\n<\/p>\n
\u0130nsanl\u0131\u011f\u0131n en b\u00fcy\u00fck ba\u015far\u0131lar\u0131ndan biri olan uzay yolculu\u011fu, insan v\u00fccudundaki hayati h\u00fccrelere a\u011f\u0131r bir bedel \u00f6detiyor. <\/p>\n
Yeni bir ara\u015ft\u0131rmaya g\u00f6re, uzay g\u00f6revleri v\u00fccudun do\u011fal onar\u0131m sistemi i\u00e7in kritik \u00f6neme sahip k\u00f6k h\u00fccrelerin ya\u015flanma s\u00fcrecini h\u0131zland\u0131r\u0131yor.<\/p>\n
H\u00dcCRELER DAHA HIZLI YA\u015eLANIYOR<\/strong><\/p>\n California \u00dcniversitesi\u2019nden bir ekip, k\u00f6k h\u00fccreleri d\u00f6rt ikmal g\u00f6reviyle Uluslararas\u0131 Uzay<\/a> \u0130stasyonu\u2019na (ISS) g\u00f6nderdi.<\/p>\n California \u00dcniversitesi\u2019nden bir ekip, k\u00f6k h\u00fccreleri d\u00f6rt ikmal g\u00f6reviyle Uluslararas\u0131 Uzay \u0130stasyonu\u2019na (ISS) g\u00f6nderdi. <\/p>\n 32 ile 45 g\u00fcn aras\u0131nda s\u00fcren g\u00f6revlerin ard\u0131ndan yap\u0131lan analizlerde, h\u00fccrelerin sa\u011fl\u0131kl\u0131 yeni h\u00fccre \u00fcretme kapasitesini kaybetti\u011fi, DNA hasar\u0131na daha yatk\u0131n hale geldi\u011fi ve kromozom u\u00e7lar\u0131ndaki koruyucu kapaklar\u0131n k\u0131sald\u0131\u011f\u0131 g\u00f6r\u00fcld\u00fc.<\/p>\n Bu de\u011fi\u015fiklikler, h\u00fccresel d\u00fczeyde h\u0131zlanan ya\u015flanman\u0131n i\u015faretleri olarak de\u011ferlendirildi.<\/p>\n ASTRONOTLARDA \u015eA\u015eIRTAN DE\u011e\u0130\u015e\u0130M<\/strong><\/p>\n Bu etkiler, ge\u00e7ti\u011fimiz aylarda NASA astronotlar\u0131 Butch Wilmore ve Suni Williams\u2019\u0131n d\u00f6n\u00fc\u015f\u00fcyle g\u00f6zler \u00f6n\u00fcne serildi. Ba\u015flang\u0131\u00e7ta 8 g\u00fcn planlanan g\u00f6revleri, Boeing Starliner\u2019daki teknik sorunlar nedeniyle 286 g\u00fcne uzad\u0131.<\/p>\n D\u00fcnyaya d\u00f6nd\u00fcklerinde iki astronotun yorgun, zay\u0131f ve ya\u015fl\u0131 g\u00f6r\u00fcn\u00fcmleri dikkat \u00e7ekti. Williams\u2019\u0131n sa\u00e7lar\u0131n\u0131n belirgin bi\u00e7imde beyazlad\u0131\u011f\u0131 g\u00f6r\u00fcld\u00fc.<\/p>\n Yer\u00e7ekimsiz ortamda kas erimesi ve kemik kayb\u0131 ya\u015fayan astronotlar, ini\u015ften sonra y\u00fcr\u00fcyemedikleri i\u00e7in sedyelerle ta\u015f\u0131nd\u0131.<\/p>\n H\u00dcCRELERDE ENERJ\u0130 KR\u0130Z\u0130<\/strong><\/p>\n Yeni \u00e7al\u0131\u015fmada, k\u00f6k h\u00fccrelerin uzayda ola\u011fand\u0131\u015f\u0131 \u015fekilde fazla aktif oldu\u011fu belirlendi. Bu durum enerji rezervlerini t\u00fcketmelerine ve kendilerini yenileyemez hale gelmelerine yol a\u00e7t\u0131.<\/p>\n H\u00fccrelerde iltihaplanma ve mitokondri kaynakl\u0131 stres de g\u00f6zlendi. Ancak h\u00fccreler daha sonra gen\u00e7 ve sa\u011fl\u0131kl\u0131 bir ortama konuldu\u011funda baz\u0131 hasarlar\u0131n geri d\u00f6nd\u00fc\u011f\u00fc g\u00f6r\u00fcld\u00fc. <\/p>\n \u00d6NCEK\u0130 \u00c7ALI\u015eMALAR NE D\u0130YOR?<\/strong><\/p>\n NASA\u2019n\u0131n \u201c\u0130kizler Ara\u015ft\u0131rmas\u0131\u201dnda da benzer bulgular elde edilmi\u015fti. Astronot<\/a> Scott Kelly 340 g\u00fcn uzayda kal\u0131rken, ikizi Mark Kelly D\u00fcnya\u2019da ya\u015fam\u0131\u015ft\u0131. <\/p>\n \u00c7al\u0131\u015fmada gen ifadelerinde de\u011fi\u015fimler, telomer uzunluklar\u0131nda dalgalanmalar ve ba\u011f\u0131rsak mikrobiyomunda kaymalar tespit edilmi\u015fti. \u00c7o\u011fu etki D\u00fcnya\u2019ya d\u00f6n\u00fc\u015ften sonra normale d\u00f6nerken, baz\u0131 de\u011fi\u015fikliklerin kal\u0131c\u0131 olabilece\u011fi g\u00f6r\u00fclm\u00fc\u015ft\u00fc.<\/p>\n<\/div>\n