Effects of gastric secretagogues on tissue glycerol in the isolated amphibian gastric mucosa

Summary Histamine and theophylline, two gastric secretagogues, significantly increased tissue glycerol content by 121 and 66%, respectively, in the isolated toad gastric mucosa. This is new evidence in favor of the hypothesis that gastric segretagogues may act via lipid mobilization.This investigation was supported by Consejo de Desarrollo Científico y humanístico de la Universidad del Zulia, Maracaibo, Venezuela.     

Interaction of mitochondrial porin with cytosolic proteins

Summary Intracellular phosphorylation is an important step in active uptake and utilization of carbohydrates. For example glucose and glycerol enter the liver, cell along the extra intracellular gradient by facilitated diffusion through specific carriers and are concentrated inside the cell by phosphorylation via hexokinase or glycerol kinase. Depending on the function of the respective tissue the uptake of carbohydrates serves different metabolic purposes. In brain and kidney medulla cells which depend on carbohydrates, glucose and glycerol are taken up according to the energy demand. However, in tissues such as muscle which synthesize glycogen or like liver which additionally produce fat from glucose, the uptake of carbohydrates has to be regulated according to the availability of glucose and glycerol. How the reversible coupling of the kinases to the outer membrane pore and the mitochondrial ATP serves to fulfil these specific requirements will be explained as well as how this regulates the carbohydrate uptake in brain according to the activity of the oxidative phosphorylation and how this allows glucose uptake in liver, and muscle to persist in the presence of high glucose 6-phosphate without activating the rate of glycolysis.     

移植瘤株冷冻保护的实验研究

本文介绍了人肝癌细胞析细胞及其移植瘤组织经冻存，复苏后检测琥珀酸脱氢酶（ＳＤＥ）活性，成瘤率和电镜检查，选择１０％ＤＭＳＯ或１０％甘油作为冷冻保护剂来冻存细胞，它们先在冰箱里缓慢降温冷却（－０．８℃／ｍｉｎ），后在液氮罐口的液氮气中冷冻（－１０℃／ｍｉｎ）１天，最后置入液氮内，冷并保护后的冻存或组织复苏后显示高的ＳＤＥ活性，１０％ＤＭＳＯ冻存的细胞ＳＤＥ活性比１０％甘油者高，两者相比有显著差别（Ｐ     

南瓜甘油—3—磷酸转酰酶基因cDNA的克隆及限制性图谱分析

依据国外有关文献,采用ＲＴ－ＰＣＲ技术成功地从南瓜子叶中分离了甘油－３－磷酸酰基转移酶（ＧＰＡＴ）基因的ｃＤＮＡ片段并克隆到了ｐＧＥＭ－Ｔ载体系统的多克隆位点上．限制性内切酶分析表明确属该基因．ＧＰＡＴ对植物的抗冷性有着重要的作用,该基因的克隆为进一步研究该酶和该基因及其与植物抗冷性关系迈出了第一步     

ACC氧化酶的测定方法

利用番木瓜ＣａｒｉｃａＰａｐａｙａＬ．果实为材料，研究了１－氨基环丙烷－１－羧酸（ＡＣＣ）氧化酶的体内和体外测定方法．在ＡＣＣ氧化酶的体外分析中，甘油体积分数为１０％～３０％时能稳定酶的活性；φ（ＣＯ２）为０．３％～２０％（反应体系气相中）和０．５～１２ｍｍｏｌ／ＬＡＣＣ提高酶的活性；较适宜的ｐＨ值为７．２．     

盐藻3—磷酸甘油脱氢酶基因克隆

采用Ｌａｍｂｄａ置换型载体ＥＭＢＬ３构建了盐藻基因组文库，文库大小为１．８×１０４，插入片段大小为１０～２０ｋｂ，从盐藻基因组文库中获得３个３－磷酸甘油脱氢酶基因的阳性克隆，斑点杂交证实了原位杂交的真实性     

邻苯二甲酰亚胺乙氧基环甘油硫代磷脂缀合物的合成

以碘活化的六乙基亚磷酰三胺为磷酰化及环化试剂 ,经“一锅法”合成了邻苯二甲酰亚胺乙氧基环甘油硫代磷脂缀合物 ,收率达 90 %左右     

An Application of Real-time Error Compensation to a NC Twin-spindle Lathe

The processes of adsorption and oxidation of glycerol on Pt, Pt/Sbad and Pt/Sad electrodes were studied by using Cyclic voltammetry and electrochemical quartz crystal microbalance (EQCM). The results demonstrated that the oxidation of glycerol depended strongly on oxidation states of electrode surface. Sb adatoms on Pt surface can adsorb oxygen at relatively low potentials, and exhibit catalytic effects for glycerol oxidation. In contrast to Pt electrodes, the oxidation peak potential of glycerol on Pt surf...     

粒细胞集落刺激因子对甘油诱导小鼠急性肾功能衰竭的保护作用

目的:探讨粒细胞集落刺激因子(G-CSF)对甘油诱导的小鼠急性肾功能衰竭的保护作用。方法:将φ=50%的甘油注射于停止饮水18h的C57BL/6j小鼠后肢肌肉内(11 6mL/kg),诱导小鼠产生急性肾功能衰竭;于注射甘油3h后,实验组小鼠每天腹腔注射G-CSF10μg/kg,连续注射5d,对照组用等量的生理盐水进行注射,正常组不作任何处理;在注射甘油72h和168h后,分别检测小鼠血清的肌酐和尿素氮含量,观察小鼠肾脏组织的病理变化。结果:在注射甘油后第72h,实验组血清的肌酐和尿素氮分别为(37 2±2 17)μmol/L和(15 6±1 60)mmol/L,显著低于对照组(P<0 01),略高于正常组(P>0 05);肾组织切片,HE染色,显微镜检查发现肾近曲小管上皮细胞变性坏死病灶呈散在分布(++),明显较对照组(++++)轻。在第168h,实验组血清的肌酐和尿素氮分别为(32 3±3 46)μmol/L和(10 90±1 24)mmol/L,接近于正常(32 2±2 09)μmol/L和(12 25±1 11)mmol/L;肾组织切片,HE染色,显微镜检查发现肾组织病理改变(+)也接近正常。结论:G-CSF对甘油诱导的小鼠急性肾功能衰竭有保护作用。     

强酸性阳离子交换树脂催化合成甘油三乙酸酯的研究

以乙酸、甘油为原料,直接酯化合成甘油三乙酸酯,研究了反应温度、反应时间、原料配比、带水剂、催化剂用量等条件对合成反应的影响,确定了最佳工艺条件。该方法合成甘油三乙酸酯的最佳工艺条件是：反应温度92～98℃;反应时间5h;n(乙酸)：n(甘油)为4．5：1．0;催化剂用量为总物料质量的0．9％;带水剂苯用量为15mL(甘油为0．15mol的情况下)。甘油三乙酸酯的收率达到92．30％。催化剂不经处理可循环使用多次。该催化剂具有价廉易得、催化活性好、不腐蚀设备、无环境污染等优点。