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1多囊肾的感染发病机制研究显示文摘多囊肾被认为是一种常见的人类遗传性疾病 ,但近年来许多研究表明该病可能为一种在易感人群中发生的感染性疾病 ,通过 L AL试验可在多囊肾患者的囊液中找到细菌内毒素和真菌 (1→ 3)β- D葡聚糖。囊液中的脂肪酸分析确定了内毒素特征性的 3- OH脂肪酸的存在。血清学试验揭示患者囊液中有孢子菌属抗原 ,抗镰刀菌属及念珠菌 Ig E抗体。对 PKD而言 ,感染性疾病 。苏瑛 许冀闽 高峻岭 2000国外医学(遗传学分册)2000,23,4:2
2INFLUENCE OF PROCESSING ON SHAPE MEMORY EFFECT OF Fe-Mn-Si-Ni-C-RE SHAPE MEMORY ALLOY显示文摘Effect of carbon, compound RE, quenching temperature, pre-strain and recovery temperature on shape memory effect (SME) of Fe-Mn-Si-Ni-C-RE shape memory alloy was studied by bent measurement, thermal cycle training, SEM etc. It was shown that the grains of alloys addition with .compound RE became finer and SME increased evidently. SME of the alloy was weakening gradually as carbon content increased under small strain (3%o). But in the condition of large strain (more than 6%), SME of the alloy whose carbon content range from 0.1% to 0.12% showed small decreasing range, especially of alloy with the addition of compound RE. Results were also indicated that SME was improved by increasing quenching temperature (>1000℃). The amount of thermal induced martensite increased and the relative shape recovery ratio could be increased to more than 40% after 3-4 times thermal training. The relative shape recovery ratio decreased evidently depending on rising of pre-strain. Furthermore, because speed of martensite transition was extremely great under higher tempering temperature (more than 450℃), ε→γtransition completed in 1os meanwhile the relative shape recovery ratio of the alloy increased rapidly.N.C. Si, Z.H. Jia and L.B. QiSchool of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China 2003Acta Metallurgica Sinica(English Letters)2003,16,5:0
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