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Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
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The normal, a continuous distribution, is the most important of all the distributions. Its graph is a bell-shaped symmetrical curve, which is observed in almost all disciplines. Some of these include psychology, business, economics, the sciences, nursing, and, of course, mathematics. Some instructors may use the normal distribution to help determine students’ grades. Most IQ scores are normally distributed. Often real-estate prices fit a normal distribution. The normal distribution is...
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Normal Stress01:19

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Normal stress is a type of stress that occurs when forces act perpendicular, or normal, to a material's cross-sectional area. This stress often arises in structures when subjected to axial loading, which is the application of force along the axis of an object. A practical example of this can be found in bridge truss members.
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Applications of Normal Distribution01:22

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The normal distribution is a useful statistical tool. One of its practical applications is determining the door height after considering the normal distribution of heights of persons, such that many can pass through it easily without striking their heads. The normal distribution can also determine the probability of a person having a height less than a specific height.
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Introduction to Normal Distributions01:29

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Standardized test scores often follow a symmetric distribution that can be modeled with the normal distribution, a fundamental concept in statistics. This distribution is particularly useful for interpreting test performance fairly across populations, as it provides a mathematical framework for understanding variability and central tendency in large datasets.From Histogram to Frequency DistributionRaw test data are often displayed using histograms, where the height of each bar represents the...
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When a beam is subjected to different loads, such as weight, pressure, or other external forces, internal forces are generated within the beam. These forces can have a significant impact on the overall stability and strength of the structure. Engineers use various methods to analyze and determine the magnitude and direction of these internal forces. One common technique used to determine internal forces in beams is the method of sections. This method involves considering an imaginary point or...
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Bladder Smooth Muscle Strip Contractility as a Method to Evaluate Lower Urinary Tract Pharmacology
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A Simple Method for Normalization of Aortic Contractility.

Lexiao Jin1,2, Alexandra Lipinski3,4, Daniel J Conklin2,3,4

  • 1Department of Anesthesiology, Critical Care and Pain Medicine, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China.

Journal of Vascular Research
|July 6, 2018
PubMed
Summary
This summary is machine-generated.

Standardizing vascular contractile function measurements is crucial. A new 2-step normalization method using segment length and volume improves data comparison in vascular disease research.

Keywords:
AortaBlood vesselIsometric contractionMyographyPhenotypic switchVascular smooth muscle

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Area of Science:

  • Vascular biology and physiology
  • Cardiovascular research methods
  • Biomedical engineering

Background:

  • Vascular contractile function assessment in diseases like atherosclerosis lacks standardized quantification methods.
  • Varied approaches (raw values, percentage of control, normalization by vessel characteristics) hinder direct comparison of myography data.
  • This inconsistency limits the reproducibility and generalizability of findings in vascular research.

Purpose of the Study:

  • To develop and validate a simple, universal 2-step normalization method for isometric vascular contractions.
  • To address the lack of uniformity in quantifying vascular contractility across different laboratories and experimental settings.
  • To enhance the comparability and reliability of data generated from isolated blood vessel studies.

Main Methods:

  • A novel 2-step normalization procedure was developed for isolated blood vessel segments.
  • Step 1: Measurement of blood vessel segment length (mm), area (mm2), and calculation of volume (mm3).
  • Step 2: Normalization of isometric contraction force (mN) by the calculated segment length and/or volume.

Main Results:

  • The proposed normalization method demonstrated practical utility and general applicability in differentiating vascular responses.
  • Normalized aortic contractions showed statistically significant differences between normal chow and high-fat diet-fed mice, unlike raw values.
  • This normalization approach effectively reduced variability and enhanced the sensitivity of detecting diet-induced changes in vascular function.

Conclusions:

  • Normalization of isometric aortic contractions to segment length and/or volume is recommended for reduced variability and enhanced efficiency.
  • This standardization fosters universal comparisons across diverse isometric myography platforms, laboratories, and experimental conditions.
  • Adoption of this method will improve the reliability and comparability of vascular contractile function data in scientific literature.