模拟纳污水体底质参数变化

本文介绍了模拟纳污水体中ＷＡＲ，ＷＭＲ，ＷＣＨ，ＳＡＲ，ＳＭＲ，ＳＳＦ和ＲＯＣ的变化。过程曲线表明水体污染时底质参数出现累积现象。     

印楝素对亚洲玉米螟的生物活性及蛋白质合成的影响

室内生物测定表明,印楝素对玉米螟幼虫具有明显的毒杀作用和抑制生长发育的活性.浓度3×10-6 ~15×10-6印楝素处理幼虫,均出现活动性降低、化蛹延迟、蛹出现畸形的现象,甚至形成永久性幼虫,且与处理浓度有一定的相关性.同时发现,经印楝素处理后,亚洲玉米螟48h蛹蛋白质的含量和组分与对照相比出现明显的差异,含量与处理浓度有较好的相关性.SDS-PAGE结果显示, 经3×10-6 ~15×10-6印楝素处理,昆虫的蛹均出现分子量Mr55×103、50×103两种新蛋白组分,减少了21. 6×103、20×103两种蛋白组分;另外10×10-6和15×10-6印楝素处理还减少了22×103蛋白组分, 15×10-6处理还出现9×103新蛋白组分; 这6种差异蛋白可能是印楝素分子作用的相关蛋白. 图2表1参20     

现代生物技术在废水处理中的应用进展

介绍了现代生物技术及其在废水处理中的应用和发展 ,讨论了现代生物技术和环境工程技术相结合的环境生物技术的应用及其发展趋势     

富营养化淡水水体中微囊藻毒素的研究进展

微囊藻毒素（Microcystins,MCYSTs,MCs）为富营养化淡水水体中最常见的藻类毒素,从毒理学、环境科学、生物学及化学等方面对MCs的研究已有较多报道。本文综述了关于MCS在产生机理、毒理效应、分离检测方法和水处理过程中的去除方法等方面的研究进展,并对目前研究的不足提出了几点意见。     

生物絮凝剂除浊脱色作用的初步研究

本文报道了产生ＮＡＴ型生物絮凝剂的菌株的培养方法和筛选结果，着重讨论了此类生物絮凝剂对染料水样和非染料水样进行处理过程中ｐＨ值对处理效果的影响。并利用开发出的生物絮凝剂对实际排污河水进行处理，证明生物絮凝剂对悬浮水体的处理效果较好，可用于去除藻类。     

Bioaccumulation of lanthanum and cerium and their effects on the growth of wheat (Triticum aestivum L.) seedlings

Through short-term exposure (7-d exposure), long-term exposure (16-d exposure) and exposure-recovery (7-d exposure + 9-d recovery), the bioaccumulation and distribution of La and Ce and their effects on growth of wheat seedlings were studied. Addition of La (0.5-25 mg/l) and Ce (0.5-25 mg/l) to the culture medium individually and in combination inhibited primary root elongation, reduced the dry weight of roots and shoots and the content of mineral elements (Ca, Mg, K, Cu, Zn). The damage increased with an increase in the concentrations of La and Ce in culture medium. Relative damage ratio increased with an increase in concentrations of La and Ce in the culture medium and with exposure time. Comparing exposure-recovery groups with long-term exposure groups, primary root lengths, dry weight of roots and shoots and the content of five mineral elements were higher. The accumulation of La and Ce in the seedlings was positively correlated with the concentrations of La and Ce in the culture medium and with exposure time. Bioaccumulation factors of La and Ce in roots were much higher than those of shoots. The uptake rates of La and Ce by the plants were much higher than the translocation rates from roots to shoots. The accumulation and distribution of La and Ce in the seedlings in exposure-recovery groups showed that there was very little excretion through metabolism during the recovery period, but redistribution occurred throughout the whole plant. No apparent selective uptake was found between La and Ce by the plants when they were applied in combination.     

偶氮染料结构与其生物降解性关系研究进展

本文阐述了偶氮染料结构－生物降解性定性关系，生物降解机制，并对偶氮染料结构－生物降解性定量关系的有关参数进行了论述。     

铅锌硫化矿浮选废水回用的应用研究

通过对一矿山的铅锌硫化矿浮选废水回用工艺的分析，提出了对部分浮选废水直接回用，其余部分废水适度净化处理后再回用，使浮选废水100％回用于选矿生产的处理工艺，本工艺可达到使浮选废水的完全回用的目的，对国内众多的浮选企业提出了一种可行的废水处理方法。     

脱硫石膏农业利用研究进展与展望

概述火电厂脱硫石膏定义、生产过程和性质。简述了脱离石膏的工业利用，详述了脱离石膏对酸性和碱性土壤改良的现状和机理，并展望了脱硫石膏促进滩涂土植被演替的前景。     

冷弯成形过程的计算

通过将冷弯变形分离为两部分,一部分为约束变形,另一部分为待定的反弹变形,然后使用两个简单函数来分别模拟,再利用弹性理论中的能量原理获得了整个变形过程的计算公式.最后通过实例计算验证了公式的有效性.