Friday, December 17, 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
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Title:
The structural basis of function in Cys-loop receptors

Authors:
Thompson, AJ; Lester, HA; Lummis, SCR

Author Full Names:
Thompson, Andrew J.; Lester, Henry A.; Lummis, Sarah C. R.

Source:
QUARTERLY REVIEWS OF BIOPHYSICS 43 (4): 449-499 NOV 2010

Language:
English

Document Type:
Review

KeyWords Plus:
NICOTINIC ACETYLCHOLINE-RECEPTOR; GATED ION CHANNELS; PROTEIN-KINASE-C; BENZODIAZEPINE BINDING-SITE; AMINOBUTYRIC ACID(A) RECEPTORS; RECOMBINANT 5-HT3 RECEPTOR; CATION-PI INTERACTIONS; POSITIVE ALLOSTERIC MODULATION; MAJOR INTRACELLULAR DOMAINS; MEMBRANE-SPANNING SEGMENT

Abstract:
Cys-loop receptors are membrane-spanning neurotransmitter-gated ion channels that are responsible for fast excitatory and inhibitory transmission in the peripheral and central nervous systems. The best studied members of the Cys-loop family are nACh, 5-HT3, GABA(A) and glycine receptors. All these receptors share a common structure of five subunits, pseudo-symmetrically arranged to form a rosette with a central ion-conducting pore. Some are cation selective (e.g. nACh and 5-HT3) and some are anion selective (e.g. GABA(A) and glycine). Each receptor has an extracellular domain (ECD) that contains the ligand-binding sites, a transmembrane domain (TMD) that allows ions to pass across the membrane, and an intracellular domain (ICD) that plays a role in channel conductance and receptor modulation. Cys-loop receptors are the targets for many currently used clinically relevant drugs (e.g. benzodiazepines and anaesthetics). Understanding the molecular mechanisms of these receptors co
uld therefore provide the catalyst for further development in this field, as well as promoting the development of experimental techniques for other areas of neuroscience. In this review, we present our current understanding of Cys-loop receptor structure and function. The ECD has been extensively studied. Research in this area has been stimulated in recent years by the publication of high-resolution structures of nACh receptors and related proteins, which have permitted the creation of many Cys loop receptor homology models of this region. Here, using the 5-HT3 receptor as a typical member of the family, we describe how homology modelling and ligand docking can provide useful but not definitive information about ligand interactions. We briefly consider some of the many Cys-loop receptors modulators. We discuss the current understanding of the structure of the TMD, and how this links to the ECD to allow channel gating, and consider the roles of the ICD, whose structure is poo
rly understood. We also describe some of the current methods!
that ar
e beginning to reveal the differences between different receptor states, and may ultimately show structural details of transitions between them.

Reprint Address:
Lummis, SCR, Univ Cambridge, Dept Biochem, Bldg O,Downing Site, Cambridge CB2 1QW, England.

Research Institution addresses:
[Thompson, Andrew J.; Lummis, Sarah C. R.] Univ Cambridge, Dept Biochem, Cambridge CB2 1QW, England; [Lester, Henry A.] CALTECH, Pasadena, CA 91125 USA

E-mail Address:
sl120@cam.ac.uk

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Cited Reference Count:
398

Times Cited:
0

Publisher:
CAMBRIDGE UNIV PRESS; 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA

Subject Category:
Biophysics

ISSN:
0033-5835

DOI:
10.1017/S0033583510000168

IDS Number:
686PA

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

*Record 2 of 5.
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Title:
Single-file water as a one-dimensional Ising model

Authors:
Kofinger, J; Dellago, C

Author Full Names:
Koefinger, Juergen; Dellago, Christoph

Source:
NEW JOURNAL OF PHYSICS 12: Art. No. 093044 SEP 27 2010

Language:
English

Document Type:
Article

KeyWords Plus:
CARBON NANOTUBE MEMBRANES; ICE-NANOTUBES; ORDERED WATER; CONDUCTION; PERMEATION; TRANSPORT; CHANNEL; PORES

Abstract:
We show that single-file water in nanopores can be viewed as a one-dimensional (1D) Ising model, and we investigate, on the basis of this, the static dielectric response of a chain of hydrogen-bonded water molecules to an external field. To achieve this, we use a recently developed dipole lattice model that accurately captures the free energetics of nanopore water. In this model, the total energy of the system can be expressed as the sum of the effective interactions of chain ends and orientational defects. Neglecting these interactions, we essentially obtain the 1D Ising model, which allows us to derive analytical expressions for the free energy as a function of the total dipole moment and for the dielectric susceptibility. Our expressions, which agree very well with simulation results, provide the basis for the interpretation of future dielectric spectroscopy experiments on water-filled nanopore membranes.

Reprint Address:
Kofinger, J, NIDDKD, Chem Phys Lab, NIH, Bldg 5, Bethesda, MD 20892 USA.

Research Institution addresses:
[Koefinger, Juergen] NIDDKD, Chem Phys Lab, NIH, Bethesda, MD 20892 USA; [Dellago, Christoph] Univ Vienna, Fac Phys, A-1090 Vienna, Austria

E-mail Address:
koefingerj@mail.nih.gov

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Cited Reference Count:
35

Times Cited:
1

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

Subject Category:
Physics, Multidisciplinary

ISSN:
1367-2630

DOI:
10.1088/1367-2630/12/9/093044

IDS Number:
687FV

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

*Record 3 of 5.
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Title:
Solvation dynamics of Coumarin 153 in SDS dispersed single walled carbon nanotubes (SWNTs)

Authors:
Sengupta, A; Hazra, P

Author Full Names:
Sengupta, Abhigyan; Hazra, Partha

Source:
CHEMICAL PHYSICS LETTERS 501 (1-3): 33-38 DEC 6 2010

Language:
English

Document Type:
Article

KeyWords Plus:
ANGLE NEUTRON-SCATTERING; ICE-NANOTUBES; LIQUID WATER; MICELLES; SURFACTANTS; SHELL

Abstract:
We have studied the solvation dynamics and rotational relaxation of Coumarin 153 (C-153) in SDS dispersed two different types of single walled carbon nanotubes (SWNTs), namely metallic and semiconducting, using picosecond fluorescence spectroscopy. It has been observed that solvation dynamics of C-153 in SWNTs is severely retarded compared to pure water and SDS micelle. Time resolved fluorescence anisotropy study suggests that C-153 molecules are located on the surface of SWNT, where the rotational motion of the probe is severely hindered compared to SDS micelle due to the restriction imposed by SWNT surface as well as surrounding SDS monomers or SDS half-cylindrical micelles adsorbed on SWNT surface. (C) 2010 Elsevier B. V. All rights reserved.

Reprint Address:
Hazra, P, Indian Inst Sci Educ & Res, Dept Chem, Pune 411021, Maharashtra, India.

Research Institution addresses:
[Sengupta, Abhigyan; Hazra, Partha] Indian Inst Sci Educ & Res, Dept Chem, Pune 411021, Maharashtra, India

E-mail Address:
p.hazra@iiserpune.ac.in

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Cited Reference Count:
31

Times Cited:
0

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

Subject Category:
Chemistry, Physical; Physics, Atomic, Molecular & Chemical

ISSN:
0009-2614

DOI:
10.1016/j.cplett.2010.10.049

IDS Number:
686HZ

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

*Record 4 of 5.
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Title:
Self-Assembly and Its Impact on Interfacial Charge Transfer in Carbon Nanotube/P3HT Solar Cells

Authors:
Bernardi, M; Giulianini, M; Grossman, JC

Author Full Names:
Bernardi, Marco; Giulianini, Michele; Grossman, Jeffrey C.

Source:
ACS NANO 4 (11): 6599-6606 NOV 2010

Language:
English

Document Type:
Article

Author Keywords:
self assembly; organic photovoltaics; excitonic solar cells; bulk heterojunction; P3HT; conjugation length; carbon nanotube; molecular dynamics; charge transfer

KeyWords Plus:
MOLECULAR-DYNAMICS; FORCE-FIELD; COMPOSITES; MORPHOLOGY; PROGRESS; SYSTEMS

Abstract:
Charge transfer at the interface of conjugated polymer and nanoscale inorganic acceptors is pivotal in determining the efficiency of exatonic solar cells. Despite intense efforts carbon nanotube/polymer solar cells have resulted in disappointing efficiencies (<2%) due in large part to poor charge transfer at the interface. While the interfacial energy level alignment is clearly important, the self assembly and the interface structure also play a major role in facilitating this charge transfer To understand and control this effect to our advantage, we Study the interface of commonly used conductive polymer poly 3 hexylthiophene (P3HT) and single-walled carbon nanotubes (SWNTs) with a combination of Molecular dynamics simulations, absorption spectra experiments, and an analysis of charge transfer effects classical molecular dynamics simulations show that the P3HT wraps around the SWNTs In a number different conformations, including helices, bundles, and more elongated conformat
ions that maximize planar pi-pi stacking, in agreement with recent experimental observations. Snapshots from the MD simulations reveal that the carbo nanotubes play an important templating role of increasing the pi conjugation in the system, an effect deriving from the pi-pi stacking interaction at the interface and the 1 dimensional (1D) nature of the SWNTs, and independent of the SWNT chirality. We show how this increase in the system for improved preparation of polymeric solar cells based on carbon nanotubes and on 1D system conjugation could largely improve the charge transfer in P3HT-SWNT type II heterojunctions support our our results with absorption spectra measurements of mixtures of carbon nanotubes and P3HT. These findings nanomaterials in general

Reprint Address:
Grossman, JC, MIT, Dept Mat Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA.

Research Institution addresses:
[Bernardi, Marco; Grossman, Jeffrey C.] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA; [Giulianini, Michele] Queensland Univ Technol, Sch Engn Syst, Brisbane, Qld 4001, Australia

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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/nn1018297

IDS Number:
682YD

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Title:
High-Performance Separation of Nanoparticles with Ultrathin Porous Nanocrystalline Silicon Membranes

Authors:
Gaborski, TR; Snyder, JL; Striemer, CC; Fang, DZ; Hoffman, M; Fauchet, PM; McGrath, JL

Author Full Names:
Gaborski, Thomas R.; Snyder, Jessica L.; Striemer, Christopher C.; Fang, David Z.; Hoffman, Michael; Fauchet, Philippe M.; McGrath, James L.

Source:
ACS NANO 4 (11): 6973-6981 NOV 2010

Language:
English

Document Type:
Article

Author Keywords:
purification; thin film; semiconductor; microfluidics; nanofluidics

KeyWords Plus:
CARBON NANOTUBE MEMBRANES; ANION-EXCHANGE MEMBRANES; ULTRAFILTRATION MEMBRANES; ANGSTROM RESOLUTION; CRYSTAL-STRUCTURE; PLASMID DNA; FILTRATION; TRANSPORT; WATER; FLOW

Abstract:
Porous nanocystalline silicon (pnc Si) is a 15 nm thin free standing membrane material with Applications in small scale separations, biosensors, cell culture, and lab-on a-chip devices Pnc Si has already been shown to exhibit high permeability to diffusing species and selectivity based on molecular size or charge. In this report, we characterize properties of pc Si In pressurized flows We compare results to long standing theories for through short pores using actual pore distributions kilned directly from electron micrographs The measured water permeability is in agreement with theory over a wide range of pore sizes and porosities and orders of magnitude higher than those exhibited by commercial ultrafiltration and experimental carbon nanotube membranes We also show that pnc Si membranes can be used in dead end filtration to,fractionate gold nanoparticles and protein size ladders with better than 5 nm resolution, insignificant sample loss, and little dilution of the filtrate
These performance characteristics, combined with scalable manufacturing, make pnc Si filtration a straightforward solution to many nanoparticle and biological separation problems

Reprint Address:
McGrath, JL, Univ Rochester, Dept Biomed Engn, 601 Elmwood Ave, Rochester, NY 14627 USA.

Research Institution addresses:
[Gaborski, Thomas R.; Hoffman, Michael; McGrath, James L.] Univ Rochester, Dept Biomed Engn, Rochester, NY 14627 USA; [Snyder, Jessica L.] Univ Rochester, Dept Biochem & Biophys, Rochester, NY 14627 USA; [Gaborski, Thomas R.; Striemer, Christopher C.] SiMPore Inc, W Henrietta, NY 14586 USA; [Striemer, Christopher C.; Fang, David Z.; Fauchet, Philippe M.] Univ Rochester, Dept Elect & Comp Engn, Rochester, NY 14627 USA

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Cited Reference Count:
43

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/nn102064c

IDS Number:
682YD

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