旋转地质导向技术在钻探哈得油田薄砂层油藏中的应用

塔里木哈得油田多采用双台阶水平井钻井,主要难题为常规钻井技术井眼轨迹控制难,储层钻遇率低,钻井周期长。1m厚薄砂层油藏未能实现有效开发,东河砂岩水窜严重,油水分布混乱,影响后期开发效果。针对以上难题,在哈得油田钻井中引进旋转地质导向技术,与常规技术相比应用效果良好,平均储层钻遇率由55.43%提高至87.84%,平均单井日产量提高1倍,单井水平段节约钻井工期15d,成功地解决了薄油层钻井储层钻遇率低、钻井施工进度慢等难题。     

Aging-like Spontaneous Epigenetic Silencing Facilitates Wnt Activation,Stemness, and BrafV600E-Induced Tumorigenesis

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IL-17在小鼠肾脏缺血再灌注损伤表达的变化及意义

目的:观察小鼠肾脏缺血再灌注损伤(IR)后不同时间点的血清及肾组织中白细胞介素-17(IL-17)的变化情况。方法:将C57BL/6雄性小鼠随机分为两组。假手术组(n=20)小鼠仅暴露腹腔游离肾蒂,30分钟后关闭腹腔;IR组(n=20)采用100g压力无创血管夹夹闭双侧肾蒂,30分钟后去除,恢复血流。于肾脏IR手术再灌注后3、6、12、24小时收集小鼠血浆及肾脏标本,用全自动生化仪分析血清中肌酐(SCr)与尿素氮(BUN)含量;用HE染色法观察小鼠肾脏组织病理变化;应用酶联免疫吸附法(ELISA)检测不同时间点小鼠血清及肾脏组织中IL-17的含量。结果:肾脏IR诱导小鼠血清BUN、SCr水平显著增高,肾小管坏死率也显著增加,均于IR后24小时达高峰,与假手术组小鼠3、6、12及24小时同时间点相比较,差异有统计学意义(P0.01);小鼠血清及肾组织中IL-17含量也随病情进展表现出升高趋势,IR后24小时达顶峰,与假手术组同时间点相比,差异均具有统计学意义(P0.01)。结论:小鼠肾IR后血清及肾组织中IL-17表达明显增加,大量IL-17表达与肾IR后炎症反应的发生密切相关。IL-17的大量表达可能对小鼠肾脏功能损伤及病理改变有诱导或促进作用。     

Expression of long non-coding RNA LOC285194 and its prognostic significance in human pancreatic ductal adenocarcinoma

Introduction: Dysregulation of long non-coding RNAs (lncRNAs) plays critical roles in tumor progression. lncRNA LOC285194 was previously shown to be correlated with aggressive clinicopathological features and poor prognosis in several cancers. The aim of this study was to investigate relationship between LOC285194 expression and clinical outcomes in human pancreatic ductal adenocarcinoma (PDAC). Methods: Quantitative real-time PCR (qRT-PCR) assay was performed to detect the expression of lncRNA LOC285194 in human PDAC cells and tissue samples. The association of LOC285194 expression with clinicopathologic features was analyzed. Kaplan-Meier analyses were used to assess survival of patients. Univariate and multivariate analyses were performed using the Cox proportional hazards model to analyze the prognostic significance of LOC285194 expression. Results: Our data showed that the relative level of LOC285194 in PDAC cells was significantly lower than that in normal human pancreatic duct epithelial cell line. Also, the expression of LOC285194 in PDAC tissues was significantly lower than that in adjacent non-tumor tissues. By statistical analyses, low LOC285194 expression was observed to be closely correlated with clinical stage, lymphnode metastasis and liver metastasis. Kaplan-Meier survival analysis revealed that patients with low LOC285194 expression had a poor overall survival compared with the high LOC285194 group (P < 0.05). Univariate and multivariate analyses showed that low LOC285194 expression was an independent poor prognostic factor for PDAC patients. Conclusions: Our data provided the first evidence that reduced LOC285194 in PDAC tissues was correlated with tumor progression, and lncRNA LOC285194 might be a potential molecular biomarker for predicting the prognosis of patients.     

Relation between the development of osteoporosis and osteonecrosis following glucocorticoid in a rabbit model

Background:There has been a recent increase in the number of patients suffering from bone and joint diseases, as a consequence of corticosteroids administration. There are more patients treated with low dose of GCs under long-term conditions in clinical, such as effect of GCs on Rheumatoid arthritis, Crohn''s disease and Asthma patients. Hence, it was difficult for doctor to determine which problem occur first – OP or ON; however, there was no clinical report previously in the literature, and there was no effective animal model of OP and ON about low dose GCs. This study was conducted to develop rabbit models of glucocorticoid (GC)-induced femoral head ON and OP and to investigate the temporal relationship between the occurrence of the two events following administration of glucocorticoids.Results:At 4 weeks in the GC group, the BMD of the femur reduced 33% and 22% in the femoral head and shaft; there was irregular intermediate to high T2-weighted images signals; μ-CT showed microfractures and cystic changes in the femoral head and L4 at 4 weeks. At 8 weeks in the GC group, the classical “line-like sign” indicating ON of the femoral head was observed in 64.3% of the rabbits.Conclusion:A rabbit model of GC-induced OP and ON was developed by repetitive injection with small doses of GCs in the gluteal region. OP was observed at 4 weeks while ON developed at 8 weeks and followed a clear temporal pattern.