Gifted species - biological nitrogen-fixation, Biology

Gifted Species - Biological Nitrogen-Fixation

Biological nitrogen fixation remains mainly confined to a few distinct nutritional types of prokaryotes, some of which are free-living while others live in symbiotic association with eukaryotic partners. This process contributes annually about 6O% to the earth's newly fixed nitrogen budget. Table shows the ranges and types of biological nitrogen fixers. They have been variously classified as free living or symbiotic (Rhizobium-legume association). Free-living can further be classified into phototrophic (Nostoc), chemotrophic (Klebsiella), aerobic (Azotobacter) or anaerobic (Chromatium) depending upon the state of existence and mode of nutrition. Agronomically the most important nitrogen fixing systems are Rhizobium-legume association, Frankia (actinorhiza1)-woody plant association, Anabaena-Azolle and Cyanobacteria-rice system. Rhizobium-legume association as you will know invariably occurs in the form of root nodules.

Table: Examples of Gifted Species

7_Gifted Species - Biological Nitrogen-Fixation.png

Posted Date: 1/17/2013 4:51:42 AM | Location : United States







Related Discussions:- Gifted species - biological nitrogen-fixation, Assignment Help, Ask Question on Gifted species - biological nitrogen-fixation, Get Answer, Expert's Help, Gifted species - biological nitrogen-fixation Discussions

Write discussion on Gifted species - biological nitrogen-fixation
Your posts are moderated
Related Questions
What is Radioactivity ? Radioactivity :  Some isotopes, called radioisotopes, have unstable nuclei that release high energy particles or radiant energy, or both. An example

Define Rheology and syneresis Rheology:   the science of the deformation and flow of matter. It is the branch of physics concerned with the flow and change of shape of matter,

Staphylococcosis The disease is caused by the ingestion of preformed toxin released by Staphylococcus aureus. Epidemiology: Staphylococci grow in meat, dairy and bakery prod

Characteristics of Soil Profile  The profile characteristics studied in the field consist of locating the soil hor izons (based on its colour description that includes the  col

Enzyme Inhibition In living organisms, shuttle intermediate compounds along directed pathways,enzymes catalyze reactions, and provide control over biological procedures. Whethe

Q. What is a nutrient? A nutrient is every substance used in the metabolism and which is obtaining from the diet. For example, essential amino acids and vitamins are nutrients.

Q. What are the main cellular functions of potassium? Moreover being important for the osmotic regulation and for the acid-base equilibrium (pH) potassium is fundamental for th

Explain the Bioavailability of Vitamin D? The nutritional availability of vitamin D is less significant because it can be endogenously produced and retained for long periods by

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Question 1 Write short note on inflammatory response 2 Give an account of attenuated vaccines 3 What is innate immunity? Explain its characteristic features 4 What adjuvants? E