Microalga are of high relevance for the global carbon cycling and it is well-known that they are associated with a microbiota. However, it remains unclear, if the associated microbiota, often found in phycosphere biofilms, is specific for the microalga strains and which role individual bacterial taxa play. Here we provide experimental evidence that Chlorella saccharophila, Scenedesmus quadricau...

Two freshwater and two marine alg;tl species were grown in intensive contiimous cultures at a fixed dilution rate of 0.5 ·day -I, but at varying pH levels in the range 7.6 to 1C.6. Both freshwater species, Scenedesmus obliquus (Turp.) Kutz. and Chlorella vulgaris Beij., grew up to pH 10.6 although C. vulgaris was more adversely affected by alkaline pH than was Scenedesmus obliquus. Of the marin...

To examine the adaptation of bacterioplankton communities in the Southern Ocean to various biopolymeric substrates, we carried out experiments at the Polar Front and in the Antarctic Coastal Current (CC) in which samples were enriched with agarose, starch, peptone and extracts of the green alga Scenedesmus acutus and diatoms from the Polar Front. Growth and metabolic activity were assessed base...

Harvesting of microalgae Scenedesmus sp. (strain A1) using the natural polymer chitosan was investigated. Different chitosan concentrations, i.e., 10, 20, 40, 60 and 80 ppm were used in the pH range 6 to 10 and cultural cell densities values equivalent to 1, 2 and 3 abs680. Without the addition of chitosan, the increase in pH of the culture led to limited cell sedimentation. The addition of chi...

1 Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden, 2 Alfred-Wegener-Institut Helmholtz-Zentrum für Polarund Meeresforschung, Biologische Anstalt Helgoland, Helgoland, Germany, 3 Ecology and Biodiversity, Department Biology, Vrije Universiteit Brussel, Brussels, Belgium, 4 Departments of Aquatic and Terrestrial Ecology, Netherlands Institute of Ecology (NIOO-KNAW),...

a Department of Biology, Swarthmore College, Swarthmore, PA, USA b Department of Migration and Immuno-ecology, Max Planck Institute for Ornithology, Radolfzell, Germany c Department of Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, OH, USA d Evolutionary Physiology Group, Max Planck Institute for Ornithology, Seewiesen, Germany e Department of Biology, Unive...

2-[Methyl-(3-phenylpropionyl)amino]-benzoic acid (1e) was isolated from a culture of marine Streptomyces sp. strain B7747. Analogous compounds have potential importance as phytotoxic substances, hence compound 1e and the analogues 1a approximately 1d and 1f approximately 3a were synthesised. Antimicroalgal activity of the anthranilamide analogues showed that esters 1b, 1f and 2b were more activ...

Most kinds of phytoplankton are good food for mosquito larvae. However, Culex, Aedes and Anopheles larvae fail to develop successfully in water where certain species of closely related green algae in the order Chlorococcales are the main source of food; apparently because the larvae are unable to digest them. Many species of Scenedesmus, Kirchneriella, Dactylococcus, Elakotothrix, Tetrallantos,...

one of the most important aims of aquatic hatcheries is availability to mass produce of daphnia magna as a live food with high nutritional value in the shortest time. in the present study, d. magna fed with two freshwater green algae species, chlorella sp. and scenedesmus obliquus, enriched with different dosages of a mixture b group vitamins (0, 0.5, 1 and 2 ml.l-1) were compared at two stages...