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| 1 | Controlled synthesis of single cobalt atom catalysts via a facile one-pot pyrolysis for efficient oxygen reduction and hydrogen evolution reactions显示文摘Metal-nitrogen doped carbon catalysts(M-N/C) with abundantly accessible M-Nxsites, particularly single metal atom M-N/C(SAM-N/C), have been developed as a substitute for expensive Pt-based catalysts.These catalysts are used to increase the efficiency of otherwise sluggish oxygen reduction reactions(ORR) and hydrogen evolution reactions(HER). However, although the agglomerated metal nanoparticles are usually easy to form, they are very difficult to remove due to the protective surface-coating carbon layers, a factor that significantly hampers SAM-N/C fabrication. Herein, we report a one-step pyrolysis approach to successfully fabricate single cobalt atom Co-N/C(SACo-N/C) by using a Co2+-SCN-coordination compound as the metal precursor. Thanks to the decomposition of Co2+-SCN-compound at lower temperature than that of carbon layer deposition, Co-rich particles grow up to larger ones before carbon layers formation. Even though encapsulated by the carbon layers, it is difficult for the large Co-rich particle to be completely sealed. And thus, it makes the Co atoms possible to escape from incomplete carbon layer, to coordinate with nitrogen atoms, and to form SACo-N/C catalysts. This SACo-N/C exhibits excellent performances for both ORR(half-wave potential of 0.878 V) and HER(overpotential at 10 mA/cm2 of178 m V), and is thus a potential replacement for Pt-based catalysts. When SACo-N/C is integrated into a Zn-O2 battery, battery with high open-circuit voltage(1.536 V) has high peak power density(266 mW/cm2)and large gravimetric energy density(755 mA h/gZn) at current densities of 100 mA/cm2. Thus, we believe that this strategy may offer a new direction for the effective generation of SAM-N/C catalysts. | Yao Wang Linhui Chen Zhanxin Mao Lishan Peng Rui Xiang Xianyi Tang Jianghai Deng Zidong Wei Qiang Liao | 2019 | Science Bulletin2019，64，15： | 10 |
| 2 | SOME PROPERTIES OF A KIND OF DIFFERENCE EQUATION显示文摘SOMEPROPERTIESOFAKINDOFDIFFERENCEEQUATION￥TangHengsheng,OuChunhua,LuoWei&LiXianyi(Centre-southInstituteofTechnology,421001)Ab... | Tang Hengsheng,Ou Chunhua,LuoWei & Li Xianyi(Centre-south Institute of Technology,421001) | 1996 | Annals of Differential Equations1996，12，3： | 1 |
| 3 | Theoretical perspective on synthetic man-made life:Learning from the origin of life显示文摘Creating a man-made life in the laboratory is one of life science's most intriguing yet challenging problems.Advances in synthetic biology and related theories,particularly those related to the origin of life,have laid the groundwork for further exploration and understanding in this field of artificial life or man-made life.But there remains a wealth of quantitative mathematical models and tools that have yet to be applied to this area.In this paper,we review the two main approaches often employed in the field of man-made life:the top-down approach that reduces the complexity of extant and existing living systems and the bottom-up approach that integrates welldefined components,by introducing the theoretical basis,recent advances,and their limitations.We then argue for another possible approach,namely'bottom-up from the origin of life':Starting with the establishment of autocatalytic chemical reaction networks that employ physical boundaries as the initial compartments,then designing directed evolutionary systems,with the expectation that independent compartments will eventually emerge so that the system becomes free-living.This approach is actually analogous to the process of how life originated.With this paper,we aim to stimulate the interest of synthetic biologists and experimentalists to consider a more theoretical perspective,and to promote the communication between the origin of life community and the synthetic man-made life community. | Lu Peng Zecheng Zhang Xianyi Wang Weiyi Qiu Liqian Zhou Hui Xiao Chunxiuzi Liu Shaohua Tang Zhiwei Qin Jiakun Jiang Zengru Di Yu Liu | 2023 | Quantitative Biology2023，11，4： | 0 |
| 4 | Optimal time of acute kidney injury microenvironment for proliferation and differentiation of mesenchymal stem cells显示文摘Objective To investigate the optimal timing of acute kidney injury environment for proliferation and differentiation of mesenchymal stem cells(MSCs).Methods MSCs were co-cultured with kidney homogenate at different ischemia/reperfusion(I/R)time points.The proliferation was reflected by CCK-8assay and cell number counting.The differentiation was reflected by cell shape and CK-18RNA expression.Results After 15dculture,shape of MSCs cultured with kidney homogenate at 72htime point was much more round and ellipsoidal,and the cells had a cobble like appearance.Cell number,CCK-8and CK-18level of MSCs cultured with kidney homogenate at 72htime point was significantly higher comparing with other time points.Conclusions 72hpost I/R was the optimal timing for proliferation and differentiation of MSCs. | Wu Chen Zhang Yixiong Tang Xianyi Jiang Yu Zou Lianhong | 2020 | 实用休克杂志(中英文)2020，4，2： | 0 |
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