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排序方式: 共有102条查询结果,搜索用时 15 毫秒
21.
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. 相似文献
22.
D. Brdiczka 《Cellular and molecular life sciences : CMLS》1990,46(2):161-166
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. 相似文献
23.
针对三氯化铁在甘油水净化过程中的作用特点,用硫酸工业产生的副产品“红灰”与工业级盐酸及次氯酸钠等,经一定的化学反应,制得一种适用于甘油水净化的专用三氯化铁液,直接应用于皂化法制皂联产甘油工艺,使含甘油水净化。 相似文献
24.
杨明挚 《云南大学学报(自然科学版)》1998,20(5):374-376
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 相似文献
25.
以甘油和丙酮为原料,经缩酮反应制备丙酮缩甘油.探讨了原料比、反应时间、催化剂用量、带水剂的选择及用量对产率的影响.合适的反应条件为:原料甘油:丙酮=1:3(物质的量比),反应时间5 h,催化剂用量为甘油质量的6%,丙酮作为带水剂,用量为V(甘油):V(丙酮)=1:4.5,在最佳条件下,该步反应取得了85%左右的较高收率... 相似文献
26.
强酸性阳离子交换树脂催化合成甘油三乙酸酯的研究 总被引:1,自引:1,他引:1
王树清 《南通大学学报(自然科学版)》2005,4(1):25-27
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。 相似文献
27.
盐藻3—磷酸甘油脱氢酶基因克隆 总被引:4,自引:1,他引:4
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 相似文献
28.
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 相似文献
29.
《厦门大学学报(自然科学版)》2002,(Z1)
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... 相似文献
30.
Endocannabinoids and β-amyloid-induced neurotoxicity in vivo: effect of pharmacological elevation of endocannabinoid levels 总被引:3,自引:0,他引:3
van der Stelt M Mazzola C Esposito G Matias I Petrosino S De Filippis D Micale V Steardo L Drago F Iuvone T Di Marzo V 《Cellular and molecular life sciences : CMLS》2006,63(12):1410-1424
We investigated the involvement of endocannabinoids in the control of neuronal damage and memory retention loss in rodents
treated with the β-amyloid peptide (1–42) (BAP). Twelve days after stereotaxic injection of BAP into the rat cortex, and concomitant
with the appearance in the hippocampus of markers of neuronal damage, 2-arachidonoyl glycerol, but not anandamide, levels
were enhanced in the hippocampus. VDM-11 (5 mg/kg, i.p.), an inhibitor of endocannabinoid cellular reuptake, significantly
enhanced rat hippocampal and mouse brain endocannabinoid levels when administered sub-chronically starting either 3 or 7 days
after BAP injection and until the 12–14th day. VDM-11 concomitantly reversed hippocampal damage in rats, and loss of memory
retention in the passive avoidance test in mice, but only when administered from the 3rd day after BAP injection. We suggest
that early, as opposed to late, pharmacological enhancement of brain endocannabinoid levels might protect against β-amyloid
neurotoxicity and its consequences.
Received 26 January 2006; received after revision 24 March 2006; accepted 12 April 2006 相似文献