{"id":44685,"date":"2011-09-01T16:10:56","date_gmt":"2011-09-01T13:10:56","guid":{"rendered":"https:\/\/bilimvegelecek.com.tr\/?p=44685"},"modified":"2020-06-04T16:16:47","modified_gmt":"2020-06-04T13:16:47","slug":"kuslarin-kokeni-hakkinda-yeni-teori-genisletilmis-iskelet-kaslari","status":"publish","type":"post","link":"https:\/\/bilimvegelecek.com.tr\/index.php\/2011\/09\/01\/kuslarin-kokeni-hakkinda-yeni-teori-genisletilmis-iskelet-kaslari","title":{"rendered":"Ku\u015flar\u0131n k\u00f6keni hakk\u0131nda yeni teori: Geni\u015fletilmi\u015f iskelet kaslar\u0131"},"content":{"rendered":"

Haz\u0131rlayan: Simin Ecem Y\u0131ld\u0131z<\/strong><\/p>\n

New York Medical Colloge\u2019de geli\u015fim biyolo\u011fu olan Stuart A. Newman, ku\u015flar\u0131n k\u00f6keniyle ilgili yeni bir teori \u00f6ne s\u00fcrd\u00fc. Ku\u015flar\u0131n k\u00f6keni, geleneksel olarak u\u00e7man\u0131n evrimine dayand\u0131r\u0131l\u0131yordu, fakat Newman iskelet kaslar\u0131n\u0131n geni\u015fletilmesinin, u\u00e7ma ve y\u00fczme gibi adaptif de\u011fi\u015fimlere olanak sa\u011flayan iki ayak \u00fcst\u00fcnde y\u00fckselme hareketinin temeli olabilece\u011fini d\u00fc\u015f\u00fcnd\u00fc. T\u00fcm bunlar\u0131n ortaya \u00e7\u0131kmas\u0131nda ise di\u011fer s\u0131cakkanl\u0131 hayvanlar\u0131n kendi enerjisini \u00fcretme yetene\u011fi i\u00e7in kritik \u00f6neme sahip bir genin kaybolu\u015fu yat\u0131yordu.<\/p>\n

Dr. Newman, uncopling protein-1 (UCP1)\u2019i kodlayan genin kaybolmas\u0131yla ilgili kan\u0131t\u0131 bulma yolunda, ku\u015flar\u0131n ve kertenkelelerin ortak atas\u0131yla ilgili olan eski \u00e7al\u0131\u015fmalar\u0131ndan yararland\u0131.<\/p>\n

Bu kay\u0131p genin \u00fcr\u00fcn\u00fc, yeni do\u011fan memelilerde hipotermiye kar\u015f\u0131 koruyuculuk sa\u011flayan ve \u0131s\u0131 \u00fcreten \u201ckahverengi ya\u011f\u201d dokusunun olu\u015fumunda elzemdir. \u201cU\u00e7man\u0131n ku\u015flar\u0131n evriminde itici g\u00fc\u00e7 oldu\u011fu senaryosunun aksine, kas geni\u015flemesi teorisi fonksiyonel olarak i\u015fleyen ara formlara ihtiya\u00e7 duymadan u\u00e7maya, y\u00fczmeye ve kanats\u0131zl\u0131\u011fa ge\u00e7i\u015fin oldu\u011funu s\u00f6yl\u00fcyor. Teori ayn\u0131 zamanda, deveku\u015fu ve penguenler gibi modern u\u00e7amayan ku\u015flar\u0131n ortak bir atadan gelmesi gerekti\u011fi fikrini de ortadan kald\u0131r\u0131yor. Buna g\u00f6re, non-avian (u\u00e7mayan) dinozorlar\u0131n yok olu\u015funun; dengeleyici \u0131s\u0131 \u00fcretimi mekanizmas\u0131ndaki hatal\u0131 evrime kar\u015f\u0131l\u0131k, UCP1\u2019in kaybolu\u015fundan kaynakland\u0131\u011f\u0131 ileri s\u00fcr\u00fclebilir.\u201d diyor ara\u015ft\u0131rmac\u0131.<\/p>\n

Bir h\u00fccre biyolojisi ve anatomi profes\u00f6r\u00fc olan Dr. Newman, canl\u0131 \u00e7e\u015fitlili\u011fi ve bu \u00e7e\u015fitlili\u011fin nas\u0131l olu\u015ftu\u011fu konusunda ara\u015ft\u0131rmalar yap\u0131yor. Bu kez biraz daha farkl\u0131 olsa da, \u00e7al\u0131\u015fmalar\u0131 tamam\u0131yla ku\u015f geli\u015fimi \u00fczerine. Kendisi termojenes, kas hiperplazisi ve ku\u015flar\u0131n k\u00f6keni \u00fczerine olan \u00e7al\u0131\u015fmalar\u0131n\u0131n yan\u0131 s\u0131ra paleontoloji, genetik ve ya\u011f fizyolojisi alanlar\u0131ndan da istifade ediyor.<\/p>\n","protected":false},"excerpt":{"rendered":"

Haz\u0131rlayan: Simin Ecem Y\u0131ld\u0131z New York Medical Colloge\u2019de geli\u015fim biyolo\u011fu olan Stuart A. Newman, ku\u015flar\u0131n k\u00f6keniyle ilgili yeni bir teori \u00f6ne s\u00fcrd\u00fc. Ku\u015flar\u0131n k\u00f6keni, geleneksel olarak u\u00e7man\u0131n evrimine dayand\u0131r\u0131l\u0131yordu, fakat Newman iskelet kaslar\u0131n\u0131n geni\u015fletilmesinin, u\u00e7ma ve y\u00fczme gibi adaptif de\u011fi\u015fimlere olanak sa\u011flayan iki ayak \u00fcst\u00fcnde y\u00fckselme hareketinin temeli olabilece\u011fini d\u00fc\u015f\u00fcnd\u00fc. T\u00fcm bunlar\u0131n ortaya \u00e7\u0131kmas\u0131nda ise […]<\/p>\n","protected":false},"author":429,"featured_media":44686,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[128,38,32],"tags":[200,5553,5275,1689,661],"class_list":["post-44685","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-91-sayi","category-dergi-sayilari","category-evrim","tag-evrim","tag-iskelet","tag-kas","tag-koken","tag-kuslar"],"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\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t