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Molecule-based electrorheological material assembled using β-cyclodextrin as substrate
Yan-Li Shang,Yun-Ling Jia,Yun Ma,Jun-Ran Li,Shao-Hua Zhang,Ming-Xiu Li 한국유변학회 2010 Korea-Australia rheology journal Vol.22 No.1
Molecule-based electrorheological (ER) materials as a novel type of ER materials, the inclusion compound [H2(β-CD-A)-PTA] between p-toluenesulfonic acid (PTA, guest) and H2(β-CD-A) (host) that is dicarboxylic acid of β-cyclodextrin (β-CD) , and the rare earth (RE) complexes [(β-CD-A)-PTA]3RE2 (RE=La, Gd, Y)of H2(β-CD-A)-PTA, were synthesized. The ER performance and dielectric property of the materials were studied. Our results show that the molecule-based ER materials assembled using β-cyclodextrin as a substrate,especially the inclusion compound and its rare earth (RE) complexes exhibit clear ER effect. The inclusion PTA can markedly enhance the ER performance of H2(β-CD-A) material. The ER activity of the yttrium complex is the highest among these materials. The characteristic of the molecule in molecule-based ER materials is an important factor in influencing ER property.
Contributed Mini Review : Isoforms, structures, and functions of versatile spectraplakin MACF1
( Li Fang Hu ),( Pei Hong Su ),( Run Zhi Li ),( Chong Yin ),( Yan Zhang ),( Peng Shang ),( Tuan Min Yang ),( Ai Rong Qian ) 생화학분자생물학회(구 한국생화학분자생물학회) 2016 BMB Reports Vol.49 No.1
Spectraplakins are crucially important communicators, linking cytoskeletal components to each other and cellular junctions. Microtubule actin crosslinking factor 1 (MACF1), also known as actin crosslinking family 7 (ACF7), is a member of the spectraplakin family. It is expressed in numerous tissues and cells as one extensively studied spectraplakin. MACF1 has several isoforms with unique structures and well-known function to be able to crosslink F-actin and microtubules. MACF1 is one versatile spectraplakin with various functions in cell processes, embryo development, tissue-specific functions, and human diseases. The importance of MACF1 has become more apparent in recent years. Here, we summarize the current knowledge on the presence and function of MACF1 and provide perspectives on future research of MACF1 based on our studies and others. [BMB Reports 2016; 49(1): 37-44]
Preparation of N-Doped Graphene by Hydrothermal Method and Interpretation of N-Doped Mechanism
Yan Shang,Huizhu Xu,Mingyue Li,Guiling Zhang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.2
Nitrogen-doped graphene (NG) was generated by hydrothermal method, using GO as the raw material and formamide as the reducing-doping source. The composite material was characterized by Fourier transform infrared (FTIR) spectrum, X-ray diffraction (XRD) spectrum, X-ray photoelectron spectroscopy (XPS). The results showed that Nitrogen was successfully doped in the graphene. Through regulating the reaction temperature, time and the ratio of graphite oxide and formamide, the different nitrogen contents were obtained, the highest nitrogen content was 5.67%. NG was also synthesized by urea or ammonia, characterizing by XPS. The characterization results showed that for taking urea and ammonia as nitrogen source, pyrrolic-N was the main form of nitrogen existing, taking formamide as a nitrogen, pyridinic-N was the main form of nitrogen existing. Based on these experimental results by different nitrogen source, the N-doped graphene mechanism was interpreted.
Miao Shang,Yan Li,Kuangyu Chen,Mingshun Yang,Xingbai Zhao,Kaixin Nie 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.12
The incremental forming technology has enormous potential in manufacturing sheet parts. However, non-uniform thickness distribution is a common technical existing issue in forming thin-walled parts using this technology. The use of hydraulic supports has been a realistic, promising solution to this issue. Based on hydraulically-supported incremental forming technology, a variety of strategies were proposed in this article for hydrostatic and variable pressure supports respectively. For each supporting strategy, the thickness distribution and materials flow laws in various forming regions were explored. Experimental and simulation results indicate that when the hydraulic pressure is less than 1.8 bar, the thickness distribution of the hydrostatic-supports is significantly better than that of conventional incremental forming, and the thickness distribution of the variable-pressure supports may be better than that of the hydrostatic-support. The hydraulically-supported incremental forming technology has an potential of enhancing enhance the thickness distribution performance and forming performance of thin-walled parts.
Synthesis, Antibacterial Activity, and Structure–Activity Relationship of Fusaric Acid Analogs
Qing-Yan Zhang,Yang Fei‐Yu,Liao Shang‐Gao,Wang Bing,Li Rui,Dong Yong‐Xi,Zhou Meng,Yang Yuan‐Yong,Xu Guo‐Bo 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.4
Forty-one fusaric acid analogs possessing a pyridine carboxylic acid scaffold have been synthesized. The antibacterial activity results demonstrated that compounds 5b, 7b, 8c, and 8d displayed strong antibacterial activities against Staphylococcus aureus ATCC25923 with minimum inhibitory concentrations (MICs) of 4–16 μg/mL. Molecular docking study indicated that these compounds have strong hydrogen-bonding interactions with TyrRS. Meanwhile, 8c and 8d showed promising antibacterial activities against Pseudomonas aeruginosa ATCC9027. Compound 4 exhibited pronounced antibacterial activities against a clinically isolated multidrug-resistant strain of Escherichia coli (MIC: 64 μg/mL as compared 64 μg/mL of levofloxacin and 1024 μg/mL of ceftriaxone sodium). Moreover, compound 17e displayed strong synergistic antibacterial effect with levofloxacin against the multidrug-resistant strain, decreasing the MIC value of levofloxacin to 1/16 of its original MIC. No obvious cytotoxic activities against LO2 was observed for compounds 4, 5b, 8c, 8d, 17d, and 17e at 50 μM. The preliminary structure–activity relationship of fusaric acid analogs was also discussed.
PROGRAMMABLE INDUCTANCE AND CAPACITANCE GENERATOR
Hua, Shang Qing,Hua, Wu Li,Sheng, Qu Yan,Jian, Ma Huai 대한전자공학회 1992 HICEC:Harbin International Conference on Electroni Vol.1 No.1
This paper introduces an impedance converter principle of simulated pure inductance and capacitance by using operational amplifiers, in addition, it provides the circuitry configurations according to this principle. The generator can produce equivalent inductance from 0.1H to 6553500H or equivalent capacitance from 10^(-10) F to 65535 × 10^(-7) by programming control. Its circuit is very simple, this generator can be programmed control conveniently and integrated easily. It especially has certain advantages in simulating large inductance or capacitance and programming control.
Jing Shang,Wen Wang,Jun Feng,Guo-gang Luo,Ying Dang,Jian Sun,Yan-qiu Yang,Li-tao Ruan 대한영상의학회 2018 Korean Journal of Radiology Vol.19 No.1
Objective: To ascertain the feasibility of using shear wave velocity (SWV) in assessing the stiffness of carotid plaque by supersonic shear imaging (SSI) and explore preliminary clinical value for such evaluation. Materials and Methods: Supersonic shear imaging was performed in 142 patients with ischemic stroke, including 76 males and 66 females with mean age of 66 years (range, 45–80 years). The maximum, minimum, and mean values of SWV were measured for 129 carotid plaques. SWVs were compared between echolucent and echogenic plaques. Correlations between SWVs and serum homocysteine levels were investigated. Based on neurological symptom, the surrogate marker of vulnerable plaque (VP), binary logistic regression was performed and area under curve (AUC) of homocysteine only and homocysteine combing SWVmean was calculated respectively. Results: Echogenic plaques (n = 51) had higher SWVs than echolucent ones (n = 78) (SWVmin 3.91 [3.24−4.17] m/s vs. 1.51 [1.04−1.94] m/s; SWVmean, 4.29 [3.98−4.57] m/s vs. 2.09 [1.69−2.41] m/s; SWVmax, 4.67 [4.33−4.86] m/s vs. 2.62 [2.32−3.31] m/s all p values < 0.01). Pearson correlation analysis showed that stiffness of plaques was negatively correlated with homocysteine level. R values for SWVmin, SWVmean, and SWVmax were -0.205, -0.213, and -0.199, respectively. Binary logistic regression analysis showed that sex (p = 0.008), low-density lipoprotein (p = 0.015), triglycerides (p = 0.011), SWVmean (p = 0.004), and hyper-homocysteinemia (p = 0.010) were significantly associated with symptomatic ischemic stroke. Receiver operating characteristic curves revealed that SWVmean combing serum homocysteine level (AUC = 0.67) presented better diagnostic value than serum homocysteine only (AUC = 0.60) for symptomatic ischemic stroke. Conclusion: Supersonic shear imaging could be used to quantitatively evaluate stiffness of both echolucent and echogenic carotid plaques. More importantly, SWVs of plaques were not only correlated to serum homocysteine level, but also associated with symptomatic ischemic stroke, suggesting that SSI might be useful for understanding more about VP.
Xiaolan Shang,Xunyou Yan,Qiuling Li,Zizheng Liu,Anguo Teng 한국축산식품학회 2020 한국축산식품학회지 Vol.40 No.6
Fresh grass carp was used to produce surimi and 50 g/kg, 100 g/kg, or 150 g/kg pork back fat was added. The water distribution, thiobarbituric acid reactive substances (TBARS), myoglobin oxidation, color parameter (L*, a*, and b*), heme and non-heme iron content of samples were determined to analyze the effects of different fat content on the oxidation of myoglobin and lipids during multiple freeze-thaw cycles of grass carp surimi. Both multiple freeze-thaw cycles and increased fat content lead to an increase in TBARS, a blue shift in the absorption peak of myoglobin porphyrin, a decrease in heme iron content, and an increase of non-heme iron content. Repeated freeze-thaw caused a decrease in immobilised water content and L*, and caused an increase in a* and b*. Increased fat content caused an increase in immobilised water content, L* and a*, and caused a decrease in b*.
Xiaoxiang Han,Shang-Bin Liu,Wei Yan,Chin-Te Hung,Yanfei He,Pei-Hao Wu,Li-Li Liu,Shing-Jong Huang 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.7
A series of Brønsted-Lewis acidic ionic liquid (BLAIL) catalysts consisting of sulfonated ionic liquid [SO3H-pmim]Cl and Sn(II) chloride have been synthesized and exploited for catalytic transesterification of soybean oil with methanol to biodiesel. The structural and chemical properties of these [SO3H-pmim]Cl-xSnCl2 (x=0-0.8) catalysts were characterized by different analytical and spectroscopic techniques, such as FT-IR, TGA, and NMR. In particular, their acid properties were studied by solid-state 31P NMR using trimethylphosphine oxide as the probe molecule. The BLAIL catalysts were found highly efficient for transesterification reaction due to the introduction of Lewis acidity by SnCl2 in the initially Brønsted acidic [SO3H-pmim]Cl catalyst. The effects of three independent process variables on biodiesel yield were optimized by response surface methodology (RSM). Consequently, an excellent biodiesel yield of 98.6% was achieved under optimized reaction conditions over the BLAIL catalyst with SnCl2 loading (x) of 0.7.