That portion of the electromagnetic spectrum immediately below the visible range and extending into the x-ray frequencies. The longer wavelengths (near-UV or biotic or vital rays) are necessary for the endogenous synthesis of vitamin D and are also called antirachitic rays; the shorter, ionizing wavelengths (far-UV or abiotic or extravital rays) are viricidal, bactericidal, mutagenic, and carcinogenic and are used as disinfectants.
    

concept

Humane destruction of rats and mice / by C.W. Hume.

Squamous cell carcinoma, mouse eye

UVP : Ultra Violet Products : Ultra Violet Products Ltd, Science Park, Milton Road, Cambridge CB4 4FH, England.

An old lady asking her doctor about 'Violet Ray', referring to ultra violet rays. Reproduction of a drawing after H.M. Brock, 1925.

Leaf, Turkey Oak (Quercus cerris)

The influence of ultra-violet rays on industrial output / by A. Lisle Punch and Russell Wilkinson with the collaboration of R. StC. Brooke and C.S. Myers.

Raggi ultravioletti : rivista mensile di terapia ultravioletta.

Ultraviolet reflections : life under a thinning ozone layer / Annika Nilsson.

The benefits of lifetime photoprotection : proceedings of the Photoprotection Workshop sponsored by Procter & Gamble (H&BC) Ltd., held in Sydney on 14th June 1997 / edited by J. Gray & J.L.M. Hawk.

Ultraviolet Rays

Images

Catalogue

The influence of ultra-violet rays on industrial output / by A. Lisle Punch and Russell Wilkinson with the collaboration of R. StC. Brooke and C.S. Myers.

Raggi ultravioletti : rivista mensile di terapia ultravioletta.

Ultraviolet reflections : life under a thinning ozone layer / Annika Nilsson.

The benefits of lifetime photoprotection : proceedings of the Photoprotection Workshop sponsored by Procter & Gamble (H&BC) Ltd., held in Sydney on 14th June 1997 / edited by J. Gray & J.L.M. Hawk.

Be sunsmart : cut your cancer risk / Cancer Research UK.