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Characterization of Ga NAs/ Ga As and Ga In NAs/ Ga As Quantum Wells Grown by Plasma-Assisted Molecular Beam Epitaxy: Effects of Ion Damage

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Journal of Semiconductors 2001年第1期22卷 31-34页

作者：李联合潘钟张伟林耀望王学宇吴荣汉中国科学院半导体研究所集成光电子开放实验室北京100083

The effects of ion damage on Ga NAs/Ga As and Ga In NAs/Ga As quantum wells ( QWs) grown by plas- ma- assisted molecular beam epitaxy have been investigated. Itis found thation damage is a key factor affecting the quality of Ga NAs and Ga In NAs QWs. Obvious appearance of pendello¨ sung fringes in x- ray diffraction pattern and remarkable im provement in the optical properties of the samples grown with ion removal magnets are *** removing nitrogen ions,the PL intensity of the Ga In NAs QW is improved so as to be comparable with that of Ga In As QW. The stronger is the magnetic field,the m ore obvious the PL intensity im provement would be.

关键词： Ga( In) NAs molecular beam epitaxy ( MBE) ion dam age x- ray photoluminescence ( PL )

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Chemical and molecular characterization of Hong Dangshen,a unique medicinal material for diarrhea in Hong Kong

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Journal of Chinese Pharmaceutical Sciences 2007年第3期16卷 202-207页

作者：张艳波江仁望李松林乔春峰韩全斌徐宏喜黄家乐毕培曦邵鹏柱香港中文大学中医中药研究所香港赛马会中药研究院

Aim To investigate the plant origin and the identity of the red substance on the surface of Hong Dangshen, a unique medicinal material for diarrhea in Hong Kong. Methods The HPLC fingerprints and 5S rRNA gene spacer sequences of Hong Dangshen were obtained and compared with those of genuine species of Radix Codonopsis. The x-ray diffraction spectrum of the red substance was analyzed and compared with that of Halloysitum fingerprints to the Codonopsis species and the highest similarity to Rubrum. Results Hong Dangshen showed very similar HPLC Codonopsis pilosula var. modesta in terms of 5S rRNA gene spacer sequences. The x-ray diffraction spectrum of the red substance was consistent with that of Halloysitum Rubrum. Conclusion The source plant of Hong Dangshen was suggested to be Codonopsis pilosula var. modesta, one of the genuine original plants of Radix Codonopsis （Dangshen） in the China Pharmacopoeia （2005 edition）. The red substance on the surface of Hong Dangshen was indicated to be Halloysitum Rubrum, a traditional medicinal mineral for chronic diarrhea. Our data suggest that Hong Dangshen is derived from the roots of Codonopsis pilosula var. modesta which has been processed with Halloysitum Rubrum, and the name is suggested to be Radix Codonopsis Praeparata Halloysita Rubra.

关键词： Radix Codonopsis Praeparata Halloysita Rubra Codonopsis pilosula var. modesta HPLC 5S rRNA gene spacer x- ray Halloysitum Rubrum lobetyolin

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