Zobrazeno 1 - 10
of 745
pro vyhledávání: '"Ralf I. Kaiser"'
Autor:
Mason McAnally, Jana Bocková, Ashanie Herath, Andrew M. Turner, Cornelia Meinert, Ralf I. Kaiser
Publikováno v:
Nature Communications, Vol 15, Iss 1, Pp 1-11 (2024)
Abstract For the last century, the source of sulfur in Earth’s very first organisms has remained a fundamental, unsolved enigma. While sulfates and their organic derivatives with sulfur in the S(+VI) oxidation state represent core nutrients in cont
Externí odkaz:
https://doaj.org/article/cfd327ae9c3242e28e52c758ebebdcbb
Autor:
Joshua H. Marks, Jia Wang, Bing-Jian Sun, Mason McAnally, Andrew M. Turner, Agnes H.-H. Chang, Ralf I. Kaiser
Publikováno v:
ACS Central Science, Vol 9, Iss 12, Pp 2241-2250 (2023)
Externí odkaz:
https://doaj.org/article/7534350788ac419393350a56eadbee39
Autor:
Lotefa B. Tuli, Shane J. Goettl, Andrew M. Turner, A. Hasan Howlader, Patrick Hemberger, Stanislaw F. Wnuk, Tianjian Guo, Alexander M. Mebel, Ralf I. Kaiser
Publikováno v:
Nature Communications, Vol 14, Iss 1, Pp 1-12 (2023)
Nanobowls represent building blocks of fullerenes and nanotubes as detected in combustion systems and deep space, but their formation mechanisms in these environments have remained elusive. Here, the authors explore the gas-phase formation of benzoco
Externí odkaz:
https://doaj.org/article/7a9861af6f1d4937a9eb862746bbcc3c
Autor:
Jia Wang, Andrew M. Turner, Joshua H. Marks, Chaojiang Zhang, N. Fabian Kleimeier, Alexandre Bergantini, Santosh K. Singh, Ryan C. Fortenberry, Ralf I. Kaiser
Publikováno v:
The Astrophysical Journal, Vol 967, Iss 2, p 79 (2024)
Enols—tautomers of ketones or aldehydes—are considered key intermediates in the formation of prebiotic sugars and sugar acids. Although laboratory simulation experiments suggest that enols should be ubiquitous in the interstellar medium, the unde
Externí odkaz:
https://doaj.org/article/0d4171531df7448a9f20968573c5c836
Publikováno v:
Nature Communications, Vol 13, Iss 1, Pp 1-7 (2022)
The Strecker synthesis is considered a viable route to amino acids formation on the primordial Earth. Here the authors succeed in observing its elusive intermediate aminomethanol, formed by insertion of an electronically excited oxygen atom in methyl
Externí odkaz:
https://doaj.org/article/96c34f9d2eab417583304d2d48e7994f
Publikováno v:
The Astrophysical Journal Letters, Vol 945, Iss 2, p L40 (2023)
The recent astronomical detection of ethynylbutatrienylidene (HCCCHCCC)—a high-energy isomer of triacetylene (HCCCCCCH) and hexapentaenylidene (H _2 CCCCCC)—in TMC-1 puzzled the laboratory astrophysics community since proposed reaction pathways c
Externí odkaz:
https://doaj.org/article/df1943f0cf6a46cab8e1f09f1c87ab60
Autor:
Cheng Zhu, André K. Eckhardt, Sankhabrata Chandra, Andrew M. Turner, Peter R. Schreiner, Ralf I. Kaiser
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-7 (2021)
High-nitrogen content polyhedral molecules are of fundamental interest for theory and for synthesis applications. The authors, using isomer selective, tunable soft photoionization reflectron time-of-flight mass spectrometry, identify the formation of
Externí odkaz:
https://doaj.org/article/a5e7465c29c14f928b298e9573656eb7
Autor:
Santosh K. Singh, Alexandre Bergantini, Cheng Zhu, Marco Ferrari, Maria Cristina De Sanctis, Simone De Angelis, Ralf I. Kaiser
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-8 (2021)
The authors here propose a chemical reaction that forms ammoniated phyllosilicates on Ceres. This process could trigger at a very low temperature, suggesting Ceres evolution in a region different from its current location.
Externí odkaz:
https://doaj.org/article/c51b2eb1a3d246a98bd51007b981c0e1
Autor:
Chaojiang Zhang, Jia Wang, Andrew M. Turner, Joshua H. Marks, Sankhabrata Chandra, Ryan C. Fortenberry, Ralf I. Kaiser
Publikováno v:
The Astrophysical Journal, Vol 952, Iss 2, p 132 (2023)
Amines—organic molecules carrying the –NH _2 moiety—have been recognized as a vital intermediate in the formation of prebiotic molecules such as amino acids and nucleobases. Here we report the formation of vinylamine (C _2 H _3 NH _2 ), which w
Externí odkaz:
https://doaj.org/article/c926880d7843473ba6881a6c9c0e57d4
Autor:
Joshua H. Marks, Jia Wang, Mikhail M. Evseev, Oleg V. Kuznetsov, Ivan O. Antonov, Ralf I. Kaiser
Publikováno v:
The Astrophysical Journal, Vol 942, Iss 1, p 43 (2023)
The formation of complex organic molecules by simulated secondary electrons generated in the track of galactic cosmic rays was investigated in interstellar ice analogs composed of methanol and carbon dioxide. The processed ices were subjected to temp
Externí odkaz:
https://doaj.org/article/f58a6307df104fb79e8bea574b968fc9