A5047874635- Aerosol Filtration and Electrostatic Precipitation
- Inhalation and Respiratory Drug Delivery
- Air Quality and Health Impacts
- Chemical Safety and Risk Management
- Air Quality Monitoring and Forecasting
- Radioactivity and Radon Measurements
- Carcinogens and Genotoxicity Assessment
- Particle Dynamics in Fluid Flows
- Noise Effects and Management
- Glutathione Transferases and Polymorphisms
- Nuclear and radioactivity studies
- Indoor Air Quality and Microbial Exposure
- Occupational exposure and asthma
- Pharmacogenetics and Drug Metabolism
- Risk and Safety Analysis
- Atmospheric chemistry and aerosols
- Crystal structures of chemical compounds
- Heavy Metal Exposure and Toxicity
- Occupational and environmental lung diseases
- Radioactive Decay and Measurement Techniques
- Chemistry and Chemical Engineering
- Recycling and Waste Management Techniques
- Airway Management and Intubation Techniques
- Inorganic Fluorides and Related Compounds
- Lightning and Electromagnetic Phenomena
University of Southern California
2019
NYU Langone Health
2013
New York University
2002-2011
Hôpital américain de paris
2011
University of Minnesota
1992-2011
RTI International
2011
Lubrizol Life Science Health (United States)
2011
Joint Center for Artificial Photosynthesis
2011
King University
2010
Peking University
2010
The deposition of 0.20, 0.15, and 0.04 μm diameter particles was measured in a human central airway cast using variable larynx with cyclic inspiratory flow. Data were compared theoretical predictions for from laminar flow the first seven generations. With exception tracheal deposition, which on average exceeded by factor 9, about twice that predicted. enhanced is attributable to secondary swirling flows. Less enhancement observed at higher rates as turbulence increases. surface density...
The effect of a single electric charge on the efficiency with which ultrafine particles deposit in human airways has been investigated. When inhaled short-lived radon progeny are attached to electrically neutral their deposition is controlled by diffusion. But most ambient carry one, or few, charges. We measured and compared (DE) singly charged, neutralized, zero-charge 20-nm 125-nm hollow-cast models airways. These particle sizes were selected because they about where modal peaks occur for...
Abstract Background Depression of peripheral blood cells is a well‐known indicator benzene hematotoxicity. Previous studies its effects on specific types have yielded inconsistent results. We examine hematological findings and their possible relations with exposure markers validated in recent biomarker project conducted Tianjin, China. Methods Personal exposures were sampled 3‐M organic vapor monitors, analyzed by gas chromatography. The counted cell counter. WBC differential was manually...
Background The present study was conducted among Chinese workers employed in glue- and shoe-making factories who had an average daily personal benzene exposure of 31±26 ppm (mean±SD). metabolites monitored were S-phenylmercapturic acid (S-PMA), trans, trans-muconic (t,t-MA), hydroquinone (HQ), catechol (CAT), 1,2,4-trihydroxybenzene (benzene triol, BT), phenol. Methods S-PMA, t,t-MA, HQ, CAT, BT quantified by HPLC-tandem mass spectrometry. Phenol measured GC-MS. Results Levels (except BT)...
Hollow replicate casts of a human tracheobronchial (TB) tree were used to evaluate the conditions and mechanisms affecting fiber deposition. These exposed an aerodynamically classified crocidolite asbestos aerosol at cyclic inspiratory flow rates 15 60 l/min. The deposited fibers washed from interior surfaces, their dimensions measured by scanning electron microscopy. Deposition efficiency was found increase with length rate, deposition densities greater bifurcations than along airway walls....
The ..cap alpha.. activity of cigarette smoke tar deposited onto membrane filters was found to be associated with the relatively insoluble fraction. Perfusion physiological saline resulted in no change mean measured activity, but there more variability values for perfused than initial samples. Analysis condensate shows that radium and thorium are present, over 99% results from /sup 210/Po. Repeat measurements after a time lapse 2 1/2 years indicate 210/Pb content is roughly 30 40% original...
The radon decay products lead-210 ((210)Pb) and polonium-210 ((210)Po) are known components of tobacco. China is the world's largest producer consumer cigarettes, yet no comprehensive published reports (210)Pb (210)Po activity concentrations in Chinese cigarettes available. Twelve brands that were commonly smoked within a group 184 smokers selected for analysis. For each brand, tobacco from two was isolated, dried, weighed, spiked with (209)Po tracer yield, digested concentrated HNO3,...
Experimental data on asbestos fiber deposition in hollow replicate casts of a human tracheobronchial tree were used to derive generic empirical model for the fibrous aerosols lung airways. The mechanisms primarily responsible under experimental conditions inertial impaction and interception. initial developed basis these two turbulent flow fit reasonably well fibers less than 10 μm length. addition term account influence partial turbulence interception efficiency improved longer model.
A new technique has been developed to measure ultra low alfa-activity on the bronchial mucosa of human lung specimens using cellulose nitrate track etch film as detector. The lower limit detection this system for a single is 0.30 fCi/cm2 when detector exposed about 1 cm2 surface 100 days and an average efficiency factor used. Measurements determine along were made in seven individuals. few areas slightly elevated activity measured each lungs examined except that young smoker. One area...
To provide quantitative evidence of the impact on people a neighboring metropolitan airport, La Guardia Airport (LGA) in New York City, (1) airborne particulate matter (PM) was measured to determine whether concentration differences could be detected between homes that are upwind and downwind airport; (2) 24-hr noise measurements were made 12 near (3) assessed by Community Wellness Health Promotion Survey. Particulate concentrations higher during active airport operating hours than...
The deposition of ultrafine (d ⩽ 200 nm) particles on airway surfaces is an important determinant the radiation dose that results from inhalation radon progeny. Diffusion dominant mechanism for progeny since most alpha particle activity particles. Freshly formed 218Po rapidly neutralized but, there remains some charged fraction each short-lived decay product. Theoretical predictions suggest a measurable increase in may result charge. We have measured and compared (η) monodisperse singly...
Factors have been evaluated which contribute to the lack of agreement between inhalation exposure estimates obtained by time-weighted averaging samples taken with mini hi-volume samplers, and those measured time integrating, low-volume, lapel mounted, personal monitors. Measurements made real-time aerosol monitors on workers at a Be-Cu production furnace show that part discrepancy results from variability concentration within breathing zone. Field studies sampler inlet bias, influences...