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The Effect of Mn/Al Substitution on the Structural Stability and Magnetic Properties of Mn₃AlC
Xin-You Wang,Ping-Zhan Si,Hui-Dong Qian,Yang Yang,Hong-Liang Ge,Jihoon Park,Xin-Qing Wang,Chul-Jin Choi 한국자기학회 2019 Journal of Magnetics Vol.24 No.1
The structural stability and magnetic properties of Mn3+xAl1-xC antiperovskite with varied Mn/Al substitution were studied systematically. Single phase Mn3+xAl1-xC alloys with antiperovskite structure were obtained in samples with x = −1/4, 0, 1/4, 1/2. An additional Mn23C₆ phase was precipitated from Mn3+xAl1-xC antiperovskite for x = 3/4 while Mn23C₆ phase was formed as major phase for x = 1. The mutual substitution of Mn and Al atoms has substantial effect on the Curie temperature and the saturation magnetization of the Mn3+xAl1-xC alloys. In comparison with the as-cast alloys, the as-annealed Mn3+xAl1-xC alloys exhibit reduced Mn/Al substitutions after high temperature homogenization, which enhances the ordering of Mn and Al atoms in the lattices. The Curie temperature of the homogenized Mn3+xAl1-xC increases with increasing Mn substitution to Al. The Mn₃AlC alloy shows the highest saturation magnetization among all samples with varied Mn/Al ratios. Most samples show zero coercivity and zero remanent magnetization. The maximum value of the magnetic entropy changes of Mn2.75Al1.25C at 285 K is 2.26 J/㎏ K in fields up to 3 T.
Xin Lv,Liheng Zhang,Sheng Zhan,Zhen Li,Yi Zeng 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.4
Highly dispersed Mn-Fe mixed metal oxides were supported on the nitric vapor functionalized carbon nanotubes (CNTs) by the polyol process for the low-temperature selective catalytic reduction (SCR) of NO with NH3. X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), H2 temperature-programmed reduction (H2-TPR) and Fourier transform infrared (FT-IR) spectroscopy have been used to elucidate the structure and surface properties of the obtained catalysts. It was found that the Mn-Fe/ VF-CNTs catalysts synthesized by the polyol process exhibited higher activity and more extensive operating-temperature window, compared to the catalysts prepared by the impregnation method. On the basis of the catalyst characterization, the better dispersion of metal oxides on the CNTs surface, the more chemisorbed oxygen species, the higher Mn4+/Mn and Oα/Oα+Oβ ratios played key roles in the excellent catalytic performance of the catalyst in the low-temperature SCR of NO to N2 with NH3.
Zhan, Hai-Lun,Gao, Xin,Zhou, Xiang-Fu,Pu, Xiao-Yong,Wang, De-Juan Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.3
Background: $FOXP3^+$ regulatory T cells (Tregs) inhibit effector T cell functions and are implicated in tumour progression. However, together with microvessel density (MVD) they remain controversial prognostic predictors for renal cell carcinoma (RCC), and potential associations have yet to be determined. The objective of this study was to determine the prognostic significance of Tregs and MVD and their potential relationship in RCCs. Design: Paraffin-embedded tissues from 62 RCC patients were analysed using immunohistochemistry to detect $FOXP3^+$ lymphocytes, and double immunohistochemistry to detect different microvessel types in the tumour interior, rim and normal kidney tissue, and their correlation with clinicopathological characteristics. Survival analysis was also performed. Results: The presence of $FOXP3^+$ cells in the tumour interior or the rim showed no correlation with death from RCC and other pathological characteristics. Negative correlations were noted between the immature MVD in the tumour interior or the rim and tumour size, tumour stage and overall survival; however, there was no correlation with the nuclear grade or pathological type. A positive correlation between $FOXP3^+$ Tregs and immature MVD (r=0.363, P=0.014) and mature MVD (r=0.383, P=0.009) was confirmed in the tumour interior. However, there was no correlation between $FOXP3^+$ Tregs and mature MVD (r=0.281, P=0.076) or immature MVD (r=0.064, P=0.692) in the tumour rim. Conclusions: In this study, a positive correlation between the presence of $FOXP3^+$ Tregs and immature and mature MVD in RCC was confirmed, which suggests a link between suppression of immunity, tumour angiogenesis and poor prognosis.
Zhan, Yi-Ping,Huang, Xin-En,Cao, Jie,Lu, Yan-Yan,Wu, Xue-Yan,Liu, Jin,Xu, Xia,Xiang, Jin,Ye, Li-Hong Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.10
Objective: To observe efficacy and side effects, as well as the impact on quality of life, of Kanglaite$^{(R)}$ (Coix Seed Oil) injections combined with chemotherapy in the treatment of advanced gastric cancer patients. Method: A consecutive cohort of 60 patients were divided into two groups: the experimental group receiving Kanglaite$^{(R)}$ Injection combined with chemotherapy and the control group with chemotherapy alone. After more than two courses of treatment, efficacy, quality of life and side effects were evaluated. Results: The response rate and KPS score of experimental group were significantly improved as compared with those of the control group (P<0.05). In addition, gastrointestinal reactions and bone marrow suppression were significantly lower than in the control group (P<0.05). Conclusions: Kanglaite$^{(R)}$ Injection enhanced efficacy and reduced the side effects of chemotherapy, improving quality of life of gastric cancer patients; use of Kanglaite$^{(R)}$ injections deserves to be further investigated in randomized control clinical trails.