素心蜡梅和红心蜡梅鲜花挥发油成分分析

用同时蒸馏萃取法(SDE)提取了素心蜡梅和红心蜡梅鲜花的挥发油,用气相色谱-质谱(GC-MS)联用技术对其挥发油的化学成分进行了分析鉴定。从素心蜡梅挥发油中鉴定出38种化学成分,占挥发油色谱总峰面积的92.214%;红心蜡梅中鉴定出42种化学成分,占挥发油色谱总峰面积的93.689%。素心蜡梅挥发油中相对质量分数较高的成分是z-木罗烯(18.128%)、z-榄香烯(13.640%)、L-乙酸龙脑酯(8.577%)、tau-杜松醇(7.771%)、β-荜澄茄烯(6.588%)等;红心蜡梅挥发油中相对质量分数较高的是榄香醇(16.171%)、z-榄香烯(12.758%)、β-荜澄茄烯(11.501%)、tau-杜松醇(4.649%)、石竹烯(3.947%)等。     

鱼香草挥发油成分的分析

用同时蒸馏萃取法(SDE)提取重庆地区鱼香草的挥发油,用气相色谱-质谱(GC/MS)联用技术对其挥发油成分进行了分析.从中鉴定了36种化学成分,占总挥发油质量的95.353%.用面积归一化法测定了各种成分的相对质量,结果表明,重庆地区鱼香草的主要挥发性成分是L-香芹酮(74.767%)、β-荜澄茄苦素(3.523%)、顺式-香芹醇(2.370%)、桉油精(1.856%)、黄樟油素(1.850%)、D-柠檬烯(1.437%)、L-4-松油醇(1.011%)等,7种成分质量占总挥发性成分质量的86.814%.     

瓦东干渠七里杠滑坡治理工程的监理

一、概述 淠史杭灌区瓦东干渠七里杠滑坡由相距80m的1~#、2~＃两处滑坡组成。1~#、2~＃滑坡的滑体顺渠向长度分别为135m和180m,垂直水流方向的宽度分别为60m和80m,滑坎(壁)分别为1.5m和3m,主滑舌伸进渠底最大长度分别为6m和10m(该处设计渠底宽度为19m)。安徽省水利厅同意采用钢筋混凝土抗滑桩结构支挡方案,并辅以削坡,明、暗排水等措施进行治理。该项工程自1998年2月10日开工,1999年6月底完工。治理范围的总长度为350m。采用井柱抗滑桩构架,桩的中心距为6.0m,抗滑桩为φ2.0m井柱,上端用顺坡撑梁支撑,下端埋入滑床面以下1.5m深度以维持稳定。 工程建设期间,成立了七里杠滑坡     

乳酸链球菌素——天然抗菌素

本文主要介绍了乳酸链球菌(Nisin)的性质,综述了乳酸链球菌(Nisin)的防腐机理,及其在肉类工业中的应用,并提出了乳酸链球菌(Nisin)具有广阔的发展前景。     

Catalytic performance of cerium iron complex oxides for partial oxidation of methane to synthesis gas

The cerium iron complex oxides oxygen carrier was prepared by the co-precipitation method. The reactions between methane and lattice oxygen from the complex oxides were investigated in a fixed micro-reactor system. The reduced oxygen carder could be re-oxidized by air and its initial state could be restored. The characterizations of the oxygen carders were studied using XRD, O2-TPD, and H2-TPR. The results showed that the bulk lattice oxygen of CeO2-Fe2O3 was found to be suitable for the partial oxidation of methane to synthesis gas. There were two kinds of oxygen species on the oxygen carrier： the stronger oxygen species that was responsible for the complete oxidation of methane, and the weaker oxygen species （bulk lattice oxygen） that was responsible for the selective oxidation of methane to CO and H2 at a higher temperature. Then, the lost bulk lattice oxygen could be selectively supplemented by air re-oxidation at an appropriate reaction condition. CeFeO3 appeared on the oxygen carrier after 10 successive redox cycles, however, it was not bad for the selectivity of CO and H2.     

利用基因工程构建优良啤酒酵母的研究

基因工程已广泛地应用于微生物的菌种改造与构建。本文着重介绍了利用基因工程对不同性能的啤酒酵母进行构建的研究情况，并提出了啤酒酵母工程菌的发展前景。