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İtalya’nın Magna Graecia Üniversitesi’nde fizik profesörü olan Enzo Di Fabrizio, elektron mikroskobu kullanarak DNA’yı fotoğrafladı.</p> <p class="MsoNormal"><strong>DAHA ÖNCE DOLAYLI OLARAK GÖZLEMLENMİŞTİ</strong><br /> <br /> Bilim insanları, Di Fabrizio’nun elde ettiği başarının öncesinde, DNA’nın yapısını dolaylı olarak gözlemlemişti. Çift sarmal şeklindeki DNA yapısı, ilk olarak X-ray kristallografisi adı verilen yöntemle tespit edilmişti. Bu yöntemde, X-ray ışınlarının çarpmasının ardından nasıl yansıdığına bakılarak materyalin şekli çıkarılıyor.<br /> <br /> <img height="359" align="middle" width="590" alt="" src="/images/upload/1(185).jpg" /></p> <p class="MsoNormal"><b style="mso-bidi-font-weight:normal">DOĞAL YAPISI DA GÖRÜNTÜLENECEK</b></p> <p class="MsoNormal">NanoLetters dergisinde yayımlanan çalışmada, Di Fabrizio ve meslektaşları, DNA’nın saklı görüntüsünü ortaya çıkaracak yeni bir yönten geliştirerek, nano ölçekte su geçirmeyen silikon sütunlar inşa etti. Ardından silikona DNA zincirleri içeren bir solusyon döküldü. Su, hızla buharlaştı ve geride gerilmiş ip gibi duran DNA zincirleri kaldı.</p> <p class="MsoNormal">İtalyan bilim insanı, daha sonra silikon yatağındaki deliklerden elektron ışınları gönderdi ve moleküllerin yüksek çözünürlüklü görüntülerini elde etti. Görüntüleri elde edilen DNA zincirleri, bir çift sarmalın aksine, birbirine düğümlenmiş çok sayıda kordon gibi belirdi. Bunun nedeni olarak, elektron ışınlarının bir çift sarmalı veya tek bir sarmalı yok edebilecek güçte olması gösterildi.<br /> <br /> <img height="429" align="middle" width="590" alt="" src="/images/upload/2(158).jpg" /></p> <p class="MsoNormal">New Scientist’e konuşan Di Fabrizio, daha hassas bir donanım kullanarak, düşük enerjili elektonlarlar aydınlatma sağlayabileceklerini, böylece DNA’nın doğal yapısını bozmadan görebileceklerini ifade etti.</p> <p class="MsoNormal">Elde edilen başarı, bir gün DNA’nın (deoksiribonükleik asit) RNA’lar gibi diğer önemli yaşam bloklarıyla olan etkileşimini çok daha iyi gözlemlemeyi sağlayabilir. 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