Figure 4.4

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Figure 4.4 The Nitrogen Cycle

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The Nitrogen Cycle. Figure 4.4. While N 2 is the ultimate source and sink of biospheric nitrogen, several oxidized and reduced forms occur in the environment. . Nitrogen Fixation. Figure 15.17. - PowerPoint PPT Presentation

Transcript of Figure 4.4

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Figure 4.4

The Nitrogen Cycle

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• While N2 is the ultimate source and sink of biospheric nitrogen, several oxidized and reduced forms occur in the environment.

Nitrogen Fixation

Figure 15.17

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• Nitrogen-fixing bacteria may be free-living in soil or water, or they may form symbiotic associations with plants.

• - Rhizobium and legumes

The Nitrogen Cycle

Figure 4.5

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FeMoCo

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• The nitrogenase complex includes two kinds of subunits:

The Mechanism of Nitrogen Fixation

- A protein with an iron-sulfur core (Fe protein) - A protein containing a complex of molybdenum, iron, and sulfur protein (FeMo protein)

Electrons acquired by Fe protein (with energy from ATP) are transferred to FeMo protein to reduce nitrogen. Figure 15.19A

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Figure 15.20

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Figure 15.21B

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• Nitrogen gas (N2) is fixed into ammonium ion (NH4

+) only by some species of bacteria and archaea.

• Aquatic cyanobacteria develop special cells called heterocysts to fix N2.

• - Photosynthesis is turned off to maintain anaerobic conditions.

Nitrogen Fixation

Figure 15.18

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Figure 21.33

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