化工废水对鱼的一致性及灵敏度的响应

运用不同鱼种的急性毒性试验对东北三省具有代表性的化工行业中五种企业污染源排放口水样进行监测,按照工业废水试验方法（鱼类的急性毒性测试）研究了化工废水对于敏感鱼毒性效应。研究结果表明：化工行业废水对不同鱼种均有一定的毒性,随着实际废水暴露浓度的增加,鱼死亡率呈明显的上升趋势,且呈现一定的梯度。同一浓度不同企业的水样,鱼的存活率不同,但有一定的抑制现象。在选取的化工行业中,以不同鱼种作为受试生物的生物毒性大小排序为：吉化1〉吉化2〉吉化3〉吉化4〉吉化5。     

Extreme phase sensitivity of afferents which innervate mormyromast electroreceptors

The Science of Nature -     

绿色通讯:现代通讯的方向性标志

在这个高度信息化的时代，通讯已经深入到了社会、生活的许多方面，而且正逐渐成中的重要元素影响或操纵着我们的生活。可以说有人的地方就有通讯网络的覆盖，因为我们每天都已经无法离开通讯了。就通讯的发展而言．它经过了一个漫长的过程．从秦时的烽火狼烟到今天的移动通讯技术，通讯以一种不可思议的角度切入到了我们的生活中并以一种你无法拒绝的方式正在改变着我们的生活。     

Study on the sensitivity to cadmium of marine fish Salaria basilisca（Pisces： Blennidae）

The present study tested the sensitivity of Salaria basilisca to water-cadmium (Cd) contamination. For this purpose, liver somatic index (LSI), Cd concentrations and the activities of antioxidant enzymes such as catalase (CAT), superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) were measured in the liver of S. basilisca exposed to Cd-contaminated water (2 mg Cd/L as CdCl2) for 14 and 28 d. The results showed that the LSI decreased significantly after 14 and 28 d of Cd-exposure. Cd bioaccumulation in the liver resulted in an increasing uptake up to 42 g/g dry weight after 28 d of exposure. Activities of CAT and SOD were significantly increased with increasing exposure time. A significant increase in GSH-Px activity, under Cd influence, was observed during 14-day exposure period (p < 0.0001). However, a significant decrease (p < 0.05) in this activity with respect to control fish was registered after 28 d of Cd-exposure. These results showed that Cd accumulation in the liver of S. basilisca could induce oxidative stress as demonstrated by changes in the antioxidant enzyme activities. Results also emphasized that S. basilisca may considered as a sensitive species to Cd exposure.     

The spectral sensitivity of a passerine bird is highest in the UV

The work was supported by a grant from the DFG, SFB 4, E6.