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
1. Explain the challenges and advantages of having internal gills over external gills for gas exchange? 2. Explain how increased stress levels can affect hormones which ultimate

Q. Illustrate Temporal digital subtraction radiography? Temporal digital subtraction radiography (SR) is a radiographic technique that enable two radiographs made at different

What are some of the things scientists may do to analyze data? They may use statistics to determine relation- ships among variables, compare the data with those obtained in ot

How different are the actions of antibodies against bacteria and against virus? Why is the cellular immune response activated in case of chronic viral infection? The antibodies

Q. Wound Botulism? It is the rarest form of botulism. The illness results when C. botulinum by itself or with other microorganisms infects a wound and produces toxins, which re

Reaction specificity Some  enzymes  catalyze only one  reaction  acting  on  a specific substrate. Example: urease  and  catalase  acts  only  on  urea and  hydrogen peroxide,

Q. Define a closed circulatory system? A closed circulatory system is one in which blood circulates only inside blood vessels for this reason the blood pressure is higher in so

The dietary principles underlying the enteric diet  include: High calorie High protein High carbohydrate Moderate fat High  fluid Low fibre and soft diet


Explain the Fluoride Toxicity? Fluoride is a cumulative toxin. Ingestion of fluoride 1.0-1.5 mg/L for several years may produce dental fluorosis, i.e. browning and pitting of t