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Registros recuperados: 37
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Blue-green algae and rice International Rice Research Institute
Roger, R.A.; Kulasooriya, S.A..
112 p. : ill.
Tipo: Book Palavras-chave: Cyanobacteria; Ecoogy; Nitrogen fixation; Soil.
Ano: 1980 URL: http://hdl.handle.net/10269/209
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Standardization of the plating method for the enumeration of blue-green algae in wetland rice soils - its application in the study of some soils in the Philippines International Rice Research Institute
Santiago, Susan T..
53 l. : ill. Thesis (M.S.) -- University of the Philippines at Los Baños
Tipo: Thesis Palavras-chave: Cyanobacteria; Rice soils; Plant density; Wetland soils; Research methods; Philippines.
Ano: 1986 URL: http://hdl.handle.net/123456789/1367
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Biofertilizer germplasm collections at IRRI International Rice Research Institute
Watanabe, I.; Roger, P.A.; Ladha, J.K.; Hove, C. van.
66 p. : ill.
Tipo: Book Palavras-chave: Biofertilizers; Germplasm collections; Azolla; Cyanobacteria; Rhizobia; Nitrogen-fixing bacteria; IRRI.
Ano: 1992 URL: http://hdl.handle.net/10269/206
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Biofertilizer germplasm collections at IRRI International Rice Research Institute
Watanabe, I.; Roger, P. A.; Ladha, J. K.; Van Hove, C.
66 p. :ill.
Tipo: Book Palavras-chave: Biofertilizers; Azolla; Germplasm; IRRI; Cyanobacteria; Nitrogen fixing bacteria; Rhizobium.
Ano: 1992 URL: http://hdl.handle.net/10269/30
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Algas planctônicas do reservatório da Pampulha (MG): Euglenophyta, Chrysophyta, Pyrrophyta, Cyanobacteria Rev. Bras. Bot.
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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Hepatosplenomegaly caused by an extract of cyanobacterium Microcystis aeruginosa bloom collected in the Manguaba Lagoon, Alagoas - Brazil Rev. Microbiol.
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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Algae and cyanobacteria on painted surfaces in Southern Brazil Rev. Microbiol.
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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Донные цианобактерии в континентальных гиперсоленых озерах Крыма: предварительное сообщение IBSS Repository
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
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Plankton community composition in relation to availability and uptake of oxidized and reduced nitrogen ArchiMer
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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Alimentação de Limnoperna fortunei (Dunker 1857): taxas de filtração com ênfase ao uso de Cyanobacteria- DOI: 10.4025/actascibiolsci.v26i4.1523 Biological Sciences
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
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Toxic cyanobacteria strains isolated from blooms in the Guadiana River (southwestern Spain) Biol. Res.
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
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Evaluating nitrogen transfer efficiency of immobilized cyanobacteria to rice seedlings by 15N technique International Rice Research Institute
Balachandar, D.; Kumar, K.; Kannaiyan, S.; Arulmozhiselvan, K..
p.53-54
Palavras-chave: Cyanobacteria; Anabaena azollae; Nostoc muscorum; Immobilization; Nitrogen; Nitrogen content; Nutrient uptake; Urea.
Ano: 2004 URL: http://hdl.handle.net/123456789/773
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Drinking water: problems related to water supply in Bahía Blanca, Argentina Acta Toxicol. Argent.
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
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Bioactivity of Scytonema hofmanni (Cyanobacteria) in Lilium alexandrae in vitro propagation Electron. J. Biotechnol.
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
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Stimulation of nitrogen-fixing cyanobacteria in a Baltic Sea plankton community by land-derived organic matter or iron addition ArchiMer
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 > 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
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Cyanobacterial populations that build 'kopara' microbial mats in Rangiroa, Tuamotu Archipelago, French Polynesia ArchiMer
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
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Experimental and bioinformatic approaches for analyzing and visualizing cyanobacterial nitrogen and hydrogen metabolism Electron. J. Biotechnol.
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
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Cyanophyta del Parque Nacional Nahuel Huapi (Argentina), II Darwiniana
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
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Региональный алгоритм расчёта концентрации хлорофилла а в Чёрном море по спутниковым данным SeaWiFS. IBSS Repository
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
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Design and application of a stratified sampling strategy to study the regional distribution of cyanobacteria (Ile-de-France, France) ArchiMer
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
Registros recuperados: 37
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