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Qi Tang,Jun-Rong Yu,Lei Chen,Jing Zhu,Zu-Ming Hu 한국물리학회 2010 Current Applied Physics Vol.10 No.3
Poly(2-hydroxyethyl methacrylate)/poly(N-vinyl pyrrolidone) (PHEMA/PVP) double networks (DN) were prepared using a sequential method by incorporating a second network of crosslinked PVP into PHEMA. We found that the distributions of the two networks can be regulated just by modulating the morphology of the first network, thus giving expected high water content of these gels. Fourier transform infrared (FTIR) spectroscopy and scanning electronic microscopy (SEM) were used to confirm the structure of the DN. The incorporation of more hydrophilic PVP enhanced swelling ability of these gels. Because of improved hydrophilicity, the PHEMA/PVP DN exhibited higher loading capability for water-soluble substance than that of pure PHEMA, while showed a slower release rate than corresponding HEMA/NVP copolymer hydrogel. It is suggested that the DN gels are potential biomaterials for wound dressing, medical implants and other drug delivery systems.
Qi Tang,Jun-Rong Yu,Lei Chen,Jing Zhu,Zu-Ming Hu 한국물리학회 2011 Current Applied Physics Vol.11 No.3
Silicone hydrogels represent a series of novel materials designed for extensive applications especially in the biomedical field. In the current work, a method to obtain poly (dimethyl siloxane)/poly (2-hydroxyethyl methacrylate) (PDMS/PHEMA) interpenetrating polymer network (IPN) beads was developed. With further optimization, up to 43% PHEMA was incorporated into size controllable PDMS microspheres,offers an improved hydrophilicity and thus a reduced protein adsorption for long-term use. Furthermore, we found the PDMS/PHEMA IPN beads possess a hollow capsule-like structure, proposing their application as novel drug delivery vehicles. In vitro release studies have demonstrated two release patterns of these IPN beads for water-soluble drugs just by modulating the drug concentration, suggesting their possible applications in different delivery systems.
Jing Zhu,Jun-xia Yu,Jia-dong Chen,Jie-sen Zhang,Jia-qi Tang,Yuan-lai Xu,Yue-fei Zhang,Ru-an Chi 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.6
A modified sugarcane bagasse (SCB) fixed bed column was used to remove Pb2+ from aqueous solution. To determine the optimal condition for Pb2+ separation, Ca2+ was chosen as the model interfering ion, and effects of Ca2+ and Pb2+ initial concentration ratio (C0 Ca : C0 Pb) on the adsorption of Pb2+ were investigated. Results showed that adsorption amount ratio of Ca2+ and Pb2+ (qe Ca : qe Pb) had a good linear relationship with C0 Ca : C0 Pb. Mass ratio of Pb2+ absorbed on the modified SCB was higher than 95% at C0 Ca : C0 Pb<1.95, illustrating that Pb2+ could be selectively removed from aqueous solution. To verify that, simulated waste water containing co-ions of K+, Na+, Cd2+ and Ca2+ was treated, and results showed that the equilibrium amount of Pb2+, K+, Na+, Cd2+ and Ca2+ adsorbed was 134.14, 0.083, 0.058, 1.28, and 1.28mg g−1, respectively, demonstrating that the modified SCB could be used to remove Pb2+ from aqueous solution in the investigated range.
Jun Zhu,Yao Li,Ying-Ying Tang,Jian-Qi Liu,Yi-Yu Chen,Zhongxian LV,Fang Liu 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.1
The Hemipteran predator, Cyrtorhinus lividipennis, feeds on the eggs and nymphs of rice planthoppers and leafhoppers. We previously demonstrated that sublethal concentrations of imidacloprid stimulated the reproduction of C. lividipennis. Considering the essential roles of juvenile hormone (JH) in insect reproduction, we speculated that sublethal concentrations of imidacloprid may stimulate the reproduction of C. lividipennis by regulating JH level. To test this, we cloned C. lividipennis JH acid methyl transferase (ClJHAMT) and JH esterase (ClJHE), which are responsible for JH biosynthesis and degradation genes, respectively. We then knocked down ClJHAMT by injecting dsRNA into C. lividipennis nymphs and found that emerging female adults exhibited 88.8% lower expression of the vitellogenin gene (ClVg) and the number of eggs was reduced by 41.5% as compared with controls. Silencing ClJHE increased ClVg mRNA expression by 275.0% but did not affect fecundity. A sublethal concentration of imidacloprid (LC 20 ) increased the JH titer in females by 35.3% and 60.6% at 24 and 48 h post-emergence, respectively. In treatments containing both imidacloprid and dsJHAMT, the silencing of CLJHAMT reduced the number of eggs produced by adult females by 21.4% as compared to the control (imidacloprid + dsGFP). Our results indicated that sublethal concentration of imidacloprid may induce C. lividipennis reproduction by upregulating JH level via JHAMT. The finding could provide valuable information for improved integration of C. lividipennis and insecticides in pest management.
Optimization of optical modulation in amorphous WO3 thin films
Jiangbin Su,Xiumei Zhu,Longlong Chen,Yu Liu,Hao Qi,Zuming He,Bin Tang 대한금속·재료학회 2024 ELECTRONIC MATERIALS LETTERS Vol.20 No.2
WO 3 thin fi lms were prepared on indium-tin oxide (ITO) glass substrates at diff erent substrate temperature by radiofrequency magnetron sputtering. Then the fi lms were soaked in fi ve organic solvents of acetone, ethanol, cyclohexane,acetonitrile and ethyl acetate for 48 h, respectively. The changes in the microstructure, surface morphology and electrochromic(EC) properties of WO 3 thin fi lms before and after the immersion treatment were systematically studied. It wasfound that after soaking in ethanol, the optical modulation of amorphous WO 3 thin fi lms deposited at room temperatureincreased from 50 to 85%, showing excellent EC performance. Moreover, the immersion treatment in ethanol is also helpfulfor improving the EC properties of amorphous WO 3 thin fi lms prepared at elevated substrate temperature. However,after immersion in the other organic solvents, the optical modulation of WO 3 thin fi lms increased less (for acetone: 77%)or even decreased signifi cantly (for cyclohexane, acetonitrile and ethyl acetate: 31%, 30% and 35%, respectively). In addition,the immersion treatment in ethanol cannot improve the optical modulation of crystalline WO 3 thin fi lms prepared at600 °C, which dropped from 58 to 40%. The authors believe that this is mainly related to the diff erent dredging eff ects ofvarious organic solvents on the transport channels of Li-ions and electrons in WO 3 thin fi lms. Therefore, this work providesa new approach for the optimization of EC performance of amorphous WO 3 thin fi lms.
Yongan Yang,Yuangang Wei,Xiaonan Guo,Pengfei Qi,Hailiang Zhu,Wenjian Tang 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.4
Glycyrrhetic acid monoglucuronide (GAM) isobtained from the natural sweetener glycyrrhizin throughenzymolysis. Its sweetness concentration–response (C–R)behavior in room-temperature in water was determinedusing two-alternative forced choice discrimination tests. The C–R equation of resultant hyperbolic curve relatingsucrose equivalent (SE, %) to GAM concentration([GAM], mg/L) was SE = 19.6 9 [GAM]/(194.8 ? [GAM]). From the C–R function, Pw (2) ofGAM, relative to a 2% (w/v) sucrose reference, is morethan 900, which has much higher potency than its precursorglycyrrhizin. Molecular modeling showed that GAM isfinely bound into protein 1EWK through conventionalhydrogen bonds, p-Alkyl interactions and Van der Waalsbonds, which exhibited better protein inclusion than Glycyrrhizin. Thus, GAM could be developed
Zhuo, Wen-Lei,Zhang, Liang,Xie, Qi-Chao,Zhu, Bo,Chen, Zheng-Tang Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.24
Background: Lapatinib, a dual tyrosine kinase inhibitor that interrupts the epidermal growth factor receptor (EGFR) and HER2/neu pathways, has been indicated to have significant efficacy in treating HER2-positive breast cancer. However, acquired drug resistance has become a very serious clinical problem that hampers the use of this agent. In this study, we aimed to screen small molecule drugs that might reverse lapatinib-resistance of breast cancer by exploring differentially expressed genes (DEGs) via a bioinformatics method. Materials and Methods: We downloaded the gene expression profile of BT474-J4 (acquired lapatinib-resistant) and BT474 (lapatinib-sensitive) cell lines from the Gene Expression Omnibus (GEO) database and selected differentially expressed genes (DEGs) using dChip software. Then, gene ontology and pathway enrichment analyses were performed with the DAVID database. Finally, a connectivity map was utilized for predicting potential chemicals that reverse lapatinib-resistance. Results: A total of 1, 657 DEGs were obtained. These DEGs were enriched in 10 pathways, including cell cycling, regulation of actin cytoskeleton and focal adhesion associate examples. In addition, several small molecules were screened as the potential therapeutic agents capable of overcoming lapatinib-resistance. Conclusions: The results of our analysis provided a novel strategy for investigating the mechanism of lapatinib-resistance and identifying potential small molecule drugs for breast cancer treatment.
Impact of a Glyphosate-Tolerant Soybean Line on the Rhizobacteria, Revealed by Illumina MiSeq
( Gui-hua Lu ),( Yin-ling Zhu ),( Ling-ru Kong ),( Jing Cheng ),( Cheng-yi Tang ),( Xiao-mei Hua ),( Fan-fan Meng ),( Yan-jun Pang ),( Rong-wu Yang ),( Jin-liang Qi ),( Yong-hua Yang ) 한국미생물 · 생명공학회 2017 Journal of microbiology and biotechnology Vol.27 No.3
The global commercial cultivation of transgenic crops, including glyphosate-tolerant soybean, has increased widely in recent decades with potential impact on the environment. The bulk of previous studies showed different results on the effects of the release of transgenic plants on the soil microbial community, especially rhizosphere bacteria. In this study, comparative analyses of the bacterial communities in the rhizosphere soils and surrounding soils were performed between the glyphosate-tolerant soybean line NZL06-698 (or simply N698), containing a glyphosate-insensitive EPSPS gene, and its control cultivar Mengdou12 (or simply MD12), by a 16S ribosomal RNA gene (16S rDNA) amplicon sequencing-based Illumina MiSeq platform. No statistically significant difference was found in the overall alpha diversity of the rhizosphere bacterial communities, although the species richness and evenness of the bacteria increased in the rhizosphere of N698 compared with that of MD12. Some influence on phylogenetic diversity of the rhizosphere bacterial communities was found between N698 and MD12 by beta diversity analysis based on weighted UniFrac distance. Furthermore, the relative abundances of part rhizosphere bacterial phyla and genera, which included some nitrogen-fixing bacteria, were significantly different between N698 and MD12. Our present results indicate some impact of the glyphosate-tolerant soybean line N698 on the phylogenetic diversity of rhizosphere bacterial communities together with a significant difference in the relative abundances of part rhizosphere bacteria at different classification levels as compared with its control cultivar MD12, when a comparative analysis of surrounding soils between N698 and MD12 was used as a systematic contrast study.