,MARIA DO ROSÁRIO F.; SHINOHARA,NEIDE K.S.
This study investigated the water quality in an urban eutrophic reservoir in Northeastern Brazil, considering the influence of seasonality. Monthly, samples were collected in the sub-surface reservoir. The following abiotic variables were analyzed: temperature, pH, dissolved oxygen, apparent color, turbidity, conductivity, fluoride, total nitrogen, chlorides, total dissolved solids, total hardness, iron, copper, manganese, aluminum, chlorophyll-a and phaeophytin. Total and thermotolerant coliforms were analyzed according to APHA (2012). Cyanobacteria density was quantified through its biomass. The data were analyzed using one- way ANOVA and Pearson correlation test. Higher values mean phytoplankton biomass (26.3mm3.L–1) occurred in the dry season,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coliforms; Cyanobacteria; Reservoir; Trophic state.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401863

Biogeochemical processes and the diversity of Nhecolândia lakes, Brazil
Provedor de dados: 42
Autores: Almeida,Teodoro I. R; Calijuri,Maria do Carmo; Falco,Patrícia B; Casali,Simone P; Kupriyanova,Elena; Paranhos Filho,Antonio C; Sigolo,Joel B; Bertolo,Reginaldo A.
The Pantanal of Nhecolândia, the world's largest and most diversified field of tropical lakes, comprises approximately 10,000 lakes, which cover an area of 24,000 km² and vary greatly in salinity, pH, alkalinity, colour, physiography and biological activity. The hyposaline lakes have variable pHs, low alkalinity, macrophytes and low phytoplankton densities. The saline lakes have pHs above 9 or 10, high alkalinity, a high density of phytoplankton and sand beaches. The cause of the diversity of these lakes has been an open question, which we have addressed in our research. Here we propose a hybrid process, both geochemical and biological, as the main cause, including (1) a climate with an important water deficit and poverty in Ca2+ in both superficial and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pantanal; Alkaline lakes; Saline lakes; Cyanobacteria; Alkalinization processes.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200004

Influence of water volume reduction on the phytoplankton dynamics in a semi-arid man-made lake: A comparison of two morphofunctional approaches
Provedor de dados: 42
Autores: BRAGA,GUSTAVO G.; BECKER,VANESSA.
Abstract  Significant reductions in the water levels of lakes are influenced by droughts and freshwater demands, especially in semi-arid regions, where hydric stress is greater. The aim of this study was to investigate the dynamics of phytoplankton during two different water volume periods resulting from an extended drought in a semi-arid lake. Another objective was to compare two functional approaches to test which one of these best captures phytoplankton variability as a function of environmental variability. Multivariate analyses performed using the Reynolds Functional Groups (RFG) and Morphology-Based Functional Groups (MBFG) classification schemes indicated two periods, high and a low water volume. The results demonstrated the importance of light...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydric deficit; Cyanobacteria; Eutrophication; Reynolds Functional Groups; Morphology-Based Functional Groups.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100707

Low water quality in tropical fishponds in southeastern Brazil
Provedor de dados: 42
Autores: COSTA,SIMONE M.; APPEL,ELEONORA; MACEDO,CARLA F.; HUSZAR,VERA L.M.
Expansion of aquaculture around the world has heavily impacted the environment. Because fertilizers are needed to raise fish, one of the main impacts is eutrophication, which lowers water quality and increases the frequency of algal blooms, mostly cyanobacteria. To evaluate whether the water quality in 30 fishponds in southeastern Brazilian met the requirements of Brazilian legislation, we analyzed biotic and abiotic water conditions. We expected that the high nutrient levels due to fertilization would cause low water quality. We also analyzed cyanotoxins in seston and fish muscle in some systems where cyanobacteria were dominant. The fishponds ranged from eutrophic and hypereutrophic with high phytoplankton biomass. Although cyanobacteria were dominant in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyanobacteria; Cyanotoxins; Eutrophication; Fish culture.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301181

A study of chlorophyll-like and phycobilin pigments in the C endosymbiont of the apple- snail Pomacea canaliculata
Provedor de dados: 47
Autores: Vega,Israel A.; Dellagnola,Federico A.; Hurst,Jorge A.; Godoy,Martín S.; Castro-Vazquez,Alfredo.
Pigments present in the brown-greenish C morph of an intracellular endosymbiont of Pomacea canaliculata were investigated. Acetone extracts of the endosymbiotic corpuscles showed an absorption spectrum similar to that of chlorophylls. Three fractions obtained from silica gel column chromatography of the acetone extracts (C I, C II and C III), were studied by positive ion fast atom bombardment-mass spectrometry (FAB-MS) and hydrogen-nuclear magnetic resonance (H-NMR). Results indicated the presence of (1) a sterol in the yellow colored C I fraction; (2) a mixture of pheophorbides a and b in the major green fraction, C II; and (3) a modified pheophorbide a in the smaller green fraction, C III. Aqueous extracts of the C endosymbiont did not show evidence of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Symbiosis; Cyanobacteria; Chloroplast; Photosynthetic pigments; Phylogeny.
Ano: 2012
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452012000200001

Cyanobacterial defense mechanisms against foreign DNA transfer and their impact on genetic engineering
Provedor de dados: 48
Autores: Stucken,Karina; Koch,Robin; Dagan,Tal.
Cyanobacteria display a large diversity of cellular forms ranging from unicellular to complex multicellular filaments or aggregates. Species in the group present a wide range of metabolic characteristics including the fixation of atmospheric nitrogen, resistance to extreme environments, production of hydrogen, secondary metabolites and exopolysaccharides. These characteristics led to the growing interest in cyanobacteria across the fields of ecology, evolution, cell biology and biotechnology. The number of available cyanobacterial genome sequences has increased considerably in recent years, with more than 140 fully sequenced genomes to date. Genetic engineering of cyanobacteria is widely applied to the model unicellular strains Synechocystis sp. PCC 6803...
Tipo: Journal article
Palavras-chave: Cyanobacteria; Genetic engineering; Defense mechanism; Restriction-modification.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000400009

Toxic cyanobacteria strains isolated from blooms in the Guadiana River (southwestern Spain)
Provedor de dados: 48
Autores: MORENO,ISABEL M; PEREIRA,PAULO; FRANCA,SUSANA; CAMEÁN,ANA.
This paper describes the occurrence of toxic cyanobacteria along the Guadiana River over its course between Mérida and Badajoz (Extremadura, Spain). Water sampling for phytoplankton quantification and toxin analysis was carried out regularly between 1999 and 2001 in six different locations, including two shallow, slow-flowing river sites, two streamed river sites and two drinking water reservoirs. The cyanobacterial community differed significantly between these locations, especially during the summer. The predominant genera were Microcystis, Oscillatoria, Aphanizomenon and Anabaena. Using an ELISA assay the total microcystin contents of natural water samples from the most eutrophic locations ranged from 0.10 _ 21.86 mg mcyst-LR equivalent·L-1 in...
Tipo: Journal article
Palavras-chave: Cyanobacteria; Microcystins; Guadiana; Spain.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000300006

The phytoplankton of Guanabara Bay, Brazil: I. historical account of its biodiversity
Provedor de dados: 49
Autores: Villac,Maria Célia; Tenenbaum,Denise Rivera.
This is a historical account of the biodiversity of phytoplankton in Guanabara Bay, Brazil. It is based on 57 publications that refer to sampling carried out between 1913 and 2004. The publications included are those with direct microscopic identification. Although 80% of the studies focus on ecological issues that tend to mention only the most abundant species, 24 publications provide comprehensive check-lists at the species level, especially of taxa &gt; 20 μm. The inventory of species includes, to date, 308 taxa among 199 diatoms, 90 dinoflagellates, 9 cyanobacteria, 5 euglenophyceans, 1 chlorophycean, 1 prasinophycean, 1 silicoflagellate, and 2 ebriids. The most conspicuous species were the dinoflagellate Scrippsiella trochoidea and diatoms from the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Marine microalgae; Diatoms; Dinoflagellates; Cyanobacteria; Algal blooms.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000200030

Lista de Cyanobacteria do Estado de São Paulo
Provedor de dados: 49
Autores: Sant'Anna,Célia Leite; Branco,Luis Henrique Zanini; Gama Júnior,Watson Arantes; Werner,Vera Regina.
Com base no levantamento bibliográfico realizado sobre as cianobactérias citadas para o Brasil e para o Estado de São Paulo em particular, além de consulta à lista de espécies da flora brasileira e aos bancos de dados de coleções paulistas, encontramos um total de 460 espécies citadas para o Brasil e 378 para o estado de São Paulo. Considerando que o grupo tem ao redor de 2800 espécies, estes números representam bem menos de 20% das espécies conhecidas. Assim, frente a diversidade de ambientes e habitats existentes nos biomas tropicais/subtropicais, o reduzido número de espécies já conhecidas indica que certamente essa biodiversidade está subestimada e deve ser muito maior do que identificamos até agora.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyanobacteria; Biota paulista; Programa BIOTA/FAPESP.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032011000500017

Inventory of benthic marine and estuarine algae and Cyanobacteria for Tabasco, México
Provedor de dados: 49
Autores: Mendoza-González,Angela Catalina; Mateo-Cid,Luz Elena; García-López,Deisy Yazmin.
Abstract Studies of benthic marine and estuarine algae as well as Cyanobacteria are in their early stages in the littoral of the state of Tabasco. Sixty seven taxa of seaweeds are currently known from Tabasco. The inventory of these organisms was made based on samples obtained in six localities, three of them in marine and three in estuarine environments. We found 147 species and subspecific taxa with Rhodophyta having the greatest number with 84, followed by Chlorophyta 44, and finally Phaeophyceae 19. In addition, the 26 species of Cyanobacteria collected are recorded for the first time for the coast of Tabasco since there are no previous reports. The presence of 115 species of benthic marine and estuarine algae is reported for the first time for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tabasco; Mexico; New records; Marine; Estuarine; Algae; Cyanobacteria.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032017000400303

Using distribution models to estimate blooms of phytosanitary cyanobacteria in Brazil
Provedor de dados: 49
Autores: Guimarães,Ariane; Silva,Pablo Henrique da; Carneiro,Fernanda Melo; Silva,Daniel Paiva.
Abstract: The multiple uses of aquatic ecosystems by humankind and the continuous interference of their activities have contributed to the emergence of potentially toxic cyanobacteria blooms. Here, we firstly created a database of occurrences of cyanobacteria blooms in Brazil through a systematic review of the scientific literature available in online platforms (e.g. Web of Science, Capes Thesis Catalogue). Secondly, we carried out ecological niche models with occurrence data obtained from these studies to predict climatically suitable areas for blooms. We select 21 bioclimatic variables input environmental data. We used five modeling methods for the current climate scenario: (1) Maxent; (2) Support Vector Machines; (3) Random Forest; (4) Maximum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freshwater ecosystems; Species distribution models; Bloom occurrence; Cyanobacteria.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032020000200202

Implementation of a risk management protocol for phycotoxins occurrence in the Baconao Lagoon, Santiago de Cuba
Provedor de dados: 50
Autores: Gómez Luna,Liliana; Zapata Palanqué,Alejandro; Corona Ochoa,Zelma Celia; Álvarez Arencibia,Yailyn; Bouza Alonso,José Antonio; Beyris Mazar,Alberto.
ABSTRACT The Baconao Lagoon is a tropical, coastal and littoral ecosystem which receives continuous natural and human perturbations; favoring the eutrophication process, and consequently, the phytoplankton proliferation. The starting point of this research begins with a massive fish kill report into the lagoon on May 2017, being the main objective to document the implementation of a risk management protocol for the phycotoxin presence, adapted to the ecosystem conditions, considering the characterization of the risk event, focusing on mitigation and prevention of negative impacts. The presence of a mix Harmful Algal Bloom (HAB) in remission was confirmed, with negative implications to the entire ecosystem. It was identified the presence of abundant motile...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyanobacteria; Harmful Algal Bloom (HAB); Gymnodinium sp.; Karlodinium micrum; Baconao Lagoon.
Ano: 2021
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000100043

Genome-Wide Assessment of Putative Superoxide Dismutases in Unicellular and Filamentous Cyanobacteria
Provedor de dados: 52
Autores: Prajapati,Rajesh; Yadav,Shivam; Mitra,Sonali; Rai,Priya; Mishra,Rajeev; Atri,Neelam.
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 the present study, we extracted information regarding SODs from species of sequenced cyanobacteria and investigated their diversity, conservation, domain structure, and evolution. 144 putative SOD homologs were identified. Unlike other protein families (ex. serine-threonine kinases) SODs are present in all cyanobacterial species reflecting their significant role in survival. However, their distribution...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Superoxide dismutases; Cyanobacteria; Comparative genomics; Phylogeny.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100422

Offshore distribution patterns of the cyanobacterium Trichodesmium erythraeum ehrenberg and associated phyto- and bacterioplankton in the southern Atlantic coast (Paraná, Brazil)
Provedor de dados: 52
Autores: Siqueira,Adriana; Kolm,Hedda Elisabeth; Brandini,Frederico Pereira.
Studies were carried out on Thrichodesmium erythraeum occurring on the inner shelf in the state of Paraná, Brazil. Temperature, salinity, rainfall, wind velocity, total bacteria, bacterial biomass, chlorophyll-a, phytoplankton, Anabaena sp., Merismopedia sp. and T. erythraeum densities were measured in surface water. Centric and pennate diatoms, Anabaena sp. and Merismopedia sp. were most abundant at 15 m isobath, while dinoflagellate abundance was relatively constant among stations. Similarly, total bacterial densities were relatively homogeneous throughout the sampling area, suggesting that blooms of T. erythraeum were not yet in the senescent phase. Results showed that T. erythraeum was capable of surviving in relatively inhospitable environmental...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trichodesmium erythraeum; Bloom; Cyanobacteria; Phytoplankton; South Brazil.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000300018

Genetic polymorphism in brazilian microcystis spp. (Cyanobacteria) toxic and non-toxic through RFLP-PCR of the cpcBA-IGS
Provedor de dados: 52
Autores: Bittencourt-Oliveira,Maria do Carmo; Cunha,Maristela Casé Costa; Moura,Ariadne do Nascimento.
The escalating occurrence of cyanobacterial toxic blooms demands a better understanding of genetic variability as an auxiliary expedient in species identification, collaborating with the monitoring of water destined to public supply. This study aimed at the unraveling of genetic polymorphism in the toxic and nontoxic strains of Microcystis (Cyanobacteria) species, isolated from diverse Brazilian localities through the RFLP-PCR technique applied to the c-phycocyanin encoding operon and its intergenic spacer (cpcBA-IGS). Eighteen strains belonging to M. aeruginosa, M. panniformis, M. protocystis and M. wesenbergii, plus two other unidentified strains, were analyzed by means of the morphological and molecular data. The molecular data constituted three groups...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyanobacteria; CpcBA-IGS; Genetic polymorphism; Microcystin; Microcystis; RFLP.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000400014

Arsenic tolerance of Microcystis novacekii (Komárek-Compère, 1974) and its arsenic decontamination potential
Provedor de dados: 52
Autores: Ferreira,Fernanda Aires Guedes; Franco,Maione Wittig; Oliveira,Dirce Maria De; Magalhães,Sérgia Maria Starling; Barbosa,Francisco Antônio Rodrigues.
ABSTRACT Cyanobacteria possess metallic ion interaction properties that should be explored with the aim of recovering arsenic (As) contaminated areas. Contamination of As is an issue of worldwide concern due to the risk of human chronic intoxication and negative environmental health effects. In this study the potential decontamination of As(III) and As(V) using cyanobacteria cultures was assessed. Microcystis novacekii (Komárek-Compere, 1974) showed normal growth in concentrations of As(V) similar to those found in natural environments contaminated with As, demonstrating its resistance to As(V). Growth rates gradually decreased upon exposure to high As(V) concentrations from 600 to 5630 mg.L-1 while As(III) affected growth from 14.7 - 85.7 mg.L-1. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arsenic; Cyanobacteria; Bioaccumulation; Toxicity; Growth rates.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000100414

Biochemical composition of seven species of cyanobacteria isolated from different aquatic habitats of Western Ghats, Southern India
Provedor de dados: 52
Autores: Rajeshwari,Karanth Rama; Rajashekhar,Madaiah.
The aim of this work was to study the biochemical constituents of seven species of cyanobacteria namely, Calothrix fusca, Gloeocapsa livida, Lyngbya limnetica and Scytonema bohneri isolated from Panekal sulfur spring. The species namely, Oscillatoria acuminata from petrochemical refinery, O. calcuttensis from dairy effluent and O. foreaui from a sewage drain located in the Western Ghats of Southern India under laboratory culture conditions. The biochemical constituents were analyzed in terms of total carbohydrates, total protein, total free amino acid, total lipid, fatty acid and mineral contents. The analysis showed that maximum amount of total carbohydrate in S. bohneri (28.4% dry weight) and minimum in O. foreaui (8.0% of dry weight). Maximum amount of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyanobacteria; Polluted waters; Sulfur spring; Biochemical constituents.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000500001

Evaluation of cytotoxicity and biological activities in extracellular polysaccharides released by cyanobacterium Arthrospira platensis
Provedor de dados: 52
Autores: Challouf,Rafika; Trabelsi,Lamia; Ben Dhieb,Rym; El Abed,Omeya; Yahia,Ali; Ghozzi,Khamissa; Ben Ammar,Jihen; Omran,Hela; Ben Ouada,Hatem.
The aim of this work was to evaluate the cytotoxicity of Arthrospira platensis Extracellular Polymeric Substances (EPS) for colon cancer and kidney cell lines. Results showed that EPS were free from cytotoxic effects. A variety of solvents were assessed for their ability to extract the bioactive ingredients from EPS. Methanol gave the highest yield (75.75%) than other solvents. The extracts were tested for activities against a collection of Gram+/- bacteria. The methanol extract exhibited a more potent activity than the other organic extracts, whereas the aqueous extract was active against Staphylococcus epidermis (Gram+) and Salmonella typhimurium (Gram-). Finally, The extracts were also tested for the antioxidant activity, using the Trolox Equivalent...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyanobacteria; Exoplysaccharides; Cytotoxicity; Antibacterial; Antioxidant; Activity.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000400024

Cyanobacterial toxins in Portugal: effects on aquatic animals and risk for human health
Provedor de dados: 56
Autores: Vasconcelos,V.M.
Toxic cyanobacteria are common in Portuguese freshwaters and the most common toxins are microcystins. The occurrence of microcystin-LR (MCYST-LR) has been reported since 1990 and a significant number of water reservoirs that are used for drinking water attain high levels of this toxin. Aquatic animals that live in eutrophic freshwater ecosystems may be killed by microcystins but in many cases the toxicity is sublethal and so the animals can survive long enough to accumulate the toxins and transfer them along the food chain. Among these, edible mollusks, fish and crayfish are especially important because they are harvested and sold for human consumption. Mussels that live in estuarine waters and rivers where toxic blooms occur may accumulate toxins without...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyanobacteria; Toxins; Risk; Human health; Microcystins; Accumulation.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000300001

The leaves of green plants as well as a cyanobacterium, a red alga, and fungi contain insulin-like antigens
Provedor de dados: 56
Autores: Silva,L.B.; Santos,S.S.S.; Azevedo,C.R.; Cruz,M.A.L.; Venâncio,T.M.; Cavalcante,C.P.; Uchôa,A.F.; Astolfi Filho,S.; Oliveira,A.E.A.; Fernandes,K.V.S.; Xavier-Filho,J.
We report the detection of insulin-like antigens in a large range of species utilizing a modified ELISA plate assay and Western blotting. We tested the leaves or aerial parts of species of Rhodophyta (red alga), Bryophyta (mosses), Psilophyta (whisk ferns), Lycopodophyta (club mosses), Sphenopsida (horsetails), gymnosperms, and angiosperms, including monocots and dicots. We also studied species of fungi and a cyanobacterium, Spirulina maxima. The wide distribution of insulin-like antigens, which in some cases present the same electrophoretic mobility as bovine insulin, together with results recently published by us on the amino acid sequence of an insulin isolated from the seed coat of jack bean (Canavalia ensiformis) and from the developing fruits of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insulin; Insulin-like; Antigens; Evolution; Plants; Cyanobacteria; Algae; Fungi.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002000300004

Temporal assessment of microbial communities in soils of two contrasting mangroves
Provedor de dados: 58
Autores: Rigonato,Janaina; Kent,Angela D.; Gumiere,Thiago; Branco,Luiz Henrique Zanini; Andreote,Fernando Dini; Fiore,Marli Fátima.
ABSTRACT Variations in microbial communities promoted by alterations in environmental conditions are reflected in similarities/differences both at taxonomic and functional levels. Here we used a natural gradient within mangroves from seashore to upland, to contrast the natural variability in bacteria, cyanobacteria and diazotroph assemblages in a pristine area compared to an oil polluted area along a timespan of three years, based on ARISA (bacteria and cyanobacteria) and nifH T-RFLP (diazotrophs) fingerprinting. The data presented herein indicated that changes in all the communities evaluated were mainly driven by the temporal effect in the contaminated area, while local effects were dominant on the pristine mangrove. A positive correlation of community...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mangrove; Cyanobacteria; Diazotrophs; Oil contamination; NifH T-RFLP; ARISA.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000100087

A toxic cyanobacterial bloom in an urban coastal lake, Rio Grande do Sul state, Southern Brazil
Provedor de dados: 58
Autores: Carvalho,Luciana Retz de; Pipole,Fernando; Werner,Vera Regina; Laughinghouse IV,Haywood Dail; Camargo,Antonio Carlos M. de; Rangel,Marisa; Konno,Katsuhiro; Sant' Anna,Célia Leite.
Reports of cyanobacterial blooms developing worldwide have considerably increased, and, in most cases, the predominant toxins are microcystins. The present study reports a cyanobacterial bloom in Lake Violão, Torres, Rio Grande do Sul State, in January 2005. Samples collected on January 13, 2005, were submitted to taxonomical, toxicological, and chemical studies. The taxonomical analysis showed many different species of cyanobacteria, and that Microcystis protocystis and Sphaerocavum cf. brasiliense were dominant. Besides these, Microcystis panniformis, Anabaena oumiana,Cylindrospermopsis raciborskii, and Anabaenopsis elenkinii f. circularis were also present. The toxicity of the bloom was confirmed through intraperitoneal tests in mice, and chemical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyanobacteria; Blooms; Anabaenopeptins; Microcystins.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822008000400031

Effects of monosulfuron-ester on metabolic processes of nitrogen-fixing cyanobacteria Anabaena flos-aquae and Anabaena azotica
Provedor de dados: 58
Autores: Shen,Jian Ying; Liao,Jin Zhi; Guo,Li Li; Su,Rui Fang.
Abstract Presence of the relatively new sulfonylurea herbicide monosulfuron-ester at 0.03-300 nmol/L affected the growth of two non-target nitrogen-fixing cyanobacteria (Anabaena flos-aquae and Anabaena azotica) and substantially inhibited in vitro Acetolactate synthase activity, with IC50 of 3.3 and 101.3 nmol/L for A. flos-aquae and A. azotica, respectively. Presenting in 30-300 nmol/L, it inhibited protein synthesis of the cyanobacteria with less amino acids produced as its concentration increased. Our findings support the view that monosulfuron-ester toxicity in both nitrogen-fixing cyanobacteria is due to its interference with protein metabolism via inhibition of branch-chain amino acid biosynthesis, and particularly Acetolactate synthase activity.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acetolactate synthase; Amino acids; Cyanobacteria; Monosulfuron-ester.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822017000300544

Degradation of textile dyes by cyanobacteria
Provedor de dados: 58
Autores: Dellamatrice,Priscila Maria; Silva-Stenico,Maria Estela; Moraes,Luiz Alberto Beraldo de; Fiore,Marli Fátima; Monteiro,Regina Teresa Rosim.
Abstract Dyes are recalcitrant compounds that resist conventional biological treatments. The degradation of three textile dyes (Indigo, RBBR and Sulphur Black), and the dye-containing liquid effluent and solid waste from the Municipal Treatment Station, Americana, São Paulo, Brazil, by the cyanobacteria Anabaena flos-aquae UTCC64, Phormidium autumnale UTEX1580 and Synechococcus sp. PCC7942 was evaluated. The dye degradation efficiency of the cyanobacteria was compared with anaerobic and anaerobic-aerobic systems in terms of discolouration and toxicity evaluations. The discoloration was evaluated by absorption spectroscopy. Toxicity was measured using the organisms Hydra attenuata, the alga Selenastrum capricornutum and lettuce seeds. The three...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dyes; Toxicity; Discoloration; Cyanobacteria; Degradation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822017000100025