Self-assembled structures formed by a wedge-shaped molecule in 2D and 3D: the role of flexible side chains and polar head groups

2010 ◽  
Vol 12 (7) ◽  
pp. 1444-1452 ◽  
Author(s):  
Xiaomin Zhu ◽  
Ahmed Mourran ◽  
Uwe Beginn ◽  
Martin Möller ◽  
Denis V. Anokhin ◽  
...  
Keyword(s):  
Side Chains ◽  
Polar Head ◽  
Head Groups ◽  
Self Assembled ◽  
2D And 3D

Experiments and Molecular Simulations to Study the Role of Coadsorption of Oil in Corrosion Inhibitor Films in Improving Corrosion Mitigation

CORROSION ◽  
10.5006/3606 ◽  
2020 ◽  
Vol 76 (11) ◽  
Author(s):  
Xueying Ko ◽  
Juan Dominguez Olivo ◽  
Bruce Brown ◽  
Srdjan Nešić ◽  
Sumit Sharma
Keyword(s):  
Aqueous Solution ◽  
Corrosion Inhibitor ◽  
Metal Surfaces ◽  
Laboratory Experiments ◽  
Field Experience ◽  
Molecular Simulations ◽  
Self Assembled Monolayer ◽  
Polar Head ◽  
Self Assembled

While both field experience and laboratory experiments have shown that the efficiency of adsorbed corrosion inhibitor films improves upon exposure of the aqueous solution to a hydrocarbon phase, a credible explanation of these results is lacking. Using a combination of experiments and molecular simulations, this study examines how exposure to oil molecules affects the nature of adsorbed corrosion inhibitor films on metal surfaces. It is found that oil molecules get coadsorbed in the corrosion inhibitor films, making them more hydrophobic, structurally more ordered, and well packed. Corrosion inhibitor molecules with a bulky polar head adsorb in nonplanar, cylinder-like morphologies. Coadsorption of oil molecules changes the morphology of these films to a planar self-assembled monolayer.

Polar head groups are important for barrier-protective effects of oxidized phospholipids on pulmonary endothelium

2007 ◽  
Vol 292 (4) ◽  
pp. L924-L935 ◽  
Author(s):  
Anna A. Birukova ◽  
Panfeng Fu ◽  
Santipongse Chatchavalvanich ◽  
Dylan Burdette ◽  
Olga Oskolkova ◽  
...  
Keyword(s):  
Protective Effects ◽  
Oxidized Phospholipids ◽  
Barrier Dysfunction ◽  
Polar Head ◽  
Cell Counts ◽  
Head Groups ◽  
Stimulation Of

We have previously described protective effects of oxidized 1-palmitoyl-2-arachidonoyl- sn-glycero-3-phosphocholine (OxPAPC) on pulmonary endothelial cell (EC) barrier function and demonstrated the critical role of cyclopentenone-containing modifications of arachidonoyl moiety in OxPAPC protective effects. In this study we used oxidized phosphocholine (OxPAPC), phosphoserine (OxPAPS), and glycerophosphate (OxPAPA) to investigate the role of polar head groups in EC barrier-protective responses to oxidized phospholipids (OxPLs). OxPAPC and OxPAPS induced sustained barrier enhancement in pulmonary EC, whereas OxPAPA caused a transient protective response as judged by measurements of transendothelial electrical resistance (TER). Non-OxPLs showed no effects on TER levels. All three OxPLs caused enhancement of peripheral EC actin cytoskeleton. OxPAPC and OxPAPS completely abolished LPS-induced EC hyperpermeability in vitro, whereas OxPAPA showed only a partial protective effect. In vivo, intravenous injection of OxPAPS or OxPAPC (1.5 mg/kg) markedly attenuated increases in the protein content, cell counts, and myeloperoxidase activities detected in bronchoalveolar lavage fluid upon intratracheal LPS instillation in mice, although OxPAPC showed less potency. All three OxPLs partially attenuated EC barrier dysfunction induced by IL-6 and thrombin. Their protective effects against thrombin-induced EC barrier dysfunction were linked to the attenuation of the thrombin-induced Rho pathway of EC hyperpermeability and stimulation of Rac-mediated mechanisms of EC barrier recovery. These results demonstrate for the first time the essential role of polar OxPL groups in blunting the LPS-induced EC dysfunction in vitro and in vivo and suggest the mechanism of agonist-induced hyperpermeability attenuation by OxPLs via reduction of Rho and stimulation of Rac signaling.

Membrane interactions of rat intestinal alkaline phosphatase: role of polar head groups

Biochemistry ◽  
1985 ◽  
Vol 24 (23) ◽  
pp. 6603-6608 ◽  
Author(s):  
Bellur Seetharam ◽  
Chinnaswamy Tiruppathi ◽  
David H. Alpers
Keyword(s):  
Alkaline Phosphatase ◽  
Membrane Interactions ◽  
Intestinal Alkaline Phosphatase ◽  
Polar Head ◽  
Head Groups

scholarly journals Mechanical and Charge Transport Properties of Alkanethiol Self-Assembled Monolayers on a Au(111) Surface:  The Role of Molecular Tilt

Langmuir ◽  
2008 ◽  
Vol 24 (5) ◽  
pp. 2219-2223 ◽  
Author(s):  
Yabing Qi ◽  
Imma Ratera ◽  
Jeong Y. Park ◽  
Paul D. Ashby ◽  
Su Ying Quek ◽  
...  
Keyword(s):  
Charge Transport ◽  
Transport Properties ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled
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