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Environ Pollut
Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, IA 50011, USA. Electronic address:
Published: March 2025
The global annual plastic production rate is approaching 400 million metric tons, with substantial amounts invading aquatic environments yearly. Numerous studies have been conducted monitoring marine plastic litter. An understanding of plastic litter's magnitude in freshwater ecosystems is lagging, particularly for microplastics (MP(s) 100 nm to 5 mm in length/diameter). Their ubiquitous presence and small sizes are concerning since MP effects remain inadequately understood. Our objective was to identify MP, measure concentration in lake surface waters and investigate how abiotic, biotic, and anthropogenic elements explain MP concentration variability among lakes. We sampled MPs in 132 Iowa lakes, collected throughout the water column using a Wisconsin net (53 μm mesh size). A fully automated custom-built Bruker LUMOS-II Fourier-transform infrared (FTIR) spectro-microscope was employed to identify MPs. Average MP concentration across all lakes was 5 particles/L, with dimensions averaging 145 μm in length and 80 μm in width. Predominant MP polymers collected were polyvinyl chloride (46% of all MPs), polyester (30%), and polyethylene (11%). Two variance partitioning analysis models were created to explore variability in MP concentration. The first classical model explained 7.5% of data variability based on roads, developed medium and high-intensity land cover, sewage plants, and thermocline. The second model, built according to Louvain Groups, explained 8.3% of data variability based on lake area, maximum lake depth, zooplankton tow depth, Secchi depth, lake perimeter, lake shoreline development factor, evergreen forest cover, and thermocline. Roads and developed intensity cover were positively correlated with MP concentrations, alongside household visits standardized to the lake area. Maximum lake depth, zooplankton tow depth, and Secchi depth were negatively correlated with MP concentration. MP concentration was significantly lower if the thermocline was present at the time of sample collection. In seven lakes, MP concentrations exceeded half-value of the modeled hazardous concentration, affecting 5% of aquatic species.
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http://dx.doi.org/10.1016/j.envpol.2025.125839 | DOI Listing |
Sci Rep
March 2025
Department of Biomedical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA, USA.
Organophosphate (OP) nerve agents, such as soman (GD), pose great risk to neurological health by inhibiting acetylcholinesterase, leading to seizures, epilepsy, and behavioral deficits. While acute treatment may alleviate immediate symptoms, the long-term consequences, particularly those involving neuroinflammation and systemic toxicity, remain poorly understood. This study used adult male and female Sprague Dawley rats to investigate the chronic effects of a single acute exposure to soman (132 µg/kg, s.
View Article and Find Full Text PDFJ Gen Intern Med
March 2025
Department of Medical Informatics & Clinical Epidemiology, Oregon Health & Science University, Portland, OR, USA.
Background: Multimorbidity with diabetes mellitus (DM and ≥ 1 chronic disease) presents challenges to maintaining adequate DM control.
Objective: This study evaluates the risk of DM-related complications associated with various multimorbidity/DM patterns for patients seen in community-based health centers (CHCs).
Design: Retrospective cohort study from the ADVANCE multi-state practice-based clinical data network.
J Expo Sci Environ Epidemiol
March 2025
Department of Environmental Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
Background: Childhood lead [Pb] exposure has been consistently linked to neurotoxic effects related to the prefrontal cortex, a critical mediating structure involved in decision-making, planning, problem-solving, and specific aspects of short-term memory, i.e., the components of executive functions [EFs].
View Article and Find Full Text PDFHealthcare (Basel)
February 2025
School of Kinesiology and Nutrition, University of Southern Mississippi, Hattiesburg, MS 39406, USA.
: This study assessed the association among perceived stress, anxiety, and depression with both the metabolic syndrome (MetS) risk and diagnostic status among young adults in the Deep South. : Participants included 132 young adults aged 18-39 (M = 27.73, SD = 11.
View Article and Find Full Text PDFEnviron Pollut
March 2025
Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, IA 50011, USA. Electronic address:
The global annual plastic production rate is approaching 400 million metric tons, with substantial amounts invading aquatic environments yearly. Numerous studies have been conducted monitoring marine plastic litter. An understanding of plastic litter's magnitude in freshwater ecosystems is lagging, particularly for microplastics (MP(s) 100 nm to 5 mm in length/diameter).
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