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( Fan Yang ),( Yanfen Gong ),( Gang Liu ),( Shengming Zhao ),( Juan Wang ) 한국미생물 · 생명공학회 2015 Journal of microbiology and biotechnology Vol.25 No.7
The role of CRE1 in a thermophilic fungus, Myceliophthora thermophila ATCC42464, was studied using RNA interference. In the cre1-silenced strain C88, the filter paper hydrolyzing activity and β-1,4-endoglucanase activity were 3.76-, and 1.31-fold higher, respectively, than those in the parental strain when the strains were cultured in inducing medium for 6 days. The activities of β-1,4-exoglucanase and cellobiase were 2.64-, and 5.59-fold higher, respectively, than those in the parental strain when the strains were cultured for 5 days. Quantitative reverse-transcription polymerase chain reaction showed that the gene expression of egl3, cbh1, and cbh2 was significantly increased in transformant C88 compared with the wild-type strain. Therefore, our findings suggest the feasibility of improving cellulase production by modifying the regulator expression, and an attractive approach to increasing the total cellulase productivity in thermophilic fungi.
Color center of YAlO3 with cation vacancies
Jianyu Chen,Dunhua Cao,Guangjun Zhao,Shengming Zhou 한국물리학회 2010 Current Applied Physics Vol.10 No.2
High quality pure YAlO3 crystal with dimension of Ø 30 × 50 ㎟ was grown by Czochralski technique. UV irradiation and air annealing bring additional absorption in the region 200–800 nm. The absorption spectra of perfect YAlO3 and YAlO3 containing cation vacancy (aluminium vacancy and yttrium vacancy)were calculated using density functional theory code CASTEP. Comparison of the simulated absorption spectra with the experimental absorption spectra of YAlO3 after UV irradiation and air annealing treatments shows that cation vacancies are responsible for part of the coloration on YAlO3 crystal.