FIG 4.

Effect of AgNO₃ on LH2 complexes in vivo. (A) Absorption spectra of wild-type (WT) cells grown overnight by photosynthesis untreated (Mal, red line) or exposed to 1 mM AgNO₃ (black line) in comparison with LH2-deficient mutant (LH2⁻) cells grown overnight by photosynthesis in malate medium (green line). (B) Spectral analyses of the LH2-deficient mutant cells untreated (Mal, red line) or exposed to 1 mM CdCl₂ (gray line), NiSO₃ (purple line), CuSO₄ (blue line), or AgNO₃ (black line) after they reach an OD₆₈₀ of 2. Spectra were recorded after 20 h of exposure.