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
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.
Review
Microbiology
Jeronimo Rodriguez-Beltran, Javier DelaFuente, Ricardo Leon-Sampedro, R. Craig MacLean, Alvaro San Millan
Summary: Plasmids play a vital role in bacterial ecology and evolution by mobilizing accessory genes through horizontal gene transfer. Recent studies show that plasmids, kept at multiple copies per cell, create islands of polyploidy in bacterial genomes, leading to evolution governed by different rules than those affecting chromosomal genes. Plasmids may accelerate bacterial evolution by promoting the evolution of plasmid-encoded genes and enhancing the adaptation of their host chromosomes.
NATURE REVIEWS MICROBIOLOGY
(2021)
Article
Environmental Sciences
Nirali M. M. Raiyani, Satya P. P. Singh
Summary: In this investigation, a comprehensive and comparative analysis of bacterial communities and their functional potential in pristine and polluted marine sediments was conducted using MiSeq. Proteobacteria was the dominant phylum in all study sites, with other phyla including Actinobacteria, Bacteroidetes, Planctomycetes, Acidobacteria, Chloroflexi, Nitrospirae, Cyanobacteria, Verrucomicrobia, Tenericutes, and Chlorobi. The key genera identified were Acinetobacter, Bacillus, Pseudomona, Idiomarina, Thalassospira, Marinobacter, Halomonas, Planctomyces, Psychrobacter, and Vogesella. Major functions associated with metabolism, including amino acids, carbohydrates, energy generation, xenobiotics degradation, nitrogen, sulfate, and methane, were observed. This study significantly adds to our understanding of the microbiome and its functional attributes of marine sediments.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Ecology
Xiyang Dong, Haoyu Lan, Liangtian Huang, Haikun Zhang, Xianbiao Lin, Shengze Weng, Yongyi Peng, Jia Lin, Jiang-hai Wang, Juan Peng, Ying Yang
Summary: This study assessed the microbial communities in surface sediments from 16 coral reef sites at different depths in the Xisha islands using gene- and genome-centric metagenomics. The results revealed the diversity and functional potential of the microbial communities, as well as the presence of antibiotic resistance genes. These findings contribute to a better understanding of the microbial ecology in reef sediments.
Article
Engineering, Environmental
Qiang Lin, Jo De Vrieze, Xiaoyu Fang, Lingjuan Li, Xiangzhen Li
Summary: This study investigated the relationship between microbial life strategy and energy and nutrient flux in anaerobic digestion (AD). The results showed that there was a positive correlation between microbial rrn copy number and CH4 daily production, and this correlation was weakened when feedstock complexity was reduced. Furthermore, the mean rrn expression ratio of microbial communities also exhibited similar patterns. The findings reveal a novel relationship between microbial community life strategy and the energy and nutrient flux during AD.
Article
Environmental Sciences
Amanda Pacholak, Agnieszka Zgola-Grzeskowiak, Ewa Kaczorek
Summary: The purpose of this research was to investigate the biodegradation of nitrofurantoin (NFT), a potential carcinogenic nitrofuran antibiotic, by two microbial communities from different environmental niches. The study found that NFT significantly altered the community structure and increased biodiversity in the aquatic systems. The research also discovered new transformation products of NFT.
ENVIRONMENTAL RESEARCH
(2023)
Article
Microbiology
Aide Lasa, Manon Auguste, Alberto Lema, Caterina Oliveri, Alessio Borello, Elisa Taviani, Guido Bonello, Lapo Doni, Andrew D. Millard, Maxime Bruto, Jesus L. Romalde, Michail Yakimov, Teresa Balbi, Carla Pruzzo, Laura Canesi, Luigi Vezzulli
Summary: Evolution of virulence traits in marine microbial pathogens may arise from adaptation to environmental niches beyond the host, which could be crucial for understanding their emergence and pathogenic potential. A newly discovered marine bacterial species, Vibrio bathopelagicus sp. nov., isolated from the deep Mediterranean Sea waters, exhibits genotypic and phenotypic traits associated with animal pathogenicity. This planktonic marine bacterium may have played an evolutionary role in the origin of coastal marine pathogens.
ENVIRONMENTAL MICROBIOLOGY
(2021)
Article
Environmental Sciences
Ruijie Zhang, Xuming Xu, Dantong Jia, Yitao Lyu, Jingrun Hu, Qian Chen, Weiling Sun
Summary: This study found that antibiotics inhibit denitrification, but sediments help alleviate this inhibition and promote bacterial growth. Sediments have negative effects on antibiotic resistance genes but positive effects on bacterial quantity and denitrification functional genes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Yongshan Chen, Yue Lu, Jinghua Xu, Ying Feng, Xiaofeng Li
Summary: This study found that multiple residual antibiotics in coastal areas could cause fundamental shifts in microbial community and their associated antibiotic resistance genes.
MARINE POLLUTION BULLETIN
(2023)
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
Microbiology
Adelaide Roguet, Ryan J. Newton, A. Murat Eren, Sandra L. McLellan
Summary: The microbial communities in sewer pipes show high coherence and are influenced by temperature. The sewer environment contains abundant resident organisms that carry clinically important antibiotic resistant genes. Understanding the complex ecology of sewer infrastructure is crucial for improving waste treatment and monitoring human populations.
Article
Biotechnology & Applied Microbiology
Zhengxin Ma, Shinyoung Lee, Peixin Fan, Yuting Zhai, Jaehyun Lim, Klibs N. Galvao, Corwin Nelson, Kwangcheol Casey Jeong
Summary: The study identified cephalosporin-resistant bacteria in milk samples from two dairy farms, but no strong relationship was observed between treatment failure rate and CRB prevalence. Metagenomic analysis showed no significant differences in microbiota diversities between cured and uncured cows, suggesting antibiotic-resistant bacteria were not the sole reason for antibiotic treatment failure.
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
(2021)
Article
Agricultural Engineering
Sainan Chen, Weizhang Zhong, Zhifang Ning, Jianrui Niu, Jing Feng, Xue Qin, Zaixing Li
Summary: This study aimed to address the problems of diagnosing terramycin mycelial dreg (TMD) and removing terramycin and antibiotic resistance genes (ARGs). Aerobic composting (AC) technology was used along with homemade compound microbial inoculum (HCMI). The results showed that terramycin residues became harmless after AC. HCMI reduced QacB and tetH and increased the degradation rates of VanRA, VanT, and dfrA24. The HCMI also improved the removal rate of ARG subtypes to a certain extent. The succession of the microbial community during AC had a stronger influence on the variance of ARG subtypes than the environmental conditions, possibly due to changes in temperature affecting the abundance of various bacteria.
BIORESOURCE TECHNOLOGY
(2023)
Article
Microbiology
Bo Kuang, Rong Xiao, Yanping Hu, Yaping Wang, Ling Zhang, Zhuoqun Wei, Junhong Bai, Kegang Zhang, Jacquelinne J. Acuna, Milko A. Jorquera, Wenbin Pan
Summary: The abundance, diversity, and metabolic pathways of microbial communities in Baiyangdian lake sediments were studied using a metagenomic approach. It was found that several genera, particularly belonging to Proteobacteria and Actinobacteria, were involved in C, N, P, and S cycling processes. Nocardioides, in particular, played a significant role in nitrogen transformation processes such as assimilatory nitrate reduction, denitrification, and dissimilatory nitrate reduction.
FRONTIERS IN MICROBIOLOGY
(2023)
