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Density

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...

Current Density

Current Density

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...

Bulk Density of Aggregate

Bulk Density of Aggregate

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.
Most natural mineral aggregates, like sand and gravel,...

Strain-Energy Density

Strain-Energy Density

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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Density and Archimedes' Principle

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...

Applications of the Ideal Gas Law: Molar Mass, Density, and Volume

Applications of the Ideal Gas Law: Molar Mass, Density, and Volume

The volume occupied by one mole of a substance is its molar volume. The ideal gas law, PV = nRT, suggests that the volume of a given quantity of gas and the number of moles in a given volume of gas vary with changes in pressure and temperature. At standard temperature and pressure, or STP (273.15 K and 1 atm), one mole of an ideal gas (regardless of its identity) has a volume of about 22.4 L — this is referred to as the standard molar volume.

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Endoscopic Cholesteatoma Surgery

Endoscopic Cholesteatoma Surgery

Published on: January 19, 2022

Changes in mammographic density following bariatric surgery.

Ava Hosseini¹, Amal L Khoury², Flora Varghese²

¹Department of Surgery, University of California, San Diego, San Diego, CA.

Surgery for Obesity and Related Diseases : Official Journal of the American Society for Bariatric Surgery

|May 12, 2019

Summary

Bariatric surgery may increase mammographic breast density in some women, independent of weight loss. This change in breast density, a risk factor for breast cancer, warrants further investigation despite the surgery

Keywords:

bariatric surgery breast cancer breast density obesity

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Area of Science:

Oncology
Radiology
Metabolic Surgery

Background:

Obesity and high mammographic density are breast cancer risk factors, yet inversely related.
Bariatric surgery reduces breast cancer risk, but its effect on mammographic density is unclear.

Purpose of the Study:

To examine changes in mammographic density following bariatric surgery.
To determine if weight loss correlates with these density changes.

Main Methods:

Retrospective review of 42 patients with pre- and post-operative mammograms after bariatric surgery.
Analysis of body mass index (BMI), weight loss, and Breast Imaging Reporting and Data System (BI-RADS) density.
Statistical analysis using Stata 14.2.

Main Results:

Over one-third of patients experienced a change in mammographic density, with 93.3% showing an increase (P < .001).
The amount of weight loss did not correlate with density changes.
Lower baseline mammographic density was associated with a higher likelihood of density change (P = .02).

Conclusions:

Bariatric surgery can lead to increased mammographic density in some women, irrespective of weight loss.
Metabolic changes from surgery may influence breast tissue independently of BMI reduction.
Further research is needed to understand the implications of these density changes on breast cancer risk.