p. 53 - 80

UTILIZATION OF THE PRINCIPAL TROPHIC ANIONS BY THE 
MARINE UNICELLULAR ALGAE AS A FUNCTION OF THE SPECIFIC 
ENVIRONMENTAL CONDITIONS



Pia-Elena Mihnea and Iulia Voinescu

Romanian Marine Research Institute Constanta

Abstract
The results of the experiments on the utilization of trophic anions
N (-NO3,-NO2) and P(-PO4) by the unicellular algae Cyclotella caspia 

GRUN. and Chaetoceros simplex var. calcitrans PAULS. are presented in
this paper. The dependence of the influx-efflux phenomena on the 
specific temperature of the synthesis process of the two organisms,
as well as on the total salt gradient value in the medium  is thought.
The ability of the algae to take part in the processes of the nitrogen
state modification is discussed, together with the form of nitrogen
storage in the cells.