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Related Concept Videos

Three-Dimensional Microscopy in Microbiology01:28

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Three-dimensional imaging techniques are essential in cell biology, allowing researchers to visualize intricate cellular structures with high resolution. Two prominent methods, Differential Interference Contrast Microscopy (DIC) and Confocal Scanning Laser Microscopy (CSLM), provide distinct advantages for imaging live and thick specimens, respectively.Differential Interference Contrast MicroscopyDIC microscopy enhances contrast in transparent, unstained samples by converting phase...
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Quantifying Microorganisms at Low Concentrations Using Digital Holographic Microscopy DHM
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Multiparametric quantification of bacterial cells using digital holographic microscopy.

Álvaro Cano1, Adrián Sanz-Jiménez1, Oscar Malvar2

  • 1Instituto de Micro y Nanotecnología, IMN-CNM (CEI UAM + CSIC), Isaac Newton 8, Tres Cantos, Madrid, 28760, Spain.

Scientific Reports
|November 20, 2025
PubMed
Summary

Digital holographic microscopy (DHM) precisely measures bacterial dry mass and morphology for precision microbiology. This technique distinguishes cell types and growth states, offering an alternative to nanomechanical mass spectrometry.

Keywords:
Bacterial cellsDigital holographic microscopyDry mass quantificationNanomechanical mass spectrometry

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Area of Science:

  • Microbiology
  • Biophysics
  • Optical Imaging

Background:

  • Precision microbiology requires accurate measurement of bacterial physical properties.
  • Digital holographic microscopy (DHM) offers a non-invasive method for cellular analysis.

Purpose of the Study:

  • To employ DHM for high-throughput measurement of individual bacterial dry mass and morphology.
  • To assess DHM's capability in discriminating bacterial cell types and physiological states.

Main Methods:

  • Utilized digital holographic microscopy (DHM) for rapid, high-throughput acquisition of quantitative phase images.
  • Applied image processing techniques including polynomial background correction, Gaussian filtering, and adaptive masking.
  • Measured dry mass and morphological features of Staphylococcus epidermidis and Escherichia coli.

Main Results:

  • Successfully quantified the dry mass of individual S. epidermidis and E. coli cells.
  • Obtained detailed morphological information, enabling discrimination between cocci (single vs. clustered) and identification of bacilli elongation patterns.
  • DHM results were compared with nanomechanical mass spectrometry (NMS) data.

Conclusions:

  • DHM is a powerful tool for measuring bacterial dry mass and morphology, crucial for precision microbiology.
  • The technique provides insights into bacterial growth and physiological state through morphological analysis.
  • DHM presents a viable alternative or complementary method to NMS for bacterial characterization.