| 石油烃、Cu2+对沙蚕的毒性效应及对其抗氧化酶系统的影响 |
| 摘要点击 2504 全文点击 1756 投稿时间：2005-08-20 修订日期：2005-10-21 |
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| 中文关键词 沙蚕(Nereis diversicolor) 抗氧化酶系统 毒性效应 过氧化物酶(POD) 超氧化物歧化酶(SOD) |
| 英文关键词 polychaete(Nereis diversicolor) antioxidant enzyme system toxic effect peroxidase(POD) superoxide dismutase(SOD) |
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| 中文摘要 |
| 在实验室模拟条件下,研究了石油烃和不同浓度的Cu2+对沙蚕(Nereis diversicolor)种群的毒性效应及对其抗氧化酶系统活性的影响.结果表明:石油烃和Cu2+对沙蚕均表现出较强的毒性,暴露3d后,其LD50值分别为117.5μL·L-1和864.0μg·L-1.Cu2+单因子污染暴露5d后,沙蚕体内过氧化物酶(POD)的活性受到显著影响,表现出先受到抑制后缓慢增加的趋势,超氧化物歧化酶(SOD)的活性也发生显著变化,其变化趋势为先被诱导而后抑制.石油烃以其约为半致死剂量水平单因子暴露5d后,POD的活性并未被显著诱导,SOD的活性则低于对照组.在石油烃与Cu2+复合污染的条件下,暴露5d后沙蚕体内POD和SOD活性表现出相同的变化趋势,即先下降后上升.通过比较,还发现沙蚕体内SOD的活性变化更能灵敏地反映出污染物对沙蚕的毒性作用. |
| 英文摘要 |
| Under the condition of the laboratory simulation,the toxic effects of petroleum hydrocarbons and various concentrations of copper(Cu2+) on the polychaete Nereis diversicolor and on its antioxidant enzyme defense systems were examined.The results indicate that both petroleum hydrocarbons and Cu2+ have high toxicity to the polychaete.After a 3-day exposure to petroleum hydrocarbons and Cu2+,the value of LD50 was 117.5(μL·L-1) and 864.0(μg·L-1),respectively.The activities of peroxidase(POD) and superoxide dismutase(SOD) were influenced significantly through a 5-day exposure to single pollution of Cu2+.The activity of POD was inhibited at first and then enhanced gradually;on the contrary,the activity of SOD showed a tendency of induction firstly and then inhibition.After exposed to petroleum hydrocarbons at the concentration of the value of LD50 for 5 days,POD activity of the polychaete was not significantly induced,and the activity of SOD was lower than that of control.A 5-day exposure to the joint-pollution of petroleum hydrocarbons and Cu2+ could bring out a decrease in the activities of POD and SOD firstly and then an increase.The changes in the activity of SOD can better reflect the toxic effects of pollutants on the polychaete. |
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