A5068070793- Nanoparticles: synthesis and applications
- Environmental Toxicology and Ecotoxicology
- Geochemistry and Elemental Analysis
- Heavy metals in environment
- Microplastics and Plastic Pollution
- Mercury impact and mitigation studies
- Physiological and biochemical adaptations
- Aquaculture Nutrition and Growth
- Graphene and Nanomaterials Applications
- Genetics, Aging, and Longevity in Model Organisms
- Aquaculture disease management and microbiota
- Toxic Organic Pollutants Impact
- Healthcare and Environmental Waste Management
- Electrochemical Analysis and Applications
- Effects and risks of endocrine disrupting chemicals
- Advanced Nanomaterials in Catalysis
- Air Quality Monitoring and Forecasting
- Bat Biology and Ecology Studies
- Advanced battery technologies research
- Carcinogens and Genotoxicity Assessment
- Algal biology and biofuel production
- Magnetic and Electromagnetic Effects
- Marine Bivalve and Aquaculture Studies
- Extraction and Separation Processes
- DNA Repair Mechanisms
United States Food and Drug Administration
2021-2023
Material Measurement Laboratory
2015-2021
National Institute of Standards and Technology
2015-2021
Office of Science
2021
University of California, Santa Barbara
2009-2017
State Key Laboratory of Pollution Control and Resource Reuse
2017
Tongji University
2017
National Institute of Standards
2016
University of Arkansas at Pine Bluff
2008
Information on the toxicity of environmentally relevant concentrations nanoparticles in marine ecosystems is needed for informed regulation these emerging materials. We tested effects two types metal oxide nanoparticles, TiO2 and ZnO, population growth rates four species phytoplankton representing three major coastal groups (diatoms, chlorophytes, prymnesiophytes). These (NPs) are becoming common components many industrial, household, cosmetic products that released into ecosystems. Titania...
The increased use and incorporation of engineered nanoparticles (ENPs) in consumer products requires a robust assessment their potential environmental implications. However, lack standardized methods for nanotoxicity testing has yielded results that are sometimes contradictory. Standard ecotoxicity assays may work appropriately some ENPs with minimal modification but produce artifactual others. Therefore, understanding the robustness range is critical. In this study, we evaluated performance...
The increased use of engineered nanoparticles (ENPs) in consumer products raises the concern environmental release and subsequent impacts natural communities. We tested for physiological demographic ZnO, a prevalent metal oxide ENP, on mussel Mytilus galloprovincialis. exposed mussels two size classes, <4.5 ≥ 4.5 cm shell length, to 0.1-2 mg l(-1) ZnO ENPs seawater 12 wk, measured effect respiration, accumulation Zn, growth, survival. After wk exposure ENPs, respiration rates with...
Strategies are provided for making robust measurements of engineered nanomaterial bioaccumulation across a broad range organisms.
Bivalves are hypothesized to be key organisms in the fate and transport of engineered nanomaterials (ENMs) aquatic environments due their ability filter concentrate particles from water, but how different exposure pathways influence interactions with ENMs is not well understood. In a five-week experiment, we tested between CeO2 marine mussel, Mytilus galloprovincialis, affected through two methods, direct sorption phytoplankton. We found that phytoplankton sorbed <1 h. The methods used did...
Increasing production and use of engineered nanomaterials (ENMs) has generated widespread interest in measuring their environmental human health effects.
Abstract The nematode Caenorhabditis elegans is used extensively in molecular, toxicological and genetics research. However, standardized methods for counting nematodes liquid culture do not exist despite the wide use of need accurate measurements. Herein, we provide a simple affordable protocol developed to maximize count accuracy minimize variability culture. Sources process were identified tested 14 separate experiments. Three variables resulted significant effects on count: shaking...
Toxic pollutants leaching from littered cigarette butts (CB) raise environmental impact concerns. The US Food and Drug Administration (FDA) is required to assess the impacts of its tobacco regulatory actions per National Environmental Policy Act (NEPA).We determined chemical constituents in CB leachate through analyses 109 field-collected literature compilation characterized their ecotoxicity aquatic organisms.One-third 98 identified chemicals were very toxic 10% organisms due acute chronic...
Cu is an essential trace element but can be highly toxic to aquatic organisms at elevated concentrations. Greater use of CuO engineered nanoparticles (ENPs) may lead increased concentrations ENPs in environments causing potential ecological injury. We examined the toxicity marine mussels and influence on fate transport ENPs. exposed 1, 2, or 3 mg L−1 for four weeks, measured clearance rate, rejection, excretion accumulation Cu, mussel shell growth. Mussel rate was 48% less, growth 68% than...
For environmental studies assessing uptake of orally ingested engineered nanoparticles (ENPs), a key step in ensuring accurate quantification ENPs is efficient separation the organism from that are either nonspecifically adsorbed to and/or suspended dispersion following exposure. Here, we measure 30 and 60 nm gold (AuNPs) by nematode, Caenorhabditis elegans, using sucrose density gradient centrifugation protocol remove noningested AuNPs. Both conventional inductively coupled plasma mass...
Potential effects of metal nanoparticles on aquatic organisms and food webs are hard to predict from the results single-species tests under controlled laboratory conditions, more realistic exposure experiments rarely conducted. We tested whether silver (Ag NPs) had an impact zooplankton grazing their prey, specifically phytoplankton bacterioplankton populations. If Ag NPs directly reduced abundance thereby causing overall rate by predators decrease, a cascading effect planktonic estuarine...
Critical swimming speed ( U crit ) and rate of oxygen consumption Pacific cod Gadus macrocephalus acclimated to 4 11° C were determined assess the influence water temperature on performance. The physiological effect exercise trials fish held at two temperatures was also assessed by comparing haematocrit plasma concentrations cortisol, metabolites ions collected from before after testing. exercised 4° did not differ those [1·07 body lengths (total length) s −1 ]. While standard metabolic 28%...
Background/Methods Increased use and sales of e-cigarettes raises concerns about the potential environmental impacts throughout their life-cycle. However, few available research studies focus on ecotoxicity e-cigarettes. In this study, we short-list e-liquid chemicals from published literature that should be considered in future impact risk assessments. We used a combination laboratory bioassays-based data predictive methods (eg, Structure-Activity Relationships) to characterise hazards...
is used extensively as a medical and toxicological model organism. However, little known about background levels of oxidatively induced DNA damage in the nematode or how culturing methods affect levels. The tough