{"id":119614,"date":"2015-03-25T11:00:42","date_gmt":"2015-03-25T11:00:42","guid":{"rendered":"https:\/\/bm.dev.synology.me\/?p=119614"},"modified":"2015-03-25T11:00:42","modified_gmt":"2015-03-25T11:00:42","slug":"o-noua-molecula-indispensabila-vietii-descoperita-pe-planeta-marte","status":"publish","type":"post","link":"https:\/\/bm.dev.synology.me\/?p=119614","title":{"rendered":"O nou\u0103 molecul\u0103 indispensabil\u0103 vie\u0163ii, descoperit\u0103 pe planeta Marte"},"content":{"rendered":"<p>\n<strong>Nitra\u0163ii reprezint\u0103 o categorie de molecule care con\u0163in azot sub o form\u0103 ce poate fi utilizat\u0103 de c\u0103tre organismele vii, a explicat agen\u0163ia spa\u0163ial\u0103 american\u0103. Aceast\u0103 descoperire a adus astfel o dovad\u0103 \u00een plus a faptului c\u0103 Marte a reunit \u00een trecut condi\u0163ii propice pentru existen\u0163a vie\u0163ii.<\/strong><\/p>\n<p>\nAzotul este indispensabil pentru toate formele de via\u0163\u0103 cunoscute, \u00eentruc\u00e2t el reprezint\u0103 un element-cheie pentru molecule mai mari, precum ADN-ul, care codific\u0103 instruc\u0163iunile genetice ale vie\u0163ii. Pe Terra, ca \u015fi pe Marte, azotul se afl\u0103 \u00een stare gazoas\u0103 \u00een atmosfer\u0103, sub forma a doi atomi ata\u015fa\u0163i unul de altul care, astfel, nu pot s\u0103 se combine prea u\u015for cu alte molecule.<\/p>\n<p>\n\u00cens\u0103 atomii de azot trebuie s\u0103 fie ori singuri, ori fixa\u0163i de molecule de oxigen, pentru a putea genera acele reac\u0163ii chimice care sunt indispensabile vie\u0163ii.<\/p>\n<p>\n<strong>O molecul\u0103 de nitrat, alc\u0103tuit\u0103 dintr-un atom de azot \u015fi trei atomi de oxigen, reprezint\u0103 o surs\u0103 de azot deja fixat \u015fi care poate astfel s\u0103 se combine apoi cu o varietate de al\u0163i atomi \u015fi de molecule.<\/strong><\/p>\n<p>\nTotu\u015fi, oamenii de \u015ftiin\u0163\u0103 americani au subliniat faptul c\u0103 nu exist\u0103 deocamdat\u0103 niciun indiciu care s\u0103 sugereze c\u0103 acele molecule de nitrat, descoperite de un instrument aflat la bordul roverului mar\u0163ian Curiosity, ar proveni de la un organism viu. Suprafa\u0163a lui Marte este \u00een prezent complet neospitalier\u0103 pentru orice form\u0103 de via\u0163\u0103 cunoscut\u0103.<\/p>\n<p>\n<strong>Potrivit oamenilor de \u015ftiin\u0163\u0103 de la NASA, acei nitra\u0163i sunt foarte vechi \u015fi au rezultat din procese non-biologice, cum ar fi de exemplul impactul cu asteroizi sau producerea de fulgere pe Marte, \u00eentr-un trecut \u00eendep\u0103rtat.<\/strong><\/p>\n<p>\nCercet\u0103torii care particip\u0103 la misiunea Curiosity au descoperit deja indicii care dovedesc faptul c\u0103 via\u0163a ar fi putut s\u0103 existe pe Marte \u00een urm\u0103 cu mai multe miliarde de ani, precum prezen\u0163a din abunden\u0163\u0103 a apei lichide, a\u015fa cum dovedesc albiile unor foste r\u00e2uri \u015fi prezen\u0163a de materii organice \u00een craterul Gale, \u00een care robotul american s-a plasat cu succes \u00een august 2012.<\/p>\n<p>\nDup\u0103 un scurtcircuit produs la \u00eenceputul lunii martie, robotul american \u015fi-a reluat drumul cu succes \u00een aceast\u0103 s\u0103pt\u0103m\u00e2n\u0103 c\u0103tre Muntele Sharp, destina\u0163ia sa final\u0103.<\/p>\n<p>\n<strong>Robotul Curiosity, cel mai sofisticat robot explorator trimis vreodat\u0103 de oameni pe o alt\u0103 planet\u0103, realizat cu un cost total de 2,5 miliarde de dolari, este operat de inginerii de la NASA din Laboratorul Pasadena din California.<\/strong><\/p>\n<p>\n<a name=\"13944740!\"><\/a><\/p>\n<p>\n<a name=\"13834651!\"><\/a><\/p>\n<p>\n<a name=\"13771105!\"><\/a><\/p>\n<p>\n<a name=\"13748633!\"><\/a><\/p>\n<p>\n&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Oamenii de \u015ftiin\u0163\u0103 americani au folosit unul dintre instrumentele aflate la bordul roverului mar\u0163ian Curiosity \u015fi au detectat pentru prima dat\u0103 azot la suprafa\u0163a planetei Marte, sub form\u0103 de nitrat (NO3), un element esen\u0163ial al vie\u0163ii, a anun\u0163at mar\u0163i NASA, informeaz\u0103 20minutes.fr.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[510],"tags":[39939,25983,39938],"class_list":["post-119614","post","type-post","status-publish","format-standard","hentry","category-actualitate","tag-azot","tag-marte","tag-nitrat"],"_links":{"self":[{"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=\/wp\/v2\/posts\/119614","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=119614"}],"version-history":[{"count":0,"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=\/wp\/v2\/posts\/119614\/revisions"}],"wp:attachment":[{"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=119614"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=119614"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bm.dev.synology.me\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=119614"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}