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Related Concept Videos

Beams01:30

Beams

1.9K
Beams are integral components of structural engineering and construction, designed to support loads applied at various points along their length. These long, straight members can be classified based on geometry, cross-section, support type, and equilibrium condition.
Based on geometry, beams can be straight, tapered, or curved. Straight beams are the most common type and have a constant cross-section throughout their length. Tapered beams, on the other hand, have a varying cross-section along...
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Deflection of a Beam01:19

Deflection of a Beam

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Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
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Density00:56

Density

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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...
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Prismatic Beams: Problem Solving01:15

Prismatic Beams: Problem Solving

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In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
The design begins with analyzing the beam as a free body to identify moments and force balances, thereby determining support reactions. Next, the...
477
Principal Stresses in a Beam01:11

Principal Stresses in a Beam

741
In prismatic beams subject to arbitrary transverse loading, It is essential to analyze the interaction between shear forces and bending moments in order to understand stress distribution and ensure structural integrity. The highest normal or bending stress occurs at the outer fibers of the beam, decreasing linearly to zero at the neutral axis. In contrast, shear stress peaks at the neutral axis and diminishes toward the outer surfaces.
Analyzing principal stresses is crucial, especially in...
741
Beams with Symmetric Loadings01:15

Beams with Symmetric Loadings

420
The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
The M/EI...
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Related Experiment Video

Updated: Feb 4, 2026

Density Gradient Ultracentrifugation for Investigating Endocytic Recycling in Mammalian Cells
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Mammalian cell culture density determination using a laser through-beam sensor.

Sarah M Rue1, Paul W Anderson1,2, Jessica M Miller1

  • 1Genomics Institute of the Novartis Research Foundation, San Diego, CA 92121, USA.

Biotechniques
|October 5, 2018
PubMed
Summary

A new flask density reader (FDR) device automates cell density measurements for high-throughput protein expression. This noninvasive system enhances efficiency and reduces contamination risk in mammalian cell cultures.

Keywords:
automationcell countingcell culturecell densitylasermammalianspectrophotometry

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Area of Science:

  • Biotechnology
  • Cell Biology
  • Proteomics

Background:

  • High-throughput protein expression is crucial for research and biotherapeutics.
  • Current methods for monitoring cell density are often time-consuming and increase contamination risk.

Purpose of the Study:

  • To develop and integrate an automated device for rapid, noninvasive cell density determination.
  • To improve the efficiency and safety of mammalian cell cultures in high-throughput protein expression platforms.

Main Methods:

  • Development of a flask density reader (FDR) using a through-beam laser and sensor.
  • Integration of the FDR onto an automated protein expression platform.
  • Spectrophotometric determination of cell densities in suspension mammalian cell cultures.

Main Results:

  • The FDR enables rapid, noninvasive, and fully automated cell density measurements.
  • Integration onto the automated platform streamlines the protein expression workflow.
  • Reduced need for manual flask sampling minimizes culture contamination risks.

Conclusions:

  • The flask density reader significantly enhances the automation and efficiency of high-throughput protein expression.
  • This device offers a valuable tool for optimizing mammalian cell culture processes.
  • The FDR contributes to safer and more time-effective protein production workflows.