同多钼酸修饰电极的制备及电催化性能

通过高电位过氧化活化玻碳电极的方法制得了同多钼酸修饰电极，结果表明该修饰电极保持了同多钼酸的电化学活性，并且有良好的稳定性。所制得的修饰电极对酸性水溶液中的地过氧化氢，氯酸钾，亚硝酸钾具有良好的电化学催化活性，催化过程的ＥＣ平行催化机理。     

相转移催化法合成ACC

ACC(1—氨基环丙烷—1—羧酸)是一种新型植物生长调节剂。本文报导的是通过相转移催化法以氰乙酸乙酯为原料合成ACC的方法。该法具有反应步骤少、时间短、产率高的特点,是适用于生产的合成路线。     

磷脂的生物功能和分析方法

磷脂是所有生物膜的基本结构物质和功能物质。磷脂对膜蛋白的构象和细胞膜的流动性起着重要作用,影响着膜蛋白功能的正常发挥。分析了解生物膜的磷脂组成对研究生物膜的结构与功能是十分必要的。本文介绍了磷脂的各种分析方法,主要是薄层色谱、柱色谱、高效液相色谱和气相色谱法。     

Insulin-like effect of dichloroacetic acid on hexose transport in Swiss 3T3 cells

Summary Hexose transport in Swiss 3T3 cells was increased by treatment with dichloroacetic acid as well as by treatment with insulin. Neither extra-nor intracellular Ca²⁺ was found to be involved in their stimulatory action. On the other hand, the removal of intracellular Mg²⁺ resulted in a loss of the stimulation. These results suggest that dichloroacetic acid stimulates the hexose transport in Mg²⁺-dependent manner, similar to that of insulin.This work was supported in part by Grants-in-Aid for Scientific Research from the Ministry of Education, Science and Culture, and the Ministry of Health and Welfare of Japan.     

广东省大学生营养状况调查研究

本文通过称量法结合个案核算,对七问高等院校435名大学生四天的膳食进行调查,结果平均每天供热量为2,366千卡,耗热量为2,077千卡,但个案核算结果供热量低于2,900卡的占91.4％,有20％大学生的供热量低于耗热量。热量来源有70％来自糖类,10.77％来自蛋白质,其中69.65％是植物蛋白,19.15来自脂肪。膳食组成不够合理,有改善的必要。维生素摄入量普遍不足,抗坏血酸负荷试验,四小时尿中排出量低于3mg者占31.45％,与对照试验比较,P<0.01。     

Light and temperature affect retinyl ester hydrolase activity and visual pigment composition

Summary Dim light, in combination with high water temperature, resulted in a significant increase in the retinyl ester hydrolase activity in the goldfish retina. This rise in enzyme activity may relate to a selective increase in the availability of retinal chromophores thereby favoring the formation of rhodopsin under these light and temperature conditions.     

The phorbol ester TPA induces metamorphosis in Red Sea coral planulae (Cnidaria: Anthozoa)

Controlled experiments on the metamorphosis of marine invertebrate larvae require artificial inducers. These inducers can be used for studying the involvement of known signal transduction pathways in settlement and metamorphosis. The ability of the tumor-promoting phorbol ester TPA (12-O-tetradecanoylphorbol-13-acetate) to induce metamorphosis in planulae of the Red Sea soft coral speciesHeteroxenia fuscescens, Xenia umbellata, Dendronephthya hemprichii, Litophyton arboreum andParerythropodium fulvum fulvum, and the stony coralStylophora pistillata, was examined by using various concentrations of TPA. The chemical induced metamorphosis in all six species. The effect was unspecific and concentration-related. For all the corals except forX. umbellata the highest mean percentages of metamorphosis were obtained with 8.1×10^–7–10^–9 M TPA. ForX. umbellata, the percentage of metamorphosis was lower, and was obtained within a wider TPA concentration range. The present results, along with previous studies on Hydrozoa and Scyphozoa, demonstrate that TPA is the first common artificial inducer for these classes of Cnidaria. TPA is known to activate the enzyme protein kinase C (PKC) and therefore plays an important role in studying the phosphatidylinositol signal transduction system. Evidence for the involvement of this pathway in triggering metamorphosis has already been reported for Hydrozoa and Scyphozoa. Our results suggest that PKC is also involved in initiating metamorphosis in Anthozoa.     

α-酮戊二酸和丙酮酸的分光光度法同时测定

本文探讨了用分光光度法同时测定α-酮戊二酸和丙酮酸的条件。在0.3mol/L氢氧化钠介质中,这两种与2,4-二硝基苯肼所生成的腙的最大吸收波长不同,分别为390与450nm。且两个(日宗)溶液的吸光度线性加和性较好,因此可解联立方程组同时测定这两种酮酸的浓度,并将取370,390,420,450,480,510和540nm七个波长测吸光度值组成的超定方程组,以Householder法用计算机求解,所得的结果与之比较。由t检验说明两种结果在统计上无显著差异,表明选取390与450nm两个波长已经够用。由于用Reitman-Frankel法测谷丙转氨酶时作为底物的α-酮戊二酸对丙酮酸的显色有干扰,造成方法的重现性差、线性范围窄等问题。本文的工作有可能用于谷丙转氨酶的测定。     

也谈腐殖酸与“黑漆古”镜表面呈色的关系

有学者认为，战国汉唐青铜镜表面并未镀锡，其“黑漆古”表层是高锡青铜基体在腐殖酸作用下自然形成的。该文依据有关试验和文献资料，提出了一些不同的看法：（１）现有腐殖酸处理试样从颜色、光泽到表面成分和表层结构，与古镜“黑漆古”都是不同的；（２）“腐殖酸富集说”解释不了“水银沁”镜、“花背”镜等的表面现象，以及一般铜镜的加工工艺；（３）它没有一条文献记载可以为据。笔者依旧认为：“黑漆古”是古镜镀锡表层自然腐蚀的结果，这是既有实物资料，也有文献记载为凭的。     

N－乙烯基咋唑－丙烯酸共聚物的分析应用Ⅰ．荧光熄灭法测定微量铜

研究了Ｃｕ（Ⅱ）－Ｎ－乙烯基咪唑－丙烯酸－表面活性剂体系的荧光特性，确定了荧光熄灭法测定钥的最佳实验条件，采用巯基棉分离测定了环境标准水样的徽量铜，结果符合要求．