Coexistence and Competition of Mirror Biospheres Patricia Esch School of Life Sciences, Arizona...
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Transcript of Coexistence and Competition of Mirror Biospheres Patricia Esch School of Life Sciences, Arizona...
![Page 1: Coexistence and Competition of Mirror Biospheres Patricia Esch School of Life Sciences, Arizona State University, Tempe AZ USA Sara Imari Walker School.](https://reader035.fdocuments.us/reader035/viewer/2022062401/5a4d1b1b7f8b9ab0599934be/html5/thumbnails/1.jpg)
Coexistence and Competition of Mirror Biospheres
Patricia Esch School of Life Sciences, Arizona State University, Tempe AZ USA
Sara Imari Walker School of Earth and Space Exploration, Arizona State University, Tempe AZ
USA, Beyond Center for Fundamental Concepts in Science, Arizona State University Tempe, AZ USA, Blue Marble Space Institute of Science, Seattle WA
USA.
Arizona Space Grant Undergraduate SymposiumApril 18th, 2015
![Page 2: Coexistence and Competition of Mirror Biospheres Patricia Esch School of Life Sciences, Arizona State University, Tempe AZ USA Sara Imari Walker School.](https://reader035.fdocuments.us/reader035/viewer/2022062401/5a4d1b1b7f8b9ab0599934be/html5/thumbnails/2.jpg)
What is Astrobiology?
and the Origin of Life
http://origins.rpi.edu/wp-content/uploads/2012/07/homepagesplash-32.jpg
![Page 3: Coexistence and Competition of Mirror Biospheres Patricia Esch School of Life Sciences, Arizona State University, Tempe AZ USA Sara Imari Walker School.](https://reader035.fdocuments.us/reader035/viewer/2022062401/5a4d1b1b7f8b9ab0599934be/html5/thumbnails/3.jpg)
What is Astrobiology?
http://montessorimuddle.org/wp-content/uploads/2012/03/astrobiologists.jpg
![Page 4: Coexistence and Competition of Mirror Biospheres Patricia Esch School of Life Sciences, Arizona State University, Tempe AZ USA Sara Imari Walker School.](https://reader035.fdocuments.us/reader035/viewer/2022062401/5a4d1b1b7f8b9ab0599934be/html5/thumbnails/4.jpg)
What is Chirality?
http://galleryhip.com/chirality.htmlhttp://ibchemhltopicd.wikispaces.com/file/view/chirality.jpg/250978696/chirality.jpg
![Page 5: Coexistence and Competition of Mirror Biospheres Patricia Esch School of Life Sciences, Arizona State University, Tempe AZ USA Sara Imari Walker School.](https://reader035.fdocuments.us/reader035/viewer/2022062401/5a4d1b1b7f8b9ab0599934be/html5/thumbnails/5.jpg)
What is homochirality?
https://biopolyverse.files.wordpress.com/2011/04/chiralcat.png
![Page 6: Coexistence and Competition of Mirror Biospheres Patricia Esch School of Life Sciences, Arizona State University, Tempe AZ USA Sara Imari Walker School.](https://reader035.fdocuments.us/reader035/viewer/2022062401/5a4d1b1b7f8b9ab0599934be/html5/thumbnails/6.jpg)
Why is life homochiral?
http://www.forbes.com/sites/brucedorminey/2013/06/29/lifes-left-handed-amino-acids-remain-astrobiological-head-scratcher/
![Page 7: Coexistence and Competition of Mirror Biospheres Patricia Esch School of Life Sciences, Arizona State University, Tempe AZ USA Sara Imari Walker School.](https://reader035.fdocuments.us/reader035/viewer/2022062401/5a4d1b1b7f8b9ab0599934be/html5/thumbnails/7.jpg)
Our Model
• How homochirality emerged as a product of competitive selection in early life forms
• Built off recently published article: Racemization in Reverse - by Zhang and Sun– Enatiomers can be converted to opposite chirality
through racemase enzymes
![Page 8: Coexistence and Competition of Mirror Biospheres Patricia Esch School of Life Sciences, Arizona State University, Tempe AZ USA Sara Imari Walker School.](https://reader035.fdocuments.us/reader035/viewer/2022062401/5a4d1b1b7f8b9ab0599934be/html5/thumbnails/8.jpg)
Our Model
![Page 9: Coexistence and Competition of Mirror Biospheres Patricia Esch School of Life Sciences, Arizona State University, Tempe AZ USA Sara Imari Walker School.](https://reader035.fdocuments.us/reader035/viewer/2022062401/5a4d1b1b7f8b9ab0599934be/html5/thumbnails/9.jpg)
Results
![Page 10: Coexistence and Competition of Mirror Biospheres Patricia Esch School of Life Sciences, Arizona State University, Tempe AZ USA Sara Imari Walker School.](https://reader035.fdocuments.us/reader035/viewer/2022062401/5a4d1b1b7f8b9ab0599934be/html5/thumbnails/10.jpg)
Results that pose further questions…
![Page 11: Coexistence and Competition of Mirror Biospheres Patricia Esch School of Life Sciences, Arizona State University, Tempe AZ USA Sara Imari Walker School.](https://reader035.fdocuments.us/reader035/viewer/2022062401/5a4d1b1b7f8b9ab0599934be/html5/thumbnails/11.jpg)
Significance of Results
• Shed new light on processes underlying the origins of life’s homochirality
• Possibility of false negatives since two homochiral life forms may co-exist
• Better information in using homochirality as a biosignature for the search for life
![Page 12: Coexistence and Competition of Mirror Biospheres Patricia Esch School of Life Sciences, Arizona State University, Tempe AZ USA Sara Imari Walker School.](https://reader035.fdocuments.us/reader035/viewer/2022062401/5a4d1b1b7f8b9ab0599934be/html5/thumbnails/12.jpg)
THANK YOU!• ASU/NASA Space Grant
• Arizona Space Grant Consortium• BEYOND Center
• Dr. Sara Imari Walker PhD