Zobrazeno 1 - 10
of 92
pro vyhledávání: '"Per Nørnberg"'
Autor:
Ivaylo Kolchev, Ian P.G. Marshall, Eleanor Jones, Jacob C. Yde, Per Nørnberg, Alejandro Mateos-Rivera, Andy J. Hodson, Ebbe N. Bak, Kai Finster
Publikováno v:
Arctic, Antarctic, and Alpine Research, Vol 54, Iss 1, Pp 314-334 (2022)
Arctic permafrost soils store substantial reserves of organic matter (OM) from which microbial transformation contributes significantly to greenhouse gas emissions of CH4 and CO2. However, many younger sediments exposed by glacier retreat and sea lev
Externí odkaz:
https://doaj.org/article/54b88442c34a471b9a851d623a49ccc3
Autor:
Ebbe N. Bak, Michael G. Larsen, Ralf Moeller, Silas B. Nissen, Lasse R. Jensen, Per Nørnberg, Svend J. K. Jensen, Kai Finster
Publikováno v:
Frontiers in Microbiology, Vol 8 (2017)
The habitability of Mars is determined by the physical and chemical environment. The effect of low water availability, temperature, low atmospheric pressure and strong UV radiation has been extensively studied in relation to the survival of microorga
Externí odkaz:
https://doaj.org/article/e79d59c611344804bd728dafb2f68d38
Autor:
Jacob C. Yde, Andy J. Hodson, Irina Solovjanova, Jørgen P. Steffensen, Per Nørnberg, Jan Heinemeier, Jesper Olsen
Publikováno v:
Polar Research, Vol 31, Iss 0, Pp 1-15 (2012)
The chemical and stable isotope composition of a glacier-derived naled in front of the glacier Austre Grønfjordbreen, Svalbard, is examined to elucidate how secondary processes such as preferential retention and leaching affect naled chemistry. Inte
Externí odkaz:
https://doaj.org/article/f293ed174039464c98e429c330f69ec8
Autor:
Svend J. Knak Jensen, Mikkel Bregnhøj, Jan Thøgersen, Per Nørnberg, Anders Bodholt Nielsen, Jørgen Skibsted, Kai Finster
Publikováno v:
Jensen, S K, Bregnhøj, M, Thøgersen, J, Nørnberg, P, Nielsen, A B, Skibsted, J & Finster, K 2023, ' A putative mechanism for capture of carbon dioxide by quartz, mediated by triboelectric charging ', Chemical Physics Letters, vol. 816, 140395 . https://doi.org/10.1016/j.cplett.2023.140395
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::541e173314bee0782387165ad27e63aa
https://pure.au.dk/portal/da/publications/a-putative-mechanism-for-capture-of-carbon-dioxide-by-quartz-mediated-by-triboelectric-charging(33b5776b-17c9-4169-a92d-aba290b751ce).html
https://pure.au.dk/portal/da/publications/a-putative-mechanism-for-capture-of-carbon-dioxide-by-quartz-mediated-by-triboelectric-charging(33b5776b-17c9-4169-a92d-aba290b751ce).html
Publikováno v:
Bak, E N, Nornberg, P, Jensen, S J K, Thogersen, J & Finster, K 2022, ' Physical and chemical mechanisms that impact the detection, identification, and quantification of organic matter and the survival of microorganisms on the Martian surface-a review ', International Journal of Astrobiology, vol. 21, no. 5, 1473550421000392, pp. 356-379 . https://doi.org/10.1017/S1473550421000392
The iconic Viking Landers that landed on Mars in 1976 demonstrated that the Martian surface is an extreme place, dominated by high UV fluxes and regolith chemistry capable of oxidizing organic molecules. From follow-on missions, we have learned that
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::60324be4da199148980d8359cc87457e
https://pure.au.dk/portal/da/publications/physical-and-chemical-mechanisms-that-impact-the-detection-identification-and-quantification-of-organic-matter-and-the-survival-of-microorganisms-on-the-martian-surface--a-review(87dd66bb-d96b-428b-a53a-e6a6ca2b9027).html
https://pure.au.dk/portal/da/publications/physical-and-chemical-mechanisms-that-impact-the-detection-identification-and-quantification-of-organic-matter-and-the-survival-of-microorganisms-on-the-martian-surface--a-review(87dd66bb-d96b-428b-a53a-e6a6ca2b9027).html
Autor:
Ebbe Norskov Bak, Mikkel Bregnhøj, Per Nørnberg, Svend J. Knak Jensen, Jan Thøgersen, Kai Finster
Publikováno v:
Bak, E N, Bregnhøj, M, Nørnberg, P, Jensen, S K, Thøgersen, J & Finster, K 2022, ' Spore Survival During Abrasive Saltation on Mars : A Reply to the Comment by Minns et al. ', Astrobiology, vol. 22, no. 9, pp. 1032-1033 . https://doi.org/10.1089/ast.2022.0085
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ce54506ce2b57e697075825f347c895d
https://doi.org/10.1089/ast.2022.0085
https://doi.org/10.1089/ast.2022.0085
Publikováno v:
Thøgersen, J, Bak, E N, Finster, K, Nørnberg, P, Jakobsen, H J & Knak Jensen, S J 2019, ' Light on windy nights on Mars : A study of saltation-mediated ionization of argon in a Mars-like atmosphere ', Icarus, vol. 332, pp. 14-18 . https://doi.org/10.1016/j.icarus.2019.06.025
Laboratory experiments show that sand grain saltation in a Mars-like environment can result in the ionization of argon. This suggests that saltation can be a mechanism for the destruction of methane (CH4) on Mars given the ionization energy of argon
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a3c00ca95bd6e28b3372f31a21712a4d
https://doi.org/10.1016/j.icarus.2019.06.025
https://doi.org/10.1016/j.icarus.2019.06.025
Autor:
Per Nørnberg, Kai Finster, Jan Thøgersen, Thaddeus W. Golbek, Tobias Weidner, Tue Hassenkam, Walter Goetz, Mathias Oehlke, Svend J. Knak Jensen
Publikováno v:
Nornberg, P, Finster, K, Thogersen, J, Golbek, T W, Weidner, T, Hassenkam, T, Goetz, W, Oehlke, M & Jensen, S J K 2022, ' Methane as a reddish coating agent ', Icarus, vol. 382, 115023 . https://doi.org/10.1016/j.icarus.2022.115023
Nørnberg, P, Finster, K, Thøgersen, J, Golbek, T W, Weidner, T, Hassenkam, T, Goetz, W, Oehlke, M & Knak Jensen, S J 2022, ' Methane as a reddish coating agent ', Icarus, vol. 382, 115023 . https://doi.org/10.1016/j.icarus.2022.115023
Icarus
Nørnberg, P, Finster, K, Thøgersen, J, Golbek, T W, Weidner, T, Hassenkam, T, Goetz, W, Oehlke, M & Knak Jensen, S J 2022, ' Methane as a reddish coating agent ', Icarus, vol. 382, 115023 . https://doi.org/10.1016/j.icarus.2022.115023
Icarus
Experiments in quartz ampoules that simulate the saltation of quartz grains in a methane atmosphere show that the solid phase acquires a reddish color, reminiscent of the color observed on Triton, Pluto, and Charon. Reflection spectroscopy of the coa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b53e334a936b87a7acca831ba00f4203
https://doi.org/10.1016/j.icarus.2022.115023
https://doi.org/10.1016/j.icarus.2022.115023
Publikováno v:
Thøgersen, J, Nørnberg, P, Finster, K & Knak Jensen, S J 2021, ' Greenhouse gas capture by triboelectric charging ', Chemical Physics Letters, vol. 783, 139069 . https://doi.org/10.1016/j.cplett.2021.139069
A quartz ampoule with quartz grains is mechanically activated in a dry air-like atmosphere with 0.5 % of one of the major greenhouse gases CO2, CH4, and N2O. The grains rub against each other and the walls of the ampoule during activation, leading to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5a8f67aa7808324ae829fd6edbd1f6d2
https://doi.org/10.1016/j.cplett.2021.139069
https://doi.org/10.1016/j.cplett.2021.139069
Publikováno v:
Bak, E N, Larsen, M G, Jensen, S K, Nornberg, P, Moeller, R & Finster, K 2019, ' Wind-Driven Saltation : An Overlooked Challenge for Life on Mars ', Astrobiology, vol. 19, no. 4 . https://doi.org/10.1089/ast.2018.1856
Numerous studies have demonstrated that the martian surface environment is hostile to life because of its rough radiation climate and the reactive chemistry of the regolith. Physical processes such as erosion and transport of mineral particles by win
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3dcb013dcaded4d292096ecb7171cd65
https://pure.au.dk/portal/da/publications/winddriven-saltation(5b53eb02-5572-4e3b-b9bd-4843d459b88b).html
https://pure.au.dk/portal/da/publications/winddriven-saltation(5b53eb02-5572-4e3b-b9bd-4843d459b88b).html