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Possibilities and limitations in cancer prevention 总被引:1,自引:0,他引:1
Dietrich Schmähl 《Die Naturwissenschaften》1988,75(7):334-340
The possibilities and limitations in cancer prevention are shown by means of some examples and historical facts. A necessary prerequisite for effective prevention is to know the exact cause of cancer. This is known for some tumor types (e.g., bronchial cancer), while for others it is hardly known (e.g., breast cancer). There are many factors which influence the whole process of carcinogenesis. Exposure to environmental pollutants in a wide sense represents only one of many possible etiologies. This has to be taken into consideration. 相似文献
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Andrea M. Dietrich Daniel L. Gallagher Kathryn A. Klawiter 《Journal of the American Water Resources Association》2001,37(2):281-293
ABSTRACT: Inputs of copper‐based crop protectants from tomato fields grown under plastic mulch agriculture (plasticulture) to an estuarine creek were investigated. Copper was measured in runoff from diverse land‐uses including conventional agriculture, plasticulture, residences, and natural areas. Water column and sediment copper concentrations were measured in plasticulture and control (nonagriculture) watersheds. Copper concentrations in plasticulture‐impacted creeks exceeded background levels episodically. High concentrations occurred during or immediately after runoff‐producing rains. Concentrations of 263 μg/L total copper and 126 μg/L dissolved copper were measured in a tidal creek affected by plasticulture; concentrations exceeded the shellfish LC50 values and the water quality criteria of 2.9 μg/L dissolved copper. Control watersheds indicated background water column levels of ≤ 4 μg/L dissolved copper with similar copper levels during periods with and without rain. The copper concentrations in tomato plasticulture field runoff itself contained up to 238 μg/L dissolved copper. Copper concentrations in runoff from other land‐uses were less than 5 μg/L dissolved copper. Creek sediment samples adjacent to a plasticulture field contained significantly higher copper concentrations than sediments taken from nonplasticulture watersheds. 相似文献
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