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In the vast ocean where an essential nutrient-iron-is scarce, a marine bacterium that launches the ocean food web survives by using a remarkable biochemical trick: It recycles iron. By day, it uses iron in enzymes for photosynthesis to make carbohydrates; then by night, it appears to reuse the same iron in different enzymes to produce organic nitrogen for proteins.[Source: Oceanus - Woods Hole Oceanographic Institute]
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