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Related Concept Videos

Application of Integration: Problem Solving01:30

Application of Integration: Problem Solving

94
The process of breathing involves the periodic intake and expulsion of air, known as the respiratory cycle, which typically lasts about five seconds. Modeling the volume of air inhaled into the lungs as a function of time provides insight into both the dynamics and efficiency of pulmonary ventilation. This volume is determined by integrating the airflow rate over time, which captures the cumulative effect of air entering the lungs.Sinusoidal Model of AirflowAirflow during respiration is not...
94
Applications of Integration to Find Hydrostatic Pressure01:30

Applications of Integration to Find Hydrostatic Pressure

67
Hydrostatic force is a fluid's total force at rest on a surface. For a horizontal surface submerged at a fixed depth, the pressure is constant and calculated as the product of fluid density, gravitational acceleration, and depth. In the case of a vertical dam wall submerged in water, this force is not evenly distributed due to the increasing pressure with depth. This variation arises from the cumulative weight of the water above each point. Integration is used to account for the continuous...
67
Applications of Integration to Find Centers of Mass01:30

Applications of Integration to Find Centers of Mass

77
Rotational equilibrium provides a natural framework for defining the center of mass of a system. For a plank balanced on a pivot with two unequal masses, equilibrium is achieved when the net torque about the pivot is zero. Torque is defined as the product of a force and its perpendicular distance from the pivot. When the torques due to all forces cancel, the pivot coincides with the center of mass of the system.For a system composed of several discrete point masses, the center of mass lies at...
77
Applications of Integration to Find Blood Flow01:27

Applications of Integration to Find Blood Flow

49
Blood flow through a cylindrical blood vessel can be mathematically described using the principles of laminar flow, a regime in which fluid moves smoothly in parallel layers. In this model, the velocity of the blood is not uniform across the cross-section of the vessel; rather, it varies with the radial distance from the center. The maximum velocity occurs along the central axis, decreasing progressively toward the vessel walls, where it reaches zero due to viscous drag.Approximating Blood...
49
Applications of Integration to Find Consumer Surplus01:29

Applications of Integration to Find Consumer Surplus

57
In microeconomics, consumer surplus represents the economic gain that consumers experience when they purchase a good or service for less than the highest price they are willing to pay. This surplus arises from the characteristics of the demand function, which links the quantity of a good to the price consumers are willing to pay. As the quantity of a good increases, the price that consumers are willing to pay for each additional unit typically decreases, resulting in a downward-sloping demand...
57
Applications of Integration to Probability Density Functions01:27

Applications of Integration to Probability Density Functions

55
Continuous probability distributions are used to model random variables that can take on any real value within a specified range. These variables do not take on isolated or countable values but rather exist on a continuum. For example, the height of an individual can be measured with increasing precision—such as 163.5 or 165.25 centimeters—demonstrating that height is a continuous random variable.The behavior of such variables is described using a probability density function (PDF),...
55

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Related Experiment Video

Updated: Jan 31, 2026

Cell-Free DNA Integrity Analysis in Urine Samples
07:58

Cell-Free DNA Integrity Analysis in Urine Samples

Published on: January 5, 2017

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Cell-Free DNA Integrity: Applications.

Sara Ravaioli1

  • 1Biosciences Laboratory, Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori (IRST) IRCCS, Meldola, Italy. sara.ravaioli@irst.emr.it.

Methods in Molecular Biology (Clifton, N.J.)
|December 24, 2018
PubMed
Summary
This summary is machine-generated.

Cell-free DNA integrity (cfDNAi) shows promise as a solid tumor biomarker. A new, standardized real-time PCR method offers a cheap, reproducible tool for evaluating cfDNA integrity, aiding in prognosis and treatment response.

Keywords:
Apoptotic indexBiomarkerIntegrity indexReal-time PCRcfDNA integrity

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Area of Science:

  • Oncology
  • Molecular Biology
  • Biomarker Discovery

Background:

  • Cell-free DNA integrity (cfDNAi) is a potential biomarker for solid tumors, crucial for prognosis and therapy response.
  • Current cfDNAi evaluation lacks standardization, hindering its clinical application.
  • Apoptotic index (AI) and integrity index (II) of cfDNA are explored as prognostic indicators for patient recurrence, progression, or relapse.

Purpose of the Study:

  • To present a standardized, cost-effective, and reproducible method for evaluating cell-free DNA integrity (cfDNAi).
  • To establish a robust tool for cfDNAi analysis suitable for all laboratories.
  • To facilitate the use of cfDNAi as a biomarker in translational oncology research.

Main Methods:

  • Development and validation of a novel cfDNA integrity analysis method.
  • Utilizing real-time PCR instrumentation for cfDNAi quantification.
  • Assessing the reproducibility and cost-effectiveness of the proposed method.

Main Results:

  • A cheap, reproducible, and robust method for cfDNAi analysis was successfully established.
  • The method is performable in any laboratory equipped with a real-time PCR instrument.
  • This standardized approach addresses a critical gap in cfDNAi evaluation.

Conclusions:

  • The developed real-time PCR method provides an adequate solution for cfDNAi analysis.
  • This standardized technique can aid in identifying patients likely to recur, progress, or relapse.
  • The tool supports the advancement of cfDNAi as a valuable biomarker in oncology.