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Morphological variation of trichomes, heterocytes and akinetes in four species classified into the nostocalean genera Aphanizomenon Morren ex Bornet et Flahault or Anabaena Bory (Cyanophyta/Cyanobacteria) was studied from natural samples by LM and illustrated by drawings and micrographs. All investigated species, Aphanizomenon gracile (Lemmerm.) Lemmerm.,(More)
Zygospore formation in different strains of the Closterium peracerosum-strigosum-littorale complex was examined in this unicellular isogamous charophycean alga to shed light on gametic mating strains in this taxon, which is believed to share a close phylogenetic relationship with land plants. Zygospores typically form as a result of conjugation between(More)
In order to survive in a highly competitive environment, freshwater or marine phototrophic microorganisms have to develop defense strategies that result in a tremendous diversity of compounds from different metabolic pathways. Recent trends in drug research from natural sources have shown that algae and cyanobacteria are promising organisms to furnish novel(More)
The summer phytoplankton of ultraoligotrophic Lake Hubsugul, Mongolia, was studied in 1985–1989. 24 taxa, mostly belonging to the chlorococcal algae, are illustrated and their main diagnostic features discussed. Two new combinations,Monoraphidium pseudomirabile (Korš.) Hind. etZagor., andOocystella mongolia (Antip.) Hind. etZagor, are created.
of a paper given at the Third lAP Workshop, Seeon 1980 Further observations on chlorococcal algae in natural material and in laboratory cultures are given. The vast majority of the investigated material was collected from aquatic biotopes in the region of the city of Bratislava and in Western Slovakia. Special attention has been paid to small gravel pit(More)
The formation of hormogonia in the nostocalean cyanophytes/cyanobacteria Hapalosiphon fontinalis (C. Agardh) Bornet and Fischerella sp. was studied in natural populations collected from the Klin peatbog, northern Slovakia. Hormogonia were produced terminally in lateral branches of filaments (both species), or also directly on the main branches (Fischerella(More)
Growth requirements of 10 possibly thermophilic strains of cyanobacteria were compared under a wide spectrum of light and temperature conditions (7–80Wm−2, 12–40°C). The strains were isolated from different localities: six of thermal springs in Slovakia (4 from Piešťany, 2 from Sklené Teplice), one from thermal waters in Rupite, Bulgaria, 2 strains from a(More)
In the course of three years' investigations (1983–1986) of Lake Volvi, N Greece, 62 species and varieties of chlorococcal algae and 6 species of ulotrichal algae (Chlorophyceae) were found. Although chlorophytes form the largest group of the phytoplankton assemblages of the lake, their biomass is relatively small or even negligeable in some periods of the(More)
An algal extracellular biopolymer (over 8.5 × 10(5)Da) composed of carbohydrates (52%) and protein (∼13%) has been isolated from a red alga Rhodella grisea growing in natural conditions by concentration of water medium, alcohol precipitation, dialysis and freeze-drying. This mucilagineous biopolymer contained xylose and its 3-O- and 4-O-methyl derivatives(More)