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- 저자 : Lingxiao Zhang (검색결과 4 건)
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Piyong Zhang,Hai-Jian Yang,Lingxiao Xu 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The solubilities of N,N-dimethylformamide diethyl acetal were measured at temperatures ranging from 313 to 353 K and pressures from 7.8 to 13.3 MPa in supercritical carbon dioxide. The measured solubility data were correlated using the Chrastil, Sung and Shim (SS), and Jouyban–Chan–Foster (JCF) semiempirical models. Consequently, the calculated results showed satisfactory agreement with experimental data and differed from the measured values by between 4.56 and 6.10%. The correlated results indicated that the JCF model provided the best fitness. Solubility data were also utilized to estimate the partial molar volume for the compound in the supercritical phase using the theory developed by Kumar and Johnston.
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Tensile Properties and Structure Characterization of Palm Fibers by Alkali Treatment
Ying Jiang,Penghu Deng,Lingxiao Jing,Tonghua Zhang 한국섬유공학회 2019 Fibers and polymers Vol.20 No.5
This work aims to reveal how the alkali influences the mechanical behavior and structural stability of palm fiber. First, palm fiber samples were treated with 20 % and 40 % NaOH solutions separately for approximately 1, 2, 3, and 4 h atroom temperature. Then the samples were characterized using tensile testing, Fourier transform infrared spectroscopy, X-raydiffraction, and thermogravimetric analysis. Results showed the tensile properties of alkali-treated fibers exceeded those ofuntreated fibers. Notably, the fibers treated with 40 % NaOH for 1 h yielded the most significant improvements. The tensilestrength, elongation at break, Young’s modulus, and yield point increased by 28.8 %, 38 %, 52.1 %, and 64.7 %, respectively,compared with the untreated fibers. The increase appeared to be due to the removal of non-cellulosic materials andrearrangement of the cellulose chains.
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Multi-scale Nano/Micro Fiber Scaffolds with Different Topological Morphologies
Jianyong Feng,Ruixiang Xu,Jiaming Zhao,Lingxiao Zhang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.4
The multi-scale fiber and topological morphologies had been shown to influence cell mitogenesis and chemotaxis,direct cell differentiation, and induce constructive host tissue remodeling responses. To simulate multi-layer meshworkarchitecture of extracellular matrix and regulate cell behavior, we prepared different topological scaffolds, such as 3Dprinting fiber scaffolds, poly(lactic acid) (PLA) electrospun fiber scaffolds, 3D printing/knitted fabric composite scaffolds,and PLA electrospinning/knitted fabric composite scaffolds. The surface morphology, pore diameter, thickness, stress-straincurve, electrical current, and other properties were studied. The aim is to prepare multi-scale nano/micro fiber scaffolds withdifferent topological morphologies and properties that can provide structural and mechanical support for potential tissueengineering applications.
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Metabolic Engineering of Vitamin C Production in Arabidops
Ling Xiao,Ying Xiao,Zinan Wang,Hexin Tan,Kexuan Tang,Lei Zhang 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.4
Vitamin C (L-ascorbic acid, AsA) is a compound which provides major nutritional value, both for plants and humans. In this study, three distinct metabolic engineering strategies, including overexpression of biosynthesis enzyme, suppression of catabolism enzyme and switching the sub-cellular localization of compartment enzyme, were employed to enhance the production of AsA in Arabidopsis thaliana. The results showed that (1) overexpression of L-Galactose-1-P Phosphatase (GalPPase) enhanced AsA content to 3.96 μmol/g FW, which was 1.6-fold more than that in their wild-type (WT) counterparts; (2) RNAi suppression of ascorbate oxidase (AO) resulted in a significant increase of AsA accumulation (0.86 μmol/g FW) in apoplast; (3) both mitochondrion-target and none-target overexpression of L-Galactose dehydrogenase (GalDH) did not significantly promote AsA production compared with WT (1.96 μmol/g), however a dramatic enhancement was observed following infiltration with L-galactono-1, 4-lactone (L-GalL), both in transgenic and WT plants. The best line produced AsA with the content of 3.90 μmol/g FW, which was about 2-fold of that in the untreated control (1.99 μmol/g FW). This study provides new strategies including GalPPase overexpression, AO suppression as well as L-GalL feeding for modern breeding aimed at stimulating the AsA content in plants.
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