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Hire mold consultants Phillip Fry and Divine Fry to find air conditioning mold, workplace mold, and mold hidden inside the walls, ceilings, floors, crawl space, attic, basement, and HVAC equipment and system of your house, condominium, office, workplace, or other building anywhere in Chandler, Flagstaff, Mesa, Peoria, Phoenix, Scottsdale, Tempe, Tucson, and anywhere else in Arizona.  Lead Test Kits Mold Training  Mold Inspector Directory  Industrial Hygienist Training  Industrial Hygienist Directory  Mold Inspection Questions & Answers

THE EFFECTS OF OZONE AND NEGATIVE AIR IONS ON MICROORGANISMS
Authors:      L. Fan, J. Song, P.D. Hildebrand, C.F. Forney
Keywords:      viability, synergism, Pseudomonas fluorescens, Erwinia carotovora pv. carotovora, Escherichia coli
Abstract:
The control of microorganisms on fresh produce is very important to the food industry in order to maintain quality and ensure safety. Pseudomonas fluorescens and Erwinia carotovora pv. carotovora are plant pathogens that cause decay of many fresh fruits and vegetables during storage. Strains of Escherichia coli are pathogenic to humans and have been found on contaminated produce. In this study, dilute cell suspensions of P. fluorescens, E. carotovora pv. carotovora, and E. coli were inoculated onto potato dextrose agar (PDA) and subsequently exposed to 100 ± 5 nl∙L-1 ozone and/or 106 negative air ions (NAI)∙ml-1 to determine the effect of these treatments on cell viability. Treatment with NAI alone had no killing effect on any of the bacterial cells of all three species. However, ozone was effective in killing all three species and the addition of NAI enhanced this killing effect. P. fluorescens was most susceptible to the combined treatment; viability was reduced to 0.7% after 6 h, while 76% of the cells remained viable when exposed to ozone alone. Viability of E. carotovora pv. carotovora was reduced to 4% after 6 h in the combined treatment compared with 69% when exposed to ozone alone. E. coli was more resistant to the combined treatment; viability was reduced to only 40% after 11 h compared with 70% in the ozone alone treatment. Other factors, including the culture media used, influenced the effectiveness of ozone and NAI to kill bacteria and requires further study. The synergism of NAI with ozone may provide an effective method to reduce microbial contamination resulting in produce with less decay and risk of food borne disease.
 

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Hire mold consultants Phillip Fry and Divine Fry to find air conditioning mold, workplace mold, and mold hidden inside the walls, ceilings, floors, crawl space, attic, basement, and HVAC equipment and system of your house, condominium, office, workplace, or other building anywhere in Chandler, Flagstaff, Mesa, Peoria, Phoenix, Scottsdale, Tempe, Tucson, and anywhere else in Arizona.  Lead Test Kits Mold Training  Mold Inspector Directory  Industrial Hygienist Training  Industrial Hygienist Directory  Mold Inspection Questions & Answers

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