نتایج جستجو برای: lecithin organogels

تعداد نتایج: 3682  

2015
Courtney H. Fox Gijs M. ter Hurrne Rudy J. Wojtecki Gavin O. Jones Hans W. Horn E. W. Meijer Curtis W. Frank James L. Hedrick Jeannette M. García

Dynamic covalent materials are stable materials that possess reversible behaviour triggered by stimuli such as light, redox conditions or temperature; whereas supramolecular crosslinks depend on the equilibrium constant and relative concentrations of crosslinks as a function of temperature. The combination of these two reversible chemistries can allow access to materials with unique properties....

Journal: :Chemical communications 2004
Seung Yeul Ryu Sehoon Kim Jangwon Seo Young-Woon Kim Oh-Hoon Kwon Du-Jeon Jang Soo Young Park

Supramolecular aggregation of a novel nonfluorescent gelator yields highly luminescent organogels in aprotic organic solvents through intermolecular hydrogen bonding, which is a key motif for both self-assembly and photophysical process control.

Journal: :Clinical chemistry 1987
J S Amenta S C Brocher A L Serenko-Aber

Amniotic fluid phospholipids from 346 patients' specimens were quantified and evaluated against the clinical outcome (i.e., respiratory distress syndrome or normal respiratory function). Concentrations of lecithin, sphingomyelin, phosphatidylglycerol, and the lecithin/sphingomyelin reflectance ratio were evaluated by ordered frequency distribution and stepwise discriminant function analysis. Th...

Journal: :The Journal of Cell Biology 1969
Olga Stein Yechezkiel Stein

Injection of choline-(3)H into choline-deficient rats resulted in an enhanced incorporation of the label into liver lecithin, as compared to the incorporation of label into liver lecithin of normal rats. The results obtained with the use of different lecithin precursors indicate that in the intact liver cell, both in vivo and in vitro, exchange of choline with phosphatidyl-choline is not signif...

Journal: :Clinical chemistry 1981
L J McDonald N I Robin L Siegel

We describe a new method of complete analysis for lecithin, lysolecithin, and sphingomyelin in amniotic fluid. The analysis is based on alkaline hydrolysis of the lecithins and the enzymic hydrolysis of sphingomyelin. The choline formed in each instance is enzymically phosphorylated with [gamma-32P]ATP to yield [gamma-32P]phosphorylcholine, which is isolated by anion-exchange chromatography and...

Journal: :The Biochemical journal 1996
H Ochi S Tazuma G Kajiyama

The present study was performed to determine whether the degree of lecithin hydrophobicity regulates bile metastability and, therefore, affects the process of cholesterol crystallization. Supersaturated model bile (MB) solutions were prepared with an identical composition on a molar basis (taurocholate/lecithin/cholesterol, 73:19.5:7.5; total lipid concentration 9 g/dl) except for the lecithin ...

Journal: :International journal of molecular medicine 2009
Yuebo Zhang Cheng Huang Xiaoyan Sheng Zhenwei Gong Ying Qin Zang

Lecithin is an essential biological component and widely used as a nutritional supplement for protecting cells from oxidation, increase fat burning and preventing cardiovascular disease. Lecithin contains fatty acids identified as the peroxisome proliferator-activated receptor (PPAR) agonists. However, the role of lecithin in adipogenesis and lipogenesis remains elusive. 3T3-L1 cells and mouse ...

Journal: :The British journal of venereal diseases 1950
R P JAYEWARDENE T VELAUDAPILLAI

as the antigen for a simplified precipitation test for syphilis. Cardiolipin is the lipid which, in combination with lecithin, gives the alcoholic extract of beef heart its antigenic properties. It is a complex phosphatidic acid with a molecular weight of 2195 and iodine number 120-125. It requires lecithin and cholesterol for antigenicity. It has not yet been synthesized. The cardiolipin-lecit...

Journal: :Blood 1971
P Elsbach P Pettis A Marcus

Human platelets incubated with 32p lysolecithin convert this compound to platelet lecithin and the water-soluble product glycerylphosphorylcholine. Lecithin synthesis from lysolecithin by intact platelets has a pH optimum of 9, whereas platelet homogenates show a pH optimum of 7.5 for the same reaction. Conversion of lysolecithin to platelet lecithin takes place by direct acylation of lysolecit...

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