Journal of The School of Marine Science and Technology,Vol.2 No.3
Effects of Formaldehyde on the Marine Microalga
Nannochloropsis Oculata ST-3 Strain
Kosuke YOSHIDA, Hiroshi ISHII, Yukio KOBAYASHI and Hiroshi SAITO
Abstract
In this study, effects of formaldehyde on the marine microalga Nannochloropsis oculata ST-3 strain were
investigated.Increasing concentrations of formaldehyde caused increased growth retardation of the ST-3 strain.This
is especially seen in the growth curve of the ST-3 strain exposed at 10ppm formaldehyde for the first time which
showed a lag phase for 9 days.However the growth curve of the ST-3 strain exposed at 10ppm formaldehyde for the
2nd time showed a lag phase only for 2 days.Therefore,the ST-3 strain may have adapted to formaldehyde at 10ppm.
Concentrations of formaldehyde in the medium decreased with growth of the ST-3 strain. Concentration of
formaldehyde in the ST-3 strain was also low.Therefore,it is possible that formaldehyde moved into the ST-3 strain
and then reacted with free amino group which existed in the ST-3 strain and formed imine.