## Abstract Visible light of moderate intensity (1200 ftβcd) can severely inhibit cell division of a nonβphotosynthetic mutant of __Euglena gracilis__ when growth is supported by butanol, ethanol, or fumarate as sole carbon source. The degree of inhibition is pH dependent, being greatest at pH 4 to
Influence of culture pH on photo-inhibition of division in Euglena gracilis
β Scribed by J. R. Cook
- Publisher
- John Wiley and Sons
- Year
- 1971
- Tongue
- English
- Weight
- 296 KB
- Volume
- 78
- Category
- Article
- ISSN
- 0021-9541
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β¦ Synopsis
In the dark, growth rates of Euglena gracilis were independent of culture pH between the limits of three to eight. Visible light of moderate intensity inhibited growth rates, with the degree of inhibition being markedly pH dependent. The most severe inhibition was observed at pH 4 to 5 , with little or no inhibition at pH 3 or above pH 6.8 a t the light intensity used (400 footcandles),
π SIMILAR VOLUMES
Euglena gracilis Klebs (Z) was grown axenically and autotrophically in four-liter serum bottles at 25Β°C on an aerated, continuously stirred, inorganic salt medium. Four fluorescent illumination regimes were employed: ( 1 ) continuous bright light of 3500 lux (I&); ( 2 ) COntinuOuS dim light of 800 l
A model is presented which describes the influence of inhibition on photosynthesis as afunction of time and light intensity. The model parameters can be estimated from p vs I curves determined by means of a n incubator. Daily production computed with this model is compared with that calculated using