Fluorescence Phenomenon
Fluorescence Phenomenon - Related Videos
01:10
Tip-of-the-Tongue Phenomenon
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2025
The tip-of-the-tongue (TOT) phenomenon is a cognitive experience characterized by a temporary inability to retrieve specific information from memory despite having a strong feeling of knowing the information. Although individuals cannot access the target word or detail, they frequently recall related elements, such as its initial letter, syllable count, or context. This partial retrieval often causes frustration, as one might recognize a familiar face or know that a name starts with a specific...
12:55
Strategies for Tracking Anastasis, A Cell Survival Phenomenon that Reverses Apoptosis
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Cited by 32 •
2015
The term anastasis refers to the phenomenon in which dying cells reverse a cell suicide process at a late stage, repair themselves, and ultimately survive. Here we demonstrate protocols for detecting and tracking cells that undergo anastasis.
09:22
Introduction to Fluorescence Microscopy
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2023
Fluorescence microscopy is a very powerful analytical tool that combines the magnifying properties of light microscopy with visualization of fluorescence. Fluorescence is a phenomenon that involves absorbance and emission of a small range of light wavelengths by a fluorescent molecule known as a fluorophore. Fluorescence microscopy is accomplished in conjunction with the basic light microscope by the addition of a powerful light source, specialized filters, and a means of fluorescently...
07:45
X-ray Fluorescence (XRF)
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2023
Source: Laboratory of Dr. Lydia Finney — Argonne National Laboratory X-ray fluorescence is an induced, emitted radiation that can be used to generate spectroscopic information. X-ray fluorescence microscopy is a non-destructive imaging technique that uses the induced fluorescence emission of metals to identify and quantify their spatial distribution.
05:00
Fluorescence Anisotropy to Determine Transcription Factor-DNA Binding Affinity
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2025
This video describes high-performance fluorescence anisotropy that helps to monitor the interaction between transcription factors and DNA. The assay monitors the interactions of a fluorophore-labeled DNA molecule with its specific transcription factor by measuring the degree of polarization due to molecular rotation or anisotropy of the fluorophore-labeled DNA.
FAQs
A fluorescent molecule releases only part of the energy it gained from the absorbed photon when it returns from an excited electronic state to a lower-energy state. The remaining energy difference appears as emitted light with a longer wavelength. This shift helps distinguish the emitted signal from the illumination used to excite the sample.
The excited electronic state is a brief intermediate step between photon absorption and light emission. It stores the molecule’s increased energy before the molecule returns to a lower-energy state and releases that energy as light. Because this sequence links absorption with emission, it provides the basis for detecting fluorescently labeled biological structures and molecules.
Fluorescent dyes and proteins can label several levels of biological organization, including whole cells, organelles, nucleic acids, and specific molecules. This range allows fluorescence-based imaging to connect a visible signal with a defined cellular structure or molecular target. Researchers can therefore examine where labeled components occur and relate their location to biological activity.
Fluorescence measurements can convert the presence or behavior of a fluorescent signal into quantitative assay information. Rather than relying only on visual observation, researchers can measure changes associated with labeled biological components or activity. This makes the phenomenon useful for evaluating experimental samples, comparing conditions, and tracking biological changes in a measurable format.
A typical workflow begins by associating a fluorescent dye or protein with the cell, organelle, nucleic acid, or molecule of interest. The sample is then exposed to light or other electromagnetic radiation that the label can absorb, and the resulting emission is observed through fluorescence microscopy or imaging. The recorded pattern provides spatial information about the labeled target.
These methods are useful when researchers need to visualize biological structures, measure activity, examine protein interactions, or follow cellular processes over time. Fluorescence microscopy and imaging provide visualization, while fluorescence measurements support quantitative assays. The same general phenomenon therefore contributes to structural studies, molecular interaction research, flow cytometry, and real-time cellular analysis.