Related Experiment Video
Updated: May 4, 2026

Coupling Carbon Capture from a Power Plant with Semi-automated Open Raceway Ponds for Microalgae Cultivation
Published on: August 14, 2020
Acetylene reduction by Rhodospirillaceae from the Aswan High Dam Lake
A A Shoreit1, M H Abd-Alla, M S Shabeb
1Department of Botany, Faculty of Science, University of Assiut, Assiut, Egypt.
Abstract:
Potential nitrogen-fixing freshwater photosynthetic bacteria of 32 isolates from the Aswan High Dam Lake were investigated using the acetylene reduction technique to ascertain the magnitude of their contribution of fixed nitrogen to the ecosystem. The superior nitrogen-fixing Rhodospirillaceae wereRhodocyclus gelatinosus andRhodomicrobium vannielii followed byRhodobacter capsulatus, Rhodopseudomonas viridis andRhodopseudomonas palustris. High and moderate nitrogenase activities (534 to 1528 nmol ethylene produced/4 ml/h) were found in 56% of the isolates, while the remainder showed low activities (76 to 477 nmol ethylene produced/4 ml/h).
Related Concept Videos
Anoxygenic Photosynthesis
Anoxygenic Phototrophic Bacteria
Acid Mine Drainage
Bioremediation
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Nitriles to Amines: LiAlH4 Reduction
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...

