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Cecilia Castro Laura Gazza Roberto Ciccoritti Norberto Pogna Cesare Oliviero Rossi Cesare Manetti 《Journal of Cereal Science》2010
Spikes and seeds from diploid ‘einkorn’ wheat Triticum monococcum and two near-isogenic hard and soft common wheat (Triticum aestivum) lines were harvested at regular intervals from 7 days post-anthesis (dpa) and analysed by non-destructive magnetic resonance imaging (MRI) and time domain-nuclear magnetic resonance (TD-NMR). A large amount of free water occurred in rachises, glumes and awns of spikes collected at 7 dpa, and accumulated in the physiologically active cells of the endosperm at 21 dpa. In the final stages of kernel development, awns and seed embryos exhibited a high MR signal due to the presence of free water likely associated with biological activities. TD-NMR relaxation time distributions obtained by discrete exponential fitting, distributed exponential fitting and SLICING multivariate analysis offered detailed information on mobility behaviour of water molecules in developing seeds and were able to differentiate two soft and hard isolines from common wheat cv. Enesco at early stages of seed development. 相似文献
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基于时域核磁共振技术,对3个热处理温度(120、170和220℃)下MDF(中密度纤维板)的吸水性进行了研究,并利用X射线衍射技术,辅助揭示不同样品吸水性差异的机理。结果表明,170℃处理MDF吸水过程中吸水率、自由水和结合水含量最低;220℃热处理MDF的纤维素结晶区被破坏,原有的空隙结构被改变,吸水率、自由水和结合水含量最高。 相似文献
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