PPT On NITROGEN FIXATION

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NITROGEN FIXATION Presentation Transcript:
1.NITROGEN FIXATION

2.Introduction
Most Abundant
Essential Organic Component
Primary Nutrient             Green Plants
Fixed Nitrogen ??
Nitrogen Fixing organisms          Diazatrophs

3.Nitrogen Cycle :
Relationship b/w Organic & Inorganic N2 Metabolism.

4.Abiotic Fixation
Result : Nitrates
Source: Lightening & Cosmic Radiations

 Nitrogen+ Oxygen                Nitrogen Oxides
                                            (NO , NO2)
 Nitrogen Oxides + Water              Nitric Acid

5.Cyanobacteria:
Imp. In Carbon and Nitrogen Cycle
Utilize variety of inorganic and organic sources of combined nitrogen such as nitrate, nitrite, ammonium

6.Rhizobia & Flankia

7.Nitrogen cycle
Series of natural processes by which nitrogen passes through successive stations in air, soil, and organisms.
The atmospheric nitrogen occur in an inert form (N2)/can’t be used by most of the orangnims.
Atmospheric nitrogen is fixed by nitrogen cycle.
Which principally invovles:-
Nitrogen fixation.
Nitrification.
Assimilation.
Ammonification.
Dentrification.

8.Deposits into soil & surface water precipitation.
Once settled; undergo changes
Conversion via Microorganisms:
Bacteria in symbiotic relation with plants.
Free aerobic bacteria/alga.
Cyanobactetria

9.Two step process; converts NH3/NH4+ to NO3.
In first step:-
    Nitrosomanas/nitrococcus (soil bacteria) convert NH3 to NO2-.

10.In second step:-
 Nitrobacter converts NO2- to NO3-.
Bacteria  gain energy known as ( nitrifying bacteria).

11.Assimilation:-
Process by which plants/animals take up nitrates and ammonia.
Plants take up NO3- and NH4+ through their roots and integrate them into various plant proteins /nucleic acids.
Animals take up this nitrogen by consuming plant tissues.

12.Ammonification:-
Many bacteria and fungi convert nitrogen into ammoniumNH4+ known as ammonification.
Converted ammmonia become available to take part in other biological processes.

13.Denitrification:-

14.Ecological Implications of Human Alterrations to Nitrogen Cycle:-
Burning fossils fuels.
Primary productivity of many ecosystems.
Alterations in both aquatic/terrestrial ecosystems.
Argicultural systems (leach out of soil)
Haber-bosch process.
Anoxio/hypoxia.
Harmful algal blooms.
Change in boidiversty/overall ecosystem function.
Parasitic/infectious diseases (humans/wildlife).
Increased acidification in freshwater ecosystems.