Zobrazeno 1 - 10
of 66
pro vyhledávání: '"Janusz J Petkowski"'
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-14 (2024)
Abstract Recent renewed interest in the possibility of life in the acidic clouds of Venus has led to new studies on organic chemistry in concentrated sulfuric acid. We have previously found that the majority of amino acids are stable in the range of
Externí odkaz:
https://doaj.org/article/a2d1849dab414f58a23461d99720318d
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-14 (2024)
Abstract Life on Earth is known to rarely make fluorinated carbon compounds, as compared to other halocarbons. We quantify this rarity, based on our exhaustive natural products database curated from available literature. We build on explanations for
Externí odkaz:
https://doaj.org/article/cbbdae955d5c442d938c1b9b4243e9e1
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-11 (2024)
Abstract Exoplanet atmospheres are expected to vary significantly in thickness and chemical composition, leading to a continuum of differences in surface pressure and atmospheric density. This variability is exemplified within our Solar System, where
Externí odkaz:
https://doaj.org/article/bf875cf0ef124f70a207cf49cf9a4b9e
Autor:
William Bains, Sara Seager, David L. Clements, Jane S. Greaves, Paul B. Rimmer, Janusz J. Petkowski
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 11 (2024)
The tentative detection of ppb levels of phosphine (PH3) in the clouds of Venus was extremely surprising, as this reduced gas was not expected to be a component of Venus’ oxidized atmosphere. Despite potential confirmation in legacy Pioneer Venus m
Externí odkaz:
https://doaj.org/article/6202df4d155f4248b9ce5c5193b0c215
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-13 (2023)
Abstract Waste gas products from technological civilizations may accumulate in an exoplanet atmosphere to detectable levels. We propose nitrogen trifluoride (NF3) and sulfur hexafluoride (SF6) as ideal technosignature gases. Earth life avoids produci
Externí odkaz:
https://doaj.org/article/071a5e628a8e4ba7b06c5fc855e986b2
Autor:
Jane S. Greaves, Janusz J. Petkowski, Anita M. S. Richards, Clara Sousa‐Silva, Sara Seager, David L. Clements
Publikováno v:
Geophysical Research Letters, Vol 50, Iss 23, Pp n/a-n/a (2023)
Abstract Searches for phosphine in Venus' atmosphere have sparked a debate. Cordiner et al. (2022, https://doi.org/10.1029/2022gl101055) analyze spectra from the Stratospheric Observatory For Infrared Astronomy (SOFIA) and infer
Externí odkaz:
https://doaj.org/article/32f9fe41292347f0bd96e432667bfa84
Autor:
Sara Seager, Janusz J. Petkowski, Maxwell D. Seager, John H. Grimes, Zachary Zinsli, Heidi R. Vollmer-Snarr, Mohamed K. Abd El-Rahman, David S. Wishart, Brian L. Lee, Vasuk Gautam, Lauren Herrington, William Bains, Charles Darrow
Publikováno v:
Life, Vol 14, Iss 5, p 538 (2024)
We show that the nucleic acid bases adenine, cytosine, guanine, thymine, and uracil, as well as 2,6-diaminopurine, and the “core” nucleic acid bases purine and pyrimidine, are stable for more than one year in concentrated sulfuric acid at room te
Externí odkaz:
https://doaj.org/article/a3260439f65f43399e9421d460304ffa
Publikováno v:
Life, Vol 13, Iss 12, p 2325 (2023)
Isotopologue ratios are anticipated to be one of the most promising signs of life that can be observed remotely. On Earth, carbon isotopes have been used for decades as evidence of modern and early metabolic processes. In fact, carbon isotopes may be
Externí odkaz:
https://doaj.org/article/33f34f7da54842cf96ec042527a585a3
Autor:
Stefan Gerhardy, Michaela Oborská-Oplová, Ludovic Gillet, Richard Börner, Rob van Nues, Alexander Leitner, Erich Michel, Janusz J. Petkowski, Sander Granneman, Roland K. O. Sigel, Ruedi Aebersold, Vikram Govind Panse
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-16 (2021)
Ribosome biogenesis is crucially dependent on proper rRNA folding, a process assisted by chaperones. Here the authors reveal how Puf6 promotes correct rRNA folding at low temperature, a condition where mis-paired RNA folding intermediates frequently
Externí odkaz:
https://doaj.org/article/0bae3de09764483c9083cf74b1da5f94
Autor:
Sara Seager, Janusz J. Petkowski, Christopher E. Carr, Sarag J. Saikia, Rachana Agrawal, Weston P. Buchanan, David H. Grinspoon, Monika U. Weber, Pete Klupar, Simon P. Worden, Iaroslav Iakubivskyi, Mihkel Pajusalu, Laila Kaasik, on behalf of the Venus Life Finder Mission Team
Publikováno v:
Aerospace, Vol 9, Iss 11, p 733 (2022)
For over half a century, scientists have contemplated the potential existence of life within the clouds of Venus. Unknown chemistry leaves open the possibility that certain regions of the Venusian atmosphere are habitable. In situ atmospheric measure
Externí odkaz:
https://doaj.org/article/3db32072f2494446923cbaecfa156a29