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Updated: Jun 12, 2026

Simultaneous Multicolor Imaging of Biological Structures with Fluorescence Photoactivation Localization Microscopy

Simultaneous Multicolor Imaging of Biological Structures with Fluorescence Photoactivation Localization Microscopy

Published on: December 9, 2013

Imaging label-free intracellular structures by localisation microscopy.

Rainer Kaufmann¹, Patrick Müller², Michael Hausmann²

¹Applied Optics and Information Processing, Kirchhoff-Institute for Physics, University Heidelberg, Im Neuenheimer Feld 227, D-69120 Heidelberg, Germany.

Micron (Oxford, England : 1993)

|June 12, 2010

Summary

This summary is machine-generated.

Researchers achieved super-resolution microscopy in label-free cells using Spectral Precision Distance/Position Determination Microscopy (SPDM). This technique reveals cellular structures with optical resolution around 50 nm, surpassing conventional imaging limits.

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Last Updated: Jun 12, 2026

Simultaneous Multicolor Imaging of Biological Structures with Fluorescence Photoactivation Localization Microscopy

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Area of Science:

Biophysics
Optical Microscopy
Cell Biology

Background:

Conventional light microscopy is limited by the Abbe-Rayleigh diffraction limit (∼200 nm laterally, ∼600 nm axially).
Super-resolution microscopy typically relies on specific labeling with fluorochromes or fluorescent proteins.

Purpose of the Study:

To demonstrate label-free super-resolution microscopy.
To achieve optical resolution in the λ/10 range (∼50 nm) without exogenous labels.
To reveal previously undetectable cellular structures.

Main Methods:

Utilized Spectral Precision Distance/Position Determination Microscopy (SPDM).
SPDM is based on the principles of localisation microscopy.
Applied SPDM to label-free cellular samples.

Main Results:

Achieved optical resolution of ∼50 nm in cellular structures.
Demonstrated super-resolution imaging without the need for fluorescent labels.
SPDM significantly improved resolution of autofluorescent structures.
Revealed cellular objects not visible with conventional fluorescence imaging.

Conclusions:

Spectral Precision Distance/Position Determination Microscopy (SPDM) enables label-free super-resolution imaging.
This advancement overcomes the limitations of conventional microscopy and labeling requirements.
SPDM offers new possibilities for visualizing cellular ultrastructure.