{"id":33537,"date":"2017-10-09T13:27:20","date_gmt":"2017-10-09T10:27:20","guid":{"rendered":"http:\/\/btv.md\/?p=33537"},"modified":"2017-10-09T13:27:20","modified_gmt":"2017-10-09T10:27:20","slug":"cum-a-aparut-viata-pe-terra-teoria-care-schimba-istoria","status":"publish","type":"post","link":"https:\/\/www.btv.md\/ro\/cum-a-aparut-viata-pe-terra-teoria-care-schimba-istoria\/","title":{"rendered":"Cum a ap\u0103rut via\u021ba pe Terra: Teoria care schimb\u0103 istoria"},"content":{"rendered":"<p class=\"post-text-desc\"><strong>Un studiu realizat de cercet\u0103torii din Canada sprijin\u0103 teoria potrivit c\u0103reia meteori\u021bii care au c\u0103zut \u00een m\u0103rile calde de pe Terra au adus cu ei elementele esen\u021biale pentru apari\u021bia primelor forme de via\u021b\u0103 pe planeta noastr\u0103.<\/strong><\/p>\n<p>Noul studiu are la baz\u0103 \u201ccercet\u0103ri exhaustive \u0219i calcule\u201d astrofizice, geologice, chimice \u0219i biologice, potrivit cercet\u0103torilor de la Universitatea McMaster din ora\u0219ul canadian Hamilton, a c\u0103ror cercetare a fost publicat\u0103 \u00een Proceedings of the National Academy of Sciences of the United States of America (PNAS), citeaz\u0103\u00a0<a href=\"http:\/\/independent.md\/studiu-cum-aparut-viata-pe-terra-teoria-care-schimba-istoria\/#.Wdsm6Wi0OUl\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">Independent.md<\/a>.\u00a0<\/p>\n<p>Poten\u021bialul apari\u021biei vie\u021bii \u00een acele \u201cmici m\u0103ri calde\u201d a fost evocat de biologul britanic Charles Darwin, p\u0103rintele teoriei evolu\u021biei speciilor, \u00eentr-o scrisoare din 1871.<\/p>\n<blockquote>\n<p>\u201c<em>Dar dac\u0103 am putea s\u0103 concepem c\u0103 \u00eentr-o mic\u0103 mare cald\u0103, \u00een prezen\u021ba a tot felul de s\u0103ruri de amoniac \u0219i acid fosforic, a luminii, c\u0103ldurii, electricit\u0103\u021bii etc., un compus proteic s-a format pe cale chimic\u0103, preg\u0103tit s\u0103 suporte schimb\u0103ri \u00eenc\u0103 \u0219i mai complexe<\/em>\u201d, scria celebrul savant britanic \u00een acel text.<\/p>\n<\/blockquote>\n<p>De atunci, oamenii de \u0219tiin\u021b\u0103 opun aceast\u0103 ipotez\u0103 aceleia potrivit c\u0103reia apari\u021bia vie\u021bii pe Terra se datoreaz\u0103 pu\u021burilor hidrotermale de pe fundurile oceanelor.<\/p>\n<p>Noul studiu sugereaz\u0103 c\u0103 prima teorie are un grad mai mare de probabilitate, deoarece un ciclu de tip \u201cperioad\u0103 secetoas\u0103 \u2014 perioad\u0103 umed\u0103\u201d a fost necesar pentru a permite conectarea blocurilor moleculare de baz\u0103 \u0219i formarea unor molecule autoreplicante de acid ribonucleic (ARN).<\/p>\n<p>Aceste molecule de ARN constituie primul cod genetic al vie\u021bii terestre, ap\u0103r\u00e2nd \u00eenainte de celebrul ADN, potrivit cercet\u0103torilor canadieni cita\u021bi de AFP \u0219i Agerpres.<\/p>\n<blockquote>\n<p>\u201c<em>Pentru a \u00een\u021belege originea vie\u021bii, trebuie s\u0103 \u00een\u021belegem Terra de acum c\u00e2teva miliarde de ani<\/em>\u201d, a declarat Thomas Henning, cercet\u0103tor la Institutul Max Planck din Germania.<\/p>\n<p>\u201c<em>A\u0219a cum arat\u0103 studiul nostru, astronomia a furnizat o parte crucial\u0103 a r\u0103spunsului. Datele despre modul \u00een care Sistemul Solar s-a format au consecin\u021be directe asupra originii vie\u021bii de pe Terra<\/em>\u201d, a afirmat acela\u0219i om de \u0219tiin\u021b\u0103, citat luni de AFP.<\/p>\n<\/blockquote>\n<p>\u00cen urm\u0103 cu 3,7 miliarde de ani \u2014 4,5 miliarde de ani, planeta noastr\u0103 era bombardat\u0103 de meteori\u021bi cu un ritm de 8-11 ori mai mare dec\u00e2t \u00een prezent. Atmosfera de atunci era \u201cdominat\u0103 de gaze vulcanice \u0219i solul era rar, \u00eentruc\u00e2t continentele abia se ridicau de pe fundul oceanului mondial\u201d, potrivit acestui studiu.<\/p>\n<p>La un moment dat, ingredientele necesare form\u0103rii unor polimeri de RNA au ajuns la concentra\u021bii suficiente \u00een lacuri \u0219i s-au conectat \u00eentre ele, \u00een timp ce nivelul apei fluctua \u00een func\u021bie de ritmul precipita\u021biilor, evapor\u0103rilor \u0219i scurgerilor.<\/p>\n<p>Acele forme primitive de via\u021b\u0103 au evoluat p\u00e2n\u0103 la dezvoltarea ADN-ului, considerat \u201cprea complex pentru a fi primul element de via\u021b\u0103 ce a ap\u0103rut pe Terra\u201d, potrivit explica\u021biilor oferite de Ralph Pudritz, cercet\u0103tor la Universitatea McMaster. \u201cVia\u021ba a trebuit s\u0103 \u00eenceap\u0103 prin altceva, iar acel altceva a fost ARN-ul\u201d, a ad\u0103ugat el.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un studiu realizat de cercet\u0103torii din Canada sprijin\u0103 teoria potrivit c\u0103reia meteori\u021bii care au c\u0103zut \u00een m\u0103rile calde de pe Terra au adus cu ei elementele esen\u021biale pentru apari\u021bia primelor forme de via\u021b\u0103 pe planeta noastr\u0103. Noul studiu are la baz\u0103 \u201ccercet\u0103ri exhaustive \u0219i calcule\u201d astrofizice, geologice, chimice \u0219i biologice, potrivit cercet\u0103torilor de la Universitatea [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":33538,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[],"class_list":["post-33537","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-externe"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cum a ap\u0103rut via\u021ba pe Terra: Teoria care schimb\u0103 istoria<\/title>\n<meta name=\"description\" content=\"Un studiu realizat de cercet\u0103torii din Canada sprijin\u0103 teoria potrivit c\u0103reia meteori\u021bii care au c\u0103zut \u00een m\u0103rile calde de pe Terra au adus cu ei elementele.\" \/>\n<meta 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