{"id":16494,"date":"2026-10-02T15:08:26","date_gmt":"2026-10-02T15:08:26","guid":{"rendered":"https:\/\/www.lifescienceart.com\/?p=16494"},"modified":"2026-10-02T15:08:26","modified_gmt":"2026-10-02T15:08:26","slug":"chirality-of-life-building-blocks","status":"publish","type":"post","link":"https:\/\/www.lifescienceart.com\/ro\/science\/biology\/chirality-of-life-building-blocks\/","title":{"rendered":"Hiralitatea: Lateralitatea esen\u021bial\u0103 a moleculelor din via\u021b\u0103 \u0219i univers"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Hiralitatea: Lateralitatea blocurilor de construc\u021bie ale vie\u021bii<\/h2>\n\n<h2 class=\"wp-block-heading\">Ce este hiralitatea?<\/h2>\n\n<p class=\"wp-block-paragraph\">Hiralitatea se refer\u0103 la \u201elateralitatea\u201d moleculelor, \u00een sensul c\u0103 acestea pot exista \u00een dou\u0103 forme \u00een oglind\u0103. Exact ca m\u00e2na dreapt\u0103 \u0219i st\u00e2nga ta, care sunt imagini \u00een oglind\u0103 una fa\u021b\u0103 de alta, moleculele chirale au variante \u201est\u00e2ngace\u201d \u0219i \u201edreptace\u201d.<\/p>\n\n<h2 class=\"wp-block-heading\">Homohiralitatea \u00een via\u021ba de pe P\u0103m\u00e2nt<\/h2>\n\n<p class=\"wp-block-paragraph\">\u00cen mod remarcabil, to\u021bi aminoacizii \u0219i zaharurile care constituie via\u021ba pe P\u0103m\u00e2nt sunt homohirali, adic\u0103 exist\u0103 \u00eentr-o singur\u0103 lateralitate. Aminoacizii sunt st\u00e2ngaci, \u00een timp ce zaharurile sunt dreptaci. Acest fenomen este cunoscut sub denumirea de homohiralitate.<\/p>\n\n<h2 class=\"wp-block-heading\">Originile homohiralit\u0103\u021bii<\/h2>\n\n<p class=\"wp-block-paragraph\">Originile homohiralit\u0103\u021bii r\u0103m\u00e2n un mister. O ipotez\u0103 este c\u0103 lumina polarizat\u0103 din spa\u021biu ar fi putut distruge aminoacizii dreptaci, duc\u00e2nd la un exces de aminoacizi st\u00e2ngaci. O alt\u0103 teorie sugereaz\u0103 c\u0103 reac\u021biile chimice de pe P\u0103m\u00e2ntul timpuriu ar fi putut amplifica acest exces.<\/p>\n\n<h2 class=\"wp-block-heading\">Este homohiralitatea esen\u021bial\u0103 pentru via\u021b\u0103?<\/h2>\n\n<p class=\"wp-block-paragraph\">De\u0219i homohiralitatea este o caracteristic\u0103 a vie\u021bii pe P\u0103m\u00e2nt, nu este clar dac\u0103 este esen\u021bial\u0103 pentru via\u021b\u0103 \u00een general. Unii oameni de \u0219tiin\u021b\u0103 cred c\u0103 via\u021ba ar putea exista utiliz\u00e2nd at\u00e2t blocuri de construc\u021bie st\u00e2ngace, c\u00e2t \u0219i dreptace. Totu\u0219i, aceasta r\u0103m\u00e2ne un subiect de cercetare \u00een curs.<\/p>\n\n<h2 class=\"wp-block-heading\">Hiralitatea \u00een spa\u021biul interstelar<\/h2>\n\n<p class=\"wp-block-paragraph\">Moleculele chirale au fost detectate \u00een spa\u021biul interstelar, suger\u00e2nd c\u0103 fenomenul ar putea fi r\u0103sp\u00e2ndit \u00een univers. Cercet\u0103torii investigheaz\u0103 dac\u0103 exist\u0103 un exces de o anumit\u0103 lateralitate \u00een aceste molecule interstelare.<\/p>\n\n<h2 class=\"wp-block-heading\">Pot formele de via\u021b\u0103 s\u0103 foloseasc\u0103 ambele lateralit\u0103\u021bi?<\/h2>\n\n<p class=\"wp-block-paragraph\">Posibilitatea ca formele de via\u021b\u0103 s\u0103 utilizeze at\u00e2t blocuri de construc\u021bie st\u00e2ngace, c\u00e2t \u0219i dreptace r\u0103m\u00e2ne o \u00eentrebare deschis\u0103. Unele bacterii de pe P\u0103m\u00e2nt pot transforma aminoacizii dreptaci \u00een st\u00e2ngaci, dar nu se \u0219tie dac\u0103 aceast\u0103 capacitate este r\u0103sp\u00e2ndit\u0103.<\/p>\n\n<h2 class=\"wp-block-heading\">Amplificarea lateralit\u0103\u021bii<\/h2>\n\n<p class=\"wp-block-paragraph\">Oamenii de \u0219tiin\u021b\u0103 au f\u0103cut progrese \u00een amplificarea excesului unei anumite lateralit\u0103\u021bi \u00een reac\u021bii chimice. Totu\u0219i, \u00eenc\u0103 sunt departe de a \u00een\u021belege toate procesele chimice care ar fi putut contribui la homohiralitatea pe P\u0103m\u00e2ntul timpuriu.<\/p>\n\n<h2 class=\"wp-block-heading\">Cercet\u0103ri \u00een desf\u0103\u0219urare<\/h2>\n\n<p class=\"wp-block-paragraph\">Cercet\u0103torii continu\u0103 s\u0103 exploreze misterele hiralit\u0103\u021bii \u0219i homohiralit\u0103\u021bii. Prin investigarea moleculelor interstelare, studiul reac\u021biilor chimice \u0219i dezvoltarea de noi tehnologii, oamenii de \u0219tiin\u021b\u0103 sper\u0103 s\u0103 descopere originile \u0219i semnifica\u021bia acestei propriet\u0103\u021bi fundamentale a vie\u021bii.<\/p>","protected":false},"excerpt":{"rendered":"<p>Hiralitatea: Lateralitatea blocurilor de construc\u021bie ale vie\u021bii Ce este hiralitatea? Hiralitatea se refer\u0103 la \u201elateralitatea\u201d moleculelor, \u00een sensul c\u0103 acestea pot exista \u00een dou\u0103 forme \u00een oglind\u0103. Exact ca m\u00e2na&hellip;<\/p>\n","protected":false},"author":2,"featured_media":25598,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[288],"tags":[670,99,1216,21833,18553,21834,667,18135],"class_list":["post-16494","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-biology","tag-amino-acids","tag-lifescienceart","tag-astrobiology","tag-chirality","tag-handedness","tag-homochirality","tag-origins-of-life","tag-sugars"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/posts\/16494","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/comments?post=16494"}],"version-history":[{"count":2,"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/posts\/16494\/revisions"}],"predecessor-version":[{"id":25599,"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/posts\/16494\/revisions\/25599"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/media\/25598"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/media?parent=16494"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/categories?post=16494"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/tags?post=16494"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}