Abstract
Nonsulfur photosynthetic bacteria (Athiorhodaceae) exhibit a time-variable fluorescence in addition to a constant fluorescence. All species examined show upon aging a remarkable gain in the variable component at the expense of the constant component while the total fluorescence remains essentially invariant. This result can be rationalized by supposing a change in distribution of bacteriochlorophyll in photosynthetic units as cells age. Alternatively, one may assume operation of two photochemical systems—one cyclic and predominant in young cells, the other noncyclic and predominant in old cells. It is also noted that a hitherto unreported minor fluorescence with maximum emission at ∼ 860 nm exists in addition to the well-known main fluorescence band at ∼ 890 nm. The rise in variable fluorescence is associated with the main band, a result in accord with the notion that the bacteriochlorophyll component responsible and absorbing at 870 nm is directly in contact with the energy trap.
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Selected References
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