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Comparison of multiaxial fatigue damage models under variable amplitude loading
Hong Chen,De-Guang Shang,Yu-Jie Tian,Jian-Zhong Liu 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.11
Based on the cycle counting method of Wang and Brown and on the linear accumulation damage rule of Miner, four multiaxial fatigue damage models without any weight factors proposed by Pan et al., Varvani-Farahani, Shang and Wang, and Shang et al. are used to compute fatigue damage. The procedure is evaluated using the low cycle fatigue experimental data of 7050-T7451 aluminum alloy and En15R steel under tension/torsion variable amplitude loading. The results reveal that the procedure is convenient for engineering design and application, and that the four multiaxial fatigue damage models provide good life estimates.
Shang Jian,Liu Xiu,Bi Yanqing,Yan LiXia,Tian Cuiping,Guan Yu 대한독성 유전단백체 학회 2023 Molecular & cellular toxicology Vol.19 No.1
Background Breast cancer is one of the solid tumors investigated for gene expression. Objective Our research aimed to investigate the roles of transmembrane protein 106C (TMEM106C) on breast cancer and the underlying mechanisms. Results The results from GEPIA website indicated that TMEM106C was up-regulated in breast cancer and the TMEM106C over-expression was concerned with poor outcomes in breast cancer patients. Moreover, western blotting and qRT-PCR assay also showed that TMEM106C level was up-regulated in breast cancer cells. Our results showed that over-expression of TMEM106C accelerated the malignant phenotypes of MCF7 cells, while TMEM106C silencing displayed the opposite outcomes in MDA-MB-231 cells. Furthermore, TMEM106C over-expression activated PI3K/AKT/mTOR signaling, which reversed by Wortmannin. Similarly, TMEM106C silencing inhibited PI3K/AKT/mTOR signaling, which abolished by 740YP. Moreover, we also confirmed that 740Y-P significantly reversed the function of TMEM106C silencing on the malignant phenotypes of MDA-MB-231 cells. Conclusion This study indicated that TMEM106C could promote the malignant phenotypes of breast cancer cells by activating PI3K/AKT/mTOR signaling.
Shang, L.,Tian, P-Y.,Kim, N-J.,Chang, H. N.,Hahm, M. S. VCH VERLAGSGESELLSCHAFT 2009 CHEMICAL ENGINEERING AND TECHNOLOGY Vol.32 No.4
<P>Recombinant Escherichia coli has been studied as a main host for recombinant protein productions, but it is still difficult to cultivate E. coli in a large industrial-scale process due to the oxygen supply limitation. In this study, E. coli BL(21) harboring a new constructed plasmid (pEHUb-hGH) was used for producing recombinant human growth hormone (r-hGH) in 5-L and 30-L scale fermentors by supplying air and high purity oxygen, respectively, where the high purity oxygen was produced from a vacuum pressure swing adsorption (PSA). The impact of oxygen supply modes, i.e., air and high purity oxygen, on cell growth and r-hGH production was investigated in different scale fermentors. In the case of high purity oxygen supply, the final cell density and r-hGH concentrations were 63.0 and 4.8 g/L in the 5-L fermentor, 51.6 and 4.0 g/L in the 30-L fermentor, respectively. In addition, the productivity of r-hGH was doubled in the 5-L fermentor, and increased 4-fold in the 30-L fermentor, compared to the results obtained in the case of the air supply. The supply of high purity oxygen eliminated the oxygen limitation and acetate formation effectively, and apparently, did not affect the degradation of r-hGH. This shows that the recombinant E. coli cultivation with high purity oxygen produced from PSA may provide an effective method for large-scale industrial production of recombinant proteins.</P> <B>Graphic Abstract</B> <P>In the fed-batch culture of E. coli BL(21) for producing recombinant human growth hormone (r-hGH), the cell growth and r-hGH production are seen to be significantly improved by supplying high purity oxygen. This demonstrates that supplying high purity oxygen may be effective for carrying out large-scale, high cell density aerobic cultures. <img src='wiley_img/09307516-2009-32-4-CEAT200800481-content.gif' alt='wiley_img/09307516-2009-32-4-CEAT200800481-content'> </P>
Xiaolan Shang,Juan Du,Yuhan Zhao,Jiajia Tian,Shuhui Jiang 한국축산식품학회 2021 한국축산식품학회지 Vol.41 No.6
Fresh grass carp was used to produce surimi samples that were supplemented with 50 g/kg, 100 g/kg, or 150 g/kg pork back fat. The lipid composition, lipase activity, lipid oxidation index, and lipoxygenase activity of samples subjected to repeated freezethaw process were determined to assess the effects of the added fat on lipolysis and lipid oxidation of grass carp surimi. Freeze-thaw treatment increased free fatty acid content, mainly due to the decomposition of phospholipids and some neutral lipids by lipase. With repeated freeze-thaw treatment, the levels of free fatty acids and phospholipids were correlated with the lipid oxidation indexes and lipoxygenase activity, indicating that lipid degradation can promote lipid oxidation. In the same freeze-thaw cycle, surimi products with high fat content are more vulnerable to oxidative damage, neutral lipids are the main source of free fatty acids in the early stage of freeze-thaw, and phospholipids are the main source of free fatty acids in the late stage.
Chong Shang,Yun-Bao Ma,Yuan Wang,Xiao-Feng He,Tian-Ze Li,Ji-Jun Chen 대한약학회 2023 Archives of Pharmacal Research Vol.46 No.10
Artemongolins A–K (1–11), which are undescribed sesquiterpenoid dimers, were obtained from Artemisia mongolica and characterized through comprehensive spectral data, including HRESIMS, IR, 1D and 2D NMR, and ECD calculations. The absolute configurations of compounds 1, 4, and 7 were undoubtedly determined by a single-crystal X-ray crystallography. Artemongolins A–K (1–11) featured a rare 5/7/5/5/5/10 hexacyclic system composed of a germacrene and a guaianolide by a fused 2-oxaspiro[4,4]nonane-1-one ring system. Antihepatoma evaluation against three human hepatoma cell lines demonstrated that the most active compounds 5 and 6 displayed inhibitory activity with IC50 values of 88.6 and 57.0 (HepG2), 59.1 and 26.4 (Huh7), and 67.5 and 32.5 (SK-Hep-1) µM, respectively.
Chen, P.,Tian, Q.,Baek, S.J.,Shang, X.L.,Park, A.,Liu, Z.C.,Yao, X.Q.,Wang, J.Z.,Wang, X.H.,Cheng, Y.,Peng, J.,Shen, A.G.,Hu, J.M. WILEY‐VCH Verlag 2011 Laser physics letters Vol.8 No.7
<P><B>Abstract</B></P><P>Early and differential diagnosis of Alzheimer's disease (AD) is a problem that puzzled many doctors. Reliable markers in easy‐assembling samples are of considerable clinical diagnostic value. In this work, laser Raman spectroscopy (LRS) was developed a new method that potentially allows early and differential diagnosis of AD from the platelet sample. Raman spectra of platelets isolated from different ages of AD transgenic mice and non‐transgenic controls were collected and analyzed. Multilayer perceptron networks (MLP) classification method was used to classify spectra and establish the diagnostic models. For differential diagnosis, spectra of platelets isolated from AD, Parkinson’s disease (PD) and vascular dementia (VD) mice were also discriminated. Two notable spectral differences at 740 and 1654 cm<SUP>–1</SUP> were revealed in the mean spectrum of platelets isolated from AD transgenic mice and the controls. MLP displayed a powerful ability in the classifying of early, advanced AD and the control group, and in differential diagnosis of PD and advanced AD, as well as VD and advanced AD. The results suggest that platelet detecting by LRS coupled with MLP analysis appears to be an easy and accurate method for early and differential diagnosis of AD. This technique could be rapidly promoted from laboratory to the hospital. (© 2011 by Astro Ltd., Published exclusively by WILEY‐VCH Verlag GmbH & Co. KGaA) (© 2011 by Astro Ltd., Published exclusively by WILEY‐VCH Verlag GmbH & Co. KGaA)</P>
Ping Wang,Shang Gao,Xinliang Chen,Li Yang,Tian Cao,Bingyu Fan,Jin Liu,Xianhai Hu 한국고분자학회 2022 Macromolecular Research Vol.30 No.7
The polycaprolactone (PCL)-b-polyethylene glycol (PEG) oligomer (Oli) and its derivative containing ionic elements (ILs) were used as interfacial compatibilizers and regulators, and the polylactic acid (PLA)/PCL/Oli and PLA/PCL/ILs blends were prepared by solution blending. The effects of Oli and ILs on the phase interfacial properties, aggregated structure, crystallization and mechanical properties of PLA/PCL blends were systematically studied. The results show that the ILs with strong interfacial emulsification ability can improve the dispersion of PCL in PLA matrix, and enhance the two-phase interfacial adhesion. When the content of ILs is 5 %, ion clusters can form and alleviate the restricted crystallization of PCL, and promote the segment movement of PLA through the non-covalent bonding of ionic elements. So the crystallization ability of PLA and PCL improve simultaneously. ILs have a strong regulatory effect on the phase interfacial morphology and aggregated structure of PLA/PCL blends, and the PLA/PCL blends containing high content of 5 % ILs can significantly improve the mechanical properties of PLA/PCL blends.
Xu, Heng,Tian, Yan-Na,Dun, Bo-Ying,Liu, Hai-Tao,Dong, Guang-Kuo,Wang, Jin-Hua,Lu, Shang-Su,Chen, Bo,She, Jin-Xiong Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.11
A novel monoclonal antibody (mAb), known as AC10364, was identified from an antibody library generated by immunization of mice with human carcinoma cells. The mAb recognized proteins in lysates from multiple carcinoma cell lines. Cell cytotoxicity assays showed that AC10364 significantly inhibited cell growth and induced apoptosis in multiple carcinoma cell lines, including Bel/fu, KATO-III and A2780. Compared with mAb AC10364 or chemotherapeutic drugs alone, the combination of mAb AC10364 with chemotherapeutic drugs demonstrated enhanced growth inhibitory effects on carcinoma cells. These results suggest that mAb AC10364 is a promising candidate for cancer therapy.
생물학적 처리공정 내 AI(Ⅲ)계와 Fe(Ⅲ)계의 화학적 응집제 투입에 따른 인제거
전동걸 ( Dong Jie Tian ),임현숙 ( Hyun Sook Lim ),이준상 ( Joon Shang Lee ),전항배 ( Hang Bae Jun ) 충북대학교 산업과학기술연구소 2014 산업과학기술연구 논문집 Vol.28 No.1
This study compared the coagulation characteristics by coagulant through inputting A1(Ⅲ) and Fe(Ⅲ) to each unit process of biological sewage treatment processes. IN addition, this study attempted to derive the optimal operating conditions in consideration of economic feasibility. The input dose of coagulant for removal effective of phosphorus was found to be ranked in a descending order as follow: anaerobic > influent > anoxic > aerobic > effluent. In effluent with few or no suspended solids, the molar ratios for phosphors removal of A1(Ⅲ) and Fe(Ⅲ) were 1.2 and 1.24 respectively. These ratios were 15 or 20 times lower than those of anoxic and aerobic processes. The amount of sludge production was found to do ranked in a descending order as follows: anaerobic > anoxic > aerobic > influent > effluent, and this could be considered attributable to concentration of both suspended solids and phosphorus of each reactor. Thus, sludge was produced the most in anaerobic.