Fluorescence Intensity Analysis
Fluorescence Intensity Analysis - Related Videos
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Cited by 3 •
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Source: Zeigler Allen, L., et al. Isolation and Genome Analysis of Single Virions using 'Single Virus Genomics'. J. Vis. Exp. (2013).This video demonstrates how flow cytometry enables the isolation of individual, genome-containing viruses from mixed populations through fluorescence-based detection and precise particle sorting, followed by agarose embedding for subsequent genomic characterization.
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Sound Intensity
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The loudness of a sound source is related to how energetically the source is vibrating, consequently making the molecules of the propagation medium vibrate. To measure the loudness of a source, the physical quantity of interest is the intensity. This is defined as the energy emitted per unit of time per unit of area perpendicular to the sound wave's propagation direction. Since the total energy is greater if the source vibrates for a longer duration and over a larger area, dividing the emitted...
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Cited by 3 •
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06:27
Automated Analysis of C. elegans Fluorescence Images using SegElegans
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Here we provide instructions on effectively utilizing SegElegans, a deep learning system we developed for the automated segmentation of individual worms in widefield microscopy images, for subsequent use in image analysis software such as ImageJ. We provide ways to use the system both online and offline.
FAQs
Excitation supplies energy that promotes electrons in a fluorophore to a higher state. As those electrons relax, the molecule emits detectable light, and the recorded signal becomes the measurement used for comparison. This sequence matters because changes in emission can arise from altered fluorophore concentration or from a change in the state of an indicator, not necessarily from the same underlying event.
Interpretation depends on whether the fluorescent label or indicator is expected to report abundance, distribution, or activity. An intensity increase can be evaluated as evidence of a changed molecular amount or location when experimental conditions remain controlled, but an indicator’s internal state may also alter emission. Distinguishing these possibilities prevents researchers from treating every brightness difference as a direct concentration measurement.
Exposure, background signal, and photobleaching directly affect how confidently intensities can be compared. Excessive or inconsistent exposure can alter the recorded signal, background can contribute light unrelated to the target, and photobleaching can reduce emission during observation. Controlling these factors helps ensure that an apparent difference more closely reflects the sample or indicator rather than measurement conditions.
A basic workflow begins by selecting the fluorescent molecule, label, or indicator relevant to the question, then exciting it and recording the emitted light under controlled conditions. Researchers compare intensity across cells, regions, or experimental states while accounting for background signal, exposure, and photobleaching. This sequence produces measurements that can be related to abundance, distribution, or indicator activity.
In neuroscience, calcium measurements use changes in fluorescent indicators to follow calcium dynamics across neuronal conditions or locations. The resulting intensity records can reveal changing indicator states associated with neuronal activity, provided exposure and other experimental conditions remain controlled. This makes the method useful for relating optical signals to patterns of cellular response without assuming that every intensity change represents identical molecular information.
Fluorescence Intensity Analysis can map where labeled proteins appear within neural cells by comparing emission across cellular regions. It can also support comparisons of cellular responses when researchers apply the same measurement logic across experimental conditions. Reliable interpretation requires attention to background, photobleaching, exposure, and other controlled conditions, because technical differences could otherwise be mistaken for changes in localization or response.