Figure 2.

Fluorescence emission spectra of chlorophyll a in untreated spinach chloroplasts in presence of compound 23 (R = 5-Br-2-Cl; c = 0, 56, 220, and 431 μM; curves from top to bottom); excitation wave length λ_ex = 436 nm, chlorophyll concentration 10 mg/L (A) and fluorescence emission spectra of aromatic amino acids in suspension of spinach chloroplasts without and with compound 23 (c = 0, 5.9, 11.8, 23.6, 29.5 and 47.2 μM; curves from top to bottom); excitation wave length λ = 275 nm, chlorophyll concentration 10 mg/L (B).