Project description:The response of soil microbial community to climate warming through both function shift and composition reorganization may profoundly influence global nutrient cycles, leading to potential significant carbon release from the terrain to the atmosphere. Despite the observed carbon flux change in northern permafrost, it remains unclear how soil microbial community contributes to this ecosystem alteration. Here, we applied microarray-based GeoChip 4.0 to investigate the functional and compositional response of subsurface (15~25cm) soil microbial community under about one year’s artificial heating (+2°C) in the Carbon in Permafrost Experimental Heating Research site on Alaska’s moist acidic tundra. Statistical analyses of GeoChip signal intensities showed significant microbial function shift in AK samples. Detrended correspondence analysis and dissimilarity tests (MRPP and ANOSIM) indicated significant functional structure difference between the warmed and the control communities. ANOVA revealed that 60% of the 70 detected individual genes in carbon, nitrogen, phosphorous and sulfur cyclings were substantially increased (p<0.05) by heating. 18 out of 33 detected carbon degradation genes were more abundant in warming samples in AK site, regardless of the discrepancy of labile or recalcitrant C, indicating a high temperature sensitivity of carbon degradation genes in rich carbon pool environment. These results demonstrated a rapid response of northern permafrost soil microbial community to warming. Considering the large carbon storage in northern permafrost region, microbial activity in this region may cause dramatic positive feedback to climate change, which is important and necessary to be integrated into climate change models.
Project description:In this project we aimed at deciphering modulation in genes expression induced by external pulsed electric fields applied in reversible electroporation-based treatments. Thanks to their local application and transient effects, physical stimuli appear as attractive tools to remodel extracellular matrix, which was the point of interest in our to be published study. We assessed the potential of pulsed electric field technology, classically applied to drug delivery, to induce collagen remodeling at the tissue scale. A sophisticated in vitro tissue-engineered human dermal substitute, a tissue model rich in endogeneous extracellular matrix such as collagens, was used to demonstrate the effects of microsecond and millisecond pulsed electric fields applied respectively in electrochemotherapy (ECT) treatment and gene electrotransfer (GET) strategy. Our analyses, focused on matrisome genes and extracellular matrix remodeling, underpin that pulsed electric fields, a technology already approved for clinical use combined with anti-cancer agents, are particularly promising to provide local and effective treatment of abnormal extracellular matrix. Part of this dataset was used to describe how pulsed electric field on its own (with no addition of external drugs) induce extracellular matrix (ECM) remodeling at human dermal scale, by focusing at genes related to matrisome subset. In this manuscript to be published, electrochemotherapy (ECT) parameters were named SP for "short pulses" and gene electrotransfer (GET) parameters were named LP for "long pulses". W demonstrated that these both types of electric parameters inducing reversible electroporation of the cells whitin the dermal tissue substitute induced 1) a rapid modulation (4h after electrostimulation) of mRNA’s genes composing the matrisome, particularly a down-regulation of pro-collagens and ECM maturation’s enzymes such as transglutaminase TG2 and LOX-like; 2) a transient decrease in pro-collagens production and hydroxyproline tissue content within a week after electrostimulation; 3) a long-lasting ROS-dependent over-activation of MMPs for at least 48h and 4) a down-regulation at both mRNA and protein level of pro-fibrotic TGF-β.
Project description:The increased urban pressures are often associated with specialization of microbial communities. Microbial communities being a critical player in the geochemical processes, makes it important to identify key environmental parameters that influence the community structure and its function.In this proect we study the influence of land use type and environmental parameters on the structure and function of microbial communities. The present study was conducted in an urban catchment, where the metal and pollutants levels are under allowable limits. The overall goal of this study is to understand the role of engineered physicochemical environment on the structure and function of microbial communities in urban storm-water canals. Microbial community structure was determined using PhyoChio (G3)
2014-12-22 | GSE64368 | GEO
Project description:Metagenomic sequencing of activated sludge treating mariculture wastewater with/without electric field applied.
Project description:The increased urban pressures are often associated with specialization of microbial communities. Microbial communities being a critical player in the geochemical processes, makes it important to identify key environmental parameters that influence the community structure and its function.In this proect we study the influence of land use type and environmental parameters on the structure and function of microbial communities. The present study was conducted in an urban catchment, where the metal and pollutants levels are under allowable limits. The overall goal of this study is to understand the role of engineered physicochemical environment on the structure and function of microbial communities in urban storm-water canals. Microbial community structure was determined using PhyoChio (G3) Water and sediment samples were collected after a rain event from Sungei Ulu Pandan watershed of >25km2, which has two major land use types: Residential and industrial. Samples were analyzed for physicochemical variables and microbial community structure and composition. Microbial community structure was determined using PhyoChio (G3)
Project description:Catheter ablation is an effective treatment to prevent recurrence of Atrial fibrillation (AF) and can be used to maintain sinus rhythm and improve symptoms of AF, but to some extent it can cause a range of adverse effects associated with catheter ablation. Pulsed electric field is a newer treatment modality to replace catheter ablation for atrial fibrillation due to its fewer side effects. Different from radiofrequency ablation, which destroys diseased myocardial tissue by thermal energy, pulsed electric field ablation achieves the purpose of atrial fibrillation ablation by inducing damage to diseased myocardial cells through irreversible electroporation. However, some experimental parameters and mechanism of pulsed electric fields remain unclear.
2023-11-30 | GSE214387 | GEO
Project description:Anaerobic microbial community under magnetite-supplemented and voltage-applied environments
Project description:The circRNA, lncRNA, miRNA, and mRNA levels of both the direct-current electric field and control groups of adipose-derived stem cells were obtained by RNA sequencing.
Project description:Anthropogenic nitrogen (N) deposition may affect soil organic carbon (SOC) decomposition, thus affecting the global terrestrial carbon (C) cycle. However, it remains unclear how the level of N deposition affects SOC decomposition by regulating microbial community composition and function, especially C-cycling functional genes structure. We investigated the effects of short-term N addition on soil microbial C-cycling functional gene composition, SOC-degrading enzyme activities, and CO2 emission in a 5-year field experiment established in an artificial Pinus tabulaeformis forest on the Loess Plateau, China.