Article
Engineering, Chemical
Bing Guo, Zhiya Sheng, Yang Liu
Summary: The study found that activated sludge microbial communities were impacted by seasonal variation, disturbance-recovery events, and the presence of separated small aggregates (SAG). Results confirmed that SAG experienced a higher immigration impact compared to AS. By incorporating SAG community segregation into the model, the contribution of influent immigration to community disturbance-recovery was shown to increase.
Article
Engineering, Environmental
Zhengzhe Zhang, Yu Zhang, Zhijian Shi, Yinguang Chen
Summary: This study unraveled the accumulation of hydroxylamine in various nitrification systems and its potential mechanism in regulating the subsequent denitrification process. Hydroxylamine immediately induced nitrite accumulation by inhibiting the activities of nitrite reductases in activated sludge. Long-term exposure to hydroxylamine accelerated the functional transformation from denitrification to denitratation under low C/N conditions. Genomic analysis revealed the enrichment of a denitrifier species Thauera aminoaromatica TJ127, which was responsible for acetate storage and nitrate reduction. These findings suggest that hydroxylamine released during nitrification may interfere with denitrification metabolism, but its continuous accumulation is beneficial for achieving denitratation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Microbiology
Yuan Lin, Liye Wang, Ke Xu, Kan Li, Hongqiang Ren
Summary: The study identified heterogeneous heavy metal-resistance mechanisms among different taxa in DPRS, highlighting the importance of understanding individual microorganisms' heterogeneity in contributing to metabolic versatility and robustness of microbiomes in dynamic environments. This insight is crucial for manipulating microbial adaptation under adverse environmental stimuli.
Article
Green & Sustainable Science & Technology
Yingying Yang, Xueyang Hu, Xinyu Zhang, Xiurong Chen, Xiao Wei, Zhichong Chen, Hao Gu, Shanshan Linghu, Yuqing Gao
Summary: This study investigates the degradation of resorcinol in domestic coal gas wastewater by aerobic activated sludge. The results show that the effluent resorcinol concentration and chemical oxygen demand concentration tend to increase and then decrease with increasing influent resorcinol concentration. The study also identifies the dominant bacterial population involved in the degradation process.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Microbiology
Donghyeok Seol, Jin Soo Lim, Samsun Sung, Young Ho Lee, Misun Jeong, Seoae Cho, Woori Kwak, Heebal Kim
Summary: The recent development of long-read sequencing platforms has allowed for higher taxonomic resolution in exploring bacterial community structures. MIrROR is a database and analysis tool for metataxonomics using the bacterial 16S-ITS-23S rRNA operon region, providing users with a mapping strategy for taxonomic profiling. Benchmark tests have shown promising results in terms of coverage and accuracy, making MIrROR a valuable platform for high-resolution metagenomics analysis using cost-effective sequencers like MinION. The importance of MIrROR lies in satisfying the need for a database and tools in the field of metabarcoding, particularly for the 16S-ITS-23S rRNA operon region.
MICROBIOLOGY SPECTRUM
(2022)
Article
Ecology
Yongjian Chen, Julia W. Neilson, Priyanka Kushwaha, Raina M. Maier, Albert Barberan
Summary: Through metagenomic analysis of copiotrophic and oligotrophic microbial communities in arid-hyperarid regions, it was found that vegetated soils harbor microbial communities with higher ecological traits and growth rates, while oligotrophic microbial communities in bare soils possess a higher proportion of genes with unknown functions.
Article
Engineering, Environmental
Xianli Yang, Jingnan Yang, Xuran Liu, Qing Wang, Dongke Liu, Dongbo Wang
Summary: The widespread use of pharmaceuticals has raised concerns about their potential environmental effects. Previous studies have shown that most of the pharmaceuticals investigated had harmful effects on wastewater or sludge treatment. However, this study found that carbamazepine at environmentally relevant levels increased hydrogen production from anaerobic fermentation of waste activated sludge.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Microbiology
Ying Wang, Roland C. Wilhelm, Tami L. Swenson, Anita Silver, Peter F. Andeer, Amber Golini, Suzanne M. Kosina, Benjamin P. Bowen, Daniel H. Buckley, Trent R. Northen
Summary: Microorganisms' life-history strategies have a significant impact on the processing of organic carbon, which in turn influences microbial interactions and carbon cycling in soils. High rrn isolates have a greater potential for resource competition and tend to consume a wider variety and larger quantity of substrates compared to low rrn isolates. By connecting bacterial life-history strategies, genomic traits, and metabolism, this study advances our understanding of the links between bacterial community composition and the transformation of carbon in soils.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Engineering, Environmental
Renzhang Lin, Hao Wu, Xiangyu Kong, Hao Ren, Zhenmei Lu
Summary: The lack of universal indicators for predicting microbial biodegradation potential and assessing remediation effects limits the generalization of bioremediation. A meta-analysis based on 1275 samples from 26 hydrocarbon-related studies revealed a positive relationship between the microbial hydrocarbon biodegradation level and the community-level rrn copy number in soil, seawater and culture. The treatment combining straw with resuscitation-promoting factor (Rpf) exhibited the highest community-level rrn copy number and the most effective biodegradation compared with other treatments, and the initial total petroleum hydrocarbon (TPH) content (20,000 mg kg-1) was reduced by 67.67% after 77 days of incubation. The TPH biodegradation rate was positively correlated with the average community-level rrn copy number (p = 0.001, R2 = 0.5781). Both meta and community analyses showed that rrn copy number may reflect the potential of hydrocarbon degradation and microbial dormancy. Our findings provide insight into the applicability of the community-level rrn copy number to assess bacterial biodegradation for pollution remediation.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Ruyin Liu, Zong Li, Ganghua Han, Shujuan Cun, Deyin Hou, Zhisheng Yu, Kai Xue, Xinchun Liu
Summary: The temporal dynamics of lytic and temperate phages in a laboratory-scale activated sludge reactor with a sludge bulking issue were investigated. It was found that lytic phages were more active while temperate phages showed low activity. The study also revealed a strong correlation between sludge concentration and free virus and temperate phage communities, indicating a microbial density-dependent virus dynamics.
Article
Engineering, Environmental
Mohammadreza Kamali, Tejraj M. Aminabhavi, Luis A. C. Tarelho, Rens Hellemans, Joren Cuypers, Isabel Capela, Maria Elisabete V. Costa, Raf Dewil, Lise Appels
Summary: The study showed that acclimatization of activated sludge with pinewood biochar significantly enhanced the biodegradation rate of phenol. The presence of biochar led to increased specific biodegradation rates and improved microbial colonization and growth, demonstrating the positive effects of biochar in the treatment of synthetic effluents.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Guanying Wang, Guanglei Qiu, Jian Wei, Zhuang Guo, Weiye Wang, Xiaoling Liu, Yonghui Song
Summary: With the development of industries, explosion accidents occur frequently during production, transportation, usage, and storage of hazardous chemicals. The activated carbon-activated sludge (AC-AS) process shows promising potential in efficiently treating wastewater with high concentrations of toxic compounds. In this study, AC and AS were used to treat wastewater from an explosion accident, resulting in increased removal efficiency and shortened treatment time compared to traditional processes. Metagenomic analysis and spectroscopy were used to explore the enhancement mechanism of AC on AS, revealing the important roles of certain bacteria and genes in pollutant degradation. This study demonstrates the universal characteristics of the AC-AS process for treating wastewater with high levels of organic matter and toxicity.
ENVIRONMENTAL RESEARCH
(2023)
Article
Multidisciplinary Sciences
Songwei Ni, Baiyuan Li, Kaihao Tang, Jianyun Yao, Thomas K. Wood, Pengxia Wang, Xiaoxue Wang
Summary: The study reveals that the type II TA system, Pseudoalteromonas rubra plasmid toxin-antitoxin PrpT/PrpA, directly controls plasmid replication by acting as a negative regulator. The antitoxin PrpA binds to iterons in the plasmid origin to inhibit the binding of the replication initiator, preventing overreplication of the plasmid. This TA system is conserved and widespread on many conjugative plasmids.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Review
Microbiology
Melia Bonnamy, Stephane Blanc, Yannis Michalakis
Summary: The replication of plant-infecting single-stranded DNA viruses, Geminiviridae and Nanoviridae, involves rolling-circle replication (RCR) and recombination-dependent replication (RDR) mechanisms. RCR relies on a virus-encoded Replication-associated protein (Rep) and specific sequences called iterons, while RDR is also observed in some double-stranded DNA viruses. This article provides a synthesis of the current understanding of these replication modes and discusses the potential role of gene copy number regulation in viral gene expression.
Article
Environmental Sciences
Jiateng Liu, Guangyu Chu, Qianzhi Wang, Zhiming Zhang, Shuailing Lu, Zonglian She, Yangguo Zhao, Chunji Jin, Liang Guo, Junyuan Ji, Mengchun Gao
Summary: The effect of salinity on the nitrogen removal performance and microbial community of activated sludge was investigated in a sequencing batch reactor. The study found that low salinity has a minimal effect on the nitrification performance of activated sludge, but high salinity can lead to a decline in nitrogen removal performance. Salinity inhibits microbial activity and affects the transport pathway. Osmotic imbalance is the main cause of decreased nitrogen removal performance in activated sludge at high salinity.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Esteban Oreliana, Carol Davies-Sala, Leandro D. Guerrero, Ignacio Varde, Melisa Altina, Maria Cielo Lorenzo, Eva L. Figuerola, Rodrigo M. Pontiggia, Leonardo Erijman
WATER SCIENCE AND TECHNOLOGY
(2019)
Article
Ecology
Leandro D. Guerrero, Maria Perez, Esteban Orellana, Mariana Piuri, Cecilia Quiroga, Leonardo Erijman
Summary: This study investigated the dynamics of interaction between Gordonia and their phages in a full-scale wastewater treatment plant over a three-year period, revealing the coevolution processes at a relatively high time resolution. Analyzing genomic data showed low strain variability in Gordonia and almost clonal conservation of the CRISPR loci. Phages co-evolved by introducing directional changes, with no preference for mutations within specific regions. The complexity at the population level had important consequences for bacteria-phage coexistence, with certain host populations not acquiring newer spacers to combat coexisting phages.
Article
Microbiology
Luciano A. Gabbarini, Eva Figuerola, Juan P. Frene, Natalia B. Robledo, Federico M. Ibarbalz, Doreen Babin, Kornelia Smalla, Leonardo Erijman, Luis G. Wall
Summary: This study revealed that enzymatic activities were higher in no-till soils compared to conventional tillage, with enzymatic profiles responding to changes earlier than the overall prokaryotic community structure. The beta diversity measurements of the prokaryotic community showed that the stratification levels observed in long-term no-till soils were recovered within 30 months of switching from conventional tillage to no-till. Bacteria and Archaea OTUs responding to no-till were associated with coarse soil fraction, soil organic carbon, and C cycle enzymes, while conventional tillage responders were related to fine soil fractions and S cycle enzymes.
FEMS MICROBIOLOGY ECOLOGY
(2021)
Article
Microbiology
Keren Hernandez Guijarro, Eduardo De Geronimo, Leonardo Erijman
Summary: This study investigates the potential of Bradyrhizobium genes in glyphosate degradation in soil, revealing that different genotypes may be associated with the degradation of glyphosate in different environmental conditions.
CURRENT MICROBIOLOGY
(2021)
Editorial Material
Microbiology
Leonardo Erijman, Stefano Campanaro, Claudia Etchebehere, Maria Bernadete Amancio Varesche
FRONTIERS IN MICROBIOLOGY
(2021)
Article
Agricultural Engineering
Esteban Orellana, Leandro D. Guerrero, Carol Davies-Sala, Melisa Altina, Rodrigo M. Pontiggia, Leonardo Erijman
Summary: This study used gene and genome-centric metagenomics to examine microbiome dynamics in anaerobic digesters. The results showed that changes in feedstock composition can establish new microbial niches for bacteria with the capacity to degrade newly added substrates. Food waste concentration correlated with extracellular enzymes and metagenome-assembled genomes (MAGs) involved in the degradation of complex carbohydrates commonly found in fruits and plant cell walls.
BIORESOURCE TECHNOLOGY
(2022)
Article
Biochemical Research Methods
Diana P. Wehrendt, Mariana G. Masso, Adrian Gonzales Machuca, Claudia V. Vargas, Melina E. Barrios, Josefina Campos, Damian Costamagna, Luis Bruzzone, Daniel M. Cisterna, Nestor Gabriel Iglesias, Viviana A. Mbayed, Elsa Baumeister, Daniela Centron, Maria Paula Quiroga, Leonardo Erijman
Summary: This study established a simple protocol for concentrating SARS-CoV-2 from sewage, which can boost detection sensitivity and is suitable for labs with minimal resources. The method is not only quick and straightforward, but also avoids the need for tedious sample handling steps, enhancing detection stability.
JOURNAL OF VIROLOGICAL METHODS
(2021)
Review
Biotechnology & Applied Microbiology
Maria Celina Zabaloy, Marco Allegrini, Keren Hernandez Guijarro, Filipe Behrends Kraemer, Hector Morras, Leonardo Erijman
Summary: This article summarizes the biodegradation of glyphosate in aquatic and soil ecosystems, focusing on the interplay between microbiomes and glyphosate degradation, as well as the impact of physical factors. It aims to fill the existing gap in understanding this relationship.
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Morten Simonsen Dueholm, Marta Nierychlo, Kasper Skytte Andersen, Vibeke Rudkjobing, Simon Knutsson, Mads Albertsen, Per Halkjaer Nielsen
Summary: Microbial communities play a crucial role in biological wastewater treatment. This study generates a comprehensive 16S rRNA gene reference database using high-quality sequences from wastewater treatment plants worldwide, providing insights into the diversity and function of these microbial communities. The analysis reveals the impact of environmental conditions and biogeography on the activated sludge microbiota.
NATURE COMMUNICATIONS
(2022)
Article
Plant Sciences
Anahi Coniglio, Giovanni Larama, Romina Molina, Veronica Mora, Daniela Torres, Anelis Marin, Andres Ignacio Avila, Coline Lede NoirCarlan, Leonardo Erijman, Eva Lucia Figuerola, Emanuel Maltempi de Souza, Fabricio Cassan
Summary: Azospirillum is a crucial plant growth promoting rhizobacteria used in global agriculture. This study reveals that Azospirillum inoculation can alter the microbial community structure in maize rhizosphere, resulting in an increase in the relative abundance of beneficial bacterial genera.
JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION
(2022)
Article
Soil Science
Juan P. Frene, Eva Figuerola, Luciano A. Gabbarini, Leonardo Erijman, Luis G. Wall
Summary: This on-farm study investigates the effects of no-till agricultural diversification and intensification of crop rotations (DICR) on soil biological properties. The results show that DICR can alter the composition of soil microbiota, which can contribute to the design of more sustainable agricultural systems.
APPLIED SOIL ECOLOGY
(2022)
Article
Agricultural Engineering
Alexandros Chatzis, Esteban Orellana, Maria Gaspari, Konstantinos Kontogiannopoulos, Laura Treu, Anastasios Zouboulis, Panagiotis G. Kougias
Summary: Packing materials play a significant role in improving the efficiency of biological methanation in Trickle Bed Reactors. This study evaluated the performance of pelletized activated carbon and Raschig rings as packing materials. Activated carbon outperformed Raschig rings by achieving higher methane purity, maintaining stable pH levels, and reducing gas retention time. The study also found that the digestate from biogas plants served as a sufficient nutrient source. The composition of the microbial community and the physical properties of packing materials contributed to maximizing the efficiency of biological methanation.
BIORESOURCE TECHNOLOGY
(2023)