Oxygen isotope fractionation ((18)O/(16)O) at the natural abundance level has been measured during photosynthesis of a blue-green and a green alga. When sufficient attention is paid to removal of contaminating air O(2) before and during the experiments, then the photosynthetic O(2) evolved, as compared to the water O(2), had an average difference of -0.36% for a blue-green alga and -0.80% for a...

Spectral light changes evoke different morphogenetic and photosynthetic responses that can vary among different algae species. The aim of this study is to investigate the photosynthetic characteristics of the red macroalgae grown under different spectrum environments. In this study, Pyropia haitanensis were cultured under blue, red, and green LED and fluorescent tubes light. The growth rate, ph...

Seaweeds are an underutilised nutritional resource that could not only compliment the current western diet but potentially bring additional health benefits over and above their nutritional value. There are four groups of seaweed algae; green algae (Chlorophyceae), red algae (Rhodophycae), blue-green algae (Cyanophyceae) and brown algae (Phaeophyceae). Seaweeds are rich in bioactive components i...

The seas provided a suitable site for the early evolution of all life. Ever since plants and animals developed structures and mechanisms that enabled them to survive on land, terrestrial and aquatic plants have been exposed to different abiotic and biotic selective pressures. Marine plants, which, unlike terrestrial plants, have evolved and adapted to life in a largely stable but saline environ...

Solvent extracts of three different prokaryotic algae from three species of didemnid ascidians contained pigments identified, on the basis of their fluorescence excitation (E)and fluorescence emission (F)spectral maxima (measured in nm) at 77K, as chlorophyll a (E 449, F 678) and chlorophyll b (E 478, F 658). The release of algae on cutting or freezing Diplosoma virens was accompanied by a stro...

The decrease in periodic scouring of pulsed flows regulated rivers can result algal communities dominated by filamentous algae, not available as food sources for fish and macroinvertebrates. To study the flow velocity required to scour benthic algae from natural river beds, removal effects on biomass resistances different species were tested a laboratory flume at velocities 0.8, 1.1, 1.4, 1.7, ...

The high visual quality of lakes bolsters aesthetic and recreational experiences, but little is known about the specific preferences related to mountain lakes. This study therefore aimed at assessing people’s on characteristics using an online questionnaire. Adopting a qualitative approach, we first identified major recognised lakes, i.e., respondents indicated that are typically small-sized wi...

Cyanobacteria, also known as blue-green algae, are photosynthetic bacteria that can colonize different habitats, including extreme ones. They of great interest to the scientific community, especially because their ability produce cyanotoxins: toxic secondary metabolites potentially harmful organisms when released surface waters.