Sunlight sustains life on earth. Sunlight is essential for vitamin D synthesis in the skin. The sun’s ultraviolet rays can be hazardous, however, because excessive exposure causes skin cancer and other adverse health effects. Skin cancer is amajor public health problem;more than 2 million new cases are diagnosed in the United States each year. Ultraviolet radiation (UVR) causes the 3 major form...

A practical exercise for developing a simple cost-effective solar ultraviolet radiation dosimeter is presented for use by middle school science students. Specifically, this exercise investigates a series of experiments utilising the historical blue print reaction, combining ammonium iron citrate and potassium hexacyanoferrate to develop an ultraviolet sensitive solution. The activity is intende...

Sunlight sustains life on earth. Sunlight is essential for vitamin D synthesis in the skin. The sun’s ultraviolet rays can be hazardous, however, because excessive exposure causes skin cancer and other adverse health effects. Skin cancer is amajor public health problem;more than 2 million new cases are diagnosed in the United States each year. Ultraviolet radiation (UVR) causes the 3 major form...

Sunlight sustains life on earth. Sunlight is essential for vitamin D synthesis in the skin. The sun’s ultraviolet rays can be hazardous, however, because excessive exposure causes skin cancer and other adverse health effects. Skin cancer is amajor public health problem;more than 2 million new cases are diagnosed in the United States each year. Ultraviolet radiation (UVR) causes the 3 major form...

BACKGROUND There are large geographic gradients in mortality rates for a number of cancers in the U.S. (e.g., rates are approximately twice as high in the northeast compared with the southwest). Risk factors such as diet fail to explain this variation. Previous studies have demonstrated that the geographic distributions for five types of cancer are related inversely to solar radiation. The purp...

For more than a century, solar radiation has been known to contribute significantly to the extrinsic aging of skin. Until recently, this was almost exclusively attributed to the photodamage caused by ultraviolet (UV) light. However, a growing body of evidence now indicates that both infrared (IR) and visible light may also contribute to extrinsic skin aging. Infrared radiation, comprised of IR-...

Abstract Skin exposure to solar ultraviolet radiation and pollutants causes several skin disorders, calling for protection methods such as sunscreen application. However, common contains chemicals that have displayed toxicity when exposed radiation. Therefore, alternatives approaches been recently developed, the use of natural phytochemicals active ingredients in photoprotection preparations. H...