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Related Concept Videos

Kinematic Equations for Rotation01:30

Kinematic Equations for Rotation

In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
For instance, imagine a point A on a rigid body engaged in circular motion. The translational velocity of this particular point can be calculated by taking the time derivatives of the displacement equation, which essentially measures the...
Equation of Rotational Dynamics01:08

Equation of Rotational Dynamics

Angular variables are introduced in rotational dynamics. Comparing the definitions of angular variables with the definitions of linear kinematic variables, it is seen that there is a mapping of the linear variables to the rotational ones. Linear displacement, velocity, and acceleration have their equivalents in rotational motion, which are angular displacement, angular velocity, and angular acceleration. Similar to the rotational variables, a mapping exists from Newton's second law of motion...
Microtubule Associated Motor Proteins01:32

Microtubule Associated Motor Proteins

Eukaryotic cells have different motor proteins for transporting various cargo within the cell. These motor proteins differ based on the filament they associate with, the direction they move within the cell, and the type of cargo they transport. Motor proteins that associate with microtubules are known as microtubule-associated motor proteins. There are two families of microtubule-associated motor proteins —Kinesins and Dyneins. Both these proteins assist in the transport of cellular cargos...
Rotational Motion about a Fixed Axis01:26

Rotational Motion about a Fixed Axis

A rigid body's rotation around a fixed axis makes every point within it trace a circular path around a specific line or point. The term given to this type of spinning is defined by the angular position, symbolized by the angle θ. This angle is gauged from a static reference line to the revolving object. From this angular position, any variation is referred to as angular displacement, denoted by dθ. The extent of this displacement can be calculated in degrees, radians, or revolutions, where one...
The Movement of Organelles and Vesicles01:43

The Movement of Organelles and Vesicles

In eukaryotic cells,  cytoskeletal filaments such as actin, microtubules, and intermediate filaments form a mesh-like cytoskeletal network. These filaments serve as tracks for transporting cellular cargo. Specialized motor proteins use the chemical energy stored in adenosine triphosphate (ATP) for this transport. During interphase, microtubules are polarized, with the plus-end towards the cell periphery and the minus-end towards the cell center. Two microtubule-associated motor proteins,...
Mechanism of Ciliary Motion01:05

Mechanism of Ciliary Motion

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Related Experiment Video

Updated: May 22, 2026

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging
08:40

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

Published on: March 13, 2019

Synchronous Rotation Dynamics in a Molecular Motor.

Robert Kluifhooft1, Janna Wilhelmsen1, Marco Kapitzke1

  • 1Department of Chemistry, Humboldt-Universität zu Berlin, Berlin 12489, Germany.

Journal of the American Chemical Society
|May 21, 2026
PubMed
Summary
This summary is machine-generated.

Researchers directly measured molecular motion in a light-driven molecular motor. They observed a barrier-free rotation, enabling analysis of nanoscale mechanics and molecular machine function.

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Biophysical Characterization of Flagellar Motor Functions
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Production of Dynein and Kinesin Motor Ensembles on DNA Origami Nanostructures for Single Molecule Observation
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Production of Dynein and Kinesin Motor Ensembles on DNA Origami Nanostructures for Single Molecule Observation

Published on: October 15, 2019

Related Experiment Videos

Last Updated: May 22, 2026

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging
08:40

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

Published on: March 13, 2019

Biophysical Characterization of Flagellar Motor Functions
06:08

Biophysical Characterization of Flagellar Motor Functions

Published on: January 18, 2017

Production of Dynein and Kinesin Motor Ensembles on DNA Origami Nanostructures for Single Molecule Observation
08:09

Production of Dynein and Kinesin Motor Ensembles on DNA Origami Nanostructures for Single Molecule Observation

Published on: October 15, 2019

Area of Science:

  • Chemical Physics
  • Nanotechnology
  • Molecular Machines

Background:

  • Directly measuring molecular motion during chemical reactions is crucial for understanding how molecular machines perform work.
  • Thermal fluctuations often dictate reaction rates, obscuring underlying molecular dynamics in most systems.

Purpose of the Study:

  • To study the rotational dynamics of an artificial light-driven molecular motor around its central double bond.
  • To overcome the limitations of thermal fluctuations in observing molecular motion during chemical reactions.

Main Methods:

  • Femtosecond transient absorption spectroscopy
  • Femtosecond fluorescence spectroscopy

Main Results:

  • Observed a synchronous, barrier-free first rotation step of approximately 28° in the molecular motor ensemble.
  • Measurements were representative of true molecular dynamics, not masked by thermal fluctuations.
  • Estimated rotation speed and the influence of inertia, friction, and strain.

Conclusions:

  • Proposed a simplified nanomechanical model for the artificial molecular motor.
  • Established a new framework for investigating nanoscale work and analyzing the mechanics of synthetic and biological molecular machines.