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Xiaotong Xu,정행순,이지은,강우신,류시형,김광욱,변의홍,조영제,안동현 한국미생물·생명공학회 2020 Journal of microbiology and biotechnology Vol.30 No.1
This study investigated the characterization and functionality of Undaria pinnatifida root (UPT) extracts, degraded using a crude enzyme from Shewanella oneidensis PKA1008. To obtain the optimum degrading conditions, the UPT was mixed with alginate degrading enzymes from S. oneidensis PKA 1008 and was incubated at 30°C for 0, 3, 6, 12, 24, and 48 h. The alginate degrading ability of these enzymes was then evaluated by measuring the reducing sugar, viscosity, pH and chromaticity. Enzymatic extract at 24 h revealed the highest alginate degrading ability and the lowest pH value. As the incubation time increased, the lightness (L *) also decreased and was measured at its lowest value, 39.84, at 12 hours. The redness and yellowness increased gradually to 10.27 at 6 h and to 63.95 at 3 h, respectively. Moreover, the alginate oligosaccharides exhibited significant anti-inflammatory activity. These results indicate that a crude enzyme from S. oneidensis PKA 1008 can be used to enhance the polysaccharide degradation of UPT and the alginate oligosaccharides may also enhance the anti-inflammatory effect.
Hybrid Control and Protection Scheme for Inverter Dominated Microgrids
Xiaotong Xu,Huiqing Wen,Lin Jiang,Yihua Hu 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.3
With the high penetration of various sustainable energy sources, the control and protection of Microgrids has become a challenging problem considering the inherent current limitation feature of inverter-based Distributed Generators (DGs) and the bidirectional power flow in Microgrids. In this paper, a hybrid control and protection scheme is proposed, which combines the traditional inverse-time overcurrent protection with the biased differential protection for different feeders with different kinds of loads. It naturally accommodates various control strategies such as P-Q control and V-f control. The parameter settings of the protection scheme are analyzed and calculated through a fast Fourier transform algorithm, and the stability of the control strategy is discussed by building a small signal model in MATLAB. Different operation modes such as the grid-connected mode, the islanding mode, and the transitions between these two modes are ensured. A Microgrid model is established in PSCAD and the analysis results show that a Microgrid system can be effectively protected against different faults such as the single phase to ground and the three phase faults in both the grid-connected and islanded operation modes.
Xiaotong Liu,홍성인,박세진,DELAPENAJUNEBRYAN,Haiyan Che,윤서영,김동현,김종민,Mudan Cai,Victoria Risbrough,Mark A. Geyer,신찬영,정재훈,박해일,류재환,류종훈 대한약학회 2013 Archives of Pharmacal Research Vol.36 No.7
We previously reported that oroxylin A, ac-aminobutyric acid A (GABAA) receptor antagonist,ameliorates drugs-induced memory impairments. We synthesizedseveral oroxylin A derivatives in efforts to find asubstance that has pro-cognitive effects as well as improvessensorimotor gating. The aim of the present study is toinvestigate the effect of a novel oroxylin A derivative,5,7-dihydroxy-6-methoxy-2(4-phenoxyphenyl)-4H-chromene-4-one (DMPC), on pharmacological models of schizophrenia,which exhibit memory impairment and sensorimotor gatingdeficit. Memory impairment was induced by scopolamine,a muscarinic receptor antagonist, or MK-801, an N-methyl-Daspartatereceptor antagonist. Sensorimotor gating deficitswere induced by MK-801 and measured by prepulse inhibition(PPI) of the acoustic startle response task. DMPC treatment(20 mg/kg) significantly attenuated scopolamine- or MK-801-induced memory impairment and it even enhanced cognitiveperformance of normal animals. Furthermore, DMPC significantlyameliorated MK-801-induced PPI deficits in theacoustic startle response task. In an in vitro study, DMPC(20 lM) inhibited intracellular Cl- influx induced by muscimol,a selective GABAA receptor agonist. These results suggestthat DMPC would be a potential candidate for alleviatingcognitive dysfunction and sensorimotor gating deficits inschizophrenia, and that its effects may be mediated, in part, viablockade of the GABAergic neurotransmitter system.
Xiaotong Gao,Yu Gao,XiaoCi Jiang KOREA INSTITUTE FOR HUMANITIES AND SOCIAL SCIENCES 2024 Journal of Arts and Cultural Studies(ACS) Vol.3 No.1
Background: Since the 21st century, Chinese children's films have developed and flourished. However, their themes often use rigid preaching forms to showcase educational themes. These themes are detached from childlike thoughts and not conducive to film development. Purpose: This article reflects on the old adult-centered ideology in the theme of Chinese children's films. It attempts to face the impact of the capitalist market and how children's films can maintain a child-centered perspective and avoid excessive adulthood and entertainment. Methods: This article uses case analysis, literature research, and comparative research methods to analyze childern’s films creation and educational inspiration based on children's standards. Results: Sorting out the creative commonalities and characteristics of children's films in the early stages of reform and opening up, exploring the elimination of adult-oriented ideas in old children's films through creation, innovating fresh and natural blank lens language, and returning to a child-oriented perspective. Conclusion: From an adult-centered to a child-centered approach, creators should change the following aspects: 1) The plot narrative should not be too heavy and direct, and political and ideological colors should be weakened and return to a childlike nature. 2) From neglecting children to discovering children, highlighting the independent status of children's image subject. The lens language shifts from an adult perspective to a children's perspective, creating the artistic world with children's eyes.