Fluorescent Dye Visualization
Fluorescent Dye Visualization - Related Videos
10:53
Visualizing the Live Drosophila Glial-neuromuscular Junction with Fluorescent Dyes
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Cited by 5 •
2009
We described structural features of the Glia-neuromuscular synapses in a novel Inside-out tissue preparation of live fly larvae using fluorescent dyes with confocal microscopy. We labeled live neuron terminals with fluorescent primary antibodies to HRP, and also visualized the perisynaptic space with fluorescent Dextrans.
07:56
Visualizing Mitophagy with Fluorescent Dyes for Mitochondria and Lysosome
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Cited by 4 •
2022
Mitophagy is the primary mechanism of mitochondrial quality control. However, the evaluation of mitophagy in vivo is hindered by the lack of reliable quantitative assays. Presented here is a protocol for the observation of mitophagy in living cells using a cell-permeant green-fluorescent mitochondria dye and a red-fluorescent lysosome dye.
04:19
Visualizing Astrocyte Morphology Using Fluorescent Dye Iontophoresis in a Fixed Mouse Brain Slice
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2025
Source: Moye, S. L., et.al. Visualizing Astrocyte Morphology Using Lucifer Yellow Iontophoresis. J. Vis. Exp. (2019). This video demonstrates the use of fluorescent dye iontophoresis to study astrocyte morphology in fixed brain slices. It details the piercing of the astrocyte soma with an electrode to deliver an anionic, hydrophilic dye into the cytoplasm under a low-voltage current, enabling the dye to diffuse and label the soma and branches. Confocal microscopy is then used to visualize the...
05:09
Delivery of a Fluorescent Dye into the Subretinal Space of a Mouse
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2025
Source: Parikh, S., et al. An Alternative and Validated Injection Method for Accessing the Subretinal Space via a Transcleral Posterior Approach. J. Vis. Exp. (2016)This video demonstrates the procedure for delivering a fluorescent dye into the subretinal space of a mouse. The process involves anesthetizing the mouse, preparing the eye, making precise incisions to access the subretinal space, and injecting the dye to create a controlled retinal detachment. This technique allows for targeted...
04:47
Retrograde Labeling of Drosophila Motor Neurons Using Fluorescent Lipophilic Dyes
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2025
Source: Inal, M. A. et. al., Retrograde Tracing of Drosophila Embryonic Motor Neurons Using Lipophilic Fluorescent Dyes. J. Vis. Exp. (2020)This video demonstrates the method of retrograde labeling of Drosophila motor neurons using lipophilic dyes. The dye enters the axon, travels retrogradely, and labels the neurons green, allowing detailed visualization of their morphology and projections under a confocal microscope.
FAQs
A fluorophore first absorbs light at an excitation wavelength and then releases lower-energy light at a longer emission wavelength. Optical filters or specialized detectors separate the emitted signal from the illumination used to excite it. This wavelength difference allows the microscope to capture labeled structures while reducing confusion between the incoming light and the fluorescent signal.
The choice of fluorescent label determines which biological feature becomes visible. In biology, dyes can mark cells, organelles, nucleic acids, proteins, or other targets, allowing researchers to examine their location and compare their distribution. This target-specific approach helps reveal cellular organization that may be difficult to distinguish without labeling.
Fluorescent signals connect a visible image with the location of a labeled biological target. By examining where signals occur and comparing them within a sample, researchers can investigate cellular organization and molecular interactions. The same visual information can also support studies of cell function and developmental or disease-related changes.
A typical workflow begins by selecting a fluorescent dye suited to the biological target, followed by applying the label to the sample. The labeled material is then illuminated at the appropriate excitation wavelength, and emitted light is collected through optical filters or specialized detectors. Researchers can subsequently inspect the image or use it for quantitative analysis.
Researchers may choose this approach when a structure, molecule, or process is difficult to distinguish directly. Labeling creates a detectable signal associated with the selected target, making localization and comparison more practical. In biology, this is useful for examining cells, organelles, nucleic acids, proteins, and other features within organized cellular samples.
Fluorescent images can show where selected targets are located and how their distributions compare within a sample. Beyond visual inspection, the signals can support imaging-based quantification, helping researchers analyze cellular organization in a more measurable way. These outcomes are relevant to investigations of cell function, development, disease, and molecular interactions.