Jung, Jae Hee Lee, Jung Eun 2024-01-20T11:02:03Z 2024-01-20T11:02:03Z 2021-09-05 2013-12 1352-2310 https://pubs.kist.re.kr/handle/201004/127381 Bioaerosols, including aerosolized bacteria, viruses, and fungi, are associated with public health and environmental problems. One promising control method to reduce the harmful effects of bioaerosols is thermal inactivation via a continuous-flow high-temperature short-time (HTST) system. However, variations in bioaerosol physical characteristics - for example, the particle size and shape - during the continuous-flow inactivation process can change the transport properties in the air, which can affect particle deposition in the human respiratory system or the filtration efficiency of ventilation systems. Real-time particle monitoring techniques are a desirable alternative to the time-consuming process of microscopic analysis that is conventionally used in sampling and particle characterization. Here, we report in situ real-time optical scattering measurements of the physical characteristics of airborne bacteria particles following an HTST process in a continuous-flow system. Our results demonstrate that the aerodynamic diameter of bacterial aerosols decreases when exposed to a high-temperature environment, and that the shape of the bacterial cells is significantly altered. These variations in physical characteristics using optical scattering measurements were found to be in agreement with the results of scanning electron microscopy analysis. (C) 2013 Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD BACILLUS-SUBTILIS SPORES ULTRAVIOLET GERMICIDAL IRRADIATION ESCHERICHIA-COLI PERFORMANCE EVALUATION THERMAL INACTIVATION AIR-FLOW BIOAEROSOLS EXPOSURE MICROORGANISMS NANOPARTICLES In situ real-time measurement of physical characteristics of airborne bacterial particles Article 10.1016/j.atmosenv.2013.09.018 1 ATMOSPHERIC ENVIRONMENT, v.81, pp.609 - 615 ATMOSPHERIC ENVIRONMENT 81 609 615 scie scopus 000329377600065 2-s2.0-84885817909 Environmental Sciences Meteorology & Atmospheric Sciences Environmental Sciences & Ecology Meteorology & Atmospheric Sciences Article BACILLUS-SUBTILIS SPORES ULTRAVIOLET GERMICIDAL IRRADIATION ESCHERICHIA-COLI PERFORMANCE EVALUATION THERMAL INACTIVATION AIR-FLOW BIOAEROSOLS EXPOSURE MICROORGANISMS NANOPARTICLES Bioaerosols Thermal inactivation Real-time measurement Particle shape