Fig. 2.

Ultrastructure of the microalga Porphyridium purpureum in presence of copper in the medium. A – control, general view, arrow indicates to mucopolysaccharide envelope; B – control, the location of thylakoids in the chloroplast: arrows indicate to phycobilisomes; C – copper content of 50 μg/L, general view, arrow indicates a mucopolysaccharide envelope; D – copper content of 50 μg/L, the location of thylakoids in the chloroplast: arrows indicate phycobilisomes; E – copper content of 100 μg/L, general view, arrow indicates a mucopolysaccharide mucous envelope; F – copper content of 100 μg/L, the location of thylakoids in the chloroplast: arrows indicate phycobilisomes; G – with a copper content of 150 μg/L, general view; nucleolus is indicated with a short arrow; the long arrow indicates the mucopolysaccharide mucous envelope; H – with a copper content of 150 μg/L, the location of thylakoids in the chloroplast; arrows indicate phycobilisomes. Designations: ch – chloroplast, p – pyrenoid, arrow indicates to mucopolysaccharide mucous envelope, nu – nucleus.