Fm 1-43 Dye
Fm 1-43 Dye - Related Videos
06:06
Constructing Mutants in Serotype 1 Streptococcus pneumoniae strain 519/43
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Cited by 2 •
2020
Here, we describe a S. pneumoniae serotype 1 strain 519/43 that can be genetically modified by using its ability to naturally acquire DNA and a suicide-plasmid. As proof of principle, an isogenic mutant in the pneumolysin (ply) gene was made.
08:46
Studying Synaptic Vesicle Pools using Photoconversion of Styryl Dyes
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Cited by 18 •
2010
FM dyes have been of invaluable help in the understanding of synaptic dynamics. FMs are normally followed under the fluorescent microscope during different stimulation conditions. However, photoconversion of FM dyes combined with electron microscopy allows the visualization of distinct synaptic vesicle pools, among other ultrastructure components, in synaptic boutons.
02:43
Microelectrode-Mediated FM Dye Loading and Unloading in Drosophila Larvae Nerve Cells
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2025
In this video, Drosophila larvae nerve fibers are immersed in FM dye, which binds to cell membrane lipids. Suction microelectrode and electrical pulses stimulate the endocytosis process, incorporating the FM dye into newly formed endocytic vesicles. This method, which visualizes presynaptic stages of neurotransmission, is useful for studying synaptic function and neurotransmitter release.
08:36
FM Dyes in Vesicle Recycling
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2023
FM dyes are a class of fluorescent molecules that has found important use in studying the vesicle recycling process. By virtue of a chemical structure, these molecules can insert themselves into the outer leaflet of phospholipid bilayer membranes. After membrane insertion, they are internalized into the cell via endocytosed vesicles, and released when these vesicles recycle back to the membrane. Since, these dyes fluoresce strongly in the hydrophobic environment within membranes and weakly in...
10:30
Dye-sensitized Solar Cells
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2023
Source: Tamara M. Powers, Department of Chemistry, Texas A&M University Today's modern world requires the use of a large amount of energy. While we harness energy from fossil fuels such as coal and oil, these sources are nonrenewable and thus the supply is limited. To maintain our global lifestyle, we must extract energy from renewable sources. The most promising renewable source, in terms of abundance, is the sun, which provides us with more than enough solar energy to fully fuel our...
FAQs
Fluorescence serves as a dynamic proxy for membrane-associated dye. When labeled membrane is retrieved during endocytosis, the signal can increase as dye enters recycling compartments; when vesicles fuse with the plasma membrane during exocytosis, dye can leave the membrane environment and fluorescence decreases. Tracking these opposing changes lets investigators relate stimulation to cycles of vesicle retrieval and release in living cells.
The dye's response to its local chemical environment separates membrane traffic from background signal: aqueous dye contributes little fluorescence, whereas membrane-associated dye contributes strongly. Consequently, movement of labeled membrane into or out of the cell produces an optical change that can be followed over time, making membrane trafficking measurable rather than merely inferred from endpoint secretion.
Stimulation establishes the event against which fluorescence is measured. In neurons and other secretory cells, an activity-dependent signal change can be associated with vesicle exocytosis or endocytosis. Comparing fluorescence before and after stimulation therefore helps connect cellular activation with vesicle turnover, rather than treating fluorescence as a static label. This temporal link is useful for studying regulated secretion.
Researchers use the dye to label plasma membrane or vesicle-associated membrane in living cells, stimulate the cells when appropriate, and monitor fluorescence over time. The resulting signal trajectory is interpreted alongside the stimulation event to assess internalization, dye release, exocytosis, or recycling. This workflow emphasizes dynamic changes rather than a single fixed image.
These cells repeatedly exchange membrane through synaptic or secretory vesicles, creating measurable trafficking events. FM1-43 allows investigators to follow those events in living cells while relating fluorescence changes to activity-dependent exocytosis and endocytosis. In neurons, the approach can illuminate synaptic vesicle recycling; in other secretory cells, it can link stimulation with membrane turnover and secretion.
A trace can provide evidence that membrane has been internalized, released, or recycled in response to cellular activity. It can therefore serve as a readout of vesicle turnover and secretion, rather than simply indicating that dye is present. Interpreting the direction and timing of fluorescence changes helps connect optical measurements with membrane-trafficking behavior.