AI Article Synopsis
- Microorganisms adapt to environmental stress, but their response to long-term heavy metal contamination in natural conditions is not well understood; this study focused on the Mang River, heavily polluted for over 40 years.
- The sediment samples showed high concentrations of metals like Cr, Zn, and Pb, with two-thirds at or above moderate ecological risk levels, indicating significant impact on the microbial community and its resistance genes.
- The research revealed that a heavy metal-resistant microbiome likely developed through the spread of insertion sequences (ISs) carrying multiple metal resistance genes (MRGs), suggesting ISs play a key role in microbial adaptation to heavy metal stress.
Article Abstract
Microorganisms have developed mechanisms to adapt to environmental stress, but how microbial communities adapt to long-term and combined heavy-metal contamination under natural environmental conditions remains unclear. Specifically, this study analyzed the characteristics of heavy metal composition, microbial community, and heavy metal resistance genes (MRGs) in sediments along Mang River, a tributary of the Yellow River, which has been heavily polluted by industrial production for more than 40 years. The results showed that the concentrations of Cr, Zn, Pb, Cu and As in most sediments were higher than the ambient background values. Bringing the heavy metals speciation and concentration into the risk evaluation method, two-thirds of the sediment samples were at or above the moderate risk level, and the ecological risk of combined heavy metals in the sediments decreased along the river stream. The high ecological risk of heavy metals affected the microbial community structure, metabolic pathways and MRG distribution. The formation of a HM-resistant microbiome possibly occurred through the spread of insertion sequences (ISs) carrying multiple MRGs, the types of ISs carrying MRGs outnumber those of plasmids, and the quantity of MRGs on ISs is also higher than that on plasmids. These findings could improve our understanding of the adaptation mechanism of microbial communities to long-term combined heavy metal contamination.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.envres.2024.118861 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Marine and atmospheric transport modeling supporting nuclear preparedness in Norway: Recent achievements and remaining challenges.
Sci Total Environ
January 2025
Center for Environmental Radioactivity (CERAD) CoE, Norwegian University of Life Sciences, P.O. Box 5003, N-1432 Ås, Norway; Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences (NMBU), P.O.Box 5003, NO-1432 Ås, Norway.
Numerical transport models are important tools for nuclear emergency decision makers in that they rapidly provide early predictions of dispersion of released radionuclides, which is key information to determine adequate emergency protective measures. They can also help us understand and describe environmental processes and can give a comprehensive assessment of transport and transfer of radionuclides in the environment. Transport of radionuclides in air and ocean is affected by a number of different physico-chemical processes.
View Article and Find Full Text PDFOptimal CPAP Weaning Approaches: A Scoping Review.
J Perinat Neonatal Nurs
October 2024
Author Affiliations:Duke University School of Nursing, Durham (Ms Adeku, Mrs Defore, Dr Newberry, and Ms Yates); University of North Carolina Neonatology, Chapel Hill (Dr Newberry); and Duke University Neonatology, Durham, North Carolina (Ms Yates).
Background: Bronchopulmonary dysplasia (BPD) is a prevalent chronic lung disease affecting premature infants, leading to long-term respiratory complications, hospital readmissions, and significant financial burden on families and the health care system. BPD is caused by lung injury, making it crucial to focus on methods to minimize lung injury and prevent the transition from respiratory distress syndrome to BPD by following evidence-based respiratory support strategies.
Purpose: This scoping review examines methods for weaning preterm infants off continuous positive airway pressure (CPAP) and evaluates their effectiveness in maintaining respiratory independence.
Assessing indirect biodiversity conservation benefits of fisheries closures in the Gulf of St. Lawrence, Canada.
PLoS One
January 2025
Centre for Fisheries Ecosystems Research, Fisheries and Marine Institute of Memorial University, St John's, Newfoundland and Labrador, Canada.
Marine biodiversity loss is a pressing global issue, intensified by human activities and climate change. Complementary to marine protected areas (MPAs), Other Effective Area-Based Conservation Measures (OECMs) have emerged as a key tool to mitigate this loss by providing long-term biodiversity protection. However, while OECMs primarily target specific taxa, they can also offer indirect biodiversity conservation benefits (BCBs) to a wider range of taxa.
View Article and Find Full Text PDFIntraoperative transcutaneous electrical acupoint stimulation combined with anesthesia to prevent postoperative cognitive dysfunction: A systematic review and meta-analysis.
PLoS One
January 2025
The Third Clinical Medical College, Zhejiang Chinese Medical University, Key Laboratory of Acupuncture and Neurology of Zhejiang Province, Hangzhou, China.
Background: Postoperative cognitive dysfunction (POCD) is associated with an increased risk of dementia and may lead to chronic neurodegeneration. The utilization of intraoperative Transcutaneous Electrical Acupoint Stimulation (TEAS) in conjunction with anesthesia is expected to become an effective preventive measure for POCD in clinical practice.
Methods: We conducted a comprehensive literature review focusing on the use of TEAS in the prevention of POCD during surgical anesthesia.
The Screening Tomosynthesis Trial with Advanced Reader Methods (STREAM): design and rationale of a population-based breast cancer screening trial.
Eur Radiol
January 2025
Radboud University Medical Center, IQ Health science department, Nijmegen, The Netherlands.
Objectives: It is uncertain what the effects of introducing digital breast tomosynthesis (DBT) in the Dutch breast cancer screening programme would be on detection, recall, and interval cancers (ICs), while reading times are expected to increase. Therefore, an investigation into the efficiency and cost-effectiveness of DBT screening while optimising reading is required.
Materials And Methods: The Screening Tomosynthesis trial with advanced REAding Methods (STREAM) aims to include 17,275 women (age 50-72 years) eligible for breast cancer screening in the Netherlands for two biennial DBT screening rounds to determine the short-, medium-, and long-term effects and acceptability of DBT screening and identify an optimised strategy for reading DBT.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!