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| Long-term carcinogenicity studies are conducted to evaluate the carcinogenic risk of xenobiotics by comparing the incidences of neoplastic and pre-neoplastic lesions in laboratory animals observed in the dose groups with those in the concurrent control. |
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tanghuai
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2Â¥2009-06-26 00:17:35
weichang
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prince_of_persia
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Õâ¸ö´ÊÓжà¸öÒâ˼£¬ ÎÒ²éÁËÏ£¬¾õµÃ¡°ÉúÎïÌ塱Õâ¸öÒâ˼½ÏºÃ 1.Studies showed that xenobiotics could induce bladder cancer,but its mechanism was still not so clear. ÓÐÑо¿±íÃ÷ÍâÀ´»¯ºÏÎï¿ÉÓÕ·¢°òë×°© ,µ«Æä»úÖÆÉв»Çå³þ¡£ 2.Xenobiotics metabolism enzymes include Phase¢ñenzymes such as Cytochromes P450(CYP450) and Phase ¢òenzymes such as Glutathione S-Transferase (GSTs) and N-acetyltransferase (NATs). ÉúÎïÌåÄڵĴúлø°üÀ¨¢ñÏà´úлøÈçϸ°ûÉ«ËØP450ͬ¹¤Ã¸Ïµ£¨Cytochromes P450,CYP450£©ºÍ¢òÏà´úлø¹Èë׸ÊëÄÁò×ªÒÆÃ¸£¨Glutathione S-Transferases,GSTs£©ºÍN-ÒÒõ£×ªÒÆÃ¸£¨N-acetyltransferases,NATs£©µÈ¡£ 3.It is thought that extracellular GSH protects the cells from oxidants released by inflammatory cells whilst intracellular GSH neutralizes the ROS produced as a result of normal cell metabolism, as well as detoxifying xenobiotics(4). Ñо¿ÕßÈÏΪϸ°ûÍâµÄ¹Èë׸ÊëĿɱ£»§Ï¸°ûÃâÊÜ·¢Ñ×ϸ°ûËùÊÍ·ÅÑõ»¯¼ÁµÄ¹¥»÷£¬¶øÏ¸°ûÄڵĹÈë׸ÊëÄ¿ÉÖкÍÕý³£Ï¸°û´úл×÷ÓÃÒÔ¼°¹²ÆÜÉúÎï½â¶¾×÷ÓÃËù²úÉúµÄ¾ß·´Ó¦ÐÔÑõºËËØ¡£ |

3Â¥2009-06-26 00:17:38
monitor2885
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4Â¥2009-06-26 08:24:53
wanglu3353
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5Â¥2009-06-26 08:43:21
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6Â¥2009-06-26 08:58:06
medicine1031
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(¾ßÓÐÉúÀí»îÐÔµÄ)ÌåÄÚ¹²ÆÜÉúÎï 1. ÉúÎïÒìÔ´ÎïÖÊ ·Ö×ÓÉúÎïѧ´Ê»ã£¨x£© ... xenogamy|ÒìÖêÊܾ« xenograft|ÒìÖÖÒÆÖ² xenopsin|צó¸ëÄ ... www.soenglish.com.cn- »ùÓÚ159¸öÍøÒ³ 2. ÍâÔ´Îï ½ø³ö¿ÚרҵӢÓï´Ê»ã(X-Z) ... xenon flash tube ë¯ÉÁ¹â¹Ü xenon high-pressure lamp ¸ßÑ¹ë¯µÆ xenon infrared search-light 믺ìÍâ̽ÕÕµÆ ... www.yilifood.com- »ùÓÚ54¸öÍøÒ³ 3. ÎïÖÊ µ±ÍâÔ´ÐÔÎïÖÊ£¨Xenobiotics£©£¬ÈçÒ©ÎʳƷ¡¢¶¾ÎïµÈ½øÈëÌåÄÚºó£¬ÄÚÔ´ÐÔÎïÖÊÔÚÌåÄڵĺ¬Á¿±ã»á·¢Éú±ä»¯»ò³öÏÖÒì³££¬Ìáʾ»úÌå·¢ÉúÁ˲¡±ä¡£ 33ge.com- »ùÓÚ22¸öÍøÒ³ 4. »¯ºÏÎï ÍâÔ´ÐÔ»¯ºÏÎXenobiotics£© ÊÇÈËÀàÉú»îµÄÍâ½ç»·¾³ÖдæÔÚ¡¢¿ÉÄÜÓë»úÌå½Ó´¥²¢½øÈë»úÌåµÄһЩ»¯Ñ§ÎïÖÊ£»ËüÃÇ·ÇÈËÌåµÄ×é³É³É·Ö£¬Ò²·ÇÈËÌåËùÐèµÄÓªÑø... |
7Â¥2009-06-26 08:58:19
richway1222
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richway
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8Â¥2009-06-27 18:10:31
vitamine
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