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Jian-Wei Dong,Le Cai,Xue-Jiao Li,Jia-Peng Wang,Rui-Feng Mei,Zhong-Tao Ding 대한약학회 2017 Archives of Pharmacal Research Vol.40 No.12
Three new monoterpene phenylpropionic acidesters, illigerates A–C (1–3), and one new aporphinealkaloid, illigeranine (4), as well as four known ones,actinodaphnine (5), nordicentrine (6), 8-hydroxy carvacrol(7), and 3-hydroxy-a,4-dimethyl styrene (8), were isolatedfrom the tubers of Illigera aromatica. The structures of 1–4were identified by HRESIMS, 1D and 2D NMR, andelectronic circular dichroism spectra. Compound 1 potentlyinhibited NO production in LPS-stimulated RAW264.7cells with an IC50 value of 18.71 ± 0.85 lM; compound 1,3, and 4 showed moderate butyrylcholinesterase inhibitoryactivities with the IC50 values of 46.86 ± 0.65,53.51 ± 0.71, and 31.62 ± 1.15 lM, respectively. Compound4 showed weak AChE inhibitory activity with anIC50 value of 81.69 ± 2.07 lM, and compounds 5 and 6possessed moderate AChE inhibitory activities with theIC50 values of 47.74 ± 1.66 and 40.28 ± 2.73 lM,respectively. This paper provides a chemical structure andbioactive foundation for using I. aromatica as an herbalmedicine.
Kang Zhong-Jian,Sun Yi-Sen,Liu Jia-Xuan 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.2
The existing asynchronous motor parameter identification methods only identify the parameters of the asynchronous motor itself, ignoring the identification of the parameters of the load carried by the asynchronous motor. This paper proposes an integrated parameter identification method of the asynchronous motor that uses the improved PSO (Particle Swarm Optimization, PSO) and considers the load adaptive characteristics. Compared with the traditional method, this method firstly combines the PSO method with Space Disturbance (SD) to form an improved PSO method, which prevents the PSO from falling into a local optimal state and enhances the global optimization ability of the PSO method. Secondly, according to the characteristics of different loads, a load identification strategy is constructed. This strategy can judge the type of load carried by the asynchronous motor, which reduces the optimization exploration space of the PSO algorithm and accelerates the optimization speed of the PSO algorithm. Finally, according to the identified load types, the improved particle swarm optimization algorithm combined with the spatial disturbance is used to realize the integrated identification of the asynchronous motor and the load parameters. The validity of the algorithm is verified by an example, and the factors affecting the identification accuracy are analyzed.
Kinetics of Nitrogen Absorption in Molten AISI 316 Stainless Steel During Immersion Nitrogen Blowing
Chen Jian-Bin,Chen Qi-Zhong,Chen Zhao-Ping,Jiang Zhou-Hua,Huang Zong-Ze,Pan Jia-Qi 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.1
Nitrogen absorption in molten metal for stainless steel AISI316 has been investigated by immersion nitrogen blowing through an immersed alumina nozzle with an internal diameter of 3 mm. Based on these experimental data, some kinetic parameters of nitrogen absorption, such as reaction order, rate constant and apparent activation energy of nitrogen absorption reaction, have been obtained. Effect of stirring by immersion nitrogen blowing through an immersed alumina nozzle on nitrogen absorption reaction has been observed. Results show the following: (1) Nitrogen absorption reaction is the −1.5th order reaction. The rate constant N is of the order of 10−5wt%2.5·min −1. Nitrogen absorption reaction for AISI 316 has negative apparent activation energy of −92.40 kJ·mol −1. This indicates that the nitrogen absorption reaction has a complex and multistep reaction mechanism. (2) The rate of nitrogen absorption reaction in molten stainless steel is mixture control by the adsorption of monatomic nitrogen on the surface of molten stainless steel and mass transfer in molten metal. (3) A rate equation of nitrogen absorption reaction has been derived based on a mixed control mechanism by both the -1st order nitrogen absorption reaction and mass transfer in molten metal.
Ru-Jian Ma,Chun-Yan Wang,Yan-Wei Liu,Thasma Raman Sivakumar,Zi-Xu Ren,Ying Fang,Jun-Qiang Jia,Zhong-Zheng Gui 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.1
While screening for cellulase-producing fungi from insect gut, a fungus with high endoglucanase (carboxymethylcellulase; CMCase) activitywas isolated fromthe larval gut of Bombyx mori. Based onmorphological characteristicsand using an 18S rRNA-based molecular phylogenetic approach, the fungus, strain BMC-2, was identified as aMucor sp. expressing a novel alkalotolerant cellulase. The maximum production of cellulase by the BMC-2 strainwas observed at 55°C and pH8.0. The CMCase activity was inhibited by Cu2+ N Na+ N Zn2+ N Mg2+ N Ba2+, andinduced by Ca2+, Mn2+, Fe2+, and K+.
Ding, Zhi-Jia,Qi, Lu,Ye, Jian-Zhong The Polymer Society of Korea 2008 Macromolecular Research Vol.16 No.1
Based on the sheath-core bicomponent composite fibers with modified polystyrene (PS) and the modified polypropylene (PP), composite fibers obtained were further cross-linked and sulphonated with chlorosulphonic acid to produce strong acidic cation ion exchange fibers. The structures of the fibers obtained were characterized using Fourier transform infrared (FT-IR) spectroscopy, differential scanning calorimetry (DSC) etc. The optimal technology of the fibers obtained is discussed. The static absorption capacity of the sheath-core bicomponent composite cation exchange fibers for $Zn^{2+}$, $Cu^{2+}$ was determined. The absorption kinetics and major factors affecting the absorption capacities of $Zn^{2+}$, $Cu^{2+}$ were studied, and its chemical stability and regenerating properties were probed. The results suggest that cation exchange fibers with better mechanical properties and higher exchange capability were obtained. Moreover, this type of ion exchange fiber has good absorption properties and working stability to various metal ions. Hence, they have higher practicability.
Recovery of Ganoderic Acids from Ganoderma lucidum Mycelia by Macroporous Adsorption Resins
Ying-bo Li,Jia-le Wang,Jian-Jiang Zhong 한국생물공학회 2012 Biotechnology and Bioprocess Engineering Vol.17 No.2
In this work, the performance and adsorption characteristics of macroporous resins for the recovery and enrichment of ganoderic acid (GA)-Mk and GA-T from Ganoderma lucidum mycelia were systematically evaluated. ADS-8 resin displayed the best adsorption and desorption capacities among the tested resins based on batch experiments. The interaction between solute and ADS-8 resin at different temperatures was described in terms of Langmuir and Freundlich isotherms, and the equilibrium experimental data were well fitted to the two isotherms. Thermodynamic analysis indicated the exothermic and spontaneous nature of the adsorption process. The adsorption capacity of ADS-8 resin was found to depend strongly on the pH value of the initial solution. Dynamic adsorption and desorption tests were performed on an ADS-8 resin-packed column to obtain optimal parameters for recovering GA-Mk and GAT from G. lucidum extract. Under optimized conditions, a laboratory scale-up preparation of GA-Mk and GA-T was carried out. The contents of GA-Mk and GA-T were increased from 45 to 22 mg/g in the crude extract to 352and 141 mg/g in the final product with recovery yields of 90.1 and 72.2%, respectively. These results demonstrated that ADS-8 resin chromatography could act as a useful approach for obtaining ganoderic acids from G. lucidum mycelia.
( Luo Ming Fang ),( Xing Jian Min ),( Gou Zhong Xuan ),( Liu Hui Zhou ),( Chen Jia Yong ) 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.4
The desulfurization of dibenzothiophene (DBT), 4,6-dimethyldibenzothiophene (4,6-DMDBT) and their mixture by lyophilized cells of Pseudomonas delafieldii R-8 was studied in the presence of dodecane. The desulfurization rate for 4,6-DMDBT was found to be about 40% in comparison with that for DBT. The desulfurization process for DBT and 4,6-DMDBT proceeded simultaneously without preference for either one. The desulfurization rate for each compound was decreased when they were mixed together. The extent of desulfurization of 4,6-DMDBT was increased with the increase of cell concentration and the decrease of the volume ratio of oil-to-water used. The specific desulfurization rate for 4,6-DMDBT could be reached to 10.4 mmol sulfur kg^(-1) (cell) h^(-1) [approximately 0.33 mg sulfur g^(-1) (cell) h^(-1)]. Pseudomonas delafieldii R-8 showed high desulfurization capability for straight-run diesel oil (containing 1,807 mg/L of sulfur). About 1,000 mg/L of sulfur in diesel oil was removed by resting cells of this strai in 24 h of reaction. The specific desulfurization rate was 8.75 mmol sulfur kg^(-1) (cell) h^(-1).