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Related Concept Videos

Density00:56

Density

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Density is an important characteristic of substances, crucial in determining whether an object sinks or floats in a fluid. Its SI unit is kg/m3, and its cgs unit is g/cm3. The density of an object helps in identifying its composition, and also reveals information about the phase of the matter and its substructure. The densities of liquids and solids are roughly comparable, consistent with the fact that their atoms are in close contact. However, gases have much lower densities than liquids and...
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A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
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Current Density01:21

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The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...
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Strain-Energy Density01:20

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Understanding the strain energy density in materials under axial load is crucial for evaluating their mechanical behavior and durability. When a rod is subjected to such a load, it elongates and stores energy, known as strain energy, as potential energy within the material. This energy is measured in terms of energy per unit volume.
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Bulk Density of Aggregate01:22

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Bulk density refers to the mass of aggregate particles that would fill a unit volume. The concept of bulk density originates from the inability to pack aggregate particles in a manner that completely eliminates void spaces. Hence, the term bulk refers to the volume that encompasses both the aggregates and the voids. This measurement is crucial when aggregates are batched by volume and is used to convert quantities by mass to volume.
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Related Experiment Video

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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly
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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

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Time Sequential Single-Cell Patterning with High Efficiency and High Density.

Yang Liu1, Dahai Ren2, Xixin Ling3

  • 1State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China. ly-15@tsinghua.org.cn.

Sensors (Basel, Switzerland)
|November 2, 2018
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Summary

This study introduces a microfluidic device for precise single-cell trapping using hydrodynamic forces. The novel design enhances cell capture efficiency and speed for high-throughput biological analysis.

Keywords:
cell patterningcell trappinglab-on-a-chipmicrofluidicssingle-cell analysis

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Area of Science:

  • Biotechnology
  • Microfluidics
  • Cell Biology

Background:

  • Single-cell capture is crucial for detailed cellular analysis and manipulation.
  • Existing methods face limitations in efficiency, speed, and scalability.

Purpose of the Study:

  • To develop and validate a microfluidic device for deterministic single-cell trapping.
  • To optimize the device for high capture efficiency, speed, and cell density.

Main Methods:

  • Design of a microfluidic device featuring an S-shaped loop channel and arrayed hydrodynamic trap units.
  • Theoretical modeling and simulation to optimize geometric parameters.
  • Experimental validation using MCF-7 and Jurkat cells.

Main Results:

  • Achieved up to 100% capture efficiency and 95% single-cell capture efficiency.
  • Demonstrated high cell density (200 traps/mm²) enabling simultaneous observation of 100 cells.
  • Trapped 1,000 cells sequentially in under 2 minutes, surpassing previous devices.
  • Successfully demonstrated scalable design with 32,000 trap sites on a single chip.

Conclusions:

  • The developed microfluidic device offers superior performance for deterministic single-cell trapping.
  • The device is a powerful tool for high-throughput single-cell analysis, investigating cell heterogeneity, and drug screening.
  • The technology is scalable and facilitates efficient cell recovery.