A5011455628- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Air Quality and Health Impacts
- Atmospheric aerosols and clouds
- Microbial Natural Products and Biosynthesis
- Phytochemical compounds biological activities
- Air Quality Monitoring and Forecasting
- Various Chemistry Research Topics
- Science Education and Pedagogy
- Vehicle emissions and performance
- Aquatic Ecosystems and Phytoplankton Dynamics
- Soil erosion and sediment transport
- Fungal Biology and Applications
- Marine and coastal ecosystems
- Innovative Teaching and Learning Methods
- Environmental Policies and Emissions
- Indoor Air Quality and Microbial Exposure
University of Michigan
2020-2025
Institute for Literature
2025
University of California, Irvine
2025
University of North Carolina at Chapel Hill
2018
Harmful algal blooms (HABs) caused by cyanobacteria in freshwater environments produce toxins (e.g., microcystin) that are harmful to human and animal health. HAB frequency intensity increasing with greater nutrient runoff a warming climate. Lake spray aerosol (LSA) released from lakes has been identified on lakeshores after transport inland, including HABs, but little is known about the potential for be incorporated into LSA. In this study, samples were collected two Michigan: Mona during...
Aerosol acidity increases secondary organic aerosol (SOA) formed from the reactive uptake of isoprene-derived epoxydiols (IEPOX) by enhancing condensed-phase reactions within sulfate-containing submicron particles, leading to low-volatility products. However, link between initial and resulting physicochemical properties IEPOX-derived SOA remains uncertain. Herein, we show distinct differences in morphology, phase state, chemical composition individual organic–inorganic mixed particles after...
Isoprene has the highest atmospheric emissions of any nonmethane hydrocarbon, and isoprene epoxydiols (IEPOX) are well-established oxidation products primary contributors forming isoprene-derived secondary organic aerosol (SOA). Highly acidic particles (pH 0–3) widespread across lower troposphere enable acid-driven multiphase chemistry IEPOX, such as epoxide ring-opening reactions methyltetrol sulfates through nucleophilic attack sulfate (SO42–). Herein, we systematically demonstrate an...
The acidity of atmospheric aerosols is a critical property that affects the chemistry and composition atmosphere. Many key multiphase chemical reactions are pH-dependent, impacting processes like secondary organic aerosol formation, need to be understood at single particle level due differences in particle-to-particle impact both climate health. However, analytical challenge measuring individual particles has limited pH measurements for fine (<2.5 μm) coarse (2.5–10 particles. This led...
Dwellings across the United States range dramatically with respect to numerous variables (e.g., size, ventilation, and proximity outdoor sources), there are considerable uncertainties regarding heterogeneity in chemical...
At fixed aerosol acidity, we recently demonstrated that dimers in isoprene epoxydiol-derived secondary organic (IEPOX-SOA) can heterogeneously react with hydroxyl radical (·OH) at faster rates than monomers. Aerosol acidity influences this aging process by enhancing the formation of oligomers freshly generated IEPOX-SOA. Therefore, systematically examined role on kinetics and products resulting from heterogeneous ·OH oxidation IEPOX reacted inorganic sulfate varying initial pH (0.5, 1.5,...
As worldwide trends move toward replacing combustion transportation modes with electric vehicles, characterizing non-tailpipe emissions, such as those from brake wear, becomes increasingly important. Nitrous acid (HONO), nitryl chloride (ClNO2), and dinitrogen pentoxide (N2O5) are important sources of radical oxidants (e.g., •OH, •Cl, •NO3) nitrogen oxides (NOx) in the atmosphere, driving chemistry that leads to air quality degradation. Discrepancies between measurements model predictions...
Oxidation of isoprene, the biogenic volatile organic compound (BVOC) with highest emissions globally, is a large source secondary aerosol (SOA) in atmosphere. Particulate organosulfates formed from acid-driven reactions oxidation products isoprene epoxydiol (IEPOX) isomers are important contributors to SOA mass. Most studies have focused on organosulfate formation ammonium sulfate particles, often at low pH. However, recent work has shown that sea spray (SSA) accumulation mode (∼100 nm)...
Secondary organic aerosol (SOA) from acid-driven reactive uptake of isoprene epoxydiols (IEPOX) contributes up to 40% (OA) mass in fine particulate matter. Previous work showed that IEPOX substantially converts inorganic sulfates surface-active organosulfates (OSs). This decreases acidity and creates a viscous organic-rich shell poses as diffusion barrier, inhibiting additional IEPOX. To account for this "self-limiting" effect, we developed phase-separation box model evaluate...
Reading and understanding scientific literature is an essential skill for any scientist to learn. While students' literacy can be improved by reading research articles, article's technical language structure hinder of the material. Furthermore, many students struggle with interpreting graphs other models data commonly found in literature. To introduce promote graphs, we developed a guided-inquiry activity adapted from article on snow chemistry implemented it general laboratory course. Here,...
Fungal secondary metabolites represent a rich and largely untapped source for bioactive molecules, including peptides with substantial structural diversity pharmacological potential. As methods proceed to take deep dive into fungal genomes, complimentary identify components are required keep pace the expanding repertoire. We developed PepSAVI-MS expedite search natural product herein demonstrate proof-of-principle applicability of pipeline discovery from secretomes via identification...