Nostoc muscorum
Nostoc
Cyanobacteria
Genetically modified cyanobacterium Nostoc muscorum overproducing proline in response to salinity and osmotic stresses. (1/4)
In the parent Nostoc muscorum an active proline oxidase enzyme is required to assimilate exogenous proline as a fixed nitrogen source. Cyanobacterial mutants, resistant to growth inhibitory action of proline analogue L-azetidine-2-carboxylate (Ac-R), were deficient in proline oxidase activity, and were over-accumulators of proline. Proline over-accumulation, resulting either from mutational acquisition of the Ac-R phenotype, or from salinity-induced uptake of exogenous proline, confirmed enhanced salinity/osmotic tolerance in the mutant strain. The nitrogenase activity and photosynthetic O 2 evolution of the parent were sensitive to both salinity as well as osmotic stresses than of Ac-R mutant strain. In addition, the mutation to Ac-resistant phenotype showed no alteration in salinity inducible potassium transport system in the cyanobacterium. (+info)Studies on poly-beta-hydroxybutyrate synthase activity of Nostoc muscorum. (2/4)
This study compares the PHB synthase activity of Nostoc muscorum, a N(2)-fixing cyanobacterium under control (grown in usual BG-11 medium), nitrogen (N) and phosphorus (P) deprivation and chemoheterotrophic conditions. Specific activity of PHB synthase did not depict significant variations in the latter three types of cultures, except for the control one, where a significantly lower activity was recorded. PHB synthase activity was detected only in the soluble fractions of both the control as well as cells incubated under chemoheterotrophic conditions. A K(m) of 80.2 microM DL-beta-hydroxybutyryl-CoA and V(max) of 197.5 nmol thiobenzoate (TNB) mg protein(-1)min(-1) were observed for the enzyme. PHB synthase remained insensitive to acetyl-CoA, ATP, NADP, NADPH supplementation under in vitro condition. Addition of acetyl phosphate was found to activate the enzyme and the level of activation was dependent on the concentration of acetyl phosphate supplementation. Inhibition of PHB synthase in 2,3-butanedione supplemented cultures and reactivation following acetyl phosphate addition proved the post-translational control of acetyl phosphate over PHB synthase. (+info)Differential patterns of evolution and distribution of the symbiotic behaviour in nostocacean cyanobacteria. (3/4)
(+info)Assessment of Salinity-Induced Antioxidative Defense System of Diazotrophic Cyanobacterium Nostoc muscorum. (4/4)
The present study examines the salinity-induced oxidative damage and differential response of enzymatic and non-enzymatic antioxidants of Nostoc muscorum. As compared to carotenoid content which showed induction the chlorophyll and phycocyanin contents were inhibited after salt stress. Acceleration of lipid peroxidation and peroxide production suggested onset of oxidative damage. The activities of all studied enzymatic antioxidants were significantly increased by salt stress with maximum induction of superoxide dismutase (154.8% at 200 mM NaCl treatment). Interestingly under severe stress condition (250 mM NaCl) ascorbate peroxidase seems to be more crucial than catalase for peroxide scavenging. Among the studied non-enzymatic antioxidants alpha-tocopherol was induced maximally (56.0%), however, ascorbate and reduced glutathione were increased by only 8.9% after 250 mM NaCl treatment as compared to control cells. Therefore, salinity was found to induce antioxidative defense system of N. muscorum. (+info)"Nostoc muscorum" is not a medical term, but a scientific name for a type of cyanobacteria (blue-green algae). It's commonly found in various environments such as freshwater, soil, and on the surface of rocks. While it doesn't have a direct medical definition, some species of cyanobacteria, including certain strains of Nostoc, can produce toxins that may cause health issues if ingested or come into contact with the skin. However, Nostoc muscorum is not typically considered a harmful species in this regard.
Nostoc is not a medical term, but a genus of cyanobacteria (blue-green algae) that can form colonies in various aquatic and terrestrial environments. Some species of nostoc are capable of forming gelatinous masses or "mats" that can be found in freshwater bodies, soils, and even on the surface of rocks and stones.
While nostoc itself is not a medical term, it has been studied in the context of medicine due to its potential health benefits. Some research suggests that nostoc may have anti-inflammatory, antioxidant, and antimicrobial properties, among others. However, more studies are needed to fully understand the potential therapeutic uses of nostoc and its safety for human consumption or use in medical treatments.
Cyanobacteria, also known as blue-green algae, are a type of bacteria that obtain their energy through photosynthesis, similar to plants. They can produce oxygen and contain chlorophyll a, which gives them a greenish color. Some species of cyanobacteria can produce toxins that can be harmful to humans and animals if ingested or inhaled. They are found in various aquatic environments such as freshwater lakes, ponds, and oceans, as well as in damp soil and on rocks. Cyanobacteria are important contributors to the Earth's oxygen-rich atmosphere and play a significant role in the global carbon cycle.
"Nostoc commune" is not a medical term, but a scientific name for a type of cyanobacteria (blue-green algae). It's commonly found in various environments such as freshwater, soil, and on rocks. This organism can form colonies that appear as slimy, dark green or black mats.
While not a direct medical term, certain species of cyanobacteria, including Nostoc commune, can produce toxins that may pose health risks to humans and animals if ingested, inhaled, or contact skin. These toxins can cause various symptoms, such as rashes, nausea, vomiting, diarrhea, and liver damage. However, not all strains of Nostoc commune produce toxins, and the health risks associated with this specific species are relatively low compared to other cyanobacteria.
Nonetheless, it is essential to be aware of potential health hazards when encountering cyanobacterial blooms in recreational water bodies or drinking water sources and follow local guidelines for reporting and managing such incidents.