František Hindák

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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)
This paper presents data on the diversity of cyanobacteria and algae of nine gravel pit lakes situated within the city boundaries of Bratislava, W Slovakia. During more than 30 years of investigations 187 genera and 591 infrageneric taxa were determined, of which 40 genera and 58 species belong to Cyanobacteria, and 147 genera, 492 species, 2 subspecies, 35(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)
The rare unicellular rhodophytePorphyridium griseum has been collected and isolated from basins, fed with thermal water, in Piešstany, Czechoslovakia. This is the first report ofP. griseum sinceGeitler's find in the Neusiedler See, Austria. Ultrastructural investigations of the new strain demonstrate thatP. griseum belongs to the closely related(More)
The paper includes data on rare occurring pseudofilamentous freshwater red alga, Chroodactylon ornatum (C. Agardh) Basson, in Poland and Slovakia, Central Europe. The species is classified as widespread in the whole world in littoral of stagnant waters or in rivers but rarely noted. Original microphotographs and drawings of Ch. ornatum are presented.
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 filamentous green algae investigated (Hormidium sp. strainHindák 1963/21,Ulothrix sp. strainHindák 1964/2,Uronema gigas Visch. strainVischer/Bloom. 174,Uronema sp. strainHindák 1963/25 andStigeoclonium sp. strainHindák 1964/1), contain similar amounts of proteins, lipids, cellulose and ash as the hitherto used production strains of the generaChlorella(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.
The morphologies of 15 rare chlorococcalean algae, i.e. three species of the Characiaceae [Hydrianum crassiapex Korshikov, H. viride (Scherffel) H. Ettl, Characiellopsis skujae (Fott) Komárek], four taxa of the genus Pediastrum Meyen [Pediastrum privum (Printz) E. Hegewald, P. duplex Meyen var. rugulosum Raciborski, P. angulosum (Ehrenberg) ex Meneghini,(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)