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Vast areas of the world¡¯s oceans are classified High Nutrient Low Chlorophyll (HNLC) regions.  Studies in the early 1990¡¯s demonstrated that iron availability limits growth of photosynthetic organisms.  Microscopic photosynthetic organisms in the ocean, like diatoms, are responsible for > 50% of global O2 production.  In addition, because diatoms have a silica shell (frustule), their death can provide a rapid and direct means for transporting CO2 from the atmosphere and upper ocean to the deep ocean.  

In the early 90's the idea of iron fertilization in the ocean as a means for restoring plankton blooms was tested by oceanographers.  Since then, several start-ups have tried to capitalize on this simplistic view for solving global warming.   The biochemistry within these microscopic organisms is far more complex than this simplistic view suggests and requires further investigation to understand the links between blooms and climate change.  

We investigated Thalassiosira pseudonana, a cosmopolitan diatom, grown under nutrient replete and iron limiting conditions to better understand how diatoms survive in iron-limited waters.  This was an exploratory project to try and decipher what metabolic strategies must be altered in order to continue photosynthesis when most of the photosynthetic complexes require iron.  Rather than focusing on single proteins or groups of proteins that are involved in on or more metabolic processes, we tried to look at whole cells metabolic transformation.

 
 


ÆäÀ̽ººÏ       ¹æ¸í·Ï      ¼öÁ¤ 2017-11-17 / µî·Ï 2017-11-17 / Á¶È¸ : 3656 (344)



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