排序方式: 共有34条查询结果,搜索用时 31 毫秒
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据世界卫生组织统计,每年世界上有1000万人患上癌症,而死于癌症的人数约6万,占全球死亡人数的12%。我国每年新增癌症患者180万,癌症的发病率呈急剧上升趋势。近20年来,胃癌一直是我国最多发肿瘤,新病例数基本保持了世界胃癌总数的1/3以上,而肝癌、食管癌的新病例数占全球发病数的一半或一半以上。其中胃、肝、食管、结直肠、口咽肿瘤居于我国多发肿瘤前几位。其实,在厨房里有很多抗癌食物,只要善于利用,在一定程度上可以达到抗癌 相似文献
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近日,德国波恩大学的弗罗曼教授发现,古埃及哈特谢普苏特女王装护肤品的瓶子中含有一种致癌物质:焦油残渣。由此引发了考古学界的一个巨大疑问,也引起了争议纷纭:难道古埃及的“武则天”——哈特谢普苏特女王——是死于护肤品中毒吗?历史的真相到底是怎么样的甲 相似文献
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WU Yu-qiong WANG Chong-gang WANG Yun ZHAO Yang CHEN Yi-xin ZUO Zheng-hong 《环境科学学报(英文版)》2007,19(9):1129-1135
It has been reported that there is an interaction between Benzo[a]pyrene (BaP), a widespread carcinogenic polycyclic aromatic hydrocarbon, and tributyltin (TBT), an organometal used as an antifouling biocide. This study was therefore designed to examine the potential in vivo influence of BaP, TBT and their mixture on splenic antioxidant defense systems of Sebastiscus marmoratus. The fish were exposed to water containing environmentally relevant concentrations of BaP, TBT and their mixture. Spleens were collected for biochemical analysis after exposure for 7, 25, 50 d and after recovery for 7, 20 d. Cotreatment with BaP and TBT for 7 d potentiated the induction of glutathione peroxidase (GPx) activity by BaP or TBT alone. The cotreatment for 25 and 50 d resulted in inhibition of GPx activity, which was similar to the effect of TBT. Splenic glutathione S-transferase (GST) activities were significantly elevated in S. marmoratus exposed to BaP starting from 7 d and remained high up to 25 d. However, no further activity change was found with prolonged exposure. Cotreatment of BaP and TBT primarily inhibited the GST activity, which was similar to the effect of TBT. Cotreatment with BaP and TBT for 25 or 50 d potentiated the depletion of GSH (glutathione) by BaP or TBT alone. MDA (malondialdehyde) contents in spleen of S. marmoratus were not significantly altered compared with the control during the test period. Spleen, as an immune organ, is sensitive to exposure of BaP or TBT. It should have an effective mechanism to counteract oxidative damage. Antioxidative defense systems in spleen of S. marmoratus should be considered as potential biomarkers. Short-term exposure of BaP or TBT could result in induction of antioxidant defense system. A significant decrease of these indices, such as GSH, GST, GPx might indicate more severe contamination. 相似文献
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论述了空气危险污染物对环境特别对人体的危害,并建议建立危险空气污染物国家标准目录,逐步开展对其监测工作。 相似文献
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张济宁 《石油化工环境保护》2003,26(2):27-27
大气悬浮粒状物质中的许多多环芳烃 ( PAH)都是强烈致癌物质 ,如 :苯并 [α]芘等。特别是 3~4个环的多环芳烃 ( PAH)具有半挥发性。因此 ,用装有石英纤维滤纸的高容量采气器捕集大气悬浮粒状物质。然后将石英纤维滤纸置于索氏萃取器中 ,加入二氯甲烷后萃取或用超声波洗涤器萃取 ,最后用气相色谱 /质谱法 ( GC/ MS)测定大气悬浮粒状物质中的多环芳烃的测定@张济宇 相似文献