Algae calcareous

Biogenic A. Calcareous B. Siliceous >30 >30 48 Foraminifera, coccoliths, calcareous algae, molluscs, bryozoa, and corals 14 Diatoms and radiolaria... 

Among algal specimens two calcareous algae, P. opuntia and Jania sp. tentatively coded as type-1, were toxic to mice. However, the... 

In coral reefe, the density of animal life, stemming not only fi om reef-building scleractinian corals and calcareous algae but also from non-reef-building soft corals, ascidians, bryozoans, soft seaweeds. 

Chalk consists almost entirely of calcite. formed principally by shallow-water accumulation of (l) calcareous tests of floating microorganisms and (2) comminuted remains of calcareous algae. The most widely distributed chalks are of Cretaceous age. as exemplified by the cliffs on both sides of the English Channel. Although an unallered deposit, chalk masses may contain nodules of chen and pyrite. 

Several lines of evidence indicate that carbonic anhydrase is related to calcification in two possible ways (1) as a simple catalyst of C02 hydration, and (2) as a protector of fixed calcium at the nucleation site. The idea has even been advanced that in calcareous algae photosynthesis is the driving force in carbonate deposition by consuming C02 molecules from an intracellular pool of bicarbonate. 

Paul, V. J., Secondary metabolites and calcium carbonate as defenses of calcareous algae on coral reefs, Proc. 8th Int. Coral Reef Symp., 1, 707, 1997. 

Hogberg, H. E., Thompson, R. H., and King, T. J., The cymopols, a group of prenylated bromohyd-roquinones from the green calcareous alga Cymopolia barbata, J. Chem. Soc. Perkins I, 1696, 1976. 

Neumann A.C. and Land L.A. (1975) Lime mud deposition and calcareous algae in the Bight of Abaco, Bahamas A budget. J.. Sediment. Petrol. 45, 763-786. 

Weber J.N. and Kaufman J.W. (1965) Brucite in the calcareous algae Gonolithon. Science 149, 996-997. 

M. I. Bilan and A. I. Usov, Polysaccharides of calcareous algae and their effect on the calcification process, Russ. J. Bioorg. Chem., 27 (2001) 2-16 (English translation from Bioorg. Khim., 27 (2001) 4-20). 

To be precise, the word coral has no formal meaning in taxonomic science, but was originally used to describe any organic material which grew attached to the sea floor, and possessed a hard skeleton. Thus it covered calcareous algae and other creatures, as well as coelenterates - some of which are the animals today considered to be corals . 

Lee D. and Carpenter S. J. (2001) Isotopic disequilibrium in marine calcareous algae. Chem. Geol. 172, 307-329. 

Riding R. and Voronova L. (1982) Recent freshwater oscillatorian analogue of the Lower Paleozoic calcareous alga Angulocellularia. Lethaia 15, 105-114. 

Linge, H., 1999, Isotopic studies of some northern Noj wegian speleothems and calcareous algae from Svalbard. Unpublished Ph.D thesis. Geologic Institute, University of Bergen, Norway. 

Bbhm, E.L., 1969. Calcification in the Calcareous Alga Halimeda opuntia (L) (Chloro-phyta, Udoteaceae). Ph.D. thesis. University of the West Indies. 

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