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RISS 인기검색어
- 검색키워드
- 저자 : WU Zhong-qun (검색결과 2 건)
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The Operational Risks of Electricity Futures Based on Non-Storability of Electric Power
WU Zhong-qun 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
Electricity futures emerged in 1990"s, and it was expected to bring electricity market efficiency and stability. However, the practice on electricity futures show that it can not efficiently prevent the fluctuation of market price, and eve the electricity futures market may go to collapse. Up to now, none of literatures clears the question. This paper gives the causes that lead up to the failure of electricity futures market by analyzing the internal interaction mechanism between electricity futures price and spot prices. First, electric power is not economically storable, as a result electricity futures exchange can not at all make an influence to electricity spot prices through inventory change; second, traders always modify the quotation on the basis of expectation about the state of electricity market in the future, so the expectation plays an important role for the prices of futures contracts. The paper concludes that the failure of electricity futures market can fundamentally be attribute to two reason: (1) non-storage of electric power, i.e. that electricity futures market inevitably goes to collapse if only the electricity can not be stored economically; (2) the instability of expectation, which will directly cause the fluctuation of prices in electricity market.
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Expression and Functional Role of ALDH1 in Cervical Carcinoma Cells
Rao, Qun-Xian,Yao, Ting-Ting,Zhang, Bing-Zhong,Lin, Rong-Chun,Chen, Zhi-Liao,Zhou, Hui,Wang, Li-Juan,Lu, Huai-Wu,Chen, Qin,Di, Na,Lin, Zhong-Qiu Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.4
Tumor formation and growth is dictated by a very small number of tumor cells, called cancer stem cells, which are capable of self-renewal. The genesis of cancer stem cells and their resistance to conventional chemotherapy and radiotherapy via mechanisms such as multidrug resistance, quiescence, enhanced DNA repair abilities and anti-apoptotic mechanisms, make it imperative to develop methods to identify and use these cells as diagnostic or therapeutic targets. Aldehyde dehydrogenase 1 (ALDH1) is used as a cancer stem cell marker. In this study, we evaluated ALDH1 expression in CaSki, HeLa and SiHa cervical cancer cells using the Aldefluor method to isolate ALDH1-positive cells. We showed that higher ALDH1 expression correlated with significantly higher rates of cell proliferation, microsphere formation and migration. We also could demonstrate that SiHa-ALDH1-positive cells were significantly more tumorigenic compared to SiHa-ALDH1-negative cells. Similarly, SiHa cells overexpressing ALDH1 were significantly more tumorigenic and showed higher rates of cell proliferation and migration compared to SiHa cells where ALDH1 expression was knocked down using a lentivirus vector. Our data suggested that ALDH1 is a marker of cervical cancer stem cells and expand our understanding of its functional role.
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