Nostoc
Mostrando 13-24 de 132 artigos, teses e dissertações.
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13. Novas morfoespécies aerofíticas de Nostoc (Cyanobacteria) do Estado de São Paulo, Brasil
Ambientes aeroffticos brasileiros são quase totalmente desconhecidos em relação à sua flora de cianobactéria. Durante o estudo desta flora, três morfoespécies do gênero Nostoc foram encontradas em diferentes habitats do Estado de São Paulo, Brasil. Com base na morfologia, especialmente na formação e forma dos acinetos, no ciclo de vida e na ecolog
Hoehnea. Publicado em: 2007
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14. Levantamento da comunidade de cianobactérias em trechos do Rio Turvo Sujo, localizados nas proximidades da cidade de Viçosa, MG / Cyanobacteria community survey in areas of the Turvo Sujo River, located in the proximities of the city of Vicosa, MG
Water quality found in several regions of the world have revealed the neglectance in which industrial, urban and agricultural discharges have been treated which leads, constantly, to the accelerated growth of cyanobacteria strains. The aim of this study was to assess the occurrence of cyanobacteria in the Turvo Sujo River, one of the responsible rivers for t
Publicado em: 2007
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15. Isolamento, morfologia, análises moleculares e testes toxicológicos de cianobactérias em lagoa facultativa de sistema de estabilização (Cajati-SP) / Isolation, morphology, molecular analyses and toxicology assays of cyanobacteria from facultative pond of waste stabilization (Cajati-SP)
Os sistemas de lagoas de estabilização constituem uma tecnologia de tratamento de esgoto atraente para pequenas e médias comunidades, principalmente devido ao baixo custo, simplicidade operacional e boa eficiência de remoção de poluentes orgânicos e patógenos. Entretanto, apresentam elevadas concentrações de algas, cianobactérias e outras bactéri
Publicado em: 2007
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16. Pontencial de cianobactérias para a biorremediação de águas e solos contaminados por arsênio / Potential of cyanobacteria for bioremediation of arsenic- contaminated water and soil
A contaminação de ambientes por arsênio (As) é uma ameaça cada vez mais presente nos ecossistemas aquáticos, especialmente aqueles próximos às áreas de mineração. Utilizando a capacidade de alguns microrganismos para tolerar e, ou, absorver contaminantes, muitos pesquisadores têm-se preocupado com esse problema. Estudos de técnicas de biorremedi
Publicado em: 2007
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17. Effect of cyanobacteria and eukaryotic algae on the resistance of tobacco plants against Tobacco mosaic virus / Efeito de cianobactérias e algas eucarióticas na resistência de plantas de fumo contra o Tobacco mosaic virus (TMV)
Algae produce several different compounds that show biological activity, including ones with antiviral activity or that act as phytoalexin inducers. Thus, it was investigated the reduction of Tobacco mosaic virus (TMV) symptoms on tobacco plants treated with cyanobacteria or eukaryotic algae, and it was studied the way of action of algae on the studied patho
Publicado em: 2006
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18. Análise morfológica e molecular de cianobactérias isoladas de efluentes de uma mina de urânio desativada com ênfase em Aphanothece e sua capacidade de biossorção do 226Ra / Morphological and molecular analysis of cyanobacteria isolated from a deactivated uranium mine effuents with emphasis in Aphanothece and its 226Ra biosorption capacity
Cyanobacteria are oxygenic photosynthetic microorganisms with wide metabolic and structural plasticity, which have biotechnological potential for exploration in metals biosorption and organic pollutants biodegradation. Due to its strong interactions with cations and a reliable supply of cheap biomass, cyanobacteria may be a promising biosorbent candidate for
Publicado em: 2006
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19. Efeito das cianobactérias Synechococcus leopoliensis e nostoc sp. sobre Colletotrichum sublineolum e na interação do patógeno com plantas de sorgo
Entre os patógenos que provocam perdas na cultura de sorgo (Sorghum bicolor), Colletotrichum sublineolum, agente causal da antracnose, é tido como um dos principais problemas. Com o objetivo de buscar medidas alternativas para o controle da doença, testou-se o efeito de duas cianobactérias, Synechococcus leopoliensis e Nostoc sp., sobre o fitopatógeno e
Fitopatologia Brasileira. Publicado em: 2002-04
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20. Occurrence and Localization of Phycoerythrin in Symbiotic Nostoc of Cycas revoluta and in the Free-Living Isolated Nostoc 7422 1
The phycobiliprotein phycoerythrin was localized in symbiotic and free-living Nostoc of the cycad Cycas using immunocytochemistry. In symbiotic Nostoc, phycoerythrin was associated with the thylakoid membranes of vegetative cells and absent from heterocysts. Similar cellular/subcellular localization was observed between symbiotic Nostoc and the free-living C
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21. Discovery of Rare and Highly Toxic Microcystins from Lichen-Associated Cyanobacterium Nostoc sp. Strain IO-102-I
The production of hepatotoxic cyclic heptapeptides, microcystins, is almost exclusively reported from planktonic cyanobacteria. Here we show that a terrestrial cyanobacterium Nostoc sp. strain IO-102-I isolated from a lichen association produces six different microcystins. Microcystins were identified with liquid chromatography-UV mass spectrometry by their
American Society for Microbiology.
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22. Genetic Diversity of Nostoc Symbionts Endophytically Associated with Two Bryophyte Species
The diversity of the endophytic Nostoc symbionts of two thalloid bryophytes, the hornwort Anthoceros fusiformis and the liverwort Blasia pusilla, was examined using the tRNALeu (UAA) intron sequence as a marker. The results confirmed that many different Nostoc strains are involved in both associations under natural conditions in the field. The level of Nosto
American Society for Microbiology.
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23. Regulation of expression of glutamine synthetase in a symbiotic Nostoc strain associated with Anthoceros punctatus.
A characteristic of N2-fixing cyanobacteria in symbiotic associations appears to be release of N2-derived NH4+. The specific activity of the primary ammonium-assimilating enzyme, glutamine synthetase (GS), was found to be three- to fourfold lower in Nostoc sp. strain 7801 grown in symbiotic association with the bryophyte Anthoceros punctatus than in free-liv
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24. Chlorophyll-Protein Complexes of the Cyanophyte, Nostoc sp. 1
Four chlorophyll-protein complexes have been resolved from the cyanophyte, Nostoc sp., by sodium dodecyl sulfate (SDS) polyacrylamide gel electrophoresis at 4 C. Complexes solubilized by SDS from Spinacia oleracea were run for comparison. As has been well documented, the P700-chlorophyll a-protein complex from the higher plant and blue-green algal samples ar