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根据胶原生物矿化的原理和方法,制备不同条件下的明胶生物矿化样品,通过红外光谱分析,发现磷酸钙、氯化镁的存在引起明胶分子中酰胺Ⅰ、Ⅱ、Ⅲ带显著褪化,明胶生物矿化与胶原生物矿化的紫外光谱曲线也有相似之处,表明明胶与钙、镁离子存在配位作用,明胶也可能作为生物矿化的模板材料。 相似文献
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羌族文化被史学界称为＂中国的玛雅文化＂,本文将羌族文化的基本形态作了系统的梳理,并将其归纳为羌语、释比文化、萨朗文化、工艺（技艺）文化、艺体文化、宗教文化、习俗文化、传说文化以及岷江上游古文明与古蜀文化九个主要方面,阐述了各种表现形态的基本特点,指出了羌族文化保护中值得注意的倾向性问题。 相似文献
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A meta-analysis was conducted to examine the effects of exercise on anxiety. Because previous meta-analyses in the area included studies of varying quality, only randomized, controlled trials were included in the present analysis. Results from 49 studies show an overall effect size of -0.48, indicating larger reductions in anxiety among exercise groups than no-treatment control groups. Exercise groups also showed greater reductions in anxiety compared with groups that received other forms of anxiety-reducing treatment (effect size = -0.19). Because only randomized, controlled trials were examined, these results provide Level 1, Grade A evidence for using exercise in the treatment of anxiety. In addition, exercise dose data were calculated to examine the relationship between dose of exercise and the corresponding magnitude of effect size. 相似文献
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