Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
X-ray Crystallography02:18

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Structural analysis of the lyotropic phases in alpha-olefin sulfonate as a function of water content and temperature.

Journal of colloid and interface science·2026
Same author

Efficacy of Perineural Dextrose Versus Corticosteroid Injection for Carpal Tunnel Syndrome: A Randomized, Double-Blind Clinical Trial.

Muscle & nerve·2026
Same author

Ten questions on membrane biophysics.

Biochimica et biophysica acta. Biomembranes·2026
Same author

Lipid-phase-modulated interactions of gold nanoparticles with supported vesicular and planar membranes.

Colloids and surfaces. B, Biointerfaces·2026
Same author

Force sharing between the liposome biomembrane and viscous core: an experimental study.

Journal of liposome research·2026
Same author

From biting to engulfment: curvature-actin coupling controls phagocytosis of soft, deformable targets.

bioRxiv : the preprint server for biology·2026
Same journal

Quantum simulations of the ballistic motion of a surface adsorbate.

Physical chemistry chemical physics : PCCP·2026
Same journal

Enhancement of triplet-triplet annihilation upconversion in organically modified clay colloids.

Physical chemistry chemical physics : PCCP·2026
Same journal

What is so special about benzene? A comparison of selected carbon and silicon isomers E<sub>6</sub>H<sub>6</sub> (E = C, Si).

Physical chemistry chemical physics : PCCP·2026
Same journal

Synergistic effects of porosity and sulfur doping on hard carbon for superior sodium-ion storage.

Physical chemistry chemical physics : PCCP·2026
Same journal

Force-resolved and recurrence-based identification of dynamical heterogeneity in liquid water.

Physical chemistry chemical physics : PCCP·2026
Same journal

Thermoelectric properties of layered Bi<sub>2</sub>YO<sub>4</sub>Br: a cageless rattler host structure.

Physical chemistry chemical physics : PCCP·2026
See all related articles

Related Experiment Video

Updated: Jun 6, 2026

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
08:44

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene

Published on: August 22, 2017

Elastic deformations in hexagonal phases studied by small-angle X-ray diffraction and simulations.

Šárka Perutková1, Matej Daniel, Michael Rappolt

  • 1Laboratory of Biophysics, Faculty of Electrical Engineering, University of Ljubljana, Tržaška 25, SI-1000 Ljubljana, Slovenia.

Physical Chemistry Chemical Physics : PCCP
|November 11, 2010
PubMed
Summary
This summary is machine-generated.

Phospholipid self-assemblies in inverse hexagonal phases (H(II)) exhibit non-circular pivotal planes due to packing constraints. This study quantifies these deviations and determines key parameters like mean intrinsic curvature and chain stiffness.

More Related Videos

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
11:14

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

Published on: May 28, 2016

Related Experiment Videos

Last Updated: Jun 6, 2026

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
08:44

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene

Published on: August 22, 2017

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
11:14

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

Published on: May 28, 2016

Area of Science:

  • Materials Science
  • Biophysics
  • Physical Chemistry

Background:

  • Phospholipid self-assemblies form various structures, including the inverse hexagonal phase (H(II)).
  • Packing constraints in H(II) phases cause deviations from circularity in the pivotal plane's cross-section.
  • Understanding these deviations is crucial for comprehending lipid behavior and phase formation.

Purpose of the Study:

  • To experimentally and theoretically investigate the deviations from circularity of the pivotal plane in H(II) phospholipid phases.
  • To determine the mean intrinsic curvature (H(m)) and hydrocarbon chain stiffness (τ) in these systems.
  • To establish a relationship between bending deformation and hydrocarbon chain stretching.

Main Methods:

  • Analysis of small-angle X-ray diffraction data for dioleoyl-phosphatidylethanolamine (DOPE) and stearoyl-oleoyl-phosphatidylethanolamine (SOPE).
  • Monte Carlo (MC) simulated annealing to calculate free energy variations and determine equilibrium pivotal plane contours.
  • Solving non-linear differential equations using variational calculus to validate MC results.

Main Results:

  • Experimental and theoretical data reveal non-circular cross-sections of the polar/apolar interface in H(II) phases.
  • MC calculations successfully predicted equilibrium pivotal plane contours and determined H(m) and τ values.
  • A correlation between bending deformation and hydrocarbon chain stretching was established.

Conclusions:

  • The study quantifies the non-circularity of pivotal planes in H(II) phospholipid phases.
  • Predicted ranges for mean intrinsic curvature and chain stiffness align with experimental observations.
  • The findings provide insights into the elastic properties and deformation mechanisms of lipid bilayers.