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

Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

799
Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
799
Unsymmetric Bending01:18

Unsymmetric Bending

754
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The...
754
Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

731
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
731
Conformations of Cycloalkanes02:29

Conformations of Cycloalkanes

14.0K
Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3  hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that...
14.0K
Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

734
Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
734
Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

3.7K
The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
3.7K

You might also read

Related Articles

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

Sort by
Same author

Exciton trapping with a twist.

Chemical science·2025
Same author

The Right Strap: The Role of Tether Position and Length in Acene Distortion.

Organic letters·2025
Same author

Unravelling quantum dot-molecule interactions for π-conjugated ligands: insights into binding and anchoring group effects.

Nanoscale horizons·2025
Same author

Magneto-chiral dichroism in a chiral twistacene ytterbium(iii) one-dimensional assembly of single-molecule magnets.

Inorganic chemistry frontiers·2025
Same author

The photochemistry and photophysics of benzoyl-carbazole.

Physical chemistry chemical physics : PCCP·2024
Same author

Controlling helicene's pitch by molecular tethering.

Organic & biomolecular chemistry·2024
Same journal

Ethanol's Dual Role as a Mediator and Green Solvent in Photocatalytic Hydrogen Atom Transfer-Enabled Formal Ring-Closing Metathesis toward 2-Quinolinones.

The Journal of organic chemistry·2026
Same journal

Scalable Syntheses of Pseudouridine and <i>N</i><sup>1</sup>-Methylpseudouridine.

The Journal of organic chemistry·2026
Same journal

Silyl Radical Formation from Silanethiols via Sulfur Atom Transfer with Phosphinites.

The Journal of organic chemistry·2026
Same journal

Chiral Benzimidazole Manganese Catalysts for Asymmetric Transfer Hydrogenation of 3-Substituted 2<i>H</i>-1,4-Benzoxazines.

The Journal of organic chemistry·2026
Same journal

Thia-Michael Stapling of Allenamide-Incorporated α-Helical Antimicrobial Peptides.

The Journal of organic chemistry·2026
Same journal

Ru(II)-Catalyzed Hydrodefluorination of Monofluoroalkenes.

The Journal of organic chemistry·2026
See all related articles

Related Experiment Video

Updated: Jan 8, 2026

Design and Synthesis of a Reconfigurable DNA Accordion Rack
07:44

Design and Synthesis of a Reconfigurable DNA Accordion Rack

Published on: August 15, 2018

7.4K

Twisting BN-Acenes: A Computational Study.

Yuval Rahav1, Ori Gidron1

  • 1Institute of Chemistry and Center for Nanoscience and Nanotechnology, The Hebrew University, Jerusalem 9190401, Israel.

The Journal of Organic Chemistry
|December 13, 2025
PubMed
Summary
This summary is machine-generated.

Researchers explored twisted boron-nitrogen acenes (BN-acenes) for modified electronic properties. They found nitrogen placement impacts strain and allows greater tuning of the HOMO-LUMO gap compared to carbon analogues.

More Related Videos

Magnetic Tweezers for the Measurement of Twist and Torque
11:41

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

23.8K
Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
13:56

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

8.0K

Related Experiment Videos

Last Updated: Jan 8, 2026

Design and Synthesis of a Reconfigurable DNA Accordion Rack
07:44

Design and Synthesis of a Reconfigurable DNA Accordion Rack

Published on: August 15, 2018

7.4K
Magnetic Tweezers for the Measurement of Twist and Torque
11:41

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

23.8K
Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
13:56

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

8.0K

Area of Science:

  • Organic Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Boron-nitrogen (BN) acenes, analogs of acenes with B-N bonds replacing C=C bonds, exhibit altered optical and electronic properties.
  • Twisting molecular structures is a known method to tune photophysical and electronic characteristics.

Purpose of the Study:

  • To investigate the thermodynamic and electronic properties of twisted BN-anthracenes using computational methods.
  • To explore the feasibility and effects of twisting linear BN-acenes, a previously unreported area.

Main Methods:

  • Density Functional Theory (DFT) calculations.
  • Analysis of thermodynamic stability and electronic structure.
  • Investigation of molecular geometry and strain energy.

Main Results:

  • The position of the nitrogen atom significantly influences the strain energy in twisted BN-anthracenes.
  • BN-acenes offer greater tunability of the Highest Occupied Molecular Orbital-Lowest Unoccupied Molecular Orbital (HOMO-LUMO) gap compared to their all-carbon counterparts.
  • Computational models successfully simulated twisted BN-anthracene structures.

Conclusions:

  • Strategic placement of nitrogen is key to minimizing strain in twisted BN-acenes.
  • Twisted BN-acenes present a promising avenue for developing novel materials with tunable electronic properties.
  • This study provides a computational foundation for the synthesis and application of twisted BN-acenes.