Carotenoids and pH of the culture medium play an important role in displaying metal stress in batch and semi-continuous cultures ofAnabaena doliolum

Recovery Responses of Freshwater Phytoplankton Assemblage After the Disappearance of Metal Toxicity in Semi-Continuous Cultures

“…On the other hand, microcosms based on a semi-continuous culture system can be very well used to study the effects of metals on algal assemblages under controlled conditions of the laboratory and require the least input. Furthermore, the long-term assessment of the impact of the metal stress on algal populations is easily possible with semi-continuous culture, which does not change the levels of nutrients and pH (Tripathi et al 2003;Tripathi et al 2009). On the other hand, batch cultures suffer from the depletion of nutrients and uctuation in the pH with time (Tripathi et al 2003;Tripathi et al 2009).…”

“…Furthermore, the long-term assessment of the impact of the metal stress on algal populations is easily possible with semi-continuous culture, which does not change the levels of nutrients and pH (Tripathi et al 2003;Tripathi et al 2009). On the other hand, batch cultures suffer from the depletion of nutrients and uctuation in the pH with time (Tripathi et al 2003;Tripathi et al 2009). Further, it has been observed that industrial and domestic e uents very often cause discontinuous or episodic discharge of pollutants, such as metal ions, into receiving water bodies.…”

Potencial das radiações ionizantes para reduzir a toxicidade da cianobactéria Microcystis aeruginosa

“…O resultado foi decorrente do aumento na densidade celular e deficiência de CO 2 dissolvido nas culturas analisadas. Aumento no pH da cultura estática também foi observado quando comparado ao pH de cultura semi-contínua de Dolichospermum doliolum, na qual não foi observado quaisquer oscilações em relação ao pH (TRIPATHI et al, 2009). Nas culturas irradiadas por feixe de elétrons, houve diminuição de pH do meio com o aumento da dose.…”