Sunlight activates vitamin D in the skin.
Spritz the lemon juice mixture into damp hair, then sit outside in the sun for 30 minutes, as the sunlight activates the citric acid.
Following ebb tides, organic matter concentrates through evaporation and adsorption on the ground particles, and becomes activated by sunlight (formation of activated nucleotides, dinucleotides, phosphorylated amino acids, phosphorylated sugars, phospholipids).
He went to his office and quickly discovered that it contained a carcinogen activated by sunlight.
Wendy's massive surface area, over 5,000 sq ft (465 sq m), was coated with titanium nano-particles that essentially sucked pollution out of the air - activated by sunlight, when CO2 adhered to the surface and was washed away as a neutral element by rain water.
The mass-produced tiles, created by Berlin-based architecture firm Elegant Embellishments, are coated with titanium dioxide, a pigment that can act as a catalyst for chemical reactions when it's activated by sunlight.
By having more pheomelanin pigment than eumelanin, fairer-skinned humans were better able to synthesize vitamin D, a process that's activated by sunlight and is crucial to bone formation.
In the 1970s and 1980s, scientists found that CFCs were leaking out of appliances and working their way up toward clouds over the Antarctic, where they would interact with the ozone layer when activated by sunlight and eat away at it, causing the ozone layer to become dangerously thin.
Therefore, studies on the development of new TiO2 wherein its photocatalytic activity can be activated by visible light which is the major part of sunlight will be valuable for field application.
