2.3. Measurement of growth
Growth of Anabaena PCC 7120 was analysed in terms of dry weight. The 100 ml of untreated and treated cultures were centrifuged (4000 g) for 10 min and the pellets obtained were washed 2-3 times with double distilled water. Thereafter, filamentous pellets of each set were oven dried at 80 °C for 48 h and further after cooling weighed in a digital balance (Contech- CA 223, India).