9 research outputs found
Constituents research of Cayratia japonica(Thunb.) Gagnep and its activite ingredient research
乌蔹莓是我国传统的中药,在我国具有悠久的用药历史,早在《唐本草》中就有了关于其药理作用的介绍。如今,已知其药理活性多样,临床应用广泛,如治疗腰椎间盘推出,促进生长,抗菌抗病毒等,但对于其抗肿瘤活性方面研究较少。本研究对乌蔹莓具有抗肿瘤作用的活性成分进行了初步研究。结果发现,乌蔹莓中含有可以明确杀死肿瘤细胞的活性成分。 本文对乌蔹莓的60%乙醇提取物的大孔吸附树脂60%乙醇和95%乙醇洗脱部分进行了分离,综合运用硅胶柱色谱、ODS柱色谱、凝胶柱色谱、分析型HPLC、制备型HPLC及重结晶等方法从以上两个洗脱部分中分离得到了21个化合物。通过NMR、质谱、熔点及理化性质等对化合物的结构进行了鉴定...Cayratia japonica (Thunb.)Gagnep is a traditional Chinese medicine. It was first introduced by 《Tang Ben Cao》and had been used with long history in our country. Today, it’s diverse pharmacological activity and clinical application is reported on the treatment of lumbar disc, promoting rat growth, antibacterial and antiviral, etc. However, its antitumor activity study is still not concerned. In thi...学位:理学硕士院系专业:生物医学研究院_化学生物学专业学号:3052009115222
乌蔹莓化学成分的初步探究
目的:系统性研究福建道地药材乌蔹莓的有效成分。方法:运用大孔树脂,Sephadex LH-20,ODS及正相硅胶柱等色谱手段对乌蔹莓Cayratia japonica的全草进行分离。结果:从中得到13个化合物,通过多种波谱数据分析鉴定化合物结构,确定其分别为木犀草素(1),芹菜素(2),柠檬酸三乙酯(3),吲哚-3-甲醛(4),秦皮乙素(5),邻苯二甲酸二乙基己酯(6),calendin(7),反式咖啡酸乙酯(8),木犀草素7-O-葡萄糖苷(9),5-hydroxy-3,4-dimethyl-5-pentyl-2(5H)-furanone(10),3,4-二羟基苯甲酸乙酯(11),圣草酚(12),胡萝卜苷(13)。结论:其中3~8及10~12均为首次从乌蔹莓中分离得到
流化床中燃烧高水高氮酒糟的NO排放特性
采用流化床反应器,研究富水蒸气条件下酒糟燃烧的NO排放特性。结果表明,增加过量空气系数和升高燃烧温度,NO 排放浓度升高;对送入燃烧反应器的气体中添加水蒸气模拟高水分燃料燃烧有效地降低了酒糟燃烧的NO排放浓度及总排放量,且在适当条件下可减少NO排放约46%(质量)。酒糟灰分中的金属氧化物对NO的还原有催化作用,且随着温度的升高变强。在含H2或CO的N2气氛中,灰分对NO催化还原作用更明显。水蒸气本身对NO没有明显还原作用,说明水蒸气是通过与碳氢化合物反应生成还原性气体,如H2和CO,从而在酒糟灰催化作用下强化NO的还原
流化床中燃烧高水高氮酒糟的NO排放特性
采用流化床反应器,研究富水蒸气条件下酒糟燃烧的NO排放特性。结果表明,增加过量空气系数和升高燃烧温度,NO 排放浓度升高;对送入燃烧反应器的气体中添加水蒸气模拟高水分燃料燃烧有效地降低了酒糟燃烧的NO排放浓度及总排放量,且在适当条件下可减少NO排放约46%(质量)。酒糟灰分中的金属氧化物对NO的还原有催化作用,且随着温度的升高变强。在含H2或CO的N2气氛中,灰分对NO催化还原作用更明显。水蒸气本身对NO没有明显还原作用,说明水蒸气是通过与碳氢化合物反应生成还原性气体,如H2和CO,从而在酒糟灰催化作用下强化NO的还原
流化床中燃烧高水高氮酒糟的NO排放特性
采用流化床反应器,研究富水蒸气条件下酒糟燃烧的NO排放特性。结果表明,增加过量空气系数和升高燃烧温度,NO 排放浓度升高;对送入燃烧反应器的气体中添加水蒸气模拟高水分燃料燃烧有效地降低了酒糟燃烧的NO排放浓度及总排放量,且在适当条件下可减少NO排放约46%(质量)。酒糟灰分中的金属氧化物对NO的还原有催化作用,且随着温度的升高变强。在含H2或CO的N2气氛中,灰分对NO催化还原作用更明显。水蒸气本身对NO没有明显还原作用,说明水蒸气是通过与碳氢化合物反应生成还原性气体,如H2和CO,从而在酒糟灰催化作用下强化NO的还原
Prediction of Energy Resolution in the JUNO Experiment
International audienceThis paper presents the energy resolution study in the JUNO experiment, incorporating the latest knowledge acquired during the detector construction phase. The determination of neutrino mass ordering in JUNO requires an exceptional energy resolution better than 3% at 1 MeV. To achieve this ambitious goal, significant efforts have been undertaken in the design and production of the key components of the JUNO detector. Various factors affecting the detection of inverse beta decay signals have an impact on the energy resolution, extending beyond the statistical fluctuations of the detected number of photons, such as the properties of liquid scintillator, performance of photomultiplier tubes, and the energy reconstruction algorithm. To account for these effects, a full JUNO simulation and reconstruction approach is employed. This enables the modeling of all relevant effects and the evaluation of associated inputs to accurately estimate the energy resolution. The study reveals an energy resolution of 2.95% at 1 MeV. Furthermore, the study assesses the contribution of major effects to the overall energy resolution budget. This analysis serves as a reference for interpreting future measurements of energy resolution during JUNO data taking. Moreover, it provides a guideline in comprehending the energy resolution characteristics of liquid scintillator-based detectors
