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Regulation of the nitrite transport system in Chlorella fusca Shih. et Krauss

100%

Abdel-Basset R., Ali A. H.

Acta Hydrobiologica

1995

tom 37

nr 4

Uptake of nitrite by C. fusca cells was considerable only in the light. Pre-starvation in the dark or permanent darkness was accompanied by very low rates of nitrite uptake. 2,4 dinitrophenol, an energy metabolism inhibitor, also inhibited nitrite uptake. Nevertheless, it is difficult to assume that nitrite uptake is an active process. Metabolic inhibitors having various targets in plant cell metabolism such as arsenate, cyanide, cyclohexamide and 6.methylpurine also inhibited nitrite uptake. A feedback inhibition of nitrite uptake was observed in the presence of glutamate or glutamine. The addition of NO3- or NH4+ competitively inhibited NO2- uptake. Therefore, NO2- uptake in C. fusca is conditioned by several factors.

Biotic interaction and nutrient competition between Chlorella fusca Shih et Krauss and Ankistrodesmus falcatus [Corda] Ralfs

84%

Issa A. A., Abdel-Basset R. M., Adam M. S.

Acta Hydrobiologica

1994

tom 36

nr 3

323-333

In non-limited nutrient experiments (basal medium + 100 µg Ptot. dm-3 and 2000 µg Ntot. dm-3) the highest production (growth rate, chlorophyll ɑ, dry weight) of Chlorella fusca and Ankistrodesmus falcatus grown in pure cultures was obtained. Similar enhancement of mixed cultures (1:1) was observed despite the production of each one being lower than its own in pure culture. C. fusca requires relatively higher amounts of nitrogen than A. falcatus. However, the uptake of phosphorus by C. fusca was lower than A. falcatus. On the other hand, C. fusca can inhibit the growth of A. falcatus, while A. falcatus somewhat improved the growth of C. fusca.

Ograniczanie wyników

2 Acta Hydrobiologica

1 Abdel-Basset R.

1 Abdel-Basset R. M.

1 Adam M. S.

1 Ali A. H.

1 Issa A. A.

1 1995

1 1994

Wyniki wyszukiwania

Regulation of the nitrite transport system in Chlorella fusca Shih. et Krauss

Biotic interaction and nutrient competition between Chlorella fusca Shih et Krauss and Ankistrodesmus falcatus [Corda] Ralfs