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512 results on '"Noy, Aleksandr"'

101. Structure and function of natural proteins for water transport: general discussion

Author

Baaden, Marc, primary, Barboiu, Mihail, additional, Bill, Roslyn M., additional, Casanova, Serena, additional, Chen, Chun-Long, additional, Conner, Matthew, additional, Freger, Viatcheslav, additional, Gong, Bing, additional, Góra, Artur, additional, Hinds, Bruce, additional, Horner, Andreas, additional, Hummer, Gerhard, additional, Kumar, Manish, additional, Lokesh, Mahesh, additional, Mitra, Sushanta, additional, Noy, Aleksandr, additional, Pohl, Peter, additional, Sadet, Aude, additional, Sansom, Mark, additional, Törnroth-Horsefield, Susanna, additional, and Vashisth, Harish, additional

Published
2018
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102. Applications to water transport systems: general discussion

Author

Baaden, Marc, primary, Barboiu, Mihail, additional, Borthakur, Manash Pratim, additional, Chen, Chun-Long, additional, Coalson, Rob, additional, Davis, Jeffery, additional, Freger, Viatcheslav, additional, Gong, Bing, additional, Hélix-Nielsen, Claus, additional, Hickey, Robert, additional, Hinds, Bruce, additional, Hirunpinyopas, Wisit, additional, Horner, Andreas, additional, Hou, Jun-Li, additional, Hummer, Gerhard, additional, Iamprasertkun, Pawin, additional, Kazushi, Kinbara, additional, Kumar, Manish, additional, Legrand, Yves-Marie, additional, Lokesh, Mahesh, additional, Mi, Baoxia, additional, Mitra, Sushanta, additional, Murail, Samuel, additional, Noy, Aleksandr, additional, Nunes, Suzana, additional, Pohl, Peter, additional, Song, Qilei, additional, Song, Woochul, additional, Tornroth-Horsefield, Susanna, additional, and Vashisth, Harish, additional

Published
2018
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104. Tuning crystallization pathways through sequence engineering of biomimetic polymers

Author

Ma, Xiang, primary, Zhang, Shuai, additional, Jiao, Fang, additional, Newcomb, Christina J., additional, Zhang, Yuliang, additional, Prakash, Arushi, additional, Liao, Zhihao, additional, Baer, Marcel D., additional, Mundy, Christopher J., additional, Pfaendtner, James, additional, Noy, Aleksandr, additional, Chen, Chun-Long, additional, and De Yoreo, James J., additional

Published
2017
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110. Electronic control of H+ current in a bioprotonic device with carbon nanotube porins.

Author

Hemmatian, Zahra, Tunuguntla, Ramya H., Noy, Aleksandr, and Rolandi, Marco

Subjects
HYDROGEN ions, CARBON nanotubes, BIOELECTRONICS, ELECTRONS, CHARGE carriers
Abstract

Hybrid biotic abiotic devices can be used to interface electronics with biological systems for novel therapies or to increase device functionality beyond silicon. Many strategies exist to merge the electronic and biological worlds, one dominated by electrons and holes as charge carriers, the other by ions. In the biological world, lipid bilayers and ion channels are essential to compartmentalize the cell machinery and regulate ionic fluxes across the cell membrane. Here, we demonstrate a bioelectronic device in which a lipid bilayer supported on H+-conducting Pd/PdHx contacts contains carbon nanotubes porin (CNTP) channels. This bioelectronic device uses CNTPs to control of H+ flow across the lipid bilayer with a voltage applied to the Pd/PdHx contacts. Potential applications of these devices include local pH sensing and control. [ABSTRACT FROM AUTHOR]

Published
2019
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125. Persistence length control of the polyelectrolyte layer-by-layer self-assembly on carbon nanotubes

Author

Shih-Chieh J. Huang, Artyukhin, Alexander B., Yinmin Wang, Jiann-Wen Ju, Stroeve, Pieter, and Noy, Aleksandr

Subjects
Polyelectrolytes -- Chemical properties, Polymers -- Chemical properties, Nanotubes -- Chemical properties, Chemistry
Abstract

The role of the polymer persistence length in the layer-by-layer self-assembly process on carbon nanotubes by observing formation of multilayer polyelectrolyte shells around carbon nanotubes at different ionic strength is examined. Results reveal that polymer conformation, the ability of the polymer chain to bend in order to accommodate the support curvature, is one of the critical parameters controlling layer-by-layer electrostatic self-assembly on one-dimensional templates.

Published
2005

126. Nanofluidics in carbon nanotubes

Author

Noy, Aleksandr, Park, Hyung Gyu, Fornasiero, Francesco, Holt, Jason K., Grigoropoulos, Costas P., and Bakajin, Olgica

Abstract

Extremely high aspect ratios, molecularly smooth hydrophobic graphitic walls, and nanoscale inner diameters of carbon nanotubes give rise to the unique phenomenon of ultra-efficient transport of water and gas through these ultra-narrow molecular pipes. Water and gas molecules move through nanotube pores orders of magnitude faster than through other pores of comparable size. The proposed water transport mechanism has a distinct similarity to the transport mechanisms of biological ion channels. Molecular dynamics simulations and experimental measurements of water transport underscore the importance of nanotube structure in enabling ultra-efficient transport through the pore.

Published
2007

127. Real-time dynamics of carbon nanotube porins in supported lipid membranes visualized by high-speed atomic force microscopy.

Author

Yuliang Zhang, Tunuguntla, Ramya H., Pyung-On Choi, and Noy, Aleksandr

Subjects
BILAYER lipid membranes, CELL membranes, MEMBRANE proteins, PHOSPHORYLATION, PROTEINS
Abstract

In-plane mobility of proteins in lipid membranes is one of the fundamental mechanisms supporting biological functionality. Here we use high-speed atomic force microscopy (HS-AFM) to show that a novel type of biomimetic channel--carbon nanotube porins (CNTPs)--is also laterally mobile in supported lipid membranes, mimicking biological protein behaviour. HS-AFM can capture real-time dynamics of CNTP motion in the supported lipid bilayer membrane, build long-term trajectories of the CNTP motion and determine the diffusion coefficients associated with this motion. Our analysis shows that diffusion coefficients of CNTPs fall into the same range as those of proteins in supported lipid membranes. CNTPs in HS-AFM experiments often exhibit 'directed' diffusion behaviour, which is common for proteins in live cell membranes. [ABSTRACT FROM AUTHOR]

Published
2017
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133. Lipid bilayer composition can influence the orientation of proteorhodopsin in artificial membranes.

Author

Tunuguntla, Ramya, Tunuguntla, Ramya, Bangar, Mangesh, Kim, Kyunghoon, Stroeve, Pieter, Ajo-Franklin, Caroline M, Noy, Aleksandr, Tunuguntla, Ramya, Tunuguntla, Ramya, Bangar, Mangesh, Kim, Kyunghoon, Stroeve, Pieter, Ajo-Franklin, Caroline M, and Noy, Aleksandr

Abstract

Artificial membrane systems allow researchers to study the structure and function of membrane proteins in a matrix that approximates their natural environment and to integrate these proteins in ex vivo devices such as electronic biosensors, thin-film protein arrays, or biofuel cells. Given that most membrane proteins have vectorial functions, both functional studies and applications require effective control over protein orientation within a lipid bilayer. In this work, we explored the role of the bilayer surface charge in determining transmembrane protein orientation and functionality during formation of proteoliposomes. We reconstituted a model vectorial ion pump, proteorhodopsin, in liposomes of opposite charges and varying charge densities and determined the resultant protein orientation. Antibody-binding assay and proteolysis of proteoliposomes showed physical evidence of preferential orientation, and functional assays verified the vectorial nature of ion transport in this system. Our results indicate that the manipulation of lipid composition can indeed control orientation of an asymmetrically charged membrane protein, proteorhodopsin, in liposomes.

Published
2013

149. pH-Tunable Ion Selectivity in Carbon Nanotube Pores

Author

Fornasiero, Francesco, primary, In, Jung Bin, additional, Kim, Sangil, additional, Park, Hyung Gyu, additional, Wang, Yinmin, additional, Grigoropoulos, Costas P., additional, Noy, Aleksandr, additional, and Bakajin, Olgica, additional

Published
2010
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