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Membranes
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Niels Bohr Institute
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* Membranes
MEMBRANES
The Membrane Biophysics group at the Niels Bohr Institute focuses on theoretical
and experimental thermodynamics and spectroscopy of biological systems. We
investigate transitions in biomembranes, artificial lipid membranes and
proteins.
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ABOUT US
The Membrane Biophysics Group focuses on experimental and theoretical
thermodynamics applied to artificial and biological membranes, and on
neuroscience.
The Membrane Biophysics Group was founded in 1997 at the Max-Planck Institute
for Biophysical Chemistry in Göttingen/Germany. Its creation was part of a
Heisenberg Fellowship obtained by the principal investigator (Thomas Heimburg).
The group moved to the Niels Bohr Institute in Copenhagen in 2003.
* Financing in Germany came from the „Deutsche Forschungsgemeinschaft“, the
„Volkswagenstiftung“ and the „Max-Planck Society“.
* Funding sources in Denmark were the „Frie Forskningsråd“, the „Carlsberg
Foundation“, the „European Union“, the "University of Copenhagen
(Stjerneprogram)" and the "Velux Foundation“.
* Presently, the group profits from a major grant from the "Villum Foundation“.
Our main techniques are calorimetry, atomic force microscopy, electrophysiology,
and fluorescence correlation spectroscopy.
RESEARCH PROJECTS
The Membrane Biophysics Group focuses on theoretical and experimental
thermodynamics and spectroscopy of biological systems. We investigate
transitions in biomembranes, artificial lipid membranes and proteins.
Our main techniques are calorimetry, atomic force microscopy, densitometry,
Langmuir monolayers, black lipid membranes, standard electrophysiology and
different spectroscopic methods (fluorescence correlation spectroscopy, infrared
spectroscopy), single molecule fluorescence microscopy, as well as statistical
thermodynamics simulations.
In particular, we focus on the coupling of the elastic constants to the heat
capacity. Our most important present interest is the propagation of density
pulses in nerves, the role of anesthetics, and the occurrence of ion-channel-
like events in pure lipid membranes close to transitions that are due to thermal
fluctuations. We established a theory for the action potential that represents
them as electromechanical solitons. This approach naturally provides a theory
for anesthesia. We perform measurements on nerves in order to establish a
generic thermodynamic view of nerve pulses and channels.
We base our work on the theory of fluctuations. This implies that we do not base
our work on the function of single molecules but rather on the physics of
ensembles. Our major aim is to establish a self-contained view of the function
of biomembranes based on the fluctuation-dissipation theorem and the coupling of
the susceptibilities.
PUBLICATIONS
WILEY VCH (July 2007)
T. Heimburg: "Thermal Biophysics of Membranes"
Monographie, 330 pages, Hardcover
ISBN-10: 3-527-40471-6
ISBN-13: 978-3-527-40471-1 - Wiley-VCH, Berlin
From the Contents:
1. Membranes: An Introduction
2. Membrane Structure
3. The Composition of Biological Membranes
4. Introduction into thermodynamics
5. Water
6. Lipid Melting
7. Phase Diagrams
8. Statistical Models for Lipid Melting
9. Lipid-Protein Interactions
10. Diffusion
11. Electrostatics
12. Adsorptions, Binding and Insertion of Proteins
13. Elasticity and Curvature
14. Thermodynamics of the Elastic Constants
15. Structural Transitions
16. Relaxation Processes in Membranes
17. Permeability
18. Nerve Pulse Propagation
19. Anesthesia
PUBLICATIONS 2016 - TODAY :
107. arXiv-pdf abstract T. Muzic, F. Tounsi, S. B. Madsen, D. Pollakowski, M.
Konrad and T. Heimburg. 2019. Melting transitions in biomembranes Biochim.
Biophys. Acta, in print 106. pdf abstract T. Heimburg. 2019. Book chapter in:
Phase transitions in biological membranes “Thermodynamics and Biophysics of
Biomedical Nanosystems: Applications and Practical Considerations”. Editor:
Costas Demetzos. Springer-Nature. 105. pdf abstract K. L. Hoejholt, T. Muzic, S.
D. Jensen, M. Bilgin, J. Nylandsted, T. Heimburg, S. K. Frandsen, and J. Gehl.
2019. "Calcium electroporation and electrochemotherapy for cancer treatment:
Importance of cell membrane composition investigated by lipidomics, calorimetry
and in vitro efficacy" Scientific Reports 9: 4758. 104. pdf abstract H. S.
Thoke, L. F. Olsen, L. Duelund, R.P. Stock, T. Heimburg and L. A. Bagatolli.
2018. Is a constant low entropy process at the root of glycolytic oscillations?
J. Biol. Phys. 44: 419–431 103. pdf abstract T. Wang, T. Muzic, A. D. Jackson
and T. Heimburg. 2018. The free energy of biomembrane and nerve excitation and
the role of anesthetics. Biochim. Biophys. Acta 1860: 2145-2153.
arxiv.org/abs/1608.06093 102. pdf abstract T. Wang, A. Gonzalez-Perez, R.
Budvytyte, A. D. Jackson, and T. Heimburg. 2017. Reply to "Comment on
`Penetration of Action Potentials During Collision in the Median and Lateral
Giant Axons of Invertebrates' ". Phys. Rev. X 7: 028002. Supplementary
information: pdf 101. pdf abstract K. A. Zecchi, L. D. Mosgaard, and T.
Heimburg. 2017. Mechano-capacitive properties of polarized membranes and the
application to conductance measurements of lipid membrane patches. J. Phys:
Conf. Series 780: 012001 100. pdf abstract T. Heimburg. 2017. Linear
nonequilibrium thermodynamics of reversible periodic processes and chemical
oscillations Phys.Chem.Chem.Phys. 19: 17331-17341, arxiv.org/abs/1608.06093 99.
pdf abstract J. Peters, J. Marion, F. Becher, M. Trapp, T. Gutberlet, D. J.
Bicout, T. Heimburg. 2017. Thermodynamics of lipid large unilamellar vesicles in
presence of sterols at high hydrostatic pressure. Scientific Reports 7: 15339
98. pdf abstract K. Jensen, R. Budvytyte, R. A. Thomas, T. Wang, A. Fuchs, M. V.
Balabas, G. Vasilakis, L. Mosgaard, T. Heimburg, S.-P. Olesen, and E. S. Polzik.
2016. Non-invasive detection of animal nerve impulses with an atomic
magnetometer operating near quantum limited sensitivity. Scientific Reports 6:
29638. 97. pdf abstract A. Gonzalez-Perez, L. D. Mosgaard, R. Budvytyte, E.
Villagran-Vargas, A. D. Jackson, and T. Heimburg. 2016. Solitary
electromechanical pulses in Lobster neurons. Biophys. Chem. 216: 51-59
All publications here >>
PH.D. AND BACHELOR AND MASTER THESES
Bachelor theses
Master's theses
PhD theses
TEACHING AND COURSES
COURSE TITEL / WEB SITE: YEAR: BLOCK: LEVEL: ECTS: TIME/PLACE: → Introduction
into Biophysics 2021/22 1 BSc 7.5 skema C, place: Aud. D (lectures), Ma14
(exercises) Physics of biological nonequilibrium systems 2020/21 3 MSc 7.5
skema A,
place: online
PhD-School: Cross Institutional Molecular Biophysics 2022 3 MSc 7.5 various
locations
CONTACT
Thomas Heimburg, Professor and group leader (PGP-ID: 8222A560)
Blegdamsvej 17, 2100 København Ø.
Tel: +45 -3532 5389
FAX: +45-353 25016
Email: theimbu@nbi.ku.dk
STAFF
Name Title Phone E-mail Search in Name Search in Title Search in Phone Heimburg,
Thomas Rainer Professor +4535325389 E-mail
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Niels Bohr Institute
University of Copenhagen
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