Figure 7
From: Freshwater microalgae harvested via flocculation induced by pH decrease
Microscopic pictures of microalgal cells: controlled cells: a) Chlorococcum nivale ; b) Chlorococcum ellipsoideum ; c) Scenedesmus sp . ; cells heated at 121 and incubated in 1% Evans’ blue solution for 3 h: d) Chlorococcum nivale ; e) Chlorococcum ellipsoideum ; f) Scenedesmus sp . ; cells flocculated by adjusting pH value of growth medium to 0.5 with nitric acid and incubated in 1% Evans’ blue solution for 3 h: g) Chlorococcum nivale ; h) Chlorococcum ellipsoideum ; i) Scenedesmus sp . ; cells flocculated by adjusting pH value of growth medium to 3.5 with nitric acid and incubated in 1% Evans’ blue solution for 3 h: j) Chlorococcum nivale ; k) Chlorococcum ellipsoideum ; l) Scenedesmus sp .