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Experiments performed using Ulva rigida thalli and enriched culture solutions demonstrated that Ulva emits extracellular organic substances the complexity of which can be monitored by synchronous fluorescence spectroscopy. It was found that synchronous peak intensities hA (excitation at 270-280 nm), hB (340-350 nm) and hC (390-400 nm) varies in relation to the age of the thallus and the quality of the emitted substances by the alga. The peak height ratio hA/hB display an inverse relationship with the age of the alga and a direct relationship with the slope of the absorption curves. That occurs since hA, after a first increase, tends to diminish in correspondence to a progressive increase of the peaks hB and hC due to the emission of the more and more complex fluorescent organic substances.

Additional information

Authors: FERRARI G M, JRC Ispra (IT);TARGA C, Universita' di Venezia, Dipartimento di Scienze Ambientali (IT)
Bibliographic Reference: Article: Acqua e Aria (1996)
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