{"id":92092,"date":"2024-07-24T10:49:11","date_gmt":"2024-07-24T07:49:11","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=92092"},"modified":"2024-07-24T10:49:11","modified_gmt":"2024-07-24T07:49:11","slug":"descoperire-captivanta-a-oamenilor-de-stiinta-s-a-gasit-oxigen-intunecat-pe-fundul-oceanelor-se-schimba-teoria-privind-aparitia-vietii","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/descoperire-captivanta-a-oamenilor-de-stiinta-s-a-gasit-oxigen-intunecat-pe-fundul-oceanelor-se-schimba-teoria-privind-aparitia-vietii\/","title":{"rendered":"Descoperire captivant\u0103 a oamenilor de \u015ftiin\u0163\u0103: s-a g\u0103sit &#8222;oxigen \u00eentunecat&#8221; pe fundul oceanelor! Se schimb\u0103 teoria privind apari\u0163ia vie\u0163ii&#8230;"},"content":{"rendered":"<figure id=\"attachment_92094\" aria-describedby=\"caption-attachment-92094\" style=\"width: 348px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/07\/oxigen-intunecat-pe-fundul-oceanului.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-92094\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/07\/oxigen-intunecat-pe-fundul-oceanului.jpg\" alt=\"\" width=\"358\" height=\"316\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/07\/oxigen-intunecat-pe-fundul-oceanului.jpg 358w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/07\/oxigen-intunecat-pe-fundul-oceanului-300x265.jpg 300w\" sizes=\"auto, (max-width: 358px) 100vw, 358px\" \/><\/a><figcaption id=\"caption-attachment-92094\" class=\"wp-caption-text\"><strong>Imagine:<\/strong> generata de <strong>Microsoft Designer<\/strong><\/figcaption><\/figure>\n<p>Oamenii de \u0219tiin\u021b\u0103 au descoperit minerale metalice pe fundul oceanului, minerale care produc <em>&#8222;oxigen \u00eentunecat&#8221;<\/em>, conform descoperirilor prezentate \u00eentr-un nou studiu care ar putea r\u0103sturna presupunerile din trecut c\u0103 oxigenul planetei noastre este produs exclusiv de organisme fotosintetice.<\/p>\n<p>Descoperirea, f\u0103cut\u0103 la o ad\u00e2ncime de peste 4.000 de metri sub suprafa\u021ba oceanului, arat\u0103 c\u0103 oxigenul poate fi produs chiar \u0219i \u00een \u00eentunericul complet al fundului unei m\u0103ri sau ocean. Noile descoperiri ar putea s\u0103 provoace \u00een\u021belegerea noastr\u0103 actual\u0103 a originilor vie\u021bii aerobe pe P\u0103m\u00e2nt.<\/p>\n<p><em>&#8222;Pentru ca via\u021ba aerob\u0103 s\u0103 \u00eenceap\u0103 pe planet\u0103, trebuia s\u0103 existe oxigen \u0219i \u00een\u021belegeam c\u0103 aprovizionarea cu oxigen a P\u0103m\u00e2ntului a \u00eenceput cu organisme fotosintetice&#8221;<\/em>, a spus Andrew Sweetman de la Asocia\u021bia Sco\u021bian\u0103 pentru \u0218tiin\u021be Marine (SAMS), care a f\u0103cut descoperirea revolu\u021bionar\u0103. El \u015fi echipa sa au luat probe dintr-o creast\u0103 submarin\u0103 muntoas\u0103 din Oceanul Pacific, cunoscut\u0103 sub numele de Zona Clarion-Clipperton. <em>&#8222;Dar acum \u0219tim c\u0103 exist\u0103 oxigen produs \u00een ad\u00e2ncimea oceanului, unde nu exist\u0103 lumin\u0103&#8221;<\/em>, a ad\u0103ugat Sweetman.<\/p>\n<p>Potrivit lui Sweetman \u0219i colegii s\u0103i, cheia descoperirii const\u0103 \u00een nodulii polimetalici, z\u0103c\u0103minte minerale naturale de pe fundul oceanului. Ace\u0219ti noduli, dintre care unii pot fi la fel de mici ca granulele de nisip \u0219i al\u021bii la fel de mari ca o minge de baseball, sunt alc\u0103tui\u021bi din metale precum cobalt, cupru, litiu, mangan \u0219i nichel. Noul studiu a fost\u00a0 publicat \u00een revista <strong><em>&#8222;Nature Geoscience&#8221;<\/em><\/strong>.<\/p>\n<p>Ini\u021bial, Sweetman a crezut c\u0103 detectarea oxigenului pe fundul oceanului ar fi putut fi rezultatul unor erori ale senzorului. Dar, dup\u0103 recalibrarea senzorilor pe parcursul a 10 ani, aceste citiri ciudate de oxigen au continuat s\u0103 apar\u0103. Verific\u0103ri suplimentare prin alte mijloace au ajutat \u00een cele din urm\u0103 la confirmarea descoperirii surprinz\u0103toare, determin\u00e2ndu-l pe Sweetman s\u0103-l contacteze pe Geiger (cercet\u0103tor la Universitatea de Nordvest) \u00een vara anului 2023, pentru a explora modalit\u0103\u021bile poten\u021biale \u00een care ar putea fi produs oxigenul \u00een astfel de circumstan\u021be neobi\u0219nuite.<\/p>\n<p>Cercet\u0103rile anterioare ale lui Geiger au implicat studii care implic\u0103 modul \u00een care rugina \u0219i apa s\u0103rat\u0103 pot genera electricitate, ceea ce i-a determinat pe cei doi s\u0103 \u00eenceap\u0103 s\u0103 investigheze posibilitatea ca nodulii polimetalici care prolifereaz\u0103 pe fundul m\u0103rii s\u0103 genereze suficient\u0103 electricitate pentru a explica prezen\u021ba oxigenului rezultat din electroliza apei de mare.<\/p>\n<p>Doar 1,5 vol\u021bi &#8211; aproximativ tensiunea unei baterii AA tipice &#8211; furnizeaz\u0103 suficient\u0103 energie pentru a \u00eemp\u0103r\u021bi apa de mare \u00een hidrogen \u0219i oxigen. \u00cen timpul test\u0103rii, s-a observat c\u0103 nodulii metalici individuali produc p\u00e2n\u0103 la 0,95 vol\u021bi \u0219i, de\u0219i surprinz\u0103tor \u00een sine, acest lucru este cu mult sub tensiunea necesar\u0103 pentru electroliz\u0103. Cu toate acestea, Sweetman \u0219i Geiger au descoperit c\u0103 atunci c\u00e2nd sunt grupa\u021bi \u00eempreun\u0103, mai mul\u021bi noduli pot func\u021biona \u00een esen\u021b\u0103 la fel ca mai multe baterii conectate \u00eentr-o serie, oferind o tensiune suficient\u0103 pentru a produce oxigen.<\/p>\n<p><strong>Sursa<\/strong>: studiul \u015ftiin\u0163ific <a href=\"https:\/\/www.nature.com\/articles\/s41561-024-01480-8\" target=\"_blank\" rel=\"noopener\"><strong>&#8222;Evidence of dark oxygen production at the abyssal seafloor&#8221; \/ nature.com<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Oamenii de \u0219tiin\u021b\u0103 au descoperit minerale metalice pe fundul oceanului, minerale care produc &#8222;oxigen \u00eentunecat&#8221;, conform descoperirilor prezentate \u00eentr-un nou studiu care ar putea r\u0103sturna presupunerile din trecut c\u0103 oxigenul planetei noastre este produs exclusiv de organisme fotosintetice. Descoperirea, f\u0103cut\u0103 &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Descoperire captivant\u0103 a oamenilor de \u015ftiin\u0163\u0103: s-a g\u0103sit &#8222;oxigen \u00eentunecat&#8221; pe fundul oceanelor! Se schimb\u0103 teoria privind apari\u0163ia vie\u0163ii&#8230;\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/descoperire-captivanta-a-oamenilor-de-stiinta-s-a-gasit-oxigen-intunecat-pe-fundul-oceanelor-se-schimba-teoria-privind-aparitia-vietii\/#more-92092\" aria-label=\"Cite\u0219te mai multe despre Descoperire captivant\u0103 a oamenilor de \u015ftiin\u0163\u0103: s-a g\u0103sit &#8222;oxigen \u00eentunecat&#8221; pe fundul oceanelor! Se schimb\u0103 teoria privind apari\u0163ia vie\u0163ii&#8230;\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":92094,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[54],"tags":[4116,2623,5318,4514,1755,2635,2534,952,5512,9800,4645,4228,1604,1973,1692,105,732,2364,366],"class_list":["post-92092","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-natura-animale","tag-baseball","tag-baterie","tag-cobalt","tag-cupru","tag-electricitate","tag-hidrogen","tag-litiu","tag-lumina","tag-mangan","tag-natura-animale","tag-nichel","tag-nisip","tag-ocean","tag-oceanul-pacific","tag-oxigen","tag-pamant","tag-planeta","tag-revista","tag-viata","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v24.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Descoperire captivant\u0103 a oamenilor de \u015ftiin\u0163\u0103: s-a g\u0103sit &quot;oxigen \u00eentunecat&quot; pe fundul oceanelor! 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