{"id":80870,"date":"2026-01-08T14:20:53","date_gmt":"2026-01-08T14:20:53","guid":{"rendered":"https:\/\/www.europesays.com\/ee\/80870\/"},"modified":"2026-01-08T14:20:53","modified_gmt":"2026-01-08T14:20:53","slug":"merihundi-tugevad-hambad-tombuvad-pikisuunalise-surve-peale-ka-laiuti-kokku-loodus","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/ee\/80870\/","title":{"rendered":"Merihundi tugevad hambad t\u00f5mbuvad pikisuunalise surve peale ka laiuti kokku | Loodus"},"content":{"rendered":"

Merihunt ehk kasskala on Atlandi ookeani p\u00f5hjaosa elanik, kellel on ees t\u00f6mp n\u00e4gu ja seljal pikk uim ja keda inimesed nii suure hoolega p\u00fc\u00fcavad ja s\u00f6\u00f6vad, et tema arvukuse langus teeb hoolijatele juba muret.<\/p>\n

Nime on ta saanud oma pikkade kihvalaadsete esihammaste p\u00e4rast, millega ta suudab v\u00e4ga k\u00f5vasti hammustada, kui ise kedagi s\u00fc\u00fca tahab. Saakloomade k\u00f5vade kodade purustamine on selliste hammastega k\u00e4kitegu.<\/p>\n

N\u00fc\u00fcd on teadlased selgemini taibanud, kuidas merihundi hambad sellisele tugevale survele ise vastu peavad. Selgub, et neil hammastel on eriline f\u00fc\u00fcsikaline omadus, mida elusolendite k\u00f5vades kudedes kohtab \u00fcliharva.<\/p>\n

<\/p>\n

Iisraeli, Saksa ja Prantsuse teadlased on avastanud, et merihundi hammastes sisalduv materjal osteodentiin on aukseetiline.<\/p>\n

See t\u00e4hendab, et kui seda materjali pikkupidi kokku suruda, siis ei l\u00e4he ta laiupidi laiemaks nagu k\u00f5ik tavalised materjalid, vaid t\u00f5mbub ka laiupidisuunas kokku. Selline omadus hoiab h\u00e4sti \u00e4ra pragude tekke suuremagi surve peale.<\/p>\n

Ron Shahar Jeruusalemma Heebrea \u00dclikoolist ja ta kolleegid uurisid mehaanikakatseis kaheksat merihundi hammast, milles k\u00f5igis tuvastasid nii k\u00f5rge aukseetilisuse, mida kohtab harva isegi tehismaterjales.<\/p>\n

R\u00f6ntgentomograafia ja digit\u00f6\u00f6tluse toel koostasid nad hammaste igasuunalistest kokkut\u00f5mbumistest \u00fchesuunalise surve peale t\u00e4psed kolmem\u00f5\u00f5tmelised pildid. Neilt paistis, et merihundi hambad t\u00f5mbuvad k\u00f5igi kolme ruumitelje suunas kokku \u00fcllatavalt \u00fchtlast viisi.<\/p>\n

Saladus paistab peituvat merihundi ostodentiini mikroskoopilises struktuuris \u2014 \u00fclitihedas \u00fclipeente kanalite v\u00f5rgustikus.<\/p>\n

Teadlased kirjutavad ajakirjas Acta Biomaterialia<\/a>, et aukseetilisust tasuks n\u00fc\u00fcd otsida ka muude kalade hammastest. Varem ei ole aukseetiat selgroogsete loomade mineaalistunud kudedes mitte kunagi t\u00e4heldatudki.<\/p>\n

Materjaliteadlased uurivad t\u00e4nap\u00e4eval hoolega tehislikke, niinimetatud metamaterjale, millel selline omadus on. Neid materjale saab kasutada h\u00e4sti n\u00e4iteks l\u00f6\u00f6kide v\u00f5i helide summutamiseks.<\/p>\n

Teadusuudised on Vikerraadios eetris esmasp\u00e4evast reedeni ca kell 8.35 ja laup\u00e4eval ca kell 8.25.<\/p>\n","protected":false},"excerpt":{"rendered":"Merihunt ehk kasskala on Atlandi ookeani p\u00f5hjaosa elanik, kellel on ees t\u00f6mp n\u00e4gu ja seljal pikk uim ja…\n","protected":false},"author":2,"featured_media":80871,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_share_on_mastodon":"0"},"categories":[80],"tags":[40349,26,27,37,33,35,34,36,31,32,3928,21,1688,28,29,95,38569,40347,19,40348,25,23,24,22,20,30,92,93,94],"class_list":["post-80870","post","type-post","status-publish","format-standard","has-post-thumbnail","category-maailm","tag-aukseetilisus","tag-breaking-news","tag-breakingnews","tag-ee","tag-eesti","tag-eesti-keel","tag-estonia","tag-estonian","tag-featured-news","tag-featurednews","tag-hambad","tag-headlines","tag-kala","tag-latest-news","tag-latestnews","tag-maailm","tag-materjal","tag-merihunt","tag-news","tag-osteodentiin","tag-populaarseimad-lood","tag-top-stories","tag-topstories","tag-uldised-uudised","tag-uudised","tag-viimased-uudised","tag-world","tag-world-news","tag-worldnews"],"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@ee\/115859926778176427","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/posts\/80870","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/comments?post=80870"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/posts\/80870\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/media\/80871"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/media?parent=80870"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/categories?post=80870"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/tags?post=80870"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}