The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Kengo Kubota - One of the best experts on this subject based on the ideXlab platform.
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response of morphology and microbial community structure of granules to influent cod so42 ratios in an upflow anaerobic sludge blanket uasb reactor treating starch wastewater
Bioresource Technology, 2018Co-Authors: Guangyin Zhen, Kengo KubotaAbstract:Abstract Biochemical properties of granules are of vital importance to UASB performance. This study characterized the granules cultivated at different COD/SO42− ratios to elucidate the influence of sulfidogenesis on starch wastewater (1000 mg-COD L−1) biodegradation kinetics and process stability. Suitable sulfate addition enriched granular Microecosystems and stimulated the secretion of extracellular substances, facilitating cells cohersion and sludge aggregation. The percentage of granules larger than 2.8 mm increased from
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response of morphology and microbial community structure of granules to influent cod so42 ratios in an upflow anaerobic sludge blanket uasb reactor treating starch wastewater
Bioresource Technology, 2018Co-Authors: Guangyin Zhen, Kengo KubotaAbstract:Biochemical properties of granules are of vital importance to UASB performance. This study characterized the granules cultivated at different COD/SO42- ratios to elucidate the influence of sulfidogenesis on starch wastewater (1000 mg-COD L-1) biodegradation kinetics and process stability. Suitable sulfate addition enriched granular Microecosystems and stimulated the secretion of extracellular substances, facilitating cells cohersion and sludge aggregation. The percentage of granules larger than 2.8 mm increased from <10.0% to 58.8-69.4% with decreasing COD/SO42- ratio from 10 to 2. Starch-fed granules tended to grow flagella-like filaments on the surface. The filaments overwhelmed by hydrophilic biopolymers had high affinity for biogas-bubbles and water-molecules aggravating granule floatation and washout. 16 s rRNA gene analysis revealed that decreasing COD/SO42- ratio shifted Syntrophobacterales to Desulfovibrio, which co-worked with Methanosaeta while suppressing Methanobacterium thereby altering starch bioconversion routes. Decrease in Syntrophobacterales caused propionate accumulation and slight process upset.
Guangyin Zhen - One of the best experts on this subject based on the ideXlab platform.
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response of morphology and microbial community structure of granules to influent cod so42 ratios in an upflow anaerobic sludge blanket uasb reactor treating starch wastewater
Bioresource Technology, 2018Co-Authors: Guangyin Zhen, Kengo KubotaAbstract:Abstract Biochemical properties of granules are of vital importance to UASB performance. This study characterized the granules cultivated at different COD/SO42− ratios to elucidate the influence of sulfidogenesis on starch wastewater (1000 mg-COD L−1) biodegradation kinetics and process stability. Suitable sulfate addition enriched granular Microecosystems and stimulated the secretion of extracellular substances, facilitating cells cohersion and sludge aggregation. The percentage of granules larger than 2.8 mm increased from
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response of morphology and microbial community structure of granules to influent cod so42 ratios in an upflow anaerobic sludge blanket uasb reactor treating starch wastewater
Bioresource Technology, 2018Co-Authors: Guangyin Zhen, Kengo KubotaAbstract:Biochemical properties of granules are of vital importance to UASB performance. This study characterized the granules cultivated at different COD/SO42- ratios to elucidate the influence of sulfidogenesis on starch wastewater (1000 mg-COD L-1) biodegradation kinetics and process stability. Suitable sulfate addition enriched granular Microecosystems and stimulated the secretion of extracellular substances, facilitating cells cohersion and sludge aggregation. The percentage of granules larger than 2.8 mm increased from <10.0% to 58.8-69.4% with decreasing COD/SO42- ratio from 10 to 2. Starch-fed granules tended to grow flagella-like filaments on the surface. The filaments overwhelmed by hydrophilic biopolymers had high affinity for biogas-bubbles and water-molecules aggravating granule floatation and washout. 16 s rRNA gene analysis revealed that decreasing COD/SO42- ratio shifted Syntrophobacterales to Desulfovibrio, which co-worked with Methanosaeta while suppressing Methanobacterium thereby altering starch bioconversion routes. Decrease in Syntrophobacterales caused propionate accumulation and slight process upset.
Aaron M. Ellison - One of the best experts on this subject based on the ideXlab platform.
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regime shifts and hysteresis in the pitcher plant Microecosystem
Ecological Modelling, 2018Co-Authors: Matthew K Lau, Nicholas J. Gotelli, Benjamin Baiser, Amanda C Northrop, Aaron M. EllisonAbstract:Abstract Changes in environmental conditions can lead to rapid shifts in the state of an ecosystem (“regime shifts”), which, even after the environment has returned to previous conditions, subsequently recovers slowly to the previous state (“hysteresis”). Large spatial and temporal scales of dynamics, and the lack of frameworks linking observations to models, are challenges to understanding and predicting ecosystem responses to perturbations. The naturally-occurring Microecosystem inside leaves of the northern pitcher plant (Sarracenia purpurea) exhibits oligotrophic and eutrophic states that can be induced by adding insect prey. Here, we further develop a model for simulating these dynamics, parameterize it using data from a prey addition experiment and conduct a sensitivity analysis to identify critical zones within the parameter space. Simulations illustrate that the Microecosystem model displays regime shifts and hysteresis. Parallel results were observed in the plant itself after experimental enrichment with prey. Decomposition rate of prey was the main driver of system dynamics, including the time the system remains in an anoxic state and the rate of return to an oxygenated state. Biological oxygen demand influenced the shape of the system's return trajectory. The combination of simulated results, sensitivity analysis and use of empirical results to parameterize the model more precisely demonstrates that the Sarracenia Microecosystem model displays behaviors qualitatively similar to models of larger ecological systems.
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regime shifts and hysteresis in the pitcher plant Microecosystem
bioRxiv, 2018Co-Authors: Matthew K Lau, Nicholas J. Gotelli, Benjamin Baiser, Amanda C Northrop, Aaron M. EllisonAbstract:Changes in environmental conditions can lead to rapid shifts in ecosystem state ("regime shifts"), which subsequently returns slowly to the previous state ("hysteresis"). Large spatial and temporal scales of dynamics, and the lack of frameworks linking observations to models, are challenges to understanding and predicting ecosystem responses to perturbations. The naturally-occurring Microecosystem inside leaves of the northern pitcher plant ( Sarracenia purpurea ) exhibits oligotrophic and eutrophic states that can be induced by adding insect "prey." Here, we further develop a model for simulating these dynamics, parameterize it using data from a prey addition experiment and conduct a sensitivity analysis to identify critical zones within the parameter space. Simulations illustrate that the Microecosystem model displays regime shifts and hysteresis. Parallel results were observed in the plant itself after experimental enrichment with prey. Decomposition rate of prey was the main driver of system dynamics, including the time the system remains in an anoxic state and the rate of return to an oxygenated state. Biological oxygen demand influenced the shape of the system9s return trajectory. The combination of simulated results, sensitivity analysis and use of empirical results to parameterize the model more precisely demonstrates that the Sarracenia Microecosystem model displays behaviors qualitatively similar to models of larger ecological systems.
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regime shifts and hysteresis in the sarracenia Microecosystem
bioRxiv, 2017Co-Authors: Matthew K Lau, Nicholas J. Gotelli, Benjamin Baiser, Amanda C Northrop, Aaron M. EllisonAbstract:Changes in environmental conditions can lead to rapid shifts in ecosystem state ("regime shifts"), which subsequently returns slowly to the previous state ("hysteresis"). Large spatial and temporal scales of dynamics, and the lack of frameworks linking observations to models, are challenges to understanding and predicting ecosystem responses to perturbations. The naturally-occurring Microecosystem inside leaves of the northern pitcher plant ( Sarracenia purpurea ) exhibits oligotrophic and eutrophic states that can be induced by adding insect "prey." Here, we further develop a model for simulating these dynamics, parameterize it using data from a prey addition experiment and conduct a sensitivity analysis to identify critical zones within the parameter space. Simulations illustrate that the Microecosystem model displays regime shifts and hysteresis. Parallel results were observed in the plant itself after experimental enrichment with prey. Decomposition rate of prey was the main driver of system dynamics, including the time the system remains in an anoxic state and the rate of return to an oxygenated state. Biological oxygen demand influenced the shape of the system9s return trajectory. The combination of simulated results, sensitivity analysis and use of empirical results to parameterize the model more precisely demonstrates that the Sarracenia Microecosystem model displays behaviors qualitatively similar to models of larger ecological systems.
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regime shifts alternative states and hysteresis in the sarracenia Microecosystem
bioRxiv, 2016Co-Authors: Matthew K Lau, Nicholas J. Gotelli, Benjamin Baiser, Aaron M. EllisonAbstract:Changes in environmental conditions can lead to a rapid shift in the state of an ecosystem ("regime shift"), which subsequently returns to the previous state slowly, if ever ("hysteresis"). Studies of ecological regime shifts have been hampered by the large spatial and temporal scales over which they occur and the lack of a common framework linking observational and experimental data to models. The naturally-occurring aquatic micro-ecosystem inside leaves of the northern pitcher plant ( Sarracenia purpurea ) occurs in both oligotrophic and eutrophic states. These alternative states also can be induced experimentally by enriching oligotrophic pitchers with additional insect prey, which elevates oxygen demand by microbes and leads to rapid eutrophication. This regime shift of the Sarracenia micro-ecosystem has been modeled with discrete-time difference equations that include parameters for the photosynthetic rate of the pitcher plant, consequent diffusion of oxygen through the pitcher liquid, rate of prey input, and biological oxygen demand by microbes as they decompose and mineralize the prey. We elaborated the regime-shift model of the Sarracenia micro-ecosystem and used sensitivity analysis to identify the parameters that control most strongly the dynamics of the system as it switches between oligotrophic and eutrophic states. Three main findings emerged. 1) Simulations accurately captured the regime shift and subsequent hysteresis that follows from prey enrichment; 2) When modeled as a modified Hill function, the interaction of prey input and decomposition rates drove the regime shift; 3) The interaction between biological oxygen demand of the food web and decomposition rate yielded a threshold that altered the hysteresis dynamics, shifting the sign of the effect of increasing the oxygen demand parameter. Because the model of the Sarracenia micro-ecosystem displays behaviors that are qualitatively similar to larger scale models of dynamic systems, we suggest that the Sarracenia micro-ecosystem itself represents a valuable and scalable experimental system for studying ecological regime shifts.
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a keystone predator controls bacterial diversity in the pitcher plant sarracenia purpurea Microecosystem
Environmental Microbiology, 2008Co-Authors: Celeste N Peterson, Benjamin E. Wolfe, Aaron M. Ellison, Roberto Kolter, Anne PringleAbstract:Summary The community of organisms inhabiting the waterfilled leaves of the carnivorous pitcher-plant Sarracenia purpurea includes arthropods, protozoa and bacteria, and serves as a model system for studies of food web dynamics. Despite the wealth of data collected by ecologists and zoologists on this food web, very little is known about the bacterial assemblage in this Microecosystem. We used terminal restriction fragment length polymorphism (T-RFLP) analysis to quantify bacterial diversity within the pitchers as a function of pitcher size, pH of the pitcher fluid and the presence of the keystone predator in this food web, larvae of the pitcher-plant mosquito Wyeomyia smithii. Results were analysed at two spatial scales: within a single bog and across three isolated bogs. Pitchers were sterile before they opened and composition of the bacterial assemblage was more variable between different bogs than within bogs. Measures of bacterial richness and diversity were greater in the presence of W. smithii and increased with increasing pitcher size. Our results suggest that fundamental ecological concepts derived from macroscopic food webs can also be used to predict the bacterial assemblages in pitcher plants.
Ederio Dino Bidoia - One of the best experts on this subject based on the ideXlab platform.
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Contamination by Remazol Red Brilliant Dye and Its Impact in Aquatic Photosynthetic Microbiota
2016Co-Authors: Mariana Lopes De Sousa, Peterson Bueno De Moraes, Renato Nallin Montagnolli, Paulo Renato, Matos Lopes, Ederio Dino BidoiaAbstract:The purpose of this work was to evaluate the heterogeneity and diversity of algae according to an aquatic environment polluted by Remazol Red Brilliant dye. Methodology followed Winogradsky columns technique, which describes a Microecosystem in a glass container. Two columns were prepared: one control and another with Remazol Red Brilliant dye simulating a contaminated environment. The experiment was under illumination to provide light energy to photosynthetic organisms and alteration in two columns were observed and quantified: algae development and color changes. Results demonstrated that pH remained constant in control column; however the initial pH changed in contaminated column. A higher pH observed at the bottom after 48 days showed microbial activity in dye biodegradation, which was corroborated by minor absorbance value at Remazol Red Brilliant peak (541.
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Impact of the Textile Dye Acid Blue 40 on the Periphyton of a Simulated Microecosystem
Water Air & Soil Pollution, 2014Co-Authors: Mariana Lopes De Sousa, Ederio Dino BidoiaAbstract:Textile industry is responsible for a large amount of wastewater inappropriate for both human consumption and aquatic species. Aquatic ecosystems are way more sensitive to the release of textile wastewater, and the usage of Winogradsky columns is interesting, once they are a simulated aquatic ecosystem in which the growth of algae and other microorganisms can be observed. In this research, simulated textile effluents with the dye Acid Blue 40 were treated with an electrolytic reactor, for a later ecotoxicological evaluation using Winogradsky columns. The algal and microbial population and primary production were measured. The results have shown that the electrolytic treatment was satisfactory when it comes to color removal, but the presence of the treated effluent in the Winogradsky columns changed the Microecosystem. The number of algae identified decreased when exposed to certain effluents, and some algae groups even disappeared, while others such as Cyanophyceae were benefited.
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Textile Dye Treated Photoelectrolytically and Monitored by Winogradsky Columns
Environmental Engineering Science, 2012Co-Authors: Mariana Lopes De Sousa, Peterson Bueno De Moraes, Dejanira De Franceschi De Angelis, Paulo Renato Matos Lopes, Renato Nallin Montagnolli, Ederio Dino BidoiaAbstract:Abstract Due to large amounts of wastewater generated by textile industry, studies on degradation and subsequent impact of these effluents are needed when they are released into water bodies. Since reactive dyes present higher degradation when treated by physical and chemical processes, a photoelectrolytic process was used. Ecotoxicological analysis of simulated textile effluents was conducted before and after treatment. Winogradsky columns were used, simulating a Microecosystem where algae growth was examined. Results indicated that the photoelectrolytic process achieved satisfactory results in color degradation of the studied dye (Remazol red brilliant), but after 30?min of treatment, even though the effluent became colorless, it reduced dramatically microalgae diversity. Although complete color removal (97%) was not observed, the effluent treated for 5?min did not affect microalgae growth in the same way as the effluent treated for 30?min. An optimum treatment time of 5 min was determined.
Mariana Lopes De Sousa - One of the best experts on this subject based on the ideXlab platform.
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Contamination by Remazol Red Brilliant Dye and Its Impact in Aquatic Photosynthetic Microbiota
2016Co-Authors: Mariana Lopes De Sousa, Peterson Bueno De Moraes, Renato Nallin Montagnolli, Paulo Renato, Matos Lopes, Ederio Dino BidoiaAbstract:The purpose of this work was to evaluate the heterogeneity and diversity of algae according to an aquatic environment polluted by Remazol Red Brilliant dye. Methodology followed Winogradsky columns technique, which describes a Microecosystem in a glass container. Two columns were prepared: one control and another with Remazol Red Brilliant dye simulating a contaminated environment. The experiment was under illumination to provide light energy to photosynthetic organisms and alteration in two columns were observed and quantified: algae development and color changes. Results demonstrated that pH remained constant in control column; however the initial pH changed in contaminated column. A higher pH observed at the bottom after 48 days showed microbial activity in dye biodegradation, which was corroborated by minor absorbance value at Remazol Red Brilliant peak (541.
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Impact of the Textile Dye Acid Blue 40 on the Periphyton of a Simulated Microecosystem
Springer, 2014Co-Authors: Mariana Lopes De Sousa, Bidoia, Ederio DinoAbstract:Textile industry is responsible for a large amount of wastewater inappropriate for both human consumption and aquatic species. Aquatic ecosystems are way more sensitive to the release of textile wastewater, and the usage of Winogradsky columns is interesting, once they are a simulated aquatic ecosystem in which the growth of algae and other microorganisms can be observed. In this research, simulated textile effluents with the dye Acid Blue 40 were treated with an electrolytic reactor, for a later ecotoxicological evaluation using Winogradsky columns. The algal and microbial population and primary production were measured. The results have shown that the electrolytic treatment was satisfactory when it comes to color removal, but the presence of the treated effluent in the Winogradsky columns changed the Microecosystem. The number of algae identified decreased when exposed to certain effluents, and some algae groups even disappeared, while others such as Cyanophyceae were benefited.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP
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Impact of the Textile Dye Acid Blue 40 on the Periphyton of a Simulated Microecosystem
Water Air & Soil Pollution, 2014Co-Authors: Mariana Lopes De Sousa, Ederio Dino BidoiaAbstract:Textile industry is responsible for a large amount of wastewater inappropriate for both human consumption and aquatic species. Aquatic ecosystems are way more sensitive to the release of textile wastewater, and the usage of Winogradsky columns is interesting, once they are a simulated aquatic ecosystem in which the growth of algae and other microorganisms can be observed. In this research, simulated textile effluents with the dye Acid Blue 40 were treated with an electrolytic reactor, for a later ecotoxicological evaluation using Winogradsky columns. The algal and microbial population and primary production were measured. The results have shown that the electrolytic treatment was satisfactory when it comes to color removal, but the presence of the treated effluent in the Winogradsky columns changed the Microecosystem. The number of algae identified decreased when exposed to certain effluents, and some algae groups even disappeared, while others such as Cyanophyceae were benefited.
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Textile Dye Treated Photoelectrolytically and Monitored by Winogradsky Columns
Environmental Engineering Science, 2012Co-Authors: Mariana Lopes De Sousa, Peterson Bueno De Moraes, Dejanira De Franceschi De Angelis, Paulo Renato Matos Lopes, Renato Nallin Montagnolli, Ederio Dino BidoiaAbstract:Abstract Due to large amounts of wastewater generated by textile industry, studies on degradation and subsequent impact of these effluents are needed when they are released into water bodies. Since reactive dyes present higher degradation when treated by physical and chemical processes, a photoelectrolytic process was used. Ecotoxicological analysis of simulated textile effluents was conducted before and after treatment. Winogradsky columns were used, simulating a Microecosystem where algae growth was examined. Results indicated that the photoelectrolytic process achieved satisfactory results in color degradation of the studied dye (Remazol red brilliant), but after 30?min of treatment, even though the effluent became colorless, it reduced dramatically microalgae diversity. Although complete color removal (97%) was not observed, the effluent treated for 5?min did not affect microalgae growth in the same way as the effluent treated for 30?min. An optimum treatment time of 5 min was determined.