Richards模型在蔬菜生长预测中的应用

本文从 Richards模型的数学表达出发 ,阐述了模型中各参数初始值的确定以及优化过程 .并利用菜花和菠菜的试验数据建立其“最优”生长模型 .     

毛细管凝胶电泳的激光光热在线检测

近年来,毛细管电泳已成为一种高效快速的微化学分离分析新技术,在无机、有机及生物化学分析中得到了广泛的应用.但毛细管的内径小,进样量在pg～ng级,给样品的检测带来新的困难.因此,发展高灵敏度的显微在线检测器,已成为毛细管电泳技术发展中的重要环节.基于各种原理的检测器研究已有报道~[1].Dovichi等曾用热透镜技术在线检测了乙腈/     

三七水溶性化学成分及其药理研究新进展

综述了近年来三七水溶性化学成分及其药理作用特别是对神经生理活性研究的进展，对三七与人参展其它植物植物进行了比较，阐明了三七所含多肽哆肽成分研究的意义及可行性。     

Observation of topical catalysis by sphingomyelinase coupled to microspheres

Sphingomyelinase, SMase (EC 3.1.4.12), was coupled onto amino-derivatized acrylate microspheres and was shown to retain its catalytic activity. The immobilized enzyme allows one to carry out topical enzymatic reaction in a controlled manner. Accordingly, these spheres were held with a micropipet and using micromanipulator brought into contact with a giant liposome membrane composed of phosphatidylcholine and sphingomyelin (SOPC/C16:0-SM, 0.75:0.25, molar ratio), representing the substrate for the immobilized enzyme. The macroscopic consequences of the enzyme reaction were visualized using fluorescence microscopy as well as differential interference contrast microscopy. The surface contact of the giant vesicle and immobilized enzyme causes membrane microdomain formation and domain clustering (capping) in the membrane and subsequent shedding of small vesicles from the membrane into the interior of the giant liposome. The method described represents a novel approach to study enzymatic reactions and allows manipulating giant vesicles as well as cultured cells in a spatially controlled manner.     

Carbon nanotube assisted synthesis of CeO2 nanotubes

CeO₂ nanotubes have been synthesized facilely using carbon nanotubes (CNTs) as templates by a liquid phase deposition method. The properties of the CeO₂ nanotubes were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectrum (XPS) as well as thermogravimetry and differential thermal analysis (TG-DTA). The obtained CeO₂ nanotubes with a polycrystalline face-centered cubic phase have a uniform diameter ranging from 40 to 50 nm. The CeO₂ nanotubes are composed of many tiny interconnected nanocrystallites of about 10 nm in size. The pretreatment of CNTs and calcination temperature were confirmed to be the crucial factors determining the formation of CeO₂ nanotubes. A possible formation mechanism has been suggested to explain the formation of CeO₂ nanotubes.     

黄原胶以三价铬交联的水凝胶的脱水行为

对黄原胶／三价铬水凝胶在７０，８０和９０℃下的脱水行为进行了研究．脱水与凝胶的交联密度即参与交联反应的三价铬的含量有密切联系．突发脱水之后的过程可以用一级反应动力学描述，反应速度常数随三价铬的浓度和温度的增高而增大，活化能为３４．５ｋｃａｌ／ｍｏｌ．一价盐（ＮａＣｌ）的含量对脱水过程没有影响．     

有机溶剂性质及其水含量对酶催化合成含D－氨基酸残基的二肽衍生物的影响

有机溶剂性质及其水含量对酶催化合成保护的寡肽及其衍生物有显著影响。系 统地研究了有机溶剂性质及在不同有机溶剂中水含量对α－胰凝乳蛋白酶催化合成 含D－氨基酸残基的二肽衍生物产率的影响。用α－胰凝乳蛋白酶、枯草杆菌蛋白 酶和嗜热杆菌蛋白酶在有机溶剂中催化合成了一系列保护的二肽及其衍生物，并研 究了水含量对反应产率的影响，得到了十分有意义的结果。     

气固吸附等温线的研究进展

综述了近些年来在气固吸附理论研究领域对吸附等温线的研究进展。论述了从早期的BDDT的5种类型吸附等温线，到IUPAC的6种类型吸附等温线，再到基于Ono-kondo晶格模型的Gibbs吸附分类的5种类型吸附等温线．讨论了与各种类型吸附等温线类型相对应的吸附机理，并对滞留回环现象进行了解释和分析。     

富烯碳原子簇的石墨层间闭合形成机理

本文提出了富烯碳原子簇的石墨层间闭合形成机理，由该机理推出的许多结果与实验事实符合很好。我们认为碳原子簇自由基的快速淬灭及其淬灭速度是富烯碳原子簇形成及其丰度的决定因素。由此得出富烯碳原子簇在给定实验条件下产生的必然性，并预言不同大小的富烯碳原子簇可以通过优化实验条件选择性地合成。     

高效液相色谱-质谱法测定水产品中孔雀石绿及其代谢物

在水产养殖过程中,人们经常使用各种药物进行水体消毒和防止鱼病害,孔雀石绿就是其中的一种染料类杀菌剂,近年来发现它特别是其代谢物在水产体内有明显的残留现象,且代谢物的残留时间较长,由于孔雀石绿化学官能团三苯甲烷是一种致癌物质,所以欧盟、美国等宣布禁止其在经济鱼类(观赏鱼除外)养殖过程中使用。经文献检索,国内虽有水产品中孔雀石绿残留量检验方法的报道,但未涉及代谢物残留量检测方法的报道。国外已建立的检测方法主要采用了气相色谱质谱联用法测定孔雀石绿代谢物、高效液相-色谱法同时测定孔雀石绿及其代谢物和高效液相色谱-质谱法同时测定孔雀石绿及其代谢物。我们利用HPLC-VIS和Q-TOFMS技术分别建立了高效液相色谱法(初筛法)和高效液相串联质谱法(确证法)两种检测方法。