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- 저자 : Odum, (검색결과 4 건)
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Emergy Analysis Overview of Korea
Lee, Suk Mo,Odum, Howard T. 한국환경과학회 1994 한국환경과학회지 Vol.3 No.2
An emergy analysis of the main energy flows driving the economy of humans and life support systems was made including environmental energies, fuels, and imports, all expressed as solar emjoules. The total emergy use (4,373 E20 sej/yr) is 90 per cent from imported sources, fuels and goods and services. The emergy flows from the environment are modest, because the share of global inputs such as rain and geological uplift flux is modest. Consequently, the ratio of outside investment to attracting natural resources is already large, like other industrialized countries. The population level is already in excess of carrying capacity. The emergy use per person in Korea indicates a moderate emergy standard of living, even though the indigenous resource is very poor. If the present economy were running entirely on stored reserves of fuels, soils, woods, etc., it would last about 2 years. Its carrying capacity for steady state on its renewable sources is only 3.3 million people, compared to 43.3 million in 1991. Continued availability of foreign oil at a favorable balance of emergy trade, currently about 7 to 1 net emergy, is the basis for present economic activity and must decrease as the net emergy of foreign oil purchased goes down. Close economic integration with Middle East may determine how long this is possible in the future.
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The impact of plasma zinc status on the severity of prostate cancer disease
Victor C. Wakwe,Ehimen. P. Odum,Collins Amadi 대한비뇨의학회 2019 Investigative and Clinical Urology Vol.60 No.3
Purpose: The severity of prostate cancer (PCa), which determines the disease progression, is theorized to be a function of zinc status. Hence, this study was structured to determine the impact of zinc status on the severity and progression of PCa disease. Materials and Methods: This was a descriptive cross-sectional study of 220 histologically-confirmed PCa patients and 220 age-matched controls, conducted prospectively in a Nigerian tertiary hospital. Plasma zinc, prostate-specific antigen, creatinine, fasting glucose, and estimated glomerular filtration rate were determined for both study groups. The International Society of Urological Pathology (ISUP) grades and the American Joint Committee on Cancer clinical staging were employed as indices for PCa severity (grade) and progression (stage) respectively. Results: The PCa patients had markedly reduced plasma zinc status compared to controls (cases: 9.42±3.02 µmol/L versus controls: 15.23±4.47 µmol/L; p<0.001). Low zinc status was more pronounced within the severe grade and advanced PCa disease subgroups (p<0.001). Inverse relationships existed between zinc status and ISUP grades among the entire PCa patient (p<0.001) and the categorized PCa grade and stage subgroups (p<0.001). Low zinc status had significant impact of predicting severe (crude=odds ratio [OR], 8.714; p<0.001; age-adjusted=OR, 11.152; p<0.001) and advanced (crude=OR, 17.160; p<0.001; age-adjusted=OR, 18.927; p<0.001) PCa disease. Conclusions: This study suggests that low plasma zinc status is associated with severe grade and advanced PCa disease. However, further well-designed studies with large sample sizes are warranted to confirm these associations.
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