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Related Concept Videos

Framing Effects03:26

Framing Effects

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Information is everywhere and its presentation—such as how and when items are presented—can impact our perceptions and decisions surrounding the info. This broad concept umbrellas framing effects—influences that occur due to the way information is framed in its appearance, whether it’s purely the order or the specific wording of a message. Let’s take a look at numerous ways in which two versions of something can objectively say the same thing, yet we respond in...
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Frames01:30

Frames

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Frames are essential components of various mechanical and structural systems used daily. These structures are known for their stability and ability to bear heavy loads. A frame is constructed using two-force and multi-force members, interconnected using pin joints. In contrast, trusses are made entirely of two-force members.
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Frames: Problem Solving II01:26

Frames: Problem Solving II

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Consider a hydraulic hoist supporting a load of 1 kN. Assuming a simplified schematic representation of this frame structure, the force acting on BD and BF members can be determined.
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Frames: Problem Solving I01:24

Frames: Problem Solving I

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Consider a jib crane with an external load suspended from the pulley. The dimensions of the crane members are shown in the figure. A systematic analysis of the frame structure is required to determine the reaction forces at the pin joints, assuming that the pulleys are frictionless.
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Confocal Fluorescence Microscopy01:16

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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
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Inertial Frames of Reference01:03

Inertial Frames of Reference

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Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with...
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Related Experiment Video

Updated: Feb 3, 2026

Excitation-Scanning Hyperspectral Imaging Microscopy to Efficiently Discriminate Fluorescence Signals
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Excitation-Scanning Hyperspectral Imaging Microscopy to Efficiently Discriminate Fluorescence Signals

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Line excitation array detection fluorescence microscopy at 0.8 million frames per second.

Chris Martin1, Tianqi Li2, Evan Hegarty2

  • 1Department of Biomedical Engineering, The University of Texas at Austin, 107 W Dean Keeton St., Austin, TX, 78712, USA.

Nature Communications
|October 31, 2018
PubMed
Summary

High-speed fluorescence imaging is crucial for biological research. Line Excitation Array Detection (LEAD) microscopy achieves 0.8 million frames per second, enabling blur-free flow cytometry and cellular imaging.

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Area of Science:

  • Biophotonics and advanced imaging techniques.
  • Microscopy and live-cell imaging.

Background:

  • High-speed, 3D fluorescence imaging is essential for applications like flow cytometry and neuronal activity monitoring.
  • Current methods are limited to kHz frame rates due to photon budget, camera readout speed, and laser scanning limitations.

Purpose of the Study:

  • To develop a novel high-speed fluorescence imaging method.
  • To overcome the frame rate limitations of existing imaging technologies.
  • To demonstrate the utility of the new method in biological applications.

Main Methods:

  • Introduction of Line Excitation Array Detection (LEAD) fluorescence microscopy.
  • Utilizing a chirped signal-driven longitudinal acousto-optic deflector for 0.8 MHz line-scanning, creating a virtual light-sheet.
  • Employing a linear photomultiplier tube array for imaging, generating 66x14 pixel frames per scan cycle.

Main Results:

  • Achieved unprecedented frame rates of 0.8 million frames per second.
  • Implemented LEAD microscopy as a blur-free flow cytometer for Caenorhabditis elegans moving at 1 m/s.
  • Demonstrated 3.5-µm resolution and signal-to-background ratios exceeding 200.

Conclusions:

  • LEAD fluorescence microscopy offers a significant advancement in high-speed imaging capabilities.
  • The method enables blur-free, high-resolution imaging of dynamic biological processes.
  • Future iterations of LEAD microscopy hold potential for even higher resolutions and pixel densities without sacrificing speed.