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Jun 1, 2021 · As light photons penetrate deeper into the skin, the following outcomes may take place: 1) photons may be diffusely reflected; 2) photons may penetrate the skin layers (directly transmitted light), which is dependent on the wavelength (see panel B for better visualization); 3) photons may be dissipated as heat energy. B) Skin layers, cell types ...
- Leonardo Vinicius Monteiro de Assis, Paulo Newton Tonolli, Maria Nathalia Moraes, Maurício S. Baptis...
- 2021
Skin, the body’s largest organ, is our main interface with the external environment. It senses, responds to, and protects against the elements, including pathogens, toxins, and solar radiation. The cells in our skin respond to light in a multitude of ways, many of which we are still learning about.
The retinal-dependence and involvement of G-proteins in the UVA pathway makes it tempting to speculate that the skin, similar to the eye, uses retinal-bound opsin receptors to respond to light. Here we review recent findings related to the expression and function of opsins in skin cells, particularly focusing on elucidating the elusive roles of opsin 3 (OPN3).
Although UV energy has played an important role in the origin and evolution of life, UV absorption by the skin not only triggers mechanisms that defend skin integrity and regulate global homeostasis but also induces skin pathology (e.g., cancer, aging, autoimmune responses). These effects are secondary to the transduction of UV electromagnetic energy into chemical, hormonal, and neural signals ...
The power (energy/second) of light delivered to a unit of surface area. Watts/meter 2: Fluence (dose) The amount of energy delivered to a unit of surface area over a given time. Fluence = irradiance x time. Joules/meter 2: Duration of exposure: The amount of time that the skin is exposed to light. Seconds: Pulse width
Feb 14, 2015 · UV rays can cause damage to our skin ranging from a light tan to sunburn to harmful skin cancers. ... Instead of becoming very reactive when hit by UV light, melanin releases the extra energy as ...
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Jun 17, 2014 · UV light–sensing mechanisms in skin and the tanning response. UVA and UVB light both independently initiate a cascade of signaling events that lead to hyperpigmentation of skin.
