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5 results for “extracellular polymeric substances”
Extracellular polymeric substances are closely related to land cover, microbial communities, and enzyme activity in tropical soils
<p>These are datasets and R codes linked to the paper: Extracellular polymeric substances are closely related to land cover, microbial communities, and enzyme activity in tropical soils. </p>
Quantifying biostabilisation effects of biofilm-secreted and extracted extracellular polymeric substances (EPS) on sandy substrate
<p>This dataset provides the data underlying the manuscript <em>Quantifying biostabilisation effects of biofilm-secreted and extracted extracellular polymeric substances (EPS) on sandy substrate </em>published in Earth Surface Dynamics - an interactive open-access journal of the European Geosciences Union.</p> <p>The work was conducted in the Total Environment Simulator at the University of Hull as part of Task 9.3 of the Hydralab+ inititiative. </p> <p>Microbial assemblages ('biofilms') preferentially develop at water-sediment interfaces and are known to have a considerable influence on sediment stability and erodibility. There is potential for significant impacts on sediment transport and morphodynamics and, hence, on the longer-term evolution of coastal and fluvial environments. However, the biostabilisation effects remain poorly understood and quantified due to the inherent complexity of biofilms and the large spatial and temporal (i.e. seasonality) variations involved. Here, we use controlled laboratory tests to systematically quantify the effects of natural biofilm colonisation as well as extracted extracellular polymeric substances (EPS) on sediment stability. Extracted EPS may be useful to simulate biofilm-mediated biostabilisation, and potentially provides a method of speeding up time scales of physical modelling experiments investigating biostabilisation effects. We find a mean biostabilisation effect due to natural biofilm colonisation and development of almost four times that of the uncolonised sand. The presented cumulative probability distribution of measured critical threshold for erosion of colonised sand reflects the large spatial and temporal variations generally seen in natural biostabilised environments. For identical sand, engineered sediment stability from the addition of extracted EPS compares well across the measured range of the critical threshold for erosion and behaves in a linear and predictable fashion. Yet, the effectiveness of extracted EPS to stabilise sediment is sensitive to the preparation procedure, time after application and environmental conditions such as salinity, pH and temperature. These findings are expected to improve bio-physical experimental models in fluvial and coastal environments and provide much-needed quantification of biostabilisation to improve predictions of sediment dynamics in aquatic ecosystems.</p>
Multiple extracellular polymeric substances pathways expressed by Accumulibacter and the flanking community during aerobic granule formation and after influent modification
<p><span>Aerobic granular sludge is a biological wastewater treatment process in which a microbial community forms a granular biofilm. The role of <em>Candidatus</em> Accumulibacter in the production of a biofilm matrix, composed of extracellular polymeric substances, was studied in a sequencing batch reactor enriched with polyphosphate-accumulating organisms. The metabolisms of the microbial populations were investigated using <em>de novo</em> metatranscriptomics analysis. Finally, the effect of decreasing the influent phosphate concentration on the granule stability and microbial activity was investigated. </span></p> <p><span>A few weeks after the reactor start-up, the microbial community was dominated by <em>Accumulibacter</em> with up to nine species active in parallel. However, the most active species differed according to sampling time. Decreasing drastically the influent phosphate concentration led to a dominance of the glycogen-accumulating organism <em>Propionivibrio</em>, with some <em>Accumulibacter</em> species still abundant. <em>De novo</em> metatranscriptomics analysis indicated a high diversity of potential extracellular substances produced mainly by <em>Accumulibacter</em>, <em>Azonexus</em>, <em>Candidatus</em> Contendobacter, and <em>Propionivibrio</em>. Moreover, the results suggest that <em>Azonexus</em>, <em>Contendobacter</em> and <em>Propionivibrio</em> recycle the neuraminic acids produced by <em>Accumulibacter</em>. Changes in the microbial community did not cause the granules to disintegrate, indicating that a <em>Propionivibrio</em>-dominated community can maintain stable granules.</span></p>
Janus nanoparticles targeting extracellular polymeric substance achieve flexible elimination of drug-resistant biofilms
GEO Series GSE239411. Staphylococcus aureus. 4 samples. Type: Expression profiling by high throughput sequencing.
Absence of KpsM (Slr0977) impairs the secretion of extracellular polymeric substances (EPS) and impacts carbon fluxes in Synechocystis sp. PCC 6803
GEO Series GSE165073. Synechocystis sp. PCC 6803. 6 samples. Type: Expression profiling by high throughput sequencing.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.