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Related Concept Videos

Difference from Background: Limit of Detection01:05

Difference from Background: Limit of Detection

The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...
Excess Pressure Inside a Drop and a Bubble01:13

Excess Pressure Inside a Drop and a Bubble

The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
Rise of Liquid in a Capillary Tube01:18

Rise of Liquid in a Capillary Tube

When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
Two Components: Liquid–Liquid Systems01:27

Two Components: Liquid–Liquid Systems

A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...
Liquid–Solid Solutions01:29

Liquid–Solid Solutions

The process of a solid dissolving in a liquid to form a solution is governed by the solubility limit, which is the maximum amount of the solid substance, or solute, that can be dissolved in a specific volume of the liquid or solvent. As the solute dissolves, it reaches a point where no more solute can be dissolved at a given temperature - this is known as the saturation point. However, if further solute is added and it manages to dissolve, the solution becomes supersaturated. Supersaturated...
Measurement of Fluid Pressure01:16

Measurement of Fluid Pressure

Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...

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Detection of Cell-Free DNA in Blood Plasma Samples of Cancer Patients
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Surpassing sensitivity limits in liquid biopsy.

Tina Moser1,2, Ellen Heitzer1,2

  • 1Institute of Human Genetics, Diagnostic and Research Center for Molecular BioMedicine, Medical University of Graz, Graz, Austria.

Science (New York, N.Y.)
|January 18, 2024
PubMed
Summary
This summary is machine-generated.

Maximizing recovery can be achieved by reducing the rate at which cell-free DNA is cleared in the body. This strategy offers an alternative approach for improving sample yield.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genomics

Background:

  • Cell-free DNA (cfDNA) is released from cells into circulation.
  • Efficient clearance of cfDNA impacts its concentration and utility in diagnostics.
  • Understanding cfDNA kinetics is crucial for optimizing its recovery.

Purpose of the Study:

  • To investigate the potential of attenuating cfDNA clearance as a strategy.
  • To determine if reduced cfDNA clearance enhances overall recovery.
  • To explore novel methods for maximizing cfDNA yield.

Main Methods:

  • In vivo studies involving manipulation of clearance pathways.
  • Development of assays to quantify cfDNA levels and clearance rates.
  • Comparative analysis of cfDNA recovery under different clearance conditions.

Main Results:

  • Demonstrated that attenuating cfDNA clearance significantly increases circulating cfDNA levels.
  • Showcased a novel approach to enhance cfDNA recovery in biological samples.
  • Identified key factors influencing cfDNA clearance in vivo.

Conclusions:

  • Reducing in vivo cell-free DNA clearance is a viable strategy for maximizing recovery.
  • This approach holds promise for improving cfDNA-based diagnostics and research.
  • Further research is warranted to optimize and translate this method.