Browsing by Subject "Origins"

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Open Access
Bio-nanohybrids of quantum dots and photoproteins facilitating strong nonradiative energy transfer
(Royal Society of Chemistry, 2013-05-21) Seker U.O.S.; Mutlugun, E.; Hernandez-Martinez, R. L.; Sharma, V. K.; Lesnyak, V.; Gaponik N.; Eychmuller, A.; Demir, Hilmi Volkan
Utilization of light is crucial for the life cycle of many organisms. Also, many organisms can create light by utilizing chemical energy emerged from biochemical reactions. Being the most important structural units of the organisms, proteins play a vital role in the formation of light in the form of bioluminescence. Such photoproteins have been isolated and identified for a long time; the exact mechanism of their bioluminescence is well established. Here we show a biomimetic approach to build a photoprotein based excitonic nanoassembly model system using colloidal quantum dots (QDs) for a new bioluminescent couple to be utilized in biotechnological and photonic applications. We concentrated on the formation mechanism of nanohybrids using a kinetic and thermodynamic approach. Finally we propose a biosensing scheme with an ON/OFF switch using the QD-GFP hybrid. The QD-GFP hybrid system promises strong exciton-exciton coupling between the protein and the quantum dot at a high efficiency level, possessing enhanced capabilities of light harvesting, which may bring new technological opportunities to mimic biophotonic events.
Open Access
The origins of the Cold War in the Middle East : the Turkish case
(2006) Çakal, Hüseyin
This thesis aims to analyze the “contribution” of Turkey to the origins of the Cold War in the Middle East. The main argument of this thesis, in this context, is that the immediate post war environment in the middle east did not resemble something different from the years-old strategic environment in the middle east, main characteristic of which is continuous great power rivalry for hegemony over the region. At this juncture Turkey’s contribution happened to be a catalyst in the deterioration of the pragmatist wartime partnership between the Soviet Union and the Western Allies. Turkish policy makers stressed the power and inevitability of Russian attack in the event of lack of British and American opposition. During the period concerned, in the Middle East, the danger to the security of the free world did arise not so much from the threat of direct Soviet military aggression. It mainly aroused from continuation of the unfavorable historical trends. Therefore, imperial rivalries and dynastic ambitions suffice to explain most part of the postwar situation in the Middle East and thereby gave enough clue for the origins of the Cold War in that part of the world.