Characterization of Photosynthetic Rhythms in Marine Dinoflagellates I. Pigmentation, Photosynthetic Capacity and Respiration
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There was sufficient similarity between the circadian rhythms of these three dinoflagellates to suggest the mechanism of regulation may be the same for each of them.Abstract:
Circadian rhythms in photosynthesis were defined for the first time in the dinoflagellates Glenodinium sp. (M. Bernard strain) and Ceratium furca Ehrenberg (B. Meeson strain) and compared with that in Gonyaulax polyedra Stein. All three phytoplankton species had photosynthetic rhythms with daily amplitudes ranging from 3 to 5 and maxima displayed about midday. The photosynthetic pigment content and absorption properties of the cells were constant over the circadian cycle. Diurnal periodicities in respiration never accounted for more than 30% of the photosynthetic rhythm and did not persist under constant conditions. There was sufficient similarity between the circadian rhythms of these three dinoflagellates to suggest the mechanism of regulation may be the same for each of them.read more
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References
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Journal ArticleDOI
Studies of marine planktonic diatoms: i. cyclotella nana hustedt, and detonula confervacea (cleve) gran.
TL;DR: Bacteria-free clones of the small centric diatom Cyclotella nana Hustedt were isolated, three from estuarine localities, one from Continental Shelf waters, and one from the Sargasso Sea as mentioned in this paper.
Journal ArticleDOI
An improved cathode for the measurement of photosynthetic oxygen evolution by isolated chloroplasts
T. Delieu,D. A. Walker +1 more
TL;DR: The construction, operation and calibration of an improved form of a Clark oxygen electrode that shows a rapid response to change in oxygen concentration and is capable of measuring rates of oxygen evolution (or uptake) of up to 4 μmoles oxygen per minute is described.
Journal ArticleDOI
Rhythmic Cell Division in Populations of Gonyaulax polyedra
TL;DR: The occurrence of a glow, or steady light emission of low intensity, at about the time ofcell division is described, and it is suggested that this glow may result from cellular changes accompanying certain stages of cell division.
Book ChapterDOI
Circadian periodicities in natural populations of marine phytoplankton
TL;DR: The rhythm of photosynthetic capacity, or Doty and Oguri's rhythm, is identified with the physiologists's “afternoon depression” and its implications on the measurement of primary production are discussed.
Journal ArticleDOI
Quantitative thin-layer chromatography of chlorophylls and carotenoids from marine algae.
TL;DR: Thin layers of specially prepared sucrose were used to separate the chlorophylls and carotenoids of green algae, brown algae, diatoms, dinoflagellates, chrysomonads, and the leaf pigments of higher plants and the pigment components of very small samples of algae may be determined.