{"id":5005424,"date":"2006-06-28T22:45:06","date_gmt":"2006-06-28T20:45:06","guid":{"rendered":"https:\/\/criticalbiomass.blog.hu\/2006\/06\/28\/a_pok_halojaban_3"},"modified":"2006-06-28T22:45:06","modified_gmt":"2006-06-28T20:45:06","slug":"a_pok_halojaban_3","status":"publish","type":"post","link":"https:\/\/criticalbiomass.hu\/?p=5005424","title":{"rendered":"A p\u00f3k h\u00e1l\u00f3j\u00e1ban"},"content":{"rendered":"<p>\n<img align=\"left\" hspace=\"5\" src=\"http:\/\/www.sciencemag.org\/content\/vol312\/issue5781\/images\/small\/312_1761_F1.gif\" vspace=\"3\" \/><br \/>\nA p\u00f3kok az \u00e1llatvil\u00e1g legf\u00e9lelmetesebb \u00e9s legcslafint\u00e1bb ragadoz\u00f3i k\u00f6z\u00e9 tartoznak &#8211; m\u00e9ghozz\u00e1 a jelek szerint lassan imm\u00e1r k\u00f6zel m\u00e1sf\u00e9l-sz\u00e1z milli\u00f3 \u00e9ve. Ezt t\u00e1masztja al\u00e1 az a borosty\u00e1nba szorult 110 milli\u00f3 \u00e9ves \u0151si p\u00f3kh\u00e1l\u00f3 \u00e9s zs\u00e1km\u00e1nya, amelyre spanyol kutat\u00f3k leltek. A h\u00e1l\u00f3 form\u00e1ja a mai p\u00f3kh\u00e1l\u00f3kra eml\u00e9keztet (azaz sug\u00e1rir\u00e1nyban kifesz\u00edtett r\u00f6gz\u00edt\u0151sz\u00e1lakra ker\u00fcl egy ragad\u00f3s spir\u00e1l), \u00e9s ami a leg\u00e9rdekesebbek, hogy minden val\u00f3sz\u00edn\u0171s\u00e9g szerint m\u00e9g a pr\u00e9da megfog\u00e1s\u00e1ra odak\u00e9sz\u00edtett ragad\u00f3s cseppek is megfigyelhet\u0151k rajta.\n<\/p>\n<p>\nMa a p\u00f3kok k\u00e9t csoportja k\u00e9sz\u00edt ilyen szerkezet\u0171 h\u00e1l\u00f3kat: az Araneoidea \u00e9s a Deinopoidea. El\u0151bbiek a fentebb m\u00e1r eml\u00edtett m\u00f3don ragad\u00f3s nedvet v\u00e1lasztanak ki a h\u00e1l\u00f3jukra a t\u00e1pl\u00e1l\u00e9k megfog\u00e1s\u00e1hoz, m\u00edg ut\u00f3bbiak szofisztik\u00e1ltabb m\u00f3don, elektrosztatikusan teszik tapad\u00f3ss\u00e1 csapd\u00e1jukat. Ez a k\u00fcl\u00f6nbs\u00e9g azonban \u00e9pp el\u00e9g ahhoz, hogy komolyan felvess\u00fck a k\u00e9rd\u00e9st: a k\u00e9t csoport k\u00f6z\u00f6s \u0151st\u0151l sz\u00e1rmazik-e, avagy egym\u00e1st\u00f3l f\u00fcggetlen\u00fcl hoztak l\u00e9tre hasonl\u00f3 szerkezet\u0171 h\u00e1l\u00f3kat, azaz a konvergnes evol\u00faci\u00f3 egy eg\u00e9szen leny\u0171g\u00f6z\u0151 p\u00e9ld\u00e1j\u00e1val \u00e1llunk szemben. <img align=\"right\" hspace=\"5\" src=\"http:\/\/criticalbiomass.blog.hu\/media\/image\/200606\/pokhalo-phyl.gif\" vspace=\"3\" \/>Nos, a k\u00e9t csapat  h\u00e1l\u00f3j\u00e1t nagyon hasonl\u00f3 szerkezet\u0171 feh\u00e9rj\u00e9k alkotj\u00e1k, ami arra enged k\u00f6vetkeztetni, hogy az el\u0151bbi feltev\u00e9s a helyes, \u00e9s a k\u00f6z\u00f6s \u0151sben (aki minimum 136 milli\u00f3 \u00e9ve \u00e9lt) m\u00e1r jelen volt az a molekul\u00e1ris appar\u00e1tus, ami lehet\u0151v\u00e9 tette a h\u00e1l\u00f3sz\u00f6v\u00e9s.\n<\/p>\n<p>\nEz a 136 milli\u00f3 \u00e9v egy\u00e9bk\u00e9nt az\u00e9rt is izgalmas id\u0151szak, mert egybeesik a vir\u00e1gos n\u00f6v\u00e9nyek, illetve a nekt\u00e1rjukkal t\u00e1pl\u00e1lkoz\u00f3 \u00e9s \u0151ket beporz\u00f3 rovarok elterjed\u00e9s\u00e9vel, azaz val\u00f3sz\u00edn\u0171, hogy a hirtelen sz\u00e9lesed\u0151 t\u00e1pl\u00e1l\u00e9kv\u00e1laszt\u00e9k nyom\u00e1n k\u00f6vetkezett be &quot;keresztes bar\u00e1taink&quot; sokfajtas\u00e1g\u00e1nak kialakul\u00e1sa, azaz radi\u00e1ci\u00f3ja is.\n<\/p>\n<hr \/>\n<p><font size=\"1\"><br \/>\n<strong>Pe\u00f1alver E, Grimaldi DA, Decl\u00f2s X<\/strong> (2006) Early Cretaceous Spider Web with Its Prey. <em>Science<\/em> <strong>312<\/strong>: 1761.<br \/>\n<strong>Garb JE, DiMauro T, Vo V, Hayashi CY<\/strong> (2006) Silk Genes Support the Single Origin of Orb Webs. <em>Science<\/em> <strong>312<\/strong>: 1762.<br \/>\n<\/font><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A p\u00f3kok az \u00e1llatvil\u00e1g legf\u00e9lelmetesebb \u00e9s legcslafint\u00e1bb ragadoz\u00f3i k\u00f6z\u00e9 tartoznak &#8211; m\u00e9ghozz\u00e1 a jelek szerint lassan imm\u00e1r k\u00f6zel m\u00e1sf\u00e9l-sz\u00e1z milli\u00f3 \u00e9ve. Ezt t\u00e1masztja al\u00e1 az a borosty\u00e1nba szorult 110 milli\u00f3 \u00e9ves \u0151si p\u00f3kh\u00e1l\u00f3 \u00e9s zs\u00e1km\u00e1nya, amelyre spanyol kutat\u00f3k leltek. A &hellip; <a href=\"https:\/\/criticalbiomass.hu\/?p=5005424\">Egy kattint\u00e1s ide a folytat\u00e1shoz&#8230;. <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=\/wp\/v2\/posts\/5005424"}],"collection":[{"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5005424"}],"version-history":[{"count":0,"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=\/wp\/v2\/posts\/5005424\/revisions"}],"wp:attachment":[{"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5005424"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5005424"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5005424"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}