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Two-Dimensional Microscopy in Microbiology01:29

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Two-dimensional (2D) microscopy encompasses a range of optical techniques that capture images within a single focal plane, offering detailed representations of microscopic structures. These techniques are essential in biological and medical research, enabling the visualization of cellular and subcellular structures with different levels of contrast and specificity.There are several major types of 2D microscopy, each with strengths and applications.Bright-Field MicroscopyBright-field microscopy...
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Two-photon microscopy for microrobotics: Visualization of micro-agents below fixed tissue.

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Two-photon microscopy enables deeper visualization of micro-agents within biological tissues, overcoming optical microscopy limitations. This advancement is crucial for microrobotics research and potential in vivo applications.

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Area of Science:

  • Biomedical Engineering
  • Optical Imaging
  • Robotics

Background:

  • Optical microscopy offers high spatio-temporal resolution but is limited to ~100 μm penetration depth in biological tissues.
  • Visualizing microrobotic agents (micro-agents) below tissue surfaces is a significant challenge in current microrobotics research.
  • Two-photon microscopy (TPM) provides deeper tissue penetration (>500 μm) and sub-micron resolution, with applications in live tissue imaging and direct laser writing fabrication.

Purpose of the Study:

  • To introduce and evaluate two-photon microscopy as a novel imaging technique for visualizing micro-agents beneath biological tissue.
  • To demonstrate the capability of TPM for deep-tissue imaging of micro-agents in microrobotics applications.
  • To explore the potential of TPM for advancing in vivo microrobotics visualization.

Main Methods:

  • Fabrication of two types of micro-agents: exogenous fluorophore-stained electrospun fibers and autofluorescent resin-printed bio-inspired structures using direct laser writing (DLW).
  • Experimental setup for three-dimensional reconstruction of micro-agents and qualitative study of laser-tissue interaction.
  • Utilization of second-harmonic generation for simultaneous visualization of micro-agents and surrounding tissue.

Main Results:

  • Demonstrated two-photon microscopy imaging of micro-agents below formalin-fixed tissue with a maximum penetration depth of 800 μm.
  • Achieved continuous imaging of magnetic electrospun fibers at a rate of one frame per second within a 135 × 135 μm² field of view.
  • Successfully visualized micro-agents alongside tissue structures, confirming TPM's utility.

Conclusions:

  • Two-photon microscopy serves as a viable alternative imaging modality for microrobotics, enabling visualization of micro-agents beyond the limitations of conventional optical microscopy.
  • The study validates TPM for micro-agent imaging under in vitro and ex ovo conditions, paving the way for deeper tissue exploration.
  • Integrating TPM with microrobotics holds significant potential for future in vivo applications, enhancing the capabilities of micro-robotic systems in biological environments.