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Secretory Expression and Purification of the Recombinant Duck Interleukin-2 in Pichia pastoris
( Cui Hong Du ),( Long Han ),( An Feng Xiao ),( Min Jie Cao ) 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.12
Interleukin-2 (IL-2) is a vital cytokine secreted by activated T lymphocytes, and plays an important role in the regulation of cellular functions and immunity of animals. In this study, the recombinant duck IL-2 (rduIL-2) was secretory expressed in Pichia pastoris (P. pastoris). The recombinant P. pastoris strain was cultured in shake flasks and then scaled up in a 5.0-l bioreactor. The result showed that the maximal fresh-cell-weight of 594.1 g/l and the maximal OD600 of 408 were achieved in the bioreactor. The rduIL-2 was purified by two steps of purification procedures, and approximately 311 mg of rduIL-2/L fermentation supernatant was obtained. SDS-PAGE showed that the purified rduIL-2 constituted a homogeneous band of ~16 kDa or ~14 kDa corresponding to the glycosylated or non-glycosylated duIL-2 protein in size, respectively. The bioactivity of rduIL-2 was determined by lymphocyte proliferation assay. The result indicated that the rduIL-2 greatly promoted the proliferation of ConA-stimulated lymphocytes in vitro. The P. pastoris expression system described here could provide promising, inexpensive, and large-scale production of the rduIL-2, which lays the foundation for development of novel immunoadjuvants to enhance both the immunity of ducks against various infectious pathogens and vaccine efficacy.
NANOSIZED HYDROXYAPATITE/COLLAGEN COMPOSITE
Feng, Feng, Q,L,Cui, Cui, F.Z,Wang, Wang, R.Z,Du, Du, C,Li, Li, H.D 한국재료학회 1995 Fabrication and Characterization of Advanced Mater Vol.1 No.2
This paper reported the synthesis of a nano-Hydroxyapatite(HAp)/collagen biocomposite and its biological performances. A thoroughly mixed slurry of type I collagen in supersaturated HAp solution was obtained. HAp was then controlled to precipitate on collagen by adjusting the solution properly. SEM, XRD and TEM analysis reveals that HAp in the composite was nanometer sized and uniformly dispersed oncollagen matrix. In vitro biocompatibility of this new biomaterial was evaluated in terms of its biodegradation and bioactivity. The mice macrophage and osteoblast were used for the study, and the behavior of the cells in contact with the composite was investigated by means of SEM. The observations showed that the composite can be degraded through extracellular resorption process mediated by macrophage, and they can also be well-contact with osteoblast cells, in vitro.
Cui Zhao-Hui,Li Yan-Ping,Liu Ai-Ling,Zhang Qian,Du Wei-Jing,Ma Guan-Sheng The Korean Society of Community Nutrition 2004 Journal of community nutrition Vol.6 No.3
The purpose of this study is to compare the relative risk of metabolic syndrome (MS) in middle aged adults with different body weights. 155 subjects living in urban Beijing were recruited from 24 neighborhood committees of urban Beijing. They were divided into normal weight, overweight and obese groups according to their BMIs. The general information of the subjects was collected using an interview-administered questionnaire. Standard procedure was followed to measure subject's weight, height and waist. Biochemical parameters (total cholesterol (TC), low- and highdensity lipoprotein cholesterol (LDL-C ; HDL-C), triglyceride (TG), and fasting glucose) and blood pressure were also determined. The results indicated that the systolic and diastolic blood pressure, HDL-C of obese group was lower than that of the normal weight group. Fasting glucose of obese males was significantly higher than that of normal weight males. No significant difference of fasting glucose was found among female groups. No significant difference of TG was found among male groups, while TG of overweight and obese females was both significantly higher than normal weight females. There was no significant difference of TC and LDL-C among normal weight, overweight and obese groups in both males and females. The MS rate of obese males was significantly higher than the normal weight and overweight males, as was the female. The relative risk of MS in obese group was about 11 times higher (OR=11.249, $95\%CI$ = 3.812 - 33.191) than the normal weight group after adjusting for age, gender, smoking, drinking, family economic level and education status. It is concluded that obesity contributed to lower HDL-C, hypertriglyceride, hypertension and MS after controlling the effects of age, gender, socioeconomic status, alcohol drinking and smoking. Obese individuals have a higher risk of having MS than their normal weight counterparts.
Preparation of Si3N4-based antimicrobial coatings from suspensions with long-time stability
Du Songmo,Zhang Jie,Sun Siyuan,Lifei Zhang,Chen Zhanglin,Zhang Shijia,Zhao Shuo,Tian Zhaobo,Ning Xiaoshan,Chen Kexin,Cui Wei,Liu Guanghua 한국세라믹학회 2024 한국세라믹학회지 Vol.61 No.3
A Si 3N4-based antimicrobial coating was fabricated from suspensions with long-time stability. The stability of Si 3N4 sus- pension and the antimicrobial performance of coating were investigated. The viscosity of Si 3N4 suspension was found to be the key factor aff ecting both stability and antimicrobial performance. The Si 3N4 suspensions were modifi ed with HASE acrylic copolymer, PAA-NH 4, and Polyurethane, resulting in an improvement of the stability of Si 3N4 suspension from a few hours to six months. The coating produced using the modifi ed Si 3N4 suspension exhibited an antibacterial activity of 99.9%. This study highlights the crucial role of modifying the Si 3N4 suspension in improving its long-term stability and coating antimicrobial activity.
The RTEL1 rs6010620 Polymorphism and Glioma Risk: a Meta-analysis Based on 12 Case-control Studies
Du, Shu-Li,Geng, Ting-Ting,Feng, Tian,Chen, Cui-Ping,Jin, Tian-Bo,Chen, Chao Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.23
Background: The association between the RTEL1 rs6010620 single nucleotide polymorphism (SNP) and glioma risk has been extensively studied. However, the results remain inconclusive. To further examine this association, we performed a meta-analysis. Materials and Methods: A computerized search of the PubMed and Embase databases for publications regarding the RTEL1 rs6010620 polymorphism and glioma cancer risk was performed. Genotype data were analyzed in a meta-analysis. Odds ratios (ORs) with 95% confidence intervals (CIs) were estimated to assess the association. Sensitivity analyses, tests of heterogeneity, cumulative meta-analyses, and assessments of bias were performed in our meta-analysis. Results: Our meta-analysis confirmed that risk with allele A is lower than with allele G for glioma. The A allele of rs6010620 in RTEL1 decreased the risk of developing glioma in the 12 case-control studies for all genetic models: the allele model (OR=0.752, 95%CI: 0.715-0.792), the dominant model (OR=0.729, 95%CI: 0.685-0.776), the recessive model (OR=0.647, 95%CI: 0.569-0.734), the homozygote comparison (OR=0.528, 95%CI: 0.456-0.612), and the heterozygote comparison (OR=0.761, 95%CI: 0.713-0.812). Conclusions: In all genetic models, the association between the RTEL1 rs6010620 polymorphism and glioma risk was significant. This meta-analysis suggests that the RTEL1 rs6010620 polymorphism may be a risk factor for glioma. Further functional studies evaluating this polymorphism and glioma risk are warranted.
Yunling Du,Yanhong Yang,Shuai Guan,Xinguang Wang,Chuanyong Cui,Jinguo Li,Yizhou Zhou,Xiaofeng Sun 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.1
A discontinuous plastic flow is detected in a single-crystal superalloy with an [001] orientation during tensile tests over a wide temperature range. Results reveals that the synergistic impact of normal γ′ precipitates and nanoscale γ′ precipitates in γ matrix on the dislocations motion is the root of the serrated flow.
최걸 ( Cui Jie ),오민호 ( Oh Min-ho ),손창두 ( Son Chang-du ),박선규 ( Park Sun-kyu ),오광진 ( Oh Kwang-chin ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
Nowadays because of reification and diversification of the constructive technology and the constructive standards, there is no certification system of evaluation quality in material, design, and construction of strengthening. What's more, the investigation system of the strengthening construction result does not exist, which makes hard to distinguish between excellent techniques and average one. So that, it seems necessary to gain the security of construction and bring about technology competition through making an actual investigation to the enterprise standard of strengthening technology. This thesis presents operating program, and the certification standards of strengthening technology.
Adaptive Virtual Impedance of Grid-Tied Inverters to Enhance the Stability in a Weak Grid
Yan Du,Qingqing Sun,Xiangzhen Yang,Linbo Cui,Jian Zhang,Fei Wang 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.3
In a weak grid, especially with a grid-voltage proportional feedforward controller, the grid-tied inverter tends to interact with the grid impedance and thus suff ers from poor power quality and even instability. In order to improve the stability, serial-parallel virtual impedance based on the derivative controllers of grid current and voltage is proposed in this paper. With the aim of optimizing the performance of the inverter for a variety of grid impedance, these derivative coeffi cients are adaptively tuned by the constraint of a minimum leading phase which is determined by the phase margin and the current tracking response. With this proposed adaptive virtual impedance, the grid-tied inverter can operate stably under a wide variety of grid impedance and voltage harmonic rejection performance is also improved. Simulation and experimental results validate the eff ectiveness of the proposed method and design methodology.
Effect of Ga alloying on thermoelectric properties of InSb
Zhengliang Du,Xiaolu Chen,Junhao Zhu,Jiaolin Cui 한국물리학회 2018 Current Applied Physics Vol.18 No.8
As a potential thermoelectric (TE) material, the high lattice thermal conductivity and relatively low weighted mobility severely limit TE property optimization of InSb binary compound. In this paper, we substituted In of InSb with Ga and systematically investigated the effect of Ga alloying on the Seebeck coefficient, electrical conductivity and lattice thermal conductivity of InSb between 300 K and 770 K. We found that Ga alloying simultaneously reduced the lattice thermal conductivity and optimized the weighted mobility of InSb. The lattice thermal conductivity has been analyzed using Abeles model to gain more insight on the roles of Ga in In1-xGaxSb (x=0, 0.1, 0.15, 0.2) solid solution. The synergetic effect of Ga alloying on the electron and phonon transport leads to a marked enhancement in TE potential of InSb. The dimensionless figures of merit of InSb and In0.8Ga0.2Sb reach, respectively, 0.54 and 0.52 at 770 K.
최걸(Cui, Jie),오민호(Oh, Min-Ho),손창두(Son, Chang-Du),박선규(Park, Sun-Kyu),오광진(Oh, Kwang-Chin) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
Nowadays because of reification and diversification of the constructive technology and the constructive standards, there is no certification system of evaluation quality in material, design, and construction of strengthening. What’s more, the investigation system of the strengthening construction result does not exist, which makes hard to distinguish between excellent techniques and average one. So that, it seems necessary to gain the security of construction and bring about technology competition through making an actual investigation to the enterprise standard of strengthening technology. This thesis presents operating program, and the certification standards of strengthening technology.