期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
碳-单体同位素分析(C-CSIA)技术用于葡萄糖液化机理研究 被引量:2
1
作者 郭康 沈娟章 +2 位作者 蒋剑春 徐俊明 谭卫红 《质谱学报》 EI CAS CSCD 北大核心 2020年第6期604-613,I0005,共11页
建立了碳-单体同位素分析(C-CSIA)技术测定葡萄糖液化产物中特定目标化合物的碳稳定同位素比值分析方法,分析得到的单体化合物δ13 C值误差小于0.3‰,低于仪器测试允许的偏差(0.5‰)。当葡萄糖在不同温度下液化时,对比了中间产物1,4;3,6... 建立了碳-单体同位素分析(C-CSIA)技术测定葡萄糖液化产物中特定目标化合物的碳稳定同位素比值分析方法,分析得到的单体化合物δ13 C值误差小于0.3‰,低于仪器测试允许的偏差(0.5‰)。当葡萄糖在不同温度下液化时,对比了中间产物1,4;3,6-二脱水-α-d-吡喃葡萄糖(DGP)的碳稳定同位素变化及分馏特征。发现温度较低时,DGP发生显著的碳稳定同位素贫化效应,温度越高,DGP分子的碳稳定同位素富集因子越大。此外,在葡萄糖脱水生成DGP过程中仅发生C—O、C—H键的断裂及形成,而在DGP生成乙酰丙酸乙酯过程中,因脱羧、重排异构化反应等,不仅发生了C—O、C—H键断裂及形成,还有C—C键参与反应,导致后者具有更显著的碳稳定同位素动力学效应。该方法适用于葡萄糖催化液化等复杂体系的反应路径研究,可为液化机理研究提供信息。 展开更多
关键词 单体同位素分析(CSIA) 葡萄糖液化 液化机理 同位素分馏 动力学同位素效应
下载PDF
Short-term application of low-dose growth hormone in surgical patients: Effects on nitrogen balance and blood glucose 被引量:2
2
作者 Ming-Ming Zhang Xiao-Ting Wu +2 位作者 Yong Zhou Kun Qian Ya-Min Zheng 《World Journal of Gastroenterology》 SCIE CAS CSCD 2007年第3期452-456,共5页
AIM: To investigate the effectiveness and safety of recombinant human growth hormone (rhGH) in postoperative patients. METHODS: A total of 48 consecutive patients undergoing abdominal operations were randomized to... AIM: To investigate the effectiveness and safety of recombinant human growth hormone (rhGH) in postoperative patients. METHODS: A total of 48 consecutive patients undergoing abdominal operations were randomized to receive either subcutaneous rhGH (0.15 IU/kg) or placebo (menstruum) injections daily for 7 d after surgery. The two groups had similar nutritional intake. Blood samples for serum fibronecUn, albumin, prealbumin, transferrin and the total lymphocyte count, as well as glucose levels were collected to study the rhGH effect. Basal laboratory evaluation, and nutritional status were estimated on d 1 before as baseline and d 3 and 10 after operation using standard laboratory techniques. Nitrogen balance was measured from d 3 to 9 after operation. RESULTS: The cumulative nitrogen balance was significantly improved in rhGH group compared with the placebo group (11.37 ± 16.82 vs -9.11 ± 17.52, P = 0.0003). Serum fibronectin was also significantly higher in the rhGH group than in the placebo group (104.77 ± 19.94 vs 93.03 ± 16.03, P 〈 0.05), whereas changes in serum albumin, prealbumin, transferrin and total lymphocyte counts were not statistically significant. Mean blood glucose levels were significantly higher in the rhGH group from d 3 to 6 after operation. CONCLUSION: If blood glucose can be controlled, lowdose growth hormone together with hypocaloric nutrition is effective on improving positive nitrogen balance and protein conservation and safe is in postoperative patients. 展开更多
关键词 Growth hormone Nutritional support Abdominal surgery HYPERGLYCEMIA Nitrogen balance
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部