The autooxidation of 2,3,5,6-tetrahydroxy-2,5-cyclohexadiene-1,4-dione under physiological conditions

Summary A radical anion of 2,3,5,6-tetrahydroxy-2,5-cyclohexadiene-1,4-dione was detected using the EPR technique by complexing with Zn ions. Hydrogen peroxide, superoxide radical anion and hydroxyl radical were also detected in the reaction mixture. Kinetic study and product distribution indicated a probable mixed type one- and two-electron transfer mechanism. A possible relationship between the autooxidation process and the biological activity of substituted quinones was suggested.     

环境微生物的分子生物学研究方法

本文介绍了在环境微生物生态研究中的分子生物学方法如分子杂交，聚合链式扩增技术PC震，rRNA基因同源分析法，新型凝胶电泳技术，生物醌谱图法等和应用。这些技术的使用将大大扩展微生物生态学研究的空间，并使得在分子水平研究生态问题的机制成为可能。     

Antifeedant nature of the quinone primin and its quinol miconidin fromMiconia spp

Summary The quinone primin (1) and its quinol miconidin (2) which occur naturally in Miconia spp. (Melastomataceae), were synthesized and then tested as potential antifeedants against 6 insect species. Antifeedant activity was found in all cases, ranging from primin (1) being most active againstPieris brassicae, to miconidin (2) being only slightly effective againstHeliothis armigera.