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In Dam Hwang 9 Articles
Metallothionein induction and its protective effect in liver and kidney of rats exposed to cadmium chloride.
Nam Song Kim, Jae Hyung Lee, Dai Ha Koh, No Suk Ki, In Dam Hwang
Korean J Prev Med. 1991;24(3):287-304.
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AbstractAbstract PDF
Tolerance to several toxic effects of cadmium, including lethality has been shown following pretreatment with cadmium and zinc. This study was designed to determine if tolerance also develops to Cd-induced hepatotoxicity and renal toxicity. Three groups of rats (A, B, C), each consisting of 16 rats, were studied and each group was divided into four subgroups (1, 2, 3, 4), 4 rats for each subgroup. Rats were subcutaneously pretreated with saline (A), CdCl2(0.5 mg/kg, B), and ZnCl2 (13.0 mg/kg, C) during time periods of 1~6 weeks. At the end of the period, rats were challenged with CdCl2 (3.0, 6.0 and 9.0 mg/kg, ip). After giving the challenge dose, cadmium and metallothionein (MT) concentrations were determined and also observed the histologic change in liver and kidney. The concentration of cadmium in liver and also observed the increased dose-dependently to the challenge dosage. These data indicate the kidney is a major target organ of chronic cadmium poisoning, and suggest that cadmium induced hepatic injury, via release of Cd-MT, may play and important role in the nephrotoxicity observed in response to long-term exposure to cadmium. In addition, histologic examination of group A2, A3 and A4 revealed moderate to severe cadmium toxicity, evidenced by infiltration of inflammatory cells, cell swelling, pyknosis, enlarged sinusoids and necrosis in liver, and tubule cell necrosis and degeneration in kidney. However, MT concentrations in liver and kidney were increased by the pretreatment of CdCl2 and ZnCl2 and their morphological findings were not significantly changed, comparing with control group. Higher MT concentration in liver and kidney observed in the pretreated groups constitutes a plausible explanation of the protective effects of pretreatment against the cadmium toxicity after challenge dosing.
Summary
Effect of Several Heavy Metals on the Frequencies of Sister Chromatid Exchanges and Chromosomal Aberrations in Human Lymphocytes.
Chae Deuk Jung, Jeong Sang Lee, Dai Ha Koh, No Suk Ki, In Dam Hwang
Korean J Prev Med. 1989;22(1):116-124.
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AbstractAbstract PDF
To assay the cytogenetic toxicity of NiCl, K2Cr2O7CdC12, and HgC12, the frequencies of sister chromatid exchanges(SCEs) and chromosomal aberrations were observed in the metaphase chromosomes of the human lymphocytes which were cultured with above materials. The frequencies of SCEs are dose-dependently increased by all materials in this experiment. Chromosomal aberrations, especially gap and break, are increased by the nickel and chromic compounds, while not significantly increased by the cadmium and mercurial compounds. This results indicate the dose dependent relationship between the frequencies of SCEs and the concentrations of the heavy metals, but the increasing rates of the SCEs induced by the heavy metals are less sensitive than other mutagens or carcinogens which were confirmed.
Summary
A Study on the Heavy Metal Contents of Soil and Rice in the Kum River Basin.
Young Oh Kim, Hyung Yul Yoo, Jae Hyung Lee, No Suk Ki, In Dam Hwang
Korean J Prev Med. 1988;21(2):320-328.
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AbstractAbstract PDF
This study was carried out to investigate the heavy metal contents and their correlations between paddy soil and brown rice near the Kum-River area. In this study, eighty soil samples and forty brown rice samples were taken from the paddy soil. The contents of heavy metals were measured by flame atomic absorption spectrophotometry. The results were as follows: 1. The average contents of soluble heavy metals in surface soil were Cd 0.19, Cu 15.31, Zn 18.10 and Pb 9.08 ppm. The average contents of soluble heavy metals in subsurface soil were Cd 0.19, Cu 14.52, Zn 17.75 and Pb8.11 ppm. There wan no statistically significant difference between the two layers. 2. The contents of Cu, Zn and Pb of Taejeon(S6) and Cd of Sinbyung(S5) in surface soil were higher than those of other areas. The contents of Cd and Cu of Taejeon(S6) and Zn and Pb of Kumnam(S3) in brown rice were higher than those of other areas and four heavy metals in soil and brown rice of Simchon(S7) were lower than those of other areas. 3. The ratio of soluble contents(Cd : Cu : Zn : Pb) in surface soil was 1 : 79 : 93 : 47, that of soluble contents in subsurface soil was 1 : 79 : 94 : 43, and that of total contents in brown rice was 1 : 84 : 294 : 12. 4. The correlations of the content between soluble heavy metals in surface(0-15 cm depth) soil total heavy metals in brown rice was found to be order of Cd>Cu>Zn>Pb. The correlations of the content between soluble heavy metals in subsurface(20-30 cm depth) soil and total heavy metals in brown rice was found to be order of Cu>Cd>Zn>Pb.
Summary
A study on the Heavy Metal Concentrations and Their Interrelationships in Women's Blood and Urine in small towns.
In Dam Hwang, No Suk Ki, Jae Hyung Lee, In Seo Park
Korean J Prev Med. 1987;20(1):49-55.
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AbstractAbstract PDF
The results of this study which had been investigated for the purpose of analyzing heavy metal concentrations in women's blood and urine, their correlation degree and significance of cadmium as indicator of accumulated heavy metals are as follows. 1) In blood, concentrations of Cd, Pb, Cu and Zn are respectively 0.0110+/-0.14 ug/ml, 0.208+/-138 ug/ml, 0.899+/-0.153 ug/ml and 5.432+/-1.020 ug/ml. 2) In urine, concentrations of Cd, Pb, Cu and Zn are respectively 0.003+/-0.12 ug/ml, 0.025+/-0.18 ug/ml, 0.013+/-0.12 ug/ml and 0.277+/-0.192 ug/ml. 3) Correlation coefficients between blood and urine are only significant in Zn (r=0.363, p<0.01). 4) In blood, correlation coefficients of Cd concentration and Pb, Zn are respectively 0.518 (p<0.01). 5) Correlation coefficients between Cd concentration in blood and Pb, Cu and Zn in urine are respectively r=-0.012, r=0.027, r=0.241 (p<0.05), and only Cd concentration and Zn is significant.
Summary
Effects of Anticancer Agents on Cell Cycle Kinetics and Sister Chromatid Exchanges in Cultured Human Lymphocytes.
In Dam Hwang, No Suk Ki, Won Kihl Park, Young Oh Kim, Jeong Sang Lee
Korean J Prev Med. 1987;20(1):1-9.
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AbstractAbstract PDF
Sister chromatid exchanges (SCEs) observed by means of bromodeoxyuridine substitution and fluorescence plus Giemsa (FPG) technique were proposed as a sensitive and quantitative assay for mutagenicity and cytotoxicity in short-term cultures of phytohaemagglutinin (PHA)-stimulated human lymphocytes. Therefore, this study was carried out to investigate the relation between anticancer agents and cytotoxic effects. Chromosomal analysis was performed on metaphase cells that had divided one, two, or three or more times after treatment for SCEs, mitotic indices (MI) and cell cycle kinetics by FPG technique. The results indicate that anticancer agents led to a dose dependent increase in SCE frequency except methotrexate. But, highly inhibited mitotic indices and delayed cell cycle kinetics were observed except for cyclophosphamide. The author suggest that the difference of SCE frequency is due to the differences in the cytotoxic action of anticancer agents, but although the induction of SCEs has a correlation with cell cycle delay, in some cases the induction of SCEs is not always related to cell cycle delay because of different cytotoxic action of anticancer agents.
Summary
A Study on the Degree of Impairment of Whole Person in Leprosy Patients.
Wook Hee Yoon, In Dam Hwang
Korean J Prev Med. 1986;19(2):263-272.
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AbstractAbstract PDF
During the 8 months from October 1985 to May 1986, the survey was performed on 211 leprosy patients over fifty years old, settled in the four villages of Iksan country, North of Chulla province. In that observation, we investigated the frequency and the degree of impairments according to sex, age, and anatomical location by the "guides to the evaluation of permanent impairment". The noticeable findings were made as follows: 1) Frequency of impairment by anatomical location was significantly higher in hand than eye and foot (p<0.01). 2) Frequency of impairment was significantly increased in eye according as age increase (p<0.01). 3) The degree of impairments of all patients was the highest in hand as 28.7%. 4) By the kinds of impairments, the flextion and the amputation were most common in hand and foot, and loss of central vision was common symptom in eye. 5) The degree of impairments of 211 leprosy patients was shown as 44.1% and increased according as age increase.
Summary
Effects of Mitomycin C on Sister Chromatid Exchanges in Cultured Human Lympocytes.
In Dam Hwang, No Suk Ki, Jeong Sang Lee, Nam Song Kim, Tae ll Mun
Korean J Prev Med. 1986;19(2):244-251.
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AbstractAbstract PDF
Sister chromatid exchanges(SCEs) and cell cycle kinetics were proposed as a sensitive and quantitative assay for mutagenicity and cytotoxicity in short-term cultures of phytohemagglutinin(PHA)-stimulated human lymphocytes. Therefore, this study was performed to investigate the relation between the cytotoxic effects and sister chromatid exchanges. The results are summarized as follows: 1) The frequency of SCEs per cell are 13.1+/-2.8 in the lower concentration of 6.25x10(-9) M and 75.8+/-8.2 in the highest concentration of 1.00+/-10(-7) M. Mitotic index is decreased in the higher concentration of mitomycin C. The result indicates that mitomycin C led to a dose dependent increase in SCE frequency, but decrease in mitotic index. 2) Chromosomal analysis was performed on metaphase cells that have divided one, two, and three or more times for cell cycle kinetics by fluorescence-plus-Giemsa(FPG) technique. According to the increased but the cells of third division are greatly decreased. 3) The frequency of SCEs per chromosome by chromocomal group are decreased gradually from A group to G group. But relationships between specific chromosomal group and SCEs frequency are not found.
Summary
Socio-medical Study on Gonorrhoea with Special References of Prevalence, PPNG and Antibiotic Resistance.
Seong Ho Lee, In Dam Hwang, Young Soo Park, Dai Ha Koh
Korean J Prev Med. 1983;16(1):41-50.
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AbstractAbstract PDF
The incidence of sexually transmitted disease, especially gonorrhoea has risen despite the progress in its diagnosis and treatment. For the effective control programs of sexually transmitted disease, it should be required socio-medical approaches. A study on gonorrhoea and penicillinase-producing Neisseria gonorrhoea (PPNG) was conducted in Jeonju and Kunsan area from March, 1982 through August, 1982. The 221 entertrainers were studied in order to determine the prevalences of gonorrhoea and PPNG. Socio-demographic informations of the entertainers were obtained by interviewing them. Gonococci were cultured on Thayer-Martin enrichment media for isolation, and PPNG was confirmed using beta-lactamase reagent(PADAC(tm) Beta-Lactamase Test Strips, Galbiochem-Behring). The results of the study are summarized as follows; 1. The average age of the entertainers studied was 26.1+/-4.7 years. 2. The average years of working in entertaining business was 2.4+/-1.4 years, and the average income per month was 239,592+/-90,480 won. On the education level, 70.6% of the entertainers were middle or high school graduates. 3. 47.5% of the entertainers were using contraceptives. 90.5% have experienced artificial abortion. 4. 37(16.7%) out of 221 entertainers were revealed to gonorrhoea, and 13(35.1%) of gonorrhoea patients were by PPNG. 5. The prevalence rates of gonorrhoea and the proportion of PPNG by age were not significant statistically. Meanwhile, the colelations between the rates of gonorrhoea and education, frequency of love-making with customers and type of sexual partner were highly significant statistically. 6. 37 strains of gonococci isolated were almost resistant to several antimicrobial agents, especially amikacin, clindamycin and chloramphenicol. Furthermore PPNG strains were completely resistant to not only above drugs but also penicillin.
Summary
A Study on industrial Accidents of Workers in Jeonbug Areas.
In Dam Hwang, Young Soo Park, Suk Kwon Suh
Korean J Prev Med. 1981;14(1):89-96.
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AbstractAbstract PDF
Of 2,740 industries in Jeonbug area which are covered by industrial insurance policy, 462 facilities which the accidents related to industry occurred during the year of 1979 were studied, and the results are summarized as follows; 1. The accidents related to industry occurred in 462 industries of the total 2,740 industrial facilities in Jeonbug area as of 1979. 2. The incidence rate accident per 1,000 workers was 34.3(49.2 in male workers and 12.8% in female workers), the frequency rate of the total industries in Jeonbug area was 13.36, and severity rate was 1.3. 3. The frequency rates and severity rates by type of industry in study area were quit different to compare with those of national rates. 4. The incidence rate of construction industry was 223.6 per 1,000 workers, and that of transportation-communication industries were 78.6. 5. The proportion of industrial accidents of 20-24 age group was 22.1 percent of the total accidents, and the proportions decreased according to age increase. 6. The incidence rate in the industry having less than 49 workers was 20.6 per 1,000 workers, that of industry with 50-99% workers was 26.7, that of industry with100-199 was 51.9, that of industry with 200-499 was 80.2 and that of with more than 500 workers was 40.7. 7. The accidents which occurred in the workers with experience of less than one year was 69.4 percent of the total accidents, otherwise, the longer the workers have worked the less accident they have. 8.The most accidents occurred in the shift between 10 to12 o'clock, and 16 to 18 hour. 9. The primary causes of the industrial accidents were found to be collisions, machinery, falling objects and falls. 10. The site of injury by type of industry were quit different, and the major site of injury was finger. 11. The laceration and open injuries of the accidents related to industry were 37.2 percent of the total ceases, and fractures or dislocations were 28.5 percent, and contusions were 6.5% percent. 12. Death rate of industrial accident was 5.0 per 1,000 workers, and those of industry were 47.6 in transportation, 42.8 in construction industry, 24.4 in mine industry, and 2.0 in manufacturing industry.
Summary

JPMPH : Journal of Preventive Medicine and Public Health