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Showing 1 to 20 of 32 for “"bacterial abundance"”.
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Analysis of Bacterial Abundance and Species Diversity in Various Soils
… a wide range of nutrient content, microbial abundance and diversity. Many of the microbes viable in soil have practical functions in the agricultural and medical fields while others are pathogenic. Garden topsoil, potting soil, forest soil, compost and manure were the five soil types …
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Factors controlling bacterial abundance, biomass and growth at the Bermuda Atlantic time-series site
… environment to study the factors controlling bacterial growth dynamics. The region was sampled at monthly intervals from 1991 to 1996. A typical annual cycle was defined by a deep winter mixing, followed by an increasing stratification of the mixed layer through summer and fall. There were …
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Hypolimnetic oxygen decline and the hypolimnetic bacterial community.
This study reports on bacterial cell size and abundance change during oxygen depletion of Belton and Stillhouse Hollow reservoir. Bacterial cell size and abundance are compared with amount of heterotrophic nanoflagellates, dissolved oxygen, temperature, and time. The Relative Areal Hypolimnetic …
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A multi-disciplinary approach to the characterization of waterlogged burial environments : assessing the potential for the in situ preservation of organic archaeological remains
… parameters were measured down the soil profile. Bacterial abundance was determined by direct counts; activity was assayed by extracellular enzyme activity and leucine assimilation. The physiological profile of the microbial community was analysed using BIOLOG and the bacterial community structure …
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Assessing Respiration Rates and Nutrient Dynamics of Aritifical Reef Biofilms and Bacterioplankton in the Mississippi Sound
… biofilm on rubble and in its absence to examine bacterial growth, community respiration, and nutrient dynamics at four artificial reef habitats in the Mississippi Sound. Biofilm samples were also collected from settlement plates deployed at each site and were analyzed for 813C and 81sN stable …
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The Potential for Eutrophication Mitigation from Aquaculture of the Native Oyster, Crassostrea virginica, in Chesapeake Bay: Quantitative Assessment of an Ecosystem Service
… mitigation. Molecular approaches and direct abundance measures have improved our understanding of the sediment microbial community response to oyster biodeposition. Overall, sediments impacted by oyster biodeposition had a significantly different denitrifying community composition than …
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Upset Events At Wastewater Treatment Plants: Implications for Mitigative Strategy Development and Bioreactor Microbial Ecology
… in post-stress heterotrophic and autotrophic bacterial respiration rates for the bioreactors subjected to cadmium stress. The higher respiration rates were due to an increase in bacterial abundance in the cadmium stressed reactors. We were also able to show that the increase in bacterial …
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Evaluating the Role of the Ocular Surface Microbiome in Dry Eye Disease Mediated Neural Dysregulation
… exhibiting a loss of diversity and increase in bacterial abundance. Along with evidence of roles for microbiota in regulating pain and neural activity, this has led to an emerging role for the OSM in the pathogenesis of DED. We sought to investigate how shifts in the OSM may be associated with …
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The Utility of Culture Independent Methods to Evaluate the Fecal Microbiome in Overweight Horses Fed Orchard Grass Hay
… on equine fecal bacteria diversity and abundance, respectively. Fecal microbiomes were similar (80.5-87.9%) between geldings. The abundance of bacteria belonging to the Firmicutes phylum increased (p = 0.02) in the feces of geldings fed 12% NSC hay (mean 8.06 range [8.03-8.11] log10 …
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The effects of fish waste and oxytetracycline on the microbenthos
… persisting throughout the duration of the study. Bacterial abundance rapidly increased in the sediments when fish waste and oxytetracycline were added. While there was a potential for OTC to act on the microfaunal communities, this effect could not be conclusively demonstrated. A second study was …
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Factors influencing the abundance, community composition and activity states of bacterioplankton from the tidal freshwater James River
… a variety of mechanisms including changes in abundance, shifts in community composition and variable activity states. In the tidal-freshwater James River, variation in bacterial abundance was linked to nutrient availability and autochthonous production with highest bacterial densities …
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Tidal Influences on Bacterial and Phytoplankton Abundances and the Resulting Effects on Patterns of Dissolved Oxygen in the Skidaway River Estuary
… DO concentrations, Chlorophyll a concentrations, bacterial abundance, water depth, and salinity, every hour, for 26 hours, over both a neap and a spring tide. A spatial study looked at changes in the above variables at 5 sites along the SRE while following the tide inland during a neap high and …
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Environmental and biological drivers of bacterial and antimicrobial resistance carriage by house flies (Musca domestica L.)
… assess biological and environmental drivers of bacterial abundance, as well as trends of AMR for suspected coliform (SC) bacteria carried by adult house flies in both dairy and beef cattle production facilities in Kansas. Cultured aerobic bacteria and SC were enumerated from field collected male …
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NECROBIOME SUCCESSION IN COLD CONDITIONS
… study include whether the biodiversity or the abundance of certain bacteria rises or falls with increasing and decreasing temperatures, and whether or not a bacterial succession pattern could be established. DNA was isolated from the samples derived from muscles in two separate regions of the …
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Ecology and physiology of bacterial activity in a temperate saltmarsh lagoon, with an emphasis on nitrogen fixation
Heterotrophic bacterial activity and nitrogen fixation are fundamental to nutrient regeneration and nitrogen cycling in saltmarsh ecosystems. Ecological and physiological aspects of bacterial production and nitrogenase activity in marine sediments and water were examined in Langebaan Lagoon, a …
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Carbon and Nitrogen Dynamics in High Intensity Minimal Exchange Shrimp (<i>Litopenaeus vannamei</i>) Raceways
… (POC), particulate organic nitrogen (PON) and bacterial abundance (BA). The first growout had a complete die-off. The carbon and nitrogen budgets for the second and third growouts showed overall that the major input was feed and the major output was shrimp at harvest. The plastic media did not …
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Advancing Polycyclic Aromatic Hydrocarbon Bioremediation using Genetic Bioaugmentation in Soil Microbial Communities
… PAH removal by engaging a diverse, well-adapted bacterial community rather than relying on a single species. Previous research on genetic bioaugmentation has inadequately addressed the fitness impacts of plasmids on recipient bacteria, the range of plasmid recipients, and their effect on …
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Ecology and biogeochemistry of fluvial microphytobenthic communities on soft sediments
… types - clay, greensand and chalk - algal abundance and composition, algal extracellular organic carbon, bacterial abundance and physical characteristics including organic carbon and nutrient concentrations were examined. Results from this study showed that the contrasting habitats indeed …
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Corals at the extreme: partitioning the response of coral holobionts to marginal habitats
… which accounted for 47% of the coral’s bacterial community, was also uncovered, though its role in the holobiont remains unknown. Reciprocal translocations of corals between reef and mangrove habitats resulted in rapid reorganisation of coral-associated bacterial communities. Within four …
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Modeling for microbial communities with cross-feeding and predator-prey interactions
… metabolite levels according to the relative abundance of microbial species. Later, a machine learning algorithm compatible with the trophic model is used to computationally predict new cross-feeding interactions that are not yet tested by experiments. Besides, on the microscopic level of …
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