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排序方式: 共有75条查询结果,搜索用时 15 毫秒
1.
An array of alternating anion and cation exchange membranes can be used to generate electric power from the free energy of mixing of river and sea waters. A simple mathematical model, which predicts experimental results well, is useful in exploring conditions for optimization of the process. Major, but not impossible, improvements in technology would be required to bring the cost of power from the dialytic battery into line with foreseeable energy prices. 相似文献
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Oncogene-induced transformation of C3H 10T1/2 cells is enhanced by tumor promoters 总被引:12,自引:0,他引:12
The tumor promoters 12-O-tetradecanoyl-phorbol-13-acetate and teleocidin markedly enhanced the transformation of C3H 10T1/2 mouse fibroblasts when these cells were transfected with the cloned human bladder cancer c-rasH oncogene. Transfection studies with the drug resistance marker gpt and time course studies indicate that this enhancement is not simply an effect on the process of DNA transfection. These findings, together with parallel studies with NIH 3T3 fibroblasts, also indicate that the competence of animal cells for DNA transfection is a function of the recipient cell line, the transfected marker, and the growth conditions. Our findings suggest that during multistage carcinogenesis tumor promoters may complement the function of activated cellular oncogenes. 相似文献
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Cost-effective priorities for cancer prevention 总被引:1,自引:0,他引:1
M C Weinstein 《Science (New York, N.Y.)》1983,221(4605):17-23
Faced with limited resources, the United States must set priorities for research to identify preventable causes of cancer. A quantitative approach to priority setting, based on principles of decision analysis and cost-effectiveness analysis, can offer guidance in this process. An illustrative application of such a model suggests that the National Institutes of Health-supported clinical trial of dietary beta-carotene offers a greater expected reduction in cancer mortality per research dollar than carcinogen bioassays of high-volume industrial chemicals such as p-dichlorobenzene. National research priorities should reflect the relative cost-effectiveness of such investments. 相似文献
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Mitogenesis is only one factor in carcinogenesis 总被引:7,自引:0,他引:7
I B Weinstein 《Science (New York, N.Y.)》1991,251(4992):387-388
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Schwarz D Klein L Weinstein S Rabaut S Murtaugh B Smith T 《Journal of the American Veterinary Medical Association》2008,233(7):1053; author reply 1053-1053; author reply 1054