Over a wide range of experimental conditions and dechlorination steps, SRS appears to induce relatively little hydrogen limitation, thereby facilitating relatively quick conversion of TCE to ethene. Competitive inhibition is found to increase in significance as TCE concentrations increase however, inclusion of Haldane inhibition is not supported. Results quantify the benefit (i.e., increased stepwise dechlorination rate) due to both bioaugmentation and the presence of higher sulphate concentrations. In calibrating the model to over 60 of the microcosm experiments, lumped parameters were employed to quantify the effect of key factors on the conversion rate of each chlorinated ethene in the TCE degradation sequence. This research presents a numerical model designed to simulate the main processes occurring in the microcosms, including substrate fermentation, sequential dechlorination, toxic inhibition, and the influence of sulphate concentration. individuals were significantly negatively associated with the concentration of total petroleum hydrocarbons (Spearman correlation coefficients, p 500 mg/L) on TCE dechlorination. The total meiofaunal density, nematode density, and number of Bolbolaimus spp. Cluster analysis showed similar results for nematode and meiofaunal communities. (37.1%) were dominant among the nematodes. However, SIMPROF analysis showed no significant difference between the two groups ( p > 0.05). Cluster analysis divided the microcosms into group 1 (control, 0.5%, 1%, 2%, and 4% microcosms) and group 2 (8%, 15%, and 20% microcosms). The density of nematodes was similar to that of the total meiofauna. The average density of total meiofauna in the 8%, 15%, and 20% microcosms was lower than the density in the control. The average density of total meiofauna in the experimental microcosms diluted with 0.5%, 1%, 2%, and 4% contaminated seawater was higher than the density in the control. We administered a seawater solution that had been contaminated with total petroleum hydrocarbons to seven treatment groups at different concentrations, while the control group received uncontaminated filtered seawater. We examined the effects of crude oil contamination on community assemblages of meiofauna and nematodes after exposure to total petroleum hydrocarbons in the laboratory. Kang, Teawook Oh, Je Hyeok Hong, Jae-Sang Kim, Dongsung Responses of meiofauna and nematode communities to crude oil contamination in a laboratory microcosm experiment The microcosm lab provides student-centered approach with opportunities for collaborative learning and to develop critical communication skills. The traditional range of marine microcosm laboratory experiments is presented as an ideal environment to teach the entire analysis process. These results suggest that the repeated introduction of pollutants could accelerate microbial succession in microcosms, resulting in the rapid re-equilibration of microbial communities.Ĭonditionally rare taxa environmental pollution microbial succession microcosm temporal dynamics.Extending the Marine Microcosm LaboratoryĮRIC Educational Resources Information Center In addition, conditionally rare taxa that were specific to the treatments exhibited higher betweenness centrality values in the co-occurrence network, indicating a strong influence on other interactions in the community. The rate of appearance for new taxa and the temporal turnover within microbial communities were higher than the rates reported in other studies of microbial communities in air, water and soil samples. Specifically, the repression and induction of microbial taxa were dominant, and the fluctuation was not significant. The dynamics of microbial communities in response to different pollutants alone and in combination displayed similar patterns during enrichment. Subculturing was performed at 10-day intervals, followed by high-throughput sequencing of 16S rRNA genes. To investigate the temporal dynamics of microbial communities in response to pollutants, we analysed the microbial community structure in batch microcosms that were inoculated with soil bacteria following exposure to individual or combined pollutants (phenanthrene, n-octadecane, phenanthrene + n-octadecane and phenanthrene + n-octadecane + CdCl 2 ). Given the increasing human pressure on the environment and natural resources, responses to the repeated introduction of organic and inorganic pollutants are of particular interest. Elucidating the mechanisms underlying microbial succession is a major goal of microbial ecology research.
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