肝硬化肝切除术后肝再生及评估指标研究

原发性肝癌是我国的常见病、多发病,且90%的患者合并有肝硬化,肝切除术是主要的治疗方法,而肝脏在受到损害或切除之后,可以显示出强大的再生能力,这一现象早已被人们所发现并研究.就肝硬化肝切除术后肝再生、肝再生受损机制以及肝再生评估予以综述.     

大鼠肝大部分切除对血及肝组织中cAMP、ATP含量变化的影响

目的：观察大鼠大部分肝切除后3天时血浆及肝组织中cAMP、ATP含量变化与肝再生的影响。方法：用液体闪烁计数仪和高效液相色谱仪分别测定cAMP及ATP含量。结果：大鼠大部分肝切除后血中和肝组织中cAMP含量明显高于正常对照组,肝组织ATP含量也明显增高,与肝重增长呈明显正相关关系。结论：肝再生时许多物质参与调控,可能与cAMP的传递密切相关,同时与能量代谢也有一定的关系。     

Influence of floodwater irrigation on vegetation composition and vegetation regeneration in a Taklimakan desert oasis

Naturally occurring floods in the summer months are the main source of surface water application in the foreland of Qira oasis, which is characterized by a hyperarid climate and is located at the southern fringe of the Taklimakan Desert. We investigated the impact of repeated artificial flood irrigation on seedling recruitment and growth of Alhagi sparsifolia and Karelinia caspica plant communities which are part of the dominant vegetation in Qira oasis. Flood irrigation was applied three times during the growing season and we studied the effect of irrigation on species recruitment, vegetation growth, spe- cies composition, and changes in soil water and nutrient concentrations in the soil profile. Results show that (1) repeated flood irrigation had a positive effect on seedling recruitment of the two species, with vegetative recruitment via root tillers being more important than seed recruitment for both species. (2) Irrigation promoted the germination and establishment of herbaceous weed species, which in- creased species diversity as well as ground coverage. (3) Irrigation also increased soil water and soil nutrient concentrations in the upper soil layer and changed the soil nutrients in the vertical profile. Available N, P, K and the total P and K increased in the soil profile. Our study demonstrates that naturally occurring flood irrigation has significant ecological benefits and plays an important role in promoting the renewal of desert vegetation and a short-term increase of soil nutrients. Our study also highlights the potential negative consequences for vegetation composition and rejuvenation if naturally occurring floods in the study area are diminished by either the effects of climate change or human management.     

氮气分压比对硼碳氮薄膜的组分及光学带隙的影响

采用射频磁控溅射方法以不同的氮气分压比(1/10～2/3)制备出一组硼碳氮薄膜.傅里叶变换红外光谱(FTIR)和X射线光电子能谱(XPS)测量发现样品的组成原子之间均实现了原子级化合.XPS测量结果表明,所有样品中的B、N原子比近似为1:1,其化学配比为BCx N(0.16＜x＜1.46).紫外/可见/近红外分光光度计用于测量样品的吸收光谱.由吸收谱线在低能区域(2.0～3.0 eV)的光吸收,利用关系作图法求出光学带隙Eopt范围为0.17～0.83 eV.氮气分压比对薄膜的组分和光学带隙有很大影响,其通过改变薄膜组分而影响光学带隙,并且碳原子数小的样品具有较宽的光学带隙.以氮气分压比为1/3条件下制备的样品中碳原子数最小,它的光学带隙最宽为0.83 eV.     

低氧对新生大白鼠肝和心肌组织LDH活性的影响

本文研究了在模拟低氧下，从出生至第28天的新生大白鼠的肝和心肌组织的LDH活性的变化。结果表明新生大白鼠肝组织LDH活性随模拟低氧时间的增长明显升高，而心肌组织LDH活性无明显变化。认为发育大白鼠LDH活性变化与组织缺氧程度有关。     

玉液汤对气阴两虚型糖尿病大鼠血糖与胰岛素受体的影响

目的：探讨玉液汤疗效及其降糖的分子机理。方法：用佐脲链菌素复制糖尿病大鼠模型,随机分为正常组、模型组、治疗组和对照组,分别给与蒸馏水、玉液汤和消渴丸,观察血糖、血脂、糖化血红蛋白、胰岛素水平和肝脏胰岛素受体、受体底物1基因表达水平。结果：注射SMZ后动物血糖、血脂、糖化血红蛋白明显升高,胰岛素水平明显降低,两组均能明显降低糖尿病大鼠血糖、血脂、糖化血红蛋白水平、提高糖尿病大鼠胰岛素的水平,与模型组比较差异有统计学意义（P<0.05）,治疗组与对照组两组间比较差异无统计学意义（P >0.05）;治疗组与对照组均能增加糖尿病大鼠肝脏IR、IRS-1m RNA水平,与模型组比较差异有统计学意义（P<0.05）,治疗组与对照组两组间比较差异无统计学意义（P >0.05）。结论：玉液汤能降低糖尿病大鼠血糖、提高胰岛素水平,其机理可能是影响胰岛素受体-受体底物实现的。