The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
Naomi Hisanaga - One of the best experts on this subject based on the ideXlab platform.
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comparison of lung Asbestos Fiber content in cancer subjects with healthy individuals with no known history of occupational Asbestos exposure in korea
Journal of Toxicology and Environmental Health, 2009Co-Authors: Jeong Hee Han, Kiyoshi Sakai, Naomi Hisanaga, Jung Duck Park, Hee Kyung Chang, Yong Hwan Lee, Il Hoon Kwon, Byungsun Choi, Yong Hyun Chung, Hyeon Yeong KimAbstract:To evaluate the effects of environmental Asbestos exposure on the inducement of lung cancer, pulmonary Asbestos and non-Asbestos Fiber content was determined in 36 normal Korean subjects and 38 lung cancer subjects with no known occupational history of Asbestos exposure. Pulmonary Asbestos Fiber content was measured by transmission electron microscopy (TEM) with energy-dispersive x-ray analysis after applying a low-temperature ashing procedure. Chrysotile Fibers were the major Fiber type found in the lungs of the Korean subjects. The Asbestos Fiber concentrations found in the lungs of normal males (25) and females (11) were 0.26 × 106 Fibers/g of dry lung tissue and 0.16 × 106 Fibers/g of dry lung tissue, respectively. The Asbestos concentrations found in the lungs of cancer subjects were 0.16 × 106 Fibers/g of dry lung tissue for 32 males and 0.44 × 106 Fibers/g of dry lung tissue for 6 females. No statistical difference was found in pulmonary Asbestos content between the normal and lung cancer subjects,...
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airborne Asbestos and non Asbestos Fiber concentrations in non occupational environments in korea
Industrial Health, 2004Co-Authors: Hyun-sul Lim, Ji Yong Kim, Kiyoshi Sakai, Naomi HisanagaAbstract:Both airborne Asbestos and non-Asbestos Fiber concentrations were evaluated in Korean non-occupational environments. The airborne Fiber concentrations were analyzed in 96 air samples, from 48 different points, by transmission electron microscopy, with energy-dispersive X-ray analysis. The geometric means of the airborne Asbestos and non-Asbestos Fiber concentrations were 0.62 and 67.86, and 0.30 and 17.47 Fibers/liter in urban and rural areas, respectively. There were significant differences in both the airborne Asbestos and non-Asbestos Fiber concentrations between the urban and rural areas (p<0.05). The geometric means of airborne Asbestos and non-Asbestos Fiber concentrations were 0.67 and 37.93, and 0.27 and 30.67 Fibers/liter at the points less than 10 m and more than 30 m away from highways, respectively. The airborne Asbestos concentrations were significantly higher at the points less than 10 m away than at the points more than 30 m away from highways (p<0.01).
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Airborne Asbestos and non-Asbestos Fiber concentrations in non-occupational environments in Korea.
Industrial health, 2004Co-Authors: Hyun-sul Lim, Ji Yong Kim, Kiyoshi Sakai, Naomi HisanagaAbstract:Both airborne Asbestos and non-Asbestos Fiber concentrations were evaluated in Korean non-occupational environments. The airborne Fiber concentrations were analyzed in 96 air samples, from 48 different points, by transmission electron microscopy, with energy-dispersive X-ray analysis. The geometric means of the airborne Asbestos and non-Asbestos Fiber concentrations were 0.62 and 67.86, and 0.30 and 17.47 Fibers/liter in urban and rural areas, respectively. There were significant differences in both the airborne Asbestos and non-Asbestos Fiber concentrations between the urban and rural areas (p
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Pulmonary Asbestos and non-Asbestos Fiber concentrations in autopsied inhabitants in Pohang, Korea.
Industrial health, 2004Co-Authors: Hyun-sul Lim, Ji Yong Kim, Kiyoshi Sakai, Naomi HisanagaAbstract:To establish reference values for pulmonary Asbestos and non-Asbestos Fiber concentrations in rural Korean residents, and their comparison with those of urban Korean residents and the Japanese, autopsied lung samples from 22 subjects (20 males and 2 females), in Pohang, without known occupational Asbestos exposure histories, were analyzed for Asbestos and non-Asbestos Fibers, using transmission electron microscope equipped with an energy dispersive X-ray analyzer. Chrysotile was the major Fiber type found in the lungs of the subjects. The residents in Pohang had significantly lower Asbestos and non-Asbestos Fiber concentrations than the Korean urban residents. The Koreans had significantly lower Asbestos and non-Asbestos Fiber concentrations than the Japanese.
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Asbestos and non Asbestos Fiber content in lungs of korean subjects with no known occupational Asbestos exposure history
Environment International, 1998Co-Authors: Young Hahn Moon, Kiyoshi Sakai, Naomi Hisanaga, Jung Duck Park, Yasuhiro TakeuchiAbstract:Abstract To provide an estimation of Asbestos exposure among normal Koreans and a criterion for determining occupational Asbestos exposed diseases, pulmonary Fiber contents of both Asbestos and non-Asbestos types were evaluated in 20 Korean subjects with no known occupational history of Asbestos exposure. Pulmonary Fiber contents were analyzed by transmission electron microscopy with energy dispersive X-ray analysis after using the low temperature ashing procedure. Chrysotile Fiber (65.5%) was the major Fiber type found in the lungs of Korean subjects. Asbestos Fiber concentrations found in males and females were 0.30 × 10 6 Fibers/g of dry lungs and 0.15 × 10 6 Fibers/g of dry lungs, respectively, showing a geometric mean concentration of 0.26 × 10 6 Fibers/g of dry lung tissue. Non-Asbestos Fiber contents found in males and females were 8.02 × 10 6 Fibers/g of dry lungs and 7.85 × 10 6 Fibers/g of dry lungs, respectively, with a geometric mean concentration of 7.98 × 10 6 Fibers/g of dry lungs. There was no difference in Asbestos content in lungs among various age groups. Comparing these results with Japanese male (2.11 × 10 6 Fibers/g of dry lung) and female subjects (1.38 × 10 6 Fibers/g of dry lung), Korean male and female subjects had much less Asbestos in their lungs.
Zahra Eslami - One of the best experts on this subject based on the ideXlab platform.
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effect of zirconia on ablation mechanism of Asbestos Fiber phenolic composites in oxyacetylene torch environment
Ceramics International, 2013Co-Authors: Mir Asad Mirzapour, Hasan Rezaei Haghighat, Zahra EslamiAbstract:Abstract Micron-size zirconium oxide (ZrO2) was used to improve the thermal stability and ablation properties of Asbestos Fiber/phenolic composites and to reduce their final cost. ZrO2/Asbestos/phenolic composites were prepared in an autoclave by the curing cycle process. The densities of the composites were in the range of 1.64–1.82 g/cm3. The ablation properties of composites were determined by oxyacetylene torch environment and burn-through time, erosion rates and back surface temperature in the first required 20 s. To understand the ablation mechanism, the morphology and phase composition of the composites were studied by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. Thermal stability of the produced materials was estimated by means of thermal gravimetric analysis, in air which consisted of dynamic scans at a heating rate of 10 °C/min from 30 to 1000 °C with bulk samples of about 23±2 mg. The thermal stability of the composites was enhanced by adding ZrO2. The results showed that the linear and mass ablation rates of the composites after adding 14 wt% ZrO2 decreased by 58% and 92%, respectively. The back surface temperature of a sample with 14% zirconia was 49% lower than that of pure composite. The SEM studies showed that, modified composites displayed much lower porosity than that of non-modified composite and the destruction of Asbestos Fibers was very low. On the other hand, it appeared that a thin melted layer of ZrO2 covered the surfaces of zirconia-containing composites.
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Effect of zirconia on ablation mechanism of Asbestos Fiber/phenolic composites in oxyacetylene torch environment
Ceramics International, 2013Co-Authors: Mir Asad Mirzapour, Hasan Rezaei Haghighat, Zahra EslamiAbstract:Abstract Micron-size zirconium oxide (ZrO2) was used to improve the thermal stability and ablation properties of Asbestos Fiber/phenolic composites and to reduce their final cost. ZrO2/Asbestos/phenolic composites were prepared in an autoclave by the curing cycle process. The densities of the composites were in the range of 1.64–1.82 g/cm3. The ablation properties of composites were determined by oxyacetylene torch environment and burn-through time, erosion rates and back surface temperature in the first required 20 s. To understand the ablation mechanism, the morphology and phase composition of the composites were studied by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. Thermal stability of the produced materials was estimated by means of thermal gravimetric analysis, in air which consisted of dynamic scans at a heating rate of 10 °C/min from 30 to 1000 °C with bulk samples of about 23±2 mg. The thermal stability of the composites was enhanced by adding ZrO2. The results showed that the linear and mass ablation rates of the composites after adding 14 wt% ZrO2 decreased by 58% and 92%, respectively. The back surface temperature of a sample with 14% zirconia was 49% lower than that of pure composite. The SEM studies showed that, modified composites displayed much lower porosity than that of non-modified composite and the destruction of Asbestos Fibers was very low. On the other hand, it appeared that a thin melted layer of ZrO2 covered the surfaces of zirconia-containing composites.
Norman Katz B - One of the best experts on this subject based on the ideXlab platform.
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correlation of Asbestos Fiber burdens in fallopian tubes and ovarian tissue
American Journal of Obstetrics and Gynecology, 1999Co-Authors: Debra S Heller, Ronald E Gordon, Norman Katz BAbstract:Abstract Evidence suggests an increased risk of ovarian cancer with Asbestos exposure. Ovaries and corresponding fallopian tubes were studied by analytic electron microscopy. There was 71.4% agreement between tube and ovary for presence-type of Asbestos. The fallopian tube can provide useful information regarding Asbestos exposure when no ovarian tissue is available. (Am J Obstet Gynecol 1999;181:346-7.)
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correlation of Asbestos Fiber burdens in fallopian tubes and ovarian tissue
American Journal of Obstetrics and Gynecology, 1999Co-Authors: Debra S Heller, Ronald E Gordon, Norman Katz BAbstract:Evidence suggests an increased risk of ovarian cancer with Asbestos exposure. Ovaries and corresponding fallopian tubes were studied by analytic electron microscopy. There was 71.4% agreement between tube and ovary for presence-type of Asbestos. The fallopian tube can provide useful information regarding Asbestos exposure when no ovarian tissue is available.
Abbas Shahsavani - One of the best experts on this subject based on the ideXlab platform.
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Monitoring of airborne Asbestos Fibers in an urban ambient air of Shahryar City, Iran: levels, spatial distribution, seasonal variations, and health risk assessment
Environmental Science and Pollution Research, 2019Co-Authors: Farhad Taghizadeh, Ahmad Jonidi Jafari, Mitra Gholami, Majid Kermani, Hossein Arfaeinia, Saeid Mohammadi, Mohsen Dowlati, Abbas ShahsavaniAbstract:Asbestos, as with other pollutants in the air, has adverse effects on the health of human beings and animals. Today, the relationship between presence of Asbestos Fibers in the air breathed by humans and developing serious diseases such as lung cancer (Asbestosis) and mesothelioma has been proven. This study was designed and conducted within the time period of August 2017 and June 2018 to determine the concentration of Asbestos Fiber in the ambient air of Shahryar City and to evaluate their health effects for the general population of the city. For this purpose, samples were taken from four points, and overall 32 air samples were taken along the year. The samples were then analyzed by the phase contrast microscopy (PCM) method. Also, to investigate the type of Asbestos and for more accurate counting of Fibers, SEM analysis was utilized. Finally, based on the EPA IRIS method, the health effects resulting from Asbestos risks were also evaluated. The results of this study indicated that the mean annual concentration of Asbestos Fiber in the ambient air of Shahryar City was obtained as 0.0019 f/ml PCM and 0.0072 f/ml SEM. Furthermore, the most polluted point was S1 point (0.0119 –0.0026 f/ml, PCM), while the lowest concentration was related to S4 point (0.001 f/ml PCM–0.0021 f/ml SEM). The mean annual risk resulting from airborne Asbestos Fiber in the ambient air of Shahryar City for all samples was obtained as 1.72 × 10^−6 to 2.2 × 10^−4, which was higher than the recommended risk range in some points.
P Sebastien - One of the best experts on this subject based on the ideXlab platform.
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Asbestos Fiber type and length in lungs of chrysotile textile and production workers Fibers longer than 18 μm
Inhalation Toxicology, 2000Co-Authors: Bruce W Case, A Dufresne, A D Mcdonald, J C Mcdonald, P SebastienAbstract:Excess lung cancer risk for a cohort of chrysotile textile plant workers was many times the risk observed in a cohort of chrysotile miners/millers. The latter had greater exposure to chrysotile/tremolite. A previous lung burden study confirmed this excess exposure in miners/millers and showed little difference in Fiber length. Selection of too short a Fiber length cut-off (5 µm or more) in the previous study could have masked differences in lung-retained Fiber length. In this follow-up, we counted only those intrapulmonary Fibers exceeding 18 µm in length. Lung Fiber concentration and dimension were assessed by transmission electron microscopy (TEM) and energy-dispersive x-ray spectrometry (EDS) for autopsy samples from 64 textile workers and 43 chrysotile miners and millers. These long Fibers were significantly more concentrated in the lungs of chrysotile miners and millers, consistent with their greater exposure. However, when only these longest Fibers were compared, there was a somewhat greater mean and median intrapulmonary Fiber length for chrysotile textile workers (mean Fiber length, all Fiber types combined, 25.2 ± 10.2 µm vs. 22.9 ± 6.6 µm in miners/millers, < .001; medians 21.6 vs. 20, p < .05). Despite their lesser apparent lung cancer risk, chrysotile, tremolite, total amphibole, and total long Fiber Asbestos concentrations were all highest in the lungs of miners/millers. Twenty-two of 64 textile workers had lung content of crocidolite and/or amosite (32.5% of 508). These amosite/crocidolite Fibers were present in the lungs of workers who ceased employment prior to the first use of such Fibers recorded in this industry. The results suggest that (I) Asbestos Fiber length differences cannot explain the difference in lung cancer risk excess and slope between cohorts and (2) the experience of textile workers should not be used to assess risk of lung cancer in miners, cement workers, and friction product workers, regardless of Fiber type.
