Xiuling Zhou

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In this study, an esterase, designated EstC23, was isolated from a soil metagenomic library. The protein was amenable to overexpression in Escherichia coli under control of the T7 promoter, resulting in expression of the active, soluble protein that constituted 30% of the total cell protein content. This enzyme showed optimal activity at 40 °C and retained(More)
The CHSO algorithm is a fast algorithm for computing the contribution of a point to the hypervolume of the whole set directly. In this paper an improved CHSO is described. And it is explained by theory why not only the points in the first nondominated front, but also the points in the second nondominated front which are dominated only by one of points in(More)
Regularization is a solution to solve the problem of unstable estimation of covariance matrix with a small sample set in Gaussian classifier. And multi-regularization parameters estimation is more difficult than single parameter estimation. In this paper, KLIM_L covariance matrix estimation is derived theoretically based on MDL (minimum description length)(More)
The reliability model can be optimized with a multi-objective optimization algorithm, while hypervolume-based multi-objective evolutionary algorithms (MOEAs) have been shown to produce better results for multi-objective problem in practice. When hypervolume is used in some MOEAs as archiving strategy, diversity mechanism or selection criterion to guide the(More)
A novel chitinolytic enzyme-producing bacterium Chitiniphilus sp. LZ32 was isolated. Non-pretreated Housefly larvae powder (HLP) was used as an adsorbent to purify chitinolytic enzymes. The optimal conditions for hydrolysis of HLP by purifying enzymes chitinolytic enzymes were investigated. HPLC and MALDI-TOF analyses indicated that HLP enzymatic(More)