Molecular Fundaments of Mechanical Properties of Spider Silk

Dragline, framework and cocoon silk fibers of Araneus Ventricosus were used for this study. To investigate the microstructure mechanisms of stress-strain behavior of spider silk, firstly, amino acid compositions were analyzed and molecular conformations and crystallinity were measured with Raman spectra and X-ray diffraction respectively. The results showed that there were more amino acids with large side groups and polar ones in spider silk than those of Bombyx silk, and the amino acid distribution varied with different spider silk. The molecular structures were mainlyα-helix and β-sheet, and random coil andβ-turn existed as well. The proportions and arrangement of these conformations of dragline silk were different from framework and cocoon silk fibers. Microstructure was one of important factors of excellent mechanical properties of spider silk. Crystallinity of spider silk was very low, which implied that the roles of crystal on spider silk were not as great as other protein fibers.     

JWA, a novel microtubule－associated protein, regulates homeostasis of intracellular amino acids in PC12 cells

Our previous studies demonstrated that JWA,a novel retinoic acids responsive and cytoskeleton related gene, is associated with cell differentiation and apoptosis. In the present study, to elucidate if the JWA is a novel kind of microtubnle-associated proteins (MAPs) and functiona llylink to microtubule, we first successfully identified JWA from the physically purified MAPs complex of rat braint issues. The results of co-immunoprecipitation, gene transfection and immunofluorescence microscopy assays from HBE and NIH3T3 cells provide strong evidence for a linkage between JWA and β-tubulin. In general, JWA is stably binding to β-tubulin whenever microtubule is polymerized or not,and it may be critical to the mitosis process. In addition, by use of the antisense oligonucleotides technique, we also showed that JWA is a negative modulator on intracellular amino acids in PC12 cells. Further analysis indicated that JWA selectively regulates both taurine, an inhibitory aminoacid, and glutamate, an excitatory amino acid. In conclusion,JWA is not only structurally associated, but also a novel functional MAP.     

7种席夫碱对Zn2+的现场配位吸收光谱和99mTc现场配位法标记

通过电子吸收光谱研究了7种水杨醛氨基酸席夫碱配体与Zn^2 离子在水溶液中现场配位的浓度下限、pH下限和配合的物稳定存在时间．初步探索了在生理盐水中7种水杨醛氨基酸席夫碱的^99mTc现场标记．实验结果初步揭示出现场配位法具有标记放射性金属核素的潜力．     

关于按生产要素分配的探讨

根据生产要素在商品生产过程中的作用和特点，为适应我国现行的所有制结构，在一定范围内按生产要素所起作用的大小进行分配，以此提高生产要素的使用效率，促进生产力更快地发展。     

灰绿黄堇挥发性成分的分析研究

采用水蒸气蒸馏法提取，同时采用毛细管气相色谱质谱联用法对灰绿黄堇挥发性化学成分进行了分析研究．经毛细管色谱分离出13个峰，并且确认了所含的全部化合物．用气相色谱面积归一化法测定了各成分的相对百分含量．其主要化学成分为：3．7—二甲基—1．6—辛二烯—3—醇(46．80％)；2—氨基苯甲酸—3．7—二甲基—1，6—辛二烯—3—酯(11．90％)；4—甲基—1—(1—甲基乙基)—3—环己烯—1—醇(10．66％)；α—松油醇(8．31％)等，上述4种化合物的含量占全油的77．67％．为进—步开发利用提供了科学依据。     

A(X,M)-ojective模

作为ojective模的推广,引入了A(X,M) ojective模的概念,并给出了A(X,M) ojective模的等价刻画.     

毛大丁草不同部位挥发油成分的比较

用GC—MS技术对毛大丁草叶、茎、根挥发油的化学成分分别进行分析和鉴定，共分离出63个成分鉴定了55个。不同部位挥发油中低沸点成分的相对含量分别是21．902％，40．112％和77．622％。     

西域旌节花化学成分研究

利用反复硅胶柱层析进行分离和纯化，从文山西域旌节花乙醇提取物乙酸乙酯部分分离得到五个化合物，通过理化方法及光谱分析鉴定为：三十酸（tricontanoic acid Ⅰ)，三十酸甲酯(methyl tricontanoateⅡ)，正二十六烷(hexacosaneⅢ)．正二十九烷(nonacosaneⅣ)，正三十醇(triacontanolⅤ)。所有化合物均系首次从该种植物分到。     

网箱养殖大黄鱼血液中游离氨基酸含量的比较分析

采用柱后衍生高效液相色谱技术测定了深水网箱养殖大黄鱼、传统网箱养殖大黄鱼血液中游离氨基酸组成。结果表明：深水网箱养殖大黄鱼血液中呈味和鲜味氨基酸总量分别高出传统网箱养殖大黄鱼41.17％和85．54％，其变异系数分别为24．14％和42．37％。     

南海绿藻石莼营养成分的初步研究

研究了南海绿藻石莼的一般营养成分、蛋白质的氨基酸组成,以及一些无机元素的含量.结果表明,石莼是一种富含蛋白质、纤维素和灰分的海藻.石莼蛋白质全部必需氨基酸的含量占总氨基酸量的41.2%,表明石莼富含必需氨基酸;四种呈味氨基酸含量为41.5%,因此石莼是一种营养且味道较鲜美的海藻.石莼的蛋白质营养价根据第一限制氨基酸价(44.3)评价较低,不过第二限制氨基酸价(88.0)为较高,其他氨基酸价较均匀,缬氨酸价最高.石莼五种矿物质含量均高于其他海藻,以铁、镁含量最为明显,表明石莼矿物质含量极为丰富.