Nitrifiers
Mostrando 1-12 de 43 artigos, teses e dissertações.
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1. Interacao entre microrganismos do solo, feijoeiro e milho em monocultura ou consorcio.
Os sistemas de cultivo afetam a microbiota do solo e, neste estudo, procurou-se investigar algumas interacoes entre microrganismos de importancia agricola e o feijoeiro (Phaseolus vulgaris) e milho (Zea mays) em monocultura ou consorcio. Em condicoes controladas, tanto os exsudatos de feijao como os de milho estimularam a sobrevivencia, o crescimento e a ind
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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2. Otimização tecnológica de estações de tratamento biológico (ETB) de águas residuárias de coqueria
The treatment of effluents in a coke industry occurs generally by activated sludge process. The operation and efficiency of the process depends on a large number of factors including chemical composition, quantity of the effluents, mass and composition of the activated sludge, environmental temperature, precipitation, solar radiation, dissolved oxygen, and h
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/05/2005
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3. Variation in Heterotrophic and Autotrophic Nitrifier Populations in Relation to Nitrification in Organic Soils †
The occurrence of heterotrophic and autotrophic nitrifiers in Pahokee muck and the role of these organisms in the ecosystem were assessed by surveying their population densities under different field conditions and by observing the relationship of these populations with aerobic bacteria and soil moisture. Heterotrophic nitrifier populations varied from 2.0 �
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4. Inhibition of Nitrifiers and Methanotrophs from an Agricultural Humisol by Allylsulfide and Its Implications for Environmental Studies
Allylsulfide, an inhibitor of ammonia monooxygenase, was tested to determine its ability to inhibit nitrification and methane oxidation in pure cultures, in agricultural humisol enrichment cultures, and in humisol slurries. We confirmed that allylsulfide is a differential inhibitor of cultures of nitrifiers and methanotrophs at concentrations of 1 and 200 μ
American Society for Microbiology.
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5. Relative Rates of Nitric Oxide and Nitrous Oxide Production by Nitrifiers, Denitrifiers, and Nitrate Respirers
Biogenic emissions of nitric and nitrous oxides have important impacts on the photochemistry and chemistry of the atmosphere. Although biogenic production appears to be the overwhelming source of N2O, the magnitude of the biogenic emission of NO is very uncertain. In soils, possible sources of NO and N2O include nitrification by autotrophic and heterotrophic
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6. Nitrification in histosols: a potential role for the heterotrophic nitrifier.
Insufficient populations of Nitrosomonas and Nitrobacter were found in a Pahokee muck soil (Lithic medidaprit) to account for the nitrate concentration observed. To determine if heterotrophic nitrifiers could account for some of this discrepancy, a method was developed to measure the levels of heterotrophic nitrifiers in soil. A population of 4.1 X 10(5) Art
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7. Population Ecology of Nitrifiers in a Stream Receiving Geothermal Inputs of Ammonium
The distribution, activity, and generic diversity of nitrifying bacteria in a stream receiving geothermal inputs of ammonium were studied. The high estimated rates of benthic nitrate flux (33 to 75 mg of N · m−2 · h−1) were a result of the activity of nitrifiers located in the sediment. Nitrifying potentials and ammonium oxidizer most probable numbers
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8. Detection of ammonium-oxidizing bacteria of the beta-subclass of the class Proteobacteria in aquatic samples with the PCR.
The PCR was used as the basis for the development of a sensitive and specific assay for the detection of ammonium-oxidizing bacteria belonging to the beta-subclass of the class Proteobacteria. PCR primers were selected on the basis of nucleic acid sequence data available for seven species of nitrifiers in this subclass. The specificity of the ammonium oxidiz
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9. Contribution of Methanotrophic and Nitrifying Bacteria to CH4 and NH4+ Oxidation in the Rhizosphere of Rice Plants as Determined by New Methods of Discrimination
Methanotrophic and nitrifying bacteria are both able to oxidize CH4 as well as NH4+. To date it is not possible to estimate the relative contribution of methanotrophs to nitrification and that of nitrifiers to CH4 oxidation and thus to assess their roles in N and C cycling in soils and sediments. This study presents new options for discrimination between the
American Society for Microbiology.
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10. Nitrate Accumulation in Aerobic Hypolimnia: Relative Importance of Benthic and Planktonic Nitrifiers in an Oligotrophic Lake
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11. Nitrate Accumulation in Aerobic Hypolimnia: Relative Importance of Benthic and Planktonic Nitrifiers in an Oligotrophic Lake
Both nitrate and nitrous oxide accumulate in the hypolimnion of the oligotrophic Lake Taupo, New Zealand, throughout stratification. The two forms of oxidized nitrogen increase in concentration with increasing depth toward the sediments, where the dissolved concentrations of reduced nitrogen are two orders of magnitude higher than concentrations in the overl
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12. Ecophysiological Interaction between Nitrifying Bacteria and Heterotrophic Bacteria in Autotrophic Nitrifying Biofilms as Determined by Microautoradiography-Fluorescence In Situ Hybridization
Ecophysiological interactions between the community members (i.e., nitrifiers and heterotrophic bacteria) in a carbon-limited autotrophic nitrifying biofilm fed only NH4+ as an energy source were investigated by using a full-cycle 16S rRNA approach followed by microautoradiography (MAR)-fluorescence in situ hybridization (FISH). Phylogenetic differentiation
American Society for Microbiology.