dark and deep, but the shallow, sunlit edges are where most of the cichlids live. Brown or green Eretmodus algae scrapers, covered with blue spots, thrive among the breaking waves; the turbulent water pushes their rounded backs onto the rock surfaces instead of pulling them off. These fish nip algae off the rocks with their chisel-like teeth. Their neighbors the Tanganicodus insect pickers also...

photosynthetic systems. I t seems as if the blue-green bacteria are a key intermediate in the development of photosynthesis and also in the development of the 2Fe ferredoxins, possibly from ferredoxins containing a 4Fe4S centre. This last point is also interesting in that it has now been shown that the 2Fe-2s centre is formally derivable from the 4Fe4 s centre in analogue compounds that have be...

........................................................................................................................................................ ii Acknowledgements ...................................................................................................................................... iii List of Figures ........................................................................

The phycobiliproteins of the blue-green algae Synechococcus sp. and Aphanocapsu sp. were characterized with respect to homogeneity, isoelectric point, and subunit composition. Each of the biliproteins consisted of two different noncovalently associated subunits, with molecular weights of about 20,000 and 16,000 for phycocyanin, 17,500 and 15,500 for allophycocyanin, and 22,000 and 20,000 for ph...

Algae can tolerate a broad range of growing conditions but extreme conditions may lead to the generation of highly dangerous reactive oxygen species (ROS), which may cause the deterioration of cell metabolism and damage cellular components. The antioxidants produced by algae alleviate the harmful effects of ROS. While the enhancement of antioxidant production in blue green algae under stress ha...

1. In Chroococcus a quantum of light absorbed by phycocyanin has 90 per cent the chance of doing photosynthesis that a quantum absorbed by chlorophyll has. 2. By a process analogous to internal conversion in radioactivity (but with the linear dimensions and the wave length 10(4) times larger) there will be transferred from phycocyanin to chlorophyll See PDF for Equation (a number of the order o...

Within the euphotic zone of oceans and lakes, planktonic algae are exposed to concurrent changes in irradiance and spectral quality Most models of photoadaptations, however, consider only the effects of machance. Using a factorial expenmental design, this study evaluated the influence of irradiance and spectral quality on the chemical composition, and rates of carbon uptake, polymer synthesis a...

Unpredictable poisonings of livestock and wildlife by waterblooms or scums of freshwater cyanophytes (cyanobacteria) occur when toxic strains of the common spe.cies dominate composition sufficiently to provide above-threshold levels of phycótoxins by susceptible animals. Known phycotoxins from freshwater cyanophytes are alkaloids, polypeptides or pteridines. New toxins produced by new strains h...