Plfa
Mostrando 1-12 de 32 artigos, teses e dissertações.
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1. Comunidades microbianas de solos de Cerrado sob vegetação nativa sujeita a queimadas prescritas e sob pastagem
O objetivo deste trabalho foi avaliar os efeitos de regimes de queima e cobertura vegetal sobre a dinâmica e a estrutura de comunidades microbianas do solo, por meio da análise de perfis de ácidos graxos de fosfolipídeos (PLFA). Compararam-se áreas nativas com diferentes coberturas vegetais (cerrado stricto sensu e campo sujo), sob diferentes regimes de
Pesquisa Agropecuária Brasileira. Publicado em: 2011-12
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2. Indicadores microbiológicos de qualidade do solo em Florestas de Araucária no Estado de São Paulo / Microbilogical indicators of soil quality in Araucaria Forest in São Paulo State
A Araucaria angustifolia, conhecida como Pinheiro-do-Paraná é uma espécie ameaçada de extinção no Brasil, está inserida num bioma rico em biodiversidade, a Mata Atlântica, e muito pouco se conhece sobre os atributos microbiológicos dessas florestas. Este trabalho teve como objetivo avaliar potenciais atributos microbiológicos do solo e algumas vari
Publicado em: 2011
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3. Atributos microbiológicos do solo em área agrícola sob disposição de lodo de curtume / Soil microbiological attributes of an agricultural area following disposal of tannery sludge
Os lodos de curtume apresentam elevados teores de nutrientes e potencial de neutralização da acidez do solo, possibilitando sua utilização em áreas agrícolas, como uma alternativa para disposição e reciclagem desses resíduos. Por outro lado, o acúmulo no solo de altas concentrações de alguns elementos, como nitrogênio, sódio e cromo, provenient
Publicado em: 2010
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4. Characterization of Microbial Community Structure in the Surface Sediment of Osaka Bay, Japan, by Phospholipid Fatty Acid Analysis
Twenty-eight sediment samples collected from Osaka Bay, Japan, were analyzed for phospholipid ester-linked fatty acids (PLFA) to determine regional differences in microbial community structure of the bay. The abundance of three major groups of C10 to C19 PLFA (saturated, branched, and monounsaturated PLFA), which accounted for 84 to 97% of the total PLFA, in
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5. Dynamics of a microbial community associated with manure hot spots as revealed by phospholipid fatty acid analyses.
Microbial community dynamics associated with manure hot spots were studied by using a model system consisting of a gel-stabilized mixture of soil and manure, placed between layers of soil, during a 3-week incubation period. The microbial biomass, measured as the total amount of phospholipid fatty acids (PLFA), had doubled within a 2-mm distance from the soil
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6. Radioactive Fingerprinting of Microorganisms That Oxidize Atmospheric Methane in Different Soils
Microorganisms that oxidize atmospheric methane in soils were characterized by radioactive labelling with 14CH4 followed by analysis of radiolabelled phospholipid ester-linked fatty acids (14C-PLFAs). The radioactive fingerprinting technique was used to compare active methanotrophs in soil samples from Greenland, Denmark, the United States, and Brazil. The 1
American Society for Microbiology.
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7. Characterization of Multiple-Substrate Utilization by Anthracene-Degrading Mycobacterium frederiksbergense LB501T
Stable carbon isotope analysis of biomass and analyses of phospholipid fatty acids (PLFA), glycolipid fatty acids (GLFA), and mycolic acids were used to characterize mixed-substrate utilization by Mycobacterium frederiksbergense LB501T under various substrate regimens. The distinct 13C contents of anthracene and glucose as representatives of typical hydropho
American Society for Microbiology.
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8. Variation in Microbial Biomass and Community Structure in Sediments of Eutrophic Bays as Determined by Phospholipid Ester-Linked Fatty Acids
The distribution of phospholipid ester-linked fatty acids (PLFA) in sediments of eutrophic bays (Hiroshima Bay and Aki Nada) was studied to quantify the microbial biomass, community structure, and nutritional status. A total of 63 fatty acids in the range of C10 to C24 were determined. They consist of saturated fatty acids, branched fatty acids, monounsatura
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9. Changes in Ester-Linked Phospholipid Fatty Acid Profiles of Subsurface Bacteria during Starvation and Desiccation in a Porous Medium
Ester-linked phospholipid fatty acid (PLFA) profiles of a Pseudomonas aureofaciens strain and an Arthrobacter protophormiae strain, each isolated from a subsurface sediment, were quantified in a starvation experiment in a silica sand porous medium under moist and dry conditions. Washed cells were added to sand microcosms and maintained under saturated condit
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10. Effect of Metal-Rich Sludge Amendments on the Soil Microbial Community
The effects of heavy-metal-containing sewage sludge on the soil microbial community were studied in two agricultural soils of different textures, which had been contaminated separately with three predominantly single metals (Cu, Zn, and Ni) at two different levels more than 20 years ago. We compared three community-based microbiological measurements, namely,
American Society for Microbiology.
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11. Effects of Sieving, Storage, and Incubation Temperature on the Phospholipid Fatty Acid Profile of a Soil Microbial Community †
Disturbances typically associated with the study of soil microbial communities, i.e., sieving, storage, and subsequent incubation at elevated temperatures, were investigated with phospholipid fatty acid (PLFA) analyses. Treatment effects were quantified by statistical analyses of the mole percentage distribution of the individual fatty acids. Changes in the
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12. Structure of a Microbial Community in Soil after Prolonged Addition of Low Levels of Simulated Acid Rain
Humus samples were collected 12 growing seasons after the start of a simulated acid rain experiment situated in the subarctic environment. The acid rain was simulated with H2SO4, a combination of H2SO4 and HNO3, and HNO3 at two levels of moderate acidic loads close to the natural anthropogenic pollution levels of southern Scandinavia. The higher levels of ac
American Society for Microbiology.