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Kim A.D.,Jeju National University | Zhang R.,Jeju National University | Kang K.A.,Korea Institute of Radiological and Medical Sciences | You H.J.,Chosun University | And 2 more authors.
Biological Trace Element Research | Year: 2012

Vanadium compounds have shown promise in the treatment of diabetes and in cancer prevention. The aim of this study is to investigate the effects of Jeju ground water, containing the vanadium compounds S1 (8.0 ± 0.9 μg/l) and S3 (26.0 ± 2.0 μg/l), and of vanadyl sulfate (VOSO 4, 26 μg/l) on antioxidant systems in human Chang liver cells. Cells were incubated for ten passages in media containing deionized distilled water, Jeju ground water (S1, S3), or VOSO 4. S1 and S3 increased the gene and protein expression and the enzymatic activities of antioxidant enzymes, including superoxide dismutase, catalase, glutathione peroxidase, and heme oxygenase. VOSO 4 was likewise found to improve mRNA and protein expression as well as the activities of these enzymes. Taken together, these results suggest that the antioxidant properties of Jeju ground water, containing vanadium compounds, and of vanadyl sulfate were due to stimulatory effects on antioxidant enzyme activities and antioxidant enzyme expression. © 2011 Springer Science+Business Media, LLC. Source

Mair A.,University of Hawaii at Manoa | Mair A.,U.S. Geological Survey | Hagedorn B.,California State University, Long Beach | Tillery S.,International Boundary and Water Commission | And 4 more authors.
Journal of Hydrology | Year: 2013

Estimates of groundwater recharge spatial and temporal variability are essential inputs to groundwater flow models that are used to test groundwater availability under different management and climate conditions. In this study, a soil water balance analysis was conducted to estimate groundwater recharge on the island of Jeju, Korea, for baseline, drought, and climate-land use change scenarios. The Soil Water Balance (SWB) computer code was used to compute groundwater recharge and other water balance components at a daily time step using a 100m grid cell size for an 18-year baseline scenario (1992-2009). A 10-year drought scenario was selected from historical precipitation trends (1961-2009), while the climate-land use change scenario was developed using late 21st century climate projections and a change in urban land use. Mean annual recharge under the baseline, drought, and climate-land use scenarios was estimated at 884, 591, and 788mm, respectively. Under the baseline scenario, mean annual recharge was within the range of previous estimates (825-959mm) and only slightly lower than the mean of 902mm. As a fraction of mean annual rainfall, mean annual recharge was computed as only 42% and less than previous estimates of 44-48%. The maximum historical reported annual pumping rate of 241×106m3 equates to 15% of baseline recharge, which is within the range of 14-16% computed from earlier studies. The model does not include a mechanism to account for additional sources of groundwater recharge, such as fog drip, irrigation, and artificial recharge, and may also overestimate evapotranspiration losses. Consequently, the results presented in this study represent a conservative estimate of total recharge. © 2013 . Source

Jeong D.,Chungnam National University | Yu Y.,Chungnam National University | Liu Q.,CAS Institute of Geology and Geophysics | Jiang Z.,CAS Institute of Geology and Geophysics | And 2 more authors.
Geochemistry, Geophysics, Geosystems | Year: 2014

A composite of 28 trachytic lava flows were recovered from the Jeju Geopark Drilling Project (JGDP) in Jeju Geopark, one of the new seven wonders of Nature declared by UNESCO in 2011. Each trachytic lava flow has a tendency to increase in magnetic grain size from the rapidly cooled brecciated margin and vesicle streaked zone downward into the massive crystalline flow interiors. The brecciated margin and vesicle streaked zone of individual trachytic lava flow contains exclusively fine-grained magnetite as inclusions in plagioclase. High-fidelity paleointensity determinations were obtained from 26 (out of 224 examined) samples from JGDP cores. Temporal variation of virtual axial dipole moments (VADMs) calculated from the absolute paleointensity estimates follows the trend of sint-800 data for the interval from ∼80 to ∼360 ka. High VADM from flow 21 possibly represents real intensity peak, as previously recognized high VADM in Japan at ∼336 ka, in Trans-Mexican volcanism ∼339, and in Hawaii ∼340-350 ka. Perhaps such a strong magnetic intensity near ∼325-350 ka might be smoothed out in relative paleointensity records. Key Points A composite of 28 trachytic lava flows were recovered in Jeju Geopark Brecciated margin and vesicle streaked zone contains fine-grained Fe-oxide High strength geomagnetic field intensity appears at ~325-350 ka ©2013. American Geophysical Union. All Rights Reserved. Source

Senevirathne M.,Chonnam National University | Kim S.-H.,Jeju National University | Kim Y.-D.,Jeju Special Self Governing Province Development Corporation | Oh C.-K.,South Tourism | And 5 more authors.
Journal of Food Engineering | Year: 2010

In this study, far-infrared radiation (FIR) drying was used to convert wet citrus press-cakes (CPCs) into dried form at different temperatures (40, 50, 60, 70, and 80 °C). The dried samples were evaluated for flavonoid composition by HPLC and antioxidant activities by various in vitro assays. Compared with CPCs prepared by freeze drying (FD), all FIR-dried CPCs showed slightly lower extraction yield and total phenolic content, but almost equal total flavonoid contents and antioxidant activities. However, CPCs dried by FIR showed significantly lower drying times. Therefore, FIR drying is effective and economical method. CPCs dried by FIR at 80 °C showed higher antioxidant activities in several assays, and needed very short drying time. Hence, FIR-80 sample was more potential than other FIR-dried samples. The data confirmed that FIR drying is an effective process to convert wet CPCs into dried form which shows strong antioxidant activities. © 2009 Elsevier Ltd. All rights reserved. Source

Jeju Special Self Governing Province Development Corporation | Date: 2012-05-03

Beer; Extracts of hops for making beer; Lager beers; Malt beer; Malt wort; Beer wort; Stout; Ale; Synthetic beer; Dark beer. Alcoholic essences; Alcoholic extracts; Brandy; Whisky; Wine. Wholesale services for alcoholic beverages; Retail services for alcoholic beverages; Commercial intermediary services in the field of alcoholic beverages; Sales arranging of alcoholic beverages; Wholesale services for alcoholic beer; Retail services for beer; Commercial intermediary services in the field of beer; Sales arranging of beer.

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