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Monday, April 27, 2020 | History

2 edition of Structural phase transitions in crystalline models of lipid bilayers found in the catalog.

Structural phase transitions in crystalline models of lipid bilayers

Gregory Frank Needham

Structural phase transitions in crystalline models of lipid bilayers

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  • 40 Currently reading

Published .
Written in English

    Subjects:
  • Bilayer lipid membranes.,
  • Lipids.

  • Edition Notes

    Statementby Gregory Frank Needham.
    The Physical Object
    Paginationxii, 194 leaves :
    Number of Pages194
    ID Numbers
    Open LibraryOL16502212M

    “Domains, cushioning, and patterning of bilayers by surface interactions with solid substrates and their sensing properties”, Ruxandra Vidu, Timothy V. Ratto, Marjorie L. Longo and Pieter Stroeve, Invited Book Chapter, in Planar Lipid Bilayers (BLMs) and Their Applications, editors, H. T. Tien and A. Ottava-Leitmannova, Elsevier Science, We review recent developments in the rapidly growing field of membrane biophysics, with a focus on the structural properties of single lipid bilayers determined by different scattering techniques, namely neutron and X-ray scattering. The need for accurate lipid structural properties is emphasized by the sometimes conflicting results found in the literature, even in the case of the most studied Cited by:


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Structural phase transitions in crystalline models of lipid bilayers by Gregory Frank Needham Download PDF EPUB FB2

Lipids, Phase Transitions of Ta b l e 3 Examples of heating, cooling, and isother mal phase sequences in lipid dispersions (44) Lipid Scan direction Phase sequence. The structural phase transitions in perovskite compounds were revived in the past decade by the emergence of a large number of perovskite compounds based on diatomic or multiatomic bridges, e.g Author: Minoru Fujimoto.

The phase behavior of lipid bilayers is largely determined by the strength of the attractive Van der Waals interactions between adjacent lipid molecules. The extent of this interaction is in turn governed by how long the lipid tails are and how well they can pack together.

Longer tailed lipids have more area over which to interact, increasing the strength of this interaction and consequently. The L β to L α chain-melting phase transition of hydrated lipid bilayers results in large decreases in molecular order and large increases in the dynamics and conformational freedom of these lipid assemblies.

If the hydrocarbon chain-melting process proceeds from a more ordered lamellar crystalline (L c) phase to the L α phase, or from an L β phase to a slightly more disordered liquid Cited by: Lipid bilayer is a universal component of all cell membranes.

The structure is called a "lipid bilayer" because it composed of two layers of fatty acids organized in two sheets.

The lipid bilayer is typically about five nanometers to ten nanometers thick and surrounds. The complex structural dynamics of the bilayers are governed by temperature-dependent parameters such as average interfacial area per lipid, thickness of bilayer, and disorder of hydrophobic tails.

The SPB can exist in several lamellar phases: gel phase; liquid crystalline or fluid phase; subgel phase; and ripple phase (Tenchov et al., ).Cited by:   The role of lipid domain size and protein-lipid interfaces in the thermotropic phase transition of dipalmitoyl phosphatidylcholine (DPPC) and dimyristoyl phosphatidylcholine (DMPC) bilayers in Nanodiscs was studied using small-angle X-ray scattering (SAXS), differential scanning calorimetry (DSC), and generalized polarization (GP) of the lipophilic probe by: A model lipid bilayer is any bilayer assembled in vitro, as opposed to the bilayer of natural cell membranes or covering various sub-cellular structures like the are used to study the fundamental properties of biological membranes in a simplified and well-controlled environment, and increasingly in bottom-up synthetic biology for the construction of artificial cells.

We wish to present an order-disorder model for the observed phase transitions in lipid bilayers and biological membranes. We show that the model may, under certain circumstances, exhibit two phase transitions, one corresponding to positional disordering of entire lipid molecules, and the other corresponding to orientational disordering in the hydrocarbon by: ¾first proposed by S.J.

Singer () as a lipid protein model ¾and extended to include the fluid character in a publication with G.L. Nicolson in "Science" ()File Size: 2MB. The database on structural phase transitions is presented in the simple and easy accessible form of table. The symmetry changes and temperature for phase transitions and the references for each of registered crystalline materials with well defined stoichoimetry are the main data in this by: Trauble H, Sackmann E.

Studies of crystalline-liquid crystalline phase transition of lipid model membranes 3 structure of a steroid-lecithin system below and above lipid phase transition.

J Am Chem Soc. ;–8. Phase transitions in lipid bilayers Wladimir A. Benalcazar Abstract Despite the simplicity in their structure, lipid bilayers can ar-range in a rich Structural phase transitions in crystalline models of lipid bilayers book of phases, including rippled phases that exhibit supramolecular periodic structures.

A number of theoretical models have been produced to characterize these phases over the last three. The lipid bilayer (or phospholipid bilayer) is a thin polar membrane made of two layers of lipid membranes are flat sheets that form a continuous barrier around all cell membranes of almost all organisms and many viruses are made of a lipid bilayer, as are the nuclear membrane surrounding the cell nucleus, and other membranes surrounding sub-cellular structures.

In this communication, we demonstrate the first use of sum-frequency generation (SFG) vibrational spectroscopy to measure directly the phase transition temperature (Tm) of a single planar supported lipid bilayer (PSLB).

Three saturated phospholipids, 1,2-dipalmitoyl-sn-glycerophosphocholine (DPPC), 1,2-diheptadecanoyl-sn-glycerophosphocholine (DHPC), and 1,2-distearoyl-sn-glycero-3 Cited by:   Headgroup and soft core interactions are added to a lipid monolayer-bilayer model and the surface pressure-area phase diagrams are calculated.

The results show that quite small headgroup interactions can have biologically significant effects on the transition temperature and the phase diagram. In particular, the difference in transition temperatures of lecithins and phosphatidyl ethanolamines Cited by: The order{disorder transition in model lipid bilayers is a rst-order hexatic to liquid phase transition Shachi Katira #, Kranthi K.

Mandadapu y, Suriyanarayanan Vaikuntanathan # z, Berend Smit x{k and David Chandler k Department of Bioengineering, University of California, Berkeley, CAUSA,yChemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA ,Cited by: 1.

Calculation of phase diagrams for non-ideal mixtures of lipids, and a possible non-random distribution of lipids in lipid mixtures in the liquid crystalline Cited by: Theory of modulated phases in lipid bilayers and liquid crystal films C.-M. Chen and F.

MacKintosh Department of Physics, University of Michigan, Ann Arbor, Michigan ~Received 5 September. We present a general theory for equilibrium-modulated phases of chiral and achiral bilayer membranes and liquid crystal films.

Simulation Studies of the Structural and Thermotropic Phase Behavior of Pure Ceramide Bilayers Timothy C. Moore1, Shan Guo1, Christopher R. Iacovella1, Clare McCabe1,2 1Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, 2Department of Chemistry, Vanderbilt University, Nashville, TN, Overview Force Field Validation.

The gel to liquid-crystalline phase transition is first-order with some of the characteristics of second-order transitions. First-order phase transitions have a change in enthalpy and volume at the phase transition temperature.

In other words, in first-order transitions there is an abrupt. Amodel for self-sustained potential oscillation of lipid bilayer membranesinducedbythegel-liquid crystal phasetransitions Kouichi Yagisawa,* Masayoshi Naito,* Ken-Ichiro Gondaira.

Phase Behavior of Model Lipid Bilayers†Cited by: Lipid Bilayers and Membrane Dynamics: Insight into Thickness Fluctuation Andrea C.

Woodka,1 1Paul D. Butler, Lionel Porcar,2 Bela Farago,2 and Michihiro Nagao,1,2,3 1 NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MDUSA, 2 Institut Laue Langevin, 6 rue Jules Horowitz, BPGrenoble Cedex 9, France.

diffusion with high concentrations of spin-label lipid (Scandella et al., ) and for studies of the phase diagrams of binary lipid mixtures in which one component is a spin-label lipid (Ito et al., ). Experimental Procedures Syntheses of Spin-Label Lipids. The spin-label fatty acids.

Phase transitions in lipid membranes Ibrahim Cissé Department of Physics, University of Illinois Urbana-Champaign Contact: [email protected] Abstract: Lipids are biological polymers with both a hydrophilic and a hydrophobic part.

When in solution, lipids can regroup to form vesicles. Start studying Biochemistry Chapter 9 Lipids. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

Search. Lipid Bilayers. bilayers of only one type of lipid undergo phase transition at distinct temperature. THERMODYNAMICS OF LIPID PHASE TRANSITIONS The fact that applying tension to a lipid bilayer must reduce the temperature at which phase separation occurs is easily deduced from thermodynamics as follows.

The internal energy, U, of a membrane is an extensive function of its entropy S, volume V, area A, and the number of molecules N i of component i. Abstract: We describe a simple coarse-grained model which is suited to study lipid layers and their phase transitions.

Lipids are modeled by short semiflexible chains of beads with a solvophilic head and a solvophobic tail component. They are forced to self-assemble into bilayers by a computationally cheap `phantom solvent' by:   Physicochemical properties of liposomes depend on many factors such as ionic strength, pH and temperature.

Usually liposomes have low permeability to the encapsulated molecules (unless the molecule is membrane permeable). The permeability of the m. Now in its second edition, the Handbook of Lipid Bilayers is a groundbreaking work that remains the field’s definitive text and only comprehensive source for primary physicochemical data relating to phospholipid bilayers.

Along with basic thermodynamic data, coverage includes both dynamic and structural properties of phospholipid bilayers. The 'structure' of a fluid bilayer is consequently defined operationally as the time-averaged spatial distributions of the principal structural (quasi-molecular) groups of the lipid (carbonyls, phosphates, etc.) projected onto an axis normal to the bilayer plane (), as shown in Figure 1 for the phosphate group of a phosphatidylycholine molecule.

The phase transitions of binary lipid mixtures are studied by a combination of Peltier-element-based adiabatic scanning calorimetry (pASC) and quartz crystal microbalance with dissipation monitoring (QCM-D). pASC, a novel type of calorimeter, provides valuable and unambiguous information on the heat capacity and the enthalpy, whereas QCM-D is proposed as a genuine way of determining phase Cited by: : Planar Lipid Bilayers: Methods and Applications (Biological Techniques Series) (): Hanke, W., Schulue, W.

R., Sattelle, David B.: BooksCited by: All are true for phase transitions of lipid bilayers EXCEPT A the transitions from BIOLOGY 13 at Institute of Bio-Chemistry, Molecular Biology and Bio Technology.

lipid bilayers can be detected with techniques like fluorescence recovery after photobleaching (FRAP) [8,9], single particle tracking (SPT) [], and optical laser trapping [13]. The diffusion of lipid molecules depends on the host bilayer instead of the lipid probe itself. cal models concerning the phase transformation pro-cess in lipid bilayers, computer simulations are an appropriate tool.

Using atomistic models, the liquid-crystalline phase has been studied extensively using MD (Tieleman et al., ). The gel phase has only been studied in a few MD studies, all based on pre. Biochemistry Unit 2 - Slide Set 4 study guide by tbare5 includes 75 questions covering vocabulary, terms and more.

Quizlet flashcards, activities and games help you improve your grades. Lipid rafts: phase separation in lipid bilayers studied with atomic force microscopy The lipid bilayers that form the surface of living cells have a rich structure, formed from many different lipids and proteins.

The self-organisation of these membranes into different domains is critical in many cell processes, such as.

Atomistic MD models z“Gel” phase with hexagonally packed chains at K. zTransition to fluid phase at K. zFluid region in centre of bilayer. zBilayer thickness = nm. zArea per lipid = nm2. K K Properties agree with experiment e.g. Moore et al. Phys.

Chem. B. The relative amount of all low melting lipid that is ,PC is defined as rho. We are interested in the transition from no domains to macroscopic phase separation as .tethered bilayer lipid membrane tBLM system that includes a comprehensive molecular-level structural and functional characterization.

This article focuses on a membrane system, illustrated in Fig. 1, that is chemically tethered to the support through a synthetic lipid. The advantages of such an ap-proach are discussed below.

Elastic area compressibility modulus. Homogeneous lipid mono- and bilayers can be modeled as two-dimensional structures, and therefore the membrane compression modulus K a is defined within one plane.

The bulk compressibility of a lipid bilayer is reported to be approximately x kPaFor comparison, the value for water is x kPa Studies show that monolayer .