Polysaccharides of Tricholoma matsutake Sing. were extracted with boilingwater, followed by precipitating with ethanol. Two membranes of different molecular weight cut-off, namely, 30 kD and 10 kD were chosen with ult...Polysaccharides of Tricholoma matsutake Sing. were extracted with boilingwater, followed by precipitating with ethanol. Two membranes of different molecular weight cut-off, namely, 30 kD and 10 kD were chosen with ultrafiltration. The antioxidant activity of the purification polysaccharides was evaluated by various antioxidant assay, including DPPH （l,l-diphenyl-2-picrylhydrazyl） radical scavenging, superoxide anion radical scavenging and hydrogen peroxide scavenging. The scavenging effect on hydroxyl radical and DPPH radical, which may be comparable to Vitamin C, while the scavenging effect on superoxide anion radicals was not obvious.展开更多
This paper examines the disease writing in Jesmyn Ward’s Sing,Unburied,Sing,focusing on its metaphorical implications at three levels.Through an analysis of three central diseases-Mam’s cancer,Leonie’s drug addicti...This paper examines the disease writing in Jesmyn Ward’s Sing,Unburied,Sing,focusing on its metaphorical implications at three levels.Through an analysis of three central diseases-Mam’s cancer,Leonie’s drug addiction,and Kayla’s fever and vomiting,this study reveals how Ward employs illness as a lens to critique systemic racism,social injustice,and intergenerational trauma in the American South.Mam’s cancer symbolizes emotional repression and historical wounds inflicted upon Black Americans,while Leonie’s addiction reflects both personal escapism and the destructive consequences of racial and social marginalization.Kayla’s symptoms,along with other people’s symtom of vomiting,serve as visceral expressions of psychological rejection and resistance to oppression.Drawing on Sontag’s theories of illness as metaphor,the paper argues that Ward’s disease narratives transcend individual suffering,exposing the pervasive“diseases”of racism and inequality in society.The novel’s portrayal of illness underscores the resilience of Black communities and the urgent need for collective healing from cultural trauma.展开更多
Nobel Prize winner Doris Lessing is a renowned writer in the contemporary British literary scene.Her debut novel The Grass is Singing is based on a case in which a black manservant kills a white mistress who is poor a...Nobel Prize winner Doris Lessing is a renowned writer in the contemporary British literary scene.Her debut novel The Grass is Singing is based on a case in which a black manservant kills a white mistress who is poor and mentally unbalanced.Doris Lessing arranges a tangible form of perception for the expression of the colonial discourse in the work by seeking the relationship between spatial structure and the writer’s value.This paper focuses on the spatial writing in The Grass is Singing and analyses it in depth with reference to the spatial critical theories of Henri Lefebvre and Michel Foucault.The oppressed and enslaved characters in the novel are analysed from three perspectives:physical space,social space and mental space respectively to explore how power oppression is made visible through space and the writer’s critique of colonial relations and racial discrimination as well as unequal gender relations.展开更多
From the perspective of the inheritance of intangible cultural heritage,this study explores practical strategies for integrating local opera singing styles into the cultivation of preschool music literacy.After litera...From the perspective of the inheritance of intangible cultural heritage,this study explores practical strategies for integrating local opera singing styles into the cultivation of preschool music literacy.After literature research,field investigation,and teaching practice,it analyzes the application value of the artistic features of local opera singing styles in preschool education and seeks effective methods for integrating them into music education in kindergartens.Research shows that local opera singing styles are rich in cultural connotations and artistic charm,and have unique advantages in cultivating children’s musical literacy.Therefore,integrating them into preschool music education is beneficial to children’s understanding of traditional culture,the development of musical abilities,and the cultivation of aesthetic tastes.This study proposes the following practical strategies:Select suitable opera segments for young children and design interesting teaching activities;use multimedia technology to create vivid and interesting learning scenarios;organize opera experience activities to bring children closer to traditional culture;and conduct teacher training to enhance their knowledge of opera and teaching abilities.This research result has certain theoretical and practical significance for promoting local operas into kindergartens,facilitating the inheritance of intangible cultural heritage,and innovating preschool music education.展开更多
Three-dimensional(3D)covalent organic frameworks(COFs)have attracted extensive attention as photocatalysts for CO_(2)reduction reactions.Introducing metal atoms is essential for enhancing activity,but previous metal s...Three-dimensional(3D)covalent organic frameworks(COFs)have attracted extensive attention as photocatalysts for CO_(2)reduction reactions.Introducing metal atoms is essential for enhancing activity,but previous metal sites in 3D COFs predominantly exhibit symmetrical coordination,making them unsuitable for CO_(2)activation.Here,we design a 3D COF with 2,2'-pyridine linked around tetra-(4-anilyl)methane(TCM-Bpy-COF),where Co^(2+)is asymmetrically coordinated by bipyridine and acetates(TCMBpy-COF-CoAc).The TCM-Bpy-COF-CoAc exhibits outstanding photocatalytic CO_(2)reduction performance under weak visible light,achieving a CO evolution rate of 26,650μmol g^(-1)h^(-1)under 5 W of lightemitting-diode(LED)lamp and high apparent quantum efficiency.The performance far exceeds that of symmetrically coordinated bipyridine-Co-bipyridine TCM-Bpy-COF and surpasses most reported COF-based photocatalysts.In-situ spectral characterizations and theoretical calculations show that asymmetric N,O-coordination around the Co^(2+)center polarizes electron density and lowers reaction energy barriers of^(*)COOH intermediates,enhancing the conversion of CO_(2)to CO.This work inspires the design of 3D COF-based photocatalysts with highly catalytic efficiency.展开更多
The Sing-song Girls of Shanghai为张爱玲译作之沧海遗珠,此译本凝结了张氏数十年翻译之功。后经孔慧怡整理,张、孔二人合译之The Sing-song Girls of Shanghai始由美国哥伦比亚大学出版社出版。从译者使用的翻译策略,即归化、异化并...The Sing-song Girls of Shanghai为张爱玲译作之沧海遗珠,此译本凝结了张氏数十年翻译之功。后经孔慧怡整理,张、孔二人合译之The Sing-song Girls of Shanghai始由美国哥伦比亚大学出版社出版。从译者使用的翻译策略,即归化、异化并举之策略和对超文本的有效使用两方面评析这部合译之作可以发现,The Sing-song Girls of Shanghai再现了原文平淡而又近自然的风格。展开更多
文摘Polysaccharides of Tricholoma matsutake Sing. were extracted with boilingwater, followed by precipitating with ethanol. Two membranes of different molecular weight cut-off, namely, 30 kD and 10 kD were chosen with ultrafiltration. The antioxidant activity of the purification polysaccharides was evaluated by various antioxidant assay, including DPPH （l,l-diphenyl-2-picrylhydrazyl） radical scavenging, superoxide anion radical scavenging and hydrogen peroxide scavenging. The scavenging effect on hydroxyl radical and DPPH radical, which may be comparable to Vitamin C, while the scavenging effect on superoxide anion radicals was not obvious.
文摘This paper examines the disease writing in Jesmyn Ward’s Sing,Unburied,Sing,focusing on its metaphorical implications at three levels.Through an analysis of three central diseases-Mam’s cancer,Leonie’s drug addiction,and Kayla’s fever and vomiting,this study reveals how Ward employs illness as a lens to critique systemic racism,social injustice,and intergenerational trauma in the American South.Mam’s cancer symbolizes emotional repression and historical wounds inflicted upon Black Americans,while Leonie’s addiction reflects both personal escapism and the destructive consequences of racial and social marginalization.Kayla’s symptoms,along with other people’s symtom of vomiting,serve as visceral expressions of psychological rejection and resistance to oppression.Drawing on Sontag’s theories of illness as metaphor,the paper argues that Ward’s disease narratives transcend individual suffering,exposing the pervasive“diseases”of racism and inequality in society.The novel’s portrayal of illness underscores the resilience of Black communities and the urgent need for collective healing from cultural trauma.
文摘Nobel Prize winner Doris Lessing is a renowned writer in the contemporary British literary scene.Her debut novel The Grass is Singing is based on a case in which a black manservant kills a white mistress who is poor and mentally unbalanced.Doris Lessing arranges a tangible form of perception for the expression of the colonial discourse in the work by seeking the relationship between spatial structure and the writer’s value.This paper focuses on the spatial writing in The Grass is Singing and analyses it in depth with reference to the spatial critical theories of Henri Lefebvre and Michel Foucault.The oppressed and enslaved characters in the novel are analysed from three perspectives:physical space,social space and mental space respectively to explore how power oppression is made visible through space and the writer’s critique of colonial relations and racial discrimination as well as unequal gender relations.
文摘From the perspective of the inheritance of intangible cultural heritage,this study explores practical strategies for integrating local opera singing styles into the cultivation of preschool music literacy.After literature research,field investigation,and teaching practice,it analyzes the application value of the artistic features of local opera singing styles in preschool education and seeks effective methods for integrating them into music education in kindergartens.Research shows that local opera singing styles are rich in cultural connotations and artistic charm,and have unique advantages in cultivating children’s musical literacy.Therefore,integrating them into preschool music education is beneficial to children’s understanding of traditional culture,the development of musical abilities,and the cultivation of aesthetic tastes.This study proposes the following practical strategies:Select suitable opera segments for young children and design interesting teaching activities;use multimedia technology to create vivid and interesting learning scenarios;organize opera experience activities to bring children closer to traditional culture;and conduct teacher training to enhance their knowledge of opera and teaching abilities.This research result has certain theoretical and practical significance for promoting local operas into kindergartens,facilitating the inheritance of intangible cultural heritage,and innovating preschool music education.
基金financial support from the National Natural Science Foundation of China(No.22072183)the Natural Science Foundation of Hunan Province,China(No.2022JJ30690)supported in part by the High Performance Computing Center of Central South University。
文摘Three-dimensional(3D)covalent organic frameworks(COFs)have attracted extensive attention as photocatalysts for CO_(2)reduction reactions.Introducing metal atoms is essential for enhancing activity,but previous metal sites in 3D COFs predominantly exhibit symmetrical coordination,making them unsuitable for CO_(2)activation.Here,we design a 3D COF with 2,2'-pyridine linked around tetra-(4-anilyl)methane(TCM-Bpy-COF),where Co^(2+)is asymmetrically coordinated by bipyridine and acetates(TCMBpy-COF-CoAc).The TCM-Bpy-COF-CoAc exhibits outstanding photocatalytic CO_(2)reduction performance under weak visible light,achieving a CO evolution rate of 26,650μmol g^(-1)h^(-1)under 5 W of lightemitting-diode(LED)lamp and high apparent quantum efficiency.The performance far exceeds that of symmetrically coordinated bipyridine-Co-bipyridine TCM-Bpy-COF and surpasses most reported COF-based photocatalysts.In-situ spectral characterizations and theoretical calculations show that asymmetric N,O-coordination around the Co^(2+)center polarizes electron density and lowers reaction energy barriers of^(*)COOH intermediates,enhancing the conversion of CO_(2)to CO.This work inspires the design of 3D COF-based photocatalysts with highly catalytic efficiency.
文摘The Sing-song Girls of Shanghai为张爱玲译作之沧海遗珠,此译本凝结了张氏数十年翻译之功。后经孔慧怡整理,张、孔二人合译之The Sing-song Girls of Shanghai始由美国哥伦比亚大学出版社出版。从译者使用的翻译策略,即归化、异化并举之策略和对超文本的有效使用两方面评析这部合译之作可以发现,The Sing-song Girls of Shanghai再现了原文平淡而又近自然的风格。
