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  • 1
    Electronic Resource
    Electronic Resource
    Archives of microbiology 112 (1977), S. 179-185 
    ISSN: 1432-072X
    Keywords: Movement ; Phototaxis ; Carbon dioxide tension ; pH ; Circadian rhythm ; Chlamydomonas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract 1. The effects of carbon dioxide, oxygen and pH on the inversion intensity of phototaxis of Chlamydomonas reinhardtii have been investigated. 2. With decreasing CO2 tension the inversion intensity is decreased. 3. The gassing with CO2 can be substituted by hydrogencarbonate only to a small extent (20%). On the other hand, the effect of decreasing CO2 tension can be prevented also only in part by adjusting the pH to about 6.5–7.0. Thus the effect of CO2 on the inversion intensity of phototaxis is obviously a compostite of a true CO2 effect and an effect of the concomitant pH change. 4. Oxygen has only a slight effect. In presence of oxygen (air) the phototactic reaction values are somewhat lower than in its absence. 5. Under certain conditions circadian rhythms seem to be initiated by changing oxygen as well as CO2 tensions. 6. Based on these results some contradictory results of older investigations are discussed.
    Type of Medium: Electronic Resource
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