1.Effect of ozone on nasal mucosa inflammation.
Journal of Asthma, Allergy and Clinical Immunology 2002;22(2):399-400
No abstract available.
Inflammation*
;
Nasal Mucosa*
;
Ozone*
2.The ozone discotheque fire disaster.
Philippine Journal of Surgical Specialties 2010;65(1):14-19
To present a critique of the disaster management, the pre-disaster, disaster and post-disaster events surrounding the Ozone Disco fire, the worst land fire disaster in the Philippine history, that occurred on March 19, 1996 were retrieved and summarized from available and verifiable records. The disaster events were analyzed based on the principles of disaster management, particularly in the medical care of the casualties and the operational structures existing in the region at that time. The existing disaster plan of the hospital involved was included in the analysis. Conclusions were set to refocus interest in the disaster and provide basis for planning in disaster preparedness.
Ozone ; Philippines ; Disaster Planning ; Disasters ; Fires ; Hospitals
4.Pulmonary Function Changes of Ozone Exposed Workers in a Film Manufacturing Company.
Yoomi CHAE ; Hyunjoo KIM ; Sangchul ROH
Korean Journal of Occupational and Environmental Medicine 2007;19(3):215-222
OBJECTIVES: To investigate the pulmonary function changes of ozone exposure in Corona and Slitter workers exposed to an ozone level ranging from 0.022~0.061 ppm. METHODS: Forty-two subjects were exposed for 8hrs to ozone every day. We perfomed pulmonary function testing immediately before and after work and self-administered, portable peak flow meter measurements were self-conducted by the workers over a 5-day (Monday to Friday) period. RESULTS: Ozone concentrations in the workplace ranging from 0.050~0.061 ppm at Corona and 0.022~0.023 ppm at Slitter in 2006. A small decrement in forced-vital capacity were observed among Corona workers from 93.9% to 91.3% (p=0.012) and also in employment duration below ten years. We found no significant differences in before and after FVC and FEV1 among Slitter workers. All daily (Monday to Friday) peak expiratory flow rates declined in magnitude after two days of ozone exposure, compared with first day exposure. CONCLUSION: We concluded that daily ozone exposure in the workplace slightly decreased pulmonary function and that PEFR variability is greatest on the 2nd day of ozone exposure.
Employment
;
Ozone*
;
Peak Expiratory Flow Rate
;
Respiratory Function Tests
5.The Measurement of UVA and UVB Photoprotectiveness and its Influencing Factors.
Korean Journal of Dermatology 1997;35(6):1043-1051
Recently, exposure to sunlight is increasing due to expanded life time, outdoor leisures, and reduced sun protective ozone layer. Sunlight can produce not only benefit but also various kinds of harmful effect, such as skin carcinogenesis, photoaging and immunologic alterations, These effects can be minimized by sunscreens. This article reviews the methods to measure a suncreens efficacy and factors influencing the measurement. I. Measurement of photoprctective efficacy 1)The sun protective factor(SPF): The SPF is defined as the ratio of the UVB doses required to produce minimal erythema dose(MED) with sunscreen applied to without it. However, the exact procedures are not estabiished and the value is varied by methods. 2)Photoprotective factor A(FFA): In spite of its clinical improtance, evaluation of UVA protection rernains a problem due to its physiologic features. The methods to measure UVA protection are by the use of erythemal, phototoxic and pigmentary rections. 3)Outdoor measurement: It is ideal to measure the photoprotectiveness outdoor but a wide variation in value results from radiance sources and environmental factors. II. Factors influencing the evaluation The radiance sources, individ zal sensitivity to sunlight, product components and various environmental factors can make differences. Conclusion As more sunlight, exposure, he irnportance of photoprotection is increasing. The exact methods to measure the protectiveness of UVA and UVB should be established, especially adjusted to Korean people
Carcinogenesis
;
Erythema
;
Leisure Activities
;
Skin
;
Solar System
;
Stratospheric Ozone
;
Sunlight
;
Sunscreening Agents
6.Effects of ozone on influenza virus-induced airway hyperreactivity in rats.
Journal of Asthma, Allergy and Clinical Immunology 2000;20(5):749-754
BACKGROUND: Ozone is one of the most ubiquitous oxidant in urban air and may exacerbate respiratory diseases such as asthma. OBJECTIVE: We examined whether ozone can influence airway hyperresponsiveness induced by influenza virus-infection. SUBJECT AND METHOD: Rats were exposed to ozone, acutely to 1.0ppm and 0.25ppm for 23.5hrs. At 2hrs post cessation of ozone exposure, animals were infected with rat-adapted influenza virus intra-nasally. On day 3 post-virus inoculation, pulmonary mechanics were measured during an intravenous challenge with acetylcholine < (ACh), 100-140mg/ml in saline>. Cumulative doseresponse functions were obtained by doubling the rate of the intravenous infusion every 2min. RESULTS: ACh increased airway resistance in a dose-dependent manner. Neither of the concentrations of ozone altered the airway responses to ACh. Animals infected with virus developed hyperresponsiveness to ACh as was expected. Pre-exposure to 1.0ppm ozone for 23.5hrs aug- mented the virus-induced airway hyperresponsiveness, while 0.25ppm did not. CONCLUSION: Acute exposure to ozone can synergistically act on virus-induced airway hyperreactivity.
Acetylcholine
;
Airway Resistance
;
Animals
;
Asthma
;
Influenza, Human*
;
Infusions, Intravenous
;
Mechanics
;
Orthomyxoviridae
;
Ozone*
;
Rats*
7.Influence of ozone and paracetic acid disinfection on adhesion of resilient liners to acrylic resin.
The Journal of Advanced Prosthodontics 2016;8(4):290-295
PURPOSE: The aim of this study was to evaluate the effect of paracetic acid (PAA) and ozone disinfection on the tensile bond strength (TBS) of silicone-based resilient liners to acrylic resins. MATERIALS AND METHODS: One hundred and twenty dumbbell shaped heat-polymerized acrylic resins were prepared. From the mid segment of the specimens, 3 mm of acrylic were grinded off and separated parts were reattached by resilient liners. The specimens were divided into 2 control (control1, control7) and 4 test groups of PAA and ozone disinfection (PAA1, PAA7, ozone1 and ozone7; n=10). While control groups were immersed in distilled water for 10 min (control1) and 7 days (control7), test groups were subjected to PAA (16 g/L) or ozone rich water (4 mg/L) for 1 cycle (10 min for PAA and 60 min for ozone) per day for 7 days prior to tensile tests. Measurements of the TBS were analyzed using 3-way ANOVA and Tukey's HSD test. RESULTS: Adhesive strength of Mollosil decreased significantly by application of ozone disinfection. PAA disinfection had no negative effect on the TBS values of Mollosil and Molloplast B to acrylic resin. Single application of ozone disinfection did not have any negative effect on TBS values of Molloplast B, but prolonged exposure to ozone decreased its adhesive strength. CONCLUSION: The adhesion of resilient liners to acrylic was not adversely affected by PAA disinfection. Immersion in ozonated water significantly decreased TBS of Mollosil. Prolonged exposure to ozone negatively affects adhesion of Molloplast B to denture base materials.
Acrylic Resins
;
Adhesives
;
Denture Bases
;
Disinfection*
;
Immersion
;
Ozone*
;
Peracetic Acid
;
Water
8.Short-term Effects of Air Pollution on Hospital Visits for Respiratory Diseases in Seoul.
Jong Han LEEM ; Jong Tae LEE ; Dong Gi KIM ; Dong Chun SHIN ; Jae Hoon ROH
Korean Journal of Occupational and Environmental Medicine 1998;10(3):333-342
Several studies have reported the associations between airborne particles and/or ozone and respiratory diseases. This study examined whether such an association could be seen in Seoul, one of the greatest city in Korea. We compiled daily records of hospital visits in Seoul from November 1, 1995 to October 31, 1996. The daily averages of ozone and particle matter whose diameter is 10 micrometer or less(PM10) from all monitoring stations were computed. Daily respiratory hospital visits were regressed on temperature, humidity, day of weak indicators, seasonal variation indicators, and air pollution. Each pollutant was first examined individually and then two pollutant models were fitted. RESULTS : Both PM10 and Ozone were associated with increased risk of respiratory hospital visits. The relative risk of respiratory hospital visits for 50 microgram/m3 increase in PM10(lagged 2 days) was 1.11(95% confidence interval: 1.05-1.18). The PM10 associations was insensitive to alternative methods of control for weather, including exclusion of extreme temperature days and control for temperature on another day. The ozone results were more sensitive to the approach for weather control. The relative risk of respiratory hospital visits for 0.01 ppm increase in O3 was 1.08(95% confidence interval 1.00-1.17). The magnitude of the PM10 effect in Seoul, where SO2 was essential present, was similar to that reported in the Europe and United states. In conclusion, The consistency of investigations of the health effects of air pollution suggest that attention should be paid to the control of air pollution.
Air Pollution*
;
Europe
;
Humidity
;
Korea
;
Ozone
;
Seasons
;
Seoul*
;
United States
;
Weather
9.Short-term Effect of Air Pollution on Respiratory Disease in Seoul : A Case-Crossover Study.
Young Ju LEE ; Jong Tae LEE ; Young Su JU ; Dong Chun SHIN ; Hyoung June IM ; Soo Hun CHO
Korean Journal of Preventive Medicine 2001;34(3):253-261
OBJECTIVES: To evaluate the hypothesis that air pollution could increase emergency room visits for respiratory diseases, and if so, to quantify the strength of association between those. METHODS: We compiled daily records of hospital emergency room visits for respiratory diseases in Seoul, from November 1. 1995 to October 31. 1996, by using medical utilization data of unscheduled visits. In addition, air quality and weather data for the same period was collected. And a case-crossover design was applied by adopting conditional logistic regression analysis to determine the relationship between air pollutants and emergency room visits for respiratory diseases. In particular, the control periods were chosen by a bidirectional paired matching technique 7, 14, and 21days before and after the case periods. RESULTS: Only ozone was associated with the increased number of emergency room visits for respiratory diseases. The relative risk according to a 30ppb increase of ozone concentration (24hr mean, lagged 1day) was 1.91 (95% confidence interval = 1.78-2.05). CONCLUSION: There was a statistically significant association between the ambient ozone and daily emergency room visits for respiratory diseases.
Air Pollutants
;
Air Pollution*
;
Emergency Service, Hospital
;
Logistic Models
;
Ozone
;
Seoul*
;
Weather
10.The Transmittance of UVA and UVB on Human Epidermis.
Yoo Won CHOI ; Hyung Chul KANG
Korean Journal of Dermatology 1997;35(3):485-490
BACKGROUND: Ultraviolet light induces sunburn, ageing of the skin, pigmentation and even promotes skin cancers. As there has been a recent decrease in the ozone layer surrounding the earth, increasing attention has been given to the effects of ultraviolet light on the skin. Through human epidermis, ultraviolet light is reflected, scattered, absorbed or transmitted. In caucacians, the rate of transmitted ultraviolet light A from the epidermis to the dermis is 50% and the rate of transmitted ultraviolet light B is below 10%. OBJECTIVE: The purpose of this study was to evaluate the transmittance of UVA and UVB on Korean normal epidermis. METHODS: Pure epidermis was obtained from normal human epidermis by suction of blisters in 12 patients with vitiligo. All specimens were irradiated respectively with UVA and UVB and the amount of transmitted energy was measured. RESULTS: 1. The transmittance of UVA energy density by normal epidermis was 47.7+11.2% of irradiated UVA energy. 2. The transmittance of UVB energy density by normal epidermis was 32.4+3.4% of irradiated UVB energy. CONCLUSION: UVA energy transmission through normal epidermis of Korean is less than those of Caucacians but UVB energy transmission through nor mal epidermis of Korean is more than those of Caucacians. It is suggested that this could be an important basic data to study for photoaging and photoprotection in Korean population.
Blister
;
Dermis
;
Epidermis*
;
Humans*
;
Pigmentation
;
Skin
;
Skin Neoplasms
;
Stratospheric Ozone
;
Suction
;
Sunburn
;
Ultraviolet Rays
;
Vitiligo