Inhibition of the growth of two blue-green algae species (Microsystis aruginosa and Anabaena spiroides) by acidification treatments using carbon dioxide

When carbon dioxide fixation was over 90 % inhibited by CMU , nitrogen fixation remained unaffected in nitrogen-starved cells of Anabaena cylindrica . In normal cells under the same conditions nitrogen fixation was about 50 % inhibited by CMU . These data suggest, first, that nitrogen fixation in this organism is independent of reducing potential generated by non-cyclic photo-electron transport and, secondly, that nitrogen fixation is stimulated by photosynthetically produced carbon skeletons to assimilate the fixed nitrogen. Although nitrogen fixation occurred to a limited extent in the dark, increasing light intensity stimulated nitrogen fixation both in the presence and absence of CMU . This suggests that light-generated ATP is required for nitrogen fixation in this alga. A ratio of pyruvate decarboxylation to nitrogen fixation of 3:1 has been established for A. cylindrica . This accords with the hypothesis that pyruvate acts as a hydrogen donor for nitrogen reduction and that provision of the required reductant is independent of photosynthesis in blue-green algae.

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Carbon dioxide fixation and biomass production with blue-green algae Spirulina platensis

Studies in Surface Science and Catalysis - Advances in Chemical Conversions for Mitigating Carbon Dioxide, Proceedings of the Fourth International Conference on Carbon Dioxide Utilization ◽

10.1016/s0167-2991(98)80835-5 ◽

1998 ◽

pp. 617-620 ◽

Cited By ~ 3

Author(s):

Satoshi Hirata ◽

Masao Hayashitani

Keyword(s):

Carbon Dioxide ◽

Green Algae ◽

Biomass Production ◽

Spirulina Platensis ◽

Carbon Dioxide Fixation ◽

Blue Green Algae

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Carbon dioxide assimilation in blue-green algae: initial studies on the structure of ribulose 1,5-bisphosphate carboxylase.

Journal of Bacteriology ◽

10.1128/jb.125.2.531-539.1976 ◽

1976 ◽

Vol 125 (2) ◽

pp. 531-539 ◽

Cited By ~ 29

Author(s):

F R Tabita ◽

S E Stevens ◽

J L Gibson

Keyword(s):

Carbon Dioxide ◽

Green Algae ◽

Carbon Dioxide Assimilation ◽

Bisphosphate Carboxylase ◽

Blue Green Algae

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Freeze-Fracture Replication in the Ultrastructure of Blue-Green Algae

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100060386 ◽

1967 ◽

Vol 25 ◽

pp. 74-75

Author(s):

L. V. Leak

Keyword(s):

Cell Wall ◽

Electron Microscope ◽

Green Algae ◽

Three Dimensional ◽

Freeze Fracture ◽

Electron Microscopic ◽

Photosynthetic Membranes ◽

Blue Green Algae ◽

Cell Biol ◽

Cellular Components

Electron microscopic observations of freeze-fracture replicas of Anabaena cells obtained by the procedures described by Bullivant and Ames (J. Cell Biol., 1966) indicate that the frozen cells are fractured in many different planes. This fracturing or cleaving along various planes allows one to gain a three dimensional relation of the cellular components as a result of such a manipulation. When replicas that are obtained by the freeze-fracture method are observed in the electron microscope, cross fractures of the cell wall and membranes that comprise the photosynthetic lamellae are apparent as demonstrated in Figures 1 & 2.A large portion of the Anabaena cell is composed of undulating layers of cytoplasm that are bounded by unit membranes that comprise the photosynthetic membranes. The adjoining layers of cytoplasm are closely apposed to each other to form the photosynthetic lamellae. Occassionally the adjacent layers of cytoplasm are separated by an interspace that may vary in widths of up to several 100 mu to form intralamellar vesicles.

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