Friday, June 12, 2009

ISI Web of Knowledge Alert - Saparov, S

ISI Web of Knowledge Citation Alert

Cited Article: Saparov, S. Mobility of a one-dimensional confined file of water molecules as a function of file length
Alert Expires: 22 OCT 2009
Number of Citing Articles: 2 new records this week (2 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Teaching Old Coefficients New Tricks: New Insight into the Meaning of the Osmotic and Diffusive Permeation Coefficients

Authors:
Beckstein, O

Author Full Names:
Beckstein, Oliver

Source:
BIOPHYSICAL JOURNAL 96 (3): 763-764 FEB 4 2009

Language:
English

Document Type:
News Item

KeyWords Plus:
WATER; PORES

Reprint Address:
Beckstein, O, Univ Oxford, Dept Biochem, Struct Bioinformat & Computat Biochem Unit, Oxford OX1 3QU, England.

Research Institution addresses:
[Beckstein, Oliver] Univ Oxford, Dept Biochem, Struct Bioinformat & Computat Biochem Unit, Oxford OX1 3QU, England; [Beckstein, Oliver] Johns Hopkins Univ, Sch Med, Dept Physiol, Baltimore, MD 21205 USA

E-mail Address:
oliver.beckstein@bioch.ox.ac.uk

Cited References:
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ZEUTHEN T, 2002, INT REV CYTOL, V215, P203.
ZHU FQ, 2004, PHYS REV LETT, V93, ARTN 224501.

Cited Reference Count:
9

Times Cited:
0

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

Subject Category:
Biophysics

ISSN:
0006-3495

DOI:
10.1016/j.bpj.2008.10.048

IDS Number:
450CB

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Title:
Determinants of Water Permeability through Nanoscopic Hydrophilic Channels

Authors:
Portella, G; de Groot, BL

Author Full Names:
Portella, Guillem; de Groot, Bert L.

Source:
BIOPHYSICAL JOURNAL 96 (3): 925-938 FEB 4 2009

Language:
English

Document Type:
Article

KeyWords Plus:
PARTICLE MESH EWALD; SINGLE-FILE PORE; MOLECULAR-DYNAMICS; GRAMICIDIN CHANNEL; PEPTIDE NANOTUBES; PROTON EXCLUSION; CARBON NANOTUBE; CELL-MEMBRANE; ION CHANNELS; FORCE-FIELD

Abstract:
Naturally occurring pores show a variety of polarities and sizes that are presumably directly linked to their biological function. Many biological channels are selective toward permeants similar or smaller in size than water molecules, and therefore their pores operate in the regime of single-file water pores. Intrinsic factors affecting water permeability through such pores include the channel-membrane match, the structural stability of the channel, the channel geometry and channel-water affinity. We present an extensive molecular dynamics study on the role of the channel geometry and polarity on the water osmotic and diffusive permeability coefficients. We show that the polarity of the naturally occurring peptidic channels is close to optimal for water permeation, and that the water mobility for a wide range of channel polarities is essentially length independent. By systematically varying the geometry and polarity of model hydrophilic pores, based on the fold of gramicidi!
n A, the water density, occupancy, and permeability are studied. Our focus is on the characterization of the transition between different permeation regimes in terms of the structure of water in the pores, the average pore occupancy and the dynamics of the permeating water molecules. We show that a general relationship between osmotic and diffusive water permeability coefficients in the single-file regime accounts for the time averaged pore occupancy, and that the dynamics of the permeating water molecules through narrow non single file channels effectively behaves like independent single-file columns.

Reprint Address:
de Groot, BL, Max Planck Inst Biophys Chem, Computat Biomol Dynam Grp, D-37077 Gottingen, Germany.

Research Institution addresses:
[Portella, Guillem; de Groot, Bert L.] Max Planck Inst Biophys Chem, Computat Biomol Dynam Grp, D-37077 Gottingen, Germany

E-mail Address:
bgroot@gwdg.de

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Cited Reference Count:
65

Times Cited:
0

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

Subject Category:
Biophysics

ISSN:
0006-3495

DOI:
10.1016/j.bpj.2008.09.059

IDS Number:
450CB

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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 OCT 2009
Number of Citing Articles: 4 new records this week (4 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
========================================================================
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Title:
Intrinsic Ion Selectivity of Narrow Hydrophobic Pores

Authors:
Song, C; Corry, B

Author Full Names:
Song, Chen; Corry, Ben

Source:
JOURNAL OF PHYSICAL CHEMISTRY B 113 (21): 7642-7649 MAY 28 2009

Language:
English

Document Type:
Article

KeyWords Plus:
CARBON NANOTUBE MEMBRANES; FREE-ENERGY CALCULATIONS; MOLECULAR-DYNAMICS; MEAN FORCE; ACETYLCHOLINE-RECEPTOR; POTASSIUM CHANNEL; PEPTIDE NANOTUBE; WATER TRANSPORT; MASS-TRANSPORT; K+ ION

Abstract:
We show that narrow hydrophobic pores have an intrinsic ion selectivity by using single-walled carbon nanotube membranes as a model. We examined pores of radius 3.4-6.1 angstrom, and conducted molecular dynamics simulations to show that Na+, K+, and Cl- face different free energy barriers when entering hydrophobic pores. Most of the differences result from the different dehydration energies of the ions; however, changes in the solvation shell structure in the confined nanotube interior and van der Waals interactions in the small tubes can both play a role. Molecular dynamics simulations conducted under hydrostatic pressure show that carbon nanotube membranes can act as ion sieves, with the pore radius and pressure determining which ions will permeate through the membrane. This work suggests that the intrinsic ion selectivity of biological pores of differing radii might also play a role in determining their selectivity, in addition to the more common explanations based on ele!
ctrostatic effects. In addition, "hydrophobic gating" can arise in continuous water-filled pores.

Reprint Address:
Corry, B, Univ Western Australia, Sch Biomed Biomol & Chem Sci, Crawley, WA 6009, Australia.

Research Institution addresses:
[Song, Chen; Corry, Ben] Univ Western Australia, Sch Biomed Biomol & Chem Sci, Crawley, WA 6009, Australia

E-mail Address:
ben.corry@uwa.edu.au

Cited References:
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Cited Reference Count:
52

Times Cited:
0

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

Subject Category:
Chemistry, Physical

ISSN:
1520-6106

DOI:
10.1021/jp810102u

IDS Number:
448YA

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

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Title:
Fabrication and characterization of carbon nanotubes immobilized in porous polymeric membranes

Authors:
Sae-Khow, O; Mitra, S

Author Full Names:
Sae-Khow, Ornthida; Mitra, Somenath

Source:
JOURNAL OF MATERIALS CHEMISTRY 19 (22): 3713-3718 2009

Language:
English

Document Type:
Article

KeyWords Plus:
MIXED MATRIX MEMBRANES; HOLLOW-FIBER MEMBRANES; GAS SEPARATION; BENZENE/CYCLOHEXANE MIXTURES; PERVAPORATION SEPARATION; POLY(VINYL ALCOHOL); HYBRID MEMBRANES; BARRIER FILM; EXTRACTION; CHROMATOGRAPHY

Abstract:
We demonstrate that the incorporation of carbon nanotubes (CNTs) in the pores of a membrane can offer several advantages. A dispersion of CNTs in polyvinylidene fluoride was injected through a porous membrane, which immobilized the nanotubes in the pore structure. The CNTs served as a sorbent facilitating solute exchange between the two phases leading to enhancement of the enrichment factor by as much as 93%. The presence of CNTs also developed a diffusion barrier by sorbing solvent on its surface, which led to higher retention of the extractant within the membrane.

Reprint Address:
Mitra, S, New Jersey Inst Technol, Dept Chem & Environm Sci, Newark, NJ 07102 USA.

Research Institution addresses:
[Sae-Khow, Ornthida; Mitra, Somenath] New Jersey Inst Technol, Dept Chem & Environm Sci, Newark, NJ 07102 USA

E-mail Address:
Mitra@njit.edu

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Cited Reference Count:
30

Times Cited:
0

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

Subject Category:
Chemistry, Physical; Materials Science, Multidisciplinary

ISSN:
0959-9428

DOI:
10.1039/b822879e

IDS Number:
450OO

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

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Title:
Determinants of Water Permeability through Nanoscopic Hydrophilic Channels

Authors:
Portella, G; de Groot, BL

Author Full Names:
Portella, Guillem; de Groot, Bert L.

Source:
BIOPHYSICAL JOURNAL 96 (3): 925-938 FEB 4 2009

Language:
English

Document Type:
Article

KeyWords Plus:
PARTICLE MESH EWALD; SINGLE-FILE PORE; MOLECULAR-DYNAMICS; GRAMICIDIN CHANNEL; PEPTIDE NANOTUBES; PROTON EXCLUSION; CARBON NANOTUBE; CELL-MEMBRANE; ION CHANNELS; FORCE-FIELD

Abstract:
Naturally occurring pores show a variety of polarities and sizes that are presumably directly linked to their biological function. Many biological channels are selective toward permeants similar or smaller in size than water molecules, and therefore their pores operate in the regime of single-file water pores. Intrinsic factors affecting water permeability through such pores include the channel-membrane match, the structural stability of the channel, the channel geometry and channel-water affinity. We present an extensive molecular dynamics study on the role of the channel geometry and polarity on the water osmotic and diffusive permeability coefficients. We show that the polarity of the naturally occurring peptidic channels is close to optimal for water permeation, and that the water mobility for a wide range of channel polarities is essentially length independent. By systematically varying the geometry and polarity of model hydrophilic pores, based on the fold of gramicidi!
n A, the water density, occupancy, and permeability are studied. Our focus is on the characterization of the transition between different permeation regimes in terms of the structure of water in the pores, the average pore occupancy and the dynamics of the permeating water molecules. We show that a general relationship between osmotic and diffusive water permeability coefficients in the single-file regime accounts for the time averaged pore occupancy, and that the dynamics of the permeating water molecules through narrow non single file channels effectively behaves like independent single-file columns.

Reprint Address:
de Groot, BL, Max Planck Inst Biophys Chem, Computat Biomol Dynam Grp, D-37077 Gottingen, Germany.

Research Institution addresses:
[Portella, Guillem; de Groot, Bert L.] Max Planck Inst Biophys Chem, Computat Biomol Dynam Grp, D-37077 Gottingen, Germany

E-mail Address:
bgroot@gwdg.de

Cited References:
AGRE P, 2004, ANGEW CHEM INT EDIT, V43, P4278, DOI 10.1002/anie.200460804.
ALEXANDER S, 1978, PHYS REV B, V18, P2011.
ALLEN R, 2002, PHYS REV LETT, V89, ARTN 175502.
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Cited Reference Count:
65

Times Cited:
0

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

Subject Category:
Biophysics

ISSN:
0006-3495

DOI:
10.1016/j.bpj.2008.09.059

IDS Number:
450CB

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Title:
Dielectric Properties of Water inside Single-Walled Carbon Nanotubes

Authors:
Mikami, F; Matsuda, K; Kataura, H; Maniwa, Y

Author Full Names:
Mikami, Fuminori; Matsuda, Kazuyuki; Kataura, Hiromichi; Maniwa, Yutaka

Source:
ACS NANO 3 (5): 1279-1287 MAY 2009

Language:
English

Document Type:
Article

Author Keywords:
carbon nanotubes; ferroelectric; water; ice nanotubes; dielectric property

KeyWords Plus:
X-RAY-DIFFRACTION; ICE-NANOTUBES; LIQUID WATER; TRANSITION; DYNAMICS

Abstract:
In this paper, we report novel ferroelectric properties of a new form of ice inside single-walled carbon nanotubes (SWCNTs). These are called "ice nanotubes" (ice NTs) and they consist of polygonal water rings stacked one-dimensionally along the SWCNT axis. We performed molecular dynamics (MD) calculations for the ice NTs under an external electric field and in a temperature range between 100 and 350 K. It is revealed that ice NTs show stepwise polarization with a significant hysteresis loop as a function of the external field strength. In particular, pentagonal and heptagonal ice NTs are found to be the world's smallest ferroelectrics with spontaneous polarization of around 1 mu C/cm(2). The n-gonal ice NT, where n = 5, 6, or 7, has (n + 1)-polarized structures with different polarizations. These findings suggest potential applications of SWCNTs encapsulating dielectric materials for the fabrication of the smallest ferroelectric devices. Experimental evidence for the presen!
ce of ice NTs inside SWCNTs is also discussed in great detail.

Reprint Address:
Maniwa, Y, Tokyo Metropolitan Univ, Fac Sci, Dept Phys, 1-1 Minami Osawa, Tokyo 1920397, Japan.

Research Institution addresses:
[Mikami, Fuminori; Matsuda, Kazuyuki; Maniwa, Yutaka] Tokyo Metropolitan Univ, Fac Sci, Dept Phys, Tokyo 1920397, Japan; [Kataura, Hiromichi] Natl Inst Adv Ind Sci & Technol, Nanotechnol Inst, Tsukuba, Ibaraki 3058562, Japan; [Kataura, Hiromichi; Maniwa, Yutaka] JST, CREST, Kawaguchi, Saitama 3320012, Japan

E-mail Address:
maniwa@phys.metro-u.ac.jp

Cited References:
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Cited Reference Count:
32

Times Cited:
0

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

Subject Category:
Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary

ISSN:
1936-0851

DOI:
10.1021/nn900221t

IDS Number:
449IH

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Thursday, June 11, 2009

ISI Web of Knowledge Alert - Holt JK

ISI Web of Knowledge Citation Alert

Cited Article: Holt JK. Fast mass transport through sub-2-nanometer carbon nanotubes
Alert Expires: 18 OCT 2009
Number of Citing Articles: 2 new records this week (2 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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PT J
*Record 1 of 2.
L5 <http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS&DestLinkType=FullRecord;UT=000266296700032>
*Order Full Text [ ]
AU Song, C
Corry, B
AF Song, Chen
Corry, Ben
TI Intrinsic Ion Selectivity of Narrow Hydrophobic Pores
SO JOURNAL OF PHYSICAL CHEMISTRY B
LA English
DT Article
ID CARBON NANOTUBE MEMBRANES; FREE-ENERGY CALCULATIONS;
MOLECULAR-DYNAMICS; MEAN FORCE; ACETYLCHOLINE-RECEPTOR; POTASSIUM
CHANNEL; PEPTIDE NANOTUBE; WATER TRANSPORT; MASS-TRANSPORT; K+ ION
AB We show that narrow hydrophobic pores have an intrinsic ion selectivity
by using single-walled carbon nanotube membranes as a model. We
examined pores of radius 3.4-6.1 angstrom, and conducted molecular
dynamics simulations to show that Na+, K+, and Cl- face different free
energy barriers when entering hydrophobic pores. Most of the
differences result from the different dehydration energies of the ions;
however, changes in the solvation shell structure in the confined
nanotube interior and van der Waals interactions in the small tubes can
both play a role. Molecular dynamics simulations conducted under
hydrostatic pressure show that carbon nanotube membranes can act as ion
sieves, with the pore radius and pressure determining which ions will
permeate through the membrane. This work suggests that the intrinsic
ion selectivity of biological pores of differing radii might also play
a role in determining their selectivity, in addition to the more common
explanations based on electrostatic effects. In addition, "hydrophobic
gating" can arise in continuous water-filled pores.
C1 [Song, Chen; Corry, Ben] Univ Western Australia, Sch Biomed Biomol & Chem Sci, Crawley, WA 6009, Australia.
RP Corry, B, Univ Western Australia, Sch Biomed Biomol & Chem Sci,
Crawley, WA 6009, Australia.
EM ben.corry@uwa.edu.au
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NR 52
TC 0
PU AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1520-6106
DI 10.1021/jp810102u
PD MAY 28
VL 113
IS 21
BP 7642
EP 7649
SC Chemistry, Physical
GA 448YA
UT ISI:000266296700032
ER

PT J
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AU Sae-Khow, O
Mitra, S
AF Sae-Khow, Ornthida
Mitra, Somenath
TI Fabrication and characterization of carbon nanotubes immobilized in
porous polymeric membranes
SO JOURNAL OF MATERIALS CHEMISTRY
LA English
DT Article
ID MIXED MATRIX MEMBRANES; HOLLOW-FIBER MEMBRANES; GAS SEPARATION;
BENZENE/CYCLOHEXANE MIXTURES; PERVAPORATION SEPARATION; POLY(VINYL
ALCOHOL); HYBRID MEMBRANES; BARRIER FILM; EXTRACTION; CHROMATOGRAPHY
AB We demonstrate that the incorporation of carbon nanotubes (CNTs) in the
pores of a membrane can offer several advantages. A dispersion of CNTs
in polyvinylidene fluoride was injected through a porous membrane,
which immobilized the nanotubes in the pore structure. The CNTs served
as a sorbent facilitating solute exchange between the two phases
leading to enhancement of the enrichment factor by as much as 93%. The
presence of CNTs also developed a diffusion barrier by sorbing solvent
on its surface, which led to higher retention of the extractant within
the membrane.
C1 [Sae-Khow, Ornthida; Mitra, Somenath] New Jersey Inst Technol, Dept Chem & Environm Sci, Newark, NJ 07102 USA.
RP Mitra, S, New Jersey Inst Technol, Dept Chem & Environm Sci, Newark, NJ
07102 USA.
EM Mitra@njit.edu
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10.1016/S0021-9673(03)00562-4
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NR 30
TC 0
PU ROYAL SOC CHEMISTRY; THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD,
CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 0959-9428
DI 10.1039/b822879e
VL 19
IS 22
BP 3713
EP 3718
SC Chemistry, Physical; Materials Science, Multidisciplinary
GA 450OO
UT ISI:000266410900023
ER

EF

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ISI Web of Knowledge Alert - Majumder M

ISI Web of Knowledge Citation Alert

Cited Article: Majumder M. Nanoscale hydrodynamics - Enhanced flow in carbon nanotubes
Alert Expires: 18 OCT 2009
Number of Citing Articles: 1 new records this week (1 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Fabrication and characterization of carbon nanotubes immobilized in porous polymeric membranes

Authors:
Sae-Khow, O; Mitra, S

Author Full Names:
Sae-Khow, Ornthida; Mitra, Somenath

Source:
JOURNAL OF MATERIALS CHEMISTRY 19 (22): 3713-3718 2009

Language:
English

Document Type:
Article

KeyWords Plus:
MIXED MATRIX MEMBRANES; HOLLOW-FIBER MEMBRANES; GAS SEPARATION; BENZENE/CYCLOHEXANE MIXTURES; PERVAPORATION SEPARATION; POLY(VINYL ALCOHOL); HYBRID MEMBRANES; BARRIER FILM; EXTRACTION; CHROMATOGRAPHY

Abstract:
We demonstrate that the incorporation of carbon nanotubes (CNTs) in the pores of a membrane can offer several advantages. A dispersion of CNTs in polyvinylidene fluoride was injected through a porous membrane, which immobilized the nanotubes in the pore structure. The CNTs served as a sorbent facilitating solute exchange between the two phases leading to enhancement of the enrichment factor by as much as 93%. The presence of CNTs also developed a diffusion barrier by sorbing solvent on its surface, which led to higher retention of the extractant within the membrane.

Reprint Address:
Mitra, S, New Jersey Inst Technol, Dept Chem & Environm Sci, Newark, NJ 07102 USA.

Research Institution addresses:
[Sae-Khow, Ornthida; Mitra, Somenath] New Jersey Inst Technol, Dept Chem & Environm Sci, Newark, NJ 07102 USA

E-mail Address:
Mitra@njit.edu

Cited References:
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BOWEN TC, 2007, J MEMBRANE SCI, V298, P117.
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Cited Reference Count:
30

Times Cited:
0

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

Subject Category:
Chemistry, Physical; Materials Science, Multidisciplinary

ISSN:
0959-9428

DOI:
10.1039/b822879e

IDS Number:
450OO

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Friday, June 5, 2009

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 OCT 2009
Number of Citing Articles: 1 new records this week (1 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Inside the chaperonin toolbox: theoretical and computational models for chaperonin mechanism

Authors:
Lucent, D; England, J; Pande, V

Author Full Names:
Lucent, Del; England, Jeremy; Pande, Vijay

Source:
PHYSICAL BIOLOGY 6 (1): Art. No. 015003 MAR 2009

Language:
English

Document Type:
Article

KeyWords Plus:
MOLECULAR CHAPERONES; HYDROPHOBIC FORCES; ESCHERICHIA-COLI; ELECTRIC CHARGES; NATIVE-STATE; GROEL-GROES; IN-VIVO; PROTEIN; CONFINEMENT; SIMULATIONS

Abstract:
Despite their immense importance to cellular function, the precise mechanism by which chaperonins aid in the folding of other proteins remains unknown. Experimental evidence seems to imply that there is some diversity in how chaperonins interact with their substrates and this has led to a number of different models for chaperonin mechanism. Computational methods have the advantage of accessing temporal and spatial resolutions that are difficult for experimental techniques; therefore, these methods have been applied to this problem for some time. Here we review the relevant computational models for chaperonin function. We propose that these models need not be mutually exclusive and in fact can be thought of as a set of tools the chaperonin may use to aid in the folding of a diverse array of substrate proteins. We conclude with a discussion of the role of water in the chaperonin mechanism, a factor that until recently has been largely neglected by most computational studies of!
chaperonin function.

Reprint Address:
Pande, V, James H Clark Ctr, 318 Campus Dr, Stanford, CA 94305 USA.

Research Institution addresses:
[England, Jeremy] Stanford Univ, Dept Phys, Stanford, CA 94305 USA; [Lucent, Del; Pande, Vijay] Stanford Univ, Biophys Program, Stanford, CA 94305 USA; [Pande, Vijay] Stanford Univ, Dept Chem, Stanford, CA 94305 USA; [Pande, Vijay] Dept Biol Struct, Stanford, CA USA

E-mail Address:
pande@stanford.edu

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Cited Reference Count:
61

Times Cited:
0

Publisher:
IOP PUBLISHING LTD; DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND

Subject Category:
Biophysics

ISSN:
1478-3967

DOI:
10.1088/1478-3975/6/1/015003

IDS Number:
446VE

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ISI Web of Knowledge Alert - Thompson, P

ISI Web of Knowledge Citation Alert
Cited Article:   Thompson, P. A general boundary condition for liquid flow at solid surfaces
Alert Expires:   21 OCT 2009
Number of Citing Articles:   2 new records this week (2 in this e-mail)
Organization ID:   3b97d1bbc1878baed0ab183d8b03130b

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Title: Nanocontraction flows of short-chain polyethylene via molecular dynamics simulations
Authors: Tseng, HC; Wu, JS; Chang, RY
Author Full Names: Tseng, Huan-Chang; Wu, Jiann-Shing; Chang, Rong-Yeu
Source: MOLECULAR SIMULATION 35 (8): 691-704 2009
Language: English
Document Type: Article
Author Keywords: nanocontraction flows; molecular dynamics simulations; Bio-MEMS; nanofluidics; polymer fluids
KeyWords Plus: N-HEXADECANE; LIQUID; SWELL; STATE; FILMS; SHEAR; DNA
Abstract: Nanocontraction flows of liquid short-chain polyethylene ([CH2]50) that were uniformly extruded by a constant-speed piston into a surrounding vacuum from a reservoir through an abrupt contraction nozzle were performed by employing molecular dynamics simulations. The extrudate exhibits a similar die swell phenomenon around the exit of the nozzle. In addition, numerous molecular chains are strongly adsorbed on the external surface of the nozzle. At high extrusion speeds, the velocity and temperature profiles in the nozzle show convex and concave parabolic curves, respectively, whereas the profiles are relatively flat at lower speeds. Near the internal boundary of the nozzle, the wall slip is inspected. Significantly, during the flow, the molecular chains undergo structural deformation, including compressed, stretched and shrunk motions. Comparisons with related experimental observations show that the simulated probability distributions of the bending and dihedral angles, and v! ariations of the squared radius of gyration and orientations, are in reasonable agreement.
Reprint Address: Wu, JS, Sci Bldg 2,1001 Ta Hsueh Rd, Hsinchu 30010, Taiwan.
Research Institution addresses: [Tseng, Huan-Chang; Wu, Jiann-Shing] Natl Chiao Tung Univ, Dept Appl Chem, Hsinchu, Taiwan; [Chang, Rong-Yeu] Natl Tsing Hua Univ, Dept Chem Engn, Hsinchu, Taiwan
E-mail Address: inblue.ac89g@nctu.edu.tw
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Cited Reference Count: 37
Times Cited: 1
Publisher: TAYLOR & FRANCIS LTD; 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND
Subject Category: Chemistry, Physical; Physics, Atomic, Molecular & Chemical
ISSN: 0892-7022
DOI: 10.1080/08927020802651613
IDS Number: 448FD

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Title: The interaction between water-insoluble pentosan and gluten of the whole wheat
Authors: Ma, FM; Wang, Z; Xu, SY; Lu, RR
Author Full Names: Ma, Fu-min; Wang, Zhang; Xu, Shi-ying; Lu, Rong-rong
Source: EUROPEAN FOOD RESEARCH AND TECHNOLOGY 229 (2): 231-238 JUN 2009
Language: English
Document Type: Article
Author Keywords: Water-insoluble pentosan; Gluten; Dynamic rheological properties; SEM; Force-distance curves
KeyWords Plus: UNEXTRACTABLE SOLIDS; DOUGH PROPERTIES; NEUTRAL SALTS; FLOUR PROTEIN; BREAD; ARABINOXYLANS; QUALITY; BRAN; POLYSACCHARIDES; BREADMAKING
Abstract: The water-insoluble pentosan (WIP) and gluten were extracted, and the interactions of WIP and gluten at different water level and ionic strength were measured by small amplitude oscillation tests and atomic force microscopy (AFM), and visualized by scanning electron micrographs (SEM). The results showed that the viscoelasticity of gluten and gluten-WIP mixtures greatly increased with the increase of water level, and decreased when water level was higher than 50%. The WIP significantly (p < 0.0001) improves viscoelasticity of gluten. The G' and GaEuro(3) of gluten and gluten-WIP mixtures were significantly (p < 0.0001) increased with the increase of NaCl concentration, and reached maximum when NaCl concentration was 4.0%. The SEM observations showed that the network of gluten-WIP mixtures was homogeneous and rather dense with a regular structure compared with that of gluten. From AFM detection, it was found that the single-molecule bond rupture force between the WIP and! gluten proteins was strengthened with the increase of NaCl concentration, which can partly explain the rheological property and microstructure changes of WIP-gluten mixtures.
Reprint Address: Wang, Z, Jiangnan Univ, Sch Food Sci & Technol, State Key Lab Food Sci & Technol, Wuxi 214122, Jiangsu, Peoples R China.
Research Institution addresses: [Ma, Fu-min; Wang, Zhang; Xu, Shi-ying; Lu, Rong-rong] Jiangnan Univ, Sch Food Sci & Technol, State Key Lab Food Sci & Technol, Wuxi 214122, Jiangsu, Peoples R China
E-mail Address: syxu2005@hotmail.com
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Times Cited: 0
Publisher: SPRINGER; 233 SPRING ST, NEW YORK, NY 10013 USA
Subject Category: Food Science & Technology
ISSN: 1438-2377
DOI: 10.1007/s00217-009-1041-0
IDS Number: 448KL

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ISI Web of Knowledge Alert - Holt JK

ISI Web of Knowledge Citation Alert

Cited Article: Holt JK. Fast mass transport through sub-2-nanometer carbon nanotubes
Alert Expires: 18 OCT 2009
Number of Citing Articles: 2 new records this week (2 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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VR 1.0

PT J
*Record 1 of 2.
L5 <http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS&DestLinkType=FullRecord;UT=000266283400011>
*Order Full Text [ ]
AU Lebert, M
Kaempgen, M
Soehn, M
Wirth, T
Roth, S
Nicoloso, N
AF Lebert, M.
Kaempgen, M.
Soehn, M.
Wirth, T.
Roth, S.
Nicoloso, N.
TI Fuel cell electrodes using carbon nanostructures
SO CATALYSIS TODAY
LA English
DT Proceedings Paper
DE Carbon nanotubes; Fuel cell; GDE; HT-PEMFC; PAFC; PEMFC; SWNT; MWNT
ID PARYLENE-N; NANOTUBES; ELECTROCATALYSTS
AB The use of carbon nanotubes (SWNT, MWNT, and aligned CNT) for low and
intermediate temperature fuel cells has been investigated with thin
film CNT/Pt-electrodes of(1<d<10 mu m). For membrane electrode assembly
(MEA) the electrodes were combined either with Nafion (R) 117 or
polycarbonate (PC) membranes wetted with H3PO4. The fuel cell
characteristics of the CNT-based MEAs were determined at atmospheric
pressure. different catalyst concentrations (Pt) and temperatures
(RT<T<150 degrees C). The performance is competitive to
well-established phosphoric acid (PAFCs) or polymer electrolyte
membrane fuel cell (PEMFC), e.g. PBI/H3PO4. Liquid state processing of
CNTs allows flexible electrode design and opens new ways for integrated
and significantly mass-/volume-reduced fuel cell electrodes with high
saving potential for catalyst and carbon material. Microsized high
performance power supplies and battery chargers for consumer
electronics are the most promising applications. (C) 2008 Elsevier B.V.
All rights reserved.
C1 [Lebert, M.; Roth, S.] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany.
[Kaempgen, M.] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA USA.
[Soehn, M.; Nicoloso, N.] Tech Univ Darmstadt, Dept Renewable Energies, D-64283 Darmstadt, Germany.
[Wirth, T.] Univ Cambridge, Dept Engn, Cambridge CB2 1PZ, England.
RP Lebert, M, Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany.
EM michael.lebert@daimler.com
CR *E TEK, 2003, GAS DIFF EL CAT ELAT
*US DOE, 2000, FUEL CELL HDB
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NR 23
TC 0
PU ELSEVIER SCIENCE BV; PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0920-5861
DI 10.1016/j.cattod.2008.10.043
PD MAY 15
VL 143
IS 1-2
BP 64
EP 68
SC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical
GA 448SX
UT ISI:000266283400011
ER

PT J
*Record 2 of 2.
L5 <http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS&DestLinkType=FullRecord;UT=000266180300001>
*Order Full Text [ ]
AU Belmonte, M
Gonzalez-Julian, J
Miranzo, P
Osendi, MI
AF Belmonte, Manuel
Gonzalez-Julian, Jesus
Miranzo, Pilar
Isabel Osendi, Maria
TI Continuous in situ functionally graded silicon nitride materials
SO ACTA MATERIALIA
LA English
DT Article
DE Functionally graded materials; Ceramics; Spark plasma sintering;
Hardness; Toughness
ID ELECTRIC-FIELD; MECHANICAL-PROPERTIES; CONTACT-DAMAGE; CERAMICS;
MICROSTRUCTURE; FABRICATION
AB Functionally graded materials can enhance the performance of components
under demanding operating conditions, although the development of
residual stresses across the gradient and scaling LIP the manufacturing
process to mass production present some limitations. To overcome these
problems, we present a one-step approach for processing continuous
functionally graded silicon nitride (Si3N4) materials from a sole
homogeneous powder composition, using spark plasma sintering as a
densification technique. Through the control of the temperature profile
within the compact, specimens with a continuous variation of alpha- and
beta-phase content, as well as grain size, were achieved. A continuous
gradation of mechanical properties, in particular, hardness and
toughness, were measured in these specimens. This approach offers
unprecedented opportunities to design custom-made Si3N4 components by
taking advantage of the particularities of field-assisted sintering
methods. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All
rights reserved.
C1 [Belmonte, Manuel; Gonzalez-Julian, Jesus; Miranzo, Pilar; Isabel Osendi, Maria] CSIC, Inst Ceram & Glass, E-28049 Madrid, Spain.
RP Belmonte, M, CSIC, Inst Ceram & Glass, Campus Cantoblanco,Kelsen 5,
E-28049 Madrid, Spain.
EM mbelmonte@icv.csic.es
CR 2001, 2001220247, JP
2006, 2006118033, JP
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10.1016/jeurceramsoc.2003.10.033
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NR 35
TC 0
PU PERGAMON-ELSEVIER SCIENCE LTD; THE BOULEVARD, LANGFORD LANE,
KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6454
DI 10.1016/j.actamat.2009.01.043
PD MAY
VL 57
IS 9
BP 2607
EP 2612
SC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering
GA 447GT
UT ISI:000266180300001
ER

EF

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or 734-459-8565.

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