{"type": "FeatureCollection", "facets": {"type": {"type": "terms", "property": "type", "buckets": [{"value": "Journal Article", "count": 1}]}, "soil_chemical_properties": {"type": "terms", "property": "soil_chemical_properties", "buckets": []}, "soil_biological_properties": {"type": "terms", "property": "soil_biological_properties", "buckets": []}, "soil_physical_properties": {"type": "terms", "property": "soil_physical_properties", "buckets": [{"value": "soil temperature fluctuations", "count": 1}]}, "soil_classification": {"type": "terms", "property": "soil_classification", "buckets": []}, "soil_functions": {"type": "terms", "property": "soil_functions", "buckets": []}, "soil_threats": {"type": "terms", "property": "soil_threats", "buckets": []}, "soil_processes": {"type": "terms", "property": "soil_processes", "buckets": []}, "soil_management": {"type": "terms", "property": "soil_management", "buckets": []}, "ecosystem_services": {"type": "terms", "property": "ecosystem_services", "buckets": []}}, "features": [{"id": "10.1016/j.ijhydene.2019.01.256", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-04T16:16:38Z", "type": "Journal Article", "created": "2019-02-28", "title": "Impacts of short-term temperature fluctuations on\u00a0biohydrogen production and resilience of\u00a0thermophilic microbial communities", "description": "Abstract   Anaerobic microflora enriched for dark fermentative H2 production from a mixture of glucose and xylose was used in batch cultivations to determine the effects of sudden short-term temperature fluctuations on H2 yield and microbial community composition. Batch cultures initially cultivated at 55\u00a0\u00b0C (control) were subjected to downward (from 55\u00a0\u00b0C to 35\u00a0\u00b0C or 45\u00a0\u00b0C) or upward (from 55\u00a0\u00b0C to 65\u00a0\u00b0C or 75\u00a0\u00b0C) temperature shifts for 48\u00a0h after which, each culture was transferred to a fresh medium and cultivated again at 55\u00a0\u00b0C for two consecutive batch cycles. The average H2 yield obtained during the first cultivation at 55\u00a0\u00b0C was 2.1\u00a0\u00b1\u00a00.14\u00a0mol H2 mol\u22121 hexose equivalent. During the temperature shifts, the obtained H2 yields were 1.8\u00a0\u00b1\u00a00.15, 1.6\u00a0\u00b1\u00a00.27 and 1.9\u00a0\u00b1\u00a00.00\u00a0mol H2 mol\u22121 hexose equivalent at 35\u00a0\u00b0C, 45\u00a0\u00b0C and 65\u00a0\u00b0C, respectively, while no metabolic activity was observed at 75\u00a0\u00b0C. The sugars were completely utilized during the 48\u00a0h temperature shift to 35\u00a0\u00b0C but not at 65\u00a0\u00b0C and 45\u00a0\u00b0C. At the end of the second cycle after the different temperature shifts, the H2 yield obtained was 96.5, 91.6, 79.9 and 54.1% (second cycle after temperature shift to 35\u00a0\u00b0C, 45\u00a0\u00b0C, 65\u00a0\u00b0C and 75\u00a0\u00b0C, respectively) when compared to the average H2 yield produced in the control at 55\u00a0\u00b0C. Characterization of the microbial communities present in the control culture at 55\u00a0\u00b0C showed the predominance of Thermoanaerobacteriales, Clostridiales and Bacilliales. The microbial community composition differed based on the fluctuation temperature with Thermoanaerobacteriales being most dominant during the upward temperature fluctuations and Clostridiales being the most dominant during the downward temperature fluctuations.", "keywords": ["[SDE] Environmental Sciences", "2. 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