High resolution mass spectrometry in combination with distillation and SARA fractionation provides us an opportunity for in-depth understanding about the hydrotreating process at the molecular level. In this study, th...High resolution mass spectrometry in combination with distillation and SARA fractionation provides us an opportunity for in-depth understanding about the hydrotreating process at the molecular level. In this study, the atmospheric residue derived from Arabian heavy crude and its hydrotreated products were initially subjected to distillation and SARA fractionation. The saturates were characterized by GC FI/FD TOF MS. The aromatics and resins were characterized by APPI FT-ICR MS. Compositional changes of different compounds (paraffins, naphthenes, aromatic hydrocarbons, and heteroatomic compounds) contained in different distillates (vacuum gas oil, vacuum residue) were obtained. More detailed knowledge about the hydrotreating process was achieved.展开更多
文摘目的 :采用循证医学的方法评价体部立体定向放疗联合化疗治疗晚期胰腺癌的临床效果。方法:通过检索中国知网、万方、维普、Pub Med、Embase数据库,收集有关体部立体定向放疗联合化疗治疗晚期胰腺癌相临床研究,检索时限均从建库至2021年6月。依据事先设置的文献纳入与排除标准,筛选出符合要求的临床研究,应用Rev Man 5.3软件进行Meta分析。结果:共纳入21项临床研究,总计1738例患者。Meta分析结果显示,对于晚期胰腺癌患者,使用立体定向放疗联合化疗与单独化疗比较,有较好的客观有效率(Z=9.59,P<0.001,OR=4.71,95%CI:3.43~6.46)、1年生存率(Z=5.00,P<0.001,OR=2.36,95%CI:1.69~3.31)、2年生存率(Z=3.61,P<0.001,OR=2.76,95%CI:1.59~4.79),骨髓抑制发生率(Z=0.07,P=0.95,OR=0.98,95%CI:0.51~1.87)和消化道反应发生率(Z=0.01,P=0.99,OR=1.0,95%CI:0.58~1.72)差异无统计学意义;使用立体定向放疗联合化疗与单独体部立体定向放疗比较,有较高的客观有效率(Z=4.97,P<0.001,OR=2.68,95%CI:1.82~3.95)、2年生存率(Z=4.40,P<0.001,OR=3.86,95%CI:2.11~7.04)和骨髓抑制发生率(Z=2.49,P=0.01,OR=4.51,95%CI:1.38~14.72),1年生存率Z=0.84,P=0.40,OR=1.46,95%CI:0.60~3.54)和消化道反应发生率(Z=0.84,P=0.40,OR=1.68,95%CI:0.50~5.57)差异无统计学意义。结论:立体定向放疗联合化疗治疗晚期胰腺癌有较好的临床效果,这些结果还需要未来在大样本、高质量的随机对照试验中进行评估。
基金supported by the National Basic Research Program of China (2010CB226901)
文摘High resolution mass spectrometry in combination with distillation and SARA fractionation provides us an opportunity for in-depth understanding about the hydrotreating process at the molecular level. In this study, the atmospheric residue derived from Arabian heavy crude and its hydrotreated products were initially subjected to distillation and SARA fractionation. The saturates were characterized by GC FI/FD TOF MS. The aromatics and resins were characterized by APPI FT-ICR MS. Compositional changes of different compounds (paraffins, naphthenes, aromatic hydrocarbons, and heteroatomic compounds) contained in different distillates (vacuum gas oil, vacuum residue) were obtained. More detailed knowledge about the hydrotreating process was achieved.
