A novel inverse opal zirconia pigment with controllable color saturation

Li-li Wang,Xin-xin Liu,Xiao-peng Li,Xiu-feng Wang,Li-na Feng,Xu-ri Hou 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.2

The inverse opal zirconia pigments were prepared by template method using polystyrene microspheres with the size of 340 ± 10nm as raw material and the in situ carbon was formed to achieve controllable and adjustable color saturation by sintering atvarious temperatures in nitrogen atmosphere with various nitrogen flow rates. The effects of nitrogen atmosphere, nitrogenflow rate and sintering temperature on the morphology, phase and color saturation of the inverse opal zirconia wereinvestigated. The results showed that when the inverse opal zirconia was sintered at 450 oC to 600 oC in nitrogen atmosphere,the green color saturation could be adjusted by changing the nitrogen flow rate from 0.2 L/min to 0.8 L/min. When thenitrogen rate was 0.8L/min, the green color saturation of the inverse opal zirconia could be adjusted by changing the sinteringtemperature from 450 oC to 600 oC. It indicated that the more the amount of in-situ carbon was generated, the more stray lightwas absorbed and the higher green color saturation of the inverse opal zirconia could be obtained. Further increasing thesintering temperature to 700 oC would destroy the inverse opal morphology of zirconia and affect the carbonization of theorganic component.

Nanocomposites of Fe2O3@rGO for adsorptive removal of arsanilic acid from aqueous solution

Li-Li Sui,Li-Na Peng,Hong-Bo Xu 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.3

Arsanilic acid (ASA), an organic-arsenic veterinary drug used widely, has greatly attracted attention due to its potential threats. We report the nanocomposites of the α-Fe2O3 nanoparticles growth on reduced graphene oxide (rGO) by a one-pot method. The α-Fe2O3 nanoparticles are densely covered on the surface of rGO according to the observations of transmission and scanning electron microscope. The adsorptive capacity (357.4±11.2 mg g1 ) of the Fe2O3@rGO nanocomposites for ASA, which was more than the sum of adsorptive capacities of the pure α-Fe2O3 nanoparticles and rGO, revealed a remarkable enhancement due to the synergetic effect of multiple interactions and the good dispersion of α-Fe2O3 nanoparticles with more active binding sites in the Fe2O3@rGO nanocomposites. The adsorption equilibrium of ASA onto the Fe2O3@rGO nanocomposites was achieved for 60 min, and the adsorption of ASA was dependent of pH and temperature, and independent of the concentration of humic acid ranging from 0 to 20 mg L-1 . After five cycles of adsorption-desorption, the adsorptive amounts of ASA by the regenerative sorbent still retained 85% of adsorptive amount by the fresh sorbents. The adsorption process of ASA can be described by the Langmuir and the pseudo-second-order equations and is exothermic and spontaneous according to thermodynamic analysis.

Theoretical and Numerical Analysis of 1 : 1 Main Parametric Resonance of Stayed Cable Considering Cable-Beam Coupling

Zhang, Li-Na,Li, Feng-Chen,Wang, Xiao-Yong,Cui, Peng-Fei Hindawi Limited 2017 Advances In Materials Science And Engineering Vol.2017 No.1

<P>For the 1 : 1 main parametric resonances problems of cable-bridge coupling vibration, a main parametric resonances model considering cable-beam coupling is developed and dimensionless parametric resonances differential equations are derived. The main parametric resonances characteristics are discussed by means of multiscale approximation solution methods. Using an actual cable of cable-stayed bridge project for research object, numerical simulation analysis under a variety of conditions is illustrated. The results show that when the coupling system causes 1 : 1 parametric resonance, nonlinear main parametric resonances in response are unrelated to initial displacement of the cable, but with the increase of deck beam end vertical initial displacement increases, accompanied with a considerable “beat” vibration. When the vertical initial displacement of deck beam end is 10−6 m order of magnitude or even smaller, “beat” vibration phenomenon of cable and beam appears. Displacement amplitude of the cable is small and considerable amplitude vibration may not occur at this time, only making a slight stable “beat” vibration in the vicinity of the equilibrium position, which is different from 2 : 1 parametric resonance condition of cable-bridge coupling system. Therefore, it is necessary to limit the initial displacement excitation amplitude of beam end and prevent the occurrence of amplitude main parametric excitation resonances.</P>

Knockdown of HMGN5 Expression by RNA Interference Induces Cell Cycle Arrest in Human Lung Cancer Cells

Chen, Peng,Wang, Xiu-Li,Ma, Zhong-Sen,Xu, Zhong,Jia, Bo,Ren, Jin,Hu, Yu-Xin,Zhang, Qing-Hua,Ma, Tian-Gang,Yan, Bing-Di,Yan, Qing-Zhu,Li, Yan-Lei,Li, Zhen,Yu, Jin-Yan,Gao, Rong,Fan, Na,Li, Bo,Yang, Jun Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.7

HMGN5 is a typical member of the HMGN (high mobility group nucleosome-binding protein) family which may function as a nucleosomal binding and transcriptional activating protein. Overexpression of HMGN5 has been observed in several human tumors but its role in tumorigenesis has not been fully clarified. To investigate its significance for human lung cancer progression, we successfully constructed a shRNA expression lentiviral vector in which sense and antisense sequences targeting the human HMGN5 were linked with a 9-nucleotide loop. Inhibitory effects of siRNA on endogenous HMGN5 gene expression and protein synthesis were demonstrated via real-time RT-PCR and western blotting. We found HMGN5 silencing to significantly inhibit A549 and H1299 cell proliferation assessed by MTT, BrdU incorporation and colony formation assays. Furthermore, flow cytometry analysis showed that specific knockdown of HMGN5 slowed down the cell cycle at the G0/G1 phase and decreased the populations of A549 and H1299 cells at the S and G2/M phases. Taken together, these results suggest that HMGN5 is directly involved in regulation cell proliferation in A549 and H1299 cells by influencing signaling pathways involved in cell cycle progression. Thus, our finding suggests that targeting HMGN5 may be an effective strategy for human lung cancer treatment.

Prognostic Value of PLCE1 Expression in Upper Gastrointestinal Cancer: a Systematic Review and Meta-analysis

Cui, Xiao-Bin,Peng, Hao,Li, Su,Li, Ting-Ting,Liu, Chun-Xia,Zhang, Shu-Mao,Jin, Ting-Ting,Hu, Jian-Ming,Jiang, Jin-Fang,Liang, Wei-Hua,Li, Na,Li, Li,Chen, Yun-Zhao,Li, Feng Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.22

Background: A number of studies have identified a shared susceptibility locus in phospholipase C epsilon 1 (PLCE1) for esophageal squamous cell carcinoma (ESCC) and gastric cardia adenocarcinomas (GCA). However, the results of PLCE1 expression in esophageal and gastric cancer remain inconsistent and controversial. Moreover, the effects on clinicopathological features remain undetermined. This study aimed to provide a precise quantification of the association between PLCE1 expression and the risk of ESCC and GCA through meta-analysis. Materials and Methods: Eligible studies were identified from PubMed, Wanfang Data, ISI Web of Science, and the Chinese National Knowledge Infrastructure databases. Using RevMan5.2 software, pooled odds ratios (ORs) with 95% confidence intervals (CIs) were employed to assess the association of PLCE1 expression with clinicopathological features relative to ESCC or GCA. Results: Seven articles were identified, including 761 esophageal and gastric cancer cases and 457 controls. Overall, we determined that PLCE1 expression was associated with tumor progression in both esophageal cancers (pooled OR=5.93; 95%CI=3.86 to 9.11) and gastric cancers (pooled OR=9.73; 95%CI=6.46 to 14.7). Moreover, invasion depth (pooled OR=3.62; 95%CI=2.30 to 5.70) and lymph node metastasis (pooled OR=4.21; 95%CI=2.69 to 6.59) were linked with PLCE1 expression in gastric cancer. However, no significant associations were determined between PLCE1 overexpression and the histologic grade, invasion depth, and lymph node metastasis in esophageal cancer. Conclusions: Our metaanalysis results indicated that upregulated PLCE1 is significantly associated with an increased risk of tumor progression in ESCC and GCA. Therefore, PLCE1 expression can be appropriately regarded as a promising biomarker for ESCC and GCA patients.

N-ACETYLGALACTOSAMINE BIOSENSOR BASED ON POLYDIACETYLENE NANOVESICLES: AN INDIRECTLY COLORIMETRIC RECOGNITION OF GALACTOSE-DEFICIENT IgA1

NA HAO,BO JIANG,PENG SUN,CHUANCHAO LI,Lili Liu,XIA LI,LU CHEN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.7

Immunoglobulin A nephropathy (IgAN) has been recognized as the most prevalent form ofglomerulonephritis with various histologic and clinical phenotypes in the world. The Gal-de¯cientIgA1 with terminally exposed GalNAc residue(s) plays a key role in the pathogenesis of thedisease. In this study, a novel colorimetric biosensor based on Helix aspersa agglutinin (HAA)absorbed on polydiacetylene (PCDA) nanovesicles for N-acetylgalactosamine (GalNAC) mo-lecular as core framework of Gal-de¯cient IgA1 recognition was investigated using the higha±nity between lectin HAA and GalNAC. The PCDA nanovesicles were prepared via UVcrosslinking. The size, morphology and elastic property of the nanovesicles were tested. Theoptimal concentration of HAA for the recognition of GalNAC via naked eyes observation was3 mM and the critical concentration of GalNAC for the sensitive color transition was 2 ? g/mL. This novel method has many advantages such as low prices, intuitive, real-time and easy to carryout and great potential in Gal-de¯cient IgA1 detection.

Calcination and sintering effects on the microstructure and dielectric properties of CaCu3Ti4O12 ceramics

Peng Liu,Lei Cao,Jian-Ping Zhou,Ya-Juan Wang,Li-Na Su,Cheng Liu,Huai-Wu Zhang 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.4

CaCu3Ti4O12 (CCTO) ceramics were fabricated by a conventional solid-state reaction at various calcination and sintering temperatures. Depending on the relative dielectric constant (εr) at 1 kHz, the specimens can be categorized into three types:type A (εr < 5 × 104), type B (5 × 104 < εr < 105) and type C (εr > 105). The value of εr is closely related to the microstructure:type-A specimens show a morphology with large grains embedded in a small-grained matrix, type-B specimens present a network structure and type-C specimens display a core-shell structure. Different dielectric loss variation tendencies are observed in the type-A specimens, which can be well explained by impedance spectroscopy analysis and further confirmed by the EDX results. Also, the proper calcination and sintering temperature ranges needed to achieve good comprehensive properties are given.

Potassium Acetate Blocks Clostridium difficile Toxin A-Induced Microtubule Disassembly by Directly Inhibiting Histone Deacetylase 6, Thereby Ameliorating Inflammatory Responses in the Gut

( Li Fang Lu ),( Dae Hong Kim ),( Ik Hwan Lee ),( Ji Hong ),( Peng Zhang ),( I Na Yoon ),( Jae Sam Hwang ),( Ho Kim ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.4

Clostridium difficile toxin A is known to cause deacetylation of tubulin proteins, which blocks microtubule formation and triggers barrier dysfunction in the gut. Based on our previous finding that the Clostridium difficile toxin A-dependent activation of histone deacetylase 6 (HDAC-6) is responsible for tubulin deacetylation and subsequent microtubule disassembly, we herein examined the possible effect of potassium acetate (PA; whose acetyl group prevents the binding of tubulin to HDAC-6) as a competitive/false substrate. Our results revealed that PA inhibited toxin A-induced deacetylation of tubulin and recovered toxin A-induced microtubule disassembly. In addition, PA treatment significantly decreased the production of IL-6 (a marker of inflamed tissue) in the toxin A-induced mouse enteritis model. An in vitro HDAC assay revealed that PA directly inhibited HDAC-6-mediated tubulin deacetylation, indicating that PA acted as a false substrate for HDAC-6. These results collectively indicate that PA treatment inhibits HDAC-6, thereby reducing the cytotoxicity and inflammatory responses caused by C. difficile toxin A.

Degradation of 1,4-dioxane by Newly Isolated Acinetobacter sp. M21 with Molasses as the Auxiliary Substrate

Peng Wang,Tingchen Cui,Yadong Yang,Jialu Li,Yaoming Su,Na Liu,Hong-Mei Li 한국생물공학회 2022 Biotechnology and Bioprocess Engineering Vol.27 No.3

The elimination of 1,4-dioxane (dioxane), a persistent organic pollutant, is a great challenge owing to its high hydrophilicity and chemical stability. Cometabolic bioremediation technology is an effective approach to remove many organic pollutants. Because of its eco-friendly and inexpensive properties, molasses is widely used as an auxiliary biomaterial to clean up compound-contaminated sites. In this study, a newly isolated bacterium Acinetobacter sp. M21 could effectively remove dioxane using molasses without any apparent lag phase. Under the optimized molasses dosage of 0.3%, M21 could remove 500 mg/L dioxane by 60.0 ± 2.8% within 20 days with a maximum dioxane degradation rate of 1.3 ± 0.2 mg-dioxane/L/h in the first day, and exhibited extraordinary dioxane tolerance up to 1,000 mg/L, while so high dose of dioxane negatively affected the cell growth. The degradation pathway of dioxane was also determined, and was supported by the detection of 2-hydroxyethoxyacetic acid as the key metabolite of dioxane. High level degradation activity of M21 to 20 mg/L dioxane was maintained over a variable of pH (5-11), temperatures (15-45°C), and salinities (up to 8%, as NaCl wt). This is the first report linking the cometabolism of dioxane and molasses by Acinetobacter sp. M21, a bacterium that shows great potential for field dioxane bioremediation.

Recent progresses and perspectives of VN-based materials in the application of electrochemical energy storage

Ling-Na Shi,Xue-Zhong Li,Lan-Tong Cui,Peng-Fei Wang,Ying Xie,Ting-Feng Yi 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-

Developing well-behaved electrode materials is crucial for manufacturing high-performance batteries,SCs and electrocatalysis, and it is also one of the main driving forces for the development of EES devices. In consideration of the high robustness and electrical conductivity during the electrochemical reactionprocess, VN-based materials exhibit good performance as electrode materials (or catalytic materials)for batteries, supercapacitors, and excellent catalytic activity for electrocatalysts. Especially, the VNbasedmaterials decorated into other active compounds with various morphologies elaborately presentexcellent performances due to the abundant active sites and fully synergistic effect. This review presentsthe structure-performance relation by designing different-dimensional nanostructures and various applicationsof VN-based materials in electrochemical energy storage (EES) applications. Finally, the perspectiveson future challenges and progress have been discussed. This review can offer a specificunderstanding for the optimization strategies of VN-based materials, thus booming the rapid developmentand practical applications for EES devices in the future.