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PUVA (psoralen and UVA) is an ultraviolet light therapy treatment for skin diseases: vitiligo, eczema, psoriasis, graft-versus-host disease, mycosis fungoides, large plaque parapsoriasis, and cutaneous T-cell lymphoma, using the sensitizing effects of the drug psoralen.
The Langerhans cells may undergo changes in quantity, morphology, and function due to UV exposure and may eventually become depleted. One proposed explanation for this immunosuppression is that the body is attempting to suppress an autoimmune response to inflammatory products resulting from UV damage.
Excessive UV radiation causes sunburn along with other direct and indirect DNA damage to the skin, and the body naturally combats and seeks to repair the damage and protect the skin by creating and releasing further melanin into the skin's cells. With the production of the melanin, the skin color darkens.
Visual phototransduction is the sensory transduction process of the visual system by which light is detected by photoreceptor cells (rods and cones) in the vertebrate retina.A photon is absorbed by a retinal chromophore (each bound to an opsin), which initiates a signal cascade through several intermediate cells, then through the retinal ganglion cells (RGCs) comprising the optic nerve.
Many practical applications, including chemical and biological effects, are derived from the way that UV radiation can interact with organic molecules. These interactions can involve absorption or adjusting energy states in molecules, but do not necessarily involve heating. [citation needed] Short-wave ultraviolet light is ionizing radiation.
Amy Robach knows that T.J. Holmes wants to be the one to pop the question. While answering fan questions on the Dec. 8 episode of their Amy & T.J. podcast, the former GMA3: What You Need to Know ...
Editor's Note for Thursday, Nov. 14: Follow along here for updates on what could become Hurricane Sara. Forecasters with the National Hurricane Center said Wednesday they are tracking a system in ...
The Huffington Post set out to track everyone who died in jails and police lockups across the U.S. since Sandra Bland was found hanged in her cell last July. The Department of Justice tracks these deaths but does not share them due to exemptions in federal public records laws.