This study investigates how pathogen-laden respiratory droplets transfer diseases viainanimate surfaces. Respiratory fluid ejections containing pathogens pose a significanthealth threat, especially in high-traffic are...This study investigates how pathogen-laden respiratory droplets transfer diseases viainanimate surfaces. Respiratory fluid ejections containing pathogens pose a significanthealth threat, especially in high-traffic areas such as hospitals, public transport, restaurants,and schools. When these droplets dry on surfaces, they form deposits that cantransfer pathogens to healthy individuals through contact and can be ingested via theoral or nasal route. The study examined the effects of varying salt and mucin concentrationsin respiratory fluid droplets containing Pseudomonas aeruginosa. Results showedthat P. aeruginosa viability increased 10-fold at elevated mucin concentrations, whilechanges in salt concentration had minimal impact. Adhesive properties of the depositswere analyzed using atomic force spectroscopy and scotch tape test.Pathogen transferfrom the deposit to a fingerprint patterned model thumb at different relative humidity(RH) levels was assessed using confocal microscopy, showing significant pathogentransfer at elevated RH. Out of 106 CFU/mL pathogens in deposits, 17%‒38% arepotentially transferable, with most of the transfer occurring from the droplet’s edgedeposits. The study demonstrated that the combined variation in salt and mucin concentrationssignificantly influences the evaporation, flow, and precipitation dynamicsof droplets. These changes, in turn, affect the solutal deposition and distribution ofpathogens within the droplet, ultimately altering the survivability and transmissibilityof the pathogen.展开更多
The characteristics of radiation and drying properties of TiO2 bulb in the fixed bed with infrared radiation have been studied in this paper, and the experiments on drying dynamics has been analysed also. The optimiz...The characteristics of radiation and drying properties of TiO2 bulb in the fixed bed with infrared radiation have been studied in this paper, and the experiments on drying dynamics has been analysed also. The optimization of heat and mass transfer data has been determined, which could provide the scientific basis for engineering design.展开更多
文摘This study investigates how pathogen-laden respiratory droplets transfer diseases viainanimate surfaces. Respiratory fluid ejections containing pathogens pose a significanthealth threat, especially in high-traffic areas such as hospitals, public transport, restaurants,and schools. When these droplets dry on surfaces, they form deposits that cantransfer pathogens to healthy individuals through contact and can be ingested via theoral or nasal route. The study examined the effects of varying salt and mucin concentrationsin respiratory fluid droplets containing Pseudomonas aeruginosa. Results showedthat P. aeruginosa viability increased 10-fold at elevated mucin concentrations, whilechanges in salt concentration had minimal impact. Adhesive properties of the depositswere analyzed using atomic force spectroscopy and scotch tape test.Pathogen transferfrom the deposit to a fingerprint patterned model thumb at different relative humidity(RH) levels was assessed using confocal microscopy, showing significant pathogentransfer at elevated RH. Out of 106 CFU/mL pathogens in deposits, 17%‒38% arepotentially transferable, with most of the transfer occurring from the droplet’s edgedeposits. The study demonstrated that the combined variation in salt and mucin concentrationssignificantly influences the evaporation, flow, and precipitation dynamicsof droplets. These changes, in turn, affect the solutal deposition and distribution ofpathogens within the droplet, ultimately altering the survivability and transmissibilityof the pathogen.
文摘The characteristics of radiation and drying properties of TiO2 bulb in the fixed bed with infrared radiation have been studied in this paper, and the experiments on drying dynamics has been analysed also. The optimization of heat and mass transfer data has been determined, which could provide the scientific basis for engineering design.
