{"id":39010,"date":"2019-12-14T03:20:58","date_gmt":"2019-12-14T00:20:58","guid":{"rendered":"https:\/\/bilimvegelecek.com.tr\/?p=39010"},"modified":"2019-12-13T13:15:33","modified_gmt":"2019-12-13T10:15:33","slug":"biliminsanlari-bir-turun-maksimum-omrunu-hesaplayabiliyor","status":"publish","type":"post","link":"https:\/\/bilimvegelecek.com.tr\/index.php\/2019\/12\/14\/biliminsanlari-bir-turun-maksimum-omrunu-hesaplayabiliyor","title":{"rendered":"Biliminsanlar\u0131, bir t\u00fcr\u00fcn maksimum \u00f6mr\u00fcn\u00fc hesaplayabiliyor"},"content":{"rendered":"

Ne zaman \u00f6lece\u011fini bilebilir misin? Bu soru her zaman varsay\u0131msal bir soru olarak kalm\u0131\u015ft\u0131. Yeni \u00e7al\u0131\u015fmada ise biliminsanlar\u0131, ya\u015fam s\u00fcresinin belirlenmesinde geneti\u011fin rol\u00fcne odaklan\u0131yor.<\/p>\n

Scientific Reports dergisinde yay\u0131mlanan \u00e7al\u0131\u015fmada yer alan ve Avusturalya\u2019da \u00e7al\u0131\u015fma y\u00fcr\u00fcten biliminsanlar\u0131, bir t\u00fcr\u00fcn ya\u015fam s\u00fcresinin ne kadar olaca\u011f\u0131n\u0131 belirlemek i\u00e7in yeni bir metot \u00fczerinde \u00e7al\u0131\u015ft\u0131. \u00c7al\u0131\u015fmada yer alan biliminsanlar\u0131ndan biri olan Ben Mayne, \u201cBir t\u00fcr\u00fcn do\u011fal \u00f6mr\u00fcn\u00fcn maksimum s\u0131n\u0131r\u0131n\u0131 tahmin etmek i\u00e7in DNA yap\u0131s\u0131na odakland\u0131k. Bu \u00e7al\u0131\u015fmaya g\u00f6re bir t\u00fcr\u00fcn genom dizilemesi yap\u0131lm\u0131\u015fsa, o t\u00fcr\u00fcn \u00f6m\u00fcr uzunlu\u011funu tahmin edebiliriz\u201d a\u00e7\u0131klamalar\u0131nda bulundu.<\/p>\n

Bu \u00e7al\u0131\u015fmada 252 omurgal\u0131 canl\u0131 t\u00fcr\u00fcn\u00fcn k\u0131sa genom par\u00e7alar\u0131ndan se\u00e7ilen 42 gen \u00fczerinde tarama yap\u0131ld\u0131. Belirli bir omurgal\u0131 canl\u0131 t\u00fcr\u00fcn\u00fcn \u00fcyelerinin ne kadar s\u00fcre ya\u015fayabileceklerinin tahmin edilebilmesi i\u00e7in ya\u015fam s\u00fcresi ile ili\u015fkilendirilen bu genler analiz edildi.<\/p>\n

Ara\u015ft\u0131rmaya kat\u0131lan biliminsanlar\u0131, soyu t\u00fckenmi\u015f olan t\u00fcrler ile h\u00e2lihaz\u0131rda ya\u015famlar\u0131n\u0131 s\u00fcrd\u00fcren t\u00fcrlerin evrimini ve ya\u015fad\u0131klar\u0131 \u00e7evreyi anlayabilmek ve ya\u015fam\u0131 tehdit alt\u0131nda bulunan t\u00fcrlerin korunmas\u0131 i\u00e7in \u00e7al\u0131\u015fma bulgular\u0131n\u0131n de\u011ferlendirilebilece\u011fini ifade ediyor. Mayne, \u201c\u015eimdiye kadar, \u00f6zellikle de vah\u015fi ya\u015fam alanlar\u0131nda ya\u015fayan canl\u0131lar\u0131n, denizlerde ya\u015fayan memelilerin ve \u00e7e\u015fitli bal\u0131k t\u00fcrlerinin ya\u015fam s\u00fcrelerinin tahmin edilmesi olduk\u00e7a zordu\u201d a\u00e7\u0131klamalar\u0131nda bulundu.<\/p>\n

\"\"
Canl\u0131lar\u0131n maksimum \u00f6m\u00fcr uzunlu\u011funun belirlenmesi i\u00e7in genetik alan\u0131nda \u00e7al\u0131\u015fmalar yap\u0131lmaktad\u0131r.<\/figcaption><\/figure>\n

Soyu t\u00fckenmi\u015f hayvanlar\u0131n \u00f6m\u00fcr uzunlu\u011fu i\u00e7in de ara\u015ft\u0131rma yapan biliminsanlar\u0131, modern Afrika filinin genom yap\u0131s\u0131n\u0131 analiz ederek soyu t\u00fckenmi\u015f mamut ve baz\u0131 fil t\u00fcrleri i\u00e7in \u00f6m\u00fcr uzunlu\u011funu tahmin edebildiler. Mayne \u00e7al\u0131\u015fmaya ili\u015fkin a\u00e7\u0131klamalar\u0131na devam ederek \u201c\u00c7al\u0131\u015fmada kullan\u0131lan metot ile birlikte bir kutup balinas\u0131n\u0131n maksimum \u00f6mr\u00fcn\u00fcn 268 y\u0131l oldu\u011funu ortaya \u00e7\u0131kard\u0131k. Bu, daha \u00f6nce tahmin edilenden 57 y\u0131l daha uzun. Ayn\u0131 \u015fekilde soyu t\u00fckenmi\u015f olan y\u00fcnl\u00fc mamutlar\u0131n maksimum \u00f6m\u00fcr uzunlu\u011funun 60 y\u0131l oldu\u011funu, soyu yak\u0131n zamanda t\u00fckenmi\u015f olan Pinta Adas\u0131\u2019n\u0131n dev kaplumba\u011falar\u0131n\u0131n 120 y\u0131l ya\u015fad\u0131klar\u0131n\u0131 ortaya \u00e7\u0131kard\u0131k\u201d dedi.<\/p>\n

\u0130nsanlar hakk\u0131nda da \u00e7al\u0131\u015fma y\u00fcr\u00fcten biliminsanlar\u0131, do\u011fal \u00f6mr\u00fcm\u00fcz\u00fcn azami olarak 38 y\u0131l oldu\u011funu kaydetti. Bu, modern insan\u0131n \u00f6m\u00fcr uzunlu\u011fu i\u00e7in yap\u0131lan tahminlere de uymaktad\u0131r. T\u0131p ve di\u011fer geli\u015fmeler d\u00fcnyan\u0131n pek \u00e7ok yerinde ya\u015fayan insanlar\u0131n \u00f6m\u00fcr uzunlu\u011funun uzamas\u0131na yol a\u00e7m\u0131\u015ft\u0131r. Biliminsanlar\u0131 \u00e7al\u0131\u015fma s\u0131ras\u0131nda \u015fempanzeleri referans alarak, Neandertallerin ve Denisova insan\u0131n\u0131n modern insanlara benzer bir bi\u00e7imde maksimum 37.8 y\u0131ll\u0131k \u00f6m\u00fcr uzunlu\u011funa sahip olduklar\u0131n\u0131 kaydetti.<\/p>\n

\u00c7al\u0131\u015fmada omurgal\u0131 canl\u0131lar\u0131n \u00f6m\u00fcr uzunluklar\u0131na ili\u015fkin ba\u015far\u0131l\u0131 sonu\u00e7lara ula\u015f\u0131l\u0131rken, omurgas\u0131z canl\u0131lar\u0131n \u00f6m\u00fcr uzunlu\u011fu i\u00e7in do\u011fru tahminler geli\u015ftirilemedi. Bu durumun temel nedeninin omurgal\u0131larda ya\u015f tahmini i\u00e7in kullan\u0131lan metodun omurgas\u0131zlarda etkin bir bi\u00e7imde kullan\u0131lamayacak olmas\u0131 g\u00f6sterilmekte.<\/p>\n

Mayne, \u00fczerinde \u00e7al\u0131\u015fma yap\u0131lan genlerin ya\u015flanma a\u00e7\u0131s\u0131ndan daha fazla ara\u015ft\u0131rmaya kap\u0131 a\u00e7abilece\u011fini ifade ederek \u201cBu genlerin ya\u015flanma \u00e7al\u0131\u015fmalar\u0131 i\u00e7in iyi hedefler olmas\u0131 muhtemeldir\u201d dedi.<\/p>\n

Kaynak:<\/strong> https:\/\/cosmosmagazine.com\/biology\/life-clock-ticking<\/p>\n","protected":false},"excerpt":{"rendered":"

Ne zaman \u00f6lece\u011fini bilebilir misin? Bu soru her zaman varsay\u0131msal bir soru olarak kalm\u0131\u015ft\u0131. Yeni \u00e7al\u0131\u015fmada ise biliminsanlar\u0131, ya\u015fam s\u00fcresinin belirlenmesinde geneti\u011fin rol\u00fcne odaklan\u0131yor. Scientific Reports dergisinde yay\u0131mlanan \u00e7al\u0131\u015fmada yer alan ve Avusturalya\u2019da \u00e7al\u0131\u015fma y\u00fcr\u00fcten biliminsanlar\u0131, bir t\u00fcr\u00fcn ya\u015fam s\u00fcresinin ne kadar olaca\u011f\u0131n\u0131 belirlemek i\u00e7in yeni bir metot \u00fczerinde \u00e7al\u0131\u015ft\u0131. \u00c7al\u0131\u015fmada yer alan biliminsanlar\u0131ndan biri […]<\/p>\n","protected":false},"author":1390,"featured_media":39013,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[19],"tags":[431,292,5662,2150,5663],"class_list":["post-39010","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bilim-gundemi","tag-gen","tag-genetik","tag-omur-uzunlugu","tag-omurgali-canlilar","tag-soyu-tukenmis-canlilar"],"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