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Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value. 
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Understanding the formal definition of a limit is essential for precise mathematical analysis. This concept allows us to rigorously determine how a function behaves near a particular point without relying on ambiguous notions such as "getting close." The ε-δ definition plays a foundational role in calculus, ensuring analytical clarity and logical consistency in limit evaluation.The formal definition states that the limit of a function f(x) as x approaches a is L, written asif for...
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The ChIP-exo Method: Identifying Protein-DNA Interactions with Near Base Pair Precision
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High-Precision Lens-Less Flow Cytometer on a Chip.

Yuan Fang1,2, Ningmei Yu3, Yuquan Jiang4

  • 1School of Automation and Information Engineering, Xi'an University of Technology, Xi'an 710048, China. fangyuanmy@163.com.

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|November 15, 2018
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Summary

This study introduces a compact flow cytometer on a microfluidic chip for rapid, high-precision cell analysis. The device achieves less than 2% cell counting error, making it ideal for point-of-care testing.

Keywords:
POCTcell analysislens-lessmicrofluidic chiptwin-image removal

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Area of Science:

  • Biomedical Engineering
  • Microfluidics
  • Optical Microscopy

Background:

  • High-speed cell analysis requires rapid cell flow, posing challenges for traditional microscopy requiring long exposure times.
  • Integrating flow cytometry with microscopy on a microfluidic chip offers potential for compact, efficient cell analysis.
  • Lens-free holographic microscopy presents an alternative imaging technique for microfluidic systems.

Purpose of the Study:

  • To develop a high-speed, high-precision flow cytometer integrated with a lens-free holographic microscope on a microfluidic chip.
  • To address the challenge of high cell velocity versus long exposure times in inline holographic microscopy.
  • To enhance hologram reconstruction speed and accuracy for reliable cell concentration determination.

Main Methods:

  • Implementation of an S-type microchannel and a pulse injection method to manage high-speed cell flow.
  • Improvement of the iterative initial constraint method for faster and more accurate hologram reconstruction.
  • Development of a background removal method to enhance image quality and analysis accuracy.

Main Results:

  • Accurate calculation of focus images and cell concentrations was achieved using the developed methods.
  • Cell counting precision was validated using whole blood cells, with a measured error of less than 2%.
  • The integrated system demonstrated high precision in on-chip flow cytometry.

Conclusions:

  • The developed on-chip flow cytometer offers high precision and accuracy for cell analysis.
  • Its low cost and small size make it suitable for field applications, including underdeveloped regions and outdoor use.
  • The system is particularly well-suited for point-of-care testing (POCT) applications.