明胶与钙镁离子的配位作用     

蔡群 何英黄兆龙  白占鸿李秀晗 《蒙自师范高等专科学校学报》2005,3(6):10-12

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   

论羌族传统文化的基本类型与表现形式     

刘志荣  白珍  杨烨 《阿坝师范高等专科学校学报》2010,27(2):6-10

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   

Performance factors in associative learning: Assessment of the sometimes competing retrieval model     

JE Witnauer  BM Wojick  CW Polack  RR Miller 《Learning & behavior》2012,40(3):347-366

Previous simulations revealed that the sometimes competing retrieval model (SOCR; Stout & Miller, Psychological Review, 114, 759-783, 2007), which assumes local error reduction, can explain many cue interaction phenomena that elude traditional associative theories based on total error reduction. Here, we applied SOCR to a new set of Pavlovian phenomena. Simulations used a single set of fixed parameters to simulate each basic effect (e.g., blocking) and, for specific experiments using different procedures, used fitted parameters discovered through hill climbing. In simulation 1, SOCR was successfully applied to basic acquisition, including the overtraining effect, which is context dependent. In simulation 2, we applied SOCR to basic extinction and renewal. SOCR anticipated these effects with both fixed parameters and best-fitting parameters, although the renewal effects were weaker than those observed in some experiments. In simulation 3a, feature-negative training was simulated, including the often observed transition from second-order conditioning to conditioned inhibition. In simulation 3b, SOCR predicted the observation that conditioned inhibition after feature-negative and differential conditioning depends on intertrial interval. In simulation 3c, SOCR successfully predicted failure of conditioned inhibition to extinguish with presentations of the inhibitor alone under most circumstances. In simulation 4, cue competition, including blocking (4a), recovery from relative validity (4b), and unblocking (4c), was simulated. In simulation 5, SOCR correctly predicted that inhibitors gain more behavioral control than do excitors when they are trained in compound. Simulation 6 demonstrated that SOCR explains the slower acquisition observed following CS-weak shock pairings.  相似文献