{"id":7025,"date":"2017-01-18T12:34:18","date_gmt":"2017-01-18T09:34:18","guid":{"rendered":"https:\/\/bilimvegelecek.com.tr\/?p=7025"},"modified":"2018-02-12T11:41:02","modified_gmt":"2018-02-12T08:41:02","slug":"kehribar-icinde-cok-iyi-korunmus-bir-dinozor-kuyrugu-bulundu","status":"publish","type":"post","link":"https:\/\/bilimvegelecek.com.tr\/index.php\/2017\/01\/18\/kehribar-icinde-cok-iyi-korunmus-bir-dinozor-kuyrugu-bulundu","title":{"rendered":"Kehribar i\u00e7inde \u00e7ok iyi korunmu\u015f bir dinozor kuyru\u011fu bulundu"},"content":{"rendered":"

G\u00f6rsel a\u00e7\u0131klamas\u0131:<\/strong> Kuyru\u011fun ait oldu\u011fu dinozor, muhtemelen bir ser\u00e7e b\u00fcy\u00fckl\u00fc\u011f\u00fcndeydi. Cheung Chung-Tat\u2019\u0131n betimi.<\/p>\n

Myanmar\u2019da (Burma), t\u00fcyl\u00fc bir dinozora ait kuyruk par\u00e7as\u0131, kehribar i\u00e7inde m\u00fckemmel \u015fekilde korunmu\u015f halde bulundu. Bu e\u015fsiz bulu\u015f, 160 milyon y\u0131ldan uzun bir s\u00fcre yery\u00fcz\u00fcne h\u00e2kim olan dinozorlar\u0131n biyolojisinde yeni bir pencere a\u00e7arak, soyu t\u00fckenmi\u015f olan bu canl\u0131lar\u0131 ete kemi\u011fe b\u00fcr\u00fcnd\u00fcrmeye yard\u0131m edecek. \u00d6rne\u011fin incelenmesi, kuyru\u011fun \u00fcst k\u0131sm\u0131n\u0131n kahve-kestane renginde, alt k\u0131sm\u0131n\u0131n ise beyaz oldu\u011funu ortaya koydu.<\/p>\n

\"\"Current Biology<\/em> dergisinde yay\u0131mlanan makalenin yazarlar\u0131ndan, Kanada\u2019daki Royal Saskatchewan M\u00fczesi\u2019nden Ryan McKellar, \u201cilk kez kehribar i\u00e7inde korunmu\u015f dinozora ait bir madde bulundu\u011funu\u201d dile getirdi.<\/p>\n

Makalenin ba\u015fyazar\u0131, Pekin\u2019deki \u00c7in Yerbilimleri \u00dcniversitesi\u2019nden Lida Xing, Myanmar\u2019\u0131n Myitkina Kenti\u2019nde kehribar i\u00e7inde korunmu\u015f dikkat \u00e7ekici bir fosil g\u00f6rd\u00fc. 99 milyon ya\u015f\u0131nda olan kehribar, m\u00fccevher olarak kullan\u0131lmak \u00fczere parlat\u0131lm\u0131\u015ft\u0131 ve sat\u0131c\u0131s\u0131 i\u00e7indekinin bir t\u00fcr bitki oldu\u011funu d\u00fc\u015f\u00fcn\u00fcyordu. Ancak daha yak\u0131ndan incelendi\u011finde, a\u015fa\u011f\u0131 yukar\u0131 ser\u00e7e b\u00fcy\u00fckl\u00fc\u011f\u00fcnde t\u00fcyl\u00fc bir dinozorun kuyru\u011fu olabilece\u011fi fikri ortaya \u00e7\u0131kt\u0131. Lida Xing, \u00f6rne\u011fin izini, onu ilk ortaya \u00e7\u0131karan madenciye kadar s\u00fcrmeyi ba\u015fard\u0131.<\/p>\n

Dr. McKellar kuyru\u011fun incelenmesinin, bunun eski \u00e7a\u011flardan kalma bir ku\u015fa de\u011fil de t\u00fcyl\u00fc bir dinozora ait oldu\u011funu kesin olarak ortaya \u00e7\u0131kard\u0131\u011f\u0131n\u0131 s\u00f6yl\u00fcyor. \u201cKaynaktan emin olabildiklerini, \u00e7\u00fcnk\u00fc modern ku\u015flarda ve onlar\u0131n en yak\u0131n akrabalar\u0131nda oldu\u011fu gibi kuyru\u011fun omurgas\u0131n\u0131n bir pigostile kayna\u015f\u0131k olmad\u0131\u011f\u0131n\u0131\u201d bildiren McKellar, \u201caksine kuyruk uzun ve esnek, t\u00fcylerin damarlar\u0131 her iki yanda da a\u015fa\u011f\u0131 do\u011fru d\u00f6k\u00fcl\u00fcyor\u201d diyor. Dinozorda, daha sonra kehribar haline gelen a\u011fa\u00e7 re\u00e7inesiyle kapland\u0131\u011f\u0131 s\u0131rada h\u00e2l\u00e2 v\u00fccut s\u0131v\u0131lar\u0131n\u0131n bulundu\u011funa dair i\u015faretler oldu\u011funu belirtiyor. Bu, re\u00e7ineye d\u00fc\u015fen canl\u0131n\u0131n bu yap\u0131\u015fkan maddeye, hen\u00fcz canl\u0131yken yap\u0131\u015f\u0131p kald\u0131\u011f\u0131n\u0131 ortaya koyuyor.<\/p>\n

\"\"
Dinozor kuyru\u011fu, zarif detaylar\u0131yla korunmu\u015f.<\/figcaption><\/figure>\n

Makalenin bir di\u011fer yazar\u0131 Bristol \u00dcniversitesi\u2019nden Prof. Mike Benton ekliyor: \u201cDinozor kuyru\u011funun b\u00fct\u00fcn detaylar\u0131n\u0131, kemikler, et, deri ve t\u00fcyler, g\u00f6rmek ve bu k\u00fc\u00e7\u00fck canl\u0131n\u0131n re\u00e7ineye nas\u0131l yakalan\u0131p ve muhtemelen kurtulamad\u0131\u011f\u0131 i\u00e7in nas\u0131l \u00f6ld\u00fc\u011f\u00fcn\u00fc hayal etmek \u015fa\u015fk\u0131nl\u0131k verici.\u201d<\/p>\n

Kuyru\u011fun kehribar\u0131n y\u00fczeyine yak\u0131n k\u0131sm\u0131nda bulunan bir par\u00e7as\u0131n\u0131n kimyasal olarak incelenmesi, kandaki demir kal\u0131nt\u0131lar\u0131n\u0131n izlerini de ortaya koydu. Buluntular bu dinozorlarda t\u00fcylerin nas\u0131l s\u0131raland\u0131\u011f\u0131na da \u0131\u015f\u0131k tutuyor. \u00d6l\u00fc bedenlerin fosil haline gelmesi s\u00fcrecinde canl\u0131lar\u0131n \u00fc\u00e7 boyutlu g\u00f6r\u00fcnt\u00fcs\u00fc tortul kayalarda s\u0131k\u0131\u015ft\u0131r\u0131lm\u0131\u015f iki boyutlu hale d\u00f6n\u00fc\u015f\u00fcyor, b\u00f6ylece detaylar\u0131n \u00e7o\u011fu kaybedilmi\u015f oluyor. Bu t\u00fcylerde, modern ku\u015flarda bulunan, iyi geli\u015fmi\u015f merkezi bir kalem \u2013bir belkemi\u011fi- bulunmuyor. T\u00fcylerin yap\u0131s\u0131, modern t\u00fcylerde bulunan k\u0131llar ile onlar\u0131 bir arada tutan k\u00fc\u00e7\u00fck kancalar\u0131n, t\u00fcy\u00fcn merkezi omurgas\u0131ndan daha \u00f6nce olu\u015fmu\u015f oldu\u011funu ortaya koyuyor.<\/p>\n

\"\"
Kuyru\u011fun bilgisayarl\u0131 tomografi taramas\u0131, t\u00fcylerin kuyruk boyunca nas\u0131l eklendi\u011fini ortaya koyuyor.<\/figcaption><\/figure>\n

Kuyruk \u00f6rne\u011finin bulundu\u011fu kuzeydo\u011fu Myanmar\u2019daki Kachin Eyaleti, 2000 y\u0131ld\u0131r kehribar \u00fcretimi yap\u0131lan bir yer. Fakat b\u00f6lge, kal\u0131nt\u0131lar i\u00e7erisinde \u00e7ok say\u0131da b\u00f6cek bulundu\u011fu i\u00e7in, ge\u00e7ti\u011fimiz 20 y\u0131l boyunca daha \u00e7ok tarih\u00f6ncesi \u00e7a\u011flardan kalma eklembacakl\u0131lar \u00fczerine \u00e7al\u0131\u015fan biliminsanlar\u0131 i\u00e7in odak noktas\u0131 olmu\u015ftu.<\/p>\n

Dr. McKellar, \u201cDaha iri kehribar par\u00e7alar\u0131 \u00e7o\u011funlukla madeni \u00e7\u0131karma s\u00fcrecinde k\u0131r\u0131l\u0131yor. Kehribarlar\u0131 g\u00f6rebildi\u011fimiz zaman \u00e7o\u011funlukla m\u00fccevher haline d\u00f6n\u00fc\u015ft\u00fcr\u00fclm\u00fc\u015f oluyor. Ne kadar \u00f6rne\u011fin kaybedilmi\u015f oldu\u011funu asla bilemeyece\u011fiz\u201d diyor. \u201cE\u011fer b\u00fct\u00fcn bir \u00f6rnek bulabilmi\u015f olsayd\u0131k, \u00f6rne\u011fin t\u00fcylerin b\u00fct\u00fcn v\u00fccutta nas\u0131l s\u0131ralanm\u0131\u015f oldu\u011funu g\u00f6zlemleyebilirdik. Ya da genel olarak fosillerde korunmu\u015f halde bulunamayan yumu\u015fak doku t\u00fcylerini g\u00f6rebilirdik.\u201d T\u00fcyl\u00fc bir dinozorun di\u011fer par\u00e7alar\u0131, u\u00e7an bir canl\u0131 m\u0131, yoksa havada s\u00fcz\u00fclen bir canl\u0131 m\u0131 oldu\u011funu ortaya \u00e7\u0131karabilirdi. Dr. McKellar, \u201cB\u00f6lgede benzer ba\u015fka \u00f6rneklerin de bulunmu\u015f oldu\u011fu s\u00f6ylentisi dola\u015f\u0131yor. Bu \u00f6rnekler e\u011fer \u00f6zel koleksiyonlara giderse, bilim i\u00e7in kaybedilmi\u015fler demektir\u201d diyor.<\/p>\n

Londra Do\u011fa Tarihi M\u00fczesi\u2019nden Dr. Paul Barrett, bulunan \u00f6rne\u011fi \u201cg\u00fczel bir fosil\u201d olarak niteliyor ve \u201c\u00e7ok nadiren kehribar i\u00e7inde omurgal\u0131 hayvan bulundu\u011funu\u201d s\u00f6yl\u00fcyor. Barrett, \u201cDaha \u00f6nce de kehribar i\u00e7inde korunmu\u015f t\u00fcylere rastlam\u0131\u015ft\u0131k, fakat bu \u00f6rnekte yeni olan \u015fey, ilk kez bir mezozoik d\u00f6nem dinozorunun ya da ku\u015funun t\u00fcylerinin \u00fc\u00e7 boyutlu yap\u0131s\u0131n\u0131 g\u00f6stermesi. \u015eimdiye kadar elimize ge\u00e7en t\u00fcm t\u00fcyl\u00fc dinozor fosilleri ve mezozoik ku\u015f iskeletleri, anatomilerinin baz\u0131 \u00f6nemli \u00f6zelliklerinin gizlenmesine neden olacak \u015fekilde, iki boyutlu hale gelmi\u015fti.\u201d<\/p>\n

Ayn\u0131 b\u00f6lgede, ge\u00e7ti\u011fimiz aylarda, kehribar i\u00e7inde eski \u00e7a\u011flardan kalma ku\u015f kanatlar\u0131 da ke\u015ffedilmi\u015fti.<\/p>\n

– Orijinal makale:<\/strong> Current Biology<\/em>, https:\/\/goo.gl\/m5gJMy<\/p>\n","protected":false},"excerpt":{"rendered":"

G\u00f6rsel a\u00e7\u0131klamas\u0131: Kuyru\u011fun ait oldu\u011fu dinozor, muhtemelen bir ser\u00e7e b\u00fcy\u00fckl\u00fc\u011f\u00fcndeydi. Cheung Chung-Tat\u2019\u0131n betimi. Myanmar\u2019da (Burma), t\u00fcyl\u00fc bir dinozora ait kuyruk par\u00e7as\u0131, kehribar i\u00e7inde m\u00fckemmel \u015fekilde korunmu\u015f halde bulundu. Bu e\u015fsiz bulu\u015f, 160 milyon y\u0131ldan uzun bir s\u00fcre yery\u00fcz\u00fcne h\u00e2kim olan dinozorlar\u0131n biyolojisinde yeni bir pencere a\u00e7arak, soyu t\u00fckenmi\u015f olan bu canl\u0131lar\u0131 ete kemi\u011fe b\u00fcr\u00fcnd\u00fcrmeye yard\u0131m […]<\/p>\n","protected":false},"author":453,"featured_media":13205,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[192,19,21,32],"tags":[421,200,450],"class_list":["post-7025","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-155-sayi","category-bilim-gundemi","category-biyoloji","category-evrim","tag-dinozorlar","tag-evrim","tag-kehribar"],"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