Plfas
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. 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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2. Diversidade microbiana em solos sob florestas de Araucaria angustifolia / Microbial diversity in soils under Araucaria angustifolia forests
The Ombrophilic Mixed Forest, also called Araucaria Forest, represents one of the richest remainders of subtropical pluvial forests in Brazil. Its main representative species is the endangered Araucaria angustifolia. The microbial diversity plays an important role in functioning of forest ecosystems. However, the microbial diversity in soils with araucaria f
Publicado em: 2008
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3. Phospholipid Fatty Acid Composition of the Syntrophic Anaerobic Bacterium Syntrophomonas wolfei†
The membrane phospholipid fatty acids (PLFAs) from several cocultures and a pure culture of Syntrophomonas wolfei were determined by capillary column gas chromatography. Cocultures of S. wolfei with a Desulfovibrio sp. contained PLFAs from both organisms, whereas PLFAs from a coculture with Methanospirillum hungatei contained very little biomass to analyze.
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4. Linking Toluene Degradation with Specific Microbial Populations in Soil
Phospholipid fatty acid (PLFA) analysis of a soil microbial community was coupled with 13C isotope tracer analysis to measure the community’s response to addition of 35 μg of [13C]toluene ml of soil solution−1. After 119 h of incubation with toluene, 96% of the incorporated 13C was detected in only 16 of the total 59 PLFAs (27%) extracted from the soil.
American Society for Microbiology.
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5. 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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6. The Microbial Community Structure of Drinking Water Biofilms Can Be Affected by Phosphorus Availability
Microbial communities in biofilms grown for 4 and 11 weeks under the flow of drinking water supplemented with 0, 1, 2, and 5 μg of phosphorus liter−1 and in drinking and warm waters were compared by using phospholipid fatty acids (PLFAs) and lipopolysaccharide 3-hydroxy fatty acids (LPS 3-OH-FAs). Phosphate increased the proportion of PLFAs 16:1ω7c and 1
American Society for Microbiology.
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7. Phospholipid Fatty Acid Composition, Biomass, and Activity of Microbial Communities from Two Soil Types Experimentally Exposed to Different Heavy Metals
The phospholipid fatty acid (PLFA) pattern was analyzed in a forest humus and in an arable soil experimentally polluted with Cd, Cu, Ni, Pb, or Zn at different concentrations. In both soil types, there were gradual changes in the PLFA patterns for the different levels of metal contamination. The changes in the forest soil were similar irrespective of which m
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8. Use of Phospholipid Fatty Acids To Detect Previous Self-Heating Events in Stored Peat
The use of the phospholipid fatty acid (PLFA) composition of microorganisms to detect previous self-heating events was studied in naturally self-heated peat and in peat incubated under temperature-controlled conditions. An increased content of total PLFAs was found in self-heated peat compared to that in unheated peat. Two PLFAs, denoted T1 and T2, were dete
American Society for Microbiology.
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9. Diversity and Activity of Methanotrophic Bacteria in Different Upland Soils
Samples from diverse upland soils that oxidize atmospheric methane were characterized with regard to methane oxidation activity and the community composition of methanotrophic bacteria (MB). MB were identified on the basis of the detection and comparative sequence analysis of the pmoA gene, which encodes a subunit of particulate methane monooxygenase. MB com
American Society for Microbiology.
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10. Application of Neural Computing Methods for Interpreting Phospholipid Fatty Acid Profiles of Natural Microbial Communities†
The microbial community compositions of surface and subsurface marine sediments and sediments lining burrows of marine polychaetes and hemichordates from the North Inlet estuary (near Georgetown, S.C.) were analyzed by comparing ester-linked phospholipid fatty acid (PLFA) profiles with a back-propagating neural network (NN). The NNs were trained to relate PL
American Society for Microbiology.
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11. Dynamics of a Pasture Soil Microbial Community after Deposition of Cattle Urine Amended with [13C]Urea
Within grazed pastures, urine patches are hot spots of nitrogen turnover, since dietary N surpluses are excreted mainly as urea in the urine. This short-term experiment investigated 13C uptake in microbial lipids after simulated deposition of cattle urine at 10.0 and 17.1 g of urea C m−2. Confined field plots without or with cattle urine amendment were sam
American Society for Microbiology.
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12. Microbial Community Dynamics Associated with Rhizosphere Carbon Flow
Root-deposited photosynthate (rhizodeposition) is an important source of readily available carbon (C) for microbes in the vicinity of growing roots. Plant nutrient availability is controlled, to a large extent, by the cycling of this and other organic materials through the soil microbial community. Currently, our understanding of microbial community dynamics
American Society for Microbiology.