{"id":9828,"date":"2011-03-01T18:02:12","date_gmt":"2011-03-01T16:02:12","guid":{"rendered":"http:\/\/109.232.216.219\/~bilimvegelecek\/?p=9828"},"modified":"2017-05-21T18:08:03","modified_gmt":"2017-05-21T15:08:03","slug":"mini-deniz-avcisi-avindan-gen-calabiliyor","status":"publish","type":"post","link":"https:\/\/bilimvegelecek.com.tr\/index.php\/2011\/03\/01\/mini-deniz-avcisi-avindan-gen-calabiliyor","title":{"rendered":"Mini deniz avc\u0131s\u0131, av\u0131ndan gen \u00e7alabiliyor!"},"content":{"rendered":"

University of British Columbia\u2019daki (UBC) ara\u015ft\u0131rmac\u0131lar, ufak bir deniz canl\u0131s\u0131 \u00fczerinde yapt\u0131\u011f\u0131 \u00e7al\u0131\u015fmalar, bu canl\u0131n\u0131n olduk\u00e7a s\u0131ra d\u0131\u015f\u0131 bir hayatta kalma stratejisi uygulad\u0131\u011f\u0131n\u0131 g\u00f6sterdi.<\/p>\n

Nature Communications<\/em>\u2019da yay\u0131nlanan \u00e7al\u0131\u015fmada,\u00a0dinoflagellate\u00a0grubunda bulunan\u00a0Oxyrrhis marina<\/em>\u2019n\u0131n avc\u0131l\u0131k yeteneklerinin olduk\u00e7a geli\u015fmi\u015f oldu\u011funu, bu deniz canl\u0131s\u0131n\u0131n avlad\u0131\u011f\u0131 canl\u0131lardan\u00a0gen \u00e7alabildi\u011fini\u00a0g\u00f6steriyor.<\/p>\n

Ayn\u0131 zamanda \u00e7al\u0131\u015fmada da g\u00f6rev alan,\u00a0UBC\u00a0Botanik Profes\u00f6r\u00fc\u00a0Patrick Keeling\u00a0bu durumun olduk\u00e7a s\u0131ra d\u0131\u015f\u0131 oldu\u011fu belirterek, \u201c\u00d6n\u00fcm\u00fczde,\u00a0yatay gen transferinin\u00a0ya da uzaktan ili\u015fkili t\u00fcrler aras\u0131ndaki gen ge\u00e7i\u015finin olduk\u00e7a\u00a0ilgin\u00e7 bir \u00f6rne\u011fi\u00a0bulunuyor\u201d diyor.<\/p>\n

Yatay gen transferi, bir organizman\u0131n, ikinci bir organizmadan t\u00fcremeden, o ikinci organizmaya ait genetik malzeme edinmesini sa\u011flayan herhangi bir s\u00fcre\u00e7tir. Buna kar\u015f\u0131n, dikey transfer bir organizman\u0131n kendi atalar\u0131ndan (yani ebeveynlerinden) genetik malzeme edinmesidir.<\/p>\n

Keeling, ger\u00e7ekle\u015ftirdikleri ara\u015ft\u0131rmalar\u0131n\u0131 \u015f\u00f6yle \u00f6zetliyor: \u201c\u00c7al\u0131\u015fmam\u0131z, Oxyrrhis marina<\/em> t\u00fcr\u00fcn\u00fcn, genellikle deniz bakterilerinde bulunan ve fotosentezde g\u00f6revli bir geni, avlad\u0131\u011f\u0131 di\u011fer h\u00fccrelerden ald\u0131\u011f\u0131n\u0131 g\u00f6steriyor. \u0130\u015fin daha ilgin\u00e7 k\u0131sm\u0131, bu gen\u00a0rhodopsin\u00a0ad\u0131 verilen bir proteini kodluyor. Asl\u0131nda bir\u00a0fotoresept\u00f6r\u00a0olan bu protein,\u00a0\u0131\u015f\u0131\u011f\u0131n enerjiye d\u00f6n\u00fc\u015ft\u00fcr\u00fclmesinde\u00a0g\u00f6rev al\u0131yor.\u201d<\/p>\n

\"\"\u0130nsanlar\u0131n g\u00f6zlerinde\u00a0de rhodopsin\u2019e olduk\u00e7a benzeyen,\u00a0opsin\u00a0ad\u0131nda bir protein bulunuyor.\u00a0Opsin\u00a0proteinleri,\u00a0d\u00fc\u015f\u00fck \u0131\u015f\u0131k ko\u015fullar\u0131nda\u00a0g\u00f6rmemizi sa\u011flar. Ancak bakterilerdeki\u00a0rhodopsin\u2019in aksine enerji \u00fcretimi ger\u00e7ekle\u015ftirmezler.<\/p>\n

Keeling, bu durumun tam da \u201cNe yiyorsan\u0131z osunuz\u201d (you are what you eat) kavram\u0131n\u0131 a\u00e7\u0131klad\u0131\u011f\u0131n\u0131 belirtiyor. \u00c7\u00fcnk\u00fc\u00a0Oxyrrhis marina<\/em> bu yolla o kadar fazla\u00a0rhodopsin\u00a0\u00fcretimi ger\u00e7ekle\u015ftiriyor ki, t\u00fcm yap\u0131s\u0131,\u00a0rhodopsine \u00f6zg\u00fc pembe rengine\u00a0d\u00f6n\u00fc\u015febiliyor.\u00a0Keeling\u00a0bu s\u0131ra d\u0131\u015f\u0131 avc\u0131n\u0131n bu sebeple -bakterilerin yapt\u0131\u011f\u0131 gibi- rhodopsini kullanarak\u00a0\u0131\u015f\u0131ktan enerji elde etti\u011fini\u00a0ifade ederek, \u201cI\u015f\u0131ktan elde etti\u011fi bu enerjiyi, muhtemelen bu genin sahibi olan bakterileri sindirmekte kullan\u0131yor. Olduk\u00e7a d\u00fczg\u00fcn i\u015fleyen bir metabolik stratejisi olmal\u0131\u201d\u00a0diyor.<\/p>\n

Oxyrrhis marina<\/em>,\u00a0k\u0131z\u0131l gel-git\u2019lerden sorumlu olan deniz planktonlar\u0131 ailesinin bir \u00fcyesi. D\u00fcnyan\u0131n bir\u00e7ok yerinde, s\u0131\u011f sularda olduk\u00e7a g\u00f6r\u00fcl\u00fcyor. UBC\u2019nin ger\u00e7ekle\u015ftirdi\u011fi \u00e7al\u0131\u015fmada g\u00f6r\u00fcld\u00fc\u011f\u00fc gibi\u00a0s\u0131ra d\u0131\u015f\u0131 avc\u0131l\u0131k \u00f6zelliklerine\u00a0sahip olan bu t\u00fcr, ortamda yeterince\u00a0av olmad\u0131\u011f\u0131nda kendi t\u00fcr\u00fcndeki di\u011fer bireyleri de yiyebiliyor.<\/p>\n

K\u0131z\u0131l gelgit\u00a0(red tide), denizlerde bir ya da birden fazla fitoplankton t\u00fcr\u00fcn\u00fcn aniden art\u0131\u015f\u0131 sonucunda yo\u011funluklar\u0131n\u0131n artmas\u0131 sonucunda suyun renginin k\u0131rm\u0131z\u0131 yada kahverengi bir hal almas\u0131na verilen biyolojik bir do\u011fa olay\u0131d\u0131r.<\/p>\n

Keeling, \u201cBu canl\u0131, \u2018avc\u0131\u2019 terimini sonuna kadar hak ediyor. \u00d6yle ki,\u00a0kendisi kadar b\u00fcy\u00fck\u00a0h\u00fccreleri bile kolayl\u0131kla t\u00fcketebiliyor\u201d diyor ve\u00a0Oxyrrhis marina<\/em>\u2019n\u0131n olduk\u00e7a\u00a0zor \u00f6ld\u00fcr\u00fclen bir canl\u0131\u00a0oldu\u011funu ekliyor.<\/p>\n

 <\/p>\n

Kaynak<\/strong>: http:\/\/www.physorg.com\/news\/2011-02-single-cell-marine-predator-unique-survival.html<\/p>\n","protected":false},"excerpt":{"rendered":"

University of British Columbia\u2019daki (UBC) ara\u015ft\u0131rmac\u0131lar, ufak bir deniz canl\u0131s\u0131 \u00fczerinde yapt\u0131\u011f\u0131 \u00e7al\u0131\u015fmalar, bu canl\u0131n\u0131n olduk\u00e7a s\u0131ra d\u0131\u015f\u0131 bir hayatta kalma stratejisi uygulad\u0131\u011f\u0131n\u0131 g\u00f6sterdi. Nature Communications\u2019da yay\u0131nlanan \u00e7al\u0131\u015fmada,\u00a0dinoflagellate\u00a0grubunda bulunan\u00a0Oxyrrhis marina\u2019n\u0131n avc\u0131l\u0131k yeteneklerinin olduk\u00e7a geli\u015fmi\u015f oldu\u011funu, bu deniz canl\u0131s\u0131n\u0131n avlad\u0131\u011f\u0131 canl\u0131lardan\u00a0gen \u00e7alabildi\u011fini\u00a0g\u00f6steriyor. Ayn\u0131 zamanda \u00e7al\u0131\u015fmada da g\u00f6rev alan,\u00a0UBC\u00a0Botanik Profes\u00f6r\u00fc\u00a0Patrick Keeling\u00a0bu durumun olduk\u00e7a s\u0131ra d\u0131\u015f\u0131 oldu\u011fu belirterek, […]<\/p>\n","protected":false},"author":805,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[122,19],"tags":[],"class_list":["post-9828","post","type-post","status-publish","format-standard","hentry","category-85-sayi","category-bilim-gundemi"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t