A5047141968- Indoor Air Quality and Microbial Exposure
- Air Quality and Health Impacts
- Infection Control and Ventilation
- Air Quality Monitoring and Forecasting
- Aerosol Filtration and Electrostatic Precipitation
- Odor and Emission Control Technologies
- Particle Dynamics in Fluid Flows
- Inhalation and Respiratory Drug Delivery
- Vehicle emissions and performance
- Atmospheric chemistry and aerosols
- Noise Effects and Management
- Combustion and Detonation Processes
- Bacillus and Francisella bacterial research
- Allergic Rhinitis and Sensitization
- Burn Injury Management and Outcomes
- Cyclone Separators and Fluid Dynamics
- COVID-19 and healthcare impacts
- Occupational exposure and asthma
- Energetic Materials and Combustion
- Wind and Air Flow Studies
- Asthma and respiratory diseases
- Dental Research and COVID-19
- Microbial Community Ecology and Physiology
- Advanced Chemical Sensor Technologies
- Plant Pathogens and Fungal Diseases
University of Cincinnati Medical Center
2006-2025
University of Cincinnati
2015-2024
Kazan Federal University
2016
Environmental Health
2005-2015
New Jersey Institute of Technology
2015
Odesa I. I. Mechnikov National University
1990-2008
Cincinnati Health Department
2005
Rutgers, The State University of New Jersey
2005
Defence Science and Technology Laboratory
2005
The aerosolization process of fungal propagules three species (Aspergillus versicolor, Penicillium melinii, and Cladosporium cladosporioides) was studied by using a newly designed constructed chamber. We discovered that fragments are aerosolized simultaneously with spores from contaminated agar ceiling tile surfaces. Concentration measurements an optical particle counter showed the released in higher numbers (up to 320 times) than spores. release varied depending on species, air velocity...
The protection level offered by filtering facepiece particulate respirators and face masks is defined the percentage of ambient particles penetrating inside device. There are two penetration pathways: (1) through faceseal leakage, (2) filter medium. This study aimed at differentiating contributions these pathways for in size range 0.03-1 microm under actual breathing conditions. One N95 respirator one surgical mask commonly used health care environments were tested on 25 subjects (matching...
Abstract Coronavirus disease 2019 (COVID-19) patients exhaled millions of severe acute respiratory syndrome coronavirus 2 RNA copies per hour, which plays an important role in COVID-19 transmission. Exhaled breath had a higher positive rate (26.9%, n = 52) than surface (5.4%, 242) and air (3.8%, 26) samples.
In 1995 the National Institute for Occupational Safety and Health issued new regulations nonpowered particulate respirators (42 CFR Part 84). A filter certification system also was created. Among that have entered market, N95 respirator is most commonly used in industrial health care environments. The filtration efficiencies of unloaded been compared with those dust/mist (DM) dust/fume/mist (DFM) certified under former (30 11). Through laboratory tests NaCl aerosols measurements...
ABSTRACT A new principle for collecting airborne particles, including microorganisms, has been introduced by injecting the particles into a swirling airflow from where they are removed onto collection surface. dry surface, surface coated with an adhesive substance or wetted liquid swirled reservoir below can be used in method. The air motion and aerosol injection it achieved drawing through nozzles that directed at angle toward This incorporated sampler named "Swirling Aerosol Collector"...
Abstract Objectives: This study aimed at determining the protection factors (PFs) provided by N95 filtering facepiece respirators and surgical masks against particles representing bacterial viral size ranges (aerodynamic size: 0.04–1.3 μm). Methods: The levels of (four models) (three were investigated while they donned 12 subjects performing OSHA (US Occupational Safety Health Administration) fit-testing exercises in a test chamber. Results: About 29% ∼100% had PFs <10, which is...
Protection of the human respiratory system from exposure to nanoparticles is becoming an emerging issue in occupational hygiene. The potential adverse health effects associated with particles approximately 1-100 nm are probably greater than submicron or micron-sized particles. performance two models N95 half-facepiece-filtering respirators against nano-sized was evaluated at inhalation flow rates, 30 and 85 l min(-1), following a manikin-based protocol. aerosol concentration measured outside...
Microbial stress due to the impaction of microorganisms onto an agar collection surface was studied experimentally. The relative recovery rates aerosolized Pseudomonas fluorescens and Micrococcus luteus were determined as a function velocity by using moving slide impactor operating over flow rate range from 3.8 40 liters/min yielding velocities 24 250 m/s. As reference, sixth stage Andersen Six-Stage Viable Particle Sizing Sampler used at its 28.3 (24 m/s). At efficiency close 100% for...
Bacterial agents and cell components can be spread as bioaerosols, producing infections asthmatic problems. This study compares four methods for the detection enumeration of aerosolized bacteria collected in an AGI-30 impinger. Changes total viable concentrations Pseudomonas fluorescens collection fluid with respect to time impingement were determined. Two direct microscopic (acridine orange BacLight) aerodynamic aerosol-size spectrometry (Aerosizer) employed measure bacterial impinger air,...
Airborne dust and microorganisms are associated with respiratory diseases increased mortality morbidity. Farmers at high risk of exposure to both these hazards. Very limited information, however, is available on the combined exposures hazards different types farms. Moreover, most previous studies have measured mass concentration particles ignoring particle size. In this study, farmers' airborne was studied using our newly developed personal sampling system. Particle number size distribution...
BackgroundWe previously reported an association between infant wheezing and residence < 100 m from stop-and-go bus truck traffic. The use of a proximity model, however, may lead to exposure misclassification.ObjectiveResults obtained land regression (LUR) model traffic are compared with those model. estimates derived the LUR were then related wheezing.MethodsWe marker diesel combustion—elemental carbon attributable sources (ECAT)—from ambient monitoring results particulate matter aerodynamic...
Abstract The performance of three filtering facepiece respirators (two models N99 and one N95) challenged with an inert aerosol (NaCl) virus aerosols (enterobacteriophages MS2 T4 Bacillus subtilis phage)—all significant ultrafine components—was examined using a manikin-based protocol sealed on manikins. Three inhalation flow rates, 30, 85, 150 l min−1, were tested. filter penetration the quality factor determined. Between-respirator within-respirator comparisons values performed. At most...
The purpose of this study was to determine the physical collection efficiency commercially available filters for collecting airborne bacteria, viruses, and other particles in 10–900 nm (nanometer) size range. Laboratory experiments with various polytetrafluoroethylene (PTFE), polycarbonate (PC) gelatin conjunction Button™ Inhalable samplers three-piece cassettes were undertaken. Both biological non-biological test aerosols used: Bacillus atrophaeus, MS2, polystyrene latex (PSL), sodium...
There is increasing concern about the potential effects of traffic-related air pollution (TRAP) on developing brain. The impact TRAP exposure childhood behavior not fully understood because limited epidemiologic studies.We explored association between early-life to using a surrogate, elemental carbon attributed traffic (ECAT), and attention deficit/hyperactivity disorder (ADHD) symptoms at 7 years age.From Cincinnati Childhood Allergy Air Pollution Study (CCAAPS) birth cohort we collected...
ABSTRACT In this study, airborne MS2 bacteriophages were exposed for subsecond time intervals to atmospheric-pressure cold plasma (APCP) produced using different power levels (20, 24, and 28 W) gas carriers (ambient air, Ar-O 2 [2%, vol/vol], He-O vol/vol]). addition, waterborne viruses directly subjected the APCP treatment up 3 min. with without exposure examined by scanning electron microscopy (SEM), reverse transcription-PCR (RT-PCR), sodium dodecyl sulfate-polyacrylamide gel...
The timing and duration of traffic-related air pollution (TRAP) exposure may be important for childhood wheezing asthma development.We examined the relationship between TRAP longitudinal phenotypes at age 7 years.Children completed clinical examinations annually from 1 year through 4 years years. Parental-reported was assessed each age, (early-transient, late-onset, persistent) were defined Participants' time-weighted to TRAP, birth years, estimated using a land-use regression model....
BackgroundAn exceptionally high demand for surgical masks and N95 filtering facepiece respirators (FFRs) during the COVID-19 pandemic has considerably exceeded their supply. These disposable devices are generally not approved routine decontamination re-use as a standard of care, while this practice widely occurred in hospitals. The US Centers Disease Control Prevention allowed it "as crisis capacity strategy". However, limited testing was conducted on impact specific methods performance FFRs...
The COVID-19 pandemic has incredibly escalated the use of petroleum-based disposable facemasks, posing a significant environmental burden. In response, polylactide acid (PLA), biobased and biodegradable aliphatic polymer, been considered potential alternative. However, applications PLA in facemask materials are hindered by its inherent brittleness, poor toughness, slow degradation rate environment. Addressing these challenges, this study explored two triesters as green plasticizers to...