Bacterioplankton Diversity
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. Diversidade e metabolismo do bacterioplâncton em lagos rasos subtropicais
A planície costeira do Rio Grande do Sul apresenta vários lagos subtropicais rasos com origem semelhante e uma grande amplitude de tamanho, distância e conectividade entre lagos, e desta maneira é aqui considerada como apropriada ao endereçamento de questões tais como diversidade e metabolismo do bacterioplâncton, um tópico atual de pesquisa. Em uma
Publicado em: 2008
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2. Especificidade em associações alga/bactéria vinculadas aos carbidratos excretados por três espécies fitoplanctônicas de um reservatório tropical eutrófico do Estado de São Paulo (Barra Bonita).
The release of carbohydrates by phytoplankton has been extensively studied because of its ecological significance. Bacterioplankton is a group of organisms that is able to use extracellular phytoplanktonic carbohydrates, as many authors have demonstrated. The aim of this thesis was to identify specific associations algae/bacteria in the planktonic environmen
Publicado em: 2003
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3. Richness and Diversity of Bacterioplankton Species along an Estuarine Gradient in Moreton Bay, Australia
Bacterioplankton community diversity was investigated in the subtropical Brisbane River-Moreton Bay estuary, Australia (27°25′S, 153°5′E). Bacterial communities were studied using automated rRNA intergenic spacer analysis (ARISA), which amplifies 16S-23S ribosomal DNA internally transcribed spacer regions from mixed-community DNA and detects the separa
American Society for Microbiology.
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4. Bacterial diversity among small-subunit rRNA gene clones and cellular isolates from the same seawater sample.
Numerous investigations applying the cloning and sequencing of rRNA genes (rDNAs) to the study of marine bacterioplankton diversity have shown that the sequences of genes cloned directly from environmental DNA do not correspond to the genes of cultured marine taxa. These results have been interpreted as support for the hypothesis that the most abundant heter
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5. Seasonal Dynamics of Bacterioplankton Community Structure in a Eutrophic Lake as Determined by 5S rRNA Analysis
Community structure of bacterioplankton was studied during the major growth season for phytoplankton (April to October) in the epilimnion of a temperate eutrophic lake (Lake Plußsee, northern Germany) by using comparative 5S rRNA analysis. Estimates of the relative abundances of single taxonomic groups were made on the basis of the amounts of single 5S rRNA
American Society for Microbiology.
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6. Changes in Bacterioplankton Community Structure and Activity with Depth in a Eutrophic Lake as Revealed by 5S rRNA Analysis
The community structure of bacterioplankton was studied at different depths (0 to 25 m) of a temperate eutrophic lake (Lake Plußsee in northern Germany) by using comparative 5S rRNA analysis. The relative amounts of taxonomic groups were estimated from 5S rRNA bands separated by high-resolution electrophoresis. Comparison of partial 5S rRNA sequences enable
American Society for Microbiology.
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7. Distribution of bacterioplankton in meromictic Lake Saelenvannet, as determined by denaturing gradient gel electrophoresis of PCR-amplified gene fragments coding for 16S rRNA.
The community structure of bacterioplankton in meromictic Lake Saelenvannet was examined by PCR amplification of the V3 region of 16S rRNA from microbial communities recovered from various depths in the water column. Two different primer sets were used, one for amplification of DNA from the domain Bacteria and another specific for DNA from the domain Archaea
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8. Dominant marine bacterioplankton species found among colony-forming bacteria.
The density of specific aquatic bacteria was determined by use of whole-genome DNA hybridization towards community DNA. From a coastal marine environment (northern Baltic Sea), 48 specific bacteria were isolated on solid media over a 1-year period. Based on the presented hybridization protocol, the total density of the isolates ranged between 7 and 69% of th
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9. Culturability and In Situ Abundance of Pelagic Bacteria from the North Sea
The culturability of abundant members of the domain Bacteria in North Sea bacterioplankton was investigated by a combination of various cultivation strategies and cultivation-independent 16S rRNA-based techniques. We retrieved 16S rRNA gene (rDNA) clones from environmental DNAs and determined the in situ abundance of different groups and genera by fluorescen
American Society for Microbiology.
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10. Bacterioplankton community structure and dynamics after large-scale release of nonindigenous bacteria as revealed by low-molecular-weight-RNA analysis.
A set of freshwater mesocosms (1.7 m3 each) was inoculated with large amounts of Escherichia coli, Pseudomonas putida, and their culture medium to substantially disturb the natural microbial community. To monitor microbial community dynamics, low-molecular-weight RNA (5S rRNA and tRNA) obtained directly from bacterioplankton was analyzed by using high-resolu
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11. High-Throughput Methods for Culturing Microorganisms in Very-Low-Nutrient Media Yield Diverse New Marine Isolates
Microbial diversity studies based on the cloning and sequencing of DNA from nature support the conclusion that only a fraction of the microbial diversity is currently represented in culture collections. Out of over 40 known prokaryotic phyla, only half have cultured representatives. In an effort to culture the uncultured phylotypes from oligotrophic marine e
American Society for Microbiology.
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12. Kinetic Bias in Estimates of Coastal Picoplankton Community Structure Obtained by Measurements of Small-Subunit rRNA Gene PCR Amplicon Length Heterogeneity
Marine bacterioplankton diversity was examined by quantifying natural length variation in the 5′ domain of small-subunit (SSU) rRNA genes (rDNA) amplified by PCR from a DNA sample from the Oregon coast. This new technique, length heterogeneity analysis by PCR (LH-PCR), determines the relative proportions of amplicons originating from different organisms by
American Society for Microbiology.