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ItemMural on the Origins of Life (Scientist Portraits)( 2020) He, Christine ; Fialho, DavidLarge scale printable pdf files of the portraits of scientists included as detail in the Mural on the Origins of Life. Includes portraits of Rosalind Franklin, Antonio Lazcano, Stanley Miller, Alexander Oparin, Sandra Pizzarello, and Harold Urey. This mural was created and digitally painted by Christine He and David Fialho. This mural depicts some of the scientists whose contributions broadened understanding of the chemistry of life. The mural creation project came out of a partnership with the Latin American Association and Sequoyah Middle School. The original piece is currently being installed at Sequoyah Middle School in 2018. The field of prebiotic chemistry is devoted to understanding how the chemistry of life — namely, biomolecules like DNA and proteins — could have evolved from simpler compounds. One of the earliest and most important scientists in prebiotic chemistry was Alexander Oparin, who, in the 1920’s, proposed that inorganic compounds could undergo complex chemical changes, and eventually give rise to the first cells. Unfortunately, Oparin was unable to experimentally test his theories. 1952 saw the transition of prebiotic chemistry from the realm of theory to experimentation. Stanley Miller, a PhD student working under the Nobel Prize winner, Harold Urey, showed that organic compounds could be formed from sparking mixtures of simple compounds. The Miller-Urey experiment is widely considered the beginning of prebiotic chemistry as a true scientific field; Stanley Miller is referred to as the “father of prebiotic chemistry.” In the same year, 1952, a scientist named Rosalind Franklin took X-ray images of DNA that led to the discovery of DNA’s double helix structure. This momentous experiment was key to understanding the role that nucleic acids play in carrying genetic information, and sparked questions about how such an important molecule evolved and became ubiquitous in all living organisms. Many theories of the origins of life now consider RNA—the molecule shown snaking across this mural, closely related to DNA—as a central player. Since 1952, many scientists have contributed important discoveries to the field of prebiotic chemistry. Two scientists featured in this mural are Antonio Lazcano, who has shaped and lead discussion on origins of life research, and Sandra Pizzarello, who has helped us understand the role that extraterrestrial materials could have played in the evolution of biomolecules.
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ItemMural on the Origins of Life( 2018) He, Christine ; Fialho, DavidLarge scale, digital graphic files of a mural created and digitally painted by Christine He and David Fialho. Includes pdf files for printing as well as SVG and PNG files. This mural depicts some of the scientists whose contributions broadened understanding of the chemistry of life. The mural creation project came out of a partnership with the Latin American Association and Sequoyah Middle School. The original piece is currently being installed at Sequoyah Middle School in 2018. The field of prebiotic chemistry is devoted to understanding how the chemistry of life — namely, biomolecules like DNA and proteins — could have evolved from simpler compounds. One of the earliest and most important scientists in prebiotic chemistry was Alexander Oparin, who, in the 1920’s, proposed that inorganic compounds could undergo complex chemical changes, and eventually give rise to the first cells. Unfortunately, Oparin was unable to experimentally test his theories. 1952 saw the transition of prebiotic chemistry from the realm of theory to experimentation. Stanley Miller, a PhD student working under the Nobel Prize winner, Harold Urey, showed that organic compounds could be formed from sparking mixtures of simple compounds. The Miller-Urey experiment is widely considered the beginning of prebiotic chemistry as a true scientific field; Stanley Miller is referred to as the “father of prebiotic chemistry.” In the same year, 1952, a scientist named Rosalind Franklin took X-ray images of DNA that led to the discovery of DNA’s double helix structure. This momentous experiment was key to understanding the role that nucleic acids play in carrying genetic information, and sparked questions about how such an important molecule evolved and became ubiquitous in all living organisms. Many theories of the origins of life now consider RNA—the molecule shown snaking across this mural, closely related to DNA—as a central player. Since 1952, many scientists have contributed important discoveries to the field of prebiotic chemistry. Two scientists featured in this mural are Antonio Lazcano, who has shaped and lead discussion on origins of life research, and Sandra Pizzarello, who has helped us understand the role that extraterrestrial materials could have played in the evolution of biomolecules.
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ItemMainshock and early aftershock recording of the 2011/02/21 Mw6.3 earthquake in Christchurch, New Zealand(Georgia Institute of Technology, 2011) Peng, ZhigangBelow is the image and sound of the seismic recording at station HVSC (more than 1.5 g vertical acceleration) for the 2011/02/21 Mw6.3 New Zealand earthquake. This vertical seismogram is recorded by strong motion sensors only about 1 km distance from the epicenter. From the sound below, you can hear not only the mainshock like a train running towards you, but also many small pops that are early aftershocks immediately afterward. The data can be downloaded from the Center for Engineering Strong Motion Data website.
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ItemEarly aftershocks of the Mw7.9 Wenchuan earthquake in China on 2008/05/12(Georgia Institute of Technology, 2008) Peng, ZhigangOn 2008/05/12, the disastrous Mw7.9 Wenchuan earthquake ruptured ~250 km along the Longmenshan thrust belt along the Longmenshan thrust belt that bounds the Tibetan plateau and the Sichuan basin [Burchfiel et al., GSA, 2008; Xu et al., Geology, 2009]. This earthquake and its subsequent aftershocks were recorded continuously by many permanent and temporary broadband seismometers in Sichuan and elsewhere in the world. The following example is generated by the seismogram recorded at a nearby station CB.CD2. The mainshock signal is clipped, but most of the early aftershock signals are not. Many of them were not listed in the standard earthquake catalog. Author will be working with scientists at China Earthquake Administration (CEA) to detect and locate these missing early aftershocks, and use them to better understand the physics of aftershock triggering.
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ItemEarly aftershocks of the Mw6.8 Mid Niigata earthquake in Japan on 2004/10/23(Georgia Institute of Technology, 2004) Peng, ZhigangThis sound file and image was generated by the Mw6.8 Mid Niigata earthquake in Japan on 2004/10/23 . The seismogram was recorded by a nearby borehole station NGOH, which belongs to the Japanese Hi-Net , one of the best seismic network in the world. Similar to the Parkfield example, it also show many early aftershocks that were not reported in the standard earthquake catalog. Early aftershocks of this event have been studied in detail by Bogdan Enescu at NIED, Japan (Enescu et al., JGR, 2007).
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ItemEarly aftershocks of a M4.8 earthquake in Japan on 2003/11/30(Georgia Institute of Technology, 2003) Peng, ZhigangA seismogram and audio recording generated by an M4.8 earthquake in Japan on 2003/11/30. The seismogram is recorded by a nearby borehole station MYJH, which belongs to the Japanese Hi-Net , one of the best seismic network in the world. Similar to the Parkfield example, it also show many early aftershocks that were not reported in the standard earthquake catalog. Identifying those missing early aftershocks provide a new way to understand aftershock generation and the underlying physics of earthquake interaction ( Peng et al., GRL, 2006; Peng et al., JGR, 2007 ).