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Cheng-fa Cai,Yun-feng Zhao,Lei Feng,Lei Wang,Qing-zhong Kong 대한약학회 2009 Archives of Pharmacal Research Vol.32 No.4
Tetrazolium violet (TV), a tetrazolium salt, was synthesized as a novel and potent anticancer agent with a broad spectrum of anticancer activity against many cancer cells. A previous study showed that tetrazolium violet inhibited cell growth, and induced cell cycle arrest and apoptosis in C6 Rat glioma cells. It also showed that treatment of cells with TV for 24 h resulted in a dramatic up-regulation of p53, and an increase in the activity of caspase-3, accompanied with a significant increase of Bax/Bcl-2 ratio. In this study, we further investigated which Fas/FasL and caspase were activated by TV during the apoptosis. Annexin-V-propidium iodide (PI) binding assay and nucleosome ELISA assay further indicated that TV induced a typical apoptosis, in a time-dose-dependent manner. The data showed that the activity of Fas/FasL and caspase-8 and -9 were significantly enhanced by the compound, which suggested that TV might be used as a Fas/FasL and caspases promoter to initiate brain cancer cell apoptosis.
Influence of stiffeners on the performance of blind-bolt end-plate connections to CFST columns
Fa-xing Ding,Zhi-cheng Pan,Peng Liu,Shi-jian Huang,Liang Luo,Tao Zhang 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.36 No.4
The paper aims to investigate the mechanical mechanism and seismic effect of stiffeners in blind bolt endplate connection to CFST column. A precise 3D finite element model with considering the cyclic properties of concrete and steel materials was established, and the efficiency was validated through monotonic and cyclic test data. The deforming pattern and the seismic performance of the unstiffened and stiffened blind bolt endplate connections were investigated. Then a parametric analysis was conducted to analyze the contribution of stiffeners and the joint working behaviors with endplate under cyclic load. The joint stiffness classifications were compared and a supplement stiffness classification method was proposed, and the energy dissipation ability of different class connections were compared and discussed. Results indicated that the main deformation pattern of unstiffened blind bolt endplate connections was the local bending of end plate. The vertical stiffeners can effectively alleviate the local bending deformation of end plate. And influence of stiffeners in thin endplate and thick endplate was different. Based on the stiffness of external diaphragm welded connection, a more detailed rigidity classification was proposed which included the pin, semi-rigid, quasi-rigid and rigid connection. Beam was the main energy dissipation source for rigid connection. For the semi-rigid and quasi-rigid connection, the extended endplate, stiffeners and steel beam would all participate in the energy dissipation.
Fa-yang Jin,Song Wang,Wan-Fen Pu,Cheng-dong Yuan,Lei Wang,Ke-xing Li,Can Gong 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.39 No.-
Emulsified oil foam was investigated to improve the flowability of heavy oil under high salinityenvironment of 23 104 mg/L. Sixteen foaming agents were used to determine an applicableformulation. The factors affecting the formation and stability of the emulsified oil foam were evaluated,including oil viscosity, oil–water ratio, foaming agent concentration, stirring rate and time, andtemperature. The microgram of emulsified oil foam was analyzed by polarizing microscope. The resultsshowed that stable pseudo-emulsion film was built. The considerable dynamic viscosity-reducing ratesin different depth in wellbore were obtained according to pressure differential method in long tubephysical simulation experiments.
Study on the Real-Time Precise Orbit Biases Correction Technique for the GPS/VRS Network
LI Cheng-gang,HUANG Ding-fa,ZHOU Dong-wei,ZHOU Le-tao,XIONG Yong-liang,XU Rui 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.2 No.-
A precise real-time method of using the IGS ultra rapid products (IGU) and the GPS broadcast ephemeris to calculate the VRS orbit corrections was presented here which was suited for GPS/VRS reference station network based positioning. Test data acquired from both the SGRSN (Sichuan GPS Reference Station Network) and SCIGN (Southern California integrated GPS network) were used to evaluate the performance of the modeling techniques. The new method was proven to be more precise and reliable compared with the existing conventional network-based orbit error interpolation method. It was shown that 0.004ppm relative accuracy was reached, namely the influence from the orbit bias for the RTK positioning within 100km area can be of sub-millimeter level.
Xu, Cheng-Hua,Jin, Tai-Huan,Jhung, Sung-Hwa,Hwang, Jin-Soo,Chang, Jong-San,Qiu, Fa-Li,Park, Sang-Eon Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.5
Ti-ZSM-5 prepared by secondary synthesis, from the reaction of H-ZSM-5 with vapor phase $TiCl_4$, was characterized with several physicochemical techniques including FT-IR and UV/VIS-DRS. It was found that zeolite structure, surface area and pore volume did not change, and the framework aluminum could not be replaced by titanium atom during the secondary synthesis of Ti-ZSM-5. The incorporation of titanium into the framework might be due to reaction of $TiCl_4$with the silanol groups associated with defects or surface sites. The formation of extra-framework titanium could not be avoided, unless the samples were further treated by water vapor at 550 $^{\circ}C$ or higher temperature. High temperature steam treatment of Ti-ZSM-5 prepared by chemical vapor deposition with $TiCl_4$was efficient to prevent the formation of non-framework titanium species. Ti-ZSM-5 zeolites prepared in this work contained only framework titanium species and exhibited improved catalytic property close to TS-1 prepared by hydrothermal synthesis.
Chin-Fa Hwang,Jen-Han Chang,Jer-Yiing Houng,Cheng-Chih Tsai,Chien-Ku Lin,Hau-Yang Tsen 한국생물공학회 2012 Biotechnology and Bioprocess Engineering Vol.17 No.4
An immune-enhancing strain, Lactobacillus plantarum Pi06, isolated from a healthy infant was used for biomass production following optimization of the medium in shake-flask culture. Preliminary studies showed that commercial MRS medium and cultivation under static conditions generated higher biomass production than four other tested media with or without a shaking condition. The selected medium composition, consisting of glucose,yeast extract, soy peptone, ammonium citrate, and corn steep liquor, was further optimized using a systematic method that integrated the Taguchi array design and the Box–Behnken method. The response effects of these factors were first investigated using Taguchi design under an L16 (45) array. The suggested medium composition,derived from Statistica 7.1 using the Taguchi design, was applied to cultivate cells and a biomass of 7.16 g dry cell weight (DCW)/L was obtained. Response surface methodology based on the Box–Behnken method for the three response variables of glucose, yeast extract, and corn steep liquor was then used to further increase the biomass level to 8.94 g DCW/L. The resulting optimum medium consisted of 35 g/L glucose, 35 g/L yeast extract, and 40 mL/L corn steep liquor. Compared with the initial medium, the biomass yield was improved from 4.31 to 8.94 g DCW/L, an enhancement of approximately 107%.
Zhan-Long Yu,Fa Cheng,Shao-Jing Zhao,Jian-Wei Zhang,Zu-Cheng Cai,Yu Chen 한국고분자학회 2011 Macromolecular Research Vol.19 No.2
Conventional surfactant dodecylbenzenesulfonic acid (DBSA) and its corresponding Gemini surfactant acid (GSA) were simply mixed with a solution of hyperbranched polyethylenimine (HPEI) in chloroform. This resulted in the novel supramolecular complexes, HPEI-DBSA and HPEI-GSA, through a neutralization reaction between the amino groups of HPEI and the sulfonic-acid groups of DBSA and GSA. The formed supramolecular complexes and their precursors were characterized by FTIR, 1H NMR, and dynamic light scattering. HPEI-DBSA and HPEI-GSA exhibited inverted-micelle properties that could accommodate the water-soluble guest molecules in an apolar solvent. With the anionic dye methyl orange (MO) as the model guest, both HPEI-DBSA and HPEI-GSA showed superior guest-encapsulation performance than the supramolecular nanocarrier derived from the assembly of aliphatic acid onto HPEI. For example, HPEI-DBSA and HPEI-GSA nanocarriers could encapsulate more MO molecules, and a much smaller amount of the surfactant molecules was required to achieve the maximum MO encapsulation. These results highlight the importance of strong-acid groups of the surfactants in raising the guest-encapsulation efficiency of this type of supramolecular nanocarrier. HPEI-DBSA and HPEI-GSA had different guestencapsulation mechanisms. This indicates that HPEI-GSA can encapsulate basic guests more than HPEI-DBSA,such as MO and fluorescein sodium (FS), but fewer relatively acidic guests, such as Alizarin Yellow R sodium salt and bromophenol blue.