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Ming‑Wei Wu,Jhewn‑Kuang Chen,Mo‑Kai Tsai,Pei Wang,Tien‑Lin Cheng,Bo‑Huan Lin,Po‑Hsing Chiang,Annadurai Dhinakar 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.1
The selective laser melted (SLM) Ti–6Al–4V cellular solid is a promising material in biomedical and other applications. The mechanical properties of the SLM Ti–6Al–4V cellular material are predominantly controlled by the design of the cellular structure. The objective of this study was to investigate the uniaxial compressive properties and compressive fatigueperformance of the SLM Ti–6Al–4V cellular solid with a new cuboctahedron unit cell reinforced by four diagonal strutsand two horizontal struts along the X and Y axes. The infuences of hot isostatic pressing (HIP) on the various mechanicalproperties were also examined. The results showed a smoother stress–strain curve and fewer stress oscillations in the HIPspecimen than in the SLM specimen. The HIP process slightly decreased the yield strength of the SLM sample from 55 to52 MPa. Under uniaxial compressive stress, the SLM and HIP specimens exhibited layer-by-layer fracture and diagonalshear fracture, respectively. Furthermore, the HIP treatment signifcantly increased the fatigue performance and improved thefatigue endurance ratio at 106cycles from 0.15 to 0.35. The HIP treatment contributed to several positive efects, includingphase transformation from brittle α′ to α + β, the elimination of strut porosity and residual stress, an increase in lath size,and a better combination of strength and ductility, thereby improving the fatigue performance. The efects of stress mode onthe fracture mechanism were also clarifed using in situ observation in combination with digital image correlation.
Kuo, Yuh-Chi,Wu, Chia-Lin,Tasi, Wei-Jern,Wang, Jir-Yenn,Chang, Shi-Chung,Lin, Ching-Yuang,Shiao, Ming-Shi 경희대학교 동서의학연구소 1999 INTERNATIONAL SYMPOSIUM ON EAST-WEST MEDICINE Vol.1999 No.1
Yuh-Chi Kuo¹,Chia-Lin Wn¹,Wei-jern Tasi¹,Jir-Yenn Wang²,Shi-Chung Chang₃,Ching-Yung Lin⁴,and Ming-Shi Shiao⁴¹National Research Institute of Chinese Medicine, ²Department of Biology,Fu Jen University, ³Department of Chest, ⁴Department of Pediatrics, □De[art,amt of Medical Research and Education. Taipei Veterans General Hospital, Taipei, Taiwan Yuh-Chi Kuo¹,Chia-Lin Wn¹,Wei-jern Tasi¹,Jir-Yenn Wang²,Shi-Chung Chang²,Ching-Yung Lin³,and Ming-Shi Shiao⁴.¹National Research Institute of Chinese Medicine, ²Department of Biology,Fu Jen University, ³Department of Chest, ⁴Department of Pediatrics, □De[art,amt of Medical Research and Education. Taipei Veterans General Hospital, Taipei, Taiwan. Blocking of Cell Proliferation, Cytokines Production and Genes Expression Following Administration of Cordyceps sinensis in the Bronchoalveolar Lavage Fluids Cells. Proceedings of international Symposium on East-West Medicine, Seoul. 44-64, 1999.-Cordyceps sinensis is a major parasitic fungus on larva of Lepidoptera. It is one of the well know fungi used in traditional Chinese medicine for treatment asthma, lung and kideney diseases. Many fungi belonging to the genus Cordyceps have been demonstrated to produce natural products with various biological activities. Reported biological activities of genus cordyceps include:(a)inhibition of DNA and RNA synthesis;(b)enhancement of cell differentiation;(c)restruction of cytoskeleton;(d)inhibition of protein kinase activity;(e)antitumor activity on bladder, colon, lung carcinoma as well as fibroblastoma;(f)inhibition of the infection and revers transciptase activity of human immunodeficiency virus type 1; and(g) inhibition of methylation of nucleic acid. Thus, it is suggested that the extracts of Cordyceps sp. Contain antitumor, antiviral, and many other biological activities. In our previous studies, we proved that C. sinensis contains the antitumor and immunomodulatory agents. In the present studies, effects of C. sinensis on bronchoalveolar lavage fluids(BAL)cells were demonstrated. The crude methanolic extracts of C. sinensis were fractionated into 15 fractions by silica gel column chromatography. Effects of various fraction on BAL cells proliferation and lipopolysaccharide(LPS) stimulated interleukin-1β(IL-8),platelet activating factor(PAF), interleukin-6(IL-6), tumor necrosis factor-α(TNF-α),and interleukin-8(IL-8) production on BAL cells were determined. The result indicated that the CS-19-22 fraction suppressed BAL cells proliferation activated by LPS. The median inhibitory concentration(IC50) was 6㎍/ml. The CS-19-22 fraction also decreased IL-1β,PAF,IL-6, TNF-αand IL-8 production.The results of revers transcription-polymerase chain reaction(RT-PCR) demonstrated that the CS-19-22 fraction did not affect IL-1β,PAF,IL-6, TNF-α,and IL-8 mRNAs expression in BAL cells activated by LPS. By contrast, it inhibited the IL-10 mRNA expression but enhanced IFN-γand IL-12 mRNAs expression in activated BAL cells. Moreover, the CS-19-22 fraction blocked PAF-induced platelet aggregation. It is unlikely that cytotoxicity was involved. Because no cell deths were observable. We hypothesize that inhibitory mechanisms of CS-19-22 on BAL cells proliferation may be related to the impairments of gene expression and production of cytokines in BAL cells. The explanation of C. sinensis antiasthma function may involved the following(1)C.sinenesis contained immunomodulatory agents that stimulated IFN-γand IL-12 expression in TH1cells.(2)Enhanced secretion of IFN-γand IL-12 will inhibit the Tγcells immune responses Ex. Decreasing of IL-6 and IL-10 production.(3) The impairments of cytokines production in TH2 cells suppressed th BAL cells proliferation then more cytokines production Ex.IL-1β,PAF,IL-6,TNF-αand IL-8 in activated BAL cells were decreased. (4)The suppression of TH2cells immune responses will inhibit the growth and differentiation of B cells then IgE production will be decreased. (5)Reduced production of IgE will decreased asthma attack occurring in individuals. However, the results of the present study suggested that C. sinensis may also have acted to treat asthma in part by inhibiting BAL cells proliferation and cytokine gene expression and production. Future, experiments with treatment of animals with asthma with C. sinensis will be necessary to defined whether C. sinensis can reduce asthma injury. Plans are underway for the isolation of pure principal growth inhibitors and their mechanisms of action are subjected for further study.
Ming Zhao,Ming Zhao,Bin Tong,Zinan Kang,Yanfang Wu,Wei Ding,Baoming Feng 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.5
The synthesis of PdP nanoparticles (NPs) using triphenylphosphine as a phosphorus precursor was investigated. The electrocatalytic performance of PdP NPs in hydrogen evolution reaction in an alkaline medium was measured. It can be concluded that when the current density is 10 mA cm -2, the overpotential produced by Pd3P0.95 NPs is 75mV which is 185mV lower than that produced by commercial Pd/C. The mass activity of Pd3P0.95 NPs is more than twice as high as that of commercial Pd/C. The work indicates that PdP nanomaterials could be a potential catalyst for water splitting.
Ming-Cheng Wu,Kuang-Hui Lu 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.3
The juvenile hormone titer during the last instar is a crucial determining switch for metamorphosis inlepidopterans.Wepreviously observed that the induction of glutathione S-transferase (GST) activity by a juvenilehormone analog (JHA) is reversely proportional to the occurrence of JHA-induced supernumerary instarsfollowing topical application of JHA to Spodoptera litura during the last instar period. In this paper, at least fiveJHA-induced GSTs were purified by glutathione-affinity chromatography, and one was further isolated fordetermination of the N-terminal sequence. The corresponding cDNA was cloned and named SlGST1 (GenBankaccession no. AY506545). SlGST1 was classified into the epsilon class of GSTs by phylogenetic analysis. Northernblot analyses further showed that the SlGST1 in fat bodies can be induced by JHA, particularly in 0-day-old sixthinstarlarvae, in which induction was much higher than that in 1- and 2-day-old sixth-instar larvae. To ourknowledge, this is the first JHA-inducible GST to have been identified, and we believe that it will provide newinsight into the role of GST in insect development, particularly during metamorphosis.