A partial structure for the toxin BE-4 from the blue-green algae, Microcystis aeruginosa

1983 ◽  
pp. 652 ◽  
Author(s):  
Sitthivet Santikarn ◽  
Dudley H. Williams ◽  
Richard J. Smith ◽  
Stephen J. Hammond ◽  
Dawie P. Botes ◽  
...  
Keyword(s):  
Microcystis Aeruginosa ◽  
Green Algae ◽  
Partial Structure ◽  
Blue Green Algae

Blue-green Algal Ammonia Uptake in Hypertrophic Prairie Lakes

1981 ◽  
Vol 38 (9) ◽  
pp. 1040-1044 ◽  
Author(s):  
T. P. Murphy ◽  
B. G. Brownlee
Keyword(s):  
Microcystis Aeruginosa ◽  
Green Algae ◽  
Nitrogen Cycle ◽  
Nitrogen Limitation ◽  
Kinetic Studies ◽  
Blue Green Algae ◽  
Ammonia Uptake ◽  
Green Algal ◽  
Prairie Lakes ◽  
Menten Kinetic

Within 24 h of an increase in lake [Formula: see text] concentration, [Formula: see text] uptake by Aphanizomenon flos-aquae and Microcystis aeruginosa increases much beyond the capacity predicted by Michaelis–Menten kinetic studies. In hypertrophic lakes this response enables these blue-green algae to optimize ammonia uptake during large oscillations of [Formula: see text] concentration, to aid them in competing with other algae, and to conserve [Formula: see text] within the ecosystem. Nitrogen limitation in the hypertrophic prairie lakes is a rare event.Key words: ammonia uptake, prairie lakes, nitrogen limitation, nitrogen cycle

Occurrence of Toxin Producing Cyanobacteria in Hungary. Isolation, Separation and Identification of Microcystins

1997 ◽  
Vol 52 (1) ◽  
pp. 107-109 ◽  
Author(s):  
Gerhard G. Habermehl ◽  
Hans Chr. Krebs ◽  
Péter Nemes ◽  
Gábor Nagy ◽  
Pál Scheiber
Keyword(s):  
Toxic Effect ◽  
Microcystis Aeruginosa ◽  
Green Algae ◽  
Mass Spectroscopy ◽  
Blue Green Algae ◽  
Cell Material ◽  
Toxin Content ◽  
Dry Cell

Cyanobacteria (blue-green algae), Microcystis aeruginosa sp., were isolated from a massive bloom in a eutrophic waterbody in Hungary. Their toxic effect, determined by a mouse test, was associated with the occurrence of microcystins YR and LR which were isolated, separated by means of HPLC procedures and identified by mass spectroscopy. The toxin content of the dry cell material is about 0.22 %, indicating a pronounced toxin-producing ability of the species investigated

Chelating agents and blue-green algae

1974 ◽  
Vol 20 (10) ◽  
pp. 1311-1321 ◽  
Author(s):  
Willy Lange
Keyword(s):  
Microcystis Aeruginosa ◽  
Green Algae ◽  
Chelating Agents ◽  
Algal Species ◽  
Anacystis Nidulans ◽  
Water Soluble ◽  
Nostoc Muscorum ◽  
Artificial Agents ◽  
Blue Green Algae ◽  
Anabaena Circinalis

Many planktonic blue-green algae produce natural chelators which enable them to grow at high pH's in the absence of artificial chelators. The growth of 10 cyanophytes without an added chelator was found to differ widely with the algal species. Bacteria-containing cultures of Anabaena cylindrica, Anacystis nidulans, Lyngbya sp., Microcystis aeruginosa, Nostoc muscorum, and Phormidium foveolarum produced their own chelators and grew just as well as the controls with artificial chelating agents. Bacteria-containing cultures of Anabaena circinalis, Gloeotrichia echinulata, Oscillatoria rubescens, and Aphanizomenon flos-aquae did not produce chelators and, in the absence of artificial agents, grew poorly or perished early. The alga-produced, extracellular chelators were water-soluble and capable of chelating and controlling metal compounds that would exist in colloidal form at pH's above 7. Accordingly, in the absence of artificial chelators, the non-chelator-forming species grew in the filtrates of the chelator-forming algae the same as in the presence of artificial agents. Bacteria were not involved in the formation of natural chelators, since axenic cultures of Anabaena circinalis, Anacystis nidulans, Microcystis aeruginosa, Nostoc muscorum, and Phormidium foveolarum in the absence of artificial chelators performed about the same as the bacteria-associated species. Also, the filtrates of axenic, chelator-forming Anacystis cultures had the same growth-stimulating effect on non-chelator-forming species as filtrates from bacteria-associated cultures. The natural chelators showed partial thermolability.While the growth of chelator-forming species in the absence of artificial chelators was normal during the logarithmic phase, a peculiar, continuing production of total organic matter was observed with strongly declining cell numbers of Lyngbya, Microcystis, and Phormidium. The terminal cultures of these species were gelatinous, owing to the presence of extracellular matter, probably consisting of polysaccharides.

Biotic Interactions between Different Species of Algae

Weed Science ◽  
1973 ◽  
Vol 21 (1) ◽  
pp. 32-37 ◽  
Author(s):  
Claude E. Boyd
Keyword(s):  
Microcystis Aeruginosa ◽  
Green Algae ◽  
Biotic Interactions ◽  
Blue Green Algae ◽  
Inhibition Of Growth ◽  
Oscillatoria Rubescens

Species of green algae seldom grew as well in two-species cultures with other green algae, or with blue-green algae, as when cultured alone. Several species of algae apparently excreted one or more substances into the medium which inhibited the growth of the second species. Inhibition of growth of green algae was particularly great in two-species cultures with the blue-green algae,Oscillatoria rubescensDecandolle,Anabaena flos-aquae(Lyngbye) Breb.,Microcystis aeruginosaKutz., andCoccochloris peniocystis(Kutz.) Dr. and Daily. Green algae also failed to grow at normal rates in media prepared from filtrates of water from ponds which contained blooms of blue-green algae. Inhibitory substances are apparently an important factor in the development and persistence of relatively unialgal blooms of various species.

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