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催熟苹果中Lovastation处理对α—法呢烯的抑制作用:供给前体化合物的研究
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作者 ZhiguoJu 邱郭莲 《国外作物育种》 2002年第1期48-48,共1页
关键词 催熟 苹果 Lovastation处理 α-法呢烯 抑制作用 供给化合物
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整合社区优质资源探索医养融合服务新模式 被引量:1
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作者 王晖 何龙 《中外建筑》 2019年第3期110-112,共3页
国内老年化发展速度已超预期,迫在眉睫地需要对症下药,而居家养老与社区养老是公认的理想养老模式,又是国家"十三五规划"养老服务格局的大比重类型。本文将借助广州市海珠区有关社区层面的养老"大数据",更多地从&qu... 国内老年化发展速度已超预期,迫在眉睫地需要对症下药,而居家养老与社区养老是公认的理想养老模式,又是国家"十三五规划"养老服务格局的大比重类型。本文将借助广州市海珠区有关社区层面的养老"大数据",更多地从"自发—自增长—自运行"的角度去挖掘医养资源,试探讨社区优质资源融合的服务新模式。通过探索城市医养产业市场中各供给体间的平衡合作模式,促使进一步地加强城市社区治理力度,以包容地、可持续地发展理念,达到社区共治的目的。 展开更多
关键词 供给体 包容性增长 医养融合 新模式
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基于前体供给途径遗传改造提高褐黄孢链霉菌纳他霉素的产量 被引量:4
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作者 孔德真 李浩 +2 位作者 李晓杰 谢周杰 刘浩 《生物工程学报》 CAS CSCD 北大核心 2022年第12期4630-4643,共14页
纳他霉素(natamycin)是一种高效、广谱、安全的抗真菌剂,广泛应用于食品防腐与医药领域。纳他霉素可由多种链霉菌发酵产生。它是以乙酰辅酶A、丙二酰辅酶A及甲基丙二酰辅酶A为前体经Ⅰ型聚酮合酶(polyketide synthase,PKS)催化合成的多... 纳他霉素(natamycin)是一种高效、广谱、安全的抗真菌剂,广泛应用于食品防腐与医药领域。纳他霉素可由多种链霉菌发酵产生。它是以乙酰辅酶A、丙二酰辅酶A及甲基丙二酰辅酶A为前体经Ⅰ型聚酮合酶(polyketide synthase,PKS)催化合成的多烯大环内酯类化合物。本研究以纳他霉素产生菌——褐黄孢链霉菌为研究材料,分别对不同前体分子供给途径中的关键酶进行过表达,并确定影响纳他霉素产量的关键前体供给途径。研究结果发现:通过过表达乙酰辅酶A合成酶(acetyl-CoA synthase,ACS)加强乙酰辅酶A合成途径,以及通过过表达甲基丙二酰辅酶A变位酶(methylmalonyl-CoA mutase,MCM)加强甲基丙二酰辅酶A合成途径,重组菌株纳他霉素产量分别比野生型菌株提高了44.19%和20.51%。共过表达ACS和MCM,重组菌株纳他霉素产量获得进一步提升(达1123.34 mg/L),比野生型菌株提高了66.29%。上述发现为通过前体代谢工程的策略构建纳他霉素工业高产菌株提供了参考,也为其他聚酮类天然产物高产工程菌株的构建提供了借鉴。 展开更多
关键词 褐黄孢链霉菌 纳他霉素 供给 乙酰辅酶A合成酶 甲基丙二酰辅酶A变位酶
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Research on The Elderly Spiritual Demand in China
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作者 HAN Man 《International English Education Research》 2016年第4期16-19,共4页
Spiritual demand as one of the basic requirements of human, has more important significance for the elderly group. Descriptive statistic analysis shows that in the CLHLS, the elderly spiritual demand and supply is in ... Spiritual demand as one of the basic requirements of human, has more important significance for the elderly group. Descriptive statistic analysis shows that in the CLHLS, the elderly spiritual demand and supply is in a state of disequilibrium in our country, supply is far less than demand. The main factors of restricting the old people's spiritual need are not being met, including economic factors, intergenerational relations factors, emotional factors and the particularity of spiritual demand, etc. So we need to change our ideas, with the demand of the old structure and strength, by constructing a complete supply system of family, society and government to strengthen for the supply of the spiritual needs of old people, so that the elderly would be happy during his or her later lives. 展开更多
关键词 Spiritual demand Intergenerational relationship Demand structure Supply system
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Spatial Spillover and the Factors Influencing Public Service Supply in Sichuan Province, China 被引量:9
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作者 SONG Xue-qian DENG Wei LIU Ying 《Journal of Mountain Science》 SCIE CSCD 2014年第5期1356-1371,共16页
This article examines the spatial characteristics of public service supply and the factors influencing such supply in cities of Sichuan Province, China using spatial-autocorrelation and spatial econometric models with... This article examines the spatial characteristics of public service supply and the factors influencing such supply in cities of Sichuan Province, China using spatial-autocorrelation and spatial econometric models with statistical data in 2012. The results demonstrate that expenditures on different types of public services present different spatial autocorrelation patterns. Although the spatial differences in basic public service expenditures are relatively small, a clear fan-shaped spillover to the east can be seen in Chengdu City. Chengdu also shows high clustering of advanced public service expenditures, being a typical core-periphery pattern. Post-earthquake reconstruction expenditures are clustered in the "5.12 Wenchuan earthquake" region and spill over toward cities to the east. The efficiency of public services in the mountainous areas in western Sichuan is low and exhibits a pattern of low-low spatial autocorrelation. The efficiency of public service supply is affected by economic, social, political and geographical factors. Based on the results of this analysis, we recommend a supply strategy that incorporates different types of public services and a specialized public service supply strategy for mountainous areas. Overall public service efficiency should be enhanced by focusing on narrowing the gap in farmers' income among regions and accelerating urbanization. Decision-makers should consider moresupportive policies with regard to providing basic public services in mountainous areas to ensure an equalized supply of basic public services. To enhance the efficiency of advanced public service supply, additional growth pole should be encouraged and incentivized; however, investments are required to drive the development of the peripheral regions through regional economic integration. Both software and hardware types of infrastructure are required to supply services efficiently during post-disaster reconstruction. 展开更多
关键词 Public services Spatial Spillover Spatial Econometric Model Relief Degree of Land Surface China
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Community Endowment Service Supply of the Third Sector to Participate in Research in China
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作者 Ma Qin 《International English Education Research》 2015年第5期32-34,共3页
Under the background of population aging, unilateral by the government mode of community endowment service more and more cannot satisfy the require of the elderly, and community as working platform, the third sector p... Under the background of population aging, unilateral by the government mode of community endowment service more and more cannot satisfy the require of the elderly, and community as working platform, the third sector participation, in situ solve the problem of the community elderly, multivariate supply of the community elderly service mode gradually. The purpose of this paper is to research and practice experience at home and abroad, based on the literature method, interdisciplinary study, induction, etc on the current situation of the third sector to participate in community service, in order to understand and grasp the third sector in the form of participation in community endowment service as well as the advantages and disadvantages. Finally gives the countermeasures and Suggestions, to promote third sector to actively participate in community endowment services, promote social endowment service system construction in China. 展开更多
关键词 The third sector COMMUNITY Pension services
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Supply-Side Structural Reforms of China's Industries
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作者 黄群慧 《China Economist》 2017年第5期14-21,共8页
Supply-side structural reforms are structural adjustments and institutional reforms to address the mismatch between supply and demand and improve TFP. The mismatch is exhibited at the supply side and arises from struc... Supply-side structural reforms are structural adjustments and institutional reforms to address the mismatch between supply and demand and improve TFP. The mismatch is exhibited at the supply side and arises from structural contradictions and must be addressed through reforms. Supply-side structural reforms can be analyzed at the levels of firms, industries and government to arrive at theoretical and systematic conclusions that offer practical guidance. Based on this perspective, this paper proposes policy recommendations on how to deal with zombie firms, reduce cost for manufacturing companies, deepen SOE reforms, eliminate overcapacity, implement "Made in China 2025" and Internet+ strategies, promote Beijing-l^anjin-Hebei integrated development, as well as develop the Yangtze River Economic Belt and the old industrial bases of the northeast. 展开更多
关键词 supply-side structural reforms economic structure momentum structure andinstitutional mechanisms
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Hybrid molecular nanostructures with donor-acceptor chains
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作者 YANG Liu GUAN CuiZhong +8 位作者 YUE Wan WU JingYi YAN HuiJuan ZHANG Xu WANG ZhaoHui ZHAN XiaoWei LI YuLiang WANG Dong WAN LiJun 《Science China Chemistry》 SCIE EI CAS 2013年第1期124-130,共7页
We have fabricated hybrid molecular chain structures formed by electron acceptor compound 1 and electron donor molecules 2 and 3 at the liquid/solid interface of graphite surface.The structural details of the mono-com... We have fabricated hybrid molecular chain structures formed by electron acceptor compound 1 and electron donor molecules 2 and 3 at the liquid/solid interface of graphite surface.The structural details of the mono-component and the binary assemblies are revealed by high resolution scanning tunneling microscopy (STM).Compound 1 can form two well-ordered lamellar patterns at different concentrations.In the co-adsorption structures,compounds 2 and 3 can insert into the space between molecular chains of compound 1 and form large area well-ordered nanoscale phase separated lamellar structures.The unit cell parameters for the coassemblies can be "flexibly" adjusted to make the electron donors and acceptors perfectly match along the molecular chains.Scanning tunneling spectroscopy (STS) results indicate that the electronic properties of individual molecular donors and acceptors are preserved in the binary self-assembly.These results provide molecular insight into the nanoscale phase separation of organic electron acceptors and donors on surfaces and are helpful for the fabrication of surface supramolecular structures and molecular devices. 展开更多
关键词 phase separation donor and acceptor self-assembly hybrid molecular nanostructure liquid/solid interface
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Lagrangian view of time irreversibility of fluid turbulence
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作者 HaiTao Xu 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2016年第1期7-15,共9页
A turbulent flow is maintained by an external supply of kinetic gradients. The scale at which energy is supplied greatly differs energy, which is eventually dissipated into heat at steep velocity from the scale at whi... A turbulent flow is maintained by an external supply of kinetic gradients. The scale at which energy is supplied greatly differs energy, which is eventually dissipated into heat at steep velocity from the scale at which energy is dissipated, the more so as the turbulent intensity (the Reynolds number) is larger. The resulting energy flux over the range of scales, intermediate between energy injection and dissipation, acts as a source of time irreversibility. As it is now possible to follow accurately fluid particles in a turbulent flow field, both from laboratory experiments and from numerical simulations, a natural question arises: how do we detect time irreversibility from these Lagrangian data? Here we discuss recent results concerning this problem. For Lagrangian statistics involving more than one fluid particle, the distance between fluid particles introduces an intrinsic length scale into the problem. The evolution of quantities dependent on the relative motion between these fluid particles, including the kinetic energy in the relative motion, or the configuration of an initially isotropic structure can be related to the equal-time correlation functions of the velocity field, and is therefore sensitive to the energy flux through scales, hence to the irreversibility of the flow. In contrast, for single- particle Lagrangian statistics, the most often studied velocity structure functions cannot distinguish the "arrow of time". Recent observations from experimental and numerical simulation data, however, show that the change of kinetic energy following the particle motion, is sensitive to time-reversal. We end the survey with a brief discussion of the implication of this line of work. 展开更多
关键词 fluid turbulence time irreversibility energy cascade Lagrangian description
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