{"id":5005393,"date":"2006-04-28T10:52:29","date_gmt":"2006-04-28T08:52:29","guid":{"rendered":"https:\/\/criticalbiomass.blog.hu\/2006\/04\/28\/permian_park"},"modified":"2006-04-28T10:52:29","modified_gmt":"2006-04-28T08:52:29","slug":"permian_park","status":"publish","type":"post","link":"https:\/\/criticalbiomass.hu\/?p=5005393","title":{"rendered":"Permian Park"},"content":{"rendered":"


\nGondolom mindenki eml\u00e9kszik a Jurassic Park kezd\u0151 soraira, amikor a borosty\u00e1nk\u0151be ragadt sz\u00fanyogb\u00f3l izol\u00e1lj\u00e1k azt a v\u00e9rcseppet amib\u0151l azt\u00e1n szinte spont\u00e1n n\u00e9h\u00e1ny tucat din\u00f3 faj teljes genomi DNS-\u00e9t rekonstru\u00e1lj\u00e1k. El lehet vitatkozni azon, hogy a val\u00f3s\u00e1g jobb rendez\u0151-e mint Spielberg, mindenestre a k\u00f6vetkez\u0151 kish\u00edr alapsztorija k\u00eds\u00e9rtetiesen hasonl\u00edt n\u00e9h\u00e1ny l\u00e9p\u00e9sben a film forgat\u00f3k\u00f6nyv\u00e9re. S b\u00e1r „csak” mikr\u00f3b\u00e1kr\u00f3l van sz\u00f3, azok szolid sz\u00e1zmilli\u00f3 \u00e9vvel id\u0151sebbek mint a dinoszauruszok.
\nRussell Vreeland ugyanis azt tal\u00e1lta ki, hogy 200 milli\u00f3 \u00e9ves, \u00faj-mexik\u00f3i s\u00f3krist\u00e1lyokba z\u00e1rt v\u00edzcseppekb\u0151l pr\u00f3b\u00e1l meg bakt\u00e9riumokat izol\u00e1lni, s \u00fagy t\u0171nik mindez \u00f6ssze is j\u00f6tt neki. (Itt nyilatkozgat egy BBC Four filmben<\/a>.) Az izol\u00e1lt t\u00f6rzs, amelynek sp\u00f3r\u00e1i ott lap\u00edtottak id\u0151tlen id\u0151k \u00f3ta a krist\u00e1lyban, a rendk\u00edv\u00fcl szellemes „2-9-3” n\u00e9vre hallgat s puszta l\u00e9t\u00e9n k\u00edv\u00fcl m\u00e9g tartogatott meglepet\u00e9seket. Ugyanis meglep\u0151en hasonl\u00f3nak bizonyult egy, 63 \u00e9ve a Holt-tenger k\u00f6rny\u00e9k\u00e9n izol\u00e1lt extremofil, s\u00f3kedvel\u0151 baci t\u00f6rzsh\u00f6z, a Salibacillus marismortui<\/i>-hoz. Oly annyira, hogy b\u00e1r a zs\u00edrsavak \u00e9s a DNS szintj\u00e9n jelent\u0151s k\u00fcl\u00f6nbs\u00e9geket mutat a k\u00e9t izol\u00e1tum, az\u00e9rt annyit m\u00e9gsem, hogy teljesen egy\u00e9rtelm\u0171en k\u00fcl\u00f6n fajnak lehessen nevezni \u0151ket (a faj fogalom a mikrobiol\u00f3gi\u00e1ban k\u00fcl\u00f6n\u00f6sen m\u0171vi defin\u00edci\u00f3 egy\u00e9bk\u00e9nt). Ez persze m\u00e1ig tart\u00f3 k\u00e9shegyre men\u0151 vit\u00e1t robbantott ki, miszerint lehets\u00e9ges-e, hogy a) a sok \u00f3vint\u00e9zked\u00e9s ellen\u00e9re, vagy m\u00e1s okokb\u00f3l Vreeland\u00e9k mint\u00e1ja nem 200 milli\u00f3 \u00e9ves, hanem fiatalabb szennyez\u0151d\u00e9sb\u0151l \u00e1ll; vagy b) a s\u00f3krist\u00e1lyok kitermel\u00e9si hely\u00e9n \u00e1tfoly\u00f3 foly\u00f3 nemr\u00e9g m\u00e1r „kiszabad\u00edtott” hasonl\u00f3 \u0151sbacikat \u00e9s azok jutottak el a Holt-tengerig, vagy c) az extremofil bakt\u00e9riumok term\u00e9szetes mut\u00e1ci\u00f3s r\u00e1t\u00e1ja viszonylag \u00e1lland\u00f3 k\u00f6r\u00fclm\u00e9nyek k\u00f6z\u00f6tt nagyon alacsony. Vreeland\u00e9k szerint a szennyez\u0151d\u00e9s es\u00e9lye egy a milli\u00f3hoz, de kritikusaikat m\u00e9g nem gy\u0151zt\u00e9k meg teljesen.
\n
\nA h\u00edrecsk\u00e9re nyenyec<\/b> kart\u00e1cs h\u00edvta fel a figyelmemet, ezer k\u00f6sz\u00f6net \u00e9rte.<\/p>\n

\n


\nVreeland RH, Rosenzweig WD, Powers DW.<\/b> (2000) Isolation of a 250 million-year-old halotolerant bacterium from a primary salt crystal. Nature<\/i> 407<\/b>: 897-900.
\nMaughan H, Birky CW Jr, Nicholson WL, Rosenzweig WD, Vreeland RH.<\/b> (2002) The paradox of the „ancient” bacterium which contains „modern” protein-coding genes. Mol Biol Evol.<\/i> 19(9)<\/b>: 1637-1639.
\nVreeland RH, Rosenzweig WD, Lowenstein T, Satterfield C, Ventosa A.<\/b> (2006) Fatty acid and DNA analyses of Permian bacteria isolated from ancient salt crystals reveal differences with their modern relatives. Extremophiles<\/i> 10(1)<\/b>: 71-78.
\n<\/font><\/p>\n","protected":false},"excerpt":{"rendered":"

Gondolom mindenki eml\u00e9kszik a Jurassic Park kezd\u0151 soraira, amikor a borosty\u00e1nk\u0151be ragadt sz\u00fanyogb\u00f3l izol\u00e1lj\u00e1k azt a v\u00e9rcseppet amib\u0151l azt\u00e1n szinte spont\u00e1n n\u00e9h\u00e1ny tucat din\u00f3 faj teljes genomi DNS-\u00e9t rekonstru\u00e1lj\u00e1k. El lehet vitatkozni azon, hogy a val\u00f3s\u00e1g jobb rendez\u0151-e mint Spielberg, … Egy kattint\u00e1s ide a folytat\u00e1shoz…. →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-5005393","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=\/wp\/v2\/posts\/5005393","targetHints":{"allow":["GET"]}}],"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=5005393"}],"version-history":[{"count":0,"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=\/wp\/v2\/posts\/5005393\/revisions"}],"wp:attachment":[{"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5005393"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5005393"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/criticalbiomass.hu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5005393"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}