Exploring Bacterial Resilience to Uranium Contamination: Species Identification and Characterization

Аннотация

Uranium contamination in soil poses significant environmental and ecological risks, affecting microbial communities and their functions. This study explores the resilience of bacterial species in uranium-contaminated environments by identifying and characterizing affected microbial populations. Soil samples from uranium- impacted sites were analyzed using culture-dependent and molecular techniques to assess bacterial diversity, resistance mechanisms, and potential bioremediation capabilities. The results indicate the presence of uranium- tolerant bacteria, including species with metal-resistant genes and bioaccumulation properties. Understanding these adaptive mechanisms provides insights into microbial responses to heavy metal stress and informs bioremediation strategies for uranium-contaminated ecosystems. Keywords: Uranium contamination, bacterial resilience, soil microbiota, heavy metal stress, bioremediation, microbial adaptation, uranium-tolerant bacteria, environmental microbiology, bacterial diversity, metal-resistant genes. species and characterizing their physiological and Introduction: Uranium contamination in soil is a genetic adaptations. By employing culture-dependent significant environmental concern, primarily resulting and molecular techniques, we investigate microbial from mining activities, nuclear energy production, and diversity, uranium resistance mechanisms, and the role improper disposal of radioactive waste. The presence of these bacteria in natural attenuation processes. The of uranium in soil disrupts microbial communities, findings of this study will contribute to the alters ecosystem functions, and poses risks to human development of bioremediation approaches for health and biodiversity. Due to its toxicity and uranium-contaminated environments, enhancing our radioactive nature, uranium contamination demands understanding of microbial interactions with effective remediation strategies to minimize radioactive pollutants. environmental damage. METHODS Microorganisms, particularly bacteria, play a crucial role in mitigating heavy metal contamination through Study Site and Soil Sample Collection various resistance and detoxification mechanisms. Soil samples were collected from uranium- These include bioaccumulation, biotransformation, contaminated sites with a history of industrial or and biomineralization, which enable certain bacterial mining activity. Sampling locations were selected based species to survive and adapt in uranium-contaminated on prior reports of uranium presence, with varying environments. Identifying and characterizing these levels of contamination assessed using preliminary resilient bacterial species is essential for understanding radiation and heavy metal screening. Control samples their adaptive strategies and potential applications in were taken from non-contaminated sites in proximity bioremediation. to the affected areas to compare microbial diversity This study aims to explore bacterial resilience in and resilience mechanisms. At each site, soil samples uranium-contaminated soil by identifying affected were collected from the top 10–15 cm layer using American Journal Of Biomedical Science & Pharmaceutical Innovation 1 https://theusajournals.com/index.php/ajbspi American Journal of Applied Science and Technology (ISSN: 2771-2745) sterile tools and stored in sterile polyethylene bags. uranium-resistant bacteria. GPS coordinates and physicochemical parameters, such as pH, temperature, and moisture content, were Characterization of Uranium Resistance Mechanisms recorded for each sampling location. All samples were transported to the laboratory on ice and processed To explore bacterial strategies for uranium tolerance, within 24 hours to minimize microbial alterations. selected isolates were subjected to biochemical and molecular assays. Enzyme activity related to uranium bioreduction, such as phosphatase and oxidoreductase Soil Physicochemical Analysis activities, was assessed using colorimetric assays. To assess the environmental conditions influencing Bioaccumulation potential was evaluated by exposing bacterial communities, soil physicochemical properties bacterial cultures to uranium-containing media and were analyzed. Soil pH was determined using a digital quantifying intracellular uranium using energy- pH meter in a 1:2.5 soil-to-water suspension. Moisture dispersive X-ray spectroscopy (EDS). Additionally, the content was measured by drying samples at 105°C for presence of metal resistance genes, including uranyl 24 hours, and organic matter content was estimated reductase (urA) and efflux pump-related genes, was using the loss-on-ignition method. Total uranium investigated using PCR-based screening. Gene concentration was quantified using inductively coupled expression analysis was conducted using quantitative plasma mass spectrometry (ICP-MS) after acid PCR (qPCR) to determine transcriptional responses digestion of soil samples with a mixture of nitri