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克里奇中间体CH2OO与CF3CF=CF2反应的动力学研究
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作者 陈旸 周小虎 +3 位作者 刘义强 金玉奇 董文锐 杨学明 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2020年第2期234-238,I0003,共6页
本文使用OH激光诱导荧光方法研究了结构最简单的克里奇中间体CH2OO和CF3CF=CF2的反应动力学.在压强为10 Torr条件下,测量了温度在283,298,308和318 K的反应速率常数,分别为(1.45±0.14)×10^-13,(1.18±0.11)×10^-13,(... 本文使用OH激光诱导荧光方法研究了结构最简单的克里奇中间体CH2OO和CF3CF=CF2的反应动力学.在压强为10 Torr条件下,测量了温度在283,298,308和318 K的反应速率常数,分别为(1.45±0.14)×10^-13,(1.18±0.11)×10^-13,(1.11±0.08)×10^-13和(1.04±0.08)×10^-13 cm^3·molecule^-1·s^-1.根据阿伦尼乌斯方程,获得该反应的活化能为(-1.66±0.21)kcal/mol.在6.3~70 torr压力范围内,未观察到该反应的速率常数存在压力相关. 展开更多
关键词 克里奇中间体 反应动力学 速率常数
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Bilateral retrocorneal hyaline scrolls secondary to asymptomatic congenital syphilis: A case report
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作者 yu-qi jin Yong-Ping Hu +1 位作者 Qi Dai Shuang-Qing Wu 《World Journal of Clinical Cases》 SCIE 2021年第10期2274-2280,共7页
BACKGROUND Retrocorneal hyaline scrolls are a rare phenomenon.We report a case of bilateral retrocorneal hyaline scrolls that were likely induced by asymptomatic congenital syphilis.CASE SUMMARY A 71-year-old woman pr... BACKGROUND Retrocorneal hyaline scrolls are a rare phenomenon.We report a case of bilateral retrocorneal hyaline scrolls that were likely induced by asymptomatic congenital syphilis.CASE SUMMARY A 71-year-old woman presented with blurred vision due to cataracts.Slit-lamp microscopy revealed bilateral hyaline scrolls with a dichotomous branching pattern extending to the anterior chamber or rods attaching to the rough posterior surface of the cornea.The patient was positive for syphilis-specific antibodies,with no ocular or systemic evidence of congenital or acquired syphilis.Binocular cataract,retrocorneal scroll,and corneal endothelial gutta were considered.The scroll of the right eye was removed during cataract surgery and further observed using hematoxylin–eosin staining and scanning electron microscopy.The cornea of the right eye remained transparent,and the residual scroll seemed stable,however,the corneal endothelial density declined at 13 mo after surgery.In vivo confocal microscopy revealed coalescence of corneal guttae at the level of the corneal endothelium or adhesion to the posterior surface of the endothelium,with enlarged endothelial cells in both eyes.Activated keratocytes in the stroma and a highly reflective acellular structure at the level of the Descemet’s membrane were observed.The removed scroll had a cartilage-like hardness and a circularly arranged fiber-like acellular structure.CONCLUSION Occult congenital syphilis could induce corneal endothelial gutta and theformation of retrocorneal scrolls without other signs of ocular syphilis. 展开更多
关键词 SCROLL Corneal endothelium Congenital syphilis Syphilitic interstitial keratitis In vivo confocal microscopy Case report
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