食品中草酸的气相色谱分析

本文报导一种分析食品中草酸含量的方法。该方法是将固体食品样经过用水提取,用7％HCl—CH_3OH甲酯化之后,以气相色谱法测定草酸二甲酯的含量。该方法简单,准确,且样品用量少。     

介孔材料-酸性红12染料分子体系动力学模型的建立和模拟

以酸性红12作为多苯环长链发色有机物的代表,通过对有效扩散系数的测定,确定其在介孔材料颗粒体上的吸附等温式和平衡接近率随时间变化的关系.利用非稳态扩散传质与非稳态热传导过程类比速率方程相似的特点,应用Peterson的热传导近似公式,用计算机求解超越方程,得到了酸性红12在介孔复合材料颗粒内的有效扩散系数并进行了拟合验证,得出该传质过程的主要作用力类型.     

Functions of fatty acid binding proteins

Summary Cytosolic fatty acid binding proteins (FABP) belong to a gene family of which eight members have been conclusively identified. These 14–15 kDa proteins are abundantly expressed in a highly tissue-specific manner. Although the functions of the cytosolic FABP are not clearly established, they appear to enhance the transfer of long-chain fatty acids between artificial and native lipid membranes, and also to have a stimulatory effect on a number of enzymes of fatty acid metabolism in vitro. These findings, as well as the tissue expression, ligand binding properties, ontogeny and regulation of these proteins provide a considerable body of indirect evidence supporting a broad role for the FABP in the intracellular transport and metabolism of long-chain fatty acids. The available data also support the existence of structure- and tissue-specific specialization of function among different members of the FABP gene family. Moreover, FABP may also have a possible role in the modulation of cell growth and proliferation, possibly by virtue of their affinity for ligands such as prostaglandins, leukotrienes and fatty acids, which are known to influence cell growth activity. FABP structurally unrelated to the cytosolic gene family have also been identified in the plasma membranes of several tissues (FABP_pm). These proteins have not been fully characterized to date, but strong evidence suggests that they function in the transport of long-chain fatty acids across the plasma membrane.     

以丙烯酸-β-羟乙酯与丙烯酸为原料制备二丙烯酸乙二醇酯

以丙烯酸（AA）与丙烯酸-β-羟基乙酯（HEA）为原料，经酯化反应合成出了二丙烯酸乙二醇酯（EGDA）。以EGDA得率为考核指标，对催化剂种类及用量、阻聚剂种类及用量等合成条件进行了实验研究与优化，发现对于该反应，环己烷是比苯更优的带水剂，反应宜采用减压降温的方法抑制聚合的发生。对比分析表明，采用该方法制备EGDA的得率比直接酯化法、酯交换法更高，且产品的品质更好。     

氨基酸螯合铁的研究及应用现状

对氨基酸螯合铁的吸收机制、吸收作用的特点、化学和生物化学制备方法及其在饲料、食品中的应用现状进行了综述,提出了目前氨基酸螯合铁研究及应用中存在的主要问题和今后发展的方向.     

焊接结构及其维修的可靠性分析

本文以马尔科夫链理论研究了焊缝中裂纹的随机扩展过程,并在此基础上分析了焊缝的补焊问题,同时提出了“当量运行次数”的概念.对于工程中可能进行多次维修的结构,文中给出了损伤的稳态分布。最后用优化理论分析了最大经济效益意义上的维修方案。     

我国城市生活垃圾资源化的有效途径

城市生活垃圾是我国城市化过程中的一大难题。寻求城市生活垃圾资源化的有效途径对于正确处理环境与发展之间的矛盾，实施可持续发展战略具有重要意义。本文比较了国内外处理城市生活垃圾常用的分选法、填埋法、焚烧法的优缺点，提出了符合我国国情的城市生活垃圾资源化的产业链模式     

烷烃异构体的推导——异构体数目的计算法(补篇)

本文由代数学中的组合法及对称性的考虑,导出了计算烷基组在母体碳链上排布时可产生的不同花样数的算式,从而可求算烷烃的构造异构体数目.对C_(11)H_(24)、C_(12)H_(26)和C_(13)H_(28)计算的结果,与文献报导相符,并经画出全部结构式一一核对过.本文的方法可直接和在纸上推导异构体及系统命名相关联.