GIFs,short audio-free loops of moving sequences,are active members of social semiotic resources in the era of Internet 2.0 that could generate humor,mediate power and signal identity.This paper proposes the perspectiv...GIFs,short audio-free loops of moving sequences,are active members of social semiotic resources in the era of Internet 2.0 that could generate humor,mediate power and signal identity.This paper proposes the perspective of visual nominalization and visual telicity as GIF properties that,in the environment of social media technologies,become capable of expressing polyphonic evaluation,transcontexualized polysemy,and dual deixis.Visual nominalization expresses the freeing of movement from integration into a time-dependent narrative and the abstraction resulting in deemphasized participants and emphasized processes.These traits are activated and realized by visual telicity,which is looping move-ment that can be conceptualized as an atelic visual container which packages and expresses both telic and atelic processes.This paper argues that visual nomina-lization and visual telicity are what establishes GIFs'semiotic differences from still images and flm videos,and facilitates their integration with written language in online and computer-mediated discourse.展开更多
深入研究了β-O-4型木质素模型化合物———愈创木基丙三醇-β-愈创木基醚的合成新路线,并利用红外光谱和核磁共振谱对其化学结构进行了分析。采用由Cu2+/吡啶/过氧化氢组成的GIF(GIF sur YVETTE)型仿酶体系对这一木质素模型物进行了... 深入研究了β-O-4型木质素模型化合物———愈创木基丙三醇-β-愈创木基醚的合成新路线,并利用红外光谱和核磁共振谱对其化学结构进行了分析。采用由Cu2+/吡啶/过氧化氢组成的GIF(GIF sur YVETTE)型仿酶体系对这一木质素模型物进行了仿酶降解的研究,并采用GC-MS、13CNMR等方法分析了该β-O-4型木质素模型化合物在降解过程中的结构变化,在此基础上对这种仿酶降解的机理进行了探讨。研究结果表明:利用溴化铜对4-乙酰基愈创木酚进行溴化后很容易得到4-(α-溴化乙酰基)-愈创木酚中间体,从而提高了合成愈创木基丙三醇-β-愈创木基醚的效率。GIF仿酶降解体系对β-O-4型木质素模型物有较强的碎解能力,降解后产生一系列含羟基、醛基和羧基的芳香族低分子化合物,根据反应产物的结构可以说明β-O-4型木质素模型化合物的主要降解途径为:β-O-4醚键断裂、Cα—Cβ键断裂、Cβ—Cγ键断裂。本研究为该仿酶降解体系在无污染漂白工业上的应用提供理论依据。展开更多
文摘GIFs,short audio-free loops of moving sequences,are active members of social semiotic resources in the era of Internet 2.0 that could generate humor,mediate power and signal identity.This paper proposes the perspective of visual nominalization and visual telicity as GIF properties that,in the environment of social media technologies,become capable of expressing polyphonic evaluation,transcontexualized polysemy,and dual deixis.Visual nominalization expresses the freeing of movement from integration into a time-dependent narrative and the abstraction resulting in deemphasized participants and emphasized processes.These traits are activated and realized by visual telicity,which is looping move-ment that can be conceptualized as an atelic visual container which packages and expresses both telic and atelic processes.This paper argues that visual nomina-lization and visual telicity are what establishes GIFs'semiotic differences from still images and flm videos,and facilitates their integration with written language in online and computer-mediated discourse.
文摘 深入研究了β-O-4型木质素模型化合物———愈创木基丙三醇-β-愈创木基醚的合成新路线,并利用红外光谱和核磁共振谱对其化学结构进行了分析。采用由Cu2+/吡啶/过氧化氢组成的GIF(GIF sur YVETTE)型仿酶体系对这一木质素模型物进行了仿酶降解的研究,并采用GC-MS、13CNMR等方法分析了该β-O-4型木质素模型化合物在降解过程中的结构变化,在此基础上对这种仿酶降解的机理进行了探讨。研究结果表明:利用溴化铜对4-乙酰基愈创木酚进行溴化后很容易得到4-(α-溴化乙酰基)-愈创木酚中间体,从而提高了合成愈创木基丙三醇-β-愈创木基醚的效率。GIF仿酶降解体系对β-O-4型木质素模型物有较强的碎解能力,降解后产生一系列含羟基、醛基和羧基的芳香族低分子化合物,根据反应产物的结构可以说明β-O-4型木质素模型化合物的主要降解途径为:β-O-4醚键断裂、Cα—Cβ键断裂、Cβ—Cγ键断裂。本研究为该仿酶降解体系在无污染漂白工业上的应用提供理论依据。
