The chlorophyll a fluorescence properties of Gonyaulax polyedra cells before and after transfer from a lightdark cycle (LD) to constant dim light (LL) were investigated. The latter display a faster fluorescence transient from the level ‘I’ (intermediary peak) to ‘D’ (dip) to ‘ P (peak) than the former (3 s as compared to 10 s), and a different pattern of decline in fluorescence from ‘I’ to ‘D a...

(1) The intensity dependence and spectral variations during the fast transient of chlorophyll a (Chi a) fluorescence have been analyzed in the blue-green alga Anacystis nidulans. (Unlike the case of eukaryotic unicellular green or red algae, the fast fluorescence induction characteristics of the prokaryotic blue-green algae had not been documented before.) (2) Dark adapted cells of Anacystis ex...

in order to study the role of photosynthetic tissues on grain filling and remobilization of stem reserves under terminal drought, a pot experiment as semi-field was conducted as two-factor factorial in complete randomized design with three replicates at research farm of agriculture college of vali – e – asr university of rafsanjan during january to june 2012 . first factor was source strength r...

Die Anzucht der Blaualge Anacystis nidulans erfolgte wie bereits beschrieben4. Die Messung der Photosynthese-Aktivität erfolgte in W a r b u r g Gefäßen in 0,1-m. Phosphatpuffer pn 8,0 und Algen mit einem Chlorophyllgehalt von 0,05 mg bei 30 ^C; die Alkyl-benzimidazole wurden in 0,1 ml Methanol zugegeben. Nach Äquilibrierung mit 8% COa/Luft wurde mit 45 000 Lux (Philips Attralux Lampen) belicht...

The intensity of the "steady-state" fluorescence of "aerobic" Anacystis nidulans is variable under prolonged illumination with orange (590 mmu) or blue (440 mmu) light for both normally photosynthesizing and DCMU-poisoned cells. In general, orange light illumination causes an increase of the fluorescence intensity followed by a decrease, while blue light causes an increase until a steady level ...

(Z. Naturforsch. 30 c, 489—498 [1975]; received March 3/April 18, 1975) Primary Photosynthetic Electron Transport, Computer Simulation, Fluorescence Induction, Oxygen Exchange Transient A computer model describing the “Z-scheme” of photosynthetic electron transport in terms of reduction and oxydation of coupled redox pools was built up. Starting from a certain initial state corresponding to the...