Diazotroph Organisms
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. OrfatrAb - Caracterização molecular do gene que codifica um ativador de transcrição da família LysR em Azospirillum brasilense / OrfatrAb - Molecular characterization of one transcription activator coding gene of the LysR family in Azospirillum brasilense
O nitrogênio, elemento-chave na composição de diversas biomoléculas como aminoácidos e ácidos nucléicos, é abundante na atmosfera, onde, sob forma de N2, não está disponível para a maioria dos seres vivos. Entretanto, existem microrganismos, chamados de diazotróficos, que são capazes de converter o nitrogênio atmosférico em formas assimilávei
Publicado em: 2010
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2. 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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3. Molecular Analysis of Diazotroph Diversity in the Rhizosphere of the Smooth Cordgrass, Spartina alterniflora
N2 fixation by diazotrophic bacteria associated with the roots of the smooth cordgrass, Spartina alterniflora, is an important source of new nitrogen in many salt marsh ecosystems. However, the diversity and phylogenetic affiliations of these rhizosphere diazotrophs are unknown. Denaturing gradient gel electrophoresis (DGGE) of PCR-amplified nifH sequence se
American Society for Microbiology.
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4. Physiological Diversity of the Rhizosphere Diazotroph Assemblages of Selected Salt Marsh Grasses
Rhizosphere diazotroph assemblages of salt marsh grasses are thought to be influenced by host plant species and by a number of porewater geochemical parameters. Several geochemical variables can adversely affect plant productivity and spatial distributions, resulting in strong zonation of plant species and growth forms. This geochemically induced stress may
American Society for Microbiology.
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5. Persistence of Selected Spartina alterniflora Rhizoplane Diazotrophs Exposed to Natural and Manipulated Environmental Variability
Rhizoplane-rhizosphere nitrogen-fixing microorganisms (diazotrophs) are thought to provide a major source of biologically available nitrogen in salt marshes dominated by Spartina alterniflora. Compositional and functional stability has been demonstrated for this important functional group; however, the quantitative responses of specific diazotroph population
American Society for Microbiology.
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6. PCR Analysis of the Distribution of Unicellular Cyanobacterial Diazotrophs in the Arabian Sea
An oligonucleotide primer, NITRO821R, targeting the 16S rRNA gene of unicellular cyanobacterial N2 fixers was developed based on newly derived sequences from Crocosphaera sp. strain WH 8501 and Cyanothece sp. strains WH 8902 and WH 8904 as well as several previously described sequences of Cyanothece sp. and sequences of intracellular cyanobacterial symbionts
American Society for Microbiology.
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7. Identification of Three Genes Encoding PII-Like Proteins in Gluconacetobacter diazotrophicus: Studies of Their Role(s) in the Control of Nitrogen Fixation
In our studies on the regulation of nitrogen metabolism in Gluconacetobacter diazotrophicus, an endophytic diazotroph of sugarcane, three glnB-like genes were identified and their role(s) in the control of nitrogen fixation was studied. Sequence analysis revealed that one PII protein-encoding gene, glnB, was adjacent to a glnA gene (encoding glutamine synthe
American Society for Microbiology.
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8. mRNA Extraction and Reverse Transcription-PCR Protocol for Detection of nifH Gene Expression by Azotobacter vinelandii in Soil
The study of free-living nitrogen-fixing organisms in bulk soil is hampered by the great diversity of soil microbial communities and the difficulty of relating nitrogen fixation activities to individual members of the diazotroph populations. We developed a molecular method that allows analysis of nifH mRNA expression in soil in parallel with determinations o
American Society for Microbiology.