大型溞繁殖试验是新化学物质申报中二级及以上常规申报必须提供的生态毒理学数据之一。采用半静态试验方式测试了重铬酸钾对大型溞(Daphnia magna Straus)生长繁殖的毒性效应,试验浓度设定为0.02mg/L、0.03mg/L、0.05mg/L、0.07mg/L、0....大型溞繁殖试验是新化学物质申报中二级及以上常规申报必须提供的生态毒理学数据之一。采用半静态试验方式测试了重铬酸钾对大型溞(Daphnia magna Straus)生长繁殖的毒性效应,试验浓度设定为0.02mg/L、0.03mg/L、0.05mg/L、0.07mg/L、0.11mg/L、0.17mg/L和0.25mg/L,同时进行空白对照试验。采用紫外分光光度法对试验溶液进行浓度分析,实测浓度保持在设定值的±20%内,所以试验结果以设定值为基础表示。结果表明:重铬酸钾对大型溞21d生长繁殖的无观察效应浓度为0.03mg/L,最低可观察效应浓度为0.05mg/L。展开更多
1880年德国神学家、翻译家及汉学家维克多•冯•施特劳斯(Victor von Strauß)出版了历史上第一个以中文原文为母本《诗经》德文译本,因其文学及文化价值得到德国汉学界及文学界的高度赞扬。本文从考察施特劳斯译介《诗经》的动机入手...1880年德国神学家、翻译家及汉学家维克多•冯•施特劳斯(Victor von Strauß)出版了历史上第一个以中文原文为母本《诗经》德文译本,因其文学及文化价值得到德国汉学界及文学界的高度赞扬。本文从考察施特劳斯译介《诗经》的动机入手,从翻译学视角剖析施特劳斯译本在结构、底本依据、韵律、修辞等方面的诗歌翻译策略,探索施特劳斯《诗经》译本的文化价值,并考据其在《诗经》西传德国历史上产生的影响。展开更多
Allelochemicals sustained-release microspheres(ACs-SMs)exhibited great inhibition effect on algae,however,few studies have focused on ACs-SMs toxicity on invertebrate.In this study,the effects of single high-concentra...Allelochemicals sustained-release microspheres(ACs-SMs)exhibited great inhibition effect on algae,however,few studies have focused on ACs-SMs toxicity on invertebrate.In this study,the effects of single high-concentration ACs(15 mg/L,SH-ACs),repeated lowconcentration ACs(3×5 mg/L,RL-ACs)and ACs-SMs containing 15 mg/L ACs exposure on the ingestion,incorporation,and digestion of Daphniamagna Straus(DS)were investigated by stable isotope 15N labeling method.Meanwhile,the diversity and abundance of microflora in DS guts were determined by 16S rRNA genes and cloning methods.The results showed that SH-ACs exposure caused 50%and 33.3%death rates for newborn and adult DS,while RL-ACs exposure caused 10%death rate for newborn DS and no obvious effect on the activity of adult DS.And ACs-SMs exposure did not diminish the motility of both newborn and adult DS,indicating the lower acute toxicity of ACs-SMs.Furthermore,SH-ACs inhibited the ingestion(-6.45%),incorporation(-47.1%)and digestion(-53.8%)abilities of DS and reduced the microbial abundance(-27.7%)in DS guts.Compared with SH-ACs,RL-ACs showed relatively low impact on the ingestion(-3.23%),incorporation(-5.89%)and digestion(-23.9%)abilities of DS.Interestingly,ACs-SMs enhanced the ingestion(+9.68%),incorporation(+52.9%)and digestion(+51.3%)abilities of DS and increased the microbial abundance(+10.7%)in DS guts.Overall ACs and ACs-SMs reduced the diversity of microflora in DS guts.In conclusion,ACs-SMs can release ACs sustainably and prolong the sustained release time,which not only effectively reduce the toxicity of ACs,but also had positive effects on DS.展开更多
文摘大型溞繁殖试验是新化学物质申报中二级及以上常规申报必须提供的生态毒理学数据之一。采用半静态试验方式测试了重铬酸钾对大型溞(Daphnia magna Straus)生长繁殖的毒性效应,试验浓度设定为0.02mg/L、0.03mg/L、0.05mg/L、0.07mg/L、0.11mg/L、0.17mg/L和0.25mg/L,同时进行空白对照试验。采用紫外分光光度法对试验溶液进行浓度分析,实测浓度保持在设定值的±20%内,所以试验结果以设定值为基础表示。结果表明:重铬酸钾对大型溞21d生长繁殖的无观察效应浓度为0.03mg/L,最低可观察效应浓度为0.05mg/L。
文摘1880年德国神学家、翻译家及汉学家维克多•冯•施特劳斯(Victor von Strauß)出版了历史上第一个以中文原文为母本《诗经》德文译本,因其文学及文化价值得到德国汉学界及文学界的高度赞扬。本文从考察施特劳斯译介《诗经》的动机入手,从翻译学视角剖析施特劳斯译本在结构、底本依据、韵律、修辞等方面的诗歌翻译策略,探索施特劳斯《诗经》译本的文化价值,并考据其在《诗经》西传德国历史上产生的影响。
基金supported by National Natural Science Foundation of China (Nos. 41977317, 42177051)Beijing Natural Science Foundation (No. 8182037)
文摘Allelochemicals sustained-release microspheres(ACs-SMs)exhibited great inhibition effect on algae,however,few studies have focused on ACs-SMs toxicity on invertebrate.In this study,the effects of single high-concentration ACs(15 mg/L,SH-ACs),repeated lowconcentration ACs(3×5 mg/L,RL-ACs)and ACs-SMs containing 15 mg/L ACs exposure on the ingestion,incorporation,and digestion of Daphniamagna Straus(DS)were investigated by stable isotope 15N labeling method.Meanwhile,the diversity and abundance of microflora in DS guts were determined by 16S rRNA genes and cloning methods.The results showed that SH-ACs exposure caused 50%and 33.3%death rates for newborn and adult DS,while RL-ACs exposure caused 10%death rate for newborn DS and no obvious effect on the activity of adult DS.And ACs-SMs exposure did not diminish the motility of both newborn and adult DS,indicating the lower acute toxicity of ACs-SMs.Furthermore,SH-ACs inhibited the ingestion(-6.45%),incorporation(-47.1%)and digestion(-53.8%)abilities of DS and reduced the microbial abundance(-27.7%)in DS guts.Compared with SH-ACs,RL-ACs showed relatively low impact on the ingestion(-3.23%),incorporation(-5.89%)and digestion(-23.9%)abilities of DS.Interestingly,ACs-SMs enhanced the ingestion(+9.68%),incorporation(+52.9%)and digestion(+51.3%)abilities of DS and increased the microbial abundance(+10.7%)in DS guts.Overall ACs and ACs-SMs reduced the diversity of microflora in DS guts.In conclusion,ACs-SMs can release ACs sustainably and prolong the sustained release time,which not only effectively reduce the toxicity of ACs,but also had positive effects on DS.
