贵州煤萃取物的族组成与萃取动力学特征探讨

用二氯甲烷对贵州月亮田和凯里两种煤样进行了索氏萃取。并采用柱色谱对萃取物进行了族组分分离，利用气相色谱／质谱联用技术（GC／MS）分析研究了萃取物的族组成，并对萃取动力学特征进行了探讨．实验结果表明：萃取过程阶段性明显；萃取物脂肪烃馏分主要为正构烷烃和烷基环己烷，芳烃馏分包括常规芳烃及它们的烷基衍生物和杂环化合物，非烃馏分检测出含氧、氮、硫和溴等多种极性化合物结构；在月亮田煤样中，低分子化合物多以游离态和吸附态形式存在，而在凯里煤样中。低分子化合物多以共溶态形式存在．图5，表6，参9。     

质谱技术的新进展及其在生命科学中的应用

文章综述了质谱技术的新进展与CZE/MS/MS,MALDI-TOF-MS,LC-ESI-MS等质谱新技术及它们在生命科学中的应用.指出这些质谱新技术已被证明在多肽和蛋白质的鉴定、单核苷酸、核酸、糖蛋白的分析等领域是很有效的工具.     

沉积物中有机成分的分析方法研究

利用GC-MS对污染严重的官厅水库沉积物中的有机成分进行了初步的定 性分析和归类,并探讨了有机污染物的来源.对不同的提取方法、提取时间的探索,得到了样 品提取的最佳条件.优化了固相萃取的条件,并在此条件下用固相萃取对土壤样品中的多环 芳烃类、有机酸类化合物进行了富集和纯化,GC-MS分析检出了80种多环芳烃、29种一元酸和6种二元酸.     

钾盐在烟草燃烧过程中的作用

采用等体积浸渍法分别在烟草中加入硝酸钾KNO3、柠檬酸钾K3C6H5O7、草酸钾K2C2O4及酒石酸钾K2C4H4O6，并用差热分析（differential thermal analysis,DTA)、程序升温反应在线质谱分析（temperature-programmed reaction mass spectrometry on-line analysis,TPR-MS)方法对烟草进行了表征，用气相色谱法考察了主流烟气中CO含量的变化。结果表明，加入钾盐后，CO含量都有不同程度的降低。在钾盐含量为0．2475mmol/g的上述四种烟草样品上，烟气中CO含量按空白烟草T＞KNO3／T＞K2C2O4／T＞K3C6H5O7／T＞K2C4H4O6／T顺序排列。DTA给出的低温峰减弱、高温峰增强的结果表明，K^ 的加入改变了烟草燃烧过程中物质的转化历程，从而降低了卷烟的燃烧温度。通过对TPR－MS和DTA结果的联合分析，得出由于钾与烟草中的有机组分作用，含不同钾盐的烟草燃烧时产生了类似的含钾中间物质。证实了K^ 对烟草燃烧的作用机理，说明了钾盐降低烟草燃烧温度的原因。最后，还分析了主流烟气中CO含量的变化与DTA结果间的联系。     

HPLC结合APIMS/MS法研究屏边三七的皂甙成分

应用HPLC与API－MS／MS相结合，分析了屏边三七95％乙醇提取物的三萜皂甙成分，结果表明，屏边三节除含有屏边三七皂甙R1,R2，还含有少量人参皂甙Rb,Rc,Rb3和Rd。     

氢化松香中性部分的化学组成

利用改进的DEAE Sephadex离子交换色谱从自制氢化松香中分离出中性部分 ,并采用DB 5毛细管柱和GC MS DS技术对中性部分的化学组成进行分析。结果氢化松香中性部分共分离出 1 8个组分 ,鉴定了其中的 1 3个组分 ,主要成分为 7 二氢异海松醇、8( 1 4) 二氢海松醇、油酸甲酯、1 5 二十四碳烯酸甲酯、3,1 7 二羟基 孕甾烷 1 1 ,2 0 二酮、7 二氢异海松醛及去氢枞酸甲酯等。其中的 7个氢化二萜组分为首次报道的新化合物。     

西藏高原盐湖植物—杜氏藻的香气成分研究

扎布盐湖世界上已知的海拔最高的丰富的嗜盐菌藻产地。本文用吸附法收集扎布耶湖中杜氏藻的香气，经色质用定性鉴定了３８个香气成分，其中大部分是藻类植物未被检检出的化合物。     

Fuzzy数空间上MS收敛与水平收敛的关系

证明了当u∈E^c，∈E，n=1，2，…时，un^MS→等价于unl→u，并指出条件。∈Ec不能减少．     

A proteomic analysis of bacterial strain<Emphasis Type="Italic">Sinorhizobium fredii</Emphasis> RT19 subjected to salt shock

Sinorhizobium fredii RT19, a strain of freeliving bacteria, was subjected to salt shock and its protein expression profiles were analyzed by differential display proteome approaches. The results of separation by two-dimensional polyacrylamide gel electrophoresis (2D PAGE) showed that the number of resolved proteins was 481, 465 and 424, corresponding to salt-free control, 5 and 50 min 1 mol/L salt treatment, respectively. Among the resolved proteins, 82 in total had altered expression in response to salt-shock stress. 26 out of the 82 proteins were induced and 23 were completely inhibited, while 12 were up-regulated and 21 down-regulated in response to salt shock. In addition, the appearance of differentially displayed proteins responding to different salt shock periods is also reported. The identity of the 26 induced proteins was revealed by matrix assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF/MS) followed by database searching. Among them, 20 were assigned to proteins with known functions. Their roles in response to salt shock stress are discussed.     

Increased demyelination and axonal damage in metallothionein I+II-deficient mice during experimental autoimmune encephalomyelitis

Metallothioneins I+II (MT-I+II) are antioxidant, neuroprotective factors. We previously showed that MT-I+II deficiency during experimental autoimmune encephalomyelitis (EAE) leads to increased disease incidence and clinical symptoms. Moreover, the inflammatory response of macrophages and T cells, oxidative stress, and apoptotic cell death during EAE were increased by MT-I+II deficiency. We now show for the first time that demyelination and axonal damage are significantly increased in MT-I+II deficient mice during EAE. Furthermore, oligodendroglial regeneration, growth cone formation, and tissue repair including expression of trophic factors were significantly reduced in MT-I+II-deficient mice during EAE. Accordingly, MT-I+II have protective and regenerative roles in the brain. Received 31 October 2002; received after revision 23 November 2002; accepted 26 November 2002 RID="*" ID="*"Corresponding author. M. Penkowa and C. Espejo contributed equally to this paper.