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1.
鲜切花凋萎的原因及其保鲜包装技术研究   总被引:4,自引:3,他引:1  
从植物生理学和生物化学出发,根据鲜切花的膨压理论、生理代谢,乙烯作用机制和病菌污染等多种主要作用机量,分析了鲜切花产生衰老,凋萎的内部因素和外部影响,介绍了目前国内外在植物保鲜方面的方法和措施,进一步对鲜切花的保鲜包装技术及其所涉及的包装方法,包装材料及相关技术进行了探讨。  相似文献   

2.
社会更加和谐是全面建设小康社会的目标之一。社会主义和谐社会首先应是一个法治社会,建设社会主义和谐社会必须重视传统法律文化的影响。我国传统法律文化博大精深,良莠不齐,对建设社会主义和谐社会而言,既有有利之处,也有不利的地方,必须在严格区分的基础上加以继承、批判和改造。  相似文献   

3.
海洋鱼类人工繁殖和苗种培育高新技术的研究进展和前景   总被引:1,自引:0,他引:1  
发展海洋鱼类的增殖和养殖是海洋鱼类资源的合理开发利用与持续性发展的根本措施和策略。因此,发展和提高海洋鱼类的增殖养殖技术,特别是做为增养殖基础的人工繁殖和苗种培育新技术,是海洋生物技术的一个重要研究领域。近年来在诱导海洋鱼类性腺发育成熟和改善卵子质量、排卵与产卵、提早性成熟和性别转换,调控海洋养殖鱼类在全年都能性腺发育成熟和产卵、改善幼苗培育与提高成活率和成长率以及采用基因工程技术生产各种促进鱼类生殖与生长的激素与神经肽等方面都取得明显进展,并且显示良好的生产应用前景。  相似文献   

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This article traces the metrological history of radiocarbon, from the initial breakthrough devised by Libby, to minor (evolutionary) and major (revolutionary) advances that have brought 14C measurement from a crude, bulk [8 g carbon] dating tool, to a refined probe for dating tiny amounts of precious artifacts, and for “molecular dating” at the 10 µg to 100 µg level. The metrological advances led to opportunities and surprises, such as the non-monotonic dendrochronological calibration curve and the “bomb effect,” that gave rise to new multidisciplinary areas of application, ranging from archaeology and anthropology to cosmic ray physics to oceanography to apportionment of anthropogenic pollutants to the reconstruction of environmental history.Beyond the specific topic of natural 14C, it is hoped that this account may serve as a metaphor for young scientists, illustrating that just when a scientific discipline may appear to be approaching maturity, unanticipated metrological advances in their own chosen fields, and unanticipated anthropogenic or natural chemical events in the environment, can spawn new areas of research having exciting theoretical and practical implications.  相似文献   

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