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Related Concept Videos

Three-Dimensional Microscopy in Microbiology01:28

Three-Dimensional Microscopy in Microbiology

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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The development of flow cytometry techniques began in 1934 with initial attempts by Andrew Moldavan, a bacteriologist who counted the cells in a flowing capillary system. Moldavan pumped cells through a capillary tube focused under a microscope for visualization. The invention of photometry allowed the measurement of differentially-stained cells, and Louis Kamentsky developed the first multiparameter flow cytometer in 1965 to identify and count the cancer cells in cervical tissue specimens.
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Wide-field Fluorescent Microscopy and Fluorescent Imaging Flow Cytometry on a Cell-phone
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A robust electrical microcytometer with 3-dimensional hydrofocusing.

Nicholas Watkins1, Bala Murali Venkatesan, Mehmet Toner

  • 1Department of Electrical and Computer Engineering, Micro and Nanotechnology Laboratory, University of Illinois, Urbana, IL 61801, USA.

Lab on a Chip
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a microcytometer for electrical blood cell counting, specifically CD4+ T lymphocytes, crucial for HIV/AIDS diagnosis. The device offers a portable, cost-effective solution for accurate cell counts, even in resource-limited settings.

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Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Immunology

Background:

  • Accurate CD4+ T lymphocyte counts are vital for HIV/AIDS diagnosis and treatment monitoring.
  • Current methods like flow cytometry can be expensive and inaccessible in resource-limited settings.
  • Microfluidic devices offer potential for portable and cost-effective cell analysis.

Purpose of the Study:

  • To develop and validate a microcytometer for electrical counting of blood cell populations, focusing on CD4+ T lymphocytes.
  • To investigate the use of a 3D hydrodynamic focusing mechanism to enhance signal quality and accuracy.
  • To assess the device's capability for differentiating live and dead lymphocyte populations.

Main Methods:

  • Utilized AC impedance interrogation in a microfabricated cytometer (microcytometer).
  • Employed a 3D hydrodynamic focusing mechanism, validated through fluidic simulations and experiments.
  • Compared microcytometer T cell counts with a standard flow cytometer using small blood sample volumes (approx. 20 microL).

Main Results:

  • Optimal 3D sheath flow settings increased impedance pulse signal-to-noise ratio by 44.4% and improved particle size distribution accuracy.
  • Microcytometer T cell counts closely correlated with industry-standard flow cytometry over three orders of magnitude.
  • The device successfully differentiated between live and dead/dying lymphocyte populations.

Conclusions:

  • The developed microcytometer provides a portable, rapid, and inexpensive method for blood cell counting.
  • This technology has the potential to significantly improve diagnostics and treatment monitoring for HIV/AIDS, particularly in resource-poor regions.
  • The device's ability to distinguish live/dead cells adds further clinical utility.