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Various labeling techniques such as enzymatic labeling, protein labeling, and genetic labeling are widely utilized. Ethidium bromide , fluorescein and green fluorescent protein are common tags. The most commonly labelled molecules are antibodies, proteins, amino acids and peptides which are then used as specific probes for detection of a ...
FluoProbes dyes that have comparable excitation and emission spectra to standard fluorophores such as fluoresceins, rhodamines, cyanines Cy2/3/5/5.5/7, are claimed to solve limiting issues observed in some applications such as too high background, insufficient polarity, photobleaching, insufficient brightness, or pH-sensitivity.
SNAP-tag reaction scheme. SNAP-tag® is a self-labeling protein tag commercially available in various expression vectors. SNAP-tag is a 182 residue polypeptide (19.4 kDa) that can be fused to any protein of interest and further specifically and covalently tagged with a suitable ligand, such as a fluorescent dye.
More generally they are covalently bonded to macromolecules, serving as a markers (or dyes, or tags, or reporters) for affine or bioactive reagents (antibodies, peptides, nucleic acids). Fluorophores are notably used to stain tissues, cells, or materials in a variety of analytical methods, such as fluorescent imaging and spectroscopy .
A simplified Jablonski diagram illustrating the change of energy levels.. The principle behind fluorescence is that the fluorescent moiety contains electrons which can absorb a photon and briefly enter an excited state before either dispersing the energy non-radiatively or emitting it as a photon, but with a lower energy, i.e., at a longer wavelength (wavelength and energy are inversely ...
A cyanobacterium stained green with cyanine dye. Cyanine dyes are used to label proteins, antibodies, peptides, nucleic acid probes, and any kind of other biomolecules to be used in a variety of fluorescence detection techniques: flow cytometry, microscopy (mainly the visible range, but also UV and IR), microplate assays, microarrays, as well ...
The Alexa Fluor family of fluorescent dyes is a series of dyes invented by Molecular Probes, now a part of Thermo Fisher Scientific, and sold under the Invitrogen brand name. Alexa Fluor dyes are frequently used as cell and tissue labels in fluorescence microscopy and cell biology . [ 1 ]
LifeAct peptides have been used as a universal marker for F-actin visualization in biomedical research. An experiment conducted by Sawant et al. utilized LifeAct GFP to visualize the migration of control border cells in the ovaries of Drosophila flies, in order to determine how cells move in terms of small and large collectives during development and cancer. [6]
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