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The joint toxicity of two toxicants to swordtail fish was synergistic in 24h and antagonistic in 48h and 96h, both were treated as ratio 1∶1 of toxi...

剑尾鱼对Hg和Se的最大容许浓度分别为：0.0084和0.064 mg/L。结果还表明：剑尾鱼幼体对Hg和Se敏感，是一种较理想的环境污染指示生物。

Highly toxi c solvents benzene,tetrachloromethane,methanol were replaced by toluene,1,2-di c hloroethane,ethanol in the course of reaction and purification.

甲基 2 ，1，3 苯并噻二唑的溴化改在低毒性的 1，2 二氯乙烷中进行，革除了高毒性的四氯化碳。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。