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Reilly T, Mohamed MI, Lehmann TE, Alvarado V. Amphiphilic second-order phase transitions determined through NMR. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.07.066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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2
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Masters TA, Marsh RJ, Blacker TS, Armoogum DA, Larijani B, Bain AJ. Polarized two-photon photoselection in EGFP: Theory and experiment. J Chem Phys 2018; 148:134311. [PMID: 29626864 DOI: 10.1063/1.5011642] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
In this work, we present a complete theoretical description of the excited state order created by two-photon photoselection from an isotropic ground state; this encompasses both the conventionally measured quadrupolar (K = 2) and the "hidden" degree of hexadecapolar (K = 4) transition dipole alignment, their dependence on the two-photon transition tensor and emission transition dipole moment orientation. Linearly and circularly polarized two-photon absorption (TPA) and time-resolved single- and two-photon fluorescence anisotropy measurements are used to determine the structure of the transition tensor in the deprotonated form of enhanced green fluorescent protein. For excitation wavelengths between 800 nm and 900 nm, TPA is best described by a single element, almost completely diagonal, two-dimensional (planar) transition tensor whose principal axis is collinear to that of the single-photon S0 → S1 transition moment. These observations are in accordance with assignments of the near-infrared two-photon absorption band in fluorescent proteins to a vibronically enhanced S0 → S1 transition.
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Affiliation(s)
- T A Masters
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - R J Marsh
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - T S Blacker
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - D A Armoogum
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - B Larijani
- Cell Biophysics Laboratory, Ikerbasque, Basque Foundation for Science and Unidad de Biofisica (CSIC-UPV/EHU), Bilbao, Spain
| | - A J Bain
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
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Masters TA, Robinson NA, Marsh RJ, Blacker TS, Armoogum DA, Larijani B, Bain AJ. Time-resolved stimulated emission depletion and energy transfer dynamics in two-photon excited EGFP. J Chem Phys 2018; 148:134312. [DOI: 10.1063/1.5011643] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- T. A. Masters
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
- CoMPLEX, University College London, London WC1E 6BT, United Kingdom
| | - N. A. Robinson
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - R. J. Marsh
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - T. S. Blacker
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
- CoMPLEX, University College London, London WC1E 6BT, United Kingdom
| | - D. A. Armoogum
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - B. Larijani
- Cell Biophysics Laboratory, Ikerbasque, Basque Foundation for Science and Unidad de Biofisica (CSIC-UPV/EHU), Bilbao, Spain
| | - A. J. Bain
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
- CoMPLEX, University College London, London WC1E 6BT, United Kingdom
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Buczkowski M, Budziński MP, Fisz JJ. Bayesian approach to inverse problem in the case of time-resolved polarized fluorescence investigation of microscopically ordered systems. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.05.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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5
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Liu Q, Beier C, Evans J, Lee T, He S, Smalyukh II. Self-alignment of dye molecules in micelles and lamellae for three-dimensional imaging of lyotropic liquid crystals. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:7446-7452. [PMID: 21598933 DOI: 10.1021/la200842z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We report alignment of anisotropic amphiphilic dye molecules within oblate and prolate anisotropic micelles and lamellae, the basic building blocks of surfactant-based lyotropic liquid crystals. Absorption and fluorescence transition dipole moments of these dye molecules orient either parallel or orthogonal to the liquid crystal director. This alignment enables three-dimensional visualization of director structures and defects in different lyotropic mesophases by means of fluorescence confocal polarizing microscopy and two-photon excitation fluorescence polarizing microscopy. The studied structures include nematic tactoids, Schlieren texture with disclinations in the calamitic nematic phase, oily streaks in the lamellar phase, developable domains in the columnar hexagonal phase, and various types of line defects in the discotic cholesteric phase. Orientational three-dimensional imaging of structures in the lyotropic cholesterics reveals large Burgers vector dislocations in cholesteric layering with singular disclinations in the dislocation cores that are not common for their thermotropic counterparts.
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Affiliation(s)
- Qingkun Liu
- Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
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Theisen M, Linke M, Kerbs M, Fidder H, Madjet MEA, Zacarias A, Heyne K. Femtosecond polarization resolved spectroscopy: A tool for determination of the three-dimensional orientation of electronic transition dipole moments and identification of configurational isomers. J Chem Phys 2009; 131:124511. [DOI: 10.1063/1.3236804] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Yan D, Lu J, Wei M, Ma J, Evans DG, Duan X. A combined study based on experiment and molecular dynamics: perylene tetracarboxylate intercalated in a layered double hydroxide matrix. Phys Chem Chem Phys 2009; 11:9200-9. [DOI: 10.1039/b907366c] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Baumgart T, Hunt G, Farkas ER, Webb WW, Feigenson GW. Fluorescence probe partitioning between Lo/Ld phases in lipid membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2007; 1768:2182-94. [PMID: 17588529 PMCID: PMC2702987 DOI: 10.1016/j.bbamem.2007.05.012] [Citation(s) in RCA: 376] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2006] [Revised: 05/03/2007] [Accepted: 05/11/2007] [Indexed: 01/28/2023]
Abstract
Fluorescence microscopy imaging is an important technique for studying lipid membranes and is increasingly being used for examining lipid bilayer membranes, especially those showing macroscopic coexisting domains. Lipid phase coexistence is a phenomenon of potential biological significance. The identification of lipid membrane heterogeneity by fluorescence microscopy relies on membrane markers with well-defined partitioning behavior. While the partitioning of fluorophores between gel and liquid-disordered phases has been extensively characterized, the same is not true for coexisting liquid phases. We have used fluorescence microscopy imaging to examine a large variety of lipid membrane markers for their liquid phase partitioning in membranes with various lipid compositions. Most fluorescent lipid analogs are found to partition strongly into the liquid-disordered (L(d)) phase. In contrast, some fluorescent polycyclic aromatic hydrocarbons with a flat ring system were found to partition equally, but others partition preferentially into liquid-ordered (L(o)) phases. We have found these fluorescent markers effective for identification of coexisting macroscopic membrane phases in ternary lipid systems composed of phospholipids and cholesterol.
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Affiliation(s)
- Tobias Baumgart
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, 14853
| | - Geoff Hunt
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY, 14853
| | - Elaine R. Farkas
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, 14853
| | - Watt W. Webb
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, 14853
- Corresponding Author: Watt W. Webb, 212 Clark Hall, Cornell University, Ithaca, NY, 14853-2501, Phone: (607) 255-3331, Fax: (607) 255-7658, email
| | - Gerald W. Feigenson
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY, 14853
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Runge AF, Saavedra SS, Mendes SB. Combination of Polarized TIRF and ATR Spectroscopies for Determination of the Second and Fourth Order Parameters of Molecular Orientation in Thin Films and Construction of an Orientation Distribution Based on the Maximum Entropy Method. J Phys Chem B 2006; 110:6721-31. [PMID: 16570978 DOI: 10.1021/jp056048m] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This article describes two mathematical formalisms for the determination of the second and fourth order parameters of molecular films using optical spectroscopy. Method A uses polarized total internal reflection fluorescence (TIRF) to calculate the second and fourth order parameters, {P2(cos theta)} and {P4(cos theta)}, using an independently determined value for the angle between the absorption and emission dipoles, gamma. Method B uses {P2(cos theta)} obtained from attenuated total reflectance (ATR) data, along with polarized TIRF measurements to calculate {P4(cos theta)} and {cos2 gamma}. The choice of a specific method should rely on experimental considerations. We also present a method to separate the contributions of substrate surface roughness and dipole orientation with respect to the molecular axis from the spectroscopically determined second and fourth order parameters. Finally, a maximum entropy approach for construction of an orientation distribution from order parameters is compared with the commonly used delta and Gaussian distributions.
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Affiliation(s)
- Anne F Runge
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721, USA
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Michel N, Fabiano AS, Polidori A, Jack R, Pucci B. Determination of phase transition temperatures of lipids by light scattering. Chem Phys Lipids 2006; 139:11-9. [PMID: 16253216 DOI: 10.1016/j.chemphyslip.2005.09.003] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2005] [Revised: 09/05/2005] [Accepted: 09/16/2005] [Indexed: 11/29/2022]
Abstract
Various techniques have been proposed to specify the phase transition temperatures of surfactant molecules. The work reported herein deals with a new general method of T(c) determination based on the optical properties' modifications of aqueous surfactant solutions when the phase transitions occur in the phospholipid membrane. The shape alteration of supramolecular systems induced by the phase transition was correlated with the refraction and absorption coefficients of their aqueous dispersion. The mean count rate (average number of photons detected per second) measured with a Zetasizer Nano-S model ZEN1600 Dynamic Light Scattering Instrument, is representative of an emerging macroscopic phenomenon, but not directly size dependent and has been adapted to our expectations. Changes in the measured scattering intensity reflect changes in the optical properties of the material during temperature variations. Thus, this method allowed to specify the phase transition temperature of many natural or synthetic surfactants independently of their polar head or hydrophobic part.
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Affiliation(s)
- Nicolas Michel
- Laboratoire de Chimie Bioorganique et des Systèmes Moléculaires Vectoriels, Faculté des Sciences, 33 Rue Louis Pasteur, 84000 Avignon, France
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11
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Xu J, Shen X, Knutson JR. Femtosecond Fluorescence Upconversion Study of the Rotations of Perylene and Tetracene in Hexadecane. J Phys Chem A 2003. [DOI: 10.1021/jp030113f] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jianhua Xu
- Optical Spectroscopy Section, Laboratory of Biophysical Chemistry, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892-1412
| | - Xiaohua Shen
- Optical Spectroscopy Section, Laboratory of Biophysical Chemistry, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892-1412
| | - Jay R. Knutson
- Optical Spectroscopy Section, Laboratory of Biophysical Chemistry, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892-1412
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12
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Higgins DA, Liao X, Hall JE, Mei E. Simultaneous Near-Field Optical Birefringence and Fluorescence Contrast Applied to the Study of Dye-Doped Polymer-Dispersed Liquid Crystals. J Phys Chem B 2001. [DOI: 10.1021/jp010415m] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daniel A. Higgins
- Department of Chemistry, Kansas State University, Manhattan, KS, 66506
| | - Xiangmin Liao
- Department of Chemistry, Kansas State University, Manhattan, KS, 66506
| | - Jeffrey E. Hall
- Department of Chemistry, Kansas State University, Manhattan, KS, 66506
| | - Erwen Mei
- Department of Chemistry, Kansas State University, Manhattan, KS, 66506
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13
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Shobini J, Mishra AK. Effect of leucinyl-phenylalanyl-valine on DMPC liposome membrane. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2000; 56A:2239-2248. [PMID: 11058069 DOI: 10.1016/s1386-1425(00)00308-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Leucinyl-phenylalanyl-valine (LFV) is a hydrophobic tripeptide with a flat egg shaped structure with the long axis dimension of about 12 A. The effect of LFV on dimyristoylphosphatidylcholine (DMPC) liposome membrane has been studied by differential scanning calorimetry (DSC) and fluorescence spectroscopy. Calorimetric studies shows that incorporation of LFV completely abolishes the pretransition temperature with broadening of main transition temperature. Four conceptually different fluorescence probes, 1-naphthol (1-ROH) an excited state proton transfer probe, 8-anilino-1-naphthalenesulphonate (ANS) a solvent polarity probe, 1-6-diphenylhexatriene (DPH) an anisotropy probe and pyrene an excimer-forming probe have been used for fluorescence spectroscopic studies. For 1-ROH, ANS and DPH, a decreased partitioning with increasing mol.% of LFV was observed. Increasing LFV mol.% caused a decrease in the neutral form emission of 1-ROH, and a decrease in fluorescence intensity with red shift in ANS. The excimer formation ability of pyrene also decreased. The phase transition behavior of DMPC membrane in the presence of LFV was similar to the known effect of cholesterol on lipid bilayers. These results suggest that LFV cause an increased compactness of membrane.
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Affiliation(s)
- J Shobini
- Department of Chemistry, Indian Institute of Technology, Madras, Chennai
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Pemberton JE, Chamberlain JR. Raman spectroscopy of model membrane monolayers of dipalmitoylphosphatidic acid at the air-water interface using surface enhancement from buoyant thin silver films. Biopolymers 2000; 57:103-16. [PMID: 10766961 DOI: 10.1002/(sici)1097-0282(2000)57:2<103::aid-bip7>3.0.co;2-t] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A novel method for the acquisition of surface enhanced Raman (SER) spectra of model membranes of dipalmitoylphosphatidic acid (DPPA) in Langmuir layers at the air-water interface is reported. The approach is based on the electrochemical formation of a buoyant thin layer of coalesced silver colloids in the vicinity of the phosphatidic acid head groups at the interface. This Ag layer is an excellent platform for SER scattering, which shows the spectral features from all parts of the molecule and water between the Ag surface and the DPPA layer. The observation of the spectral response from the phosphatidic acid head groups is of particular significance, allowing insight into their chemical state and orientation at the air-water interface.
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Affiliation(s)
- J E Pemberton
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721, USA.
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15
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Krishna MM, Periasamy N. Location and orientation of DODCI in lipid bilayer membranes: effects of lipid chain length and unsaturation. BIOCHIMICA ET BIOPHYSICA ACTA 1999; 1461:58-68. [PMID: 10556488 DOI: 10.1016/s0005-2736(99)00149-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The location and orientation of a linear dye molecule, DODCI, in lipid bilayer membrane were determined by the effect of viscosity and refractive index of the aqueous medium on the fluorescence properties of the dye bound to the membrane. The membrane-bound dye is solubilized in two sites, one near the surface (short fluorescence lifetime) and another in the interior of the membrane (long lifetime). The ratio of the dye in the two locations and the orientation of the dye (parallel or perpendicular to the membrane) are sensitive to the lipid chain length and unsaturation in the alkyl chain. The fraction of the dye in the interior region is higher for short alkyl chains (C12>C14>C16>>C18C20) and in unsaturated lipids (C14:1>C14:0, C16:1>C16:0). These experimental results are consistent with the general principle that the penetration of an amphiphilic organic molecule in the interior region of the membrane is more when the structure of th bilayer is more fluid-like.
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Affiliation(s)
- M M Krishna
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai, India
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16
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Daniel SN, Niemeyer ED, Bright FV. Evidence for Chain Length Dependent Local Ordering Surrounding Perylene Dissolved in Poly(ethylene glycol). Macromolecules 1999. [DOI: 10.1021/ma990674y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sheila N. Daniel
- Department of Chemistry, Natural Sciences Complex, State University of New York at Buffalo, Buffalo, New York 14260-3000
| | - Emily D. Niemeyer
- Department of Chemistry, Natural Sciences Complex, State University of New York at Buffalo, Buffalo, New York 14260-3000
| | - Frank V. Bright
- Department of Chemistry, Natural Sciences Complex, State University of New York at Buffalo, Buffalo, New York 14260-3000
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18
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Verhagen JCD, van Zandvoort MAMJ, Vroom JM, Johansson LBÅ, van Ginkel G. Spectroscopic Properties of 2,5,8,11-Tetra-tert-butylperylene in Polymer Films. J Phys Chem B 1997. [DOI: 10.1021/jp972179e] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. C. D. Verhagen
- Department of Molecular Biophysics, Debeye Institute, Buys Ballot Laboratory, Utrecht University, P.O. Box 80000, 3508 TA Utrecht, The Netherlands, and Department of Physical Chemistry, University of Umeå, S-90187 Umeå, Sweden
| | - M. A. M. J. van Zandvoort
- Department of Molecular Biophysics, Debeye Institute, Buys Ballot Laboratory, Utrecht University, P.O. Box 80000, 3508 TA Utrecht, The Netherlands, and Department of Physical Chemistry, University of Umeå, S-90187 Umeå, Sweden
| | - J. M. Vroom
- Department of Molecular Biophysics, Debeye Institute, Buys Ballot Laboratory, Utrecht University, P.O. Box 80000, 3508 TA Utrecht, The Netherlands, and Department of Physical Chemistry, University of Umeå, S-90187 Umeå, Sweden
| | - L. B-Å. Johansson
- Department of Molecular Biophysics, Debeye Institute, Buys Ballot Laboratory, Utrecht University, P.O. Box 80000, 3508 TA Utrecht, The Netherlands, and Department of Physical Chemistry, University of Umeå, S-90187 Umeå, Sweden
| | - G. van Ginkel
- Department of Molecular Biophysics, Debeye Institute, Buys Ballot Laboratory, Utrecht University, P.O. Box 80000, 3508 TA Utrecht, The Netherlands, and Department of Physical Chemistry, University of Umeå, S-90187 Umeå, Sweden
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van Zandvoort MAMJ, Gerritsen HC, Levine YK. Distribution of Hydrophobic Probe Molecules in Lipid Bilayers. 1. Monte Carlo Dynamics Computer Simulations. J Phys Chem B 1997. [DOI: 10.1021/jp963414g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M. A. M. J. van Zandvoort
- Department of Molecular Biophysics, Debye Institute, Buys Ballot Laboratory, Utrecht University, P.O. Box 80.000, 3508 TA, Utrecht, The Netherlands
| | - H. C. Gerritsen
- Department of Molecular Biophysics, Debye Institute, Buys Ballot Laboratory, Utrecht University, P.O. Box 80.000, 3508 TA, Utrecht, The Netherlands
| | - Y. K. Levine
- Department of Molecular Biophysics, Debye Institute, Buys Ballot Laboratory, Utrecht University, P.O. Box 80.000, 3508 TA, Utrecht, The Netherlands
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