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单结合型胆红素与胆石形成的关系 被引量:7
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作者 李荣 祝学光 +1 位作者 韩建德 黄萃庭 《中华实验外科杂志》 CAS CSCD 北大核心 1995年第1期50-51,共2页
观察实验性胆结石豚鼠的胆汁和胆石、人类各型胆结石及胆汁保温沉淀和溶血性黄疸模型动物的胆汁中胆红素组分的含量及变化。发现:成石豚鼠的胆石及胆囊胆汁中,存在较高比例的单结合胆红素(MCB),分别占总胆红素的1/3和2/3。MCB在人类胆... 观察实验性胆结石豚鼠的胆汁和胆石、人类各型胆结石及胆汁保温沉淀和溶血性黄疸模型动物的胆汁中胆红素组分的含量及变化。发现:成石豚鼠的胆石及胆囊胆汁中,存在较高比例的单结合胆红素(MCB),分别占总胆红素的1/3和2/3。MCB在人类胆红素石和胆固醇石的核心中分别占总色素的2.3%和14.9%,而黑色结石中则有一种MCB异构体的色素占9.6%。MCB%和UCB%在保温孵育的人胆汁上清和沉淀中含量相当,双结合型胆红素(DCB)仅存在于上清液中。MCB在溶血性黄疸动物胆汁中的含量高于UCB。以上结果表明MCB与胆汁淤滞和胆泥沉积有关,可能参与胆色素沉淀过程及结石形成。 展开更多
关键词 单结合型 胆红素 结合 胆结石 病因
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Effects of Horizontal Density Distribution on Internal Bond Strength of Flakeboard
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作者 MEIChangtong DAIChunping ZHOUDingguo 《Chinese Forestry Science and Technology》 2005年第2期58-65,共8页
Horizontal density variation is a structural phenomenon of non-veneer wood composites. The variation and distribution characteristics of horizontal density have impacts on the products properties. In this study, venee... Horizontal density variation is a structural phenomenon of non-veneer wood composites. The variation and distribution characteristics of horizontal density have impacts on the products properties. In this study, veneer strip simulated flake boards with 4 kinds of density distribution were made using a mat model. The density variation of the modeled mats was discussed, as well as the relationship between sample size and density variation. The effects of density and density distribution of non-veneer composites on the internal bond strength were analyzed. Result shows that the horizontal density of random formed particleboard follows normal distribution. Density has remarkable influence on internal bond strength (IB). Increasing density helps to improve IB at lower density stage, but has negative impacts on IB at higher density stage. Density variation between testing specimens depends on their sizes. Properly increasing specimen size can decrease the variation of the IBs. 展开更多
关键词 horizontal density distribution internal bond strength non-veneer wood composites MODEL
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