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Madama Butterfly or M. Butterfly? An Analysis on Imperfection of Deconstruction in M. Butterfly
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作者 Dong Yan 《International English Education Research》 2015年第3期150-152,共3页
Chinese American literature hasn't developed into a visible power until 1970's in the American literary world. David Henry Hwang is a dazzling star among Chinese-American writers. He is the first to perform his own ... Chinese American literature hasn't developed into a visible power until 1970's in the American literary world. David Henry Hwang is a dazzling star among Chinese-American writers. He is the first to perform his own works on Broadway as well as the first to get Tony Award. He is the most successful and reputable Asian American playwright in the history of American Drama. Hwang's masterpiece M. Butterfly inverts orientalism's constructing the relationship between the east and the west, subverts stereotypes of the oriental in the westerners' eyes, and cries out a distinctive voice of"the other" to western hegemony culture. However~ as a Chinese-American writer of the second generation that receives white mainstream cultural education, Hwang's deconstructing the orientalism and subverting the fixed relationship between the east and west has its imperfection, which results from social and historical environment the author lives in, personal experiences as well as national culture identity. In addition, Hwang's M.Butterfly aims at appealing for the eastern and western cultures' learning from each other, communicating with each other in order to achieve the goal of cultural co-prosperity with a broader mind in a harmonious atmosphere. 展开更多
关键词 m.butterfly subversion and deconstruction ImPERFECTION cultural co-prosperity
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The Gaze and Being Gazed: From Madama Butterfly to M. Butterfly
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作者 李琼华 《商情》 2012年第44期270-271,共2页
[Abstrac]Through the analysis of both Madama Butterfly and M. Butterfly,this paper expores the gaze of the Occidental upon the Oriental especially the women. It analyzes the change of the Occi-dental gaze and gets the... [Abstrac]Through the analysis of both Madama Butterfly and M. Butterfly,this paper expores the gaze of the Occidental upon the Oriental especially the women. It analyzes the change of the Occi-dental gaze and gets the result that the misconception of the Oriental and its culture might form a big mockery to the Orientalism. 展开更多
关键词 英语教学 教学方法 课堂教学 外语教学
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Representation of the Other in M. Butterfly
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作者 Zhang Lei 《商情》 2014年第7期374-374,共1页
关键词 英语学习 学习方法 阅读知识 阅读材料
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Butterfly taxonomic and functional diversity in the urban green spaces of Hefei city
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作者 Haicong Zeng Yan Zhu +5 位作者 Junyao Zhang Chenliang Li Jian Zhang Hui Liu Jianan Wang Dexian Zhao 《Journal of Forestry Research》 SCIE EI CAS CSCD 2024年第5期47-62,共16页
Urbanization has profound impacts on ecological environments. Green spaces are a vital component of urban ecosystems and play a crucial role in maintaining ecological balance and enhancing sustainability. This study a... Urbanization has profound impacts on ecological environments. Green spaces are a vital component of urban ecosystems and play a crucial role in maintaining ecological balance and enhancing sustainability. This study aimed to investigate the community composition characteristics of butterflies in urban green spaces within the context of rapid urbanization. Simultaneously, it explored the status and differences in butterfly taxonomic diversity, functional diversity, and functional traits among different types of urban green spaces, regions, and urban gradients to provide relevant insights for further improving urban green space quality and promoting biodiversity conservation. We conducted a year-long survey of 80 green spaces across different urban regions and ring roads within Hefei City, Anhui Province, with monthly sampling intervals over 187 transects. A total of 4822 butterflies, belonging to 5 families, 17 subfamilies, 40 genera, and 55 species were identified. The species richness, Shannon, Simpson, functional richness, and Rao's quadratic entropy indices of butterflies in urban park green spaces were all significantly higher than those in residential and street green spaces(P < 0.05). Differences in butterfly diversity and functional traits among different urban regions and ring roads were relatively minor, and small-sized, multivoltine, and long flying duration butterflies dominated urban green spaces. Overall, these spaces offer more favorable habitats for butterflies. However, some residential green spaces and street green spaces demonstrate potential for butterfly conservation. 展开更多
关键词 Urban green space planning Rapid urbanization butterfly functional traits Green space types Urban biodiversity
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罗汉果苷V调控高糖状态巨噬细胞M1极化促进骨髓间充质干细胞的成骨分化
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作者 叶枝茂 惠久莹 +2 位作者 钟晓霞 麦昱颖 李昊 《中国组织工程研究》 CAS 北大核心 2025年第19期3968-3975,共8页
背景:糖尿病微环境会造成巨噬细胞过度M1极化,这种高糖炎症状态会抑制骨髓间充质干细胞的成骨分化,从而影响糖尿病骨缺损的愈合。研究表明罗汉果苷Ⅴ具有抗炎、抗氧化、降血糖的作用,但其能否调节高糖炎症状态下巨噬细胞M1极化及骨髓间... 背景:糖尿病微环境会造成巨噬细胞过度M1极化,这种高糖炎症状态会抑制骨髓间充质干细胞的成骨分化,从而影响糖尿病骨缺损的愈合。研究表明罗汉果苷Ⅴ具有抗炎、抗氧化、降血糖的作用,但其能否调节高糖炎症状态下巨噬细胞M1极化及骨髓间充质干细胞的成骨分化尚不清楚。目的:探讨罗汉果苷Ⅴ在高糖炎症状态下调节巨噬细胞M1型极化对骨髓间充质干细胞成骨分化的影响。方法:构建糖尿病C57BL/6小鼠模型,从正常和糖尿病小鼠分离骨髓来源巨噬细胞,分别培养于低糖和高糖培养基。使用脂多糖和干扰素γ作为炎症刺激诱导骨髓来源巨噬细胞的M1型极化,同时以160,320,640μmol/L罗汉果苷Ⅴ干预,用流式细胞术检测F4/80^(+)CD86^(+)细胞比例,qRT-PCR检测诱导型一氧化氮合酶、白细胞介素1β、白细胞介素6的mRNA表达水平,ELISA检测骨髓来源巨噬细胞上清液中肿瘤坏死因子α水平。分离C57BL/6小鼠骨髓间充质干细胞,分别使用低糖或高糖成骨诱导液诱导成骨分化,添加M1型巨噬细胞条件培养基作为炎症刺激,以及320μmol/L罗汉果苷Ⅴ干预,成骨诱导14 d后采用qRT-PCR检测碱性磷酸酶、Runt相关因子2、骨钙素、骨桥蛋白的mRNA表达水平,成骨诱导21 d后进行茜素红染色及定量分析。结果与结论:①流式细胞术结果显示320,640μmol/L罗汉果苷Ⅴ组的F4/80^(+)CD86^(+)细胞比例明显低于高糖炎症对照组(P<0.05);②qRT-PCR结果显示160,320,640μmol/L罗汉果苷Ⅴ组的诱导型一氧化氮合酶、白细胞介素6的mRNA相对表达量较高糖炎症对照组显著降低(P<0.05),320,640μmol/L罗汉果苷Ⅴ组白细胞介素1β的mRNA相对表达量较高糖炎症对照组显著降低(P<0.05);③ELISA结果显示160,320,640μmol/L罗汉果苷Ⅴ组的肿瘤坏死因子α分泌水平较高糖炎症对照组显著降低(P<0.05);④320μmol/L罗汉果苷Ⅴ干预后,高糖炎症状态下骨髓间充质干细胞的钙盐沉积增加(P<0.05),且碱性磷酸酶、Runt相关因子2和骨桥蛋白的mRNA相对表达量增加(P<0.05)。结果表明,罗汉果苷Ⅴ可通过抑制高糖炎症状态下骨髓来源巨噬细胞的M1型极化及炎症因子表达,促进骨髓间充质干细胞的成骨分化。 展开更多
关键词 罗汉果苷Ⅴ 巨噬细胞 m1型极化 骨髓间充质干细胞 炎症反应 成骨分化 高糖
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M2型巨噬细胞衍生外泌体促进小胶质细胞M2型极化
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作者 方俊 魏伟 +5 位作者 薛亚婷 崔臣龙 卫嘉晟 石筱 杨丽娟 杨保仲 《中国组织工程研究》 CAS 北大核心 2025年第25期5320-5327,共8页
背景:目前对于M2型巨噬细胞衍生外泌体的研究多集中于促进伤口愈合及成骨细胞的增殖和分化,而很少有研究关注其对小胶质细胞表型的调控作用。目的:探讨M2型巨噬细胞衍生外泌体对于小胶质细胞的表型调控作用及分子机制。方法:①提取骨髓... 背景:目前对于M2型巨噬细胞衍生外泌体的研究多集中于促进伤口愈合及成骨细胞的增殖和分化,而很少有研究关注其对小胶质细胞表型的调控作用。目的:探讨M2型巨噬细胞衍生外泌体对于小胶质细胞的表型调控作用及分子机制。方法:①提取骨髓原代巨噬细胞,用50 ng/m L白细胞介素4刺激巨噬细胞24 h促进巨噬细胞M2型极化,流式细胞术和细胞免疫荧光鉴定M2型巨噬细胞标志物CD206;②提取和鉴定M2型巨噬细胞衍生外泌体;③将小胶质细胞BV2随机分为3组:对照组、脂多糖组、治疗组,对照组不做处理,脂多糖组加入500 ng/m L脂多糖干预24 h,治疗组同时加入500 ng/m L脂多糖和25μg/m L M2型巨噬细胞衍生外泌体干预24 h,ELISA检测培养上清中肿瘤坏死因子α和白细胞介素10的分泌量,q RT-PCR检测细胞中诱导型一氧化氮合酶、精氨酸酶1、白细胞介素1β和白细胞介素10的m RNA表达,Western blot检测诱导型一氧化氮合酶、精氨酸酶1的蛋白表达以及核因子κB信号通路相关蛋白表达。结果与结论:①ELISA结果显示,与对照组相比,脂多糖组肿瘤坏死因子α分泌明显增多;与脂多糖组相比,治疗组肿瘤坏死因子α的分泌减少而白细胞介素10的分泌增多;②q RT-PCR结果显示,与对照组相比,脂多糖组白细胞介素1β、诱导型一氧化氮合酶m RNA表达升高;与脂多糖组相比,治疗组白细胞介素1β、诱导型一氧化氮合酶m RNA表达降低,白细胞介素10、精氨酸酶1 m RNA表达升高;③Western blot结果显示,与对照组相比,脂多糖组诱导型一氧化氮合酶蛋白表达升高;与脂多糖组相比,治疗组诱导型一氧化氮合酶蛋白表达降低,而精氨酸酶1蛋白表达升高;(4)与对照组相比,脂多糖组核因子κB信号通路中P65、p-IκB-α蛋白表达降低;与脂多糖组相比,治疗组P65、p-IκB-α蛋白表达升高。结果表明:M2型巨噬细胞衍生外泌体可以显著抑制脂多糖诱导小胶质细胞的炎症反应,促进抗炎因子白细胞介素10的表达,抑制促炎因子肿瘤坏死因子α、白细胞介素1β的表达,促进小胶质细胞表型由M1型向M2型极化,其机制可能与M2型巨噬细胞衍生外泌体抑制核因子κB信号通路激活有关。 展开更多
关键词 m2巨噬细胞 外泌体 小胶质细胞 炎症 NF-ΚB信号通路 神经病理性疼痛 极化
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Microglia:a promising therapeutic target in spinal cord injury
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作者 Xiaowei Zha Guoli Zheng +3 位作者 Thomas Skutella Karl Kiening Andreas Unterberg Alexander Younsi 《Neural Regeneration Research》 SCIE CAS 2025年第2期454-463,共10页
Microglia are present throughout the central nervous system and are vital in neural repair,nutrition,phagocytosis,immunological regulation,and maintaining neuronal function.In a healthy spinal cord,microglia are accou... Microglia are present throughout the central nervous system and are vital in neural repair,nutrition,phagocytosis,immunological regulation,and maintaining neuronal function.In a healthy spinal cord,microglia are accountable for immune surveillance,however,when a spinal cord injury occurs,the microenvironment drastically changes,leading to glial scars and failed axonal regeneration.In this context,microglia vary their gene and protein expression during activation,and proliferation in reaction to the injury,influencing injury responses both favorably and unfavorably.A dynamic and multifaceted injury response is mediated by microglia,which interact directly with neurons,astrocytes,oligodendrocytes,and neural stem/progenitor cells.Despite a clear understanding of their essential nature and origin,the mechanisms of action and new functions of microglia in spinal cord injury require extensive research.This review summarizes current studies on microglial genesis,physiological function,and pathological state,highlights their crucial roles in spinal cord injury,and proposes microglia as a therapeutic target. 展开更多
关键词 ASTROCYTES CYTOKINES functional recovery immune regulation m1/m2 activation mACROPHAGES mICROGLIA NEUROINFLAmmATION spinal cord injury therapy
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Investigating Müller glia reprogramming in mice: a retrospective of the last decade, and a look to the future
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作者 Zhiyuan Yin Jiahui Kang +3 位作者 Xuan Cheng Hui Gao Shujia Huo Haiwei Xu 《Neural Regeneration Research》 SCIE CAS 2025年第4期946-959,共14页
Müller glia,as prominent glial cells within the retina,plays a significant role in maintaining retinal homeostasis in both healthy and diseased states.In lower vertebrates like zebrafish,these cells assume respon... Müller glia,as prominent glial cells within the retina,plays a significant role in maintaining retinal homeostasis in both healthy and diseased states.In lower vertebrates like zebrafish,these cells assume responsibility for spontaneous retinal regeneration,wherein endogenous Müller glia undergo proliferation,transform into Müller glia-derived progenitor cells,and subsequently regenerate the entire retina with restored functionality.Conversely,Müller glia in the mouse and human retina exhibit limited neural reprogramming.Müller glia reprogramming is thus a promising strategy for treating neurodegenerative ocular disorders.Müller glia reprogramming in mice has been accomplished with remarkable success,through various technologies.Advancements in molecular,genetic,epigenetic,morphological,and physiological evaluations have made it easier to document and investigate the Müller glia programming process in mice.Nevertheless,there remain issues that hinder improving reprogramming efficiency and maturity.Thus,understanding the reprogramming mechanism is crucial toward exploring factors that will improve Müller glia reprogramming efficiency,and for developing novel Müller glia reprogramming strategies.This review describes recent progress in relatively successful Müller glia reprogramming strategies.It also provides a basis for developing new Müller glia reprogramming strategies in mice,including epigenetic remodeling,metabolic modulation,immune regulation,chemical small-molecules regulation,extracellular matrix remodeling,and cell-cell fusion,to achieve Müller glia reprogramming in mice. 展开更多
关键词 cell fusion chemical small-molecules EPIGENETIC extracellular matrix immune metabolic mICE müller glia neurodegenerative diseases REPROGRAmmING retina regeneration
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Recombinant chitinase-3-like protein 1 alleviates learning and memory impairments via M2 microglia polarization in postoperative cognitive dysfunction mice
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作者 Yujia Liu Xue Han +6 位作者 Yan Su Yiming Zhou Minhui Xu Jiyan Xu Zhengliang Ma Xiaoping Gu Tianjiao Xia 《Neural Regeneration Research》 SCIE CAS 2025年第9期2727-2736,共10页
Postoperative cognitive dysfunction is a seve re complication of the central nervous system that occurs after anesthesia and surgery,and has received attention for its high incidence and effect on the quality of life ... Postoperative cognitive dysfunction is a seve re complication of the central nervous system that occurs after anesthesia and surgery,and has received attention for its high incidence and effect on the quality of life of patients.To date,there are no viable treatment options for postoperative cognitive dysfunction.The identification of postoperative cognitive dysfunction hub genes could provide new research directions and therapeutic targets for future research.To identify the signaling mechanisms contributing to postoperative cognitive dysfunction,we first conducted Gene Ontology and Kyoto Encyclopedia of Genes and Genomes pathway enrichment analyses of the Gene Expression Omnibus GSE95426 dataset,which consists of mRNAs and long non-coding RNAs differentially expressed in mouse hippocampus3 days after tibial fracture.The dataset was enriched in genes associated with the biological process"regulation of immune cells,"of which Chill was identified as a hub gene.Therefore,we investigated the contribution of chitinase-3-like protein 1 protein expression changes to postoperative cognitive dysfunction in the mouse model of tibial fractu re surgery.Mice were intraperitoneally injected with vehicle or recombinant chitinase-3-like protein 124 hours post-surgery,and the injection groups were compared with untreated control mice for learning and memory capacities using the Y-maze and fear conditioning tests.In addition,protein expression levels of proinflammatory factors(interleukin-1βand inducible nitric oxide synthase),M2-type macrophage markers(CD206 and arginase-1),and cognition-related proteins(brain-derived neurotropic factor and phosphorylated NMDA receptor subunit NR2B)were measured in hippocampus by western blotting.Treatment with recombinant chitinase-3-like protein 1 prevented surgery-induced cognitive impairment,downregulated interleukin-1βand nducible nitric oxide synthase expression,and upregulated CD206,arginase-1,pNR2B,and brain-derived neurotropic factor expression compared with vehicle treatment.Intraperitoneal administration of the specific ERK inhibitor PD98059 diminished the effects of recombinant chitinase-3-like protein 1.Collectively,our findings suggest that recombinant chitinase-3-like protein 1 ameliorates surgery-induced cognitive decline by attenuating neuroinflammation via M2 microglial polarization in the hippocampus.Therefore,recombinant chitinase-3-like protein1 may have therapeutic potential fo r postoperative cognitive dysfunction. 展开更多
关键词 Chil1 hippocampus learning and memory m2 microglia NEUROINFLAmmATION postoperative cognitive dysfunction(POCD) recombinant CHI3L1
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Postnatal development of rat retina:a continuous observation and comparison between the organotypic retinal explant model and in vivo development
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作者 Baoqi Hu Rui Wang +8 位作者 Hanyue Zhang Xiou Wang Sijia Zhou Bo Ma Yan Luan Xin Wang Xinlin Chen Zhichao Zhang Qianyan Kang 《Neural Regeneration Research》 SCIE CAS 2025年第3期900-912,共13页
The organotypic retinal explant culture has been established for more than a decade and offers a range of unique advantages compared with in vivo experiments and cell cultures.However,the lack of systematic and contin... The organotypic retinal explant culture has been established for more than a decade and offers a range of unique advantages compared with in vivo experiments and cell cultures.However,the lack of systematic and continuous comparison between in vivo retinal development and the organotypic retinal explant culture makes this model controversial in postnatal retinal development studies.Thus,we aimed to verify the feasibility of using this model for postnatal retinal development studies by comparing it with the in vivo retina.In this study,we showed that postnatal retinal explants undergo normal development,and exhibit a consistent structure and timeline with retinas in vivo.Initially,we used SOX2 and PAX6 immunostaining to identify retinal progenitor cells.We then examined cell proliferation and migration by immunostaining with Ki-67 and doublecortin,respectively.Ki-67-and doublecortin-positive cells decreased in both in vivo and explants during postnatal retinogenesis,and exhibited a high degree of similarity in abundance and distribution between groups.Additionally,we used Ceh-10 homeodomain-containing homolog,glutamate-ammonia ligase(glutamine synthetase),neuronal nuclei,and ionized calcium-binding adapter molecule 1 immunostaining to examine the emergence of bipolar cells,Müller glia,mature neurons,and microglia,respectively.The timing and spatial patterns of the emergence of these cell types were remarkably consistent between in vivo and explant retinas.Our study showed that the organotypic retinal explant culture model had a high degree of consistency with the progression of in vivo early postnatal retina development.The findings confirm the accuracy and credibility of this model and support its use for long-term,systematic,and continuous observation. 展开更多
关键词 bipolar cells differentiation in vivo microglia müller glia organotypic retinal explant culture postnatal retina development proliferation retinal progenitor cells
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Müller cells are activated in response to retinal outer nuclear layer degeneration in rats subjected to simulated weightlessness conditions
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作者 Yuxue Mu Ning Zhang +7 位作者 Dongyu Wei Guoqing Yang Lilingxuan Yao Xinyue Xu Yang Li Junhui Xue Zuoming Zhang Tao Chen 《Neural Regeneration Research》 SCIE CAS 2025年第7期2116-2128,共13页
A microgravity environment has been shown to cause ocular damage and affect visual acuity,but the underlying mechanisms remain unclear.Therefore,we established an animal model of weightlessness via tail suspension to ... A microgravity environment has been shown to cause ocular damage and affect visual acuity,but the underlying mechanisms remain unclear.Therefore,we established an animal model of weightlessness via tail suspension to examine the pathological changes and molecular mechanisms of retinal damage under microgravity.After 4 weeks of tail suspension,there were no notable alterations in retinal function and morphology,while after 8 weeks of tail suspension,significant reductions in retinal function were observed,and the outer nuclear layer was thinner,with abundant apoptotic cells.To investigate the mechanism underlying the degenerative changes that occurred in the outer nuclear layer of the retina,proteomics was used to analyze differentially expressed proteins in rat retinas after 8 weeks of tail suspension.The results showed that the expression levels of fibroblast growth factor 2(also known as basic fibroblast growth factor)and glial fibrillary acidic protein,which are closely related to Müller cell activation,were significantly upregulated.In addition,Müller cell regeneration and Müller cell gliosis were observed after 4 and 8 weeks,respectively,of simulated weightlessness.These findings indicate that Müller cells play an important regulatory role in retinal outer nuclear layer degeneration during weightlessness. 展开更多
关键词 glial fibrous acidic protein GLIOSIS müller cells nerve growth factor neural differentiation neurodegeneration proteomic retinal degeneration retinal outer nuclear layer simulated weightlessness
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The cGAS-STING-interferon regulatory factor 7 pathway regulates neuroinflammation in Parkinson's disease
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作者 Shengyang Zhou Ting Li +8 位作者 Wei Zhang Jian Wu Hui Hong Wei Quan Xinyu Qiao Chun Cui Chenmeng Qiao Weijiang Zhao Yanqin Shen 《Neural Regeneration Research》 SCIE CAS 2025年第8期2361-2372,共12页
Interferon regulatory factor 7 plays a crucial role in the innate immune response.However,whether interferon regulatory factor 7-mediated signaling contributes to Parkinson's disease remains unknown.Here we report... Interferon regulatory factor 7 plays a crucial role in the innate immune response.However,whether interferon regulatory factor 7-mediated signaling contributes to Parkinson's disease remains unknown.Here we report that interferon regulatory factor 7 is markedly up-regulated in a 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine-induced mouse model of Parkinson's disease and co-localizes with microglial cells.Both the selective cyclic guanosine monophosphate adenosine monophosphate synthase inhibitor RU.521 and the stimulator of interferon genes inhibitor H151 effectively suppressed interferon regulatory factor 7 activation in BV2 microglia exposed to 1-methyl-4-phenylpyridinium and inhibited transformation of mouse BV2 microglia into the neurotoxic M1 phenotype.In addition,si RNA-mediated knockdown of interferon regulatory factor 7 expression in BV2 microglia reduced the expression of inducible nitric oxide synthase,tumor necrosis factorα,CD16,CD32,and CD86 and increased the expression of the anti-inflammatory markers ARG1 and YM1.Taken together,our findings indicate that the cyclic guanosine monophosphate adenosine monophosphate synthase-stimulator of interferon genes-interferon regulatory factor 7 pathway plays a crucial role in the pathogenesis of Parkinson's disease. 展开更多
关键词 cyclic guanosine monophosphate adenosine monophosphate synthase H151 interferon regulatory factor 7 m1 phenotype neurodegenerative disease NEUROINFLAmmATION Parkinson’s disease RU521 STING type I interferon
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高速铁路主跨320 m钢-混部分斜拉桥无砟轨道适应性研究 被引量:1
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作者 王俊冬 欧阳辉来 +2 位作者 魏周春 苏成光 高天赐 《铁道标准设计》 北大核心 2024年第5期29-35,共7页
南玉高铁六景郁江特大桥设计将钢-混部分斜拉桥结构引入时速350 km高速铁路领域,而300 m级以上大跨度桥上无砟轨道的竖向变形极易超限,影响列车通过的安全性和舒适性,因此,系统研究在此大跨桥梁结构上铺设无砟轨道的适应性十分必要。通... 南玉高铁六景郁江特大桥设计将钢-混部分斜拉桥结构引入时速350 km高速铁路领域,而300 m级以上大跨度桥上无砟轨道的竖向变形极易超限,影响列车通过的安全性和舒适性,因此,系统研究在此大跨桥梁结构上铺设无砟轨道的适应性十分必要。通过建立有限元及动力学模型,分析不同组合工况下无砟轨道结构的变形特点及动力特性,运用60 m弦测法探究各工况下无砟轨道的线形变化规律,从而确定大跨度钢-混部分斜拉桥铺设无砟轨道的适应性,并对设计和施工提出合理化建议。主要结论如下:在各种不利组合荷载作用下,桥上无砟轨道结构强度满足规范要求,列车通过大桥的各项安全性与舒适性指标均满足规范要求;混凝土收缩徐变和斜拉索升降温是影响无砟轨道线形标准的两大主因,应在无砟轨道施工前确保足够的沉降观测期和收缩徐变释放期,并充分考虑拉索的保温设计;在温度组合荷载作用下,桥上无砟轨道的60 m弦测不平顺幅值为6.79 mm,满足高速铁路静态验收标准;但在叠加列车荷载和收缩徐变后,变形弦测值均出现Ⅱ级及以上超限,通过合理设置预拱度后可有效改善轨道平顺性标准。 展开更多
关键词 高速铁路 铁路桥 钢-混部分斜拉桥 无砟轨道 车-轨-桥耦合 60 m弦测法 轨道不平顺
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M-APSK鉴相算法与并行载波同步方法 被引量:1
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作者 郇浩 任科学 《通信学报》 EI CSCD 北大核心 2024年第3期104-116,共13页
为实现M进制幅相调制(M-APSK)体制下高阶调制信号的相位精细校正,将DVB-S2标准推荐的16APSK和32APSK的Q次方无数据辅助鉴相算法进行了扩展,以应用于64APSK、128APSK和256APSK等高阶调制。针对高阶调制的有效鉴相星座点占比较低时环路工... 为实现M进制幅相调制(M-APSK)体制下高阶调制信号的相位精细校正,将DVB-S2标准推荐的16APSK和32APSK的Q次方无数据辅助鉴相算法进行了扩展,以应用于64APSK、128APSK和256APSK等高阶调制。针对高阶调制的有效鉴相星座点占比较低时环路工作不稳定的问题提出了改进算法,通过对功率归一化后接收符号的幅值进行阈值判决,仅在高于阈值时进行鉴相,低于阈值时则不改变滤波器状态和相位补偿值,以提高星座点的鉴相有效性和可靠性,从而降低入锁门限。针对高速数传的符号速率非常高,而处理器的工作时钟频率相对较低的问题,提出了一种适用于M-APSK的并行载波同步方法,可以满足接收机工作时钟处理需要。相对于传统固定编码调制(CCM)的载波同步环路,该并行方法还可应用于可变编码调制(VCM)体制的频率跟踪。 展开更多
关键词 m进制幅相调制 鉴相 并行 载波同步
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Construction of the “Madame Butterfly Fantasy” in M.Butterfly
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作者 任敬辉 XU Li-ying 《海外英语》 2015年第10期178-179,共2页
M.Butterfly,written by David Henry Hwang,is one of the most influential plays in contemporary American dramatic his-tory.Hwang incorporates a stereotypical fantasy into his play,involving conflicts and misunderstandin... M.Butterfly,written by David Henry Hwang,is one of the most influential plays in contemporary American dramatic his-tory.Hwang incorporates a stereotypical fantasy into his play,involving conflicts and misunderstandings between the East and theWest,between men and women.Through the analysis of the construction of the Orientalist"Madame Butterfly Fantasy"in M.Butterfly,this paper analyzes sexual prejudice and racial bias embedded in the"Fantasy". 展开更多
关键词 madame butterfly FANTASY CONSTRUCTION m.butterfly
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过表达lncRNAHEM2M改善非酒精性脂肪肝病小鼠的肝脏损伤 被引量:1
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作者 孔祥 张腾 +5 位作者 张妍 高灵犀 汪文 汪梦燕 王国栋 吕坤 《南方医科大学学报》 CAS CSCD 北大核心 2024年第1期1-8,共8页
目的探讨过表达长链非编码RNA(lncRNA)HEM2M对非酒精性脂肪肝病(NAFLD)小鼠肝损伤的影响。方法野生型C57BL/6(WT)和条件性髓系细胞lncRNAHEM2M过表达(MYKI)小鼠分别喂饲普通饮食(ND)和高脂饮食(HFD),即为WT+ND、MYKI+ND、WT+HFD和MYKI+... 目的探讨过表达长链非编码RNA(lncRNA)HEM2M对非酒精性脂肪肝病(NAFLD)小鼠肝损伤的影响。方法野生型C57BL/6(WT)和条件性髓系细胞lncRNAHEM2M过表达(MYKI)小鼠分别喂饲普通饮食(ND)和高脂饮食(HFD),即为WT+ND、MYKI+ND、WT+HFD和MYKI+HFD组。12周后行腹腔糖耐量及胰岛素耐量试验后处死小鼠,检测小鼠血清和肝脏组织的肝功能指标,制备肝脏组织切片后行HE染色和F4/80免疫组化染色,ELISA法检测肝脏组织中IL-6、IL-1β和TNF-α水平,qRT-PCR检测M1型(TNF-α、iNOS和IL-6)和M2型(Arg-1、YM-1和IL-10)巨噬细胞标志物mRNA表达,免疫印迹检测肝脏组织中P-AKT、T-AKT、NLRC4、caspase-1和GSDMD蛋白表达,比色法和免疫荧光测定肝脏组织caspase-1活性。结果与HFD喂饲的WT小鼠相比,MYKI+HFD小鼠肝功能损伤减轻(P<0.01),肝脏脂肪变缓解,肝脏巨噬细胞浸润减少,糖耐量损伤及胰岛素抵抗改善(P<0.01);MYKI+HFD小鼠肝脏组织IL-6、IL-1β和TNF-α水平降低(P<0.01),M1型巨噬细胞标志物mRNA表达减少(P<0.01),M2型mRNA表达增加(P<0.01);MYKI+HFD小鼠肝脏组织NLRC4炎症小体活性降低(P<0.01),活性caspase-1减少,GSDMD-N蛋白表达降低(P<0.05)。结论过表达lncRNAHEM2M降低NAFLD小鼠肝脏炎症因子水平,进而改善胰岛素抵抗并抑制肝脏NLRC4炎症小体激活,减少肝细胞焦亡,最终改善NAFLD小鼠肝脏损伤。 展开更多
关键词 lncRNAHEm2m 巨噬细胞 非酒精性脂肪肝 细胞焦亡
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RBMX通过下调PKM2抑制膀胱癌细胞的增殖、迁移、侵袭和糖酵解 被引量:1
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作者 颜秋霞 曾鹏 +9 位作者 黄树强 谭翠钰 周秀琴 乔静 赵晓英 冯玲 朱振杰 张国志 胡鸿 陈彩蓉 《南方医科大学学报》 CAS CSCD 北大核心 2024年第1期9-16,共8页
目的探讨X连锁RNA结合基序蛋白(RBMX)对膀胱癌细胞(1376细胞和UC-3细胞)的增殖、迁移、侵袭的影响以及其在糖酵解中的作用。方法采用慢病毒表达系统和siRNA干扰技术,分别构建RBMX过表达和敲低的膀胱癌细胞模型(1376细胞和UC-3细胞)。采... 目的探讨X连锁RNA结合基序蛋白(RBMX)对膀胱癌细胞(1376细胞和UC-3细胞)的增殖、迁移、侵袭的影响以及其在糖酵解中的作用。方法采用慢病毒表达系统和siRNA干扰技术,分别构建RBMX过表达和敲低的膀胱癌细胞模型(1376细胞和UC-3细胞)。采用RT-qPCR和Westernblotting分别在mRNA水平和蛋白水平上检测细胞模型是否构建成功。通过EdU增殖实验和克隆形成实验检测过表达和敲低RBMX后细胞的生长和集落形成能力,同时通过Transwell实验分析过表达和敲低RBMX后对细胞迁移、侵袭能力的影响;随后,采用Westernblotting检测过表达和敲低RBMX后糖酵解关键蛋白PKM1(M1型丙酮酸激酶)和PKM2(M2型丙酮酸激酶)的表达变化;最后,利用葡萄糖和乳酸检测试剂盒分析过表达和敲低RBMX对膀胱癌细胞糖酵解的影响。结果RT-qPCR和Westernblotting结果显示,过表达RBMX膀胱癌细胞的mRNA和蛋白表达水平显著高于阴性对照组(P<0.05),敲低RBMX膀胱癌细胞的mRNA和蛋白表达水平显著低于阴性对照组(P<0.05)。过表达RBMX明显抑制膀胱癌细胞的增殖、克隆形成、迁移和侵袭,敲低RBMX则作用相反。Westernblotting实验结果显示,过表达RBMX使PKM1表达上升,PKM2表达下降,敲低RBMX则作用相反。葡萄糖消耗及乳酸生成实验表明,过表达RBMX均能抑制膀胱癌细胞葡萄糖消耗及乳酸生成(P<0.05),敲低RBMX均能促进膀胱癌细胞葡萄糖消耗及乳酸生成(P<0.05)。结论RBMX通过下调PKM2抑制膀胱癌的发生发展和糖酵解能力,有望成为膀胱癌诊断和治疗的潜在分子靶标。 展开更多
关键词 X连锁RNA结合基序蛋白 m2型丙酮酸激酶 膀胱癌 PKm2 糖酵解
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On the Main Characters in“Days of the Butterfly”
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作者 李伟娟 《海外英语》 2016年第24期169-170,共2页
"Days of the Butterfly"was one of Alice Munro's short stories written in 1950 s, when she was still a new hand. This paper will mainly focus on the development of the main characters in the story, includ... "Days of the Butterfly"was one of Alice Munro's short stories written in 1950 s, when she was still a new hand. This paper will mainly focus on the development of the main characters in the story, including Myra, the black girl who was the heroine, the teacher Miss Darling, and the Narrator"I". In portraying these characters, Munro adopted several writing techniques including conversation, detailed description, psychological description and so on. She vividly transferred those characters into paper. 展开更多
关键词 munro "Days of the butterfly" main characters myra miss Darling
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下调METTL5通过Wnt/β-catenin信号通路抑制三阴乳腺癌细胞增殖、迁移与侵袭 被引量:1
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作者 吴坤琳 严乾壹 +2 位作者 王德星 缪秀英 张惠灏 《中国药理学通报》 CAS CSCD 北大核心 2024年第2期285-291,共7页
目的探讨甲基转移酶5(methyltransferase-like 5,METTL5)在三阴乳腺癌(triple-negative breast cancer,TNBC)中的作用和潜在机制。方法采用免疫组织化学方法和Western blot检测TNBC肿瘤组织和细胞系中METTL5的表达情况。用靶向METTL5的s... 目的探讨甲基转移酶5(methyltransferase-like 5,METTL5)在三阴乳腺癌(triple-negative breast cancer,TNBC)中的作用和潜在机制。方法采用免疫组织化学方法和Western blot检测TNBC肿瘤组织和细胞系中METTL5的表达情况。用靶向METTL5的shRNA(shRNA-METTL5)转染TNBC细胞后,用CCK-8、集落形成、伤口愈合以及Transwell实验分别检测细胞增殖活性、迁移与侵袭,Western blot检测Wnt/β-catenin信号关键蛋白的表达。构建异种移植瘤模型,验证敲降METTL5对TNBC细胞在体内生长以及Wnt/β-catenin信号活性的影响。结果METTL5在TNBC肿瘤组织和细胞系中表达上调(P<0.01)。敲降METTL5可抑制TNBC细胞的增殖、迁移和侵袭并降低了Wnt/β-catenin信号分子β-catenin、细胞周期蛋白(Cyclin)D1、基质金属蛋白酶(MMP)-2和MMP-7的表达(均P<0.01)。体内实验显示,敲降METTL5减缓了移植瘤生长和Wnt/β-catenin信号活性。结论敲降METTL5能抑制TNBC细胞的增殖、迁移与侵袭,其作用可能与抑制Wnt/β-catenin信号通路有关。 展开更多
关键词 三阴乳腺癌 甲基转移酶5 m6A甲基化 WNT/Β-CATENIN 增殖 迁移 侵袭
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关于7.63m焦炉上升管结石墨原因分析及治理对策的研究
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作者 马素娟 冯敏超 +2 位作者 万文 关晓光 马素霞 《燃料与化工》 CAS 2024年第1期32-34,共3页
德国伍德公司开发的7.63 m特大型复热式焦炉在生产过程中上升管根部结石墨严重,成为制约焦炉正常生产的突出矛盾。从焦炉加热水平、焦炉加热制度、装煤量等因素综合分析影响上升管根部结石墨的成因,研究制定降低上升管根部结石墨速率的... 德国伍德公司开发的7.63 m特大型复热式焦炉在生产过程中上升管根部结石墨严重,成为制约焦炉正常生产的突出矛盾。从焦炉加热水平、焦炉加热制度、装煤量等因素综合分析影响上升管根部结石墨的成因,研究制定降低上升管根部结石墨速率的方法及自动清除上升管根部石墨的装置,达到避免因上升管根部结石墨影响焦炉生产的目的。 展开更多
关键词 7.63 m焦炉 石墨 原因分析 上升管
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