Nanostructuring by Deposition of Protein Channels Formed on Carbon Surfaces

Nano Letters ◽  
2002 ◽  
Vol 2 (11) ◽  
pp. 1263-1268 ◽  
Author(s):  
Michael Niederweis ◽  
Christian Heinz ◽  
Katharine Janik ◽  
Stefan H. Bossmann
Keyword(s):  
Carbon Surfaces ◽  
Protein Channels

scholarly journals Water and Deuterium Oxide Permeability through Aquaporin 1: MD Predictions and Experimental Verification

2007 ◽  
Vol 130 (1) ◽  
pp. 111-116 ◽  
Author(s):  
Artem B. Mamonov ◽  
Rob D. Coalson ◽  
Mark L. Zeidel ◽  
John C. Mathai
Keyword(s):  
Deuterium Oxide ◽  
Diffusion Constant ◽  
Structural Data ◽  
Md Simulations ◽  
Water Model ◽  
Aquaporin 1 ◽  
Self Diffusion ◽  
Osmotic Permeability ◽  
Protein Channels ◽  
And Diffusion

Determining the mechanisms of flux through protein channels requires a combination of structural data, permeability measurement, and molecular dynamics (MD) simulations. To further clarify the mechanism of flux through aquaporin 1 (AQP1), osmotic pf (cm3/s/pore) and diffusion pd (cm3/s/pore) permeability coefficients per pore of H2O and D2O in AQP1 were calculated using MD simulations. We then compared the simulation results with experimental measurements of the osmotic AQP1 permeabilities of H2O and D2O. In this manner we evaluated the ability of MD simulations to predict actual flux results. For the MD simulations, the force field parameters of the D2O model were reparameterized from the TIP3P water model to reproduce the experimentally observed difference in the bulk self diffusion constants of H2O vs. D2O. Two MD systems (one for each solvent) were constructed, each containing explicit palmitoyl-oleoyl-phosphatidyl-ethanolamine (POPE) phospholipid molecules, solvent, and AQP1. It was found that the calculated value of pf for D2O is ∼15% smaller than for H2O. Bovine AQP1 was reconstituted into palmitoyl-oleoyl-phosphatidylcholine (POPC) liposomes, and it was found that the measured macroscopic osmotic permeability coefficient Pf (cm/s) of D2O is ∼21% lower than for H2O. The combined computational and experimental results suggest that deuterium oxide permeability through AQP1 is similar to that of water. The slightly lower observed osmotic permeability of D2O compared to H2O in AQP1 is most likely due to the lower self diffusion constant of D2O.

Aging of Plasma-activated Carbon Surfaces: Challenges and Opportunities

2021 ◽  
pp. 150362
Author(s):  
Euth Ortiz-Ortega ◽  
Samira Hosseini ◽  
Sergio O. Martinez-Chapa ◽  
Marc J. Madou
Keyword(s):  
Activated Carbon ◽  
Challenges And Opportunities ◽  
Carbon Surfaces

scholarly journals Towards Practical Applications of EQCN Experiments to Study Pt Anchor Sites on Carbon Surfaces

2017 ◽  
Vol 9 (2) ◽  
pp. 271-278 ◽  
Author(s):  
Adrian C. Fortuin ◽  
Colleen Jackson ◽  
Emanuela Carleschi ◽  
Bryan P. Doyle ◽  
Adam Shnier ◽  
...  
Keyword(s):  
Practical Applications ◽  
Carbon Surfaces

Iron Polypyridyl Complex Adsorbed on Carbon Surfaces for Hydrogen Generation

2021 ◽  
Author(s):  
Caroline M Margonis ◽  
Marissa Ho ◽  
Benjamin D Travis ◽  
William W. Brennessel ◽  
William Robert McNamara
Keyword(s):  
Hydrogen Generation ◽  
Polypyridyl Complex ◽  
Carbon Surfaces

A series of homogeneous Fe(III) complexes were recently reported that are active for electrocatalytic hydrogen generation. Herein we report a napthalene-terminated Fe(III) complex for use in the functionalization of glassy...

Fractal model for adsorption on activated carbon surfaces: Langmuir and Freundlich adsorption

2000 ◽  
Vol 467 (1-3) ◽  
pp. 131-138 ◽  
Author(s):  
Fumiaki Kanô ◽  
Ikuo Abe ◽  
Hiroshi Kamaya ◽  
Issaku Ueda
Keyword(s):  
Activated Carbon ◽  
Fractal Model ◽  
Carbon Surfaces
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