Avidin is a tetrameric biotin-binding protein produced in the oviducts of birds, reptiles, amphibians

Dimeric members of the avidin family are also found in some bacteria. In chicken egg white, avidin makes up approximately 0.05% of total protein (approximately 1800 ÎŒg per egg). The tetrameric protein…

Albumen prints and egg whites…all the rage back in the day…and a few other things

The albumen print, also called albumen silver print, was published in January 1847 by Louis DĂ©sirĂ© Blanquart-Evrard, and was the first commercially exploitable method of producing a photographic print on a paper base from a negative. It used…

p-Phenylenediamine (PPD) is a derivative of aniline used in kevlar, hair dye and henna substitutions among other things, the derivatives of which are used in antiozonants among other horrors

p-Phenylenediamine (PPD) is an organic compound with the formula C6H4(NH2)2. This derivative of aniline is a white solid, but samples can darken due to air oxidation.It is mainly used as a component of engineering polymers and composites…