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Related Concept Videos

Moment of Inertia of Compound Objects01:07

Moment of Inertia of Compound Objects

The moment of inertia is a quantitative measure of the rotational inertia of an object. It is defined as the sum of the products obtained by multiplying the mass of each particle of matter in a given body by the square of its distance from the axis. The total moment of inertia for compound objects can be found by determining and adding the moment of inertia of individual components together.
Consider a child of mass (mc) 25 kg standing at a distance (rc) of 1 m from the axis of a rotating...
Density00:56

Density

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...
Density and Archimedes' Principle01:05

Density and Archimedes' Principle

When a lump of clay is dropped into water, it sinks. But if the same lump of clay is molded into the shape of a boat, it starts to float. Because of its shape, the clay boat displaces more water than the lump and experiences a greater buoyant force, even though its mass is the same. The same holds true for steel ships. The average density of an object majorly determines if the object will float. If an object's average density is less than that of the surrounding fluid, it will float. The reason...
Rolling Resistance01:21

Rolling Resistance

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Composite Bodies00:55

Composite Bodies

A composite body is a body made up of multiple parts, connected to form a larger, unified object. Each part has its own weight and center of gravity, which must be considered to determine the center of gravity of the composite body. In cases where the density or specific weight is constant, the center of gravity coincides with the centroid.
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Mass Moment of Inertia: Problem Solving01:13

Mass Moment of Inertia: Problem Solving

Knowing how to determine the moment of inertia in a wheel's axle can be invaluable in engineering and automotive applications. It provides an understanding of how changes in geometry, mass, and radius can impact its performance.
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Related Experiment Video

Updated: Jul 14, 2026

Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas
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Calcification density in single and twin placenta villi.

Maggie Guess1, Sheila Criswell1

  • 1Department of Diagnostic and Health Sciences, University of Tennessee Health Science Center, Memphis, TN, USA.

Journal of Histotechnology
|September 10, 2025
PubMed
Summary

Placental calcifications, common in third-trimester pregnancies, do not differ between singleton and twin placentas. This suggests calcifications are a normal maturational process, not a sign of fetal distress.

Keywords:
Gestationpregnancyvon Kossa

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Area of Science:

  • Obstetrics and Gynecology
  • Developmental Biology
  • Pathology

Background:

  • Placental calcifications are common in aging placentas and have been linked to fetal distress.
  • Understanding calcification in different pregnancy types is crucial for accurate interpretation.

Purpose of the Study:

  • To compare calcification densities in singleton, fused twin, and non-fused twin placentas.
  • To determine if placental calcifications indicate fetal distress or normal maturation.

Main Methods:

  • Analysis of 139 placental tissues (singleton, fused twin, non-fused twin) from the third trimester.
  • Quantification of calcification density using the von Kossa stain for calcium salts.

Main Results:

  • No significant differences in calcification densities were found among the different placental types.
  • Nearly all third-trimester placentas examined exhibited calcifications.

Conclusions:

  • Placental calcifications in the third trimester appear to be a normal maturational process.
  • Twin pregnancies do not show increased placental stress due to calcifications.
  • Findings may reassure patients and providers managing twin pregnancies.