• Journal of Environmental Impact Assessment
• /
• v.25 no.6
• /
• pp.502-513
• /
• 2016

In this study, heavy metal distributions in the tissues of feral pigeon (Columba livia) were characterized using samples collected from bio-monitoring sites (Hangang Park and Hampyeong Park) of the NESB (National Environmental Specimen Bank), Korea, in order to evaluate the feasibility of feral pigeons as an indicator for the environmental monitoring. Cadmium (Cd) was analyzed to be accumulated in kidneys at higher concentration than in the other tissues. Such trend can also be found in the reviews on the Cd accumulations of the 34 cases including 17 avian species which showed that 31 cases had the highest Cd concentrations in the kidney among tissues. However, lead (Pb) was found to be richest in the bones in this study. 17 cases out of 30 reviewed cases had the highest Pb concentration in bones, whereas other 10 cases showed the highest concentration in kidneys, and 3 cases in livers. Therefore, kidneys together with bones can be a main target organ to test cadmium exposure to different habitat environments depending on physiological traits of birds. Zinc (Zn) was found to be the highest concentration in the pigeon livers of Hangang Park, but not in the bones. In contrast, the 13 cases of 16 reviewed cases had the highest Zn concentration in bones, and the 3 cases in livers. In addition, the heavy metal distribution patterns in relations to the metal accumulation mechanisms (a competition between Pb and Ca, a function of methallothionein protein, and etc.) were discussed.

• Korean Journal of Environmental Biology
• /
• v.27 no.4
• /
• pp.363-368
• /
• 2009

The Korean water deer (Hydropotes inermis argyropus) is an endemic species and one of the common species in Korea. The species ranges throughout the Korean peninsula and plays an important role as herbivores in natural ecosystem. Therefore, the species could be used as a good bio-indicator to monitor the quality of habitats. This study was to estimate the concentrations of five heavy metals (Fe, Cu, Zn, Cd and Pb) from three different organs (kidney, liver and spleen) in the Korean water deer. According to the analyses of heavy metal accumulations, the concentration of Fe is higher than Cu, Zn, Cd and Pb from all the organs. Among the organs, spleen (286.50) showed higher heavy metal concentrations than kidney (39.40) and liver ($23.21\;{\mu}g\;g^{-1}$). In general, the concentrations of the heavy metals were about two times higher in Cheorwon, Gangwon province than in the Eastern part of Jeonnam province. In particular, Cd and Pb showed a significant difference (P<0.05). Except for Fe in spleen, all of the heavy metal concentrations were below background levels.

• The Korean Journal of Malacology
• /
• v.22 no.1 s.35
• /
• pp.87-95
• /
• 2006

Immunohistochemical and ultrastuructural experiments were conducted to find out heavy metal accumulation in the intestine of an Antarctic gastropod Nacella concinna. According to the immune-histochemical experiment the apical cytoplasm of the intestinal epithelium showed positive reactions to anti-MT (rnotallothionein), indicating the presence of MT, a metal-binding protein involved in metal detoxifying process. In the transmission electron microscopic observations, the epithelial cells of the intestine exposed to Cd for over three hours showed irregular nuclear membranes, secretory granules, and probable metal granules. According to the SEM-EDS experiments on the intestine, concentration of Pb in the apical epithelium was in inverse proportion to that in the intestinal lumen. After exposing to Cd for over three days, S was rapidly reduced. Ca and Zn were rapidly increased after exposure to Cd. These elements are supposed to be concerned with the MT-reaction in the intestine. laken together, these data suggest that N. concinna could be used as a potential biomarker species.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
• /
• 1997.05a
• /
• pp.30-38
• /
• 1997

고속도로변에 설치된 retention pond는 drainage system의 일부분으로 우기에 빗물의 양을 조절하고 고속도로 노면에서 운반되어 retention pond에 유입된 오염된 입자를 침전, 제거시키기 위해 설치되었다. 빗물에 입자상태로 이동된 납, 아연, 카드뮴를 제거하기 위해 설치된 retention pond의 효과를 평가하기 위해 수리지질학적 연구 및 부유퇴적물의 물리화학적 특징을 규명하기 위한 연구가 수행되었다. 부유퇴적물과 비교하기 위해 심하게 오염된 roadside soil과 오염되지 않은 background soil에 대해서도 연구가 수행되었다. 부유퇴적물의 중금속함량은 background Sologne soil에 비해 원소에 따라 2-8배 높다. 그러나, roadside soil의 중금속함량은 부유퇴적물에 비해 7-26배 높다. Sequential extraction methods를 이용하여 분석한 결과 심하게 오염된 roadside soil에 존재하는 납, 아연, 카드뮴은 대부분 쉽게 용해될 수 있는 상태 (Fraction FII, FIII)로 존재하며 반면에 규산염광물과 수반되는 금속함량의 비율은 매우 낮다. 부유퇴적물에서는 규산염광물과 수반되는 금속함량이 전체 금속함량의 1/3까지 크게 증가한다. Roadside soil 과 부유퇴적물사이의 중금속함량 차이가 매우 큰 것은 중금속의 대부분이 retention pond에 이르기 전에 고속도로변과 배수로 일부에 축적되어 모두 상실하기 때문이다.

• Korean Journal of Food Science and Technology
• /
• v.34 no.6
• /
• pp.1140-1144
• /
• 2002

Molecular relaxation behaviors of crystalline glucose anhydrous, crystalline glucose monohydrate, and amorphous glucose with different particle sizes were observed by measuring spin-spin relaxation time constant $(T_2)$ at the temperature range of $-20\;to\;110^{\circ}C$ using temperature-controlled low field nuclear magnetic resonance spectroscopy. No change in $T_2$ values of crystalline glucose anhydrous was observed throughout the temperature range, whereas $T_2$ values of crystalline glucose monohydrate and amorphous glucose increased from around $45\;and\;65^{\circ}C$, respectively. These results indicate that molecular mobility of crystalline glucose anhydrous does not change even at temperature higher than $100^{\circ}C$ and that the stability of powdered glucose could be improved by increasing the particle size of materials.

• Korean Journal of Ecology and Environment
• /
• v.56 no.4
• /
• pp.320-329
• /
• 2023

Cadmium (Cd), a heavy metal found in the aquatic environment, accumulates in organisms through the food chain. In the study, we investigated the survival rates, measurement of body Cd levels, and expression analysis of the stress response genes (Heat shock protein 70: HSP70 and Heat shock protein 60: HSP60) and antioxidant enzyme Glutathione S-Transferases (GST) on benthic oligochaete worm Tubifex tubifex exposed three concentrations of Cd, to analyze the bioaccumulation and changes of stress gene expressions to exposure toxicity of the Cd-spiked sediment. Survival rates of T. tubifex exposed to the Cdspiked sediment were 93% at 0.4 mg kg^-1 Cd, 96% at 1.87 mg kg^-1 Cd, and 93% at 6.09 mg kg^-1 Cd for 10 days. Cd concentration in the body of T. tubifex was higher than that in the sediment. After Cd exposures for 10 days, the body Cd levels were 18.4 mg kg^-1, 13.06 mg kg^-1, and 79.11 mg kg^-1 at exposed three concentrations of Cd, respectively. Upregulation of HSP70 gene expression was observed at all concentrations of exposed Cd as a time-dependent manner, whereas transcriptional expression of the HSP60 gene increased as a timedependent manner in T. tubifex exposed to the relative high concentration (6.09 mg kg^-1) of Cd. However, GST gene expression increased on day 1 at all concentrations after Cd exposures, and then downregulated until 10 days. These results indicate to ecotoxicological and molecular effects in benthic oligochaete worm T. tubifex to Cd-spiked sediment and provide the basic information for the utilization of environmental toxicity assessment using the T. tubifex as a aquatic pollution indicator species.

• Journal of Environmental Health Sciences
• /
• v.26 no.3
• /
• pp.25-31
• /
• 2000

In order to assess the accumulation levels of cadmium and other metals(Zn, Cu, Ca and Fe) in fish bodies, an experimental study was performed by raising fry of "Oryzias latipes" in the water containing cadmium 0.03 ppm, cadmium 0.03 ppm + zinc 0.03 ppm and in the tap water(control group) were made. In the results the concentration of Cd in fish bodies were increased with advancing exposure time in Cd 0.03 ppm treated group and 0.03 ppm + Zn 0.03 ppm treated group, but there was no significantly different between both groups with Cd concentration in each week. The concentration of Zn in fish bodies was no changed with advancing exposure time in control group and Cd 0.03 ppm + Zn 0.03 ppm treated group were significantly different from control and Cd 0.03 ppm treated group. The concentration of Cu, Ca and Fe in fish bodies were increased with advancing exposure time, and control group was higher than any other groups. Simple correlation analysis showed that the positive correlation between Cd and Zn, Cu and Ca, Fe, Ca and Fe, but Cd was negative correlation with Cu, Ca and Fe. In conclusion, we investigated a tendency that the concentration of Cd and Zn in fish bodies tended to increase with the lapse of time, but Cu was unchanged and those of Ca and Fe were decreased in administrating the trace dose of Cd and Zn in water. in water.

• The Journal of Korean Medicine
• /
• v.22 no.1
• /
• pp.22-32
• /
• 2001

This study was conducted to investigate the antitoxic effects of Houttuynia cordata THUNB with chloroform and ethyl acetate fractions. The results were as follows: 1. Detoxication effects of chloroform and ethyl acetate fractions of Houttuynia cordata THUNB were increased in proportion to the dosages. Detoxication effects of ethyl acetate fraction of Houttuynia cordata THUNB were higher than chloroform fraction of Houttuynia cordata THUNB's results and detoxication effects in the kidneys were higher than results for the liver. 2. Metallothionein concentrations in the liver were higher than concentrations in the kidneys, and ethyl acetate fraction of Houttuynia cordata THUNB was higher than chloroform fraction of Houttuynia cordata THUNB in induction of metallothionein. 3. After the administration of chloroform and ethyl acetate fractions of Houttuynia cordata THUNB, body weights increased in proportion to chloroform and ethyl acetate fraction s dosage of Houttuynia cordata THUNB but changes of body weight dminished after 3 weeks. From the above results, this study suggests that chloroform and ethyl acetate fraction of Houttuynia cordata THUNB increased metallothionein induction to cadmium intoxication in rat s kidney and liver and decreased the toxicity of cadmium in rats.

• Journal of Chest Surgery
• /
• v.36 no.12
• /
• pp.929-936
• /
• 2003

We analysed the surgical outcomes of immediate reoperations after mitral valve repair. Material and Method: Eighteen patients who underwent immediate reoperation for failed mitral valve repair from April 1995 through July 2001 were reviewed retrospectively. There were 13 female patients. The mitral valve disease was regurgitation (MR) in 12 patients, stenosis (MS) in 3, and mixed lesion in 3. The etiologies of the valve disease were rheumatic in 9 patients, degenerative in 8, and endocarditis in 1. The causes of reoperation was residual MR in 13 patients, residual MS in 4, and rupture of left ventricle in 1. Fourteen patients had rerepair for residual mitral lesions (77.8%) and four underwent replacement. Result: There was no early death. After mean follow-vp of 33 months, there was one late death. Echocardiography revealed no or grade 1 of MR (64.3%) in 9 patients and no or mild MS in 11 patients (78,6%). Reoperation was done in one patient. The cumulative survival and freedom from valve-related reoperation at 6 years were 94% and 90%, respectively. The cumulative freedom from recurrent MR and MS at 4 years were 56% and 44%, respectively. Conclusion: This study suggests that immediate reoperation for failed mitral valve repair offers good early and intermediate survival, and mitral valve rerepair can be successfully performed in most of patients. However, because mitral rerepair have high failure rate, especially in rheumatic valve disease, adequate selections of valvuloplasty technique and indication are important to reduce the failure rate of mitral rerepair.

• Analytical Science and Technology
• /
• v.9 no.2
• /
• pp.134-138
• /
• 1996

Cadmium was transported through the special carrier system into the cells of cotyledons, hypocotyls, and roots spring radish young plants. The transport of cadmium was inhibited by metabolic inhibitor, like DNP. The $K_m$ values for cadmium were 0.7 ppm for cotyledons, 1.72 ppm for hypocotyls, and 0.3 ppm for roots, and $V_{max}$ for cadmium was $40ppm{\cdot}h^{-1}{\cdot}g{\cdot}fresh\;weight^{-1}$ for cotyledons, $313ppm{\cdot}h^{-1}{\cdot}g{\cdot}fresh\;weight^{-1}$ for hypocotyls, and $606ppm{\cdot}h^{-1}{\cdot}g{\cdot}fresh\;weight^{-1}$ for roots. Cadmium cannot prove to be inducer for proline accumulation. Therefore, proline accumulation cannot be used as a marker to test the level of heavy metal pollution.