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Two methods (new miniaturized method according to TNV 757741 and standard method were compared. The new method was found comparable with several advantages. The older method can be replaced by the new one without problems or both of them can be used for the same purpose.
Wet stones near the wells form a specific microhabitat for the occurrence of epilithic, benthic and epiphytic cyanobacteria and algae. In four wells (Prosba lesa, U sovy, Čertík, U památníku letců) 15 little known cyanobacteria species (namely from the group of Chroococcales) were identified. These microhabitats belong to oligosaprobic water sites.
This contribution deals with the comparison of several physical and chemical parameters and algae periphyton in the Ostravice River above and below the Šance Reservoir. The Šance Reservoir on the Ostravice River (North Moravia) is a typical deep reservoir with the hypolimnetic outflow during the period of stratification. The reservoir serving as drinking water supply was filled up in 1969. Temperature, pH, conductivity and concentrations of oxygen and nitrogen compounds, as well as the phyto-periphyton changes (focussed on diatoms and assessment of saprobity) were followed in the five profiles on the Ostravice River. Special attention was done on the morphological variability of the diatom species Fragilaria arcus (EHRENBERG) CLEVE. Two profiles studied were located on the reservoir inflows, three below the reservoir dam. The decrease of oxygen concentrations, pH, conductivity and saprobity was observed below the dam. Concerning water temperature, the decrease of summer water temperature values and increase of water temperature in winter were found below the reservoir. While the concentrations of NO2- and NH4+ and the morphological variability of the species Fragilaria arcus were not significantly different in the profiles studied, the NO3- concentrations were higher below the dam.
Problém tolerance se v posledních desetiletích v kontextu procesů globalizace a integrace národnostních menšin jeví jako jeden z klíčových problémů politické teorie. Autorem jedné z nejvlivnějších současných teorií tolerance je pak bezpochyby člen „čtvrté generace“ frankfurtské školy Rainer Forst. Článek předkládá kritickou recepci jeho teorie, lze ho ovšem zároveň chápat jako prostředek k získání obecné systematické a normativní orientace ve struktuře komplexní problematiky tolerance, která v současnosti významně rezonuje ve veřejném prostoru. Výklad za pomoci historických příkladů osvětluje Forstovo rozlišení pojmu a pojetí tolerance a následně se věnuje originálnímu normativnímu ospravedlnění tolerance, s důrazem na Forstem předložená řešení s tímto pojmem spojených paradoxů. Následuje kritické zhodnocení Forstovy argumentace, které poukazuje mimo jiné na obtíže vyplývající z Forstovy návaznosti na tradici liberalismu a konstruktivismu, a tím se dotýká problémů ležících v základech nejen Forstova myšlení, ale v základech těchto myšlenkových směrů vůbec.
Ten genera of cyanophytes and 73 genera of algae were found in the guts of Aedes, Culex, Anopheles and Culiseta larvae collected in various breeding places of the Elbe-Lowland (Bohemia) and Prague. The quality and quantity of blue-green algae and algae found in mosquito guts depended on their presence in the water of mosquito breeding places and on the feeding type (filter fieders, scrapers) of mosquito larvae. Chlorophycean algae possesing cell wall with sporopollenin and algae with a mucilagenous (jelly) envelope appeared undamaged by the digestive process. Also spores and resting stages tended to pass undamaged through the larval intestine tract.
Interlaboratory comparison method for identification of cyanobacteria is proposed. Formalin preserved samples of water blooms or samples collected with plankton net were determined using light microscope. The correct identification of dominant species in each sample was evaluated according to the simple point system. Advantages and disadvantages of this method are summarized.
Diatoms were studied in 29 spring fens of the West Carpathians. A total of 70 diatom taxa were found. Caloneis tenuis, Eunotia paludosa, E. steineckii, Navicula cryptocephala, Nitzschia archibaldii, Rhopalodia gibba and R. rupestris were the most frequent species. The sites with low pH (3,6 – 6,5) can be characterized by the occurrence of genera Anomoeoneis, Eunotia, Frustulia. On the other hand, Rhopalodia and Diploneis were common at the sites with higher pH (6,4 – 7).
Studie představuje "Ost und West" jako programové periodikum liberálně smýšlejících Čechů a českých Němců, které ve 30. a 40. letech 19. století zaujalo specifické místo ve spektru tehdejších časopisů vycházejících na území Čech. Časopis přispíval k rozvoji česko-německého sblížení, k růstu české kultury a poskytoval i hlubší podněty pro další vývoj česky psané literatury, navíc umožňoval díky svému charakteru její prezentaci v zahraničí. Svým demokratickým profilem se pak zařadil na samou špičku českých dobových periodik.
A preliminary floristic survey of aerophytic epiphytic algae from lowland tropical rainforests of Peninsular Malaysia is presented. The algal communities are either dominated by filamentous cyanophytes (e.g. Scytonema, Stigonema) or green algae of the family Trentepohliaceae. As concomitant species of Trentepohliaceae-dominated communities the coccal and filamentous green algae were frequently observed. In cyanophytes-dominated samples green algae were rarely recovered.
In many recorded species the determination up to the species level has not been possible. Some of the isolated strains will be described as new taxa in future.
The significant difference in species composition of investigated samples indicates a huge potential of algal biodiversity in aerophytic biotopes of tropical rainforests.
The seasonal changes of phytoplankton and selected ecological parameters (temperature, pH, oxygen, conductivity, nutrients) were studied in the years 1998 and 1999 at gravel-pit Chomoutov (Olomouc, the Czech Republic). Long-term changes in the species composition and proportions of the main algal groups during last three decades are discussed. Subsequent eutrophication was found with the come back of water blooms of Aphanizomenon flos-aquae.