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XiaoMei Zhang,GuoHong Li,Juan Ma,Ying Zeng,PeiJi Zhao,WeiGuang Ma 한국미생물학회 2010 The journal of microbiology Vol.48 No.6
The endophytic fungus Trichothecium roseum LZ93 from Maytenus hookeri was found to antagonize other pathogenic fungi in vitro. To identify which compound contributed substantially to the antagonism, we fermented the strain and purified its fermentation products. Eleven compounds were obtained, including two trichothecenes, five rosenonolactones, two cardiotonic cyclodepsipeptides, and two sterols. Compound 11β-hydroxyrosenonolactone (1) was assigned according to 1D and 2D-NMR data for the first time. At the same time, the 1H and 13C-NMR assignments for 6β-hydroxyrosenonolactone (2) were revised. Of all of them, only trichothecin (6) showed strong antifungal activity. Based on our observations of the antagonistic activity and the other experimental results, we suggest that the antifungal compound trichothecin was the main contributor to the antagonistic action of T. roseum LZ93.
Theoretical Analysis of Laser-Locked Spectroscopy Employing a Confocal Fabry-Perot Cavity
Lei Dong,Li Linfeng,suotang Jia,wangbao Yin,weiguang ma,Zhang Lei 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.I
A theoretical analysis of laser-locked enhanced absorption spectroscopy employing a confocal Fary-Perot cavity (CFPC) is presented. The signal-to-noise ratio and the minimum detectable absorbance, which are limited by either the shot noise or the amplitude noise due to the loose laser lock loop, are also discussed in detail. The results show that the effective absorption path length of a CFPC configuration is the same as that of the conventional nonconfocal Fary-Perot cavity configuration, with the CFPC configuration being more convenient to align without deliberate mode matching. Thus, the CFPC configuration should greatly simplify the complications of conventional laser-locked spectroscopy.