{"id":5187,"date":"2009-10-15T17:43:52","date_gmt":"2009-10-15T17:43:52","guid":{"rendered":"http:\/\/ibecbarcelona.eu\/new\/nova-teoria-evolutiva-sobre-lorigen-dels-animals\/"},"modified":"2015-02-05T17:10:08","modified_gmt":"2015-02-05T17:10:08","slug":"nova-teoria-evolutiva-sobre-lorigen-dels-animals","status":"publish","type":"post","link":"https:\/\/ibecbarcelona.eu\/ca\/nova-teoria-evolutiva-sobre-lorigen-dels-animals\/","title":{"rendered":"Nova teoria evolutiva sobre l\u2019origen dels animals"},"content":{"rendered":"

Xavier Fern\u00e0ndez-Busquets, de l\u2019Institut de Bioenginyeria de Catalunya\u00a0i de l’Institut de Nanoci\u00e8ncia i Nanotecnologia de la UB (IN2UB), i Dario Anselmetti, de la Universitat de Bielefeld, juntament amb altres investigadors del Friedrich Miescher Institute de Basilea i el Laboratori de Biologia Marina de Woods Hole, a Massachusetts, publicaran al n\u00famero de novembre de \u201cMolecular Biology and Evolution\u201c (ja disponible \u201con line\u201d), els seus resultats biof\u00edsics de mol\u00e8cula \u00fanica sobre l\u2019efecte del calci en la interacci\u00f3 de les mol\u00e8cules d\u2019adhesi\u00f3 en esponges marines.<\/p>\n

Aquests organismes tenen una organitzaci\u00f3 simple i els hi manquen teixits especialitzats o c\u00e8l\u00b7lules neuronals. No obstant, han sobreviscut 600 milions d\u2019anys gaireb\u00e9 sense canvis i es consideren un gra\u00f3 entre l\u2019era Precambriana, dominada per organismes unicel\u00b7lulars, i la Postcambriana, en la que es va produir la gran diversificaci\u00f3 dels animals multicel\u00b7lulars (metazoos).<\/p>\n

Els investigadors presenten una nova teoria segons la qual el sobtat i massiu increment de la concentraci\u00f3 de calci a l\u2019aigua del mar de l\u2019era Cambriana \u2013que es creu va ser resultat de l\u2019activitat volc\u00e0nica de les zones entre plaques tect\u00f2niques suboce\u00e0niques\u2013 va constituir un factor essencial per a l\u2019agregaci\u00f3 i l\u2019estabilitzaci\u00f3 de les estructures multicel\u00b7lulars de les esponges primitives. Aix\u00f2 ha perm\u00e8s formular una nova teoria en la que el contingut oce\u00e0nic de calci podria ser clau per entendre l\u2019explosi\u00f3 de la vida a l\u2019era Cambriana.<\/p>\n

Aquest article constitueix la primera investigaci\u00f3 en la que els estudis d\u2019espectrosc\u00f2pia de for\u00e7a de mol\u00e8cula \u00fanica han proporcionat respostes significatives a una q\u00fcesti\u00f3 amb profundes connotacions en biologia evolutiva como \u00e9s l\u2019origen dels animals multicel\u00b7lulars i pot representar una fita i un exemple de com la multidisciplinarietat i la col\u00b7laboraci\u00f3 s\u00f3n essencials per a l\u2019excel\u00b7l\u00e8ncia en la ci\u00e8ncia contempor\u00e0nia.<\/p>\n

—<\/p>\n

Article:<\/em><\/strong> \u201cSelf-Recognition and Ca2+-Dependent Carbohydrate\u2013Carbohydrate Cell Adhesion Provide Clues to the Cambrian Explosion\u201d.<\/a>\u00a0 Molecular Biology and Evolution<\/em>.\u00a0Autors: Xavier Fern\u00e1ndez-Busquets, Andr\u00e9 K\u00f6rnig, Iwona Bucior, Max M. Burger, and Dario Anselmetti.<\/p>\n","protected":false},"excerpt":{"rendered":"

L\u2019explosi\u00f3 Cambriana \u00e9s \u00e0mpliament considerada un dels episodis m\u00e9s rellevants de la hist\u00f2ria de la vida sobre la Terra, amb l\u2019aparici\u00f3 per primera vegada en el registre f\u00f2ssil de gran part de les divisions dels animals.<\/h3>\n

No obstant, les causes d\u2019aquest origen han estat objecte de debat durant d\u00e8cades i la pregunta de qu\u00e8 va desencadenar l\u2019organitzaci\u00f3 dels microorganismes unicel\u00b7lulars de l\u2019era Precambriana (fa 500 milions d\u2019anys) en organismes multicel\u00b7lulars ha estat sense resposta fins ara. <\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[96],"tags":[],"post_formats":[],"class_list":["post-5187","post","type-post","status-publish","format-standard","hentry","category-noticies-de-recerca"],"yoast_head":"\nNova teoria evolutiva sobre l\u2019origen dels animals - Institute for Bioengineering of Catalonia<\/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:\/\/ibecbarcelona.eu\/ca\/nova-teoria-evolutiva-sobre-lorigen-dels-animals\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Nova teoria evolutiva sobre l\u2019origen dels animals - Institute for Bioengineering of Catalonia\" \/>\n<meta property=\"og:description\" content=\"L\u2019explosi\u00f3 Cambriana \u00e9s \u00e0mpliament considerada un dels episodis m\u00e9s rellevants de la hist\u00f2ria de la vida sobre la Terra, amb l\u2019aparici\u00f3 per primera vegada en el registre f\u00f2ssil de gran part de les divisions dels animals. 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