title: Energy distribution in the photochemical apparatus of Porphyridium cruentum: Picosecond fluorescence spectroscopy of cells in state 1 and state 2 at 77 K.
abstract: Excitation energy distribution in Porphyridium cruentum in state 1 and state 2 was investigated by time resolved 77 K fluorescence emission spectroscopy. The fluorescence rise times of phycoerythrin, phycocyanin and allophycocyanin (in cells in state 1 and state 2) were very similar in contrast to the emission from chlorophyll a (Chl a) associated with the two photosystems. In state 2 photosystem II (PSII) Chl a fluorescence emission rose faster than the PSI Chl a emission and decayed more rapidly, and the converse was observed in state 1. These kinetic data support the concept of increased energy transfer from PSII Chl a to PSI Chl a in state 2 in P. cruentum.
authors.affiliation: Division of Biology and Medicine, Brown University, 02912, Providence, R.I..
authors.forename: D
authors.initials: D
authors.lastname: Bruce
authors.forename: C A
authors.initials: CA
authors.lastname: Hanzlik
authors.forename: L E
authors.initials: LE
authors.lastname: Hancock
authors.forename: J
authors.initials: J
authors.lastname: Biggins
authors.forename: R S
authors.initials: RS
authors.lastname: Knox