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Effect of FeNi30 Powder Catalyst by Water Atomizing on Synthesis High-grade Diamond
Cheng Dong-kai,Ma Hong-qiu,Cao Dan,Ding Fu-chang 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
This paper described the preparation method for composing high-grade synthetic diamond by water atomizing using FeNi30 powder catalyst. The objective of this article is about powder making process using super high water atomizing in the atmosphere of inert gas, and then corroded the powder with a corrosion inhibitor. Finally, FeNi30 catalyst powder with lower oxygen content and good sphericity is produced. The experiment of making diamonds by using cubic press and the performance of the diamonds are also discussed.
The Influence of Hi-flux Powders Characteristics on the Performance of Magnetic Powder Cores
Zhao Tong Chun,Ma Hong Qiu,Ding Fu Chang 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The influence of Hi-flux powders characteristics on the performance of magnetic powder cores was studied. It was found that different cooling rate and nozzle configuration could change the shape and microstructure of powders. Smooth surface and spherical shape of powders were beneficial to improve DC bias performance and reduce core losses of magnetic powder core.
Meng-Ying Yao,Wei-Hong Zhang,Wen-Tao Ma,Qiu-Hong Liu,Li-Hua Xing,Gao-Feng Zhao 생화학분자생물학회 2019 Experimental and molecular medicine Vol.51 No.-
Currently, exosome-enclosed microRNAs (miRs) in exhaled breath have potential for biomarker discovery in patients with pulmonary diseases. This study was performed to investigate the roles of M2 macrophage-derived exosomes expressing miR-328 in pulmonary fibrosis (PF). Microarray-based analysis was used to screen differentially expressed genes (DEGs) and regulatory miRs in PF. The miR-target relationship between FAM13A and miR-328 was confirmed. The expression of FAM13A and miR-328 was measured in PF rats, and gain- and loss-of-function assays were conducted to determine the regulatory effects of FAM13A and miR-328 on PF. In addition, exosomes derived from M2 macrophages were isolated and then cocultured with pulmonary interstitial fibroblasts to identify the role of these exosomes in PF. Furthermore, the effects of M2 macrophage-derived exosomes overexpressing miR-328 on pulmonary fibroblast proliferation and the progression of PF were assessed in vivo. miR-328 might perform a vital function in PF by regulating FAM13A. FAM13A expression was downregulated while miR-328 expression was upregulated in rats with PF, and a miR-target relationship between miR-328 and FAM13A was observed. Additionally, miR-328 overexpression and FAM13A silencing each were suggested to promote pulmonary interstitial fibroblast proliferation and the expression of Collagen 1A, Collagen 3A and α-SMA. Then, in vitro experiments demonstrated that M2 macrophage-derived exosomes overexpressing miR-328 contributed to enhanced pulmonary interstitial fibroblast proliferation and promoted PF. Furthermore, in vivo experiments confirmed the promotive effects of M2 macrophagederived exosomes overexpressing miR-328 on the progression of PF. Collectively, the results showed that
Characteristics of Pre-alloyed Powders for Diamond Tools
Luo Xi-Yu,Ma Hong-Qiu,Kuang Xing,Huang Man,Tang Ming-Qiang 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
In this paper, the fundamental attributes, phase composition of three pre-alloyed powders for diamond tools by water atomization were investigated. The density, hardness, bend strength and bending modulus of their hot pressing samples were examined. The results showed that the three pre-alloyed powders have excellent low temperature sintering characteristics. The physical and mechanical properties of the samples were found to be nearly the same as those of fine cobalt powders.
Barnabas Oche,Lu Chen,Ya-ke Ma,Yue Yang,Chun-xiao Li,Xiao Geng,Li-zhen Qiu,Xiu-mei Gao,Hong Wang 대한약학회 2016 Archives of Pharmacal Research Vol.39 No.2
Phytoestrogens were widely used as natural alternatives to estrogen for treating cardiovascular diseases. They have been reported to have cardioprotective and antiinflammatory response, but the mechanisms remain unclear. In this study, we found cryptotanshinone and wogonin exhibited phytoestrogenic property in an estrogen- responsive reporter assay. In EA.hy926 cells, treatment of cryptotanshinone and wogonin led to significant increase in NO production levels, which were inhibited by co-incubation of estrogen receptor (ER)a antagonist methyl-piperidino-pyrazole (MPP). The expression of endothelial NO synthase (eNOS) and ERa were up-regulated with the same treatment, indicating they stimulate NO and eNOS expression via ERa-dependent pathway in endothelial cells. While in lipopolysaccharide activated vascular smooth muscle cell line A7r5, cryptotanshinone and wogonin exerted anti-inflammatory effects by inhibiting NO and inducible NO synthase expression via ERbdependent pathway. The reduction of NO synthesis was not affected by MPP, and was abrogated by ERb antagonist R,R-tetrahydrochrysene. Our findings provide the potential molecular mechanism of cryptotanshinone and wogonin as phytoestrogens for their cardioprotective effects, which exerted regulatory effects on NO synthesis through differential regulation of estrogen receptors. It can be employed as a basis for evaluating the beneficial effects of phytoestrogens in the treatment of patients at risk of cardiovascular disease.
Carbon-supported Ni nanoparticles for efficient CO <sub>2</sub> electroreduction
Jia, Mingwen,Choi, Changhyeok,Wu, Tai-Sing,Ma, Chen,Kang, Peng,Tao, Hengcong,Fan, Qun,Hong, Song,Liu, Shizhen,Soo, Yun-Liang,Jung, Yousung,Qiu, Jieshan,Sun, Zhenyu Royal Society of Chemistry 2018 Chemical Science Vol.9 No.47
<▼1><P>Carbon-coated Ni nanoparticles supported on N-doped carbon enable efficient electroreduction of CO<SUB>2</SUB> to CO comparable to single Ni sites.</P></▼1><▼2><P>The development of highly selective, low cost, and energy-efficient electrocatalysts is crucial for CO<SUB>2</SUB> electrocatalysis to mitigate energy shortages and to lower the global carbon footprint. Herein, we first report that carbon-coated Ni nanoparticles supported on N-doped carbon enable efficient electroreduction of CO<SUB>2</SUB> to CO. In contrast to most previously reported Ni metal catalysts that resulted in severe hydrogen evolution during CO<SUB>2</SUB> conversion, the Ni particle catalyst here presents an unprecedented CO faradaic efficiency of approximately 94% at an overpotential of 0.59 V, even comparable to that of the best single Ni sites. The catalyst also affords a high CO partial current density and a large CO turnover frequency, reaching 22.7 mA cm<SUP>–2</SUP> and 697 h<SUP>–1</SUP> at –1.1 V (<I>versus</I> the reversible hydrogen electrode), respectively. Experiments combined with density functional theory calculations showed that the carbon layer coated on Ni and N-dopants in carbon material both play important roles in improving catalytic activity for electrochemical CO<SUB>2</SUB> reduction to CO by stabilizing *COOH without affecting the easy *CO desorption ability of the catalyst.</P></▼2>
Chaomin Yin,Chen Li,Kun Ma,Xiuzhi Fan,Fen Yao,Defang Shi,Wenjing Wu,Jianhui Qiu,Guoyuan Hu,Hong Gao 한국식품과학회 2023 Food Science and Biotechnology Vol.32 No.7
In this study, the influence of γ-irradiation with different dose (0, 4, 8, and 16 kGy) on chemical composition, physicochemical features and bioactivities of polysaccharides extracted from Lentinula edodes (LEP) were investigated. The carbohydrate content (from 59.47 to 70.96%), the solubility, the ⋅OH and DPPH scavenging ability of LEP increased with the increased γ-irradiation dose, while the protein content, the weight-average and number-average molecular weight of LEP were significantly decreased with the increased γ-irradiation dose. Moreover, γ-irradiation treatment caused LEP color changes and surface topography destroyed. γ-Irradiated LEP showed higher hypoglycemic activities in vitro than that of non-irradiated LEP. Moreover, γ-irradiated LEP had better proliferation promoting effects on Lactobacillus rhamnosus and L. plantarum. These results showed that γ-irradiation treatment changes the physicochemical features of LEP, thus affects its antioxidant, hypoglycemic and prebiotic properties, which suggests that γ-irradiated LEP has potential application in the pharmaceutical industries and functional foods.
Xue-Song Sun,Di-Han Liu,Sai-Lan Liu,Qiu-Yan Chen,Shan-Shan Guo,Yue-Feng Wen,Li-Ting Liu,Hao-Jun Xie,Qing-Nan Tang,Yu-Jing Liang,Xiao-Yun Li,Jin-Jie Yan,Ming-Huang Hong,Jun Ma,Lin-Quan Tang,Hai-Qiang M 대한암학회 2019 Cancer Research and Treatment Vol.51 No.4
Purpose The purpose of this study was to investigate the survival trends and patterns of failure in patients with stage II nasopharyngeal carcinoma (NPC) treated with radiotherapy (RT) and chemotherapy over the last 20 years. Materials and Methods Thirty-eight hundred and eight patients diagnosed with stage II NPC between January 1990 and December 2012 were involved in this retrospective cohort study. All patients were treated with RT. According to the main imaging techniques and RT technology, we categorized these patients into four calendar periods: 1990-1996, 1997-2002, 2003-2007, and 2008-2012. Overall survival (OS), progression-free survival (PFS), locoregional relapse-free survival (LRFS), and distant metastasis–free survival (DMFS) were served as the clinical outcome. Results After a median follow-up period of 84.7 months, we observed increasing trends in survival and disease control. The 3- and 5-year OS rates increased from 87.1% and 78.7% in the first calendar period to 97.4% and 94.5% in the last calendar period, respectively (p < 0.001). Additionally, significant increasing trends could be seen in the PFS and LRFS during the four calendar periods. In the subgroup analysis, the LRFS in patients older than 50 years at diagnosis showed greater improvement than younger patients. However, the rate of distant metastasis was stable and relatively low, as the 5-year DMFS ranged from 90.5% to 94.7% among the four calendar periods. Conclusion The survival rates in patients with stage II NPC showed increasing trends from 1990 to 2012. The advance of RT provided excellent locoregional control and enhanced OS.