Article
Environmental Sciences
Zhuqiu Sun, Jinying Xi, Marvin Yeung, Lichao Lu
Summary: This study investigated the effects of two quorum sensing (QS) enhancement methods on the performance and biofilm of biofilters treating chlorobenzene. The results showed that adding exogenous AHLs had a more significant enhancing effect on biofilm, while AHLs producing bacteria helped improve bacterial community diversity.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Zhuqiu Sun, Bairen Yang, Marvin Yeung, Jinying Xi
Summary: The addition of exogenous AHLs and AHL-producing bacteria in biofilters treating gaseous toluene at a low temperature significantly improved the removal and mineralization efficiency of VOCs. These enhancements also improved the biofilm characteristics and biomass distribution, leading to improved performance of the biofilters.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Agricultural Engineering
Yuxi Yan, Jiao Yang, Zhongyang Zhu, Boqiang Jin, Rencheng Zhu, Shunyi Li
Summary: The study found that adding 7.5% PEG-600 significantly improved the toluene removal efficiency of the biofilter, with a maximum elimination capacity of 152 g/(m3?h). Additionally, the introduction of PEG-600 enhanced the structural stability of the biofilm and increased the abundance of Pseudomonas and Steroidobacter in the microbial community.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Zhuqiu Sun, Bairen Yang, Marvin Yeung, Jinying Xi
Summary: The study found that exogenous acylated homoserine lactones (AHLs) can significantly enhance biofilm growth and increase biofilm coverage in biofilters. However, exogenous AHLs did not have a significant effect on the removal efficiency of volatile organic compounds (VOCs) in the biofilter. These findings are important for guiding the application of exogenous AHLs in VOC biofilters.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2023)
Article
Engineering, Environmental
Dorothee L. Kurz, Eleonora Secchi, Roman Stocker, Joaquin Jimenez-Martinez
Summary: The functioning of natural and engineered porous media relies on the interplay between biochemical processes and hydrodynamics. In such environments, biofilms often form, altering the distribution of fluid flow velocities and affecting their permeability. However, the control of biofilm clustering and resulting permeability heterogeneity is not well understood, limiting predictive abilities for biofilm-porous medium systems.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Jiaju Fu, Bin Gao, Hongxia Xu, Shefeng Hao, Jinghua Ren, Jichun Wu, Yuanyuan Sun
Summary: This study investigated the impact of biofilm, specifically Gram-positive Bacillus subtilis (BS), Gram-negative Pseudomonas aeruginosa (PA), and wild microbiota (WM), on the transport of perfluorooctanoic acid (PFOA) in saturated sand columns. The results showed that biofilm increased the retention of PFOA, but the effects varied depending on the bacterial species. In addition, the influence of ionic strength on PFOA transport differed among the biofilm types. The findings of this study have important implications for the risk assessment and remediation of PFOA contamination.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Yangyang Tang, Cong Tao, Zheng Zhang, Song Liu, Fulin Dong, Duohuai Zhang, Jinchang Zhang, Xiaoling Wang
Summary: Understanding the mechanism of biofilm distribution and detachment is crucial for water treatment and prevention of clogging in porous media. This study reveals that bacterial aggregation in smaller pores leads to biofilm formation and blockage. The detachment of biofilm is correlated with its morphology and permeability, and occurs through internal detachment or external erosion.
WATER SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Biomedical
Hanfeng Zhai, Jingjie Yeo
Summary: Designing customizable engineered porous materials for controllable biofilm transportation properties can improve the applications of biofilms in pollution alleviation, material self-healing, and energy production. We use Bayesian optimization and individual-based modeling to optimize the designs, and find that Bayesian optimization is more efficient than the traditional grid search method. Comparison study shows that porous materials can enhance biofilm growth and transportability.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Agricultural Engineering
Yuxi Yan, Bixi Zhao, Jiao Yang, Jing Zhang, Shunyi Li, Yu Xia
Summary: The feasibility of three methods to enhance the recovery performance of biofilter was evaluated. The addition of Polyethylene glycol-600 showed quick recovery of removal efficiency, while Bacteroidetes-specific antibiotic was effective only as a one-time shot. The addition of Pseudomonas putida achieved the maximum elimination capacity.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Raoul Djou Fopa, Carlo Bianco, Nathaly Lopes Archilha, Anderson Camargo Moreira, Tannaz Pak
Summary: Nanoremediation is a new technology that uses nanoparticles to degrade groundwater contaminants in-situ. This study examines the transportation of zero-valent iron nanoparticles in porous media and finds that particle size and composition affect their mobility and retention. The experiment also shows that nanoparticle injection changes the pore structure and reduces porosity and permeability.
JOURNAL OF CONTAMINANT HYDROLOGY
(2023)
Article
Engineering, Civil
Ping Yang, Shujun Ye, Brent Sleep
Summary: This study analyzed the impact of microbial growth and methane generation on groundwater flow during anaerobic bioremediation. The results showed that microbial growth and biogenic gas production can increase the dispersivity of groundwater. Model predictions of dispersivity changes differed from actual values.
JOURNAL OF HYDROLOGY
(2021)
Article
Water Resources
Milad Hosseini, Majid Siavashi, Milad Shirbani, Mohaddeseh Mousavi Nezhad
Summary: Simulation of flow at the pore scale is crucial for understanding fluid behavior in porous media. This study investigates the effect of the magic parameter on simulation results by considering errors in micro-CT images, and compares the results with the Navier-Stokes method. The study also presents a criterion for estimating the error amplitude of flow characteristics due to micro-CT imaging. The findings show that the magic parameter can accurately simulate complex geometries with minimal error.
ADVANCES IN WATER RESOURCES
(2023)
Article
Environmental Sciences
Xiaozhong Huang, Yi Wang, Wenhuai Wang, Binjuan Li, Kexin Zhao, Xiaomei Kou, Shizhang Wu, Tian Shao
Summary: This study proposes a feasible scheme for treating municipal sewage using the SNAD process in a single-stage biofilter reactor. The results show that high removal efficiency of NH4+-N, TN, and SCOD can be achieved under proper operating conditions.
Article
Radiology, Nuclear Medicine & Medical Imaging
Haruto Sugawara, Toshihiro Furuta, Akira Sumiyoshi, Megumi Iiyama, Masaru Kamitani, Aiko Suzuki, Arao Murakami, Osamu Abe, Ichio Aoki, Hiroyuki Akai
Summary: In this study, a CT lymphangiography method was established in mice via direct lymph node puncture. The results showed that the contrast ratios and visual assessment scores of lymph nodes and lymphatic vessels were significantly better in the direct puncture group compared to the CT or MR interstitial injection method.
EUROPEAN RADIOLOGY
(2023)
Article
Environmental Sciences
Shuyi Chu, Qian Qu, Keke Pan, Yunjie Xu, Jibo Xiao
Summary: A new Fe-C porous filter material was prepared using dredged sediment of river as raw material, with optimal technological conditions identified through experiments. The resulting filter demonstrated good performance in removing pollutants from river water, making it a viable alternative material for purification purposes.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Biology
Dominique Rauly, Mederic Vindret, Eric Chamberod, Jean M. F. Martins, Pascal Xavier
BIOELECTROMAGNETICS
(2020)
Article
Ecology
Mylene Hugoni, Naoise Nunan, Jean Thioulouse, Audrey Dubost, Danis Abrouk, Jean M. F. Martins, Deborah Goffner, Claire Prigent-Combaret, Genevieve Grundmann
Summary: Research has shown that there are differences in bacterial composition at the small scale among different soils, with one soil exhibiting a satellite distribution mode and the other three showing bimodal distributions. Multiple core taxa were found across the four soils, with 8 OTUs common to all four sites. These results highlight the importance of analyzing small-scale spatial distribution for understanding ecosystem functioning.
Article
Microbiology
Abdoulaye Samake, Jean M. F. Martins, Aurelie Bonin, Gaelle Uzu, Pierre Taberlet, Sebastien Conil, Olivier Favez, Alexandre Thomasson, Benjamin Chazeau, Nicolas Marchand, Jean-Luc Jaffrezo
Summary: This study examines the relationship between Sugar Compounds (SC) concentrations in PM10 and the structure of airborne microbial communities at three sites in France under different climates. Results show that temporal changes in PM10-SC levels are associated with specific taxa of airborne fungi and bacteria, which vary significantly between the climatic regions studied. The study also finds that microbial communities associated with SC concentrations in PM10 remained stable in a rural area over a consecutive 2-year period.
FRONTIERS IN MICROBIOLOGY
(2021)
Article
Environmental Sciences
Marie Simonin, Jean M. F. Martins, Gaelle Uzu, Lorenzo Spadini, Aline Navel, Agnes Richaume
Summary: This study indicates that TiO2-NPs have very low mobility in soil, while CuO-NPs are mobile in all soils. The transport of CuO-NPs is mainly controlled by solutes dissolved in soil solution.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
D. Archundia, J. M. F. Martins, F. Lehembre, M-C Morel, C. Duwig
Summary: This study investigates the biodegradation and impact of SMX in high altitude soils, showing lower degradation compared to lowland soils. SMX significantly alters the structure and composition of soils at high altitudes, with Actinobacter phylum showing high sensitivity to SMX. The presence of SMX resistance genes appears to be related to irrigation with wastewater carrying the studied resistance genes.
Article
Microscopy
Sabine Rolland du Roscoat, Tomislav Ivankovic, Nicolas Lenoir, Svjetlana Dekic, Jean M. F. Martins, Christian Geindreau
Summary: Characterizing bacterial biofilm growth in porous media is essential for biofouling research, and X-ray microtomography has been a useful tool. However, concerns over contrast agent use have led researchers to explore neutron tomography as an alternative imaging method. Results showed that neutron tomography provided consistent biofilm distribution observations with X-ray microtomography, but the images were too noisy for quantitative measurements.
JOURNAL OF MICROSCOPY
(2022)
Article
Engineering, Chemical
Iheb Haffar, Pierre Latil, Frederic Flin, Christian Geindreau, Francois Bonnel, Nicolas Petillon, Pierre-Colin Gervais, Vincent Edery
Summary: This study develops two characterization methods for ice particles in jet fuel and investigates the influence of process parameters on particle properties. The results show that increasing circulation time leads to smaller particle sizes, while the effect of water concentration remains inconclusive.
Article
Food Science & Technology
Amira Zennoune, Pierre Latil, Fatou-Toutie Ndoye, Frederic Flin, Jonathan Perrin, Christian Geindreau, Hayat Benkhelifa
Summary: In this study, the microstructural evolution of a non-reactive porous model food (sponge cake) during freezing was investigated using synchrotron X-ray microtomography (mu-CT) and cryo-scanning electron microscopy (Cryo-SEM). Different freezing rates impacted the ice formation and location, volume fractions of each phase, as well as ice shape characteristics in the samples. The image analysis method based on grey level effectively segmented the air, ice, and starch phases in the frozen samples.
Article
Engineering, Manufacturing
C. Balbinot, F. Martoia, P. J. J. Dumont, L. Orgeas, J-F Bloch, S. Rolland du Roscoat, E. Boller, F. Flin, P. Carion, P. Latil
Summary: Capillary-driven impregnation phenomena in fibre bundles during composite materials processing were characterized using synchrotron X-ray microtomography. The study found significant variations in local contact angles even in quasi-static situations. The results also showed that transverse capillary forces at the fibre scale were comparable to longitudinal capillary forces. These findings support the relevance of a mesoscale capillary pressure model for fibre bundles.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Environmental Sciences
Nico Hachgenei, Guillaume Nord, Lorenzo Spadini, Henri Mora, Francois Courvoisier, Jean-Francois Sutra, Jean-Pierre Vandervaere, Cedric Legout, Marie-Christine Morel, Jean Martins, Anne Lespine, Celine Duwig
Summary: Many contaminants of agricultural origin are released into rural environments, particularly at the soil surface. However, there is limited knowledge about their fate and transfer within and between environmental compartments. Therefore, a device and protocol for sampling intact soil monoliths without heavy machinery has been proposed to investigate the transfer of trace organic contaminants through topsoils.
VADOSE ZONE JOURNAL
(2022)
Article
Engineering, Chemical
Pierre Latil, Amira Zennoune, Fatou-Toutie Ndoye, Frederic Flin, Christian Geindreau, Hayat Benkhelifa
Summary: X-ray tomography was used to characterize microstructural changes in a sponge cake during freezing and subsequent storage. The results showed that ice crystals were located on the pore surface and not inside the cake matrix. The size of ice crystals increased linearly during thermal cycling, while the number of ice crystals reached a plateau, suggesting a recrystallization phenomenon.
JOURNAL OF FOOD ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Pete D. Akers, Joel Savarino, Nicolas Caillon, Aymeric P. M. Servettaz, Emmanuel Le Meur, Olivier Magand, Jean Martins, Cecile Agosta, Peter Crockford, Kanon Kobayashi, Shohei Hattori, Mark Curran, Tas van Ommen, Lenneke Jong, Jason L. Roberts
Summary: This article introduces an alternative proxy for surface mass balance (SMB) in Antarctic ice cores based on photolytic fractionation of nitrogen isotopes in nitrate. By applying this proxy approach to nitrate observed at 114 sites in East Antarctica, the authors reconstruct 700 years of SMB changes and provide SMB values that reflect the immediate local environment independently.
NATURE COMMUNICATIONS
(2022)
Article
Ecology
Christoph Keuschnig, Jean M. F. Martins, Aline Navel, Pascal Simonet, Catherine Larose
Summary: Micro-scale analysis of microbes in soil is crucial for understanding microbial organization, interactions, and ecosystem functioning. This study used a gentle soil fractionation method to examine fungal and bacterial communities as well as nitrogen cycling potentials in different particle size fractions. The results showed that microbial community structures changed below 20 μm, suggesting the importance of studying sub-fractions of micro-aggregates to understand microbial interactions.
FRONTIERS IN ECOLOGY AND EVOLUTION
(2022)
Article
Microbiology
Jennifer Hellal, Lise Barthelmebs, Annette Berard, Aurelie Cebron, Giulia Cheloni, Simon Colas, Cristiana Cravo-Laureau, Caroline De Clerck, Nicolas Gallois, Marina Hery, Fabrice Martin-Laurent, Jean Martins, Soizic Morin, Carmen Palacios, Stephane Pesce, Agnes Richaume, Stephane Vuilleumier
Summary: Environmental pollution is a major challenge faced by humanity, and microorganisms play crucial roles in the degradation, transformation, and transfer of pollutants. Microbial ecotoxicology is an expanding research area that aims to understand the interactions between pollutants and microorganisms. This perspective paper provides an overview of the research challenges in microbial ecotoxicology and highlights areas where further efforts are needed.
FEMS MICROBIOLOGY ECOLOGY
(2023)
Article
Environmental Sciences
Abdoulaye Samake, Aurelie Bonin, Jean-Luc Jaffrezo, Pierre Taberlet, Samuel Weber, Gaelle Uzu, Veronique Jacob, Sebastien Conil, Jean M. F. Martins
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2020)
