Did Dye
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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...
09:46
Synthesis of Plant Phenol-derived Polymeric Dyes for Direct or Mordant-based Hair Dyeing
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Cited by 12 •
2016
Here, we present a protocol to use pre-synthesized polymeric products derived from fungal laccase-catalyzed polymerization of plant phenols, either with or without mordant agents (e.g., FeSO4), to induce detergent-resistant keratin hair dyeing within 2.5 hours.
04:55
UV-Vis Spectroscopy of Dyes - Concepts
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2020
Absorbance When light interacts with a substance, a portion of the light is absorbed while the rest is either reflected or transmitted through it. Substances that we perceive as having a color reflect light in the visible range. The color of the substance that we are able to see depends on which wavelength of light is reflected. A substance that we perceive as blue reflects light in the blue range (430 – 480 nm) of the visible spectrum. According to the color wheel, the same substance absorbs...
09:52
UV-Vis Spectroscopy of Dyes - Student Protocol
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2020
Source: Lara Al Hariri and Ahmed Basabrain at the University of Massachusetts Amherst, MA, USA Absorbance Wavelength ComparisonExpand In the first part of the lab, you'll use ultraviolet and visible light absorption spectroscopy, or UV-Vis absorption spectroscopy, to analyze the absorption characteristics of fluorescein, β-carotene, and indigo dye. To perform UV-Vis spectroscopy, you'll place a solution between a light source and a photodetector. The molecules will absorb light at...
FAQs
The dye’s hydrophobic carbocyanine structure inserts into the lipid bilayer rather than attaching covalently to a membrane protein. Once positioned in the bilayer, DiD can move laterally within the membrane plane. This mobility allows researchers to follow membrane-associated movement and organization while preserving a readout of membrane behavior in cells or reconstituted model systems.
After excitation, DiD emits red-shifted fluorescence that provides an optical signal for locating labeled membranes. Changes in signal distribution can be used to assess where membranes are positioned and how they behave over time. This makes fluorescence imaging suitable for examining localization and dynamics in cellular or model-membrane experiments.
Because DiD inserts into lipid bilayers without requiring covalent labeling of membrane proteins, it can report membrane behavior without modifying a specific protein target. The resulting signal follows the labeled membrane itself, supporting studies of membrane organization, transport, and movement. This is particularly useful when the experimental question concerns membranes rather than protein identity.
Researchers interpret the location and movement of the fluorescent signal as readouts of membrane distribution and dynamics. Lateral dye mobility can reveal how labeled membrane regions shift within a system, while changes in signal localization can help track transport between cellular or model-membrane compartments. These measurements connect fluorescence patterns with membrane behavior.
A general workflow is to introduce DiD into the membrane system being studied, whether cells, vesicles, liposomes, or another model, and then examine the fluorescent signal by imaging. Researchers can compare signal location or movement over time to evaluate membrane dynamics. The specific interpretation depends on whether the experiment focuses on tracking, transport, fusion, or organization.
DiD is useful when researchers need to follow membrane-associated fluorescence as cells move or exchange membrane material. Imaging can reveal the distribution of labeled membranes across cells and help identify patterns of intercellular transfer. Because the signal reports membrane location rather than requiring a labeled membrane protein, it supports broader tracking of membrane-related events.
In vesicle and liposome experiments, DiD provides a fluorescent membrane signal that can be followed during interactions between model compartments. Fusion assays can use changes in the distribution or dynamics of labeled membranes to examine membrane mixing and related behavior. These reconstituted systems help researchers study membrane processes in a controlled model context.