{"id":428917,"date":"2020-07-30T08:01:27","date_gmt":"2020-07-30T06:01:27","guid":{"rendered":"https:\/\/hudo.com\/si\/2020\/07\/30\/znanstveniki-so-dolgo-mislili-da-v-morski-puscavi-ni-zivljenja-motili-so-se\/"},"modified":"2020-07-30T08:01:27","modified_gmt":"2020-07-30T06:01:27","slug":"znanstveniki-so-dolgo-mislili-da-v-morski-puscavi-ni-zivljenja-motili-so-se","status":"publish","type":"post","link":"https:\/\/hudo.com\/si\/lifestyle\/znanstveniki-so-dolgo-mislili-da-v-morski-puscavi-ni-zivljenja-motili-so-se\/","title":{"rendered":"Znanstveniki so dolgo mislili, da v &#8216;morski pu\u0161\u010davi&#8217; ni \u017eivljenja &#8211; motili so se!"},"content":{"rendered":"<figure>\n\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"660\" height=\"320\" src=\"image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" class=\"lazyload\" \/><figcaption>foto:Profimedia<\/figcaption><\/figure>\n<p>Ekipa z raziskovalne ladje Joides Resolution je v dno oceana naredila vrtine in vzela ve\u010d vzorcev za analizo. Vrtine v usedlino na dnu so bile globoke tudi ve\u010d kot 74 metrov, njihova starost pa je ocenjena od 13 pa do ve\u010d kot 100 milijonov let.<\/p>\n<h2>Morska pu\u0161\u010dava<\/h2>\n<p>Znanstveniki \u017ee ve\u010d desetletij zbirajo vzorce usedlin v oceanih, da bi preu\u010dili klimatske pogoje v zgodovini, sestavo tal ter globokomorski ekosistem. V ju\u017enem Pacifiku je skupina znanstvenikov na \u010delu z japonskim mikrobiologom Yukijem Moronom preu\u010devala Ju\u017eni pacifi\u0161ki tok, ki povezuje Ju\u017eno Ameriko in Avstralijo.<\/p>\n<p>Na podlagi specifi\u010dnih okoljskih pogojev so to obmo\u010dje znanstveniki doslej pogosto ozna\u010dili kot morsko pu\u0161\u010davo. Mo\u010dno je sevanje sonca, UV-indeks je zelo visok, zaradi morskega toka pa v to obmo\u010dje ne pridejo niti pra\u0161ni delci. Voda zaradi vsega tega v tem delu oceana ni le zelo \u010dista, ampak morskim \u017eivalim ponuja tudi zelo skope zaloge hrane.<\/p>\n<p>&#8220;Glavno vpra\u0161anje je bilo, ali lahko na obmo\u010dju s tako majhno zalogo hrane obstaja \u017eivljenje ali pa gre za obmo\u010dje brez,&#8221; je pojasnil Morono in dodal: &#8220;Zanimalo nas je tudi, kako dolgo se mikrobi lahko obdr\u017eijo brez hrane.&#8221;<\/p>\n<p>V morskem dnu je \u017eivljenje mo\u017eno, ka\u017ee analiza vzorcev. Tam nastajajo usedline iz organskih odpadkov, ki jih na vodno gladino prina\u0161a veter in del, ki pripotuje s tokom. Usedlina nato prekrije mikroorganizme, ki lahko pre\u017eivijo tudi v teh razmerah. Gre npr. za bakterije in mikroalge, ki se prilagodijo skromnim razmeram, mednje sodijo predvsem enoceli\u010dna bitja, pa tudi nekatere vrste alg in plesni, manj\u0161e od 0,03 milimetra.<\/p>\n<p>Najdene organizme so znanstveniki v laboratorijih sku\u0161ali vzpodbuditi k rasti. In poskusi so pokazali, da v milijone let starih usedlinah niso ostali fosili, ampak po ve\u010dini bakterije, ki so \u0161e kako \u017eive in so se v specifi\u010dnih pogojih sposobne razmno\u017eevati. &#8220;Bil sem zelo skepti\u010den, a nam je uspelo dokazati, da je bilo ve\u010d kot 99 odstotkov mikrobov, ki so stari \u017ee ve\u010d kot 100 milijonov let, pripravljenih sprejeti prehranske snovi in se razvijati,&#8221; je \u0161e dejal japonski mikrobiolog.<\/p>\n<p>&#8220;Videli smo, da je \u017eivljenje v starih usedlinah svetovnih morij neomejeno in da tam obstajajo organizmi, ki pre\u017eivijo z najmanj\u0161imi mo\u017enimi zalogami hrane ter da se ob spremembi pogojev lahko vrnejo v naravo, rastejo in se razmno\u017eujejo,&#8221; pa je o odkritjih zapisal soavtor \u0161tudije Steven D&#8217;Hondt.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Skoraj 100 metrov pod morskim dnom Tihega oceana \u017ee 100 milijonov let \u017eivijo mikroorganizmi, v reviji Nature Communications pi\u0161ejo japonski in ameri\u0161ki znanstveniki. V laboratorijskih pogojih jim je organizme uspelo celo razmno\u017eevati, zapis povzema nem\u0161ka tiskovna agencija dpa.<\/p>\n","protected":false},"author":1,"featured_media":428918,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1091],"tags":[2171,11302,1645],"source":[1522,1518,1552],"supertag":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Znanstveniki so dolgo mislili, da v &#8216;morski pu\u0161\u010davi&#8217; ni \u017eivljenja &#8211; motili so se! - Hudo Slovenija<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/hudo.com\/si\/lifestyle\/znanstveniki-so-dolgo-mislili-da-v-morski-puscavi-ni-zivljenja-motili-so-se\/\" \/>\n<meta property=\"og:locale\" content=\"sl_SI\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Znanstveniki so dolgo mislili, da v &#8216;morski pu\u0161\u010davi&#8217; ni \u017eivljenja &#8211; motili so se! - Hudo Slovenija\" \/>\n<meta property=\"og:description\" content=\"Skoraj 100 metrov pod morskim dnom Tihega oceana \u017ee 100 milijonov let \u017eivijo mikroorganizmi, v reviji Nature Communications pi\u0161ejo japonski in ameri\u0161ki znanstveniki. 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