What this work is about, in plain words
How fast can the diatom Cylindrotheca closterium grow if it is given more nutrients? The authors grew it on media with different nutrient concentrations and found how productivity depends on how "rich" the medium is.
Cylindrotheca closterium is a marine diatom that accumulates valuable substances: the pigment fucoxanthin and polyunsaturated fatty acids. At the time of the study, there were almost no data on how it grows in a dense (intensive) culture: cells were usually counted rather than biomass. The authors set out to determine how culture productivity depends on the concentration of nutrients in the medium.
The culture was grown in batches on the standard marine medium F and on variants of it in which all nutrients were increased proportionally several times, up to a twentyfold concentration.
According to the authors, the richer the medium, the higher the productivity. At first growth rises in direct proportion to the concentration, then the relationship levels off. The highest productivity, 1.54 g of dry weight per liter per day, was obtained on the medium with the twentyfold concentration.
The work shows how much the growth of this diatom can be accelerated simply by enriching the medium. Later works by the authors build on it, including the development of a special nutrient medium.
Limitations. These are laboratory batch experiments. The composition of the biomass on different media was not studied in the article.