Calothrix elenkenii was evaluated for accumulation of chlorophyll, beta-carotene and phycobiliproteins when grown under light-dark cycles and darkness, in the presence of glucose. Highest values of beta-carotene, chlorophyll, proteins and acetylene-reducing activity were recorded when the organism was grown in the presence of glucose under light-dark cycles after 15 d of incubation. The presence of glucose in the medium stimulated pigment production, especially of beta-carotene and chlorophyll, which may be due to increased energy-linked assimilation and ATP production. The photoheterotrophic potential of C. elenkenii can be exploited in value addition for increased and economic production of pigments.

• MeSH
• Acetylene metabolism   MeSH
• Adenosine Triphosphate biosynthesis   MeSH
• beta Carotene analysis   biosynthesis   MeSH
• Pigments, Biological biosynthesis   MeSH
• Time Factors MeSH
• Chlorophyll analysis   biosynthesis   MeSH
• Energy Metabolism MeSH
• Glucose metabolism   MeSH
• Kinetics MeSH
• Oxidation-Reduction MeSH
• Pigmentation physiology   MeSH
• Cyanobacteria cytology   metabolism   MeSH
• Light * MeSH
• Light-Harvesting Protein Complexes analysis   biosynthesis   MeSH
• Darkness * MeSH
• Publication type
• Journal Article MeSH
• Research Support, Non-U.S. Gov't MeSH
• Names of Substances
• Acetylene MeSH
• Adenosine Triphosphate MeSH
• beta Carotene MeSH
• Pigments, Biological MeSH
• Chlorophyll MeSH
• Glucose MeSH
• Light-Harvesting Protein Complexes MeSH

An effect of various physico-chemical parameters on nitrogenase-catalyzed oxygen-free hydrogen production by Nostoc muscorum was demonstrated. More hydrogen was produced in the light than in the dark. Optimum temperature was 40 degrees C Various sugars increased hydrogen production whereas on easily metabolized nitrogen sources it was inhibited. The production was sensitive to salinity and Fe3+, Cu2+, Zn2+ and Ni2+ ions. Ultrastructural study revealed many electron-dense layers outside the cell-wall area that have not been observed earlier.

• MeSH
• Nitrogen metabolism   MeSH
• Microscopy, Electron MeSH
• Culture Media MeSH
• Nitrogenase metabolism   MeSH
• Hydrogen Peroxide metabolism   MeSH
• Cyanobacteria growth & development   metabolism   ultrastructure   MeSH
• Light MeSH
• Temperature MeSH
• Carbon metabolism   MeSH
• Publication type
• Journal Article MeSH
• Research Support, Non-U.S. Gov't MeSH
• Names of Substances
• Nitrogen MeSH
• Culture Media MeSH
• Nitrogenase MeSH
• Hydrogen Peroxide MeSH
• Carbon MeSH