Podcasts · Scientificast, la scienza come non l'hai mai sentita
Batteri stratosferici e piccioni magnetici
· 51 min
Episode Batteri stratosferici e piccioni magnetici
Nella puntata 619, Francesca e Luca ci conducono in volo alla scoperta dei batteri che popolano la stratosfera e i piccioni che volano alle nostre altitudini. Francesca ci spiega che, per orientarsi, i piccioni utilizzerebbero diversi meccanismi, tutti indipendenti fra loro. In condizioni meteorologico favorevoli, essi utilizzano principalmente la vista. Quando non è possibile sfruttare gli occhi, i piccioni avrebbero una bussola speciale, contenuta nei loro macrofagi con speciali proprietà superparamagnetiche. In esterna, Andrea e Giorgio tornano con i loro consigli di lettura, perfetti da leggere a casa oppure in vacanza sotto l'ombrellone e in montagna. Tornati in redazione, Luca ci delizia con la consueta barza brutta, per poi raccontarci di speciali batteri presenti nella stratosfera, in grado di resistere a rigidissime condizioni di pressione, temperatura ma anche all'esposizione ai raggi UVC. Fonti:C. Lisowski et al. Homing pigeon navigation relies on superparamagnetic macrophages under overcast conditions. Science. Vol. 392, pp. 985-991. doi: 10.1126/science.ady2486. https://www.sciencenews.org/article/earth-stratosphere-life-microbes J.M. Scouten et al. Curtobacterium aetherium sp. nov., a polyextremophilic plant pathogen isolated from the stratosphere. Microbiology Spectrum. Vol. 13, April 2, 2025. doi: 10.1128/spectrum.01774-24. A.J. Ellington et al. The genetic determinants of extreme UV radiation and desiccation tolerance in a bacterium recovered from the stratosphere. Microorganisms. Vol. 13, March 27, 2025. doi: 10.3390/microorganisms13040756.N.C. Bryan et al. Abundance and survival of microbial aerosols in the troposphere and stratosphere. The ISME Journal. Vol. 13, July 17, 2019, p. 2789. doi: 10.1038/s41396-019-0474-0.R.L. Harris and A.C. Schuerger. Hydrogenotrophic methanogenesis at 7-12 mbar by Methanosarcina barkeri under simulated martian atmospheric conditions. Scientific Reports. Vol. 15, January 22, 2025, p. 2880. doi: 10.1038/s41598-025-86145-1.S. Seager et al. The Venusian lower atmosphere haze as a depot for desiccated microbial life: A proposed life cycle for persistence of the Venusian aerial biosphere. Astrobiology. Vol. 21, October 2021, p. 1206. doi: 10.1089/ast.2020.2244. Diventa un supporter di questo podcast: https://www.spreaker.com/podcast/scientificast-la-scienza-come-non-l-hai-mai-sentita--1762253/support.
Links in the notes 7
- https://doi.org/10.1126/science.ady2486
- https://journals.asm.org/doi/10.1128/spectrum.01774-24
- https://www.mdpi.com/2076-2607/13/4/756
- https://academic.oup.com/ismej/article/13/11/2789/7475148
- https://www.nature.com/articles/s41598-025-86145-1
- https://pubmed.ncbi.nlm.nih.gov/32787733/
- https://www.spreaker.com/podcast/scientificast-la-scienza-come-non-l-hai-mai-sentita--1762253/support?utm_source=rss&utm_medium=rss&utm_campaign=rss
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