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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Environmental Health Sciences
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Journal DOI :
Korean Society of Environmental Health
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Volume & Issues
Volume 35, Issue 6 - Dec 2009
Volume 35, Issue 5 - Oct 2009
Volume 35, Issue 4 - Aug 2009
Volume 35, Issue 3 - Jun 2009
Volume 35, Issue 2 - Apr 2009
Volume 35, Issue 1 - Feb 2009
Selecting the target year
Environmental Pollutants and Epigenetics
Park, Sung-Kyun ; Lee, Sun-Dong ;
Korean Journal of Environmental Health Sciences, volume 35, issue 5, 2009, Pages 343~354
DOI : 10.5668/JEHS.2009.35.5.343
Since Barker found associations between low birth weight and several chronic diseases later in life, the hypothesis of fetal origins of adult disease (aka, Barker Hypothesis) and epigenetics have been emerging as a new paradigm for geneenvironment interaction of chronic disease. Epigenetics is the study of heritable changes in gene silencing that occur without any change in DNA sequence. Gene expression can be regulated by several epigenetic mechanisms, including DNA methylation and histone modifications, which may be associated with chronic conditions, such as cancers, cardiovascular disease, and type-2 diabetes. One carbon metabolism which involves the transfer of a methyl group catalyzed by DNA methyltransferase is an important mechanism by which DNA methylation occurs in promoter regions and/or repetitive elements of the genome. Environmental factors may induce epigenetic modification through production of reactive oxygen species, alteration of methyltransferase activity, and/or interference with methyl donors. In this review, we introduce recent studies of epigenetic modification and environmental factors, such as heavy metals, environmental hormones, air pollution, diet and psychosocial stress. We also discuss epigenetic perspectives of early life environmental exposure and late life disease occurrence.
Exposure Level of Airborne Bacteria in the University Laboratories in Seoul, Korea
Hwang, Sung-Ho ; Yoo, Kyong-Nam ; Park, Ji-Ho ; Park, Dong-Uk ; Yoon, Chung-Sik ;
Korean Journal of Environmental Health Sciences, volume 35, issue 5, 2009, Pages 355~361
DOI : 10.5668/JEHS.2009.35.5.355
This study evaluated the bacterial concentrations and affecting factors at the laboratories of a university in Seoul, Korea. Thirty-three samples of total airborne bacteria (TAB) and eighteen samples of gram negative bacteria (GNB) were collected from both microbiology laboratories (7) and chemistry laboratories (6). GM (GSD) of TAB and GNB concentrations were 194 (2.52)
, 24 (4.1)
, respectively. TAB concentrations in the chemical laboratories (GM (GSD): 193 (2.0)
) were not significantly different from those in microbial laboratories (GM (GSD): 202 (2.7)
, (p>0.05)). GM (GSD) of TAB concentrationsat the top of sink, the center of laboratory, and the front of ventilation ventilation device within laboratories, 182 (3.2)
, 217 (2.2)
, 176 (2.4)
, respectively, were not significantly different (p=0.48). Related factors were measured such as temperature, relative humidity, floor of laboratory, number of persons and laboratory area. TAB concentrations were significantly related to temperature (r=0.36, p<0.05), and the floor of laboratory and temperature were also significantly related (r=0.49, p<0.001). However, other factors such as relative humidity, number of persons and laboratory area did not show any significant relationship with TAB concentrations (p>0.05). TAB concentrations were affected significantly by cleaning frequency (p<0.001) and floor of laboratory (p<0.05). There was also a significant difference (p<0.01) between TAB indoor concentrations and TAB outdoor concentrations. However, other factors such as general ventilation did not affect TAB concentrations (p>0.05) in this study.
Antibacterial effects of Mume Fructus Water Extract against Salmonella typhimurium in Murine Salmonellosis
Jung, Won-Chul ; Cha, Chun-Nam ; Lee, Hu-Jang ;
Korean Journal of Environmental Health Sciences, volume 35, issue 5, 2009, Pages 362~364
DOI : 10.5668/JEHS.2009.35.5.362
The present study was undertaken to estimate the antibacterial effect of Mume Fructus water extract (MFWE) against murine salmonellosis. At MFWE concentrations ranging from 25 to 100
, the antibacterial effect was not showed on Salmonella typhimurium (S. typhimurium). On the other hand, bacteria without MFWE had a tendency to proliferate up to 8 h after incubation. Oral administration of MFWE at the dose of 40 mg/ml showed a therapeutic effect for S. typhimurium infected BALB/c mice. The mortality of MFWE-treated mice was 80% at 12 days, while that of MFWE-untreated mice was 100% at 9 days after a lethal dose of S. typhimurium infection. The results of our study strongly indicate that MFWE has potential as an effective of salmonellosis.
A Study on the Application of Total Pollution Load Management System for Water Quality Improvement in Agriculture Reservoir
Oh, Dae-Min ; Lee, Young-Shin ;
Korean Journal of Environmental Health Sciences, volume 35, issue 5, 2009, Pages 365~375
DOI : 10.5668/JEHS.2009.35.5.365
Agriculture reservoirs need a systematic approach that can control water purity and water improvement. The area under study, Bunam Lake exceeds the agricultural water standard level due to contamination from the upper stream. When the Taean Enterprise City was planned, the water quality improvement plan was applied to minimize the environmental change. However, in order to continuously maintain the water quality in the Bunam Lake, it was essential to apply the Total Pollution Load Management System (TPLMs). In order to achieve the targeted water quality in the Bunam Lake, standard flow rates and targeted water quality levels were applied to obtain the loading capacity which is as follows : BOD 1,891.2 kg/d, T-N 1,945.7 kg/d, T-P 131.7 kg/d. Also, the regional development load was calculated as, BOD 1,083.6 kg/d, T-N 942.2 kg/d, T-P 61.8 kg/d, which is required to be deceased :- by BOD 378.4 kg/d, T-N 198.9 kg/d, T-P 31.6 kg/d in order to safely achieve the targeted water quality in the Bunam Lake.
Analysis of Sediment Nutrients as Potential Sources of the Lake Water Quality
Jung, Joon-Oh ; Kim, Young-Woo ;
Korean Journal of Environmental Health Sciences, volume 35, issue 5, 2009, Pages 376~385
DOI : 10.5668/JEHS.2009.35.5.376
The characteristics of Lake Cheonhoji water and sediment were investigated in oder to utilize these as fundamental materials for the management of lake water quality. The hydrographic properties of Lake Cheonhoji which are relatively low chance of nutrients loading from the watershed and a long retention time of lake water, lead to the probability of high lake productivity. It was also observed that lake water showed stratification during summer and complete mixing during fall, even though water depth was relatively shallow. The trophic state was eutrophic to hypertrophic from summer to late fall. The overall properties of the sediment were oligohumic, high ignition loss and high composition of NAIP and Resid.-P, which might serve as potential pollution sources of lake water quality. In laboratory scale experiments, it was observed that leaching potential of nutrients in the sediment was greatly dependant upon water temperature and dissolved oxygen. Finally, water pollution in Lake Cheonhoji was considered to be largely due to the adverse cycle of uncontrollable eutrophication, which resulted in the subsequent occurrence of dead algae and animal plankton, organic sedimentation, reduction of dissolved oxygen and nutrients leaching, which again reinforced the cycle of eutrophication in the lake.
A Comparison of Cotton Dust Concentrations Measured by Three Dust Samplers
Phee, Young-Gyu ; Kim, Hyun-Wook ; Byeon, Sang-Hoon ;
Korean Journal of Environmental Health Sciences, volume 35, issue 5, 2009, Pages 386~392
DOI : 10.5668/JEHS.2009.35.5.386
This study was undertaken to compare the performance of three dust samplers for collecting cotton dust fibers. For this study, three dust samplers including Vertical Elutriator (VE), Total Dust Method (TDM) using 37 mm cassette, and the Institute of Occupational Medicine (IOM) sampler were selected. A total of 6 cotton mills and 4 towel factories were investigated. When measured by VE, the GM for cotton dust was 0.19
which was less than the current occupational exposure limit (OEL) 0.2
. But when measured by TDM and IOM at the same locations, the GMs were 0.37 and 0.63
, respectively. In Korea, most industrial hygienists have used the TDM for cotton dust measurements and the results were compared with either the TLV for cotton dust or the PNOC (particulates not otherwise classified) of 10
for making decisions. The results of this study clearly showed that past cotton dust measurements and decisions made with such results were not correct. It needs to be noticed the related contents by using VE if it applies to the exposure limit, 0.2
, and needs to be revised the exposure limit by IOM. Also, if TDM is used, it requires to be studied and suggested to the new OEL.
Growth Optimization of Delftia sp. for the Odor Control of Organic Waste
Kwon, Hyuk-Ku ; Jung, Joon-Oh ; Chu, Duk-Sung ; Lee, Jang-Hoon ;
Korean Journal of Environmental Health Sciences, volume 35, issue 5, 2009, Pages 393~401
DOI : 10.5668/JEHS.2009.35.5.393
We isolated and identified a microorganism which was excellent for ammonia oxidation in the biological control of ammonia gas in odor producing materials from organic composting. The isolated strain was tested for growth characteristics and ammonia elimination efficiency under various conditions of temperature, pH, carbon concentration and ammonia concentration. The strain was isolated from a culture broth used in a
producing test with Griess-Ilosvay reagent. The results of 16S rRNA sequence from the isolated strain by using BLANST (Basic Local Alignment Search Tool) and confirming RDP (Ribosomal Database Project II) and ERRD (The European Ribosomal RNA Database) indicate that the strain is related to Delftia sp. UV-Spectrophotometer (Shimadzu, UVmini-1240) was used as a microbial growth test by measuring turbidity on OD660nm and ammonia concentration was measured by Spectrophotometer (HACH, DR-4000). The optimum growth culture conditions of the ammonia oxidizer Delftia sp. were
, pH 7, glucose concentration 1.00% and
0.5 g/l. Ammonia elimination efficiency was over 94% under the same conditions.
A Study on the Optimal Analytical Method for the Determination of Urinary Arsenic by Hydride Generation-Atomic Absorption Spectrometry
Lee, Jong-Wha ; Lee, Ui-Seon ; Hong, Sung-Chul ; Jang, Bong-Ki ;
Korean Journal of Environmental Health Sciences, volume 35, issue 5, 2009, Pages 402~410
DOI : 10.5668/JEHS.2009.35.5.402
This study was carried out to examine the optimal analytical method for determination of urinary toxic arsenic (inorganic arsenic and its metabolites) by HG-AAS (hydride generation-atomic absorption spectrometry). In the analysis of SRMs (standard reference materials), method E (addition of 0.4% L-cysteine to pre-reductant and use 0.04M HCl as carrier acid) showed the most accurate results compared with the reference values. In the analysis of 30 urinary samples, analytical results were significantly different depend on the component of pre-reductant and the concentration of carrier acid. When the concentration of carrier acid was higher, the analytical result was lower. The recovery rates of MMA (monomethylarsonic acid) and DMA (dimethylarsenic acid) were varied by the concentration of pre-treatment acid and carrier acid and hydride generation reagents. When the concentration of carrier acid was 1.62 M (5% HCl), the recovery rates of DMA was 1%. The recovery rates of MMA and DMA in method E (=V) were 102% and 100%, respectively. The results of this study suggest that the component and concentration of pre-reductant and carrier acid must be carefully adjusted in the analysis of urinary arsenic, and method E is recommendable as the most precise analytical method for determination of urinary toxic arsenic.
Improvement of Cooling Water Quality by Coagulation and Sedimentation in Steel Mill
Jo, Kwan-Hyung ; Woo, Dal-Sik ; Hwang, Byung-Gi ; Lee, Seon-Ju ; Park, Duck-Weon ;
Korean Journal of Environmental Health Sciences, volume 35, issue 5, 2009, Pages 411~416
DOI : 10.5668/JEHS.2009.35.5.411
This study was initiated to improve the cooling water quality by chemical coagulation and sedimentation in steel mills. Due to the inefficient flocculation in the settling tanks of blast furnace cooling water systems, the solid particles in the cooling water overflow accumulate and clog the cooling system. To protect the cooling water system from such fouling, proper flocculants must be continuously used. Laboratory tests were performed for the indirect cooling water system of a plate mill. The batch test in the gas scrubbing cooling water system of a blast furnace showed that the proposed coagulant was more effective for the improvement of coagulation and sedimentation than the existing one. During the tests, cationic flocculants were more effective than use of only an anionic flocculant. The suggested combination of anionic and cationic flocculants can probably improve the turbidity removal efficiency of the cooling water. Proper control of the overflow rate by the designed residence time would help turbidity removal efficiency in the settling tank. In addition, the settling can be enhanced by adopting rapid and slow mixing alternatively. Scale problems in blast furnace cooling water system were reduced to some extent by efficient settling.
The Whitening Effect of Angelicae dahuricae Radix Water Extract in Brown Guinea Pigs
Kim, Pil-Sun ; Kim, Young-Chul ;
Korean Journal of Environmental Health Sciences, volume 35, issue 5, 2009, Pages 417~425
DOI : 10.5668/JEHS.2009.35.5.417
The purpose of this study was to investigate the whitening effect of Angelicae dahuricae Radix water extract (ADWE) by its application on artificial tanning spots which were induced by 1,500
of UVB radiation on the backs of brown guinea pigs weighing approximately 450~500 g. Thirty
of ADWE, at each application, were applied twice a day, 5 days a week, for 8 weeks to the guinea pigs. The artificial tanning spots were divided into 3 groups which were vehicle control group [propylene glycol: ethanol: water (5:3:2)], positive control group (2% hydroquinone) and experimental group (2% ADWE). The visible whitening effect and changes in melanin index were evaluated once a week. On completion of the experiment, the animals were sacrificed under anesthetization, and the artificial tanning spots were excised by biopsy punch and stained with Hematoxylin and Eosin (H&E) to observe histological change and also stained with Fontana-Masson's silver (F-M) and S-100 to observe melanin pigmentation and melanocytes. In the gross observation, the experimental group showed higher pigmentation than the positive control group but lower pigmentation than the vehicle control group. Histological observation confirmed that ADWE had a positive whitening effect by showing a lower distribution of melanin and melanocytes in the epidermis of experimental group than in the vehicle control group.
Critical Issues on Health Risk of Asbestos
Yoon, Chung-Sik ;
Korean Journal of Environmental Health Sciences, volume 35, issue 5, 2009, Pages 426~432
DOI : 10.5668/JEHS.2009.35.5.426
Asbestos is a commercial term of natural occurring silicated minerals and forms long, thin fibers. Chrysotile, the serpentine asbestos, accounts for most use in commercial use. Asbestos is well known health hazard material and it is proved that inhalation of asbestos fibers leads to increased risk of developing several diseases such as lung cancer, mesothelioma, asbestosis. In these days, people most at risk for exposure are maintenance and construction workers and general citizens who are working on and close to the work area at which asbestos containing material is disturbing. Non asbestiform, though its chemical composition is same with regulated asbestos, is known to be less hazardous than asbestiform. Exposure guideline, 0.01 f/ml, is not safe level in terms of health risk. It is reasonable to take preventable action when asbestos is suspicious. In Korea, it is necessary to clarify the concept between hazard and risk, to differentiate asbestiform from non asbestiform, to make regulations for compensation for asbestos related patients, to manage future exposure for general citizens.