Friday, November 19, 2010

ISI Web of Knowledge Alert - Hummer, G

ISI Web of Knowledge Citation Alert

Cited Article: Hummer, G. Water conduction through the hydrophobic channel of a carbon nanotube
Alert Expires: 22 AUG 2011
Number of Citing Articles: 1 new records this week (1 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Approximation of super-ions for single-file diffusion of multiple ions through narrow pores

Authors:
Kharkyanen, VN; Yesylevskyy, SO; Berezetskaya, NM

Author Full Names:
Kharkyanen, Valery N.; Yesylevskyy, Semen O.; Berezetskaya, Natalia M.

Source:
PHYSICAL REVIEW E 82 (5): Art. No. 051103 Part 1 NOV 3 2010

Language:
English

Document Type:
Article

KeyWords Plus:
MOLECULAR-DYNAMICS; POTASSIUM CHANNEL; BROWNIAN DYNAMICS; K+ CHANNEL; CONDUCTION; MODELS; SELECTIVITY; PERMEATION; CONTINUUM; WATER

Abstract:
The general theory of the single-file multiparticle diffusion in the narrow pores could be greatly simplified in the case of inverted bell-like shape of the single-particle energy profile, which is often observed in biological ion channels. There is a narrow and deep groove in the energy landscape of multiple interacting ions in such profiles, which corresponds to the pre-defined optimal conduction pathway in the configurational space. If such groove exists, the motion of multiple ions can be reduced to the motion of single quasiparticle, called the superion, which moves in one-dimensional effective potential. The concept of the superions dramatically reduces the computational complexity of the problem and provides very clear physical interpretation of conduction phenomena in the narrow pores.

Reprint Address:
Kharkyanen, VN, Natl Acad Sci Ukraine, Inst Phys, Dept Phys Biol Syst, Prospect Nauki 46, UA-03039 Kiev, Ukraine.

Research Institution addresses:
[Kharkyanen, Valery N.; Yesylevskyy, Semen O.; Berezetskaya, Natalia M.] Natl Acad Sci Ukraine, Inst Phys, Dept Phys Biol Syst, UA-03039 Kiev, Ukraine

Cited References:
AKSIMENTIEV A, 2005, BIOPHYS J, V88, P3745, DOI 10.1529/biophysj.104.058727.
BERNECHE S, 2000, BIOPHYS J, V78, P2900.
BERNECHE S, 2001, NATURE, V414, P73.
CHANG S, 1999, BIOPHYS J, V77, P2517.
CHUNG SH, 2002, BIOPHYS J, V82, P628.
COMPOINT M, 2004, BBA-BIOMEMBRANES, V1661, P26, DOI 10.1016/j.bbamem.2003.11.019.
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HILLE B, 2001, ION CHANNELS EXCITAB.
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KHARKYANEN VN, 2009, PHYS REV E 1, V80, ARTN 031118.
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ZHU FQ, 2003, BIOPHYS J, V85, P236.

Cited Reference Count:
19

Times Cited:
0

Publisher:
AMER PHYSICAL SOC; ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA

Subject Category:
Physics, Fluids & Plasmas; Physics, Mathematical

ISSN:
1539-3755

DOI:
10.1103/PhysRevE.82.051103

IDS Number:
674VF

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Friday, November 12, 2010

ISI Web of Knowledge Alert - Hummer, G

ISI Web of Knowledge Citation Alert

Cited Article: Hummer, G. Water conduction through the hydrophobic channel of a carbon nanotube
Alert Expires: 22 AUG 2011
Number of Citing Articles: 1 new records this week (1 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Hydrophobic Peptide Channels and Encapsulated Water Wires

Authors:
Raghavender, US; Kantharaju; Aravinda, S; Shamala, N; Balaram, P

Author Full Names:
Raghavender, Upadhyayula S.; Kantharaju; Aravinda, Subrayashastry; Shamala, Narayanaswamy; Balaram, Padmanabhan

Source:
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 132 (3): 1075-1086 JAN 27 2010

Language:
English

Document Type:
Article

KeyWords Plus:
ASSEMBLING ORGANIC NANOTUBES; TRANSMEMBRANE ION CHANNELS; M2 PROTON CHANNEL; MOLECULAR-DYNAMICS; CRYSTAL-STRUCTURES; RHODOBACTER-SPHAEROIDES; BIOMOLECULAR SYSTEMS; CARBONIC-ANHYDRASE; NAK CHANNEL; CHAIN

Abstract:
Peptide nanotubes with filled and empty pores and close-packed structures are formed in closely related pentapeptides. Enantiomorphic sequences, Boc-(D)Pro-Aib-Xxx-Aib-Val-OMe (Xxx = Leu, 1; Val, 2; Ala, 3; Phe, 4) and Boc-Pro-Aib-(D)Xxx-Aib-(D)Val-OMe ((XXX)-X-D = (D)Leu, 5; (D)Val, 6; (D)Ala, 7; (D)Phe, 8), yield molecular structures with a very similar backbone conformation but varied packing patterns in crystals. Peptides 1, 2, 5, and 6 show tubular structures with the molecules self-assembling along the crystallographic six-fold axis (c-axis) and revealing a honeycomb arrangement laterally (ab plane). Two forms of entrapped water wires have been characterized in 2: 2a with d(O center dot center dot center dot O) = 2.6 angstrom and 2b with d(O center dot center dot center dot O) = 3.5 angstrom. The latter is observed in 6 (6a) also. A polymorphic form of 6 (6b), grown from a solution of methanol-water, was observed to crystallize in a monoclinic system as a close-packed s
tructure. Single-file water wire arrangements encapsulated inside hydrophobic channels formed by peptide nanotubes could be established by modeling the published structures in the cases of a cyclic peptide and a dipeptide. In all the entrapped water wires, each water molecule is involved in a hydrogen bond with a previous and succeeding water molecule. The O-H group of the water not involved in any hydrogen bond does not seem to be involved in an energetically significant interaction with the nanotube interior, a general feature of the one-dimensional water wires encapsulated in hydrophobic environements. Water wires in hydrophobic channels are contrasted with the single-file arrangements in amphipathic channels formed by aquaporins.

Reprint Address:
Shamala, N, Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India.

Research Institution addresses:
[Raghavender, Upadhyayula S.; Aravinda, Subrayashastry; Shamala, Narayanaswamy] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India; [Kantharaju; Balaram, Padmanabhan] Indian Inst Sci, Mol Biophys Unit, Bangalore 560012, Karnataka, India

E-mail Address:
shamala@physics.iisc.ernet.in; pb@mbu.iisc.ernet.in

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Cited Reference Count:
74

Times Cited:
2

Publisher:
AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA

Subject Category:
Chemistry, Multidisciplinary

ISSN:
0002-7863

DOI:
10.1021/ja9083978

IDS Number:
562VZ

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Friday, November 5, 2010

ISI Web of Knowledge Alert Expiration Notice

ISI Web of Knowledge Citation Alert Expiration Notice

Cited Article: Zhou, X. Equilibrium and kinetics: Water confined in carbon nanotubes as one-dimensional lattice gas
Alert Expires: 09 NOV 2010
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b

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ISI Web of Knowledge Alert Expiration Notice

ISI Web of Knowledge Citation Alert Expiration Notice

Cited Article: Maibaum, L. A coarse-grained model of water confined in a hydrophobic tube
Alert Expires: 09 NOV 2010
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b

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ISI Web of Knowledge Alert Expiration Notice

ISI Web of Knowledge Citation Alert Expiration Notice

Cited Article: Saparov, S. Mobility of a one-dimensional confined file of water molecules as a function of file length
Alert Expires: 09 NOV 2010
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b

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ISI Web of Knowledge Alert - Ghosh, S

ISI Web of Knowledge Citation Alert

Cited Article: Ghosh, S. Carbon nanotube flow sensors
Alert Expires: 09 NOV 2010
Number of Citing Articles: 3 new records this week (3 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Molecular Dynamics Simulation of Composite Nanochannels as Nanopumps Driven by Symmetric Temperature Gradients

Authors:
Liu, C; Li, ZG

Author Full Names:
Liu, Chong; Li, Zhigang

Source:
PHYSICAL REVIEW LETTERS 105 (17): Art. No. 174501 OCT 18 2010

Language:
English

Document Type:
Article

KeyWords Plus:
BOUNDARY-CONDITIONS; FLOW; SLIP

Abstract:
In this Letter, we propose a composite nanochannel system, where half of the channel is of low surface energy, while the other half has a relatively high surface energy. Molecular dynamics simulations show that fluids in such channels can be continuously driven by a symmetric temperature gradient. In the low surface energy part, the fluid moves from high to low temperature, while the fluid migrates from low to high temperature in the high surface energy part. The mechanisms that govern the flow are explained and the conditions required to guarantee the flow and the possible applications are discussed.

Reprint Address:
Liu, C, Hong Kong Univ Sci & Technol, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China.

Research Institution addresses:
[Liu, Chong; Li, Zhigang] Hong Kong Univ Sci & Technol, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China

E-mail Address:
mezli@ust.hk

Cited References:
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Cited Reference Count:
22

Times Cited:
0

Publisher:
AMER PHYSICAL SOC; ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA

Subject Category:
Physics, Multidisciplinary

ISSN:
0031-9007

DOI:
10.1103/PhysRevLett.105.174501

IDS Number:
665SB

========================================================================

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Title:
Molecular Dynamics Simulation of Composite Nanochannels as Nanopumps Driven by Symmetric Temperature Gradients

Authors:
Liu, C; Li, ZG

Author Full Names:
Liu, Chong; Li, Zhigang

Source:
PHYSICAL REVIEW LETTERS 105 (17): - OCT 18 2010

Language:
English

Document Type:
Article

KeyWords Plus:
BOUNDARY-CONDITIONS; FLOW; SLIP

Abstract:
In this Letter, we propose a composite nanochannel system, where half of the channel is of low surface energy, while the other half has a relatively high surface energy. Molecular dynamics simulations show that fluids in such channels can be continuously driven by a symmetric temperature gradient. In the low surface energy part, the fluid moves from high to low temperature, while the fluid migrates from low to high temperature in the high surface energy part. The mechanisms that govern the flow are explained and the conditions required to guarantee the flow and the possible applications are discussed.

Reprint Address:
Liu, C, Hong Kong Univ Sci & Technol, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China.

Research Institution addresses:
[Liu, Chong; Li, Zhigang] Hong Kong Univ Sci & Technol, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China

E-mail Address:
mezli@ust.hk

Cited References:
ALLEN MP, 1987, COMPUTER SIMULATION.
BRZOSKA JB, 1993, LANGMUIR, V9, P2220.
CHAUDHURY MK, 1992, SCIENCE, V256, P1539.
CIEPLAK M, 2001, PHYS REV LETT, V86, P803.
DARHUBER AA, 2005, ANNU REV FLUID MECH, V37, P425, DOI 10.1146/annurev.fluid.36.050802.122052.
DUKE TAJ, 1998, PHYS REV LETT, V80, P1552.
GARIMELLA SV, 2006, MICROELECTRON J, V37, P1165, DOI 10.1016/j.mejo.2005.07.017.
GHOSH S, 2003, SCIENCE, V299, P1042, DOI 10.1126/science.1079080.
GONG XJ, 2007, NAT NANOTECHNOL, V2, P709, DOI 10.1038/nnano.2007.320.
GUTTENBERG Z, 2004, PHYS REV E 2, V70, ARTN 056311.
HEINBUCH U, 1989, PHYS REV A, V40, P1144.
LI ZG, 2005, PHYS REV LETT, V95, ARTN 014502.
LI ZG, 2007, J CHEM PHYS, V127, P74706, ARTN 074706.
LI ZG, 2009, PHYS REV E 1, V80, ARTN 061204.
LIU C, 2009, PHYS REV E 2, V80, ARTN 036302.
PENNATHUR S, 2005, ANAL CHEM, V77, P6782, DOI 10.1021/ac0508346.
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Cited Reference Count:
22

Times Cited:
0

Publisher:
AMER PHYSICAL SOC; ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA

Subject Category:
Physics, Multidisciplinary

ISSN:
0031-9007

IDS Number:
665SB

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Title:
Carbon nanotube-guided thermopower waves

Authors:
Choi, W; Abrahamson, JT; Strano, JM; Strano, MS

Author Full Names:
Choi, Wonjoon; Abrahamson, Joel T.; Strano, Jennifer M.; Strano, Michael S.

Source:
MATERIALS TODAY 13 (10): 22-33 OCT 2010

Language:
English

Document Type:
Review

KeyWords Plus:
DIMENSIONAL THERMOELECTRIC-MATERIALS; RDX FLAME STRUCTURE; TRANSPORT-PROPERTIES; TELLURIDE NANOWIRES; HYDROGEN GENERATOR; SILICON NANOWIRES; POWER-GENERATION; BI NANOWIRES; COMBUSTION; IGNITION

Abstract:
Thermopower waves are a new concept for the direct conversion of chemical to electrical energy. A nanowire with large axial thermal diffusivity can accelerate a self-propagating reaction wave using a fuel coated along its length. The reaction wave drives electrical carriers in a thermopower wave, creating a high-power pulse of as much as 7 kW/kg in experiments using carbon nanotubes. We review nanomaterials designed to overcome limitations of thermoelectricity and explore the emerging scientific and practical outlook for devices using thermopower waves.

Reprint Address:
Strano, MS, MIT, Dept Chem Engn, Cambridge, MA 02139 USA.

Research Institution addresses:
[Choi, Wonjoon; Abrahamson, Joel T.; Strano, Jennifer M.; Strano, Michael S.] MIT, Dept Chem Engn, Cambridge, MA 02139 USA; [Choi, Wonjoon] MIT, Dept Mech Engn, Cambridge, MA 02139 USA

E-mail Address:
strano@mit.edu

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76

Times Cited:
0

Publisher:
ELSEVIER SCI LTD; THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND

Subject Category:
Materials Science, Multidisciplinary

ISSN:
1369-7021

IDS Number:
665QB

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