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Related Concept Videos

Atomic Nuclei: Types of Nuclear Relaxation01:28

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Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Gentle Label-Free Nonlinear Optical Imaging Relaxes Linear-Absorption-Mediated Triplet.

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Summary
This summary is machine-generated.

Intense laser excitation causes phototoxicity through linear absorption, not nonlinear absorption. A new rapid scanning technique mitigates this damage, enabling gentle, label-free molecular imaging of live samples.

Keywords:
fluorescence microscopynonlinear optical imagingphototoxicitytriplet

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Area of Science:

  • Biophotonics
  • Microscopy
  • Cellular Imaging

Background:

  • Live-cell microscopy demands gentle sample preparation to maintain cellular health.
  • Light-sheet microscopy uses planar excitation for reduced photodamage.
  • Laser-scanning nonlinear optical microscopy (LS-NLM) has not achieved broad adoption for gentle, label-free molecular imaging despite restricted excitation.

Purpose of the Study:

  • To investigate the mechanism of phototoxicity in laser-scanning nonlinear optical microscopy.
  • To propose and validate a method for mitigating phototoxicity in label-free imaging.
  • To enable gentle, real-time molecular imaging of live biological samples.

Main Methods:

  • Developed a phototoxicity assay using time-lapse autofluorescence elevation (hyper-fluorescence) in a chicken breast tissue model.
  • Investigated phototoxicity induced by intense near-infrared excitation in laser-scanning nonlinear optical microscopy.
  • Implemented a rapid scanning technique with sub-80-femtosecond excitation and full triplet relaxation.

Main Results:

  • Provided strong evidence that phototoxicity arises from linear absorption by intrinsic biomolecules and subsequent triplet buildup, not nonlinear absorption.
  • Demonstrated that the proposed rapid scanning technique effectively mitigates linear-absorption-mediated phototoxicity across different sample types.
  • Achieved real-time, label-free imaging of freely moving Caenorhabditis elegans (C. elegans) at high irradiance levels.

Conclusions:

  • Linear absorption is the primary driver of phototoxicity in laser-scanning nonlinear optical microscopy.
  • A simple, rapid scanning imaging technique can overcome phototoxicity limitations.
  • This approach facilitates gentle, label-free molecular imaging for live biological samples, including C. elegans.