photochemically

The halogens are normally present as reservoir species (primarily hydrogen chloride – HCl, chlorine nitrate – ClONO2, and bromine nitrate), which are efficiently converted into photochemically active species in the presence of sulfate aerosols or polar stratospheric clouds [9].

Factors affecting arctic ozone variability in the Arctic 2009

Vitamin D is produced photochemically IN the skin from 7-dehydrocholesterol not an “oil”.

Vitamin D-bate D-bunked | The Blog of Michael R. Eades, M.D. 2009

Ultraviolet radiation is the most photochemically reactive wavelength of solar energy reaching the surface of the earth, and has a broad range of effects on aquatic biogeochemistry, biota, and ecosystems.

Ultraviolet radiation effects on freshwater ecosystems in the Arctic 2009

Ozone is produced photochemically from precursor molecules released during the burning of forests and grasslands.

AP Environmental Science Chapter 19- First-Order Effects 2008

I had some vague suspicions that it might not be a good idea to use a compound as photochemically unstable as biacetyl in food.

Hot Buttered James Killus 2008

Benzene itself is almost dead, photochemically speaking; put it into a smog chamber and it mostly just sits there, making a little tang of phenol after a while, but phenol is deader still, so…boring.

Hot Buttered James Killus 2008

Isoprene is 2-Methyl-1,3-butadiene, photochemically a highly reactive organic compound, owing to the two reactive olefinic groups double carbon-carbon bonds in its structure:

Isoprene James Killus 2007

Isoprene is 2-Methyl-1,3-butadiene, photochemically a highly reactive organic compound, owing to the two reactive olefinic groups double carbon-carbon bonds in its structure:

Archive 2007-08-01 James Killus 2007

The structure shows the precise arrangement in the L and M subunits of the photochemically active groups – two chlorophyll molecules forming a dimer, two monomeric chlorophylls, two pheophytin molecules (these lack the central magnesium ion of chlorophyll), one quinone molecule, called

The Nobel Prize in Chemistry 1988 1988

The knowledge about the location of the photochemically active groups in the reaction center has resulted in a deeper understanding of the mechanism of the primary reaction in photosynthetic organisms.

The Nobel Prize in Chemistry 1988 1988