Comparative growth of the thermal alga Cyanidium caldarium on nitrate and ammonia at different temperatures
✍ Scribed by Rigano, Carmelo ;Violante, Umberto
- Publisher
- Springer-Verlag
- Year
- 1972
- Weight
- 326 KB
- Volume
- 85
- Category
- Article
- ISSN
- 0003-9276
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✦ Synopsis
The growth of Cyanidium caldarium on nitrate and ammonia as nitrogen sources was studied at different temperatures from 21 to 54~
Algal growth occurred at temperatures of 24~ or above when ammonia was the nitrogen source, whereas with nitrate, growth occurred at 30~ or above. The optimum and the maximum growth temperatures were 45 and 54~ respectively on both substrates.
Arrhenius plots show that the logarithm of the growth rate is not linear with the reciprocal of absolute temperature, but exhibit sharply defined breaks at 30~ on ammonia and at 40~ on nitrate.
It is assumed that below 40 ~ C, when Cyanidium grows on nitrate, the utilization of this substrate represents the master reaction which controls the growth rate of the alga.
Cyanidium caldarium is a thermophilic acidophilic alga which lives