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Related Concept Videos

Mechanism of Ciliary Motion01:05

Mechanism of Ciliary Motion

The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...
Mechanism of Ciliary Motion01:05

Mechanism of Ciliary Motion

The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
Polarity of the Cytoskeleton01:18

Polarity of the Cytoskeleton

The intrinsic polarity of cells can be primarily attributed to two factors- i) the asymmetric accumulation of mobile components such are regulatory molecules and subcellular components across the cell and ii) the orientation of polar cytoskeletal filaments that make up the cytoskeletal networks, specifically microfilaments, and microtubules arranged along the axis of polarity. Interactions between the cytoskeletal filaments are crucial for the establishment and maintenance of the polar nature...

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Related Experiment Video

Updated: Jun 23, 2026

Microfluidic-based Electrotaxis for On-demand Quantitative Analysis of Caenorhabditis elegans' Locomotion
10:23

Microfluidic-based Electrotaxis for On-demand Quantitative Analysis of Caenorhabditis elegans' Locomotion

Published on: May 2, 2013

Relativistic electron spin motion in cycloatoms.

Q Su, P Peverly, R Wagner

    Optics Express
    |May 7, 2009
    PubMed
    Summary

    Computer simulations reveal a "cycloatom" formation from relativistic electron motion in atoms subjected to magnetic and laser fields. Spin-orbit coupling significantly alters electron spin dynamics, even when initially aligned with the magnetic field.

    Area of Science:

    • Atomic Physics
    • Quantum Mechanics
    • Computational Physics

    Background:

    • Atoms in strong electromagnetic fields exhibit complex behaviors.
    • Relativistic effects become prominent for atomic electrons under specific conditions.
    • Spin-orbit coupling is a crucial interaction in atomic systems.

    Purpose of the Study:

    • To visualize the time evolution of an atom in combined static magnetic and laser fields.
    • To investigate the formation and properties of cycloatoms.
    • To analyze the impact of spin-orbit coupling on relativistic electron spin dynamics.

    Main Methods:

    • Classical and quantum mechanical simulations were employed.
    • Computer movies were generated to illustrate time evolution.

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    Microfluidic-based Electrotaxis for On-demand Quantitative Analysis of Caenorhabditis elegans' Locomotion
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  • Analysis focused on spatial probability density and spin-distribution evolution.

    • Main Results:

    • The formation of a ring-like spatial probability density, termed a cycloatom, was observed.
    • Significant modification of spin-time dependence due to spin-orbit coupling was demonstrated.
    • Space-resolved spin measurements in relativistic quantum states were analyzed.

    Conclusions:

    • Cycloatom formation is a key phenomenon in strong field atomic physics.
    • Spin-orbit coupling plays a critical role in relativistic spin dynamics within cycloatoms.
    • The study provides insights into the nature of space-resolved spin measurements.