系统性硬化症的表观遗传学研究进展

系统性硬化症(systemic sclerosis,SSc)是一类病因不明的自身免疫性疾病,以血管病变、炎症和皮肤及各器官广泛纤维化为主要特征。纤维化是SSc的标志,也是导致其高病死率的主要原因。近年来,SSc的表观遗传学(DNA甲基化、组蛋白修饰和非编码RNA)得到了深入的研究,其中以DNA甲基化和微小RNA(microRNA,miRNA)的研究最为广泛。DNA甲基化异常可影响SSc的血管内皮细胞、CD4+T细胞和成纤维细胞的功能。血清中的miRNAs与自身抗体、SSc疾病活动度和并发症密切相关,成纤维细胞中的miRNAs可直接影响成纤维细胞的活化。

Soil-cement mixture properties and design considerations for reinforced excavation

soil-cement is a mixture produced by grouting or mixing cement with soils. This paper reviews and discusses the general classifications of grouting techniques and the suitability of their applications.The mechanical properties of soil-cement mixture and the influence of sodium silicate added are discussed. Design considerations for deep soil mixed wall(DSMW) for excavation support and vault arch for tunnelling stabilisation are presented. Parameters for the numerical analysis of soil-cement mixture are evaluated and recommended.