{"id":16696,"date":"2017-05-24T15:05:54","date_gmt":"2017-05-24T15:05:54","guid":{"rendered":"https:\/\/cnpem.staging.wpengine.com\/?p=16696\/"},"modified":"2022-01-21T15:45:03","modified_gmt":"2022-01-21T18:45:03","slug":"de-olho-e-musculos-nos-fosseis-de-peixes","status":"publish","type":"post","link":"https:\/\/cnpem.br\/en\/de-olho-e-musculos-nos-fosseis-de-peixes\/","title":{"rendered":"De olho (e m\u00fasculos) nos f\u00f3sseis de peixes"},"content":{"rendered":"<p>Tudo o que sabemos sobre os seres vivos que viveram h\u00e1 milhares e milh\u00f5es de anos vem dos f\u00f3sseis que eles deixaram para tr\u00e1s. A forma\u00e7\u00e3o de f\u00f3sseis \u00e9 um fen\u00f4meno extremamente raro. Ela depende do soterramento do organismo, de processos qu\u00edmicos respons\u00e1veis pela sua conserva\u00e7\u00e3o e da n\u00e3o destrui\u00e7\u00e3o do f\u00f3ssil resultante por processos geol\u00f3gicos posteriores.<\/p>\n<p>Os processos qu\u00edmicos da fossiliza\u00e7\u00e3o devem ocorrer rapidamente, antes da decomposi\u00e7\u00e3o total dos tecidos por microrganismos. Na grande maioria das vezes, apenas tecidos duros, como ossos e conchas, s\u00e3o preservados. Tecidos moles, como m\u00fasculos, s\u00e3o facilmente decompostos e por isso raramente s\u00e3o preservados em f\u00f3sseis. No entanto, quando preservados, s\u00e3o uma grande fonte de informa\u00e7\u00f5es sobre a evolu\u00e7\u00e3o dos organismos e o contexto ecol\u00f3gico em que eles estavam inseridos.<\/p>\n<p>Um grupo multidisciplinar de pesquisadores da Universidade de S\u00e3o Paulo, da Universidade Estadual Paulista, das universidades federais de S\u00e3o Carlos, Ouro Preto e de Pernambuco, e do Laborat\u00f3rio Nacional de Luz S\u00edncrotron (LNLS) utilizou as instala\u00e7\u00f5es do LNLS e do Laborat\u00f3rio Nacional de Nanotecnologia (LNNano) para investigar os mecanismos por tr\u00e1s da forma\u00e7\u00e3o de f\u00f3sseis com partes moles particularmente bem preservadas.<\/p>\n<p>Os f\u00f3sseis investigados s\u00e3o de peixes da esp\u00e9cie <em>Dastilbe crandalli,<\/em> do per\u00edodo Cret\u00e1ceo (entre 145 e 66 milh\u00f5es de anos atr\u00e1s), extra\u00eddos da Forma\u00e7\u00e3o Santana, na Bacia do Araripe, no estado do Cear\u00e1.<\/p>\n<p>&nbsp;<\/p>\n<div id=\"attachment_42028\" style=\"width: 402px\" class=\"wp-caption alignleft\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-42028\" class=\"wp-image-42028 size-medium\" src=\"https:\/\/i0.wp.com\/lnls.cnpem.staging.wpengine.com\/wp-content\/uploads\/2017\/05\/05242017.png?resize=392%2C300\" sizes=\"auto, (max-width: 392px) 100vw, 392px\" srcset=\"https:\/\/i0.wp.com\/lnls.cnpem.staging.wpengine.com\/wp-content\/uploads\/2017\/05\/05242017.png?resize=392%2C300 392w, https:\/\/i0.wp.com\/lnls.cnpem.staging.wpengine.com\/wp-content\/uploads\/2017\/05\/05242017.png?resize=784%2C600 784w, https:\/\/i0.wp.com\/lnls.cnpem.staging.wpengine.com\/wp-content\/uploads\/2017\/05\/05242017.png?w=1094 1094w\" alt=\"\" width=\"392\" height=\"300\" \/><p id=\"caption-attachment-42028\" class=\"wp-caption-text\"><em>Legenda: (a) F\u00f3ssil preservado no calc\u00e1rio cinza (escala 1,5 cm). (b) Corte transversal do f\u00f3ssil mostrando v\u00e9rtebras preenchidas por calcita (1), v\u00e9rtebras (2) e tecidos moles (3) (escala 0,5 mm). (d) Regi\u00e3o destacada para an\u00e1lise por fluoresc\u00eancia de raios X. (escala 2 mm) (e-g) Mapas de diversos elementos distribu\u00eddos na regi\u00e3o destacada, respectivamente, C\u00e1lcio (vermelho) e Ferro (verde), C\u00e1lcio (vermelho) e Cobre (azul), e Zinco.<\/em><\/p><\/div>\n<p>s exemplares foram encontrados conservados em dois tipos de calc\u00e1rio, bege e cinza, diferenciados pela quantidade de mat\u00e9ria org\u00e2nica presente. Por meio de t\u00e9cnicas de an\u00e1lise que inclu\u00edram a Microscopia Eletr\u00f4nica de Varredura (feita no LNNano) e Espectroscopia por Fluoresc\u00eancia de Raios X (realizada na Linha de Luz XRF do LNLS), os pesquisadores puderam observar que as amostras passaram por processos distintos de fossiliza\u00e7\u00e3o.<\/p>\n<p>Nos f\u00f3sseis formados no calc\u00e1rio bege, os tecidos moles foram preservados pela deposi\u00e7\u00e3o do mineral pirita (<span id=\"MathJax-Element-1-Frame\" class=\"MathJax\" style=\"box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; font-size: 14px; vertical-align: baseline; outline: 0px; background: 0px 0px; display: inline; font-style: normal; font-weight: normal; line-height: normal; text-indent: 0px; text-align: left; text-transform: none; letter-spacing: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;\" tabindex=\"0\" data-mathml=\"&lt;math xmlns=&quot;https:\/\/www.w3.org\/1998\/Math\/MathML&quot;&gt;&lt;mi mathvariant=&quot;normal&quot;&gt;F&lt;\/mi&gt;&lt;mi mathvariant=&quot;normal&quot;&gt;e&lt;\/mi&gt;&lt;msub&gt;&lt;mi mathvariant=&quot;normal&quot;&gt;S&lt;\/mi&gt;&lt;mn&gt;2&lt;\/mn&gt;&lt;\/msub&gt;&lt;\/math&gt;\"><span id=\"MathJax-Span-1\" class=\"math\"><span id=\"MathJax-Span-2\" class=\"mrow\"><span id=\"MathJax-Span-3\" class=\"mi\">F<\/span><span id=\"MathJax-Span-4\" class=\"mi\">e<\/span><span id=\"MathJax-Span-5\" class=\"msubsup\"><span id=\"MathJax-Span-6\" class=\"mi\">S<\/span><span id=\"MathJax-Span-7\" class=\"mn\">2<\/span><\/span><\/span><\/span><span class=\"MJX_Assistive_MathML\">FeS2<\/span><\/span>). J\u00e1 no caso do calc\u00e1rio cinza, os tecidos foram fossilizados pela forma\u00e7\u00e3o de querog\u00eanio, uma forma qu\u00edmica est\u00e1vel do carbono formada a partir da parte insol\u00favel da mat\u00e9ria org\u00e2nica submetida a altas press\u00f5es. Ambos os processos ocorrem por meio da respira\u00e7\u00e3o anaer\u00f3bica de bact\u00e9rias que agem na decomposi\u00e7\u00e3o da carca\u00e7a. Uma sedimenta\u00e7\u00e3o lenta leva \u00e0 piritiza\u00e7\u00e3o dos tecidos moles, enquanto taxas maiores de sedimenta\u00e7\u00e3o favorecem a forma\u00e7\u00e3o dos f\u00f3sseis por querogeniza\u00e7\u00e3o, j\u00e1 que estes processos ocorrem em zonas distintas do sedimento.<\/p>\n<p>Os pesquisadores puderam tamb\u00e9m verificar que qualidade a da preserva\u00e7\u00e3o dos f\u00f3sseis foi maior naqueles formados pelo processo de piritiza\u00e7\u00e3o e, segundo o pesquisador correspondente, Gabriel Os\u00e9s, este \u00e9 o primeiro registro de tecidos moles de vertebrados preservados por este processo.<\/p>\n<p><strong>Fonte:<\/strong> Gabriel L. Os\u00e9s, Setembrino Petri, Cibele G. Voltani, Gustavo M. E. M. Prado, Douglas Galante, Marcia A. Rizzutto, Isaac D. Rudnitzki, Evandro P. da Silva, Fabio Rodrigues, Elidiane C. Rangel, Paula A. Sucerquia &amp; M\u00edrian L. A. F. Pacheco, Deciphering pyritization-kerogenization gradient for fish soft-tissue preservation. Scientific Reports 7, 1468 (2017), doi:10.1038\/s41598-017-01563-0.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tudo o que sabemos sobre os seres vivos que viveram h\u00e1 milhares e milh\u00f5es de anos vem dos f\u00f3sseis que eles deixaram para tr\u00e1s. A forma\u00e7\u00e3o de f\u00f3sseis \u00e9 um&hellip;<\/p>\n","protected":false},"author":17,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[615],"tags":[],"class_list":["post-16696","post","type-post","status-publish","format-standard","hentry","category-releases-lnls","category-615","description-off"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>De olho (e m\u00fasculos) nos f\u00f3sseis de peixes - CNPEM<\/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:\/\/cnpem.br\/de-olho-e-musculos-nos-fosseis-de-peixes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"De olho (e m\u00fasculos) nos f\u00f3sseis de peixes - CNPEM\" \/>\n<meta property=\"og:description\" content=\"Tudo o que sabemos sobre os seres vivos que viveram h\u00e1 milhares e milh\u00f5es de anos vem dos f\u00f3sseis que eles deixaram para tr\u00e1s. 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