• Journal of Nutrition and Health
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• v.35 no.4
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• pp.446-453
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• 2002

Effects of the two oriental medicinal prescriptions, Jahyulyangeuntang (JH) and Yanghyuljangeunkeonbohwan (YH), on intestinal calcium absorption were examined in the human colon carcinoma tell line, Caco-2 cells. Intestinal calcium absorption was evaluated at the level of Ca uptake into the cells across the brush border membranes, as well as at the level of net Ca transport (implying the amount of intestinal Ca transported into the blood stream). When the Caco-2 cells were incubated for 4, 8, 16 and 24 days post seeding, the cells were differentiated continuously, and showed progressively increased activities of Ca uptake (1.13 $\pm$ 0.04, 1.19 $\pm$ 0.02, 1.94 $\pm$ 0.03, and 2.40 $\pm$ 0.12 nmole.mg protein$^{-1}$ .30 min$^{-1}$ , respectively). Pretreatment of confluent Caco-2 cells with 50 $\mu\textrm{g}$/ml of YH for 24 hours resulted in a 30% increase in Ca uptake (p < 0.07), while pretreatment of the cells with the same concentration of JH for 6 hours resulted in a 24% increase (p < 0.05) in Ca uptake, compared to the value for the control cells (2.34 $\pm$ 0.10 nmole.mg protein$^{-1}$ .30 min$^{-1}$ ). When the cells were pretreated with varied concentrations (5-100 $\mu\textrm{g}$/ml) of the test samples for 6 hours, maximal increases in Ca uptake were observed in the cells pretreated with 100 $\mu\textrm{g}$/ml of YH (a 23% increase), and 50 $\mu\textrm{g}$/ml of JH (a 28% increase), respectively : however, no influence was seen on the net Ca transport activity. These results show that pretreatment with JH or YH, the two oriental medicinal prescriptions commonly used for improvement of bone metabolism, could possibly increase Ca accumulation inside the cells. but not the intestinal Ca net transport in vitro.

• Proceedings of the Korea Water Resources Association Conference
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• 2005.09b
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• pp.1189-1192
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• 2005

Due to their slow degradation properties, hydrophobic organic contaminants in estuarine sediment have been a concern for risks to human health and aquatic organisms. Studies of fate and transport of these contaminants in estuaries are further complicated by the fact that hydrodynamics and sediment transport processes in these regions are complex, involving processes with various temporal and spatial scales. In order to simulate and quantify long-term attenuation of Polycyclic Aromatic Hydrocarbons (PAH) in the Elizabeth River, VA, we develop a modeling approach, which employs the U.S. Environmental Protection Agency's water quality model, WASP, and encompasses key physical and chemical processes that govern long-term fate and transport of PAHs in the river. In this box-model configuration, freshwater inflows mix with ocean saline water and tidally averaged dispersion coefficients are obtained by calibration using measured salinity data. Sediment core field data is used to estimate the net deposition/erosion rate, treating only either the gross resuspension or deposition rate as the calibration parameter. Once calibrated, the model simulates fate and transport PAHs following the loading input to the river in 1967, nearly 4 decades ago. Sediment PAH concentrations are simulated over 1967-2022 and model results for Year 2002 are compared with field data measured at various locations of the river during that year. Sediment concentrations for Year 2012 and 2022 are also projected for various remedial actions. Since all the model parameters are based on empirical field data, model predictions should reflect responses based on the assumptions that have been governing the fate and sediment transport for the past decades.