TABLE 1.

Size and nature of objects observed and discussed in Rsp. photometricum membranes

Object	Size (nm)	Nature
Membrane fragments	200–500 nm	Photosynthetically competent membrane fragments isolated from the bacterium
Paracrystalline LH2 domains	20–150 nm	Regions of hexagonally packed LH2
Mixed domains	200–500 nm	Disordered regions of membrane containing a constant mixture of 3.5 LH2/core complex
Core complex	11.5 nm	Annular complex composed of a reaction center surrounded by 16 LH1 αβ heterodimers, large rings
LH2	7.5 nm	Annular complex of 9 LH2 αβ heterodimers, small rings
Quinone	0.5 nm	Lipid soluble electron carrier ubiquinone10