Friday, February 18, 2011

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: 4 new records this week (4 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Dry amyloid fibril assembly in a yeast prion peptide is mediated by long-lived structures containing water wires

Authors:
Reddy, G; Straub, JE; Thirumalai, D

Author Full Names:
Reddy, Govardhan; Straub, John E.; Thirumalai, D.

Source:
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 107 (50): 21459-21464 DEC 14 2010

Language:
English

Document Type:
Article

Author Keywords:
amyloid fibrils; dewetting transition; electrostatic interactions; prion diseases

KeyWords Plus:
CROSS-BETA-SPINE; HYDROPHOBIC HYDRATION; PROTEIN AGGREGATION; NANOTUBES; DYNAMICS; KINETICS; COLLAPSE; MODELS; FORCES

Abstract:
Amyloid-like fibrils from a number of small peptides that are unrelated by sequence adopt a cross-beta-spine in which the two sheets fully interdigitate to create a dry interface. Formation of such a dry interface is usually associated with self-assembly of extended hydrophobic surfaces. Here we investigate how a dry interface is created in the process of protofilament formation in vastly different sequences using two amyloidogenic peptides, one a polar sequence from the N terminus of the yeast prion Sup35 and the other a predominantly hydrophobic sequence from the C terminus of A beta-peptide. Using molecular dynamics simulations with three force fields we show that spontaneous formation of two ordered one-dimensional water wires in the pore between the two sheets of the Sup35 protofilaments results in long-lived structures, which are stabilized by a network of hydrogen bonds between the water molecules in the wires and the polar side chains in the beta-sheet. Upon decreasin
g the stability of the metastable structures, water molecules are expelled resulting in a helically twisted protofilament in which side chains from a pair of beta-strands in each sheet pack perfectly resulting in a dry interface. Although drying in hydrophobically dominated interfaces is abrupt, resembling a liquid to vapor transition, we find that discrete transitions between the liquid to one-dimensional ordered water in the nanopore enclosed by the two beta-sheets to dry interface formation characterizes protofilament assembly in the yeast prions. Indeed, as the two sheets of the hydrophobic A beta-sequence approach each other, fibril formation and expulsion of water molecules occur rapidly and nearly simultaneously.

Reprint Address:
Thirumalai, D, Univ Maryland, Biophys Program, Inst Phys Sci & Technol, College Pk, MD 20742 USA.

Research Institution addresses:
[Reddy, Govardhan; Thirumalai, D.] Univ Maryland, Biophys Program, Inst Phys Sci & Technol, College Pk, MD 20742 USA; [Thirumalai, D.] Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA; [Straub, John E.] Boston Univ, Dept Chem, Boston, MA 02215 USA

E-mail Address:
thirum@umd.edu

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Cited Reference Count:
30

Times Cited:
0

Publisher:
NATL ACAD SCIENCES; 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA

Subject Category:
Multidisciplinary Sciences

ISSN:
0027-8424

DOI:
10.1073/pnas.1008616107

IDS Number:
697NY

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Title:
Self-assembly of carbon nanotubes and boron nitride nanotubes into coaxial structures

Authors:
Kuang, YD; Shi, SQ; Chan, PKL; Chen, CY

Author Full Names:
Kuang, Y. D.; Shi, S. Q.; Chan, P. K. L.; Chen, C. Y.

Source:
COMPUTATIONAL MATERIALS SCIENCE 50 (2): 645-650 DEC 2010

Language:
English

Document Type:
Article

Author Keywords:
Carbon nanotubes and boron nitride nanotubes; Self-assembly; Molecular dynamics simulations; Polarization; Nanodevices

KeyWords Plus:
MOLECULAR-DYNAMICS; ELASTIC-MODULUS; WATER; DEFORMATION; SIMULATIONS; BEHAVIOR; SYSTEMS; LAYERS

Abstract:
Coaxial carbon nanotube/boron nitride nanotube (CNT/BNNT) multi-walled structures are ideal components in nanoelectronic systems. Our molecular dynamics simulations show that separate CNTs and BNNTs can self-assemble into stable coaxial structures in water under appropriate conditions. In case study three types of representative coaxial structures: (5, 5) CNT/(10, 10) BNNT, (5,5) BNNT/(10, 10) CNT and (5, 5) BNNT/(10, 10) BNNT are obtained. Simulation results also reveal that the self-assembly time between two separate BNNTs is increased remarkably due to the polarization of BNNTs in water. The mechanism of self-assembly among these tubes is demonstrated in detail. Further, coaxial (10, 10) BNNT/(10, 10) CNT/(15, 15) BNNT nanoheterojunctions are achieved for potential application in nanoelectronic systems. The present work shows the feasibility to fabricate the coaxial nanodevices such as insulating high-strength cables, high frequency oscillators and nanojunctions using self
-assembly approach. (C) 2010 Elsevier B.V. All rights reserved.

Reprint Address:
Shi, SQ, Hong Kong Polytech Univ, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China.

Research Institution addresses:
[Kuang, Y. D.; Shi, S. Q.; Chan, P. K. L.] Hong Kong Polytech Univ, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China; [Kuang, Y. D.; Chen, C. Y.] Huazhong Univ Sci & Technol, Sch Civil Engn & Mech, Wuhan 430074, Hubei, Peoples R China

E-mail Address:
mmsqshi@polyu.edu.hk

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Cited Reference Count:
30

Times Cited:
0

Publisher:
ELSEVIER SCIENCE BV; PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS

Subject Category:
Materials Science, Multidisciplinary

ISSN:
0927-0256

DOI:
10.1016/j.commatsci.2010.09.029

IDS Number:
699IR

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Title:
Time-resolved red luminescence from europium-catalyzed single walled carbon nanotubes

Authors:
Sitharaman, B; Rajamani, S; Avti, PK

Author Full Names:
Sitharaman, Balaji; Rajamani, Saathyaki; Avti, Pramod K.

Source:
CHEMICAL COMMUNICATIONS 47 (5): 1607-1609 2011

Language:
English

Document Type:
Article

KeyWords Plus:
LANTHANIDE COMPLEXES; ABSORPTION; PROTEINS; LIGANDS; PROBES; WATER; IONS; DNA

Abstract:
The photo-physical properties of Eu-SWCNTs indicate that intrinsic excitonic properties of SWCNTs sensitize the lanthanoid element europium (Eu) to emit time-resolved red luminescence.

Reprint Address:
Sitharaman, B, SUNY Stony Brook, Dept Biomed Engn, Stony Brook, NY 11794 USA.

Research Institution addresses:
[Sitharaman, Balaji; Rajamani, Saathyaki; Avti, Pramod K.] SUNY Stony Brook, Dept Biomed Engn, Stony Brook, NY 11794 USA

E-mail Address:
Balaji.Sitharaman@stonybrook.edu

Cited References:
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Cited Reference Count:
24

Times Cited:
0

Publisher:
ROYAL SOC CHEMISTRY; THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND

Subject Category:
Chemistry, Multidisciplinary

ISSN:
1359-7345

DOI:
10.1039/c0cc03014g

IDS Number:
708UJ

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Title:
Application of nonlocal beam models to double-walled carbon nanotubes under a moving nanoparticle. Part I: theoretical formulations

Authors:
Kiani, K

Author Full Names:
Kiani, Keivan

Source:
ACTA MECHANICA 216 (1-4): 165-195 2011

Language:
English

Document Type:
Article

KeyWords Plus:
DER-WAALS FORCES; CONTINUUM-MECHANICS; FLUID-FLOW; MASS; INSTABILITY; COMPOSITES; ELASTICITY; VIBRATIONS; TRACKS; WATER

Abstract:
The current work suggests mathematical models for the vibration of double-walled carbon nanotubes (DWCNTs) subjected to a moving nanoparticle by using nonlocal classical and shear deformable beam theories. The van der Waals interaction forces between atoms of the innermost and outermost tubes are modeled by an elastic layer. The equations of motion are derived for the nonlocal double body Euler-Bernoulli, Timoshenko and higher-order beams connected by a flexible layer under excitation of a moving nanoparticle. Analytical solutions of the problem are provided for the aforementioned nonlocal beam models with simply supported boundary conditions. The dynamical deflections and nonlocal bending moments of the innermost and outermost tubes are then obtained during the courses of excitation and free vibration. Finally, the critical velocities of the moving nanoparticle associated with the nonlocal beam theories are expressed in terms of small-scale effect parameter, geometry, and ma
terial properties of DWCNTs.

Reprint Address:
Kiani, K, Sharif Univ Technol, Dept Civil Engn, POB 11365-9313, Tehran, Iran.

Research Institution addresses:
Sharif Univ Technol, Dept Civil Engn, Tehran, Iran

E-mail Address:
k_kiani@civil.sharif.edu

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Cited Reference Count:
41

Times Cited:
3

Publisher:
SPRINGER WIEN; SACHSENPLATZ 4-6, PO BOX 89, A-1201 WIEN, AUSTRIA

Subject Category:
Mechanics

ISSN:
0001-5970

DOI:
10.1007/s00707-010-0362-1

IDS Number:
708LC

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