共查询到17条相似文献，搜索用时 640 毫秒
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魔芋精粉中甘露聚糖含量的测定 总被引：2，自引：0，他引：2
魔芋精粉是由鲜魔芋块茎，经过干燥、机械粉碎、风选等工序得到的一种初级产品。魔芋精粉主要成分为甘露聚糖，其次还有淀粉、纤维素、蛋白质。游离还原糖等。魔芋甘露聚糖是由甘露糖和葡萄糖，通过β-（1→4）苷键和β-（1→3）苷键连接而成的高分子多糖（分子量达106）［1］。研究证明，魔芋甘露聚糖具有减肥作用，对血清胆固醇、肝胆固醇和中性脂肪的上升有明显的抑制作用，并具有调节代谢正常化和增强免疫功能的作用，被广泛应用于保健食品和医药上［2］。甘露聚糖含量是魔芋精粉质量的一个关键指标。目前，生产中仅以粘度的高低判断甘… 相似文献
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由西双版纳州林业局等单位组成的天然林资源保护工程社区发展调研项目组，调查了勐海县布朗山乡曼囡村以轮歇地为中心的社会经济情况，“天保”工程实施后对社区经济及环境的影响，村民的反映，并对存在问题以及解决办法进行了探讨。 相似文献
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The transfer matrix method of structural analysis was used to examine the hypothesis that tree stems grow to a shape that tends to equalize the average bending plus axial stresses to which they are subjected along their length. The method and computational procedures were checked by comparing computed height-diameter profiles with those calculated using elementary stress theory for trees with simple force distributions in the crown. Measured height-diameter profiles for trees were then taken from the literature and shown to be well-fitted by profiles calculated to give uniform stress along the stems, using the most realistic average forces and force distributions within the crowns. At high wind speeds, the height-diameter profile giving uniform stress was more tapered than the profile giving uniform stress at low wind speeds. The profile giving uniform stress was similar over the normal range of average wind speeds of 2.5 to 10.0 m s(-1) (at the top of the canopy). But a tree that had grown to give uniform stress along its stem in an average wind of 5 m s(-1) showed markedly decreased stress with height at wind speeds of about 15 m s(-1) or more, and increased stress with height (to the crown base) at wind speeds of about 1.25 m s(-1) or less. The fact that tree stems develop shapes in response to average conditions, but show varying stress distribution in extreme conditions, may help to explain some of the apparent evidence for non-uniform stress distribution in the literature. In general, our analysis supports the above hypothesis for the stem region above the butt swell. 相似文献
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The road effect on small rodent population is investigated at 8 fragmented forest areas in the Baekdudaegan moun-tain range, South Korea in September 2001, We especially focused on the distribution and body condition of small rodents near the roads, Korean field mouse (Apodemus peninsulae) seems to be more sensitive to the existence of a road than striped field mouse (Apodemus agradus), Korean field mouse prefers interior forest area to around road. Striped field mouse is a habitat generalist and has wide distributional range around road, but Korean field mouse is forest-inhabiting species and their distribu-tion is limited in forest area. These results suggest the effect of road is different on each small rodent species and their habitat preferences. 相似文献
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在对景观与功能的概念进行讨论、界定的基础上,对植物景观的功能进行了详细总结与分类;提出了植物功能景观的概念、内涵及主要类型,并指出其具体应用价值.认为:功能景观理论使景观设计更有目的性、更能发挥植物景观的综合效益;同时,使定量评价一个景观设计方案成为可能. 相似文献
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本研究针对家具生产企业在制品库存控制问题方面,从企业外部、企业内部运营管理及企业生产系统三个层面出发,提出其影响因素,并进行分析与总结. 相似文献