Violet Light Irradiation
Violet Light Irradiation - Related Videos
03:40
UV Irradiation: A Method to Integrate Extrachromosomal Arrays
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2023
Microinjection of transgenes usually results in C. elegans strains with large extrachromosomal arrays, which result in variable expression and transmission of the transgene. UV Irradiation can induce chromosomal integration of the array and more stable transgene transmission.
04:15
A Mouse Model of Fatigue Induced by Peripheral Irradiation
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Cited by 18 •
2017
We describe a method using targeted peripheral irradiation to induce fatigue-like behavior in mice. The selected non-lethal irradiation dose leads to a week-long reduction in voluntary wheel-running activity.
10:09
Planarian Immobilization, Partial Irradiation, and Tissue Transplantation
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Cited by 20 •
2012
An effective method for grafting tissue of defined and consistent size between planaria is described. Also included is a description of how the immobilization technique used for transplantation can be adapted, in conjunction with lead shields, for the partial irradiation of live animals.
03:19
Inactivation of Bacteria Using Light-Activated Flavin Mononucleotide
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2025
Source: Cheng, C., et al. Inactivation of Pathogens via Visible-Light Photolysis of Riboflavin-5′-Phosphate. J. Vis. Exp. (2022)This video demonstrates a method for evaluating the phototoxic effects of flavin mononucleotide (FMN) on pathogenic bacteria. Bacterial cultures are exposed to increasing concentrations of FMN and illuminated with visible light to generate reactive oxygen species (ROS) that damage cellular components. The surviving bacteria are then quantified to assess the...
03:32
Cresyl Violet Staining of Tissue Sections: A Staining Procedure to Visualize Cartilage and Bones in Frozen Mouse Embryo Sections
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2025
This video describes cresyl violet staining procedure to visualize bones and cartilage in coronal sections of frozen mouse embryos. This staining technique helps to differentiate bones and cartilage with distinct colors from the surrounding tissues.
FAQs
Endogenous chromophores, which are light-absorbing molecules already present in biological materials, capture violet-light photons and initiate photochemical reactions. Under suitable wavelength and dose conditions, these reactions can generate reactive oxygen species. Those chemically reactive molecules may damage microbial components or modify cellular signaling, so chromophore content helps determine whether exposure produces antimicrobial effects or changes in cell behavior.
These variables determine the delivered light dose and influence the balance between biological activity and phototoxicity. Wavelength affects which chromophores absorb the photons, while intensity and exposure duration shape the extent of photochemical reactions. Changing any of them can alter the outcome, making controlled conditions essential when comparing responses among cells, tissues, or microorganisms.
A useful response occurs when light exposure produces the intended change, such as controlling microbial growth or altering a light-responsive cellular process, without causing excessive damage in the biological system under study. Phototoxicity reflects harmful effects associated with unsuitable exposure conditions. Researchers therefore interpret outcomes in relation to wavelength, intensity, duration, and the specific biological context.
Researchers should specify and regulate the wavelength, light intensity, and exposure duration, then interpret the resulting biological response in relation to those parameters. Consistent dose control helps separate effects caused by the irradiation from differences in experimental conditions. This approach is especially important when evaluating microbial damage, cellular signaling changes, or possible phototoxic effects in tissues.
The approach is useful when researchers want to investigate or influence microbial growth through photochemical damage. At suitable wavelengths and doses, absorbed light can promote reactive oxygen species that damage microbial components. Experiments must still account for exposure duration, intensity, and biological context, because conditions that affect microorganisms may also produce unwanted effects in surrounding biological material.
In biology, it can support studies of photobiology, cellular signaling, and light-responsive processes in cells and tissues. By varying irradiation conditions and observing the resulting biological changes, researchers can examine how absorbed photons influence cellular behavior. The method also helps connect specific exposure parameters with outcomes ranging from signaling alterations to damage caused by excessive photochemical activity.