Biological Nitrogen Fixing
Mostrando 13-24 de 38 artigos, teses e dissertações.
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13. CIANOBACTÉRIAS HETEROCITADAS E EUGLENAS VERMELHAS EM LAVOURA DE ARROZ IRRIGADO POR INUNDAÇÃO EM PLANOSSOLO HÁPLICO, SANTA MARIA, RS / HETEROCITIC CYANOBACTERIA AND RED EUGLENOPHYCEAE IN FLOODED RICE AGROECOSYSTEM
As reações de oxiredução decorrentes da inundação em lavoura de arroz irrigado promovem uma maior disponibilidade de nutrientes, oriundos da aplicação de fertilizantes, na solução do solo. Embora o manejo de drenagem inicial, necessário para o melhor estabelecimento das plântulas, contribua para a perda de fertilidade nesses agroecossistemas, eve
Publicado em: 2010
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14. Soil fauna, arbuscular mycorrhizal fungi and diazotrophic bacteria in Areas of Mining of Bauxite in the Northwest Pará revegetated with palm oil. / Fauna do Solo, Fungos Micorrízicos Arbusculares e Bactérias Diazotróficas em Áreas de Mineração de Bauxita no Noroeste do Pará Revegetadas com Dendê.
The Mining is considered the activity can cause a great impact in the environment, involving the vegetation and subsoil layers remove. After the finish of mineral sources, mandatorily these areas require recovery measures. This study aimed to evaluate the initial establishment of three genotypes of palm oil: C2501, C2301 and C2528, indicated by Embrapa Amaz�
Publicado em: 2009
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15. Genetic diversity and symbiotic efficiency of nitrogen-fixing cowpea nodulating bacteria isolated from soils under agricultural cultivation in the Western Amazon / Diversidade genética e eficiência simbiótica de estirpes de bactérias que nodulam feijão-caupi isoladas de solos sob cultivo agrícola na Amazônia Ocidental
Este trabalho foi realizado com o objetivo de avaliar a diversidade genética e eficiência simbiótica de bactérias que nodulam feijão-caupi, isoladas de solos sob cultivo agrícola na Amazônia Ocidental. Os isolados do presente trabalho foram obtidos em trabalho anterior, a partir de uma coleção de 1010 isolados oriundos diferentes sistemas de uso, qu
Publicado em: 2009
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16. Avaliação da funcionalidade do solo em sistemas florestais enriquecidos com leguminosas. / Evaluation of soil functionality in forest systems enriched with leguminous trees.
The study was conducted in an area of abandoned pasture, originally under the cover of the Atlantic Forest, to evaluate the process of succession and restoration of degraded areas. The area was located in Valença municipality, State of Rio de Janeiro Brazil. In 2001 it was conducted a planting of nitrogen fixing leguminous trees in different proportions: 0%
Publicado em: 2009
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17. Hipótese evolutiva sobre a assimilição de compostos nitrogenados por metazoários: a limitação α-aminoácidos / Evolutionary hypothesis on the nitrogenous compounds uptake by metazoan: the limitation to α-aminoacids
Metabolic pathway evolution models are molecular and computational based, and do not take account the physiological and ecological contexts in which organisms are inserted. Thus using the nitrogen metabolism as a platform, an evolutionary hypothesis on the α-amino acids utilization by metazoans was proposed. The objective of the present work is to trace
Publicado em: 2008
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18. Influência do lodo de esgoto na nodulação e no desenvolvimento do Caupi (Vigna unguiculata "L" Walp)
The intense urban growth, production of domestic and industrial residues has been increased, mainly sewage sludge. This residue has high amount of pathogenic organisms and heavy metals. The viable alternative for this residue destination is its use in agriculture improving the chemical, physical and biological soil characteristics. Allied of the capacity of
Publicado em: 2007
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19. INITROGEN FIXATION BY DIAZOTROPHIC BACTERIA IN FLOODED RICE CULTIVARS / FIXAÇÃO DE NITROGÊNIO POR BACTÉRIAS DIAZOTRÓFICAS EM CULTIVARES DE ARROZ IRRIGADO
Rice is a very important culture in the South of Brazil, with productivity mean of 6 t ha-1, requiring large amounts of nitrogen. The biological nitrogen fixation (BNF) has already been established for legumes and in gramineous plants, microrganisms of the genus Azospirillum, Herbaspirillum, Gluconacetobacter and Burkholderia have potential to BNF and growth
Publicado em: 2006
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20. Effect of Interactions Among Algae on Nitrogen Fixation by Blue-Green Algae (Cyanobacteria) in Flooded Soils
Nitrogen fixation (C2H2 reduction) by algae in flooded soil was limited by interactions within the algal community. Nitrogen fixation by either indigenous algae or Tolypothrix tenuis was reduced severalfold by a dense suspension of the green alga Nephrocytium sp. Similarly, interactions between the nitrogen-fixing alga (cyanobacterium) Aulosira 68 and natura
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21. Hopanoid lipids compose the Frankia vesicle envelope, presumptive barrier of oxygen diffusion to nitrogenase.
Biological nitrogen fixation in aerobic organisms requires a mechanism for excluding oxygen from the site of nitrogenase activity. Oxygen exclusion in Frankia spp., members of an actinomycetal genus that forms nitrogen-fixing root-nodule symbioses in a wide range of woody Angiosperms, is accomplished within specialized structures termed vesicles, where nitro
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22. Remote analysis of biological invasion and biogeochemical change
We used airborne imaging spectroscopy and photon transport modeling to determine how biological invasion altered the chemistry of forest canopies across a Hawaiian montane rain forest landscape. The nitrogen-fixing tree Myrica faya doubled canopy nitrogen concentrations and water content as it replaced native forest, whereas the understory herb Hedychium gar
National Academy of Sciences.
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23. THE ELECTION TRANSPORT SYSTEM IN NITROGEN FIXATION BY Azotobacter, I. AZOTOFLAVIN AS AN ELECTRON CARRIER*
A flavoprotein, named azotoflavin, was isolated from an extract of Azotobacter vinelandii cells, which linked the reducing power generated by illuminated spinach chloroplasts to the Azotobacter nitrogen-fixing enzyme complex. The photoreduction of the yellow azotoflavin by chloroplasts produced a stable, free-radical semiquinone, blue in color, with properti
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24. Nitrogen-Fixing Pseudomonads Isolated from Roots of Plants Grown in the Canadian High Arctic
Root-associated bacteria capable of reducing acetylene to ethylene (biological nitrogen fixation) were isolated from various native plants grown in the Canadian High Arctic. All the strains belonged to the genus Pseudomonas but varied in several physiological characteristics. The rates of acetylene reduction at 14 or 20°C were higher than at 25 or 9°C. Six