Coesite inclusions in zircon from gneisses identified by laser Raman microspectrometer in ultrahigh pressure zone of Dabie Mountains, China
摘要:
The mineral inclusions in zircon from gneisses in ultra-high pressure (UHP) zone of the Dable Mountains were identified by using a laser Raman microspectrometer. Coesite occurs as inclusions in zircons from all types of gneiss. Other important minerals, such as jadeite, omphacite, aragonite, barite, and anhydrite were also found as inclusion minerals. These discoveries indicate that (i) gneissic country rocks had metamorphosed at the same time as the enclosed eclogites; and (ii) SO4-2-bearing fluids were present in the UHP metamorphic process, which is manifested by occurrence of barite and anhydrite coexisting with coesite.
Effect of Mn cluster on the formation of Superoxide radicals in photoinhibition of photosystem II
作者:Suping Zhang、Tiecheng Tu、Jun Weng、Jingxi Pan、Chunhe Xu、Side Yao
DOI:10.1007/bf02901162
日期:2001.11
To further realize the action of superoxide radicals (O-2(-.)) in photoinhibition of photosystem II (PS II), we employed 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) as a spin trap, associated with EPR spectroscopy, to study the effect of illumination time on O-2(-.) formation during high light photoinhibition in PS II membranes and Mn-depleted PS II membranes. Results indicated that the removal of Mn cluster from PS II membranes has a strong influence on the dynamics of superoxide formation. The relative mechanism was also discussed. These novel findings may further promote the studies of the structure and function of PS II and the mechanism of photoinhibition.
Knunjanz; Schokina, Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1955, p. 462,467; engl. Ausg. S. 409, 413
作者:Knunjanz、Schokina
DOI:——
日期:——
Knunjanz et al., Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1959, p. 1777,1781
作者:Knunjanz et al.
DOI:——
日期:——
Sues, Justus Liebigs Annalen der Chemie, 1949, vol. 564, p. 54,62