photosystem

(redirected from PS I)

photosystem

(ˈfəʊtəʊˌsɪstəm)
n
(Botany) botany either of two pigment-containing systems, photosystem I or II, in which the light-dependent chemical reactions of photosynthesis occur in the chloroplasts of plants
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
PS is a hit because its crinkly feel conveys the idea of freshness to the consumer.
"Everything about blown PS is more difficult," notes the president of a machinery company that has supplied PS blown-film die heads and air rings under secrecy agreements but has never built a whole PS line.
Clean waste PS is delivered from state and local government offices, including packaging foam from General Motors Corp., egg and meat trays from a Pennsylvania supermarket, and public drop-off.