Article
Environmental Sciences
Yunmeng Pang, Jianlong Wang, Shengjie Li, Guodong Ji
Summary: This study revealed that the addition of sulfide (S2-) enhanced the coupling of denitrification with sulfide oxidation, leading to a shift in nitrate reduction pathways in freshwater lake sediments. The enrichment of Thiobacillus, a sulfide-oxidizing denitrifier, was found to play a key role in driving sulfide-driven denitrification, with differences observed in lakes with varying inherent organic carbon and sulfate levels. Additionally, internal sulfate release was seen to promote cooperation between sulfide-oxidizing denitrifiers and sulfate reducers in freshwater environments.
ENVIRONMENTAL POLLUTION
(2021)
Article
Multidisciplinary Sciences
Giovanni Pugliese, Johannes Ingrisch, Laura K. K. Meredith, Eva Y. Y. Pfannerstill, Thomas Kluepfel, Kathiravan Meeran, Joseph Byron, Gemma Purser, Juliana Gil-Loaiza, Joost van Haren, Katerina Dontsova, Juergen Kreuzwieser, S. Nemiah Ladd, Christiane Werner, Jonathan Williams
Summary: Severe drought and rewetting have a major impact on the capacity of rainforest soil to consume and emit volatile organic compounds (VOCs), affecting the atmospheric VOC budget and thereby atmospheric chemistry and climate.
NATURE COMMUNICATIONS
(2023)
Article
Environmental Sciences
Shengjie Li, Zhuo Jiang, Guodong Ji
Summary: The fate of nitrogen is influenced by competition between nitrate reduction pathways, with denitrification removing nitrogen to the atmosphere and DNRA retaining nitrate as ammonia. This study explored the impact of five sulfur forms as electron donors on nitrate fate. The results showed that thiosulfate had the highest nitrate reduction rate, stimulating denitrification and inhibiting DNRA. Elemental sulfur, on the other hand, stimulated both denitrification and DNRA. Metagenomic analysis revealed links between sulfur sources, nitrate reduction pathways, and microbial populations.
ENVIRONMENTAL POLLUTION
(2022)
Article
Biotechnology & Applied Microbiology
Moein J. Veshareh, Kasper U. Kjeldsen, Alyssa J. Findlay, Hamidreza M. Nick, Hans Roy, Angeliki Marietou
Summary: Microbial sulfate reduction is the main source of hydrogen sulfide in offshore oil reservoirs, with nitrate, nitrite, and perchlorate being potential inhibitors. Nitrate inhibits sulfide accumulation by promoting sulfate reduction and sulfide oxidation, while nitrite is the most efficient inhibitor. Further field scale studies are needed to confirm the effectiveness of perchlorate as a souring mitigation agent.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2021)
Article
Multidisciplinary Sciences
Grazia Guerriero, Maria Rosaria Mattei, Stefano Papirio, Giovanni Esposito, Luigi Frunzo
Summary: The aim of this study was to develop a mathematical model to assess the effect of soluble microbial products production and external carbon source addition on the performance of a sulfur-driven autotrophic denitrification process. The research found that cycle duration and COD injection time have significant impact on the reactor's performance. Under certain operational conditions, the SdAD process and SRB heterotrophic family dominate, while increasing the COD injection amount improves the activity of HD.
SCIENTIFIC REPORTS
(2022)
Article
Environmental Sciences
Shengjie Li, Yinhao Liao, Yunmeng Pang, Xiaoli Dong, Marc Strous, Guodong Ji
Summary: In long-term microcosm incubations, the addition of nitrate and Fe(II) can stimulate denitrification and dissimilatory nitrate reduction to ammonia (DNRA), leading to a higher nitrate reduction rate. Iron (II) contributes to the production of lepidocrocite, promoting the process of nitrate reduction.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Geochemistry & Geophysics
Yongjie Hu, Chunfang Cai, Dawei Liu, Yanyan Peng, Tianyuan Wei, Ziwen Jiang, Rongtu Ma, Lei Jiang
Summary: This study distinguishes pyrites generated by microbial sulfate reduction (MSR) from thermochemical sulfate reduction (TSR) based on analyses on barite, pyrite, calcite, and dolomite for carbon and sulfur isotopes, and REY compositions. MSR-derived pyrites show seawater-like REY patterns and superchondritic Y/Ho ratios, with wide range of delta S-34 values correlated with arsenic contents, possibly through cryptic sulfur cycles driven by arsenic. TSR-derived pyrites have non-seawater-like REY patterns, chondritic Y/Ho ratios, and small sulfur isotopic fractionations, with associated calcites showing LREE enrichment and negative delta C-13 values. The combination method from REY patterns, delta C-13 and delta S-34 values on micro-sized pyrite and associated calcites effectively distinguishes MSR from TSR.
Article
Engineering, Environmental
Duk-Min Kim, Woong-Lim Lim, Dae-Gyu Im, Jung-Woo Hwang, Soonyoung Yu, Seong-Taek Yun, Jeong-Hee Kim
Summary: The fractionation behaviors of Cu and Zn isotopes were studied in groundwater contaminated with petroleum and treated by oxidation. The study assessed the isotopes of Cu, Zn, SSO4, and H2O2 in wells contaminated with total petroleum hydrocarbons (TPH) and treated with H2O2 in 2021 and 2022. The results suggested the occurrence of sulfate reduction and precipitation of Cu sulfides, while the Zn isotopic fingerprint of sulfide precipitation may have been masked by sorption. The use of Cu isotopes in redox reactions proved advantageous due to the wider range of Cu isotopes.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Ecology
Lauren M. Seyler, Elizabeth Trembath-Reichert, Benjamin J. Tully, Julie A. Huber
Summary: The microbial community in the oceanic crustal aquifer plays a crucial role in organic carbon oxidation, showing activity, metabolic flexibility, and the ability to adapt to low oxygen conditions, with different anaerobic processes at varying depths within the aquifer.
Article
Soil Science
Jinsen Zheng, Kazumichi Fujii, Keisuke Koba, Wolfgang Wanek, Christoph Mueller, Anne B. Jansen-Willems, Yasuhiro Nakajima, Rota Wagai, Alberto Canarini
Summary: Based on a N-15 tracing experiment, we developed a new model (NO2Trace) that includes coupled nitrate reduction and nitrite re-oxidation. This model provides a better fit to the data compared to the Ntrace(Nitrite) tool. The results of this study have important implications for understanding nitrogen cycling and highlight the need for further research on separating nitrate and nitrite pools.
SOIL BIOLOGY & BIOCHEMISTRY
(2023)
Article
Microbiology
Rikuan Zheng, Shimei Wu, Chaomin Sun
Summary: Sulfur cycling in marine sediments is primarily driven by sulfate-reducing bacteria, leading to the production of reduced sulfide and insoluble metal sulfides. A novel sulfate-reducing bacterium, Pseudodesulfovibrio cashew SRB007, was isolated from deep-sea cold seeps and demonstrated strong resistance and removal capabilities against various heavy metal ions. The dissimilatory sulfate reduction by P. cashew SRB007 contributes to its ability to remove heavy metals through the formation of insoluble metal sulfides.
Article
Environmental Sciences
Chao Wang, Sen Qiao, Zhen Bi, Jiti Zhou
Summary: A novel nitrate reduction pathway by anammox biomass using intracellular carbon sources as electron donors was discovered, with the potential to enhance bacterial viability in different ecosystems and achieve complete nitrogen removal.
ENVIRONMENTAL RESEARCH
(2021)
Review
Chemistry, Multidisciplinary
Xiaoxuan Yang, Shreya Mukherjee, Thomas O'Carroll, Yang Hou, Meenesh R. Singh, Joseph A. Gauthier, Gang Wu
Summary: Unrestrained anthropogenic activities disrupt the global natural nitrogen cycle, leading to energy and environmental issues. Electrocatalytic nitrogen transformation offers a feasible and promising strategy for a sustainable nitrogen economy. By synergistically combining multiple nitrogen reactions, efficient renewable energy storage and conversion, nitrogen balance restoration, and environmental crisis remediation can be achieved.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Geochemistry & Geophysics
Shanggui Gong, Gareth Izon, Yongbo Peng, Yunchen Cao, Qiangyong Liang, Jorn Peckmann, Duofu Chen, Dong Feng
Summary: Our study highlights the importance of mass transport dynamics on the isotopic composition of pyrite, a factor that needs to be considered in any attempt to reconstruct the origin of early diagenetic pyrite and the paleoenvironmental setting with multiple sulfur isotopes.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Green & Sustainable Science & Technology
A. B. Mpofu, W. M. Kaira, G. A. Holtman, O. O. Oyekola, R. P. van Hille, P. J. Welz
Summary: A novel integrated biological system consisting of hybrid linear flow channel reactor (HLFCR) and anaerobic sequential batch reactor (AnSBR) was investigated for efficient treatment of tannery wastewater and recovery of sulfur and methane resources. The system demonstrated high feasibility for anaerobic digestion by utilizing single-stage and two-stage HLFCR topologies with different hydraulic retention times (HRT). The full-scale implementation of the system in a medium sized tannery had significant potential revenue from the sale of recovered resources and savings from reduced electricity demand and sludge disposal.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Environmental Sciences
Lars Schreiber, Nathalie Fortin, Alberto Mazza, Christine Maynard, Jessica Wasserscheid, Julien Tremblay, Kenneth Lee, Charles W. Greer
Summary: This study investigates the residual oil and habitat recovery in the Ste. Croix wetland in Eastern Canada after an experimental oil spill in 1999. The results show that after 21 years, the sediments in the test plots, regardless of the countermeasures taken, can be considered completely recovered.
ENVIRONMENTAL RESEARCH
(2023)
Article
Ecology
Mantas Sereika, Francesca Petriglieri, Thomas Bygh Nymann Jensen, Artur Sannikov, Morten Hoppe, Per Halkjaer Nielsen, Ian P. G. Marshall, Andreas Schramm, Mads Albertsen
Summary: Cable bacteria are centimeter-long filamentous bacteria capable of long-distance electron transfer. They are currently classified into two candidate genera: Candidatus Electronema, found in freshwater, and Candidatus Electrothrix, found in saltwater. To address the lack of complete genomic information, researchers performed Nanopore long-read and Illumina short-read shotgun sequencing, resulting in the recovery of multiple cable bacteria genomes. Phylogenomic analysis classified two circular genomes as novel species: Ca. Electronema halotolerans and Ca. Electrothrix laxa. The discovery of Ca. Electronema halotolerans in brackish-water sediment suggests its evolutionary link between marine and freshwater cable bacteria lineages.
Article
Biotechnology & Applied Microbiology
Ping Gao, Xiaoting Zhang, Xiaomei Huang, Zhiyi Chen, Angeliki Marietou, Lars Holmkvist, Lingyun Qu, Kai Finster, Xianzhe Gong
Summary: The genomes of three species in the genus Desulfofaba were sequenced, and their metabolic potentials were compared. It was found that Desulfofaba species have the ability to oxidize propionate to acetate and CO2, and play an important role in nitrogen cycling. They also have genes to cope with oxygen and oxidative stress. This study reveals the importance of Desulfofaba genus, particularly in the biogeochemical cycling of carbon.
Article
Chemistry, Physical
Svend J. Knak Jensen, Mikkel Bregnhoj, Jan Thogersen, Per Nornberg, Anders Bodholt Nielsen, Jorgen Skibsted, Kai Finster
Summary: Mechanical activation of quartz grains in a dry atmosphere leads to triboelectric charging, allowing for quantitative capture of CO2. A proposed mechanism suggests that CO2 is inserted into the quartz lattice, forming an anchored CO3 moiety. Solid-state 13C NMR measurements confirm the predicted chemical shifts of this product.
CHEMICAL PHYSICS LETTERS
(2023)
Article
Environmental Sciences
Blake E. Hunnie, Lars Schreiber, Charles W. Greer, Gary A. Stern
Summary: The Arctic presents unique challenges for oil spill research due to extreme conditions. The Baffin Island Oil Spill (BIOS) project revisited sites nearly 40 years later to gather long-term monitoring data. The samples collected showed potentially toxic levels of PAHs, indicating the continued hazard posed by the weathered crude oil residues.
ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Environmental
Ruby Pyke, Nathalie Fortin, Jessica Wasserscheid, Julien Tremblay, Lars Schreiber, Marie-Josee Levesque, Stephanie Messina-Pacheco, Lyle Whyte, Feiyue Wang, Kenneth Lee, David Cooper, Charles W. Greer
Summary: The microbial response and biodegradability of residues from in-situ burning were studied using microcosms. The results showed that the concentrations of hydrocarbons and polycyclic aromatic hydrocarbons (PAHs) in the residues decreased, especially in residues generated from burning weathered diesel.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Multidisciplinary Sciences
Laura Eme, Daniel Tamarit, Eva F. Caceres, Courtney W. Stairs, Valerie De Anda, Max E. Schoen, Kiley W. Seitz, Nina Dombrowski, William H. Lewis, Felix Homa, Jimmy H. Saw, Jonathan Lombard, Takuro Nunoura, Wen-Jun Li, Zheng-Shuang Hua, Lin-Xing Chen, Jillian F. Banfield, Emily St John, Anna-Louise Reysenbach, Matthew B. Stott, Andreas Schramm, Kasper U. Kjeldsen, Andreas P. Teske, Brett J. Baker, Thijs J. G. Ettema
Summary: Through analysis of an expanded genomic sampling of Asgard archaea, this study reveals that eukaryotes are placed within Asgard archaea as a well-nested clade and a sister lineage to Hodarchaeales. The study also shows that genome evolution in Asgard archaea involved more gene duplication and fewer gene loss events compared to other archaea.
Article
Multidisciplinary Sciences
Jesper J. Bjerg, Jamie J. M. Lustermans, Ian P. G. Marshall, Anna J. Mueller, Signe Brokjaer, Casper A. Thorup, Paula Tataru, Markus Schmid, Michael Wagner, Lars Peter Nielsen, Andreas Schramm
Summary: Cable bacteria are filamentous microbes that conduct electrons via internal wires and couple sulfide oxidation between sediment layers. Other bacteria swarm around the anoxic part of oxygen-respiring cable bacteria and seem to transfer electrons to cable bacteria via soluble metabolites. This association and interaction with diverse partners may explain how oxygen from cable bacteria affects microbial communities and processes in anoxic environments.
NATURE COMMUNICATIONS
(2023)
Article
Microbiology
Farhad M. Panah, Katrine D. Nielsen, Gavin L. Simpson, Anna Schonherz, Andreas Schramm, Charlotte Lauridsen, Tina S. Nielsen, Ole Hojberg, Marlene Fredborg, Stig Purup, Nuria Canibe
Summary: This study investigated the effect of a westernized diet on colonic bacterial composition and found that it may increase the risk of ulcerative colitis by reducing the abundance of beneficial bacteria, increasing the abundance of pathogens, and increasing the concentration of microbial metabolites.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Microbiology
Jamie J. M. Lustermans, Jesper J. J. Bjerg, Laurine D. W. Burdorf, Lars Peter Nielsen, Andreas Schramm, Ian P. G. Marshall
Summary: Cable bacteria are filamentous bacteria that play a major role in sediment geochemistry and microbial communities. Our study investigated the timing and drivers of flocking in a culture of freshwater cable bacteria. We found that flocking always occurred, regardless of the overall abundance or activity of the cable bacteria. Flocking was linked to the individual cable bacteria's electron conducting activity.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Astronomy & Astrophysics
Martin Kobek-Kjeldager Sigvartsson, Ebbe Norskov Bak, Per Nornberg, Svend J. Knak Jensen, Jan Thogersen, Mikkel Begnhoj, Kai Finster
Summary: The minerals on the Martian surface have the ability to oxidize organic compounds, affecting the habitability of Mars. Iron-containing minerals are cytotoxic to bacteria and can change the pH of water.
Article
Engineering, Environmental
Hesham Amin, Tina Santl-Temkiv, Christine Cramer, Kai Finster, Francisco Gomez Real, Thorarinn Gislason, Mathias Holm, Christer Janson, Nils Oskar Jogi, Rain Jogi, Andrei Malinovschi, Ian P. G. Marshall, Lars Modig, Dan Norback, Rajesh Shigdel, Torben Sigsgaard, Cecilie Svanes, Hulda Thorarinsdottir, Inge M. Wouters, Vivi Schlunssen, Randi J. Bertelsen
Summary: There is limited research on the factors influencing the indoor bacterial community. This study investigated the airborne microbiomes in the homes of 1038 participants from five cities in Northern Europe and identified environmental factors that affect the composition of indoor bacterial communities. The results showed that households in Tartu and Aarhus had higher bacterial load and diversity than those in Bergen and Reykjavik, possibly due to elevated concentrations of outdoor bacterial taxa associated with low precipitation and high wind speeds.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Dentistry, Oral Surgery & Medicine
M. F. Kristensen, M. B. Lund, A. Schramm, E. Frandsen Lau, S. Schlafer
Summary: This study comprehensively analyzed the effect of whole saliva flow on microscale pH in dental biofilms using pH ratiometry. The results showed the presence of steep pH gradients and a positive correlation between pH drops and biofilm thickness. Stimulated saliva flow increased biofilm pH but did not balance the vertical and horizontal pH gradients. Dental biofilms with different pH responses had significantly different bacterial community composition.
JOURNAL OF DENTAL RESEARCH
(2023)
Article
Environmental Sciences
Blake E. Hunnie, Lars Schreiber, Charles W. Greer, Gary A. Stern
Summary: The Baffin Island Oil Spill (BIOS) Project was conducted in the early 1980s to study the fate of crude oil in the Arctic. In 2019, the study sites were revisited and oiled sediment samples were collected. Analysis showed the presence of petroleum hydrocarbons in various concentrations, with extensive weathering processes observed in certain hydrocarbon groups since the previous study in 2001.
MARINE POLLUTION BULLETIN
(2023)
Article
Microbiology
Jeanine S. Geelhoed, Casper A. Thorup, Jesper J. Bjerg, Lars Schreiber, Lars Peter Nielsen, Andreas Schramm, Filip J. R. Meysman, Ian P. G. Marshall
Summary: In this study, we identified a novel species of marine cable bacteria with a large diameter, named Candidatus Electrothrix gigas. The genomes of this species contain a gene encoding a novel actin-like protein (Bbp) that is also found in other giant bacteria. This suggests that there may be a genetic basis for large cell size. The Bbp protein may have a structural role in the cell or potentially facilitate intracellular transport.
MICROBIOLOGY SPECTRUM
(2023)