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{"fact":"Cats' hearing stops at 65 khz (kilohertz); humans' hearing stops at 20 khz.","length":75}
{"type":"standard","title":"Castle of Portalegre","displaytitle":"Castle of Portalegre","namespace":{"id":0,"text":""},"wikibase_item":"Q7231504","titles":{"canonical":"Castle_of_Portalegre","normalized":"Castle of Portalegre","display":"Castle of Portalegre"},"pageid":19731534,"thumbnail":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/b/b4/Muralha_e_Museu_do_Castelo_de_Portalegre_%28pormenor%29.jpg/320px-Muralha_e_Museu_do_Castelo_de_Portalegre_%28pormenor%29.jpg","width":320,"height":240},"originalimage":{"source":"https://upload.wikimedia.org/wikipedia/commons/b/b4/Muralha_e_Museu_do_Castelo_de_Portalegre_%28pormenor%29.jpg","width":2816,"height":2112},"lang":"en","dir":"ltr","revision":"1254939034","tid":"a56213ec-990f-11ef-b6bd-096356dfcc55","timestamp":"2024-11-02T11:43:15Z","description":"Portuguese medieval castle","description_source":"local","coordinates":{"lat":39.2912,"lon":-7.4308},"content_urls":{"desktop":{"page":"https://en.wikipedia.org/wiki/Castle_of_Portalegre","revisions":"https://en.wikipedia.org/wiki/Castle_of_Portalegre?action=history","edit":"https://en.wikipedia.org/wiki/Castle_of_Portalegre?action=edit","talk":"https://en.wikipedia.org/wiki/Talk:Castle_of_Portalegre"},"mobile":{"page":"https://en.m.wikipedia.org/wiki/Castle_of_Portalegre","revisions":"https://en.m.wikipedia.org/wiki/Special:History/Castle_of_Portalegre","edit":"https://en.m.wikipedia.org/wiki/Castle_of_Portalegre?action=edit","talk":"https://en.m.wikipedia.org/wiki/Talk:Castle_of_Portalegre"}},"extract":"The Castle of Portalegre is a Portuguese medieval castle in the civil parish of Sé e São Lourenço, municipality of Portalegre, district of Portalegre.","extract_html":"
The Castle of Portalegre is a Portuguese medieval castle in the civil parish of Sé e São Lourenço, municipality of Portalegre, district of Portalegre.
"}{"type":"standard","title":"Dynamic nuclear polarization","displaytitle":"Dynamic nuclear polarization","namespace":{"id":0,"text":""},"wikibase_item":"Q976837","titles":{"canonical":"Dynamic_nuclear_polarization","normalized":"Dynamic nuclear polarization","display":"Dynamic nuclear polarization"},"pageid":1119342,"thumbnail":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/e/e7/DNP_Polarizing_Agents.png/330px-DNP_Polarizing_Agents.png","width":320,"height":235},"originalimage":{"source":"https://upload.wikimedia.org/wikipedia/commons/e/e7/DNP_Polarizing_Agents.png","width":1048,"height":768},"lang":"en","dir":"ltr","revision":"1270769916","tid":"0468630e-d7ae-11ef-b083-83334730730b","timestamp":"2025-01-21T04:13:07Z","description":"Spin polarization of atomic nuclei in response to electron spin realignment in a magnetic field","description_source":"local","content_urls":{"desktop":{"page":"https://en.wikipedia.org/wiki/Dynamic_nuclear_polarization","revisions":"https://en.wikipedia.org/wiki/Dynamic_nuclear_polarization?action=history","edit":"https://en.wikipedia.org/wiki/Dynamic_nuclear_polarization?action=edit","talk":"https://en.wikipedia.org/wiki/Talk:Dynamic_nuclear_polarization"},"mobile":{"page":"https://en.m.wikipedia.org/wiki/Dynamic_nuclear_polarization","revisions":"https://en.m.wikipedia.org/wiki/Special:History/Dynamic_nuclear_polarization","edit":"https://en.m.wikipedia.org/wiki/Dynamic_nuclear_polarization?action=edit","talk":"https://en.m.wikipedia.org/wiki/Talk:Dynamic_nuclear_polarization"}},"extract":"Dynamic nuclear polarization (DNP) is one of several hyperpolarization methods developed to enhance the sensitivity of nuclear magnetic resonance (NMR) spectroscopy. While an essential analytical tool with applications in several fields, NMR’s low sensitivity poses major limitations to analyzing samples with low concentrations and limited masses and volumes. This low sensitivity is due to the relatively low nuclear gyromagnetic ratios (γn) of NMR active nuclei (1H, 13C, 15N, etc.) as well as the low natural abundance of certain nuclei. Several techniques have been developed to address this limitation, including hardware adjustments to NMR instruments and equipment (e.g., NMR tubes), improvements to data processing methods, and polarization transfer methods to NMR active nuclei in a sample—under which DNP falls.","extract_html":"
Dyn